JP2017006971A - Manufacturing method of press working product and press working product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a press working product, efficient in work, and capable of restraining strain of a work, by preventing the occurrence of a burr and sticking of a foil-like separation object, in an outer peripheral surface of the punching-separated work.SOLUTION: A manufacturing method of this press processing product includes a groove part forming press process of forming a pair of groove parts 5 and 5' on a work surface 1a and a work reverse surface 1b in a separated work 1B so that its deepest parts 5a and 5a' run along the final punching expected line and the final punching process of punching-separating by rupturing between the deepest parts 5a and 5a' by striking an outside scrap part 1Bb of the deepest parts 5a and 5a' by providing a clearance V.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a method for manufacturing a press-processed product that prevents the occurrence of burrs on the outer peripheral surface of a workpiece, and the press-processed product.

  A press-processed product is completed when a work (workpiece) undergoes press processing steps using various dies. This includes a punching process in which a part of the workpiece is punched and removed, or a part that becomes a workpiece in the subsequent process is punched and separated from the workpiece of the strip-shaped material plate (coil material). In the punching process, generally, a punch formed in the shape of a line to be punched is provided in the upper die or the lower die of the mold, and a die having a die hole corresponding to the shape of the punch is provided in the lower die or the upper die. Then, the upper die (punch or die) is lowered and pressed against the work placed on the lower die (die or punch), and sheared in the vertical direction along the planned punch line by the punch and die.

  At this time, the workpiece material (metal material) follows the upper die (punch or die) due to friction, and burrs are generated near the workpiece back surface (work back surface) on the shear surface of the workpiece. Deburring is performed by crushing. This deburring requires extremely careful work so that no deburring or foil delamination adheres during the deburring process, and it cannot be said that it is easy to ensure the completeness of the work. .

  Therefore, a punching method that does not require deburring has also been proposed.

  For example, Patent Document 1 discloses a groove forming process for forming a pair of grooves (cross-sectionally V-shaped) along a line to be punched on the work surface (work surface) and the work back surface in the work, and punching inside the groove. A punching method is disclosed, which includes a step of lowering and pressing and hitting, causing a crack (breaking) and dropping an inner part of the crack from the workpiece. Using this series of groove forming process and punching process, the central part (the central part in the plate thickness direction) of the inner peripheral surface punched out of the workpiece becomes a fracture surface, but no burr occurs, and the vicinity of the workpiece surface And the vicinity of the back surface of the workpiece is a smooth surface. Formation of a pair of groove portions on the work surface and the work back surface in the groove forming step is performed by moving the groove cutting tool in the X-axis and Y-axis directions and cutting. Patent Document 1 also describes that the groove is formed only on the back surface of the workpiece.

  In Patent Document 2, a groove portion is formed in a workpiece of a belt-shaped material plate to form a groove portion (a concave portion having a trapezoidal shape, a semicircular shape, a semi-elliptical shape, a V shape, etc.) along the line to be punched on the work surface or the work back surface A punching method is disclosed that includes a process and a punching process in which a punch is lowered and pressed along the groove to shear the work in a vertical direction, thereby punching and separating a part that becomes a work in a subsequent process. ing. Here, the burr | flash which generate | occur | produces at the punching process is produced in a groove part, and it is made not to reach the workpiece | work surface or a workpiece | work back surface. Formation of the groove part on the workpiece front surface or the workpiece rear surface in the groove part forming step is performed by pressing with a punch (pressure) provided with a convex part corresponding to the groove part.

Japanese Patent Laid-Open No. 5-42330 JP 2014-172079 A

  The press-processed product manufactured using the punching method including the series of groove forming process and the punching process disclosed in Patent Documents 1 and 2 and the like is the surface that was the work surface or the work back surface. When other parts are arranged substantially in parallel, it is possible to prevent other articles from being damaged by burrs or foil-like exfoliations. In particular, this is very effective when a press-processed product is used for an electronic component and another article may cause a short circuit or the like due to a burr or a foil-like peeled material.

  However, in Patent Document 2, since shear is used in the punching process, it is not always easy to make sure that the burr is generated and that it does not reach the workpiece surface or the workpiece back surface for all workpieces. is not.

  In Patent Document 1, burrs are not generated because fracture is used in the punching process. However, in the groove forming process, at least the groove portion on the back surface of the workpiece is formed on the surface of the workpiece and the back surface of the workpiece. It is done by moving in the direction and cutting. From the viewpoint of improving work efficiency, it is more desirable to press with a punch provided with a convex portion corresponding to the groove portion, rather than moving the groove cutting tool in the X-axis and Y-axis directions for cutting.

  The inventor of the present application, when punching and separating a part to be a workpiece in the subsequent process (that is, a part to be finally a press-processed product) from the workpiece of the strip-shaped material plate, It was discovered that when the groove portion was formed by pressing with a punch having a convex portion, the workpiece flowed easily due to the large amount of material flow of the workpiece. When the workpiece is distorted, there is a possibility that the standard such as a dimension required for a press-processed product may not be satisfied, and there may be a problem in the manufacturing process. For example, as shown in FIG. 11, the workpiece 101A is deformed by the formation of the groove 105 and the position or shape of the alignment hole 104 is changed, and when the groove formation process is completed, the workpiece 101A is inserted from the guide post inserted into the alignment hole 104. It may happen that it becomes impossible to extract the material or that the subsequent punching process cannot be executed.

  The present invention has been made in view of such reasons, and its purpose is to prevent the generation of burrs and adhesion of foil-like exfoliation on the outer peripheral surface of a separated workpiece, and the work is efficient. An object of the present invention is to provide a method of manufacturing a press-processed product that can suppress distortion of a workpiece.

  In order to achieve the above object, according to the method for manufacturing a press-worked product according to claim 1, in the separated work, a pair of groove portions are provided on the work surface and the work back surface, and the deepest portion of the groove portion is along a final punched line. And a final punching step of punching and separating by punching the scrap part outside the deepest part of the groove with a clearance and breaking between the deepest parts of the groove part. It is characterized by becoming.

  The press-worked product manufacturing method according to claim 2 is the press-worked product manufacturing method according to claim 1, wherein the final punched line is preliminarily enlarged before the groove forming press step. It is characterized by comprising a pre-punching step of shearing and separating the work along a predetermined line.

  The method for manufacturing a press-processed product according to claim 3 is the method for manufacturing a press-processed product according to claim 1 or 2, wherein the cross-sectional shape of the groove portion is such that the outer inclination at the deepest portion is more than the inner inclination. It is characterized by being gentle.

  The method for manufacturing a press-processed product according to claim 4 is the method for manufacturing a press-processed product according to any one of claims 1 to 3, wherein in the groove forming press step, an outer side of the deepest part of the groove is formed. The width is at least longer than the plate thickness.

  The press-processed product according to claim 5 is manufactured by the press-processed product manufacturing method according to any one of claims 1 to 4.

  The press-processed product according to claim 6 is the press-processed product according to claim 5, wherein the length of the fracture surface of the central portion of the surface that is the outer peripheral surface of the workpiece is 5 to 30% of the plate thickness. It is characterized by being.

  The press-processed product according to claim 7 is the press-processed product according to claim 5 or 6, wherein the tilt angles on both sides of the fracture surface of the central portion of the surface which is the outer peripheral surface of the workpiece are 70 to 90 degrees. It is characterized by being.

  The press-processed product according to claim 8 is the press-processed product according to any one of claims 5 to 7, wherein both corners of the surface which is the outer peripheral surface of the workpiece are rounded. It is characterized by that.

  The press-processed product according to claim 9 is the press-processed product according to any one of claims 5 to 8, wherein a fracture surface is formed on all or part of the outer peripheral surface of the workpiece. It is characterized by being.

  According to the method for manufacturing a press-formed product according to the present invention, generation of burrs and foil-like peeling on the outer peripheral surface of the work obtained through the final punching process, that is, the surface that was the outer peripheral surface of the work in the press-processed product. The adhesion of objects can be prevented, the work is efficient, and distortion of the workpiece can be suppressed.

It is a perspective view which shows the external appearance of the example of the press work goods manufactured by the manufacturing method which concerns on embodiment of this invention. It is a top view which shows the workpiece | work used as a press work product same as the above. It is a top view which shows the workpiece | work of the pre-punching process of the manufacturing method of the press work goods which concern on embodiment of this invention. It is sectional drawing which shows the outline of the preparation punching process of the manufacturing method of a press work product same as the above. It is a top view which shows the workpiece | work of the groove part formation press process of the manufacturing method of a press work product same as the above. It is an expanded sectional view which shows a part of cross section of the workpiece | work of the groove part formation press process of the manufacturing method of a press work product same as the above. It is sectional drawing which shows the outline of the groove part formation press process of the manufacturing method of a press work product same as the above. It is an expanded sectional view which shows the mode of the impact in the final punching process of the manufacturing method of a press work product same as the above. It is an expanded sectional view which shows the mode after the impact in the final punching process of the manufacturing method of a press work product same as the above. It is sectional drawing which shows the outline of the final punching process of the manufacturing method of a press work product same as the above. It is a reduction | restoration top view which shows the deformation | transformation of the workpiece | work after the groove part formation process of the manufacturing method of the conventional press work goods.

  Embodiments of the present invention will be described below. A press-processed product 1 manufactured by a manufacturing method according to an embodiment of the present invention includes, for example, a rectangular main body 10 and two legs 11 extending in a direction substantially perpendicular thereto as shown in FIG. It is what you have. Such a press-processed product 1 is obtained by bending the two leg portions 11 of the flat workpiece 1C that has been processed as shown in FIG.

  The press-work product 1 can be used as a current collector connected to any electrode of the element in the battery unit. In this case, since the electrode of the element is disposed so as to be sandwiched between the two leg portions 11, the surface 1b 'which is the back surface (work back surface) 1b of the workpiece 1C is opposed to the element. As will be described later, the workpiece 1C has a smooth surface in the vicinity of the workpiece surface 1a and the workpiece back surface 1b on the outer peripheral surface 1c, and no burrs are generated and no foil-like peeled material is attached. Therefore, the element can be prevented from being damaged by the press-processed product 1. In FIG. 1, a surface that is the workpiece surface 1a of the workpiece 1C is denoted by reference numeral 1a ', and a surface that is the outer peripheral surface 1c of the workpiece 1C is denoted by reference numeral 1c'. Moreover, in FIG. 2, although the workpiece back surface 1b does not appear, it is a surface on the back side of the workpiece surface 1a.

  The manufacturing method of the press-worked product according to the embodiment of the present invention includes the following preliminary punching step, groove forming press step, and final punching step. The workpiece 1C is obtained through these steps.

  As shown in FIG. 3, the preliminary punching step is a step of punching and separating the workpiece 1A by shearing it in the vertical direction (perpendicular to the workpiece surface 1a) along the preliminary punching scheduled line 2. The pre-punching planned line 2 has a shape that is substantially enlarged from a final punching scheduled line 3 to be described later. The substantially enlarged shape means a shape having unevenness corresponding to the unevenness of the final punched line 3 and includes a shape obtained by expanding the final punched line 3 substantially proportionally, but is not limited thereto.

  Specifically, in the pre-punching step, a pre-punching punch P1 formed in the same contour shape as the pre-punching line 2 is provided in the lower die of the mold, and a die hole corresponding to the pre-punching punch P1 is formed. The die D1 is provided on the upper die (see FIG. 4A), and the upper die D1 is lowered and pressed against the workpiece 1A placed on the preparation punch P1 to prepare the punch P1 for preparation punching. Then, the die D1 is sheared in the vertical direction along the pre-punched line 2 (see FIG. 4B). After punching by shearing, the die D1 is removed from the workpiece 1B that has been punched and separated (see FIG. 4C). A knockout N1 is provided in the die hole portion of the upper die D1, and it is easy to remove the die D1 by pressing the work 1B that bites into the die D1. Although not shown, the knockout N1 is usually coupled to the back plate to which the die D1 is fixed via a spring body on the upper surface thereof. The workpiece 1A is a strip-shaped material plate (coil material) workpiece, and has an alignment hole 4 (see FIG. 3). In the process up to this preparation punching process, the movement of the workpiece 1A between processes is The progressive feeding method is adopted.

  As shown in FIGS. 5 and 6, in the groove forming press step, a pair of grooves 5 and 5 ′ are formed on the workpiece surface 1a and the workpiece back surface 1b in the punched and separated workpiece 1B, and the deepest portion 5a of the grooves 5 and 5 ′. 5a 'is formed along the final punching scheduled line 3. More specifically, the position of the deepest part 5a ′ of the groove part 5 ′ may be made coincident with the position of the deepest part 5a of the groove part 5, or the groove part 5 may be stabilized in order to stabilize the shape of the fracture surface 6 described later. The position of the deepest part 5a may be slightly inside or outside. The inside of the deepest portions 5a and 5a 'of the groove portions 5 and 5' is the main body portion 1Ba, and the outside is the scrap portion 1Bb. As will be described later, the workpiece 1B is punched and separated at the deepest portions 5a and 5a ′ of the groove portions 5 and 5 ′ in the final punching step, and the main body portion 1Ba becomes the workpiece 1C used in the subsequent steps, and the scrap portion 1Bb is unnecessary. Part.

  In detail, the pair of grooves 5, 5 ′ in the groove forming press step is formed by pressing with upper and lower groove forming punches P2a, P2b provided with convex portions corresponding to the grooves 5, 5 ′. (See FIGS. 7A and 7B). A hole is formed at the center of each of the upper mold and the lower mold groove forming punches P2a and P2b, and knockouts N2a and N2b are formed in the holes, and they bite into the groove forming punches P2a and P2b. The workpiece 1B is pressed to facilitate removal of the groove forming punches P2a and P2b (see FIG. 7C). Although not shown, the knockout N2a is usually connected to the upper back plate to which the groove forming punch P2a is fixed via a spring body on the upper surface thereof, and the knockout N2b is usually used to form the groove on the lower surface thereof. The punch P2b is coupled to a lower back plate to which the punch P2b is fixed via a spring body. The groove portion 5 and the groove portion 5 'may be formed at the same time as described above, or may be formed separately in two steps. In addition, in the process after this groove part formation press process, the transfer system is employ | adopted for the movement between processes of the workpiece | work 1B (or workpiece | work 1C).

Thickness _{T W} of the workpiece. 1B, for example, about 2 mm. Deepest 5a, the length TG between 5a 'is preferably 5 to 30% of the thickness _{T W.} TG in some cases 5% shorter and the groove forming punch than P2a of the thickness T _W, the convex portion of P2b is easily worn or damaged. Further, there is a case where TG is the longer than 30% of the thickness T _W, becomes not easy breaking to be described later between the deepest portion 5a, 5a '. Note that the length TG between the deepest portions 5a and 5a ′ is that of the fracture surface 6 of the outer peripheral surface 1c of the workpiece 1C, that is, the surface 1c ′ that was the outer peripheral surface 1c of the workpiece 1C in the pressed product 1 as will be described later. It becomes length. Further, the thickness _{T W} of the workpiece. 1B, the plate thickness of the workpiece 1C, i.e. the thickness of the pressed product 1, and becomes.

  In this way, after the workpiece 1B is punched and separated from the workpiece 1A in the preparation punching step, the pair of grooves 5, 5 'are formed by the workpiece 1B. If it does so, the material (metal material) of the part of groove part 5, 5 'can be made to flow toward the scrap part 1Bb of the outer side. The peripheral portion of the scrap portion 1Bb is expanded by the material that has flowed. Therefore, it is possible to prevent the workpiece 1B (particularly the main body portion 1Ba) from being distorted.

  The cross-sectional shape of the groove portions 5 and 5 'is preferably substantially V-shaped so that cracks are easily formed between the deepest portions 5a and 5a' as will be described later. More preferably, the outer gradient at the deepest portions 5a and 5a 'is made gentler than the inner gradient. In other words, the outer inclination angle (angle with respect to the plane parallel to the workpiece surface 1a or the workpiece back surface 1b) φo in the deepest portions 5a and 5a ′ is made smaller than the inner inclination angle φi in the deepest portions 5a and 5a ′. . This makes it easy for the material of the groove portions 5 and 5 ′ to flow toward the scrap portion 1 </ b> Bb on the outer side (easy to escape). The inclination angle φo is preferably 10 to 40 degrees. This further facilitates the flow of the material toward the scrap portion 1Bb. The inclination angle φi is preferably 70 to 90 degrees. When the inclination angle φi is smaller than 70 degrees, the work 1B (specifically, the main body portion 1Ba) strongly bites the groove forming punches P2a and P2b, so that the groove forming punches P2a and P2b are removed from the work 1B. It may not be easy.

  Further, the cross-sectional shape of the groove portions 5 and 5 ′ is curved on the inner side of the deepest portions 5a and 5a ′, and the corners with the workpiece surface 1a and the corner portions with the workpiece back surface 1b are rounded (R). be able to. In this way, the inner side of the deepest part 5a, 5a 'becomes the outer peripheral surface 1c of the workpiece 1C, and therefore the required round (R) can be attached here at the corner of the press-worked product 1.

In the groove forming press process, 'deepest 5a, 5a' of than the outer width (the width of the scrap portion 1Bb) _{W S} pair of grooves 5 and 5, the scrap portion 1Bb is not pulled in the body portion 1Ba as such, should not too short, preferably longer than at least the thickness T _W.

The final punching step, as shown in FIG. 8, 'deepest 5a of, 5a' pair of grooves 5 and 5 the outer scrap portions 1Bb of strikes by providing clearance C _L, deepest portion of the groove 5, 5 ' This is a step of punching and separating by breaking between 5a and 5a ′. As shown in FIG. 9, cracks are formed between the deepest portions 5 a and 5 a ′ of the grooves 5 and 5 ′ by this impact, and the fracture surface 6 is formed, but no burrs are generated, and work surfaces on both sides of the fracture surface 6 are formed. The vicinity of 1a and the vicinity of the workpiece back surface 1b remain smooth. In the workpiece 1B, the inner side of the fracture surface 6 between the deepest portions 5a and 5a ′ of the groove portions 5 and 5 ′ is the workpiece 1C (see FIG. 2). Therefore, in the outer peripheral surface 1c of the workpiece 1C, the central portion (the central portion in the plate thickness direction) is the fracture surface 6, but no burr is generated, and the workpiece surface 1a and the workpiece back surface 1b on both sides of the fracture surface 6 are adjacent. Is a smooth surface. Moreover, since the outer peripheral surface 1c in the workpiece 1C does not have to be deburred such as pressing and crushing in the subsequent process, there is no adhesion of a foil-like peeled material. In FIG. 8, reference numeral D3 indicates a die that strikes the workpiece 1B as will be described later, and reference numeral N3 indicates a member that presses the workpiece 1B.

More specifically, in the final punching process, a final punching punch P3 having a contour shape smaller than (or the same as) the final punching line 3 is provided in the lower die of the mold, and the die hole is formed in the upper die. peripheral shape are provided with a clearance C _L min only larger die D3 than the last punching scheduled line 3 (see FIG. 10 (a)), the upper die to the work 1B placed on the final punching punch P3 die D3 Is lowered and pressed to hit (see FIG. 10B). After punching by striking, the die D3 is released from the punched and separated workpiece 1C (see FIG. 10C). A member N3 for holding the workpiece 1B is provided in the die hole portion of the upper die D3. Although not shown, the member N3 that holds the work 1B is usually coupled to the back plate to which the die D3 is fixed via a spring body on the upper surface thereof.

The value of the clearance C _L is 'deepest 5a of, 5a' grooves 5,5 so by broken between punching separated, quite large. The value of the clearance _{C L} is to the deepest 5a, 5a 'of the length TG between 90% or more. If it is smaller than 90% of TG, burrs may occur due to shearing rather than breaking.

  Thus, according to the method for manufacturing a press-processed product according to the embodiment of the present invention, the outer peripheral surface 1c of the work 1C obtained through the final punching process, that is, the outer peripheral surface 1c of the work 1C in the press-processed product 1 is used. It is possible to prevent the generation of burrs and adhesion of the foil-like peeled material on the surface 1c ′, the work is efficient, and the work 1C can be prevented from being distorted.

  As mentioned above, although the manufacturing method of the press work goods which concern on embodiment of this invention was demonstrated, this invention is not restricted to what was described in embodiment mentioned above, In the range of the matter described in the claim Various changes are possible. For example, without performing the final punching process (or both the groove forming press process and the final punching process) for the entire final punched line 3, it is desired to prevent the generation of burrs and the adhesion of the foil-like peeled material. It is also possible to carry out only for the part. That is, the fracture surface 6 can be formed only on a part of the outer peripheral surface 1c of the workpiece 1C, that is, the surface 1c 'that is the outer peripheral surface 1c of the workpiece 1C in the press-processed product 1. In this case, the remainder of the outer peripheral surface 1c (surface 1c ') forms a sheared surface.

  Moreover, the shape of the press-work product 1 is not limited to the example shown in FIG. In addition, various processes such as drilling and bending as described above may be included in the process before or after the preliminary punching process, the groove forming press process, and the final punching process.

DESCRIPTION OF SYMBOLS 1 Press work product 1A, 1B, 1C Work piece used as press work product 1Bb Scrap part 1a Work surface 1b Work piece back surface 1c Work piece outer peripheral surface 1c 'Surface which was work piece outer peripheral surface in press work product Line to be punched 4 Alignment hole 5 Groove on work surface 5 'Groove on work back surface 5a, deepest part of 5a' groove 6 Fracture surface TG Length between deepest part of groove part (length of fracture surface)
T _W thickness W _S grooves of the deepest portion from the outer side of the width (the width of the scrap portion)
outer inclination angle C _L clearances deepest portion of inside of the tilt angle φo groove at the deepest portion of φi groove

Claims (9)

A groove forming press step for forming a pair of grooves on the work surface and the work back surface in the separated work so that the deepest part of the groove is along the final punch line.
The final punching step of punching and separating by scraping the scrap part outside the deepest part of the groove part with a clearance and breaking between the deepest parts of the groove part,
The manufacturing method of the press-worked product characterized by including. In the manufacturing method of the press-worked product according to claim 1,
A press-worked product comprising a pre-punching step for shearing and separating a workpiece along a pre-scheduled punching line having a shape substantially enlarged from the final punching line before the groove forming press step. Manufacturing method. In the manufacturing method of the press-worked product according to claim 1 or 2,
The method for manufacturing a press-processed product is characterized in that the cross-sectional shape of the groove part is such that the outer inclination at the deepest part is gentler than the inner inclination. In the manufacturing method of the press-worked product according to any one of claims 1 to 3,
In the groove forming press step, the width outside the deepest portion of the groove is at least longer than the plate thickness.   A press-processed product manufactured by the method for manufacturing a press-processed product according to any one of claims 1 to 4. In the pressed product according to claim 5,
The length of the fracture surface of the central portion of the surface that was the outer peripheral surface of the workpiece is 5 to 30% of the plate thickness. In the pressed product according to claim 5 or 6,
A press-worked product, wherein an inclination angle on both sides of a fracture surface of a central portion of a surface which is an outer peripheral surface of the workpiece is 70 to 90 degrees. In the press work product according to any one of claims 5 to 7,
A press-worked product, wherein rounds are attached to both corners of the surface which was the outer peripheral surface of the workpiece. In the press work product according to any one of claims 5 to 8,
A press-processed product, wherein a fracture surface is formed on all or part of the outer peripheral surface of the workpiece.

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