JP2009045661A - Sheared article, shearing method and shearing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform deburring without causing dimensional change, the generation of projection and the like to a sheared article which is a product. <P>SOLUTION: A recessed housing part 11e is formed in the vicinity of a burr generating position of a workpiece M by allowing a punch 2 with a projection-like forming part 2a formed on the peripheral edge to press against the workpiece M, and deburring is performed so that burrs 11d generated by shearing is housed in the housing part 11e while being bent to the side of the housing part 11e. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheared product by pressing, a shearing method, and a shearing tool, and in particular, a sheared product in which burrs generated by shearing are deburred, a shearing method for deburring burrs generated by shearing, and The present invention relates to a shearing tool that enables deburring of burrs generated by shearing.

  For example, when a product is manufactured by shearing a steel plate as a workpiece by pressing, burrs are generated in the sheared product. This burr is formed in a state of protruding from one surface of the sheared product (the surface on which the punching punch abuts), and is not only unnecessary but also an obstacle when using the sheared product as a product. For this reason, after press working, deburring treatment is performed to remove burrs from the sheared product by belt polishing or barrel polishing. However, since such a deburring process must be performed in a process different from the press process, the cost increases and additional processing time is required. For this reason, the technique which can perform a shear and a deburring process in the press work process was calculated | required. Here, the deburring process is to perform some processing / processing so that the burr does not get in the way, and includes things other than removing (removing) the burr.

And the technique of performing a shear and a deburring process with one press metal mold | die with respect to such a request | requirement is known (for example, refer patent document 1). This technique performs deburring in a progressive die by crushing burrs formed in a punching (punching) step with a pressing die. In addition, a technique is known in which a groove is formed in advance on a surface of a workpiece where burrs are formed, and the generation of burrs is eliminated by punching the groove portion with a punch (see, for example, Patent Document 2). .
Japanese Patent Laid-Open No. 2002-066652 Japanese Patent Laid-Open No. 05-042330

  Incidentally, in recent years, the shape of products manufactured by press working has become complicated (composite processing), and the processing accuracy of products has been required to be extremely high. For example, a round unit component used in an adjuster mechanism for a reclining seat of an automobile has a plurality of complex uneven surfaces and gear teeth, and each part has extremely high dimensional accuracy and geometric accuracy (flatness and verticality). Degree). Furthermore, since it must slide and rotate in combination with other parts, there should be no slight protrusions on the functional surfaces such as the sliding surface and the contact surface.

  When such a technique as described in Patent Documents 1 and 2 is applied to a product that has a complicated shape and requires high accuracy, the request cannot be met. That is, in the technique described in Patent Document 1, deburring is performed by crushing burrs. For this reason, the crushed burrs become surplus (remaining material) and protrude from the surface on the burr side that is almost perpendicular to the shearing surface (cut surface) or dimensional accuracy or geometric accuracy required. . Such protrusion of the excess thickness changes geometric accuracy and dimensional accuracy such as flatness and perpendicularity after shearing, and further forms protrusions on the functional surface of the product, so that it does not meet the required specifications as a product. It will also be. Moreover, in the technique described in the above-mentioned Patent Document 2, it is possible to eliminate the generation of burrs by forming grooves in advance, but in practice, burrs are generated from the bottom of the grooves, and in another process. Deburring is required.

  Therefore, an object of the present invention is to provide a sheared product, a shearing method, and a shearing tool that can be deburred without giving a dimensional change or generation of protrusions to the sheared product as a product.

  In order to achieve the above object, according to the first aspect of the present invention, a concave accommodating portion is formed in the vicinity of a burr generated by shearing, and the burr is bent toward the accommodating portion and accommodated in the accommodating portion. It is a sheared product characterized by being deburred.

  According to a second aspect of the present invention, in the sheared product according to the first aspect, the accommodating portion is formed so as to cut out a corner portion between the burr-side surface and the shearing surface, and the shearing portion side of the accommodating portion The burrs formed from the edge of each are housed in the housing portion.

  The invention according to claim 3 is a shearing method for shearing a workpiece and deburring a burr generated by the shearing, wherein a concave accommodating portion is formed in the vicinity of the burr occurrence position of the workpiece. The burr generated by shearing is bent toward the storage portion and stored in the storage portion.

  The invention according to claim 4 is the shearing method according to claim 3, wherein the workpiece is pressed by pressing a shearing tool having a convex shaped part formed on the periphery thereof against the workpiece. A housing part is formed and the workpiece is sheared.

  According to a fifth aspect of the present invention, in the shearing method according to the fourth aspect, after the concave relief portion is formed at the receiving portion forming position of the workpiece to which the forming portion of the shearing tool abuts, the shearing method is performed. The housing portion is formed and the shearing is performed by a tool.

  The invention according to claim 6 is a shearing tool for shearing a workpiece, in order to accommodate a burr of a sheared product sheared from the workpiece at a peripheral edge of a tip surface that comes into contact with the workpiece. A convex shaped part for forming the concave accommodating part in the sheared product is formed.

  According to the first aspect of the present invention, since the deburring process is performed in a state where the burr is accommodated in the concave accommodating portion, there is no dimensional change or generation of protrusions on the sheared product. That is, since the burr which is the surplus of the sheared product (work material) is accommodated in the accommodating portion, the surplus (burr) does not protrude from the shear surface or the burr side surface. As a result, geometric accuracy and dimensional accuracy due to shearing are maintained, and no protrusions are generated.

  According to the invention described in claim 2, since the burr is formed from the edge on the shearing surface side of the accommodating portion, the burr is lower than the surface on the burr side that is substantially perpendicular to the shearing surface (the surface in contact with the shearing tool). Burr is generated from the position on the inner side. For this reason, in the state where the burr is accommodated in the accommodating portion, the surplus (burr) is more unlikely to protrude from the shear surface or the burr side surface.

  According to the third aspect of the present invention, since the burr generated by shearing is housed in the concave housing portion and deburred, the sharable product is not subjected to dimensional change or generation of protrusions. That is, since the burr which is the surplus of the sheared product (work material) is accommodated in the accommodating portion, the surplus (burr) does not protrude from the shear surface or the burr side surface. As a result, geometric accuracy and dimensional accuracy due to shearing can be maintained, and no protrusions are generated.

  According to invention of Claim 4 and 6, in order to perform formation and shearing of an accommodating part with the shear tool by which the convex-shaped shaping | molding part was formed in the periphery, a concave accommodating part is formed in a workpiece (shear goods). And a burr is formed from the edge of the housing portion on the shear surface side. That is, since burrs are generated from a position lower than the burr side surface substantially perpendicular to the shear plane, surplus (burrs) may protrude from the shear plane or the burr side surface in a state where the burrs are accommodated in the accommodating portion. Is less.

  According to the fifth aspect of the present invention, since the storage portion is formed and sheared after the concave relief portion is formed at the storage portion formation position of the workpiece, excessive impact force or Generation | occurrence | production of concentrated stress can be suppressed and breakage, wear, etc. of a shear tool can be prevented and suppressed.

  The present invention will be described below based on the illustrated embodiments.

  1 and 2 are a plan view of a sheared product 1 according to an embodiment of the present invention and an AA cross-sectional view thereof. The sheared product 1 is a round unit used in an adjuster mechanism for a reclining seat of an automobile. It is a part.

  The sheared product 1 is formed and sheared by press working as described later with a steel plate as a work material M, and is located on the inner side of the ring-shaped outer ring portion 11 and the outer ring portion 11 and protrudes from one surface of the outer ring portion 11. The disc-shaped inner circle portion 12 is integrated. Further, an internal gear 11 a in which gear teeth are continuously formed is formed on the inner peripheral surface of the outer ring portion 11, and a center hole 12 a is formed in the central portion of the inner circle portion 12. Since such a sheared product 1 is used as an adjuster mechanism for a reclining seat integrally with other components, high dimensional accuracy and geometric accuracy are required. That is, not only the internal gear 11a but also the outer surface (shear surface) 11b of the outer ring portion 11 which is a functional surface (contact surface) and the burr-side surface 11c perpendicular to the outer surface 11b are dimensional accuracy and geometric accuracy. Highly demanded.

  For this reason, the burr due to the shear should not remain from the burr side surface 11c of the outer ring portion 11 while remaining sharp, and it becomes a surplus when the burr is crushed, resulting in the outer peripheral surface 11b and the burr side. Must not protrude from the surface 11c. Due to such requirements, the sheared product 1 is deburred as follows. That is, as shown in FIG. 3, a concave accommodating portion 11e is formed in the vicinity of the burr 11d caused by shear (adjacent to the burr 11d), and the burr 11d is bent toward the accommodating portion 11e and accommodated in the accommodating portion 11e. The deburring process has been performed. More specifically, the accommodating portion 11e is formed so as to cut out a corner portion 11f formed by the burr-side surface 11c and the outer peripheral surface 11b, and the burr 11d is formed from the edge of the accommodating portion 11e on the outer peripheral surface 11b side. Is formed. That is, the burr 11d is generated from the position on the inner side (material side) lower than the burr-side surface 11c. Then, the burr 11d is accommodated in the accommodating part 11e in a bent state in a curled shape, and the extra burr 11d is formed on the same surface of the burr side surface 11c from the same surface of the outer peripheral surface 11b. It does not protrude from.

  Next, a manufacturing method (shear processing method) of the sheared product 1 having such a configuration will be described. Here, in this embodiment, it is assumed that the sheared product 1 is manufactured in a plurality of steps (stages) using one progressive die. In addition, since high dimensional accuracy and geometric accuracy are required as described above, it is manufactured by fine blanking (precision shearing).

  First, as shown in FIG. 4, a relief portion M <b> 1 is formed at the accommodation portion forming position of the workpiece M with which a forming portion 2 a of a punch (shearing tool) 2 described later contacts. As shown in FIG. 5, the relief portion M <b> 1 has a V-shaped (concave) cross section and is formed along the outer peripheral surface 11 b of the sheared product 1. That is, along the contour (circular in the case of the sheared product 1) of the outer peripheral surface 2b so that the outer peripheral surface (blade surface) 2b of the punch 2 forming the outer peripheral surface 11b of the sheared product 1 and the center of the V shape coincide with each other. Thus, the relief part M1 is formed. Specifically, the coining block 3 having the convex coining portion 3a to which the relief portion M1 to be formed is transferred is disposed in the mold, and the coining portion 3a is pressed against the workpiece M, The relief part M1 is formed.

  Next, as shown in FIG. 6, the concave accommodating portion 11 e is formed in the vicinity of the burr generation position of the workpiece M, and the workpiece M is sheared. Here, in this embodiment, in order to produce the sheared product 1 as described above, it is necessary to project the inner circle portion 12 from the outer ring portion 11 to form the internal gear 11a and the center hole 12a. Since these formations (molding) are not directly related to the deburring process, description thereof is omitted here. Note that the inner circle portion 12 and the internal gear 11a may be formed in a step before shearing the outer shape (outer peripheral surface 11b) of the workpiece M, or may be performed in the same step as shearing.

  As shown in FIG. 5, the punch 2 that shears the workpiece M to form the outer peripheral shape of the sheared product 1 has a housing portion as described above at the entire outer peripheral edge of the tip surface 2 c that contacts the workpiece M. A forming portion 2a for forming 11e on the workpiece M is formed. The molding portion 2a is a convex shape protruding from the front end surface 2c toward the workpiece M, and its size, that is, the width W1 and the height H1 from the front end surface 2c are accommodation portions formed by the molding portion 2a. When the burr 11d as described above is bent and accommodated in 11e, the burr 11d (surplus) does not protrude from the outer peripheral surface 11b or the burr-side surface 11c and does not affect other parts such as deformation. Is set. Further, based on the size of the molded part 2a, the opening width W2 from the center of the V shape of the cross-sectional shape of the relief part M1 is set larger than the width W1 of the molded part 2a, and the V of the relief part M1 is set. The character depth H2 is set to be larger than the height H1 of the molding portion 2a. That is, when the front end surface 2c of the punch 2 comes into contact with the workpiece M, the molding portion 2a can enter the escape portion M1 without receiving a large stress or impact force.

  And such a punch 2 is arrange | positioned in a metal mold | die, and while the punch 2 is pressed to the workpiece M, the accommodating part 11e is formed in the workpiece M (shear goods 1), and also a workpiece Punch the sheared product 1 from M. That is, by pressing the punch 2 against the workpiece M, as shown in FIG. 7, the punch 2 enters the workpiece M, the punch 2 side of the escape portion M1 is crushed, and the workpiece M becomes It will be in the state contact | adhered to the front end surface 2c of the punch 2, and the shaping | molding part 2a, and, thereby, the accommodating part 11e is formed. Further, the workpiece M is sheared by the punch 2 and the die 4, and when the punch 2 is pushed into the die 4, the sheared product 1 is punched from the workpiece M.

  In the state in which the sheared product 1 is punched in this way, as shown in FIG. 8, it is formed from a burr-side surface 11c with which the tip surface 2c of the punch 2 is in contact and an outer peripheral surface 11b which is a shear surface. An accommodating portion 11e is formed so as to cut out the corner portion 11f. An elongated burr 11d is formed so as to extend from the edge on the outer peripheral surface 11b side of the accommodating portion 11e, that is, from an inner position lower than the burr-side surface 11c, on an extension of the outer peripheral surface 11b. Further, in this embodiment, the tip of the burr 11d protrudes from the burr-side surface 11c, although it depends on the material of the workpiece M and the clearance (gap) between the punch 2 and the die 4.

  Subsequently, the burr 11d is bent toward the accommodating portion 11e and accommodated in the accommodating portion 11e, and deburred. Specifically, the burr 11d is bent and deburred by a deburring punch 5 as shown in FIG. The deburring punch 5 is substantially disc-shaped, and a concave pocket 5a for accommodating the sheared product 1 is formed on the bottom side. The pocket 5a has a circular planar shape, and an inner angle 5b that comes into contact with the burr 11d in a state where the sheared product 1 is accommodated is formed in an R shape (arc shape) as shown in FIG. Then, the shearing product 1 is accommodated in the pocket 5a, and the deburring punch 5 is pressed toward the base plate 6 in a state where the shearing product 1 is sandwiched between the deburring punch 5 and the base plate 6. As a result, the burr 11d of the sheared product 1 is pressed by the inner corner 5b of the pocket 5a, bent into a curl shape following the shape of the inner corner 5b, and accommodated in the accommodating portion 11e.

  Here, the shape of the inner corner 5b is set so that the burr 11d can be bent into a desired shape and accommodated in the accommodating portion 11e. A concave relief hole 5c is formed above the inner corner 5b. When the deburring punch 5 is pressed toward the base plate 6, the burr-side surface 11c hits the deburring punch 5 and the sheared product 1 is not deformed. It is like that. Further, the pocket 5a is formed in a conical shape (tapered shape) narrowing from the lower side (base plate 6 side) to the upper side, and the sheared product 1 is easily accommodated in the pocket 5a, and the outer peripheral surface 11b is the inner peripheral surface of the pocket 5a. It is designed not to deform when hit. With such a shape and configuration, only the burr 11d is pressed against the inner corner 5b of the pocket 5a, and deformation, scratches, etc. are prevented from occurring in other parts such as the outer peripheral surface 11b and the burr side surface 11c. ing.

  According to the sheared product 1 having the above-described configuration, the excess burr 11d does not protrude from the outer peripheral surface 11b and the burr-side surface 11c which are functional surfaces and require high dimensional accuracy and geometric accuracy. Since the other portions are accommodated in the accommodating portion 11e without being affected by deformation or the like, the geometric accuracy and dimensional accuracy due to shearing are maintained.

  In addition, according to the manufacturing method as described above, the burr 11d generated by shearing is accommodated in the accommodating part 11e and deburred, so that the sheared product 1 as a product is subjected to deformation, generation of protrusions, dimensional change, and the like. There is nothing. That is, the burr 11d is generated from a position lower than the burr-side surface 11c, and the burr 11d is accommodated from the outer peripheral surface 11b or the burr-side surface 11c in order to accommodate the burr 11d in the accommodating portion 11e. There is nothing to do. Furthermore, since the accommodation portion 11e is formed and sheared after the relief portion M1 is formed at the accommodation portion formation position of the workpiece M, excessive impact force or concentrated stress is generated in the molding portion 2a of the punch 2. It is possible to suppress and prevent the punch 2 from being damaged or worn. In addition, since the shearing and deburring treatment is performed in one press mold in the press working process, it is a matter of course that productivity can be improved and manufacturing cost can be reduced.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the accommodating portion 11e is formed and sheared simultaneously by the punch 2 (in the same step). However, the accommodating portion 11e is formed in the previous step, and in the subsequent steps, the forming portion is formed. You may make it shear while maintaining the shape of the accommodating part 11e by 2a. Alternatively, when the accommodating portion 11e is not deformed (not crushed) by shearing depending on the material of the workpiece M or the like, after the accommodating portion 11e is formed, the flat punch 2 having no molding portion 2a is used to perform shearing. It may be.

  Further, in the above embodiment, the accommodating portion 11e is formed so as to cut out the corner portion 11f of the sheared product 1, and the burr 11d is generated from a position on the inner side lower than the burr-side surface 11c. The following may be performed depending on the required geometric accuracy and the allowable degree of protrusion. That is, the burr 11d is generated from the same position as the burr-side surface 11c, and the burr 11d is placed in the accommodating portion 11e formed adjacent to (in the vicinity of the burr generation position). It may be bent and housed. Furthermore, although the sheared product 1 is manufactured with one progressive mold, it may be manufactured using a plurality of molds by a transfer press, and can be applied to general shearing processing other than fine blanking. Of course. Further, depending on the material and required life of the punch 2 or the material of the workpiece M, the accommodation portion 11e may be formed and sheared by the punch 2 without forming the escape portion M1.

  As described above, the sheared product, the shearing method, and the shearing tool according to the present invention are extremely useful as those that can be deburred without giving a dimensional change or generation of protrusions to the sheared product that is a product.

It is a top view of the sheared product which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is an outer peripheral part enlarged view of the outer ring | wheel part of the sheared goods of FIG. It is a figure which shows the step which forms a relief part in the shearing method which concerns on embodiment of this invention. It is a figure which shows the cross-sectional shape of the relief part formed at the step of FIG. 4, the shape of the shaping | molding part of a punch (the B section detail of FIG. 6), and those positional relationship. It is a figure which shows the step which performs formation and shearing of an accommodating part in the shearing method which concerns on embodiment of this invention. It is a figure which shows the cross-sectional state in the middle of the shear in the step of FIG. It is an outer peripheral part enlarged view of the outer ring | wheel part of the sheared product sheared by the step of FIG. It is a figure which shows the step which bends a burr | flash and accommodates in a accommodating part in the shearing method which concerns on embodiment of this invention. FIG. 10 is an enlarged view (detailed view of a portion C in FIG. 9) showing the shape of the inner corner of the pocket of the deburring punch used in the step of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shear goods 11 Outer ring part 11a Internal gear 11b Outer peripheral surface (shear surface)
11c Burr side surface 11d Burr (remaining thickness)
11e accommodation part 11f corner part 12 inner circle part 2 punch (shear tool)
2a Molding part 2b Outer peripheral surface (blade surface)
2c End face 3 Coining block 3a Coining part 4 Die 5 Deburring punch 5a Pocket 5b Inner corner 6 Base plate M Work material M1 Relief part

Claims (6)

  A sheared product characterized in that a concave accommodating portion is formed in the vicinity of a burr generated by shearing, and the deburring is performed in a state where the burr is bent toward the accommodating portion and accommodated in the accommodating portion.   The accommodating portion is formed so as to cut out the corner portion between the burr side surface and the shear surface, and the burr formed from the edge of the accommodating portion on the shear surface side is accommodated in the accommodating portion. The sheared product according to claim 1, wherein: A shearing method for shearing a workpiece and deburring burrs generated by shearing,
Forming a concave accommodating portion in the vicinity of the burr occurrence position of the workpiece,
A shearing method characterized in that burrs generated by shearing are bent toward the storage portion and stored in the storage portion.   The shearing tool in which a convex shaped part is formed on a peripheral edge is pressed against the workpiece, thereby forming the accommodating portion on the workpiece and shearing the workpiece. 3. The shearing method according to 3.   The forming of the receiving portion and the shearing are performed by the shearing tool after forming a concave relief portion at the receiving portion forming position of the workpiece to which the forming portion of the shearing tool abuts. 4. The shearing method according to 4. A shearing tool for shearing a workpiece,
A convex molding part is formed on the peripheral edge of the front end surface in contact with the workpiece to form a concave accommodating portion for accommodating the burrs of the sheared product sheared from the workpiece. A shearing tool characterized by

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