JP6849212B2 - Manufacturing method of metal parts - Google Patents

Description

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

A metal member having a tubular portion and a plate-shaped portion provided at one end of the base thereof is widely known. Various parts are manufactured by further processing this 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 a metal plate material. As a result, a convex portion is formed on 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 plastic working the convex portion having a hole. As a result, the convex portion becomes a tubular portion. The metal member manufactured in this way has a problem that the thickness of the base portion of the tubular portion tends to be thin. Further, the metal member manufactured in this way has a problem that the portion corresponding to the root portion of the inner peripheral surface of the tubular portion becomes a curved surface having a large radius of curvature.

Patent Document 1 discloses a method for manufacturing a metal member. This method for manufacturing a metal member includes the following two steps. The first step is a semi-processed product in which the tubular 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 face of the cylinder portion of the semi-processed product in a state where at least one of the inner and outer surfaces of the cylinder portion is restrained. In the latter step, a punch and a female mold facing the punch are used. In this step, tubular 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 cylinders on both sides of an opening of a metal plate can be obtained with a relatively small-scale equipment.

Japanese Unexamined Patent Publication No. 11-10275

However, the method for manufacturing a metal member disclosed in Patent Document 1 has a problem that wrinkles 140 are formed between the cylinder portion and the periphery of the base at the base of the cylinder 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 a problem. An object of the present invention is to provide a method for manufacturing a metal member capable of reducing the possibility of wrinkles being formed between a tubular portion and the periphery thereof.

The method for manufacturing the metal member of the present invention will be described with reference to the drawings. It should be noted that the reference numerals in the drawings are used in this column for the purpose of assisting the understanding of the contents of the invention, and are not intended to limit the contents to the illustrated range.

In order to solve the above problems, according to a certain aspect of the present invention, the method for manufacturing a metal member includes a tubular portion forming step S200 and a root thickening step S202. In the tubular portion forming step S200, the tubular portion 110 is formed on a metal plate-like material by plastic working. In the base thickening step S202, the base portion of the tubular portion 110 is thickened. The root thickening step S202 includes an inner peripheral partial moving step S210 and an extrusion step S214. The inner peripheral portion moving step S210, the inner circumferential movement the punch 3 4 moves the front end side inner circumferential portion 120 of the cylindrical portion 110 to the base side inner circumferential portion 122. Extrusion step S214, in a state in which around the base of the inner cylinder portion 110 of the metal plate material is sandwiched between the presser mold 32 and a female 330, pushing punch 3 34 extrusion, the ones of the cylindrical portion 110 The moving portion 130 moved in the peripheral portion moving step S210 is pushed out in the direction opposite to the protruding direction of the tubular portion 110 when viewed from around the base of the tubular portion 110.

In the method for manufacturing a metal member according to the present invention, in the inner peripheral portion moving step S210, the tip side inner peripheral portion 120 of the tubular portion 110 is moved to the root side inner peripheral portion 122. As a result, the inner peripheral portion 122 on the base side of the tubular portion 110 is thickened. The thickened moving portion 130 is pushed out in the direction opposite to the protruding direction of the tubular portion 110. As a result, what was originally the root portion does not have to be extruded, so that the thinning of the root portion due to the root portion of the tubular portion 110 being extruded to the opposite side of the tubular portion 110 is suppressed. Since the thinning is suppressed, the depression of the base portion of the tubular portion 110 due to this is suppressed. As a result, the possibility of wrinkles being formed between the tubular portion 110 and the periphery thereof can be reduced.

Further, the inner moving punch 3 4 described above, the tip section 6 0 disposed distally, it is desirable to have a mobile machining intervals 6 2. Movement processing section 6 2 are disposed on the base side of the inner circumferential movement the punch 3 4 watching the tip section 6 0 or al. Movement processing section 6 2, connected to the distal end section 6 0. Movement processing section 6 2 tip section 6 0 by remote thick. In this case, the inner peripheral partial moving step S210 has the following steps. The process is a process of moving the inner circumferential movement the punch 3 4 more distal end side inner peripheral portion 120 to the mobile processing section 6 2 to the base side inner circumferential portion 122. In this case, it is desirable that the extrusion push-in punch 334 described above has a tip section 360 arranged on the tip side and a moving processing section 362. The moving processing section 362 is arranged on the base side of the extrusion pushing punch 334 when viewed from the tip section 360. The moving processing section 362 is connected to the tip section 360. The moving processing section 362 is thicker than the tip section 360. In this case, the extrusion step S214 has the steps described below. The process is, transfer processing zone of the extrusion push punch 3 34 while the mobile portion 130 is distal ku between 3 60 push the extrusion punch 3 34 that protrude into the internal space of the cylindrical portion 110 is suppressed 3 62 Is a step of pushing out the moving portion 130 in the direction opposite to the protruding direction of the tubular portion 110 when viewed from around the base of the tubular portion 110.

In the inner peripheral portion moving step S210, more distal end side inner peripheral portion 120 to the mobile processing section 6 2 of the inner circumferential movement the punch 3 4 moves into the base side inner circumferential portion 122. Since the inner circumferential movement the punch 3 4 tip section 6 0 move processing section 6 2 more distal end side inner peripheral portion 120 connecting to this not a move, the inner peripheral portion of the cylindrical portion 110 is the inner periphery of the moving punch 3 4 due to being dragged by the tip section 6 0 can be suppressed that the dragged portion resulting in torn. In a state in which the inner circumferential portion of the cylindrical portion 110 torn is suppressed, the movement processing zone between 3 62 extrusion push punch 3 34 watches moving portion 130 from around the base of the cylindrical portion 110 protruding in the cylindrical portion 110 Extrude in the opposite direction. As a result, thinning of the base portion due to the base portion of the tubular portion 110 being pushed out to the opposite side of the tubular portion 110 is suppressed.

Or, that the mobile processing zone between 3 62 extrusion push punch 3 34 described above is a tapered District between 3 70 is tapered, has a constant thickness constant ku between 3 72 thickness desirable. Tapered ku between 3 70 immediately contiguous to the tip ku between 3 60. Thickness constant ku between 3 72 connected to the tip-ku between 3 60 through the tapered ku between 3 70. In this case, the taper-ku between 3 70 extrusion push punch 3 34, in the extrusion step S214, it is desirable to push the opposite side of the moving portion 130 of the cylindrical portion 110 and the projecting direction of the cylindrical portion 110.

Tapered ku between 3 70 extrusion push punch 3 34 When push the moving portion 130 in the extrusion step S214, the moving face of the extrusion push punch 3 34 between the tip ku between 3 60 and the mobile processing zone between 3 62 The shear force applied to the moving portion 130 is smaller than that in the case where the plane is orthogonal to the direction. When the shearing force becomes small, the possibility that the moving portion 130 is torn is reduced as compared with the case where it does not occur. As a result, thinning of the base portion due to the base portion of the tubular portion 110 being pushed out to the opposite side of the tubular portion 110 is suppressed.

Moreover, female 330 described above, the entryway 340 of the push-extrusion punch 3 34 desirably has a recess 342. The recess 342 is arranged at the edge of the approach road 340. The moving portion 130 of the tubular portion 110 is pushed into the recess 342. It is desirable that the root thickening step S202 further includes a pushing step S216. Pushing step S216 is tapered District between 3 70 extrusion push punch 3 34 pushes the moving portion 130 of the tubular portion 110 into the recess 342 of the female 330.

Tapered ku between 3 70 push extruded in pushing step S216 punch 3 34 Engaging moving portion 130 of the tubular portion 110 into the recess 342 of the female 330, the tip-ku between 3 60 and the mobile processing zone between 3 62 compared with the case where the surface between is in a plane perpendicular to the moving direction of the extrusion pushing punch 3 34, likely to be moving portion 130 sheared is reduced by the movement processing zone between 3 62 and the female 330. When the shearing force becomes small, the possibility that the moving portion 130 is torn is reduced as compared with the case where it does not occur. As a result, thinning of the base portion due to the base portion of the tubular portion 110 being pushed out to the opposite side of the tubular portion 110 is suppressed.

According to the method for manufacturing a metal member according to the present invention, the possibility of wrinkles being formed between the tubular portion and the periphery of the base thereof can be reduced.

It is a figure which shows the process which the manufacturing method of the metal member which concerns on one Embodiment of this invention includes. It is external drawing of the semi-processed product which concerns on one Embodiment of this invention. It is a figure which shows the processing state of the inner peripheral part of a cylinder part in the process of moving the inner peripheral part of one Embodiment of this invention. It is a figure which shows the processing state 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 state 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 the pushing process of one Embodiment of this invention is completed. 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 designated by the same reference numerals. Their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[Process description]
FIG. 1 is a diagram showing a process provided by the method for manufacturing a metal member according to the present embodiment. A method for manufacturing a metal member according to the present embodiment will be described with reference to FIG. The method for manufacturing a metal member according to the present embodiment includes a tubular portion forming step S200 and a root thickening step S202. In the case of the present embodiment, the root thickening step S202 includes an inner peripheral partial moving 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 during the process of manufacturing the metal member according to the present embodiment. Based on FIGS. 2 to 6, the specific contents of each step provided in the method for manufacturing the metal member according to the present embodiment will be described.

In the tubular portion forming step S200, a metal plate-like material (not shown) is pressed. As a result, the plate-shaped material becomes the semi-processed 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 out. The semi-processed product 100 includes a tubular portion 110 and a plate-shaped portion 112. The tubular portion 110 is formed by press working in the tubular portion forming step S200. The tubular portion 110 has an inner peripheral portion 120 on the tip side and an inner peripheral portion 122 on the root side. Since the specific method for forming the tubular portion 110 is well known, the detailed description thereof will not be repeated here. The plate-shaped portion 112 is arranged around the base of the tubular portion 110.

In the root thickening step S202, the root portion of the tubular portion 110 of the semi-processed product 100 is thickened by undergoing an inner peripheral portion moving step S210, a shaping step S212, an extrusion step S214, and a pushing step S216. Be transformed. The specific contents of each of these steps are as follows.

FIG. 3 is a diagram showing a processing state of the inner peripheral portion of the tubular portion 110 in the inner peripheral portion moving step S210. In the inner peripheral portion moving step S210, first, among the metal plate-shaped materials that have become the semi-processed product 100, the plate-shaped portion 112 (that is, around the base of the tubular portion 110) is sandwiched between the female mold 30 and the holding mold 32. Is done. Next, in that state, the inner peripheral movement punch 34 is inserted into the tubular portion 110 from the tip end side.

The inner peripheral movement punch 34 is a kind of processing punch. The inner peripheral moving punch 34 has a tip section 60, a moving processing section 62, and a root section 64. The tip section 60 is arranged on the tip side of the inner peripheral movement punch 34. The moving processing section 62 is arranged on the base side of the inner peripheral moving punch 34 when viewed from the tip section 60. The moving processing section 62 is connected to the tip section 60. The moving processing section 62 is thicker than the tip section 60. In the case of the present embodiment, the moving processing section 62 has a tapered section 70 having a tapered shape and a section 72 having a constant thickness. The tapered section 70 is directly connected to the tip section 60. The thickness of the taper section 70 becomes thicker as the distance from the tip section 60 increases. The constant thickness section 72 is connected to the tip section 60 via the taper section 70. The thickness of the constant thickness section 72 is constant. The root section 64 is arranged on the root side of the inner peripheral movement punch 34 when viewed from the movement processing section 62. The root section 64 is connected to the moving processing section 62. The root section 64 is thicker than the moving processing section 62.

When the inner peripheral moving punch 34 is inserted into the inner peripheral moving punch 34 from the tip end side of the tubular portion 110 in the inner peripheral partial moving step S210, the inner peripheral moving punch 34 is moved out of the tubular portion 110 by the moving processing section 62, particularly the tapered section 70. The tip side inner peripheral portion 120 (see FIG. 2) moves to the root side inner peripheral portion 122 (see FIG. 2). As a result, the tip side inner peripheral portion 120 becomes a moving portion 130. After that, the semi-processed product 100 is removed from the female mold 30, the pressing mold 32, and the inner peripheral moving punch 34.

FIG. 4 is a diagram showing a processing state of the inner peripheral portion of the tubular portion 110 in the shaping step S212. In the shaping step S212, first, the plate-shaped portion 112 (that is, around the base of the tubular portion 110) of the semi-processed product 100 is sandwiched between the female mold 230 and the pressing mold 232. Next, the shaping punch 234 enters the tubular portion 110 from the tip end side thereof. The shaping punch 234 shapes the moving portion 130 in the tubular portion 110. After that, the semi-processed product 100 is removed from the female mold 230, the pressing mold 232, and the shaping punch 234.

FIG. 5 is a diagram showing a processing state of the inner peripheral portion of the tubular portion 110 in the extrusion process S214. The extrusion push-in punch 334 used in this step has a tip section 360 and a moving processing section 362. The tip section 360 is arranged on the tip side of the extrusion push-in punch 334. The moving processing section 362 is arranged on the base side of the extrusion pushing punch 334 when viewed from the tip section 360. The moving processing section 362 is connected to the tip section 360. In the case of the present embodiment, the moving processing section 362 has a tapered section 370 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 becomes thicker as the distance from the tip section 360 increases. The constant thickness section 372 is connected to the tip section 360 via the taper 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 this embodiment. On the other hand, the female mold 330 used in this step has an approach path 340 and a recess 342. The extrusion push-in punch 334 enters the approach road 340. The recess 342 is arranged so as to surround the edge of the approach road 340. In the extrusion step S214, first, the plate-shaped portion 112 is sandwiched between the female mold 330 and the pressing mold 332. Next, in that state, the female mold 330 and the pressing mold 332 push the tubular portion 110 into the extrusion pushing punch 334. When the female mold 330 and the pressing mold 332 push the cylinder portion 110 into the extrusion pushing punch 334, the moving portion 130 of the cylinder portion 110 is moved from the plate-shaped portion 112 by the moving processing section 362 of the extrusion pushing punch 334, particularly the taper section 370. As seen, it is pushed out to the side opposite to the protruding direction of the tubular portion 110. As a result, the inner diameter of the tubular portion 110 is made constant. The extruded moving portion 130 enters the recess 342 of the female mold 330. During that time, the tip section 360 of the extrusion pushing punch 334 suppresses the moving portion 130 from projecting into the internal space of the tubular portion 110.

FIG. 6 is a diagram showing a processing state of the inner peripheral portion of the tubular portion 110 after the completion of the pushing step S216. In the pushing step S216, as the female mold 330 and the pressing mold 332 push the cylinder portion 110 into the extrusion pushing punch 334, the tapered section 370 of the extrusion pushing punch 334 moves the moving portion 130 of the cylinder portion 110 to the female mold 330. Push it into the recess 342 of. As a result, the moving portion 130 is shaped. By the shaping, the semi-processed product 100 becomes a finished product. The finished product is removed from the female die 330, the presser die 332 and the extrusion push punch 334.

[Explanation of effect]
In the method for manufacturing a metal member according to the present embodiment, the pre-thickened moving portion 130 is extruded to the side opposite to the protruding direction of the tubular portion 110. As a result, thinning of the base portion due to the base portion of the tubular portion 110 being pushed out to the opposite side of the tubular portion 110 is suppressed. Since the thinning is suppressed, the depression of the base portion of the tubular portion 110 due to this is suppressed. As a result, the possibility that wrinkles 140 are formed between the tubular portion 110 and the periphery thereof can be reduced.

The method of manufacturing a metal member according to the present embodiment is more distal end side inner peripheral portion 120 to the mobile processing section 6 2 of the inner circumferential movement the punch 3 4 moves into the base side inner circumferential portion 122. Since the inner circumferential movement the punch 3 4 tip section 6 0 move processing section 6 2 more distal end side inner peripheral portion 120 connecting to this not a move, the inner peripheral portion of the cylindrical portion 110 is the inner periphery of the moving punch 3 4 due to being dragged by the tip section 6 0 can be suppressed that the dragged portion resulting in torn. As a result, thinning of the base portion due to the base portion of the tubular portion 110 being pushed out to the opposite side of the tubular portion 110 is suppressed.

In the method for producing a metal member according to the present embodiment, if the surface between the tip ku between 3 60 and the mobile processing zone between 3 62 is in a plane perpendicular to the moving direction of the extrusion pushing punch 3 34 The shearing force applied to the moving portion 130 is smaller than that of the moving portion 130. When the shearing force becomes small, the possibility that the moving portion 130 is torn is reduced as compared with the case where it does not occur.

In the method for manufacturing a metal member according to the present embodiment, the possibility that the moving portion 130 is sheared between the moving processing section 362 and the female mold 330 is lower than in the case described below. In that case, the surface between the tip section 360 and the moving processing section 362 is a flat surface orthogonal to the moving direction of the extrusion pushing punch 334. This is because in the pushing step S216, the tapered section 370 of the extrusion pushing punch 334 pushes the moving portion 130 of the tubular portion 110 into the recess 342 of the female mold 330. When the shearing force becomes small, the possibility that the moving portion 130 is torn is reduced as compared with the case where it does not occur.

[Explanation of modified example]
The embodiments disclosed this time are exemplary in all respects. The scope of the present invention is not limited based on the embodiments described above. 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 root thickening step S202 does not have to have the pushing step S216.

Further, the processing punch is not limited to the above-mentioned one . The machining punch used in the present invention does not have to have a tapered tip section and a moving machining section connected to the tip section.

30, 230, 330 ... Female type 32, 232, 332 ... Holding type 34 ... Inner circumference moving punch 40 ... Approach road 42 ... Recessed portion 60, 360 ... Tip section 62, 362 ... Moving processing section 64 ... Root section 70, 370 ... Tapered sections 72, 372 ... Constant thickness section 100 ... Semi-processed product 110 ... Cylinder part 112 ... Plate-shaped 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)

The cylinder part forming process of forming a cylinder part on a metal plate-like material by plastic working,
A method for manufacturing a metal member including a base thickening step for thickening the base portion of the tubular portion.
The root thickening step
The inner peripheral movement punch moves the inner peripheral portion on the tip side of the tubular portion to the inner peripheral portion on the root side, and the inner peripheral portion moving step.
The extrusion pushing punch is moved in the inner peripheral portion moving step of the tubular portion in a state where the base of the tubular portion of the metal plate-shaped material is sandwiched between the female mold and the pressing mold. A method for manufacturing a metal member having an extrusion step of extruding a portion in a direction opposite to the protruding direction of the tubular portion when viewed from around the base of the tubular portion. The inner circumference moving punch
The tip section placed on the tip side and
It is connected to the tip section, is arranged on the root side when viewed from the tip section, and has a moving processing 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 inner peripheral moving punch.
The extrusion push-in punch
The tip section placed on the tip side and
It is connected to the tip section, is arranged on the root side when viewed from the tip section, and has a moving processing section thicker than the tip section.
While the tip section of the extrusion push punch suppresses the moving portion from projecting into the internal space of the cylinder portion in the extrusion step, the moving processing section of the extrusion push punch makes the moving portion of the cylinder portion. The method for manufacturing a metal member according to claim 1, further comprising a step of extruding the tubular portion in a direction opposite to the protruding direction when viewed from around the base of the portion. The moving processing section of the extrusion pushing punch is
A tapered section that is directly connected to the tip section and has a tapered shape,
It has a constant thickness section that is continuous with the tip section via the taper section and has a constant thickness.
The metal member according to claim 2, wherein the tapered section of the extrusion pushing punch pushes the moving portion of the cylinder portion to a side opposite to the protruding direction of the cylinder portion in the pushing step. Production method. The female type
The approach path of the extrusion push punch and
It is arranged at the edge of the approach path and has a recess in which the moving portion of the tubular portion is pushed.
The third aspect of claim 3, wherein the root thickening step further includes a pushing step in which the tapered section of the extrusion pushing punch further pushes the moving portion of the tubular portion into the female recess. A method for manufacturing a metal member.

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