JP2006312190A - Forging device, and forging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forging device and a forging method where, in a forging stage, regarding a stock having burrs such as cutting marks, the marks of the burrs left after its forming can be removed or suppressed without damaging a formed shape in the conventional forging stage. <P>SOLUTION: Regarding the forging device where a punch 2 and a die 3 arranged so as to be confronted movably to relatively approaching/separating directions are provided, and these are made to approach, thus a cutting material 50 set between the punch 2 and the die 3 is compressed to the inside of a forming space composed of the punch 2 and the die 3, so as to be formed into a prescribed shape, a surface area expanding means where, in the stage of making the punch 2 and the die 3 to approach, a part of a compression face 3a forming the forming space is temporarily projected to the inside of the forming space, and the surface area of the stock to be compressively deformed is temporarily expanded is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a forging device and a forging method for forming a material into a predetermined shape by forging, and more particularly to a forging device and a forging method suitable for use in forging a material having burrs such as cut marks.

  Conventionally, in various metal products and the like, forging is performed in which a metal material or the like that has been heated to a high temperature is compressed into a predetermined shape by being compressed with a fixed die. In this forging, there is a method in which a cut material obtained by cutting a material such as a cast bar cast so as to have a cross-sectional shape close to a projected shape of a product is forged, and a method of manufacturing a final forged product is employed.

  In this way, when forging a cutting material obtained from a material such as a cast bar, black skin in the material such as a burr and a cast bar such as a cut mark generated at the end of the cut surface of the material in the cutting process (not processed, casting In some cases, a skin portion where a structure different from the inside of the material is formed is caught in the material in the forging process, or may remain on the surface or inside of the product after forging. Such burrs and skins reduce the strength and surface accuracy of the product, and cause the elongation of the material in the forging process to decrease. For this reason, various techniques for preventing burrs and black skin from remaining on the material to be forged have been proposed. For example, Patent Document 1 discloses the following technique. In other words, in this document, when forging a product with a warped and three-dimensionally complicated shape, the end of the material jumps up and the black skin is easily caught inside the product. In the previous forging process, by giving a certain amount of warpage to the material in advance, the black skin is prevented from getting inside the product.

  By the way, as described above, the burr which is a cut mark generated at the end of the cut surface of the material in the cutting process is, for example, a fixed rod-like or linear material 60 such as a heated metal as shown in FIG. Occurs when cutting to a predetermined length using the blade 41 and the moving blade 42 to obtain a cutting material 50 as a material to be forged. In this case, the material 60 penetrating the fixed blade 41 is sequentially fed out so as to protrude from the surface 41 a of the fixed blade 41, and the length of the protruding portion is set to a predetermined length by the sizing stopper 43. When the moving blade 42 moves along the surface 41a of the fixed blade 41 with the material 60 protruding by a predetermined length, the protruding portion is pressed and cut in one direction (downward in FIG. 6). The Thereby, a columnar cutting material 50 having a predetermined length is obtained as a material to be forged.

Then, the cutting material 50 shown in FIG. 7A obtained in the cutting step is formed into a rough ground shape as shown in FIG. Forged to be formed into a finished shape as shown in c).
In the wasteland forming step, the cutting material 50 was formed into the wasteland shape by a forging device 101 as shown in FIG. The forging device 101 includes a punch 102 and a die 103 that are opposed to each other so as to be movable in a relatively close and separable direction. Then, it is compressed into a molding space constituted by the punch 102 and the die 103 and molded into a predetermined shape. That is, as shown in FIG. 8A, the cutting material 50 is set on the die 103 so that the cut surface 50 a on one side thereof is in contact with the compression surface 103 a of the die 103. When the punch 102 is lowered from this state, the cutting material 50 is compressed in the axial direction and formed into a rough ground shape. 8 (b), the molding space formed by the compression surface 102a of the punch 102 and the compression surface 103a of the die 103 becomes the rough ground shape, and the cutting material 50 is in the molding space. By being compressed, the cutting material 50 is formed into a rough ground shape shown in FIG.
The raw material formed into this rough shape is compressed by a punch and a die in the same manner in the finish forming step, and formed into a finished shape as shown in FIG.
JP 2004-42107 A

As described above, the cutting material 50 cut in the cutting process is formed into a wasteland shape (see FIG. 7B) in the wasteland forming process by the forging device 101, and then finished in the finish forming process (see FIG. ))), The following problems may occur.
That is, in the cutting process as shown in FIG. 6, the material 60 is cut by moving the moving blade 42 in one direction along the surface 41 a of the fixed blade 41 with respect to the material 60 protruding from the fixed blade 41. Therefore, a cutting stress is applied to the heated material 60 having viscosity, and a burr 50b remains as a cutting trace at the end portion (peripheral portion) of the cut surface 50a.

As described above, the cutting material 50 having the burr 50b on the cutting surface 50a is formed into a rough ground shape in the rough ground forming step as described above from the state where the cutting surface 50a is set so as to contact the compression surface 103a of the die 103. When it is molded, a burr mark 50c may be generated near the bottom surface in the wasteland shape. That is, the burr 50b generated in the cutting process is wound near the surface of the material or inside the material in the compression process by the punch 102 and the die 103 in the rough ground forming process, and remains as a burr mark 50c after the forming.
Further, the burr mark 50c generated in the waste land forming process may remain as it is in the finish forming process (see FIG. 7C).

The burr mark 50c remaining after finish molding is a burr mark when the generated position is a part (black skin part) where surface processing such as cutting is not performed, such as a groove part 50d as shown in FIG. The trace 50c remains in the product as it is. The burr mark 50c remaining on the product causes a reduction in product strength depending on the generation position, depth, size, and the like.
Here, it is conceivable to perform surface processing such as cutting on the black skin portion, but this is difficult because a lathe needs to be added and the cost is increased.
On the other hand, it is conceivable to add a processing step for removing burrs after cutting the material in the cutting step, but this also causes a problem of cost increase, and it is necessary to enlarge the space.

  Therefore, in view of the above-described problems of the prior art, the present invention removes and suppresses burrs that remain after molding of a material having burrs such as cutting marks in the forging process without impairing the molding shape in the conventional forging process. It is in the point which provides the forging apparatus and forging method which can be performed.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, according to the first aspect of the present invention, an upper die and a lower die that are opposed to each other so as to be relatively movable toward and away from each other are provided, and a material set between the upper die and the lower die by bringing them close to each other. Is a forging device that compresses a mold into a molding space constituted by the upper mold and the lower mold to form a predetermined shape, and forms a compression surface in the process in which the upper mold and the lower mold approach each other. Is provided with a surface area expanding means for temporarily protruding a part of the material into the molding space and temporarily expanding the surface area of the material to be compressed and deformed.

  The surface area enlarging means according to claim 2, wherein the surface area enlarging means includes a projecting punch provided such that a tip portion can project from the compression surface of the lower mold or the upper mold so as to be movable in the approaching / separating direction; And a moving means for moving the upper mold.

  According to a third aspect of the present invention, the tip end portion of the protruding punch is shaped to follow the peripheral shape of the protruding punch arrangement side end surface of the material set between the upper mold and the lower mold.

  In claim 4, an upper mold and a lower mold that are arranged opposite to each other so as to be relatively movable toward and away from each other, and by bringing them close to each other, a material set between the upper mold and the lower mold, A forging method in which a mold is compressed into a predetermined space formed by an upper mold and a lower mold, and is molded into a predetermined shape. The part is temporarily protruded into the molding space, and the surface area of the material to be compressed and deformed is temporarily expanded.

  In claim 5, the upper mold and the lower mold, which are opposed to each other so as to be relatively movable toward and away from each other, are brought close to each other, thereby compressing the material set between the upper mold and the lower mold into a rough ground shape. Formed into the waste land shape set between the upper mold and the lower mold by bringing the upper mold and the lower mold, which are disposed opposite to each other so as to be relatively movable in the proximity and separation direction, to the waste land forming step to be molded. A forging method comprising forming a material into a finished shape, and an end face of the material set between the upper die and the lower die in the material formed into the wasteland shape in the wasteland forming step. A recess is formed by recessing a portion corresponding to the finish-shaped groove, and in the finish forming step, the recess is further recessed to form the groove.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, the burrs of the material can be removed within one process in the forging process without impairing the molding shape in the conventional forging process, and the burr marks remaining after forging are removed and suppressed. Can do.

  According to the second aspect, the surface area at a desired position can be enlarged with respect to the material set between the upper mold and the lower mold with a simple configuration. Thereby, the burr | flash which a raw material has can be removed effectively, and the burr | flash trace which remains after forging can be removed and suppressed effectively.

  In Claim 3, since the surface area of the burr | flash part generate | occur | produced in the peripheral part of the end surface of the raw material to be forged can be expanded reliably, the burr | flash trace which remains after forge molding can be removed and suppressed more effectively. it can.

  In claim 4, the burrs of the material can be removed within one process in the forging process without losing the molding shape in the conventional forging process, and the burrs remaining after forging are removed and suppressed. Can do.

  In claim 5, since the surface area of the burr portion of the material or the burr mark portion after the waste land molding can be increased by changing the shape of the compression surface of the material in the waste land forming step and the finish forming step. The burr marks remaining after forging can be removed and suppressed in a simple and desired position.

Next, embodiments of the invention will be described.
First, a forging device 1 according to the present invention will be described with reference to FIG.
The forging device 1 includes a punch 2 as an upper die and a die 3 as a lower die that are opposed to each other so as to be relatively close to and away from each other. The material to be set (cutting material 50) is compressed into a molding space constituted by the punch 2 and the die 3 and molded into a predetermined shape.
That is, the cutting material 50 obtained in the cutting process as shown in FIG. 6 described above is formed into a final product shape through a forging process such as a rough ground forming process or a finish forming process in which the forging device 1 according to the present invention is used. Is done.
In the present embodiment, the lower die 3 is configured as a fixed die arranged in a fixed state, and the upper die 2 is configured as a movable die arranged so as to be movable up and down. .

The die 3 is provided on a base plate 4 having a substantially U shape in cross section as shown in FIG. 1 via a spacer 5 and a mounting flange 6, and a base portion 31 that is a plate-like member constituting a substantially horizontal plane, And a side portion 32 which is fixed on the base portion 31 and configured in a substantially cylindrical shape. The compression surface 3 a that forms the molding space is formed by the upper surface of the base portion 31 and the inner surface of the side portion 32. The punch 2 is provided so as to be movable in the proximity and separation direction with respect to the die 3, that is, in the present embodiment, can be moved up and down with respect to the die 3.
The punch 2 is formed in a substantially cylindrical shape, and the lower surface thereof is a compression surface 2 a that forms the molding space, and is provided in a state where the compression surface 2 a is opposed to the compression surface 3 a of the die 3.
That is, the punch 2 and the die 3 are arranged in a state where the respective compression surfaces 2a and 3a face each other, and when the punch 2 descends, a molding space is formed together with the die 3, and the die 3 is formed in the molding space. The cutting material 50 set on the top is compressed and formed into a predetermined shape.

In this embodiment, the lower end portion of the punch 2 is partially fitted to the upper end portion of the side portion 32 of the die 3 in the lowered end state, and the compression surface 2a of the punch 2 and the die 3 are in this state. A molding space is formed by the compression surface 3a.
Then, the cutting material 50 obtained in the cutting step is set on the die 3 so that the end surface (cut surface 50a) on one side thereof is in contact with the compression surface 3a of the die 3, and the punch 2 descends to cut The material 50 is compressed into the molding space and molded into a predetermined shape.

The forging device 1 according to the present invention temporarily protrudes a part of the compression surface for forming the forming space into the forming space in the process in which the punch 2 and the die 3 are close to each other, that is, the process in which the punch 2 is lowered. And surface area expanding means for temporarily expanding the surface area of the material to be compressed and deformed.
That is, as described above, the burr 50b generated in the cutting material 50 in the cutting process remains as a burr mark 50c even after a forging process such as a rough ground forming process or a finish forming process. It is thought that this is because the enlargement ratio of the surface area of the material necessary to do this cannot be ensured properly, so that the surface area in the vicinity of the burr 50b is temporarily enlarged in the compression process in which the punch 2 descends. The burr 50b is assimilated with the other part of the material to prevent the burr 50b from remaining as a burr mark 50c after forging.

  In this way, by providing the forging device 1 with the surface area expanding means, it remains after forming a material having burrs such as cutting marks in one process in the forging process without impairing the forming shape in the conventional forging process. Burr marks can be removed and suppressed. Hereinafter, the surface area expanding means will be specifically described.

  The surface area expanding means provided in the forging device 1 according to the present invention includes a projecting punch 11 provided such that the tip portion can project from the compression surface 3 a of the die 3 so as to be movable in the vertical direction, and the projecting punch 11 is formed in the die 3. And a moving means for moving it.

The protruding punch 11 penetrates the base plate 4 in the vertical direction and is provided so as to be slidable in the vertical direction with respect to the unloader 12 constituting a part of the compression surface 3a of the die 3 via the spacer 5. That is, below the dice 3, the base plate 4, which is substantially U-shaped in cross-section, forms a storage space for the protruding punch 11 together with the spacer 5, while securing a place for extending the unloader 12 at the base 31 of the dice 3. The unloader 12 configured in a substantially columnar shape penetrates the storage space in the vertical direction, and the upper surface of the unloader 12 covers a part of the compression surface 3a of the die 3. Constitute.
And the protrusion punch 11 comprised in the substantially cylindrical shape is slidably provided with respect to the unloader 12 comprised in the substantially column shape.

That is, a storage space for the projecting punch 11 is formed by the base plate 4 having a substantially U-shape in a side sectional view, the spacer 5, and the hole 31a provided in the base 31 of the die 3, and penetrates the storage space in the vertical direction. The protruding punch 11 is penetrated with respect to the carry-out device 12 to be slidable in the vertical direction. When the protruding punch 11 is stored in the storage space, the tip end portion of the protruding punch 11 is interposed between the unloader 12 and the base 31 in the hole 31a of the base 31. The tip portion constitutes a part of the compression surface 3 a of the die 3.
In this way, the protruding punch 11 is provided such that its tip end portion can move in the vertical direction so as to protrude from the compression surface 3 a of the die 3. The storage space for the projecting punch 11 formed by the base plate 4, the spacer 5, and the hole 31a of the base 31 of the die 3 constitutes a hydraulic chamber filled with hydraulic oil, as will be described later. And the substantially enclosed space is constituted with the projecting punch 11.

As described above, the storage space of the protruding punch 11 that is a substantially sealed space is filled with the hydraulic oil of the protruding punch 11, and the storage space is formed by the enlarged diameter portion 11 a formed on the side surface of the protruding punch 11. The upper hydraulic chamber 13a and the lower hydraulic chamber 13b are partitioned. That is, the enlarged diameter portion 11 a of the protruding punch 11 is formed so as to be in sliding contact with the inner surface of the base plate 4, and the volumes of the upper hydraulic chamber 13 a and the lower hydraulic chamber 13 b change as the protruding punch 11 moves up and down.
Further, the spacer 5 protrudes inward from the inner surface of the base plate 4 in the storage space, and the upper surface 11b of the enlarged diameter portion 11a of the protruding punch 11 abuts on the lower surface 5a of the protruding portion of the spacer 5, Ascent of the protruding punch 11 is restricted.

That is, in the lowered end state of the projecting punch 11 as shown in FIG. 1 and the like, the projecting punch 11 has its lower surface 11 c abutting against the bottom surface 4 a of the internal space of the base plate 4 and its upper end portion being compressed by the die 3. A part of the surface 3a is formed. In the raised end state of the protruding punch 11 (see FIG. 2C), the upper surface 11b of the enlarged diameter portion 11a of the protruding punch 11 is in contact with the lower surface 5a of the protruding portion of the spacer 5, and its tip The part protrudes from the compression surface 3 a of the die 3.
That is, the distance between the upper surface 11b of the enlarged diameter portion 11a and the lower surface 5a of the spacer 5 in the lowered end state of the projecting punch 11 is a distance in which the projecting punch 11 can move in the vertical direction. Of the die 3 protrudes upward from the compression surface 3 a of the die 3.

  An upper hydraulic pipe 14a communicates with the upper hydraulic chamber 13a, and a lower hydraulic pipe 14b communicates with the lower hydraulic chamber 13b, and these are shown via these hydraulic pipes 14a and 14b. The hydraulic pressure is supplied from the hydraulic tank to the hydraulic chambers 13a and 13b. In the present embodiment, the upper hydraulic pipe 14a penetrates the mounting flange 6 and the spacer 5 and communicates with the upper hydraulic chamber 13a, and the lower hydraulic pipe 14b penetrates the base plate 4 and communicates with the lower hydraulic chamber 13b. is doing.

These hydraulic pipes 14a and 14b are connected to a hydraulic tank via a hydraulic valve (switching valve) and a hydraulic pump (not shown), and the upper hydraulic chamber 13a and the lower hydraulic chamber are controlled by controlling the hydraulic valves. The hydraulic pressure is selectively supplied to one hydraulic chamber 13b and the oil is discharged from the other hydraulic chamber.
That is, when the hydraulic pressure is supplied from the lower hydraulic pipe 14b to the lower hydraulic chamber 13b and the hydraulic oil is discharged from the upper hydraulic chamber 13a through the upper hydraulic pipe 14a, the protruding punch 11 rises, and conversely, the upper hydraulic pressure When hydraulic pressure is supplied from the piping 14a to the upper hydraulic pressure chamber 13a and hydraulic fluid is discharged from the lower hydraulic pressure chamber 13b through the lower hydraulic pressure piping 14b, the protruding punch 11 is lowered.

With such a configuration, the protruding punch 11 is provided so as to be movable with respect to the die 3. That is, a configuration for moving the protruding punch 11, that is, a hydraulic supply configuration such as a hydraulic pump (not shown) including the unloader 12, the upper and lower hydraulic chambers 13a and 13b, and the upper and lower hydraulic pipes 14a and 14b communicating with these hydraulic chambers. However, this is the moving means of the protruding punch 11 in this embodiment.
The moving means of the projecting punch 11 is not limited to this embodiment, and may be configured using various actuators such as solenoids and urging members such as springs.

  Forging is performed by the following forging method using the forging apparatus 1 configured as described above. That is, in the process in which the punch 2 is lowered, the protruding punch 11 is temporarily raised, so that a part of the compression surface 3a of the die 3 forming the forming space is temporarily protruded into the forming space and is compressed and deformed. Temporarily increase the surface area of the material. Hereinafter, this will be specifically described with reference to FIG.

First, before the molding shown in FIG. 2A, the cutting material 50 having the burr 50 b obtained in the cutting process is such that the cutting surface 50 a located at the peripheral edge of the lower end of the cutting material 50 is the compression surface of the die 3. It is set so as to touch 3a. Prior to the start of molding, the punch 2 is in the raised end state, and the protruding punch 11 is in the lowered end state.
Here, the cutting material 50 is set so that the part of the burr 50 b generated at the end (peripheral edge) of the cut surface 50 a is positioned at the upper end of the protruding punch 11.

  Next, as shown in FIG. 4B, when the forming is started and the punch 2 starts to descend, the cutting material 50 starts to be compressed and deformed. In this process, when the substantially cylindrical cutting member 50 is compressed in the axial direction, it is expanded and deformed in the lateral direction, and the position of the burr 50 b is kept at the position of the upper end of the protruding punch 11.

When the punch 2 further descends and the cutting material 50 is further compressed and deformed as shown in FIG. 5C, at a certain point in the process of the punch 2 descending, the lower hydraulic pipe 14b is used. The hydraulic pressure is supplied to the lower hydraulic chamber 13b, and the hydraulic oil in the upper hydraulic chamber 13a is discharged through the upper hydraulic piping 14a, whereby the protruding punch 11 is raised.
As a result, the compression surface 3a of the die 3 is temporarily protruded, and the burr 50b portion of the cutting material 50 is pushed into the material to be compressed and deformed, the surface area of the portion is enlarged, and the burr 50b portion is made of the material. It is assimilated with other parts and removed. That is, when the tip of the projecting punch 11 is pushed into the material to be compressed and deformed, the surface area of the material is enlarged and the burr 50b is removed as shown by the arrow in the material in the figure.

  Thereafter, as shown in FIG. 4D, the punch 2 is in the lowered end state, and a forming space is formed by the compression surface 2a of the punch 2 and the compression surface 3a of the die 3, and the protruding punch 11 is lowered. That is, as described above, after the projecting punch 11 is projected in the process of lowering the punch 2, the hydraulic pressure is supplied to the upper hydraulic pressure chamber 13a through the upper hydraulic pressure piping 14a as the punch 2 enters the lowered end state. When the hydraulic oil in the lower hydraulic chamber 13b is discharged through the lower hydraulic pipe 14b, the protruding punch 11 is lowered. Thereby, a raw material is compressed in the said shaping | molding space, and shaping | molding is completed.

  By forging the cutting material 50 by the forging method using the forging apparatus 1 as described above, the burr 50b of the cutting material 50 is obtained in one process in the forging process without impairing the molding shape in the conventional forging process. Can be removed. Thereby, the burr | flash mark which remains after forge molding can be removed and suppressed.

  Further, by configuring the surface area expanding means with the protruding punch 11 and the moving means described above, the surface area at a desired position can be expanded with respect to the material set between the punch 2 and the die 3 with a simple structure. Can do. Thereby, the burr | flash 50b of the cutting material 50 can be removed effectively, and the burr | flash trace which remains after forging can be removed and suppressed effectively.

Further, as in this embodiment, the protruding punch 11 is configured in a substantially cylindrical shape, and the cutting surface of the cutting material 50 on the side where the protruding punch 11 is disposed of the cutting material 50 whose tip is set on the compression surface 3a of the die 3 By making the shape along the peripheral shape of 50a, in the cutting material 50, the surface area of the burr 50b portion generated at the peripheral portion of the cut surface 50a can be reliably expanded, so that the burr mark remaining after forging is formed. It can be removed and suppressed more effectively.
Here, even if it is a case where a moving means is comprised without using the unloader 12, and it is not necessary to comprise the protrusion punch 11 in a substantially cylindrical shape, only the part which protrudes from the compression surface 3a of this protrusion punch 11 is cut | disconnected. By making the shape along the peripheral edge of the cut surface 50a of the material 50, the same effect can be obtained.

  Note that in the forging device 1 described above, the die 3 in which the portion of the compression surface that temporarily protrudes into the molding space in the process of the punch 2 and the die 3 being in proximity is constituted by the tip of the protruding punch 11. However, the present invention is not limited to this. For example, a protruding punch that protrudes downward with respect to the punch 2 is provided on the punch 2 side, or a protruding punch is provided. It can also be set as the structure which protrudes the other part of the compression surface which forms shaping | molding space by making it the structure which protrudes from the side in the compression surface 3a of the die | dye 3. FIG. In other words, the protruding punch is not limited to the lower die 3 and may be provided so as to be movable so as to protrude from the compression surface of the upper die 2. Depending on the position and shape of the cutting surface 50a of the cutting material 50 set in the above, the position corresponding to the burr portion can be appropriately configured.

Moreover, the burr | flash 50b of the cutting material 50 can also be removed also by the following forging methods, and the burr | flash trace which remains after forge molding can be removed and suppressed.
That is, in this forging method, as shown in FIG. 3, after forming the cutting material 50 having the burr 50b shown in FIG. 3 (a) into the rough ground forming shape shown in FIG. In the final molding process, the burr marks are removed and suppressed in a stepwise manner in the process of forming the final molded shape shown in FIG.

  Specifically, this forging method changes the rough shape shown in FIG. 3B to the rough shape shown in FIG. 3B from the forming shape in each step of the conventional forging step shown in FIG. This is performed by the waste land forming step shown in FIG. 4 and the finish forming step shown in FIG.

In the wasteland forming step shown in FIG. 4, the wasteland punch 72 and the wasteland punch 72 as an upper die and a wasteland die 73 as a lower die, which are disposed facing each other so as to be relatively movable in the proximity and separation directions, are brought close to each other. The raw material (cutting material 50) set between the wasteland dies 73 is compressed and formed into a wasteland shape shown in FIG.
That is, the wasteland punch 72 is provided so as to be able to move in the proximity and separation direction with respect to the wasteland die 73, that is, in the present embodiment, can be moved up and down with respect to the wasteland die 73, and these wasteland punch 72 and wasteland die 73 are provided. However, each of the compression surfaces 72a and 73a are arranged in opposition to each other, and when the wasteland punch 72 descends, a wastewater die 73 and a wastewater shape forming space are formed, and the wasteland die 73 is formed in the molding space. The cutting material 50 set on top is compressed and formed into a wasteland shape.

Similarly, in the finishing molding step shown in FIG. 5, the finishing punch 82 as the upper die and the finishing die 83 as the lower die are arranged close to each other so as to be relatively movable in the proximity and separation directions. Then, the cutting material 50 set between the finishing punch 82 and the finishing die 83 is compressed and formed into a finished shape shown in FIG.
That is, the finishing punch 82 is provided so as to be movable up and down with respect to the finishing die 83, and the finishing punch 82 and the finishing die 83 are disposed in a state in which the respective compression surfaces 82a and 83a face each other. A molding space that forms a finished shape together with the finishing die 83 is formed by lowering 82, and a finished shape is formed by compressing the raw material 50 'molded into a rough ground shape set on the finishing die 83 in the molding space. To form.

And in this forging method, it is a peripheral part of the end surface (cutting surface 50a) of the cutting material 50 set between the wasteland punch 72 and the wasteland die 73 in the raw material shape | molded in a wasteland shape in a wasteland formation process, Then, a recess 50e is formed by recessing a portion corresponding to the finished groove 50d.
Specifically, a burr 50b of a material formed into a wasteland shape is provided on the compression surface 73a of the wasteland die 73 by providing a convex portion 73b formed in accordance with the peripheral edge shape of the cutting surface 50a of the cutting material 50. The concave portion 50e is formed in the rough ground shape.

  That is, before starting the rough ground forming shown in FIG. 4A, the cutting material 50 having the burr 50b obtained in the cutting step is set so that the cut surface 50a is in contact with the compression surface 73a of the rough ground die 73. Here, the position of the burr 50b portion of the cutting material 50 is set to be the position of the convex portion 73b.

Then, as shown in FIG. 4B, the wasteland punch 72 is in the descending end state, and the material is compressed into the formation space formed by the compression surface 72a of the wasteland punch 72 and the compression surface 73a of the wasteland die 73, and the wasteland. Molding is complete.
In this state, a recess 50e is formed in the raw material 50 'formed by roughing by the protrusion 73b, and a burr 50b remains as a burr mark 50c in the recess 50e.

Next, in the finish forming step, the recess 50e formed in the wasteland forming step is further recessed to form a groove portion 50d in the finished shape.
Specifically, by providing on the compression surface 83a of the finishing die 83 a surface area expanding convex portion 83b formed in accordance with the shape of the concave portion 50e formed in the rough ground forming step, the concave portion 50e formed on the raw material by the rough ground. This portion is further recessed to form a groove portion 50d in the finished shape.

  That is, before the finish molding start shown in FIG. 5A, the raw material 50 ′ having the rough ground shape obtained in the rough ground molding step is set on the compression surface 83 a of the finishing die 83. Here, the raw material 50 ′ having a rough ground shape is set so that the position of the burr mark 50c is the position of the surface area expanding convex portion 83b.

Then, as shown in FIG. 5B, the finishing punch 82 is in the lowered end state, and the material is compressed into the forming space formed by the compression surface 82a of the finishing punch 82 and the compression surface 83a of the finishing die 83, and finished. Molding is complete.
In the compression process of the material in the finish molding process, the concave portion 50e formed in the waste land molding process is further depressed by the surface area expanding convex part 83b provided in the finishing die 83, and the material of the burr mark 50c is compressed and deformed. While being pushed in, the surface area of the portion is expanded, and the portion of the burr mark 50c is assimilated and removed with the other portion of the material. That is, when the surface area expanding convex portion 83b is pushed into the material to be compressed and deformed, the surface area of the material is expanded and the burr mark 50c is removed as shown by the arrow in the material in FIG.

  As described above, in the forging method, a portion of the material that becomes the burr mark 50c in the rough ground forming process is recessed in advance, and the recessed portion is further locally recessed in the subsequent finishing forming process to form a finished shape. By doing so, the surface area expansion rate of the part of the burr mark 50c is ensured, and the burr mark 50c remaining in the waste land forming process is removed.

That is, by adopting this forging method, the burr 50b part of the cutting material 50 or the burr of the raw material 50 ′ after the rough ground forming is changed by changing the shape of the compression surface of the raw material in the rough ground forming step and the finish forming step. Since the surface area of the portion of the mark 50c can be enlarged, the burr mark remaining after forging can be easily removed and suppressed corresponding to the desired position.
That is, the position of the portion where the material is recessed in the wasteland forming process may be a position corresponding to the portion that becomes the groove portion in the finished shape on the compression surface of the material. For example, a convex portion is provided on the wasteland punch 72 side and the finish punch is provided. You may provide a surface area expansion convex part on the 82 side.

The longitudinal cross-sectional view which shows the structure of one Embodiment of the forging apparatus which concerns on this invention. The figure which shows the compression process of the forging apparatus which concerns on this invention. The longitudinal cross-sectional view which shows the shaping | molding shape in each process of a forge process. The longitudinal cross-sectional view which shows a wasteland shaping | molding process. The longitudinal cross-sectional view which shows a finish shaping | molding process. The schematic diagram which shows the cutting | disconnection structure in a cutting process. The longitudinal cross-sectional view which shows the shaping | molding shape in each process of the conventional forge process. The longitudinal cross-sectional view which shows the conventional forging apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forging device 2 Punch 2a Compression surface 3 Dies 3a Compression surface 11 Projection punch 12 Unloader 13a Upper hydraulic chamber 13b Lower hydraulic chamber 14a Upper hydraulic piping 14b Lower hydraulic piping 50 Cutting material 72 Wasteland punch 73 Wasteland die 73b Convex portion 82 Finish punch 83 Finishing dies 83b Surface area expansion convex part

Claims (5)

An upper mold and a lower mold that are disposed opposite to each other so as to be relatively close to and away from each other are provided, and by bringing them close to each other, a material set between the upper mold and the lower mold is used as the upper mold and the lower mold. A forging device that compresses into a molding space configured by
Surface area expanding means for temporarily expanding the surface area of the material to be compressed and deformed by temporarily projecting a part of the compression surface forming the molding space into the molding space in the process in which the upper mold and the lower mold are close to each other. A forging device comprising the forging device.   The surface area enlarging means includes a projecting punch provided such that a tip portion can project from the compression surface of the lower mold or the upper mold so as to be movable in the approaching / separating direction, and the projecting punch is moved with respect to the lower mold or the upper mold The forging device according to claim 1, further comprising a moving unit that moves the forging device.   The forging device according to claim 2, wherein a tip end portion of the protruding punch has a shape that follows a peripheral shape of an end surface on a protruding punch arrangement side of a material set between the upper die and the lower die. An upper mold and a lower mold that are disposed opposite to each other so as to be relatively close to and away from each other are provided, and by bringing them close to each other, a material set between the upper mold and the lower mold is used as the upper mold and the lower mold. A forging method in which the product is compressed into a predetermined shape and formed into a predetermined shape,
In the process in which the upper mold and the lower mold are close to each other, a part of the compression surface forming the molding space is temporarily protruded into the molding space, and the surface area of the material to be compressed and deformed is temporarily increased. Forging method to do. A rough ground forming step of compressing a material set between the upper mold and the lower mold into a rough ground shape by bringing the upper mold and the lower mold, which are opposed to each other so as to be relatively movable in the proximity and separation directions, close to each other; ,
By bringing the upper die and the lower die, which are opposed to each other so as to be relatively movable toward and away from each other, close to each other, the material formed in the rough shape set between the upper die and the lower die is formed into a finished shape. A forging method comprising a finish forming step,
In the wasteland forming step, a concave portion formed by recessing a portion corresponding to the groove portion of the finished shape, which is a peripheral portion of the end surface of the material set between the upper mold and the lower mold, in the material molded into the wasteland shape Form the
The forging method, wherein, in the finish forming step, the recess is further depressed to form the groove.

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