JP4734211B2 - Method for manufacturing ring-shaped member - Google Patents

Description

  The present invention relates to a method for manufacturing a ring-shaped member.

  Conventionally, a ring-shaped member 1 as shown in FIG. 12 is obtained by separating a plurality of annular ring-shaped members 1 from a material 2 having a predetermined plate thickness shown in FIGS. It was manufactured by a method of punching in a row or multiple rows.

  However, in the conventional manufacturing method, the yield rate, which is the ratio of the weight of the ring-shaped member 1 to the weight of the material 2, is poor, and the cost of the ring-shaped member 1 is increased.

  The reason for this is that the ratio of the skeleton S1 and the slug S2 to the ring-shaped member 1 is high. The “skeleton” is a frame-like scrap left by punching a plurality of ring-shaped members 1, and the “slag” is a punch when punching a plurality of ring-shaped members 1. It is a plurality of scraps that are punched and removed at the same time.

  Therefore, a method for forming the ring-shaped member shown in FIGS. 14A and 14B has been proposed (see, for example, Patent Document 1).

  The ring-shaped member forming method described in Patent Document 1 includes a step of continuously bending the width of an oval ring-shaped material into a circular shape while preventing its deformation, and the circular material. And a step of forming a perfect circle.

  That is, as shown in FIG. 14 (a), the inner and outer rolls 103 and 104 are movable, with one width on the short diameter side of the oval ring-shaped material 100 being slidably opposed to each other. A pair of bending rolls 105, and by rotating the inner and outer rolls 103, 104 in the direction of arrow F or in the opposite direction, the oval ring-shaped material 100 is fed in the direction of arrow L or in the opposite direction, while By pushing the bending roll 105 in the direction of the arrow G, the straight portion of the material 100 is sequentially curved to form a circular material 101.

  Next, as shown in FIG. 14B, a large-diameter inner roll 106 is externally fitted to the inner roll 103 so as to be simultaneously rotatable and is inscribed in a circular material 101, and the large diameter is formed in the arrow F or in the opposite direction. By rotating the inner roll 106 and the outer rolls 103 and 104, it is possible to obtain the ring-shaped member 102 formed into a perfect circle.

  According to such a ring-shaped member forming method, since the circular material 101 is obtained from the elliptical ring-shaped material 100, the ratio of the skeleton and slug to the perfect circular ring-shaped member 102 will be described with reference to FIG. The ring-shaped member 102 can be made of a material that is lower than the ratio of the skeleton S1 and the slug S2 to the ring-shaped member 1 and the yield rate, which is the ratio of the weight of the ring-shaped member 102 to the weight of the material, is improved. The cost can be reduced.

JP-A-62-203633

  However, in the method for forming the ring-shaped member described in Patent Document 1, the curved portion 107 having a small radius of curvature remaining in the circular material 101 is strong in the arrow K direction by the large-diameter inner roll 106. It is expanded from the inside by the pressing force. In this way, when the curved portion 107 having a small radius of curvature is expanded from the inside, a large “extension” occurs in the inward region of the curved portion 107 having a small radius of curvature, resulting in thinning of the meat and concentration of stress. . For this reason, in the process in which the circular shaped material 101 is formed into the perfect circular ring-shaped member 102, there is a possibility that a crack may occur in the inner diameter region of the curved portion 107, and this may occur with respect to the elliptical ring-shaped material 100. The yield rate, which is the ratio of the perfect circular ring-shaped member 102, was deteriorated, and the cost was increased.

  The present invention solves such a problem, and an object of the present invention is to improve the yield, which is the ratio of the weight of the ring-shaped member to the weight of the material, and to reduce the cost. In spite of being a ring-shaped member (corresponding to the oval ring-shaped material described in Patent Document 1), the ring-shaped member (formed in the perfect circular shape described in Patent Document 1) It is an object of the present invention to provide a method for manufacturing a ring-shaped member capable of improving the yield rate, which is a corresponding ratio.

The present invention relates to a method of manufacturing a ring-shaped member that obtains an annular ring-shaped member from a vertically long annular blank, wherein the vertically long annular blanks are opposed to each other on both sides in the width direction, and both ends of these straight portions in the vertically long direction. A pair of curvilinear portions that continue the portion, and the blank is formed into a blank having a width direction dimension that is larger than the dimension in the width direction of the blank by expanding the straight line portion outward in the width direction, and then A pair of large curved portions in which the curved portion is expanded so that the curved portion has a radius of curvature larger than the initial radius of curvature, and the curved portion has a curvature larger than the curvature radius of the curved portion. It is characterized in that it is formed into a semi-processed product having a pair of bulging portions that are curved in a circular arc shape with a radius, and then the semi-processed product is formed into an annular ring-shaped member.

According to such a configuration, since an annular ring-shaped member is obtained from a vertically long annular blank, the ratio of the skeleton and the slug to the ring-shaped member is reduced as compared with the case shown in FIG. It becomes possible to improve the yield, which is the ratio of the weight of the ring-shaped member to the weight of the material.
In addition, before forming a vertically long blank into an annular shape, first, after passing through a step of forming a straight portion into a blank having a widthwise dimension that is larger than the widthwise dimension of the blank by expanding outward in the widthwise direction. A large curved portion in which the curved portion is expanded so as to have a larger radius of curvature than the initial radius of curvature, and a bulged portion that is curved in an arc shape with a radius of curvature larger than the radius of curvature of the curved portion in the straight portion. Since it moves to the process of forming into a processed product, during the forming process of a semi-processed product, the “extension” of the inner diameter region with a small curvature radius in the curved portion is suppressed as much as possible, and the inner diameter region may become thin. In addition, the stress can no longer be concentrated in the inner diameter region, and the curved portion can be easily formed into a large curved portion having a large curvature radius without causing a crack in the curved portion.
Then, after undergoing such a semi-processed product forming step, it is formed into an annular ring-shaped member. Therefore, when forming the annular ring-shaped member, the large curved portion having a large curvature radius and the inside of the bulging portion are formed. “Extension” of the region is suppressed as much as possible, and the inner diameter region is prevented from becoming thin, and stress concentration in the inner diameter region is reduced. As a result, cracks do not occur in the large curved portion and the bulging portion, and the yield, which is the ratio of the ring-shaped member to the vertically long annular blank, can be improved.

  According to the present invention, by taking the material in which the ratio of the skeleton and the slug to the ring-shaped member is kept low, the yield rate which is the ratio of the weight of the ring-shaped member to the weight of the raw material is improved, and the cost of the ring-shaped member is reduced. be able to. In addition, the “extension” of the inner diameter region in the curved portion of the vertically long annular blank is suppressed as much as possible to avoid thinning of the inner diameter region, and stress is not concentrated in the inner diameter region. It is advantageous that cracks are not generated in the curved portion of the annular blank, and the yield rate, which is the ratio of the ring-shaped member to the longitudinal annular blank, can be improved.

  Hereinafter, preferred embodiments of a method for producing a ring-shaped member according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, while feeding a material 2 having a predetermined plate thickness in the longitudinal direction of the material 2 as indicated by an arrow X, a plurality of vertically-circular annular blanks are spaced at a predetermined interval l in the feeding direction by a pressing device. 3 is punched in series. In addition, as the raw material 2, what used the metal rods, such as copper, aluminum, iron, and stainless steel, as the plate-shaped body by rolling etc. is used, or the raw material of a plate-shaped body is used from the beginning. Further, the vertical annular blank 3 can be obtained by punching the metal material 2 instead of punching the plate-like material 2, for example, by pressing, forging, or the like.
As shown in FIG. 2, the vertically long blank 3 includes a straight portion 3 b, 3 c on both left and right sides facing each other with a vertically long hole 3 a having a small width dimension w <b> 1 inside, and the vertically long direction of these straight portions 3 b, 3 c. And a pair of curved portions 3d that make both end portions continuous, and this vertically-circular annular blank 3 is set in the first embossing device 4 as shown in FIG.

  The first embossing device 4 includes a moving plate 5 and a pair of front and rear guide plates 6. The moving plate 5 is guided by the guide plate 6 and moved in the left-right direction (arrows X1, X2) by an advancing / retreating mechanism (not shown). Direction). The movable plate 5 includes a main body portion 5a and flange portions 5b and 5b formed at both ends of the main body portion 5a in the front-rear direction. The vertical step surface 5c formed at the boundary between the main body portion 5a and the flange portions 5b and 5b is slid on the end surface 6b of the guide plate 6 on the side facing the other party. It arrange | positions so that it may contact | abut freely. Further, at the center of the main body 5 a of the moving plate 5, a projection-plane-shaped inner die 8-1 is projected upward on a straight line Y orthogonal to the straight line X. The width dimension w2 of the inner mold 8-1 is set to be slightly smaller than the width dimension w1 of the vertically long hole 3a so that it can be fitted into the vertically long hole 3a of the blank 3.

  The guide plate 6 in the first embossing device 4 is provided with a pair of front and rear positioning protrusions 8-2 and two pairs of front and rear positioning and deformation allowing protrusions 9. As will be described later, the pair of positioning protrusions 8-2 prevents the vertically elongated blank 3 from moving in the directions of the arrows Y 1 and Y 2 when the vertically elongated blank 3 is set in the first embossing device 4. In order to position the vertically long blank 3 at an appropriate position, they are opposed to each other on the straight line Y orthogonal to the straight line X, and are erected at symmetrical positions with the straight line X in between. The opposing interval is set to a value slightly larger than the longitudinal dimension of the vertically annular blank 3 so that the vertically annular blank 3 can be set.

  In addition, as described later, when the longitudinal annular blank 3 is set on the first embossing device 4, the longitudinal annular blank 3 is moved in the directions of the arrows X1 and X2, as will be described later. This is for preventing the movement, positioning the vertically long annular blank 3 at an appropriate position, and allowing deformation of the vertically long annular blank 3 by the inner mold 8-1, and passes through the center of the moving plate 5. It is erected at a symmetrical position with the straight line X and the straight line Y in between, and the opposing interval in the straight line X direction is such that the longitudinal annular blank 3 can be set in the width direction of the longitudinal annular blank 3. It is set to a value slightly larger than the dimension. Each positioning / deformation allowing projection 9 has an arcuate deformation allowing surface 9b formed continuously with the positioning surface 9a parallel to the straight line Y.

  As shown in FIG. 3, when the vertically long blank 3 is set in the first embossing device 4, the upper die 10 indicated by a two-dot chain line is lowered from above. As a result, the upper surfaces of the guide plate 6, the positioning projection 8-2 and the positioning / deformation allowing projection 9 are pressed by the lower surface of the upper mold 10, and the upper surfaces of the blank 3 and the inner mold 8-1 are brought into contact with the lower surface of the upper mold 10. In contrast, the blank 3 is prevented from warping by facing through a very small gap (a small gap in which sliding is allowed).

  In this state, the moving plate 5 is moved in the arrow X2 direction. As a result, the inner mold 8-1 presses and urges the right straight portion 3c of the vertically long blank 3 in the direction of the arrow X2 from the inside thereof, and pushes and bends it in the direction of the arrow X2 as shown in FIG. By moving the plate 5 in the direction of the arrow X1, the inner mold 8-1 presses and biases the left straight portion 3b (see FIG. 3) of the vertically long annular blank 3 in the direction of the arrow X1 from the inside thereof, as shown in FIG. As shown in the figure, the vertically elongated blank 3A is formed by pressing and bending in the direction of the arrow X1 and deforming the dimension in the width direction larger than the dimension in the width direction of FIG. In this molding process, the expansion deformation of the straight portions 3b and 3c on the left and right sides of the vertically-circular annular blank 3 shown in FIG. The positioning and deformation allowing projections 9 are allowed to be expanded until they contact each arcuate deformation allowing surface 9b, and the deformation allowing surface 9b is formed in an arc shape. It can suppress that the meat | flesh of an expansion deformation part becomes thin.

  The deformed vertically long annular blank 3A shown in FIG. 4 is set in the second embossing device 11 shown in FIG. 5 in the next step.

  The second die pressing device 11 includes a pair of left and right molded outer dies 12 and a pair of front and rear restricting dies 13, and the molded outer die 12 is guided by a guide groove 14 and is moved to a base 15 by an advancing / retracting mechanism (not shown). Move up and down in the left-right direction (arrow X1, X2 direction).

  The outer mold 12 includes a mounting surface 12a and a pressing surface 12b that protrudes vertically upward from the mounting surface 12a and has a projection plane shape that is recessed in an arc shape. The radius of curvature of the pressing surface 12b is a deformed vertically long shape. It is set to a value larger than the radius of curvature of the outer peripheral surface of the curved portion 3d in the annular blank 3A. Further, the restriction die 13 is formed with a restriction surface 13a whose projection plane shape is recessed in an arc shape on the end face on the side facing the counterpart. Furthermore, a projection plane shaped boat-shaped holding inner die 16 is provided extending in the straight line X direction so as to protrude upward from the upper surface of the central portion of the base 15, and the width dimension of the holding inner die 16 is a deformed vertically long annular blank 3A. The size is set to be slightly smaller than the width of the vertically long hole 3e so that the vertically long hole 3e can be fitted. Further, arc-shaped holding surfaces 16a are vertically provided at both ends of the holding inner mold 16 on the straight line X, and notches 16b are provided below these holding surfaces 16a and the vicinity thereof.

  As shown in FIG. 5, the holding inner die 16 is sandwiched between the straight portions 3b and 3c of the deformed vertically long annular blank 3A, and the curved portion 3d of the blank 3A and the vicinity thereof are placed on the mounting surface 12a of the molding outer die 12. When the vertically-circular annular blank 3A is set on the second embossing device 11 in the mounted state, the upper die 17 indicated by a two-dot chain line is lowered from above. As a result, the upper surfaces of the restriction die 13 and the holding inner die 16 are pressed by the lower surface of the upper die 17, and the upper surfaces of the vertically long annular blank 3 </ b> A and the molded outer die 12 are extremely small with respect to the lower surface of the upper die 17 (sliding). The blank 3 </ b> A is prevented from warping through a small gap) that is allowed to move.

  In this state, the outer mold 12 is moved in the directions of arrows X1 and X2. As a result, the pressing surface 12b of the outer mold 12 presses and biases the outer side of the curved portion 3d of the deformed vertically long annular blank 3A toward the mating curved portion 3d. At this time, the mounting surface 12 a of the outer mold 12 enters the notch 16 b of the holding inner mold 16. Therefore, as shown in FIG. 6, both curved portions 3d are positioned so that the inner surfaces of the curved portions 3d are slightly expanded by the arc-shaped holding surface 16a of the holding inner mold 16 and the movement in the directions of the arrows X1 and X2 is restricted. Then, the outer surface having a large curvature radius is pressed inward from the outside by the pressing surface 12b that is recessed in the arc shape of the outer mold 12, thereby deforming along the pressing surface 12b. A large curved portion 3D having a radius of curvature larger than the radius of curvature is formed, and an “extension” is generated in the outer diameter region of the large curve portion 3D. In addition to avoiding thinning, a material flow that thickens the large curved portion 3D occurs, and stress concentration in the inner diameter region is reduced. As a result, both curved portions 3d can be formed into a large curved portion 3D that is advantageous for manufacturing the ring-shaped member 1 with a radius of curvature larger than the initial radius of curvature without causing cracks in both curved portions 3d. Moreover, the yield which is the ratio of the ring-shaped member 1 to the vertically long blank 3A can be improved.

  In the process of forming the large curved portion 3D having a larger radius of curvature than the curved radii of both curved portions 3d, the straight portions 3b and 3c in the deformed vertically long annular blank 3A shown in FIG. 5 expand in the directions of the arrows Y1 and Y2. As shown in FIG. 6, a pair of bulged portions 3E curved in an arc shape with a radius of curvature larger than the initial radius of curvature of the curved portion 3d are formed at the center thereof, as shown in FIG. The outer surface abuts on the regulation surface 13a that is recessed in the arc shape of the regulation mold 13 to restrict the deformed vertically long annular blank 3A (see FIG. 5) from being excessively expanded in the directions of the arrows Y1 and Y2. And a pair of large curved portions 3D having a large radius of curvature and a pair of large curved bulge portions 3E curved in an arc shape, and the large curved portion 3D and the bulged portion 3E have four short straight portions. Semi-processed products 18 that are continuous with each other through 3F are formed. It is.

  The semi-processed product 18 shown in FIG. 6 is set in the third die pressing device 19 shown in FIG. 7 in the next step.

  The third embossing device 19 has a base 20 and an upper plate 21 that closes the upper surface of the base 20 with a gap in the height direction. The base 20 is guided on a straight line X passing through the center thereof. A groove 22 is provided, and a movable plate 23 is fitted in the guide groove 22 so as to be movable back and forth in the directions of arrows X1 and X2. The moving plate 23 moves back and forth in the directions of arrows X1 and X2 by an advancing / retreating mechanism (not shown). The upper surface of the moving plate 23 is flush with the upper surface of the base 20, and a finish inner mold 24 having an elliptical projection plane shape passes through the center of the base 20 at a central portion thereof. It protrudes upward at the top. The finished inner mold 24 faces a substantially circular window portion 25 formed on the upper plate 21, and the inner peripheral surface of the window portion 25 functions as an outer mold.

  As shown in FIG. 7, when the semi-processed product 18 is set in the third die pressing device 19, the upper die 26 indicated by a two-dot chain line is lowered from above. As a result, the upper surface of the upper plate 21 is pressed against the lower surface of the upper die 26, and the upper surfaces of the semi-processed product 18 and the finished inner die 24 are extremely small with respect to the lower surface of the upper die 26 (small clearance that allows sliding). ) To prevent the workpiece 18 from warping.

  In this state, the moving plate 23 is moved in the arrow X2 direction. As a result, the finished inner mold 24 presses and urges the right half of the semi-processed product 18 in the direction of the arrow X2 from the inside thereof, and the outer peripheral surface of the right half as shown in FIG. The right half of the half-processed product 18 is formed into a semicircular shape. Subsequently, the moving plate 23 is moved in the arrow X1 direction. As a result, the finished inner mold 24 presses and urges the left half of the semi-processed product 18 in the direction of the arrow X1 from the inside thereof, and the outer peripheral surface of the left half as shown in FIG. The annular ring-shaped member 1 shown in FIGS. 9 and 12 is manufactured by pressing the left half of the half-finished product 18 into a semicircular shape. As described above, when the semi-processed product 18 is formed into the annular ring-shaped member 1, the “extension” of the large curved portion 3D and the bulging portion 3E having a large curvature radius is suppressed as much as possible. Thinning of the flesh is avoided, and stress concentration in the inner diameter area is eased. As a result, no cracks occur in the large curved portion 3D and the bulging portion 3E.

  Thus, according to the present invention, a plurality of vertically-circular annular blanks 3 are punched out from the material 2 shown in FIG. 1, and these longitudinally-circular blanks 3 are removed by the first to third embossing devices 4, 11, 19. The ring-shaped member 1 shown in FIGS. 9 and 12 is manufactured by expanding and forming into an annular shape. Therefore, the ratio of the skeleton S1 and the slug S2 in FIG. 1 to the ring-shaped member 1 is less than the ratio of the skeleton S1 and the slug S2 to the ring-shaped member 1 described in FIG. The yield rate which is the ratio of the weight of the ring-shaped member 1 can be improved, and the cost of the ring-shaped member 1 can be reduced.

  Further, the outer side of the pair of curved portions 3d in the deformed vertically long annular blank 3A by the second embossing device 11 is directed toward the mating curved portion 3d by the pressing surface 12b recessed in the arc shape of the outer mold 12. By pressing and energizing, each curved portion 3d is in a positioning state in which its inner diameter is slightly expanded by the arc-shaped holding surface 16a of the holding inner mold 16 and movement in the directions of the arrows X1 and X2 is restricted. The outer surface of the outer diameter is pressed inward from the outside by the pressing surface 12b that is recessed in the arc shape of the outer mold 12, so that the large curved portion 3D having a large curvature radius is deformed along the pressing surface 12b. As a result, the “extension” of the outer region with a large radius of curvature can be suppressed as much as possible, and the thickness of the inner curved region 3D can be avoided. Flow occurs, diameter To alleviate the stress concentration of the band. As a result, both curved portions 3d can be formed into a large curved portion 3D that is advantageous for manufacturing the ring-shaped member 1 with a large curvature radius without generating a crack in the curved portion 3d. The yield rate which is the ratio of the ring-shaped member 1 can be improved, and the cost of the ring-shaped member 1 can be reduced.

  In the embodiment, as shown in FIG. 2, the ring-shaped member 1 is manufactured by punching a vertically long blank 3 having a small width w <b> 1 of the vertically long hole 3 a and expanding the blank 3. As shown in FIG. 10, a vertical annular blank 27 having an oblong vertical hole 27a whose width dimension w3 is sufficiently larger than the width dimension w1 of FIG. 2 is punched out, and this blank 27 is subjected to the same procedure as in the above embodiment. The ring-shaped member 1 can also be formed by being expanded. Also in this case, the yield rate, which is the ratio of the ring-shaped member 1 to the vertically long annular blank 27, can be improved, and the cost of the ring-shaped member 1 can be reduced, as in the above embodiment.

  Further, when punching a plurality of vertically-circular annular blanks 3 and 27 from a material 2 having a predetermined width, as shown in FIGS. A pair of curved portions 3d that form the outer end surfaces of the straight portions 3b and 3c in the annular blanks 3 and 27 and make the pair of straight portions 3b and 3c continuous with each other by shearing the material 2 by a pressing device are arranged in the longitudinal direction. It can be formed at both ends. As a result, the material can be taken with the scrap ratio to the vertically long blanks 3 and 27 being minimized. That is, the scrap is punched and removed by a punch when punching the vertically long hole 3a or the oblong vertically long hole 27a, and the longitudinal direction as shown by diagonal lines in FIGS. 11 (a) and 11 (b). And the drum-shaped end plate 2x existing between the vertically long annular blanks 3 or the blanks 27 which are separated from the material 2. As a result, the yield, which is the ratio of the weight of the ring-shaped member 1 to the weight of the material 2, can be further improved.

  Furthermore, the manufacturing method of the ring-shaped member of the present invention is also characterized in the following points.

  The vertically annular blank 3 is formed into an annular shape by pressing the curved portions 3d at both ends in the longitudinal direction from the outside toward the other side. By doing in this way, the material removal which made the ratio of the skeleton and slug with respect to the ring-shaped member 1 restrained low becomes possible, and the yield rate which is the ratio of the weight of the ring-shaped member 1 with respect to the weight of a raw material can be improved. it can. Further, by pressing the curved portions 3d at both ends in the longitudinal direction from the outside toward the other side, the “extension” of the inner diameter region having a small radius of curvature in the curved portions 3d is suppressed as much as possible, and the inner diameter is thin. In addition, the flow of the material that thickens the curved portion 3d is generated, and the stress concentration in the inner diameter region is relieved. As a result, no crack occurs in the curved portion 3d, and the yield, which is the ratio of the ring-shaped member 1 to the vertically long blank 3, can be improved.

  Further, it is desirable that the vertically long blank 3 is formed into an annular shape by means of the pressing devices 11 and 19 including the inner dies 16 and 24 and the outer dies 12 and 25. According to this, it is possible to efficiently manufacture the high-quality ring-shaped member 1 and reduce the cost.

Further, the vertically long blank 3 has a vertically long hole 3a on the inner side thereof, and the straight portions 3b and 3c facing each other on both sides in the width direction and both ends of the straight portions 3b and 3c in the longitudinal direction are continuous. The width of the longitudinal annular blank 3 is increased by pressing the linear portions 3b and 3c by the inner mold 8-1 fitted with the longitudinal hole 3a. In a state where the holding inner mold 16 is fitted in the vertically elongated hole 3a whose dimension in the direction is expanded, the outer side of the curved portion 3d is pressed and urged toward the mating curved portion 3d by the molded outer mold 12, and these It is desirable to push the curved portion 3d into a large curved portion 3D having a large curvature radius.
Thus, after extending the width direction dimension of the vertically long annular blank 3 by the inner mold 8-1 fitted in the vertically long hole 3a, the holding inner mold is held in the vertically long hole 3a whose width direction dimension is expanded. 16, the outer curved portion 3 d is pressed and urged toward the mating curved portion 3 d with the outer mold 12, so that the curved portion 3 d is deformed by the holding inner die 16. In a state where the movement to the portion 3d is restricted and positioned, the outer shape 12 is pressed inward from the outside by the molding outer die 12, so that the "extension" of the inner diameter region having a small curvature radius in the curved portion 3d is caused. It is suppressed as much as possible to avoid thinning of the inner diameter region, stress is not concentrated in the inner diameter region, and both curved portions 3d have a large radius of curvature without causing cracks in the curved portion 3d. The curved portion 3D can be easily formed.

It is a top view which shows 1st Embodiment of the process of punching a blank from a raw material. It is an enlarged front view which shows the blank punched out from the raw material of FIG. It is a top view which shows embodiment of the state which set the blank to the 1st stamping apparatus. It is a top view which shows embodiment of the state in which the blank which deform | transformed with the 1st type | mold embossing apparatus was shape | molded. It is a top view which shows embodiment of the state which set the deform | transformed blank to the 2nd embossing apparatus. It is a top view which shows embodiment of the state in which the semi-finished product was shape | molded by the 2nd die pressing apparatus. It is a top view which shows embodiment of the state which set the semi-processed product to the 3rd die pressing apparatus. It is a top view which shows embodiment of the state in which the right half part of the semi-processed product was shape | molded by the 3rd type | mold embossing apparatus in the semicircle shape. It is a top view which shows embodiment of the state in which the semi-processed product was shape | molded by the 3rd type | mold embossing apparatus in the ring-shaped member. It is an enlarged front view which shows 2nd Embodiment of a blank. It is a top view which shows other embodiment of the process of punching a blank from a raw material. It is a front view which shows an example of a ring-shaped member. It is a top view which shows the conventional process which punches a blank from a raw material, Fig.13 (a) shows single row punching, FIG.13 (b) has shown parallel punching. It is explanatory drawing of the shaping | molding method of the ring-shaped member of patent document 1. FIG.

DESCRIPTION OF SYMBOLS 1 Ring-shaped member 3 Vertically long annular blank 3b, 3c Straight line part 3A The blank of the dimension of the expanded width direction 3D Large curve part 3d Curved part 3E Expansion part 18 Semi-processed goods

Claims (1)

In the method of manufacturing a ring-shaped member that obtains an annular ring-shaped member from a vertically long annular blank, the vertically long blanks are continuous with each other in the width direction on both sides, and both ends in the lengthwise direction of these straight line portions are continuous. A pair of curved portions, and the blank is formed into a blank having a width direction dimension that is larger than the width direction dimension of the blank by expanding the linear portion outward in the width direction, and then expanding the blank. A blank having a dimension in the width direction is a pair of large curved portions in which the curved portion is expanded so as to have a radius of curvature larger than the initial radius of curvature, and the straight portion has an arc shape with a radius of curvature larger than the radius of curvature of the curved portion. A method of manufacturing a ring-shaped member , comprising: forming a semi-processed product having a pair of bulged portions formed into a curved shape, and then forming the semi-processed product into an annular ring-shaped member .

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