JP2018083215A - Manufacturing method of metallic member - Google Patents

Abstract

An object of the present invention is to reduce the possibility that wrinkles are formed between a cylinder part and the periphery of the base part.
A method for manufacturing a metal member includes a tube forming step S200 and a base thickening step S202. The cylinder part forming step S200 forms a cylinder part on a metal plate-like material. In the base thickening step S202, the base portion of the tube portion is thickened. The base thickening step S202 includes an inner peripheral partial movement step S210 and an extrusion step S214. In the inner peripheral portion moving step S210, the machining punch moves the tip side inner peripheral portion of the cylindrical portion to the root side inner peripheral portion. In the extruding step S214, the machining punch moves the moving part moved in the inner peripheral part moving step S210 of the cylindrical part while the periphery of the cylindrical part is sandwiched between the female mold and the pressing mold. Extrude to the opposite side to the protruding direction of the tube part as seen from around.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a metal member.

  A metal member including a tube portion and a plate-like portion provided at one end of the base is widely known. Various parts are manufactured by further processing the member. Such a metal member is manufactured by subjecting a metal plate material to plastic working. An example of the manufacturing method includes the following three steps. The first step is a step of drawing the metal plate material. Thereby, a convex part is formed in the plate material. The second step is a step of making a hole at the tip of the convex portion. The third step is a step of performing plastic working on the projecting portion having a hole. Thereby, the convex part becomes a cylindrical part. The metal member manufactured in this way has a problem that the thickness of the base portion of the cylindrical portion tends to be thin. Moreover, the metal member manufactured in this way has a problem that a portion corresponding to the root portion of the inner peripheral surface of the cylindrical portion becomes a curved surface having a large curvature radius.

  Patent document 1 discloses the manufacturing method of metal members. This method for manufacturing a metal member includes the following two steps. The first step is a step of forming a semi-processed product in which the cylindrical portion protrudes from one side of the opening of the metal plate material by drawing, drilling, and drawing. The second step is a step of pressing the end surface of the cylinder part of the semi-processed product in a state where at least one of the inner and outer surfaces of the cylinder part is constrained. In the latter step, a punch and a female die facing the punch are used. In this step, cylindrical portions are formed on both sides of the metal plate material. According to the method for manufacturing a metal member disclosed in Patent Document 1, a product having cylindrical portions on both sides of an opening of a metal plate material can be obtained with a relatively small-scale facility.

JP-A-11-10275

  However, the metal member manufacturing method disclosed in Patent Document 1 has a problem in that wrinkles 140 are formed between the tube portion and the periphery of the tube portion at the base of the tube portion. FIG. 7 is a conceptual diagram of such a wrinkle 140. Such wrinkles reduce the strength of the metal member.

  The present invention solves such problems. An object of the present invention is to provide a method for manufacturing a metal member that can reduce the possibility that wrinkles are formed between the cylindrical portion and the periphery of the base portion.

  The manufacturing method of the metal member of this invention is demonstrated with reference to drawings. Note that the use of the reference numerals in the figure in this column is intended to assist understanding of the contents of the invention, and is not intended to limit the contents to the illustrated range.

  In order to solve the above problems, according to an aspect of the present invention, a method for manufacturing a metal member includes a tube portion forming step S200 and a root thickening step S202. In the cylindrical portion forming step S200, the cylindrical portion 110 is formed on a metal plate material by plastic working. In the base thickening step S202, the base portion of the cylindrical portion 110 is thickened. The base thickening step S202 includes an inner peripheral partial movement step S210 and an extrusion step S214. In the inner peripheral portion moving step S <b> 210, the machining punches 34 and 334 move the tip side inner peripheral portion 120 of the cylindrical portion 110 to the root side inner peripheral portion 122. In the extrusion step S214, the processing punches 34 and 334 are arranged on the inner periphery of the cylindrical portion 110 in a state where the periphery of the cylindrical portion 110 of the metal plate material is sandwiched between the female die 330 and the pressing die 32. The moving part 130 moved in the partial moving step S <b> 210 is pushed out to the side opposite to the protruding direction of the cylindrical part 110 when viewed from around the base of the cylindrical part 110.

  In the metal member manufacturing method according to the present invention, the tip side inner peripheral portion 120 of the cylindrical portion 110 is moved to the base side inner peripheral portion 122 in the inner peripheral portion moving step S210. Thereby, the base side inner peripheral part 122 of the cylinder part 110 is thickened. The moving part 130, which is a thickened part, is pushed out to the side opposite to the protruding direction of the cylindrical part 110. Thereby, since what was originally a root part does not need to be extruded, the thinning of the root part resulting from the root part of the cylinder part 110 being pushed out to the opposite side of the cylinder part 110 is suppressed. Since the thinning is suppressed, the depression of the base portion of the cylindrical portion 110 due to this is suppressed. As a result, it is possible to reduce the possibility that wrinkles are formed between the cylindrical portion 110 and the periphery of the base portion.

  Moreover, it is desirable that the processing punches 34 and 334 described above have the tip sections 60 and 360 disposed on the tip side and the moving processing sections 62 and 362. The moving machining sections 62 and 362 are arranged on the base side of the machining punches 34 and 334 when viewed from the tip sections 60 and 360. The moving machining sections 62 and 362 are connected to the tip sections 60 and 360. The moving machining sections 62 and 362 are thicker than the tip sections 60 and 360. In this case, the inner peripheral partial moving step S210 includes the steps described below. This step is a step of moving the tip side inner peripheral portion 120 to the root side inner peripheral portion 122 by the moving processing sections 62 and 362 of the processing punches 34 and 334. In this case, the extrusion step S214 includes the following steps. In the process, the moving processing sections 62 and 362 of the processing punches 34 and 334 move while the tip sections 60 and 360 of the processing punches 34 and 334 prevent the moving portion 130 from protruding into the internal space of the cylindrical portion 110. This is a step of extruding the portion 130 to the side opposite to the protruding direction of the cylindrical portion 110 when viewed from around the base of the cylindrical portion 110.

  In the inner peripheral portion moving step S <b> 210, the tip side inner peripheral portion 120 moves to the root side inner peripheral portion 122 by the moving processing sections 62 and 362 of the processing punches 34 and 334. Since the front end side inner peripheral portion 120 is moved not by the front end sections 60 and 360 of the processing punches 34 and 334 but by the moving processing sections 62 and 362 connected thereto, the inner peripheral portion of the cylindrical portion 110 is the front end section of the processing punches 34 and 334. It can be suppressed that the dragged part is torn off due to dragging by 60,360. In a state where the inner peripheral portion of the cylindrical portion 110 is prevented from being broken, the moving processing sections 62 and 362 of the processing punches 34 and 334 are projected in the protruding direction of the cylindrical portion 110 when the moving portion 130 is viewed from around the root of the cylindrical portion 110. Extrude to the opposite side. Thereby, thinning of the base part resulting from the base part of the cylinder part 110 being pushed out to the opposite side of the cylinder part 110 is suppressed.

  Alternatively, it is desirable that the moving processing sections 62 and 362 of the above-described processing punches 34 and 334 include tapered sections 70 and 370 having a tapered shape and constant thickness sections 72 and 372 having a constant thickness. . The tapered sections 70 and 370 are directly connected to the tip sections 60 and 360. The constant thickness sections 72 and 372 are connected to the tip sections 60 and 360 through the tapered sections 70 and 370. In this case, it is desirable that the taper sections 70 and 370 of the processing punches 34 and 334 push the moving portion 130 of the cylindrical portion 110 to the side opposite to the protruding direction of the cylindrical portion 110 in the extrusion step S214.

  When the taper sections 70, 370 of the machining punches 34, 334 push out the moving part 130 in the extrusion step S214, the surface between the tip sections 60, 360 and the moving machining sections 62, 362 is in the moving direction of the machining punches 34, 334. The shearing force applied to the moving part 130 is smaller than when the plane is orthogonal. When the shearing force is reduced, the possibility that the moving part 130 is torn off is lower than in the case where the shearing force is not reduced. Thereby, thinning of the base part resulting from the base part of the cylinder part 110 being pushed out to the opposite side of the cylinder part 110 is suppressed.

  Further, it is desirable that the above-described female mold 330 has an entry path 340 for the machining punches 34 and 334 and a recess 342. The recess 342 is disposed at the edge of the approach path 340. The moving part 130 of the cylindrical part 110 is pushed into the concave part 342. It is desirable that the base thickening step S202 further includes a pressing step S216. In the pushing step S <b> 216, the taper sections 70 and 370 of the processing punches 34 and 334 push the moving part 130 of the cylindrical part 110 into the concave part 342 of the female die 330.

  When the taper sections 70 and 370 of the machining punches 34 and 334 push the moving portion 130 of the cylindrical portion 110 into the concave portion 342 of the female die 330 in the pushing step S216, the space between the tip sections 60 and 360 and the moving machining sections 62 and 362 is reached. Compared with the case where the surface is a plane orthogonal to the moving direction of the processing punches 34 and 334, the possibility that the moving part 130 is sheared by the moving processing sections 62 and 362 and the female die 330 is reduced. When the shearing force is reduced, the possibility that the moving part 130 is torn off is lower than in the case where the shearing force is not reduced. Thereby, thinning of the base part resulting from the base part of the cylinder part 110 being pushed out to the opposite side of the cylinder part 110 is suppressed.

  According to the method for manufacturing a metal member according to the present invention, it is possible to reduce the possibility that wrinkles are formed between the cylindrical portion and the base thereof.

It is a figure which shows the process with which the manufacturing method of the metal member concerning one Embodiment of this invention is provided. It is an external view of the semi-processed product concerning one Embodiment of this invention. It is a figure which shows the processing condition of the inner peripheral part of the cylinder part in the inner peripheral part movement process of one Embodiment of this invention. It is a figure which shows the processing condition of the inner peripheral part of the cylinder part in the shaping process of one Embodiment of this invention. It is a figure which shows the processing condition of the inner peripheral part of the cylinder part in the extrusion process of one Embodiment of this invention. It is a figure which shows the inner peripheral part of the cylinder part after completion | finish of the pushing process of one Embodiment of this invention. It is a conceptual diagram which shows an example of a wrinkle.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Description of process]
Drawing 1 is a figure showing a process with which a manufacturing method of a metallic member concerning this embodiment is provided. Based on FIG. 1, the manufacturing method of the metal member concerning this embodiment is demonstrated. The manufacturing method of the metal member concerning this embodiment is provided with cylinder part formation process S200 and root thickening process S202. In the case of the present embodiment, the base thickening step S202 includes an inner peripheral partial movement step S210, a shaping step S212, an extrusion step S214, and a pushing step S216.

  2 to 6 are views of the mold and the semi-processed product 100 in the middle of the method for manufacturing the metal member according to the present embodiment. Based on FIG. 2 thru | or FIG. 6, the specific content of each process with which the manufacturing method of the metal member concerning this embodiment is provided is demonstrated.

  In the cylinder part forming step S200, a metal plate-like material (not shown) is pressed. Thereby, the plate-shaped raw material becomes the semi-finished product 100 of the metal member according to the present embodiment. FIG. 2 is an external view of the semi-processed product 100 according to the present embodiment. In FIG. 2, a part of the semi-processed product 100 is cut away. The semi-processed product 100 includes a cylindrical part 110 and a plate-like part 112. The cylindrical part 110 is formed by press working in the cylindrical part forming step S200. The cylinder part 110 has a tip side inner peripheral part 120 and a root side inner peripheral part 122. Since a specific method for forming the cylindrical portion 110 is well known, detailed description thereof will not be repeated here. The plate-like part 112 is arranged around the base of the cylinder part 110.

  In the base thickening step S202, the base portion of the cylindrical portion 110 of the semi-processed product 100 is thickened through the inner peripheral portion moving step S210, the shaping step S212, the extrusion step S214, and the pressing step S216. It becomes. The specific contents of each of these steps are as follows.

  FIG. 3 is a diagram illustrating a processing state of the inner peripheral portion of the cylindrical portion 110 in the inner peripheral partial moving step S210. In the inner peripheral portion moving step S210, first, the plate-like portion 112 (that is, around the base of the tube portion 110) of the metal plate-like material that has become the semi-processed product 100 is sandwiched between the female die 30 and the holding die 32. It is. Next, in this state, the inner peripheral movement punch 34 is inserted into the cylindrical portion 110 from the distal end side thereof.

  The inner periphery moving punch 34 is a kind of processing punch. The inner peripheral movement punch 34 has a tip section 60, a moving machining section 62, and a root section 64. The leading end section 60 is disposed on the leading end side of the inner peripheral movement punch 34. The moving machining section 62 is arranged on the base side of the inner peripheral moving punch 34 when viewed from the tip section 60. The moving machining section 62 is continuous with the tip section 60. The moving machining section 62 is thicker than the tip section 60. In the case of this embodiment, the moving machining section 62 has a tapered section 70 that is tapered and a constant thickness section 72. The taper section 70 is directly connected to the tip section 60. The thickness of the taper section 70 increases as the distance from the tip section 60 increases. The constant thickness section 72 continues to the tip section 60 via the tapered section 70. The thickness of the constant thickness section 72 is constant. The root section 64 is arranged on the base side of the inner peripheral movement punch 34 when viewed from the moving machining section 62. The root section 64 continues to the moving machining section 62. The root section 64 is thicker than the moving machining section 62.

  In the inner peripheral partial moving step S210, when the inner peripheral moving punch 34 is inserted into the cylindrical portion 110 from the distal end side thereof, the moving processing section 62 of the inner peripheral moving punch 34, particularly the taper section 70, causes the cylindrical section 110 to move. The front end side inner peripheral portion 120 (see FIG. 2) moves to the root side inner peripheral portion 122 (see FIG. 2). Thereby, the front end side inner peripheral portion 120 becomes the moving portion 130. Thereafter, the semi-processed product 100 is removed from the female die 30, the holding die 32, and the inner peripheral movement punch 34.

  FIG. 4 is a diagram illustrating a processing state of the inner peripheral portion of the cylindrical portion 110 in the shaping step S212. In the shaping step S <b> 212, first, the plate-like portion 112 (that is, around the base of the cylindrical portion 110) of the semi-processed product 100 is sandwiched between the female die 230 and the pressing die 232. Next, the shaping punch 234 enters the cylindrical portion 110 from the distal end side thereof. The shaping punch 234 shapes the moving part 130 in the cylinder part 110. Thereafter, the semi-processed product 100 is removed from the female die 230, the pressing die 232, and the shaping punch 234.

  FIG. 5 is a diagram illustrating a processing state of the inner peripheral portion of the cylindrical portion 110 in the extrusion step S214. The extrusion push punch 334 used in this step has a tip end section 360 and a moving processing section 362. The leading end section 360 is disposed on the leading end side of the extrusion push punch 334. The moving process section 362 is disposed on the base side of the extrusion push punch 334 when viewed from the tip section 360. The moving machining section 362 continues to the tip section 360. In the case of the present embodiment, the moving machining section 362 includes a tapered section 370 that is tapered and a constant thickness section 372. The taper section 370 is directly connected to the tip section 360. The thickness of the taper section 370 increases as the distance from the tip section 360 increases. The constant thickness section 372 continues to the tip section 360 through the tapered section 370. The thickness of the constant thickness section 372 is constant. The constant thickness section 372 is thicker than the tip section 360. The extrusion push punch 334 is a kind of processing punch used in the present embodiment. On the other hand, the female mold 330 used in this process has an approach path 340 and a recess 342. The extrusion push punch 334 enters the entry path 340. The concave portion 342 is arranged at the edge of the approach path 340 so as to surround it. In the extrusion step S <b> 214, first, the plate-like portion 112 is sandwiched between the female die 330 and the pressing die 332. Next, in this state, the female die 330 and the holding die 332 push the cylindrical portion 110 into the push-pushing punch 334. When the female die 330 and the holding die 332 push the cylindrical portion 110 into the extrusion pressing punch 334, the moving portion 130 of the cylindrical portion 110 is moved from the plate-like portion 112 by the moving processing section 362 of the extrusion pressing punch 334, particularly the taper section 370. It is pushed out to the side opposite to the protruding direction of the cylindrical portion 110 when viewed. As a result, the inner diameter of the cylindrical portion 110 is made constant. The extruded moving part 130 enters the recess 342 of the female mold 330. Meanwhile, the tip section 360 of the push-push punch 334 prevents the moving part 130 from protruding into the internal space of the cylindrical part 110.

  FIG. 6 is a diagram illustrating a processing state of the inner peripheral portion of the cylindrical portion 110 after the pressing step S216 is completed. In the pushing step S216, as the female die 330 and the holding die 332 push the cylindrical portion 110 into the extrusion pressing punch 334, the taper section 370 of the extrusion pressing punch 334 causes the moving portion 130 of the cylindrical portion 110 to move to the female die 330. Is pushed into the recess 342. Thereby, the moving part 130 is shaped. The semi-processed product 100 becomes a finished product by the shaping. The finished product is removed from the female die 330, the pressing die 332, and the extrusion pressing punch 334.

[Description of effects]
In the method for manufacturing a metal member according to the present embodiment, the moving part 130 that has been thickened in advance is pushed out to the side opposite to the protruding direction of the cylindrical part 110. Thereby, thinning of the base part resulting from the base part of the cylinder part 110 being pushed out to the opposite side of the cylinder part 110 is suppressed. Since the thinning is suppressed, the depression of the base portion of the cylindrical portion 110 due to this is suppressed. As a result, it is possible to reduce the possibility that the wrinkles 140 are formed between the cylindrical portion 110 and the periphery of the base portion.

  In the metal member manufacturing method according to the present embodiment, the tip side inner peripheral portion 120 moves to the root side inner peripheral portion 122 by the moving processing sections 62 and 362 of the processing punches 34 and 334. Since the front end side inner peripheral portion 120 is moved not by the front end sections 60 and 360 of the processing punches 34 and 334 but by the moving processing sections 62 and 362 connected thereto, the inner peripheral portion of the cylindrical portion 110 is at the front ends of the processing punches 34 and 334. It can suppress that the dragged part is torn off due to being dragged. As a result, thinning of the base portion due to the root portion of the cylindrical portion 110 being pushed out to the opposite side of the cylindrical portion 110 is suppressed.

  In the metal member manufacturing method according to the present embodiment, when the surfaces between the tip sections 60 and 360 and the moving processing sections 62 and 362 are planes orthogonal to the moving direction of the processing punches 34 and 334. In comparison, the shearing force applied to the moving part 130 is reduced. When the shearing force is reduced, the possibility that the moving part 130 is torn off is lower than in the case where the shearing force is not reduced.

  In the metal member manufacturing method according to the present embodiment, the possibility that the moving part 130 is sheared between the moving processing section 362 and the female mold 330 is lower than in the case described below. In this case, the surface between the tip section 360 and the moving machining section 362 is a plane perpendicular to the moving direction of the extrusion push punch 334. This is because the taper section 370 of the push push punch 334 pushes the moving portion 130 of the cylindrical portion 110 into the recess 342 of the female die 330 in the push step S216. When the shearing force is reduced, the possibility that the moving part 130 is torn off is lower than in the case where the shearing force is not reduced.

[Description of modification]
The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiment. Of course, various design changes may be made without departing from the spirit of the present invention.

  For example, the female mold 330 may have an approach path 340 having a large inner diameter instead of having the recess 342. In this case, the base thickening step S202 may not include the pressing step S216.

  Further, the processing punch is not limited to that described above. The processing punch may be any punch that can perform at least one of the following two steps. One of these steps is a step of moving the tip side inner peripheral portion 120 of the cylindrical portion 110 to the root side inner peripheral portion 122. The other of these steps is a step of pushing the distal end side inner peripheral portion 120 moved to the base side inner peripheral portion 122 of the cylindrical portion 110 to the side opposite to the protruding direction of the cylindrical portion 110. Therefore, for example, one type of processing punch may be used for both the inner peripheral partial movement step S210 and the extrusion step S214. The processing punch used in the present invention may not have a tapered tip end section and a moving processing section connected to the tip end section.

30, 230, 330 ... female mold 32, 232, 332 ... holding mold 34 ... inner peripheral movement punch 40 ... entry path 42 ... recess 60, 360 ... tip section 62, 362 ... moving machining section 64 ... root section 70, 370 ... Tapered section 72, 372 ... constant thickness section 100 ... semi-processed product 110 ... cylindrical part 112 ... plate-like part 120 ... tip side inner peripheral part 122 ... root side inner peripheral part 130 ... moving part 140 ... wrinkle 234 ... shaping punch 334 ... Extrusion push punch

Claims (4)

A cylindrical portion forming step of forming a cylindrical portion in a metal plate-like material by plastic working;
A method of manufacturing a metal member comprising a base thickening step of thickening a base portion of the cylindrical portion,
The root thickening step is
An inner peripheral part moving step in which the working punch moves the inner peripheral part on the tip side to the base inner peripheral part of the cylindrical part,
In the state in which the periphery of the base of the cylindrical portion is sandwiched between the female die and the pressing die in the metal plate-shaped material, the processing punch moves in the inner peripheral portion moving step in the cylindrical portion. A method for manufacturing a metal member, comprising: an extruding step of extruding a portion to a side opposite to a protruding direction of the tube portion when viewed from around the base of the tube portion. The processing punch is
A tip section disposed on the tip side;
Continuing from the tip section, arranged on the base side as seen from the tip section, and having a moving machining section thicker than the tip section,
The inner peripheral portion moving step includes a step of moving the tip side inner peripheral portion to the root side inner peripheral portion by the moving processing section of the processing punch,
The moving process section of the machining punch controls the moving part of the cylinder part while the extruding step suppresses the tip section of the machining punch from protruding the moving part to the internal space of the cylinder part. 2. The method for manufacturing a metal member according to claim 1, further comprising a step of extruding to a side opposite to a protruding direction of the cylindrical portion when viewed from around the base. The moving machining section of the machining punch is
A tapered section that is directly connected to the tip section and is tapered;
A constant thickness section with a constant thickness connected to the tip section via the tapered section;
3. The metal member manufacturing method according to claim 2, wherein the taper section of the machining punch pushes out the moving portion of the cylindrical portion to a side opposite to a protruding direction of the cylindrical portion in the extruding step. Method. The female mold is
An approach path for the machining punch;
It has a recessed part which is arranged at an edge of the approach path and the moving part is pushed into the cylindrical part,
4. The metal according to claim 3, wherein the base thickening step further includes a pressing step in which the taper section of the processing punch presses the moving portion of the cylindrical portion into the concave portion of the female die. The manufacturing method of a member made.

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