JP2007301616A - In-mold pitch fluctuation prevention device - Google Patents

Abstract

A belt-like material is prevented from being pulled by the weight of a loop during press working.
A belt-like material in which a plurality of protrusions formed in a line in the width direction of a member are arranged at a constant pitch in a member conveyance direction is obtained by a first press machine and a second press machine. Used in a press line in which a loop of band-shaped material is formed between the first press and the second press, which are sequentially pressed, and provided at the belt-shaped material conveyance outlet of the first press An in-mold pitch fluctuation preventing device having a plurality of teeth on the outer periphery at a pitch corresponding to the pitch of the protrusions with a tip portion that can be inserted into a gap between adjacent protrusions of the band-shaped material And a motor that is connected to the gear portion and performs a rotation operation and a holding operation in synchronization with the stamping operation of the first press machine, and the motor performs the holding operation to fix the belt-shaped material, The strip of material in the mold of the press 1 To cut off the pulling force by-flops.
[Selection] Figure 3

Description

  The present invention relates to an in-mold pitch fluctuation preventing apparatus, and more particularly to an in-mold pitch fluctuation preventing apparatus that prevents a band-shaped material from being pulled using a protrusion formed on a thin plate material.

  When forming a thin plate-like processed thin plate material (strip-shaped material) such as an aluminum plate by press working, a die called a progressive die is often used.

  A progressive mold is a process in which a plurality of steps are arranged in sequence at a predetermined pitch in the same mold, and a feed device feeds the material by a predetermined pitch for each stroke of the press machine, to the next process. An apparatus that feeds the belt-like material in sequence. The belt-shaped material is continuously supplied by a supply device, and processed products are sequentially discharged from the progressive die by continuous automatic operation.

  By using a progressive metal mold, it is possible to continuously process a press process having a complicated shape step by step.

  FIG. 4 is a diagram showing a configuration of a conventional press line. As shown in the figure, the conventional press line is composed of a molding press (progressive die) machine 3 and a punching press (separate) machine 4.

  The forming process by the forming press machine 3 and the punching process by the punching press machine 4 are different in the processing pitch of the band-shaped material 1, and after the forming process of the band-shaped material 1 by several to several tens of stampings by the forming press machine 3. Then, punching is performed by one stamping by the punching press 4. As described above, the molding press machine 3 and the punching press machine 4 are different in the processing pitch of the belt-like material 1, and therefore, by providing the loop 1 a between the molding press machine 3 and the punching press machine 4, It is necessary to take timing.

  Then, by providing a loop 1 a between the molding press 3 and the punching press 4, when the number of moldings of the molding press 3 is sufficient for the number of products, the belt-like material 1 is transferred to the punching press 4. Sent at the pitch and punched.

  As described above, the progressive die is a progressive feed method for preliminary bending, forming bending, etc., and correction processes such as height, warpage, and pitch. Therefore, when the strip-shaped material 1 formed by the weight of the loop 1a between the molding press 3 and the punching press 4 is pulled (direction A in the figure), it is difficult to process a predetermined position in the progressive die. It becomes.

Here, as a method for correcting the displacement of the press working position, a device for positioning a workpiece by providing a pilot hole for positioning in a band-shaped material and inserting a positioning pin provided in the processed portion into this hole is proposed. (For example, refer to Patent Document 1).
JP-A-5-245557

  However, when positioning with the pilot hole, if the positional deviation between the pilot hole of the workpiece and the positioning pin of the mold is large, the positioning pin cannot be inserted and the workpiece may be damaged. In particular, if the workpiece is thin, an excessive load is applied to the workpiece when the positioning pin is inserted, and the workpiece may be damaged.

  In addition, when the pilot hole is provided in the workpiece, a portion that cannot be pressed is generated on the workpiece, so that the material is wasted. And since a workpiece | work deform | transforms by press work, the positional relationship between a pilot hole and the shape of the processus | protrusion formed on the workpiece | work will also change according to the process step. Therefore, when the pilot hole is used as a reference for the processing position, the processing position is shifted in the positional relationship with the shape of the protrusion.

  In the first place, there is a product in which a pilot hole cannot be provided on a workpiece such as processing for forming an offset fin.

  An object of the present invention is to solve such a conventional problem, and by performing positioning using a protrusion shape formed on the band-shaped material, the band-shaped material is pulled during press working. It is an object of the present invention to provide an in-mold pitch fluctuation preventing device that can prevent this.

  The present invention provides a first press machine and a first press machine that convey a band-shaped material in which a plurality of protrusions formed in a line in the width direction of a member are arranged at a substantially constant pitch in a member conveyance direction in a certain direction. 2 is used in a press line in which a loop of a belt-like material is formed between the first press and the second press, and the belt-like material of the first press In the mold pitch fluctuation preventing device provided at the transfer outlet of the belt, a tooth portion having a tip portion that can be inserted into a gap between adjacent projecting portions of the band-shaped material at a pitch corresponding to the pitch of the projecting portion. There are a plurality of gears on the outer periphery, and a gear part that engages with the belt-like material with the tooth part protruding from the conveying surface of the belt-like material, and is connected to the gear part and rotates and holds in synchronization with the stamping operation of the first press. A motor that performs the holding operation. By fixing the material web to be meshed with the gear portion, characterized by blocking the loop by pulling force of the belt-like material to the first pressing machine comprises a mold.

  According to the in-mold pitch fluctuation preventing device of the present invention, it is possible to perform stable molding by preventing the strip-shaped material from being pulled during press working.

  Hereinafter, an in-mold pitch fluctuation preventing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In the press line according to the present embodiment, wave-shaped offset fins (projections) are formed on the belt-shaped material by a progressive die, and the outer shape is extracted to manufacture a final product.

  FIG. 1 is a diagram illustrating an example of a band-shaped material 1 on which offset fins 10 are formed. Here, the offset fin means a fin having a wave shape and having a peak and valley in the plate width direction shifted by a half mountain in the plate width direction at every predetermined pitch in the plate width direction. It is often used in heat exchangers such as oil coolers.

  As can be seen from FIG. 1, the offset fins 10 formed on the band-shaped material 1 are formed at a predetermined pitch P.

  FIG. 2 is a schematic configuration diagram of a press line having the in-mold pitch fluctuation preventing device of the present embodiment.

  Reference numeral 1 denotes a band-shaped material such as an aluminum plate or a stainless plate wound on a reel or the like. Reference numeral 2 denotes an unwinding device for stocking the belt-shaped material 1.

  The molding press 3 includes a molding die 3a that performs processing for forming offset fins on the belt-shaped material 1. The punching press 4 has a punching die 4a for punching the belt-shaped material 1. Between the molding press 3 and the punching press 4, a loop 1a of the belt-like material 1 is provided.

  In addition, the in-mold pitch fluctuation preventing device 5 of the present embodiment is provided between the discharge portion of the belt-shaped material 1 of the molding press 3 and the loop 1a.

  FIG. 3 is a configuration diagram of the in-mold pitch fluctuation preventing apparatus of the present embodiment. 3A is a plan view of the in-mold pitch fluctuation preventing apparatus of the present embodiment, and FIG. 3B is a front view of the in-mold pitch fluctuation preventing apparatus of the present embodiment. (C) is a side view of the in-mold pitch fluctuation preventing device of the present embodiment.

  The in-mold pitch fluctuation preventing device 5 according to the present embodiment includes a pair of gears 51, a shaft (rotating shaft) 54, and a motor 52. The shaft 54 is provided such that the central axis of the shaft 54 is orthogonal to the conveying direction of the band-shaped material 1. Further, a bearing built-in holder 55 is disposed near both ends of the shaft 54, and the shaft 54 is rotatably attached via the bearing built-in holder 55.

  A pair of gear portions 51 are fixed to the intermediate portion of the shaft 54 at a predetermined interval.

  Further, the gear 51 has a plurality of tooth portions 51a on the outer peripheral portion, and the tooth portions 51a protrude substantially from the conveying surface of the belt-shaped material 1 by the height of the tooth portions 51a, and the belt-shaped material 1 on the conveying surface. It fits in the gap 1c of the offset fin. The tooth portion 51a can be inserted into the gap 1c of the offset fin and comes into contact with the gap 1c with almost no play.

  The arrangement interval of the tooth portions 51a on the outer peripheral portion of the gear 51 is substantially the same as the pitch P of the protrusions of the offset fin shown in FIG.

  A motor 52 is connected to one end of the shaft 54 via a coupling 53 so that the driving force and holding force of the motor 52 can be transmitted to the gear 51.

  An intermediate bearing built-in holder 57 is provided at a substantially intermediate portion of the shaft 54 to prevent the shaft 54 from being bent by the load of the loop 1a.

  A work pressing plate 56 is provided at a position where the belt-like material 1 can be clamped by the gear 51, and the belt-like material 51a of the gear 51 and the belt-like shape present on the conveyance surface are being conveyed and fixed. The fitting of the offset fins 1c of the material 1 with the gap 1c is prevented from coming off.

  The bearing built-in holder 55, the intermediate bearing built-in holder 57, and the motor 52 are fixed to the base 58.

  Next, the operation of the in-mold pitch fluctuation preventing apparatus of this embodiment will be described. The strip-shaped material 1 is conveyed by a molding press 3 at a predetermined pitch (direction A in the figure). At this time, the gear portion 51 engaged with the belt-shaped material 1 rotates in synchronization with the conveyance of the belt-shaped material 1 (direction B in the drawing). At the time of conveyance, the motor 52 connected to the gear portion 51 rotates in synchronization with the conveyance speed of the band-shaped material 1, so that the reaction force from the gear portion 51 is hardly generated in the band-shaped material 1 and is formed in the band-shaped material 1. The offset fin 10 is not deformed by the load from the gear portion 51.

  When the pitch feed is completed, the motor 52 stops the rotation operation and performs the holding operation, and the gear portion 51 is fixed. And the strip | belt-shaped material 1 is fixed to a processing position. As the motor 52, a motor having a holding force when stopped, for example, a stepping motor or a motor with a brake may be used.

  As described above, according to the in-mold pitch fluctuation preventing device of the present embodiment, after the offset fin molding as described above, since the spring property is generated in the band-shaped material 1, the gap between the molding mold 3a and the loop 1a is increased. The force pulled by the weight of the mold is divided by the in-mold pitch fluctuation preventing device 5.

  As shown in FIG. 2, after molding by the molding press 3, a gear 51 connected to the motor 50 is provided, the tooth portion 51a is hooked on the offset fin 10, the motor 50 is rotated, and a predetermined position is reached at a predetermined timing. The belt-shaped material 1 is conveyed. The gear 51 feeds the formed band-shaped material 1 and fixes the band-shaped material 1 at a predetermined position to block the force pulled toward the loop 1a.

  Products with offset fins are widely used in automobiles as cooling fins for oil, exhaust gas, etc., and the pitch of offset fins is becoming increasingly narrower in order to increase cooling efficiency. The band-shaped material 1 formed with a large weight and a strong force to be pulled toward the loop 1a, making the forming process difficult, but according to this embodiment, a stable forming process can be performed.

  In addition, when fixing with the pilot hole, there is a possibility that the band-shaped material 1 is deformed due to the weight of the band-shaped material 1, but in this embodiment, the band-shaped material 1 is fixed by the offset fin itself. There is little risk of deformation of the band-shaped material 1.

It is a figure which shows an example of the strip | belt-shaped material in which the offset fin was formed. It is a schematic block diagram of the press line which has the die pitch fluctuation | variation prevention apparatus of this embodiment. It is a block diagram of the pitch variation prevention apparatus in a metal mold | die of this embodiment. It is a figure which shows the structure of the conventional press line.

Explanation of symbols

1: Strip material 3: Molding press 4: Punching press 5: In-mold pitch fluctuation prevention device 51: Gear portion 52: Motor 53: Coupling 54: Shaft 55: Bearing built-in holder 56: Work holding plate

Claims (1)

A first press machine and a second press machine, in which a plurality of protrusions formed in a row in the width direction of a member convey a belt-like material arranged at a substantially constant pitch in the member conveyance direction in a certain direction. Are used in a press line in which a loop of the belt-like material is formed between the first press machine and the second press machine, and the belt-like material of the first press machine. In-mold pitch fluctuation preventing device provided at the transfer outlet of
A plurality of teeth on the outer periphery having a tip corresponding to the pitch of the protrusions, and the teeth on the conveying surface of the band-like material; A gear portion that protrudes and meshes with the belt-like material,
A motor connected to the gear portion and performing a rotation operation and a holding operation in synchronization with a stamping operation of the first press machine;
With
When the motor performs a holding operation, the belt-shaped material meshing with the gear portion is fixed, and the tensile force due to the loop of the belt-shaped material into the mold included in the first press is cut off. In-mold pitch fluctuation preventing device.

Images