JP2012024768A - Undercut processing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an undercut processing mechanism by which forming circle is shortened, assembly does not require much labor and time because constitution is simple, cost reduction is attained, the request of space saving is responsible because the mechanism is compactly constituted and, particularly, press working by which a formed goods are recessed to the insides facing to each other is simultaneously performed.SOLUTION: In the undercut processing mechanism in which a die 10 on a receiving side, which is inserted into a tubular base stock 1 on press working is made to be able to take out outside the tubular base stock 1 after performing the press working for recessing both wall surfaces of the tubular base stock 1 to the insides facing to each other, the die 10 on the receiving side is divided into three in the thickness direction which is orthogonally crossed with the axial direction of the tube in the opening on the one end side of the tubular base stock 1 and includes a pair of holding parts 11, 12 which are inserted from the opening on the one end side into the tubular base stock 1 and by which the portions 2 to be worked of both the wall surfaces are supported from the inside and an intermediate portion 13 which is put in between the respective holding parts 11, 12 and makes the respective holding parts 11, 12 approach and separate each other in the thickness direction.

Description

  The present invention relates to a receiving die that has been inserted into a tubular material at the time of pressing after the press working is performed to dent the both sides of the tubular material as a press-molded product inwardly facing each other. The present invention relates to an undercut processing mechanism that can be taken out of a tubular material. Here, the press processing particularly corresponds to burring processing or the like.

  Conventionally, for example, a burring apparatus is known as this type of press molding apparatus. In other words, it is a processing device that forms a flange at the edge of the hole, and normally, a burring punch having an outer diameter larger than the inner diameter of the prepared hole is pushed into a prepared hole that has been previously drilled in a metal material, and the edge of the prepared hole is expanded. The flange is formed.

  In such a burring apparatus, the work part is distorted due to the pressing force during the drilling operation for drilling the pilot hole in the work part of the metal material and the urging force or lifting force due to the burring punch during the burring process. In order to prevent these problems, ingenuity has been made to drill holes and burring with a die (receiving die) placed inside the metal workpiece. .

  However, the metal material is not a plate-like material but a tubular shape having a closed cross section, and particularly when one end is closed or one end is bent, the following problems have occurred. That is, when burring is performed so as to face the inside of the pipe material, the punch receiving die (hereinafter referred to as a die) inserted in the pipe interferes with the burring shape, and the die is removed from the pipe. There was a problem that could not.

  As a conventional technique capable of solving such a problem, for example, an apparatus using a hydroform described in Patent Document 1 is known. That is, a perforating means for perforating a part of a metal tube and a split mold having a cylindrical shoulder and a convex outer portion around the perforating means are incorporated in the hydroform mold, and an internal pressure is applied to the metal tube. After carrying out hydroform processing by loading, after punching a part of the metal tube by the punching means, the periphery of the drilled hole is pushed into the inner surface side of the metal tube by the shoulder, and burring is performed on the inner surface side It is.

  Similarly, as a conventional technique capable of solving the above-described problem, a burring apparatus using a nesting and a steel ball described in Patent Document 2 is known. That is, after a jig having an inclined portion is inserted into the inside of a metal tube in which a pilot hole is formed, and the jig and the metal tube are fixed by aligning the inclined portion of the jig with the position of the pilot hole This is a device that performs burring by pushing a steel ball having a diameter larger than that of the pilot hole to the inclined portion inside the metal pipe, thereby pushing the steel ball from the position of the pilot hole to the outside of the metal pipe.

JP 2005-297060 A Japanese Patent Laid-Open No. 08-197151

  However, the conventional technique described in Patent Document 1 as described above has a problem that a molding cycle is long and a long time is required for processing. In addition, there is a problem that the punch press-in mechanism including the punching means and the convex shoulder becomes complicated and expensive, resulting in high cost. In addition, special equipment for generating high pressure is required, and the entire apparatus is large and expensive, which is not suitable for general use.

  In addition, the conventional technique described in Patent Document 2 as described above has a problem that the molding cycle is long as described above and a long time is required for processing. Moreover, there existed a problem that it was impossible to shape | mold simultaneously in several places. Furthermore, there is a problem that only a burring shape protruding outside the metal tube can be formed.

  The present invention has been made by paying attention to the problems of the conventional techniques as described above, and requires only a short molding cycle, is simple in construction, requires less labor and time for assembly, and realizes cost reduction. Provided is an undercut processing mechanism that can be compactly configured and meet the demand for space saving, and in particular, can simultaneously perform pressing that is recessed opposite to the inside of a molded product. The purpose is that.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] After pressing the tubular material (1) as a press-formed product, the both wall surfaces are recessed inwardly facing each other, and then inserted into the tubular material (1) at the time of the pressing. An undercut processing mechanism that enables the receiving side mold (10) to be taken out of the tubular material (1),
The receiving side mold (10) is divided into three in the thickness direction perpendicular to the tube axis direction in the one end side opening of the tubular material (1), and is inserted into the tubular material (1) from the one end side opening. A pair of holding parts (11, 12) that support the processed parts (2) of both wall surfaces from the inside, and an intermediate part (13) sandwiched between the holding parts (11, 12),
The holding parts (11, 12) are spaced apart from each other in the thickness direction and are in contact with the processed part (2), and are separated from the processed part (2) close to each other in the thickness direction. To the escape position to be moved,
The intermediate portion (13) is supported between the holding portions (11, 12) so as to be movable in the tube axis direction, and the holding portions (11, 11) are moved into the holding portions (11, 12). , 12) is driven to the support position, and each holding portion (11, 12) is driven to the escape position when the holding portions (11, 12) are retreated. mechanism.

[2] The receiving mold (10) is inserted into the tubular material (1) in a state of extending from a stopper (20) that is brought into contact with the opening on the one end side of the tubular material (1). ,
Each holding portion (11, 12) is supported by the stopper (20) at one end side so as to be movable between the support position and the escape position,
The undercut processing mechanism according to [1], wherein the intermediate portion (13) is supported so as to be drivable in the direction of the tube axis that advances and retracts from the stopper (20).

  [3] The driving means (250) and the stopper (20) of the intermediate portion (13) are formed as an integral unit, and the unit is mounted on the processing table (260) so as to be reciprocally movable in the tube axis direction. The undercut processing mechanism according to [1] or [2].

  [4] The outer surface of each of the holding portions (11, 12) is formed in a shape suitable for the processed portions (2) of the both wall surfaces facing each other [1], [2] Or the undercut processing mechanism as described in [3].

  [5] Both sides of the intermediate portion (13) are tapered to increase the distance between the holding portions (11, 12) as they enter between the holding portions (11, 12). The undercut processing mechanism according to [1], [2], [3] or [4].

  [6] The inner surface of each holding part (11, 12) and the tapered surface of the intermediate part (13) between them can move relative to each other along the advancing / retreating direction of the intermediate part (13). The undercut processing mechanism according to [5], wherein the undercut processing mechanism is connected to the undercut processing mechanism.

  [7] Guide means for guiding one end side of each holding portion (11, 12) into the stopper (20) in a direction crossing the advancing / retreating direction of the intermediate portion (13) and approaching or separating from each other. The undercut processing mechanism according to [1], [2], [3], [4], [5] or [6], wherein (22, 23) is provided.

  [8] The pressed object, which is processed by the undercut mechanism described in [1], [2], [3], [4], [5], [6] or [7] Molding.

The present invention operates as follows.
According to the undercut processing mechanism described in [1] above, before the predetermined pressing process is performed on the tubular material (1), the receiving side mold (10) is inserted into the tubular material from the one end side opening of the tubular material (1). (1) Insert into the inside, but at the time of this insertion, the intermediate part (13) of the receiving side mold (10) is retracted from between the pair of holding parts (11, 12), and each holding part (11, 12) is inserted. ) Are moved to escape positions close to each other in the thickness direction.

  After inserting the receiving side mold (10) into the tubular material (1), the intermediate part (13) of the receiving side mold (10) is inserted between the pair of holding parts (11, 12), thereby The holding parts (11, 12) are spaced apart from each other in the thickness direction, and are held at a supporting position where they contact the processed part (2) of the tubular material (1) from the inside. In such a state, the workpieces (2) on both wall surfaces of the tubular material (1) are simultaneously pressed from the outside, and the both wall surfaces are pressed inward. Here, both wall surfaces of the tubular material (1) may be upper and lower wall surfaces or both wall surfaces.

  At the time of pressing, the processed parts (2) on both wall surfaces of the tubular material (1) are supported from the inside by the respective holding parts (11, 12) as long as the processing is not hindered. Thereby, there is no possibility that the periphery of the processed part (2) will be excessively bent inward and deformed with the press working, and distortion and deformation around the processed part (2) can be prevented.

  After press working, the holding part (11, 12) is brought close to each other in the thickness direction by retracting the intermediate part (13) of the receiving mold (10) from between the pair of holding parts (11, 12). Thus, the tubular material (1) is displaced to the escape position where it is separated from the workpiece (2). Thereby, a receiving side metal mold | die (10) can be easily taken out out of a tubular material (1), without being caught in a to-be-processed part (2) within a tubular material (1).

  According to the undercut processing mechanism described in [2] above, the receiving side mold (10) extends in a state of extending from the stopper (20) that comes into contact with the one end side opening of the tubular material (1). (1) Insert in. Here, one end side of each holding part (11, 12) is supported by the stopper (20) so as to be movable between a support position and a relief position. The intermediate portion (13) is supported so as to be drivable in the direction of the tube axis that advances and retracts from the stopper (20). With such a configuration, the receiving mold (10) can be positioned at an appropriate position in the tubular material (1) by the stopper (20).

  According to the undercut processing mechanism described in [3], the driving means (250) of the intermediate portion (13) and the stopper (20) are formed as an integral unit, and the unit is formed as the tubular material (1). Is mounted on the processing table (260) so as to be reciprocally movable in the tube axis direction. Thus, the receiving mold (10) can be easily moved by moving the receiving mold (10) on the processing table (260) together with the stopper (20) and the driving means (250) of the intermediate portion (13). Can be inserted into the positioned tubular material (1) or taken out of the tubular material (1).

  According to the undercut processing mechanism described in [4], the outer surfaces of the holding portions (11, 12) of the receiving mold (10) are formed on both wall surfaces of the tubular material (1) facing each other. It is formed in a shape that fits the workpiece (2). Thereby, the required functional shape of the processed part (2) can be obtained without causing the holding parts (11, 12) to be distorted or deformed with respect to the processed part (2) during press working. .

  According to the undercut processing mechanism described in [5], the both sides of the intermediate part (13) of the receiving mold (10) are moved between the holding parts (11, 12). The taper which extends the distance between each holding | maintenance part (11,12) is attached. With such a simple configuration, only by moving the intermediate portion (13) forward and backward between the holding portions (11, 12), the supporting positions separating the holding portions (11, 12) and the escape positions approaching each other. Can be moved to.

  According to the undercut processing mechanism described in [6], the inner surface of each holding portion (11, 12) of the receiving mold (10) and the taper surface of the intermediate portion (13) between them. The intermediate portion (13) is connected to be movable relative to each other along the advancing / retreating direction. With such a simple configuration, the intermediate portion (13) can be guided so as to smoothly advance and retract between the holding portions (11, 12).

  According to the undercut processing mechanism described in [7] above, one end side of each holding portion (11, 12) is crossed with the advancing / retreating direction of the intermediate portion (13) in the stopper (20). , Guide means (22, 23) for guiding in directions close to or away from each other are provided. As a result, as the intermediate portion (13) is advanced and retracted between the holding portions (11, 12), the holding portions (11, 12) are surely moved to the support positions that are separated from each other and the escape positions that are close to each other. I can guide you.

  According to the undercut processing mechanism according to the present invention, after performing press working to dent both wall surfaces of the tubular material inwardly facing each other, the receiving side mold inserted into the tubular material at the time of the pressing is tubular. Can be easily taken out of the material, has a short molding cycle, has a simple configuration, requires less labor and time for assembly, can reduce costs, and can be compactly configured to save space. It is possible to respond to the request for conversion.

It is sectional drawing which shows the principle of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is a perspective view which shows the assembly process of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the mechanism of operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement centering on operation | movement of the receiving side metal mold | die of the undercut process mechanism which concerns on 1st Embodiment of this invention. It is a perspective view which shows the assembly process of the receiving side metal mold | die of the undercut process mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the receiving side metal mold | die of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is a perspective view which shows operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the tubular raw material which carries out a burring process with the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention. It is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism which concerns on 3rd Embodiment of this invention.

Hereinafter, various embodiments representing the present invention will be described with reference to the drawings.
1 to 8 show a first embodiment of the present invention.
FIG. 1 is a cross-sectional view showing the principle of a receiving mold that is a main part of an undercut processing mechanism. FIG. 2 is a perspective view showing the assembly process of the receiving mold. FIG. 3 is an explanatory diagram showing a mechanism of operation of the receiving mold. 4-8 is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism centering on operation | movement of a receiving side metal mold | die.

  The undercut processing mechanism was inserted into the tubular material 1 at the time of pressing after pressing the tubular material 1 as a press-molded product so as to dent both wall surfaces inwardly facing each other. The receiving mold 10 can be taken out of the tubular material 1. The tubular material 1 according to the first embodiment is a member having a rectangular cross section that is opened only at one end side and closed at the other end side. The case where burring processing is performed as press processing on the upper and lower wall surfaces, which are both wall surfaces of the tubular material 1, will be described below as an example.

  Opposite circular holes 2 are previously formed in the upper and lower walls of the tubular material 1 by general-purpose punching or the like. The burring process is to form flanges that protrude into the tubular material 1 simultaneously at the edges of the circular holes 2 on the upper and lower wall surfaces of the tubular material 1. As shown in FIG. 1, a pair of burring punches 3 that can approach the tubular material 1 from above and below are arranged, and each burring punch 3 is attached to a piston rod of a hydraulic cylinder (not shown).

  By driving the hydraulic cylinder, the tip of each burring punch 3 is forcibly inserted into the circular holes 2 on the upper and lower walls of the tubular material 1 from the outside, and at the same time, flanges 2 a facing inward are formed at the edges of the upper and lower circular holes 2. The At this time, the tubular material 1 is fixed by a jig or the like not shown. Here, since the configuration of the hydraulic cylinder and the like is common, detailed description is omitted. The specific material of the tubular material 1 may be any metal that can be pressed, such as aluminum or aluminum alloy.

  As shown in FIGS. 1 to 3, the receiving side mold 10 is divided into three in the thickness direction orthogonal to the tube axis direction in the one end side opening of the tubular material 1. The receiving die 10 divided into three parts is inserted into the tubular material 1 from one end side opening, and a pair of holding parts 11 and 12 for supporting the periphery of the circular hole 2 which is a processed part of the upper and lower wall surfaces from the inside, The intermediate portion 13 is sandwiched between the holding portions 11 and 12. Each holding part 11, 12 and the intermediate part 13 form a substantially cube-shaped die that matches the internal space of the tubular material 1 in a state of being overlapped in three stages.

  The upper and lower holding portions 11 and 12 are separated from each other in the thickness direction in the tubular material 1 and are separated from the circumference of the circular hole 2 close to each other in the thickness direction. Each escaping position is supported so as to be movable. The middle intermediate portion 13 is supported so as to be movable in the tube axis direction between the holding portions 11 and 12, and the holding portions 11 and 12 are driven to the support positions as they enter between the holding portions 11 and 12. On the other hand, each holding part 11, 12 is driven to the escape position with the withdrawal from between each holding part 11, 12.

  The receiving side mold 10 is inserted into the tubular material 1 in a state of extending from the stopper 20 that is brought into contact with the one end side opening of the tubular material 1. As shown in FIG. 3, each holding portion 11, 12 is supported by the stopper 20 at one end side so as to be movable in the vertical direction between the support position and the escape position. More specifically, base end portions 14 and 15 are integrally formed on one end sides of the holding portions 11 and 12 so as to abut the stoppers 20 and the openings on the one end side of the tubular material 1 to serve as stoppers.

  Each of the base end portions 14 and 15 is formed in a cubic shape projecting left and right at one end side of each of the holding portions 11 and 12, and is supported between the stoppers 20 so as to be movable in the vertical direction. The stopper 20 is composed of a pair of plate materials 21 and 21 facing left and right. On the inner surface of each plate member 21, guide means for guiding the base end portions 14 and 15 of the holding portions 11 and 12 so as to be movable in the vertical direction is provided. The guide means includes a pair of concave grooves 22 and 22 corresponding to the upper holding portion 11 and a pair of concave grooves 23 and 23 corresponding to the lower holding portion 12.

  On both side end surfaces of the base end portion 14 of the upper holding portion 11, a pair of ridges 16, 16 that slidably fit into the respective concave grooves 22 are projected. A pair of ridges 17, 17 that slidably fit into the respective concave grooves 23 are also provided on both side end surfaces of the base end portion 15 of the lower holding portion 12. Here, the ridges 16 and 17 may be provided on either the stopper 20 or the holding portions 11 and 12, and the concave grooves 22 and 23 are provided on either one of them. In short, any structure may be used as long as the holding portions 11 and 12 are guided in directions close to or away from each other, and the one provided on the stopper 20 side corresponds to the guide means.

  Moreover, the outer surface of each holding | maintenance part 11 and 12, ie, the upper surface of the upper holding | maintenance part 11, and the lower surface of the lower holding | maintenance part 12, fit each circumference | surroundings of the circular hole 2 of the up-and-down wall surface of the said tubular raw material 1. It is formed into a shape. As shown in detail in FIGS. 1 and 2, the flanges 2a and the burring punch 3 formed around the circular hole 2 are inserted into the outer surfaces of the holding portions 11 and 12 by the height of the flange 2a. Possible recesses 18 and 19 are formed.

  As shown in FIG. 3, the intermediate portion 13 of the receiving mold 10 is supported so as to be drivable in the direction of the tube axis that advances and retracts from the stopper 20. Although not shown in the present embodiment, as shown in a second embodiment to be described later, the base end portion of the intermediate portion 13 is attached to a piston rod 251 of a hydraulic cylinder 250 that is a driving means. By driving the hydraulic cylinder 250, the intermediate portion 13 moves in the tube axis direction while penetrating the stopper 20 and sandwiched between the holding portions 11 and 12, so that the tubular material 1 advances and retreats from the opening on the one end side. Is set to

  Moreover, the intermediate part 13 is formed in the taper cross-sectional shape from which the thickness becomes thin gradually toward the front-end | tip. Thus, the upper and lower surfaces of the intermediate portion 13 are tapered so as to increase the distance between the holding portions 11 and 12 as they enter between the holding portions 11 and 12. Furthermore, the taper surface of the intermediate portion 13 and the inner surfaces of the holding portions 11 and 12 are connected to each other so as to be relatively movable along the advancing / retreating direction of the intermediate portion 13.

  In detail, as shown in FIGS. 2 and 3, the upper and lower tapered surfaces of the intermediate portion 13 are respectively provided with protrusions 13 a and 13 b extending in the longitudinal direction at the center. On the other hand, dovetail grooves 11a and 12a, in which the protrusions 13a and 13b are slidably fitted, are provided on the inner surfaces of the holding portions 11 and 12 facing each other. Here, the ridges 13a and 13b fitted into the dovetail grooves 11a and 12a do not come out in the vertical direction intersecting these longitudinal directions. In addition, you may provide a dovetail groove | channel in the taper surface of the intermediate part 13, while providing a protrusion on the inner surface of each holding | maintenance part 11 and 12. FIG.

Next, the operation of the undercut processing mechanism according to the first embodiment will be described.
In order to assemble the receiving side mold 10, as shown in FIG. 2A, the holding portions 11 and 12 that face each other vertically are assembled between the pair of plate materials 21 and 21 of the stopper 20. That is, the pair of ridges 16, 16 on the base end portion 14 of the upper holding portion 11 are fitted into the pair of concave grooves 22, 22 on the inner surface upper side of each plate member 21. Similarly, the pair of ridges 17 and 17 on the base end portion 15 of the lower holding portion 12 are fitted into the pair of concave grooves 23 and 23 on the lower inner surface of each plate member 21. Here, each plate 21 is fixed to another member such as a mold.

  Subsequently, as shown in FIG. 2 (b), the intermediate portion 13 is inserted through the stopper 20 so as to be sandwiched between the holding portions 11 and 12. At this time, the ridge 13 a on the upper tapered surface of the intermediate portion 13 is fitted into the dovetail groove 11 a in the proximal end portion 14 of the upper holding portion 11. Further, the ridge 13 b on the lower tapered surface of the intermediate portion 13 is fitted into the dovetail groove 12 a in the proximal end portion 15 of the lower holding portion 12. Thereby, as shown in FIG.2 (c), the assembly of the receiving side metal mold | die 10 is completed. Although not shown, the base end portion of the intermediate portion 13 is attached to a piston rod 251 (see FIG. 13) of a hydraulic cylinder 250 that is a driving means.

  As shown in FIG. 3, the holding portions 11 and 12 of the receiving mold 10 are supported by stoppers 20 on the base end portions 14 and 15 so as to be movable between a support position and a relief position, respectively. As shown in FIG. 3A, the holding portion 12 moves in the vertical direction along the concave groove 23 of the plate material 21 in which the ridge 17 is fitted. Further, as shown in FIG. 3 (b), the intermediate portion 13 moves in the forward / backward direction along the dovetail groove 12a of the holding portion 12 with which the ridge 13b (see FIG. 3 (d)) is fitted.

  Both surfaces of the intermediate portion 13 are tapered so as to increase the distance between the holding portions 11 and 12 as they enter between the holding portions 11 and 12. Therefore, the holding portions 11 and 12 can be moved to the support positions that are separated from each other and the escape positions that are close to each other only by moving the intermediate portion 13 between the holding portions 11 and 12.

  As shown in FIG. 3 (c), when the intermediate portion 13 is pulled out in the left direction in the drawing, the holding portion 12 becomes the concave groove 23 of the stopper 20 and the ridge 13b of the intermediate portion 13 (see FIG. 3 (d)). The movement operation is forced along the line and moves upward in the figure. FIG. 3D shows a cross-sectional view in the direction of the arrow in FIG. With such a configuration, as the intermediate portion 13 is moved back and forth between the holding portions 11 and 12, the holding portions 11 and 12 are surely guided to the support positions that are separated from each other and the escape positions that are close to each other. Can do.

  Moreover, since the inner surface of each holding | maintenance part 11 and 12 and the taper surface of the intermediate part 13 are connected so that it can mutually move along the advancing / retreating direction of this intermediate part 13, each intermediate | middle part 13 is hold | maintained. It is possible to guide between the portions 11 and 12 so as to smoothly advance and retreat. The intermediate portion 13 is supported so as to be drivable in the front-rear direction (tube axis direction) that advances and retreats from the stopper 20. Further, the receiving side mold 10 can be positioned at an appropriate position in the tubular material 1 by the stopper 20, and the receiving side mold 10 can be collectively supported together with the stopper 20.

  Next, as shown in FIGS. 4 to 8, a molding operation process when the receiving mold 10 is incorporated in the mold will be described. In FIG. 4, the receiving side mold 10 is inserted into the tubular material 1 in the direction of the arrow a in a state of extending from the stopper 20 that contacts the one end side opening of the tubular material 1. At the time of this insertion, the intermediate part 13 is withdrawn from between the pair of holding parts 11 and 12, and the holding parts 11 and 12 are set to escape positions close to each other in the thickness direction.

  In FIG. 5, after the receiving mold 10 is inserted into the tubular material 1, the intermediate portion 13 is inserted between the pair of holding portions 11 and 12. Then, each holding | maintenance part 11 and 12 is spaced apart in the thickness direction, respectively, and is hold | maintained in the support position which contact | connects the circumference | surroundings of the circular hole 2 of the tubular raw material 1 from the inner side. At this time, the total thickness of the receiving side mold 10 matches the thickness of the inner dimension of the tubular material 1. FIG. 5B shows a cross-sectional view in the direction of the arrow in FIG.

  In FIG. 6, in a state where the holding portions 11 and 12 are held in the support position in the tubular material 1, the circular holes 2 on the upper and lower wall surfaces of the tubular material 1 are simultaneously pressed from the outside by the burring punch 3, Burring is performed to form the flange 2a with the edges projecting inward. At this time, the periphery of the circular hole 2 is supported from the inside by the holding portions 11 and 12 within a range in which the processing of the flange 2a is not hindered. Thereby, there is no possibility that the circumference of the circular hole 2 is excessively bent inward with the burring process, and the distortion and deformation around the circular hole 2 can be prevented. FIG. 6B shows a cross-sectional view in the direction of the arrow in FIG.

  In FIG. 7, after burring, the intermediate portion 13 is withdrawn from between the pair of holding portions 11, 12, so that the holding portions 11, 12 are brought close to each other in the thickness direction, and the processed portion 2 of the tubular material 1. Move to the escape position to leave more. As a result, the total thickness of the receiving mold 10 shrinks beyond the burring dimension. Therefore, as shown in FIG. 8, the receiving mold 10 can be easily taken out of the tubular material 1 without being caught by the flange 2 a in the tubular material 1. FIG. 7B shows a cross-sectional view in the direction of the arrow in FIG.

FIG. 9 shows a second embodiment of the present invention.
In the present embodiment, the basic configuration is the same as that of the receiving mold 10 according to the first embodiment described above, but there is no stopper 20 and the concave grooves 22 that guide the holding portions 11 and 12 in the vertical direction. 23, a pair of pin members 25 and 25 constitute a guide means. Although the stopper is not shown in FIG. 9, a member that supports each pin member 25 becomes a stopper together with the base end portions 14 and 15 of the holding portions 11 and 12.

  A pair of guide holes 26 are formed on both sides of the base end portion 14 of the upper holding portion 11 so as to penetrate in the vertical direction. Also, a pair of guide holes 27 are formed on both sides of the base end portion 15 of the lower holding portion 12 so as to penetrate in the vertical direction. The pin member 25 is supported by a stopper (not shown) in a state where the pin member 25 is inserted into the guide holes 26 and 27 so as to be relatively movable. In addition, in the surfaces where the upper and lower base end portions 15 and 16 are opposed to each other, concave portions 28 and 29 into which the distal end side of the intermediate portion 13 is respectively inserted are formed.

  As shown in FIG. 9A, the guide holes 26 and 27 of the holding portions 11 and 12 are passed through the pair of pin members 25 and 25 from above and below. Subsequently, as shown in FIG. 9 (b), the intermediate portion 13 is inserted into the state sandwiched between the holding portions 11 and 12 from the recesses 28 and 29 of the holding portions 11 and 12. Then, as shown in FIG.9 (c), the assembly of the receiving side metal mold | die 10 is completed. According to the receiving side mold 10 according to the second embodiment, the holding portions 11 and 12 are guided along the vertical direction which is the axial direction of the pin member 25 in the direction of approaching or separating from each other. Become. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.

10 to 17 show a third embodiment of the present invention.
In the present embodiment, the basic configuration is the same as that of the receiving mold 10 according to the first embodiment described above, but the entire apparatus of the undercut processing mechanism is illustrated, and as a pressed product The shape of the tubular material is different.

  FIG. 10 is an exploded perspective view showing a receiving mold that is a main part of the undercut processing mechanism. FIG. 11 is a perspective view showing the operation of the receiving mold. FIG. 12 is a perspective view showing the tubular material before and after processing. 13-17 is explanatory drawing which shows the process of the shaping | molding operation | movement of the undercut process mechanism centering on operation | movement of a receiving side metal mold | die.

  As shown in FIG. 12, the tubular material 5 according to the third embodiment is a member obtained by cutting an extruded material having a rectangular cross section (closed cross section) into a predetermined length and bending it at a predetermined angle at a substantially center thereof. It is. Ribs 6 projecting outward are formed on the upper and lower wall surfaces of the tubular material 5 so as to extend in the longitudinal direction. A circular hole 7 having a size on both side edges of the rib 6 is previously drilled at a position close to the one end side opening. Also in this embodiment, a case where burring processing is performed on the circular hole 7 as press processing will be described as an example.

  As shown in FIG. 10, the receiving die 100 has the same basic configuration as the receiving die 10 according to the first embodiment, and the tube axis direction at the one end side opening of the tubular material 5 It is divided into three in the thickness direction orthogonal to. The three-part receiving side mold 100 is inserted into the tubular material 5 from one end side opening, and a pair of holding parts 110 and 120 that support the periphery of the circular hole 7 that is a processed part of the upper and lower wall surfaces from the inside, The intermediate portion 130 is sandwiched between the holding portions 110 and 120.

  A pair of ridges 160, 160 that slidably fit into concave grooves 220 provided in the plate material 210 that constitutes the stopper 200 are projected from both end surfaces of the base end portion 140 of the upper holding portion 110. ing. In addition, a pair of ridges 170, 170 that slidably fit in the concave groove 220 are also provided on both end surfaces of the base end portion 150 of the lower holding portion 120.

  Further, the outer surfaces of the holding portions 110 and 120, that is, the upper surface of the upper holding portion 110 and the lower surface of the lower holding portion 120 are fitted around the circular holes 7 on the upper and lower wall surfaces of the tubular material 5 facing each other. It is formed into a shape. On the outer surface of each holding part 110, 120 is formed recesses 180, 190 into which the flange 7a formed around the circular hole 7 and the tip of the burring punch 3 can be inserted by a predetermined height of the flange 7a, respectively. Yes.

  As shown in FIG. 11, the intermediate part 130 of the receiving mold 100 is supported so as to be drivable in the tube axis direction that advances and retracts from the stopper 200. As will be described later, the base end portion of the intermediate portion 130 is attached to a piston rod 251 of a hydraulic cylinder 250 which is a driving means. By driving the hydraulic cylinder 250, the intermediate portion 130 moves in the tube axis direction while penetrating the stopper 200 and sandwiched between the holding portions 110 and 120, and advances and retreats from the opening on the one end side to the tubular material 5. Is set to

  In addition, the upper and lower tapered surfaces of the intermediate portion 130 and the inner surfaces of the holding portions 110 and 120 are connected to each other so as to be relatively movable along the advancing and retreating direction of the intermediate portion 130. In other words, the upper and lower tapered surfaces of the intermediate portion 130 are provided with protrusions 130a and 130b extending in the longitudinal direction at the center. On the other hand, dovetail grooves 110a and 120a into which the protruding strips 130a and 130b are slidably fitted are provided on the inner surfaces of the holding portions 110 and 120 facing each other. In addition, while providing a protruding item | line on the inner surface of each holding | maintenance part 110,120, you may provide a dovetail groove in the taper surface of the intermediate part 130. FIG.

  As shown in FIG. 13, the hydraulic cylinder 250, which is a driving means of the intermediate portion 130, and the stopper 200 are formed as an integral unit. A holder 252 is fixed to the front end of the hydraulic cylinder 250 where the piston rod 251 protrudes and retracts, and the stopper 200 is fixed to the tip of the holder 252. An intermediate portion 130 of the receiving mold 100 is attached to the tip of the piston rod 251.

  The unit is mounted on the processing table 260 so as to be able to reciprocate in a linear direction. The processing table 260 has a support surface 261 that is inclined in the same direction as the tube axis direction of the one end side opening of the tubular material 5 that is positioned at an inclination. The unit is mounted on the support surface 261 so as to be able to reciprocate in the tube axis direction of the tubular material 5. Thereby, the receiving mold 100 is easily inserted into the tubular material 5 or removed from the tubular material 5 by moving the receiving mold 100 together with the stopper 200 and the hydraulic cylinder 250 on the processing table 260. Can do.

  Next, as shown in FIGS. 13 to 17, a molding operation process of the receiving mold 100 will be described. In FIG. 13, the receiving mold 100 is inserted into the tubular material 5 in a state of extending from the stopper 200 that abuts against the opening on the one end side of the tubular material 5. At the time of this insertion, the intermediate part 130 is withdrawn from between the pair of holding parts 110 and 120, and the holding parts 110 and 120 are set to escape positions close to each other in the thickness direction.

  In FIG. 14, after the receiving mold 100 is inserted into the tubular material 5, the intermediate portion 130 is caused to enter between the pair of holding portions 110 and 120 by driving the hydraulic cylinder 250 in FIG. 15. Then, each holding | maintenance part 110,120 is spaced apart in the thickness direction, respectively, and is hold | maintained in the support position which contacts the circumference | surroundings of the circular hole 7 of the tubular raw material 5 from the inner side. At this time, the total thickness of the receiving-side mold 100 matches the thickness of the inner dimension of the tubular material 5.

  In FIG. 16, in a state where the holding portions 110 and 120 are held in the support position in the tubular material 5, the circular holes 7 on the upper and lower wall surfaces of the tubular material 5 are simultaneously pressed from the outside by the burring punch 3. Burring is performed to project the flange 7a (see FIG. 12) with the edges protruding inward. At this time, the circumference of the circular hole 7 is supported from the inside by the holding portions 110 and 120 within a range in which the processing of the flange 7a is not hindered.

  In FIG. 17, after the burring process, the intermediate portion 130 is retracted from between the pair of holding portions 110 and 120 by driving the hydraulic cylinder 250, so that the holding portions 110 and 120 are brought close to each other in the thickness direction. The material 5 is displaced to the escape position where it is separated from the circumference of the circular hole 7. As a result, the total thickness of the receiving mold 100 shrinks beyond the burring dimension and can be easily taken out of the tubular material 5.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and changes and additions may be made without departing from the scope of the present invention. It is included in the present invention. For example, the shapes of the tubular materials 1, 5 and the circular holes 2, 7 that are parts to be processed are not limited to those specifically illustrated. In addition, the press-formed product processed by the undercut processing mechanism is not limited to a closed cross-section material such as a tubular material 1 or 5, but a substantially C-shaped cross section or a substantially U-shaped cross section. Including other materials. Moreover, as long as at least one end side is opening the tubular raw material, the other end side may be closed.

  The undercut processing mechanism can be configured as a unit that is pre-installed in the mold, and it is possible to carry out burring processing facing the inside on both wall surfaces of the tubular material with high work efficiency and high efficiency. Suitable for applications and functions to mass-produce molded parts with high processing accuracy without distorting or deforming the workpiece parts.

DESCRIPTION OF SYMBOLS 1 ... Tubular material 2 ... Circular hole 2a ... Flange 3 ... Burring punch 5 ... Tubular material 6 ... Rib 7 ... Circular hole 10 ... Receiving side metal mold 11 ... Holding part 11a ... Dovetail groove 12 ... Holding part 12a ... Dovetail groove 13 ... Intermediate part 13a ... convex strip 13b ... convex strip 14 ... base end portion 15 ... base end portion 16 ... convex strip 17 ... convex strip 18 ... concave portion 19 ... concave portion 20 ... stopper 21 ... plate material 22 ... concave groove 23 ... concave groove 25 ... Pin member 27 ... guide hole 28 ... concave 29 ... concave 100 ... receiving side mold 110, 120 ... holding portion 130 ... intermediate portion 130a, 130b ... projection strip 140 ... base end portion 150 ... base end portion 160 ... projection strip 170 ... Convex ridge 180 ... Concavity 200 ... Stopper 220 ... Concave groove 250 ... Hydraulic cylinder 251 ... Piston rod 252 ... Holder 260 ... Work table 261 ... Support surface

Claims (8)

After pressing the tubular material as the product to be pressed, both wall surfaces are dented inwardly facing each other, and then the receiving mold inserted into the tubular material at the time of the pressing is removed from the tubular material. An undercut processing mechanism that can be taken out to
The receiving side mold is divided into three in the thickness direction perpendicular to the tube axis direction at the one end side opening of the tubular material, and is inserted into the tubular material from the one end side opening so that the processed parts of the both wall surfaces are inside. A pair of holding portions supported from the intermediate portion sandwiched between each holding portion,
The holding portions are movably supported at a support position where they are separated from each other in the thickness direction and come into contact with the processed portion, and at a clearance position where they are separated from the processed portion and close to each other in the thickness direction. And
The intermediate part is supported so as to be movable in the tube axis direction between the holding parts, and moves the holding parts to the support position as it enters between the holding parts. The undercut processing mechanism is characterized in that each holding portion is driven to the escape position with the withdrawal. The receiving side mold is inserted into the tubular material in a state of extending from a stopper to be brought into contact with the one end side opening of the tubular material,
Each holding portion is supported by the stopper at one end side so as to be movable to the support position and the escape position, respectively.
The undercut processing mechanism according to claim 1, wherein the intermediate portion is supported so as to be drivable in the direction of the tube axis that advances and retreats from the stopper.   The undercut according to claim 1 or 2, wherein the driving means and the stopper of the intermediate part are formed as an integral unit, and the unit is mounted on a processing table so as to be reciprocally movable in the tube axis direction. Processing mechanism.   4. The undercut processing mechanism according to claim 1, wherein an outer surface of each of the holding portions is formed in a shape that fits a processed portion of each of the wall surfaces facing each other.   5. The taper according to claim 1, 2, 3, or 4, wherein both surfaces of the intermediate portion are tapered to increase the distance between the holding portions as they enter between the holding portions. The undercut processing mechanism described.   The inner surface of each holding part and the tapered surface of the intermediate part between them are connected to each other so as to be movable relative to each other along the advancing / retreating direction of the intermediate part. The undercut processing mechanism described.   A guide means is provided in the stopper for guiding one end side of each holding portion in a direction that crosses the advancing and retreating direction of the intermediate portion and approaches or separates from each other. The undercut processing mechanism according to 3, 4, 5 or 6.   The said press-molded product processed by the undercut processing mechanism according to claim 1, 2, 3, 4, 5, 6 or 7.

Images