JP6626767B2 - Forging die and die regeneration method - Google Patents

Description

  The present invention relates to a forging die and a method of regenerating the die, and more particularly, to a forging die and a die that can be used for forging a hard-to-work metal material such as a titanium alloy or a nickel-based alloy. Reproduction method.

  In general, titanium alloys, nickel-based alloys, and the like have excellent mechanical properties and are therefore used as materials for engine members and structural members of transportation equipment such as aircraft and vehicles. A hot die forging method using a hot forging die apparatus is used as a method for manufacturing a forged product using a difficult-to-work material such as a titanium alloy. In the hot die forging method, a heated work material is charged into a concave portion of a mold that has been formed in a predetermined shape in advance, and the work material is formed into a shape along the mold while maintaining the work material in a high temperature state. This is a method of forging while deforming to stretch. With this hot forging method, a metal flow that conforms to the product shape can be obtained when the workpiece is deformed during forging, so it is more tenacious than other processing methods and has mechanical properties such as impact fracture resistance. It is possible to obtain an excellent forged product.

  In hot die forging of titanium alloys and nickel-based alloys, particularly hot die forging for engine components, holes and depressions are often formed by pressing a convex punched part into the center of the workpiece. Will be needed. In this case, the friction between the tip of the punch component and the workpiece is large, and the difficulty of machining a material such as a titanium alloy makes the tip of the punch component easy to wear. For this reason, there is a feature that the number of times of use of the punch part is limited as compared with the part of a general hot forging die apparatus.

  As described above, as a hot die forging method for forming a hole or a depression in a workpiece made of a material such as a titanium alloy, for example, Patent Document 1 discloses a lower mold having a concave portion into which a workpiece is inserted. There is disclosed a hot forging die apparatus including: a press die; and an upper die provided with a punch component projecting downward at the center of the pressing surface.

JP 2014-240082 A

  In the forging method disclosed in Patent Document 1, in the upper die provided with a punch component projecting downward at the center of the pressing surface, the tip of the punch component is easily worn, so that The dimensional accuracy decreases. For this reason, in order to secure the dimensional accuracy of the forged product, it is necessary to resync the tip of the punch component to correct the die shape, but in this case, there is a problem that the press stroke of the die changes after the resync. Occurs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a forging die and a method for regenerating the die, which can suppress a change in a press stroke of the die before and after resinking of a punch part. It is to be.

A forging die according to one aspect of the present invention includes a first die on which a workpiece is arranged, and a second die facing the first die with the workpiece interposed therebetween. . The second mold has a shape protruding toward the first mold, and has a punch part formed with a tip for pushing the workpiece into the workpiece, and a back part opposite to the tip. And a holding member for holding the punch component. The forging die includes a plate component disposed between the back surface of the punch component and the holding member. The holding member includes a holder component having an insertion hole into which the punch component is inserted. The punch component has a flange portion on the back surface side that is larger in diameter than the distal end portion. The forging die is provided with a locking portion for locking the flange portion inserted into the insertion hole. The outer diameter of the plate component is equal to or less than the outer diameter of the flange portion. The plate component is disposed in the insertion hole. The holding member includes a stopper for pressing an outer peripheral portion of the punch component or the plate component on a side opposite to the locking portion.

In the above-mentioned forging die, a forged product formed into a desired shape can be manufactured by pushing a workpiece into the tip of a punch part. Then, when the tip of the punch component is worn due to sliding with the workpiece, the tip is resynced to correct the mold shape, thereby ensuring the dimensional accuracy of the forged product. In addition, since the plate component is arranged between the punch component and the holding member, the height position of the tip of the punch component after resync can be fixed at the same position as before resync. Therefore, it is possible to suppress a change in the distance from the front end to the workpiece before and after the resync, and it is possible to suppress a change in the press stroke of the mold. Further, by locking the flange portion with the locking portion, the punch component can be stably held by the holder component. Further, according to the above configuration, the plate components can be easily arranged simply by fitting them into the insertion holes. Further, according to the above configuration, it is possible to prevent a punch component or a plate component from dropping out of the insertion hole even when the mold is turned upside down.

  In the forging die, a portion of the stopper that presses the outer peripheral portion of the plate component may be inclined along the shape of the outer peripheral portion of the plate component.

  According to this configuration, the side surface of the plate component can be held by the stopper. For this reason, a member for applying pressure to the punch component during forging can be arranged on the main surface of the plate component. In addition, the thickness of the plate component can be reduced, and the minimum length of one resync can be shortened. Therefore, the punch component can be used repeatedly over a longer period.

  The forging die may include a plurality of the plate components.

  According to this configuration, when resinking of the tip of the punch component is repeatedly performed, by increasing the number of plate components for each resync, it is possible to prevent a change in the press stroke of the mold after resync.

Mold reproducing method according to another aspect of the present invention is a method for reproducing the forging die, a step of resync the tip of the punch component used in the forging of the workpiece, the after the resync to process, and a, placing said plate part to the rear part of the side opposite to the tip of the punch components.

  In the above-described method of regenerating the die, the dimensional accuracy of the forged product can be ensured by resinking the tip of the punched part worn during forging of the workpiece and correcting the die shape. Moreover, by arranging the plate component on the back surface of the punch component after the resync, it is possible to fix the height position of the tip end of the punch component after the resync to the same position as before the resync. Therefore, it is possible to suppress a change in the distance from the front end to the workpiece before and after the resync, and it is possible to suppress a change in the press stroke of the mold.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a forging die and a method for regenerating the die, which can suppress a change in the press stroke of the die before and after the resync of the punch part.

It is a mimetic diagram showing the state before resync of the forging metallic mold concerning Embodiment 1 of the present invention. It is a schematic diagram which shows a mode that a to-be-processed material is forged by the said forging die. FIG. 3 is an enlarged view of a region III in FIG. 1. FIG. 4 is a top view of the forging die as viewed from an arrow IV in FIG. 3. It is a schematic diagram which shows the state before and after resync of a punch part. It is a schematic diagram which shows the state after the resync of the said forging die. FIG. 7 is a top view of the forging die viewed from an arrow VII in FIG. 6. FIG. 7 is an enlarged view of a region VIII in FIG. 6. It is a schematic diagram which shows the state after the resync of the said forging die. It is a schematic diagram which shows a mode that a to-be-processed material is forged by the said forging die. It is a schematic diagram which shows the forging die which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
[Forging die]
First, the structure of the forging die 1 according to Embodiment 1 of the present invention will be described. The forging die 1 is used for hot forging in which holes or depressions are formed by pressing a punch component 21 into a difficult-to-process workpiece 2 such as a titanium alloy or a nickel-based alloy. As shown in FIG. 1, a forging die 1 includes a lower die 10 (first die) on which a workpiece 2 is disposed, and a vertical direction with respect to the lower die 10 with the workpiece 2 interposed therebetween. And a facing upper mold 20 (second mold). The upper mold 20 and the lower mold 10 are configured to relatively move in a direction approaching or moving away from each other by a drive unit (not shown). In the present embodiment, the lower die 10 is fixed to the base 3 and the upper die 20 is lowered or raised. As a result, as shown in FIG. 2, the upper mold 20 is lowered toward the lower mold 10, and the tip 21A of the punch component 21 is pressed into the center of the workpiece 2 softened by heating, thereby forming the workpiece. Holes and depressions can be formed in the workpiece 2.

  As shown in FIG. 1, the lower die 10 has a horizontal mounting surface 11 </ b> A on which the workpiece 2 is mounted, a die mounting portion 11 which is a block fixed to the base 3, and a lower mounting surface 11 </ b> A. And a mold loading section 12 which is a block in which a loading section 12B, which is a space into which the workpiece 2 is loaded, is formed. The charging portion 12 </ b> B is formed deeper than the height of the workpiece 2. As shown in FIG. 2, when the workpiece 2 is formed by the punch component 21, the mold loading section 12 is formed by an inner surface 12 </ b> A so as to prevent the workpiece 2 from moving in the horizontal direction. Support. The mold installation part 11 and the mold loading part 12 may be formed separately from each other as in the present embodiment, and may be fixed to each other by a fastening member (not shown) such as a bolt, but is not limited thereto. , May be integrally formed as one member. Further, the lower mold 10 is not limited to the case where the lower mold 10 is constituted by the mold installation section 11 and the mold insertion section 12 as in the present embodiment, but is constituted only by the mold installation section 11 and the mold insertion section. 12 may be omitted.

  FIG. 3 is an enlarged view of the upper die 20 before the punch component 21 is resynced. The upper mold 20 has a shape protruding downward toward the lower mold 10, and has a punch part 21 formed with a tip 21 </ b> A for pushing the workpiece 2, and a back surface opposite to the tip 21 </ b> A. And a holding member 22 for holding the punch component 21 in the section. The holding member 22 includes a holder component 23 having an insertion hole 22A into which the punch component 21 is inserted, and a stopper 24 for preventing the punch component 21 from dropping out of the insertion hole 22A.

  The punch component 21 has a tapered shape whose diameter gradually decreases toward the distal end portion 21A, and the distal end portion 21A is located below the lower surface of the holder component 23 (workpiece side). Further, the punch component 21 has a flange portion 21B whose diameter is larger than that of the front end portion 21A on the back surface side opposite to the front end portion 21A.

  An insertion hole 22A penetrating in the thickness direction is formed in the holder component 23, and the punch component 21 is inserted into the insertion hole 22A from the upper surface side of the holder component 23. At this time, as shown in FIG. 3, the upper surface of the flange portion 21B, the upper surface of the stopper 24, and the upper surface of the holder component 23 are flush. Therefore, as shown in FIG. 1, the block-shaped mold base portion 28 can be brought into surface contact with the upper surface of the flange portion 21B. Accordingly, it is possible to apply a pressing force from the mold base portion 28 to the punch component 21 during forging. At this time, the mold base portion 28 receives a reaction force from the punch component 21.

  As shown in FIG. 3, a locking portion 22B for locking the flange portion 21B inserted into the insertion hole 22A is provided in the insertion hole 22A so as to project inward in the radial direction. Since the locking portion 22B is formed below the insertion hole 22A, the insertion hole 22A has a smaller hole diameter at the lower portion than at the upper portion (D2 <D1). For this reason, as shown in FIG. 3, when the tip 21A of the punch component 21 is inserted into the insertion hole 22A from the upper surface side of the holder component 23, the lower end of the flange portion 21B is locked by the upper surface of the locking portion 22B. Can be. That is, the lower end of the flange portion 21B can be hooked on the locking portion 22B. Thus, the punch component 21 can be held by the holder component 23 so as not to drop. The locking portion 22B may be provided on the entire circumferential direction of the insertion hole 22A, or may be provided only on a part of the circumferential direction within a range where the punch component 21 can be stably held.

  The stopper 24 is a component for pressing the punch component 21 so as not to fall off from above the insertion hole 22A. The stopper 24 is arranged on the opposite side of the locking portion 22B, and is fitted in a concave portion formed near the insertion hole 22A on the upper surface of the holder component 23. The stopper 24 is detachably attached to the holder component 23 by a fastening member 25 such as a bolt.

  The stopper 24 has a pressing portion that protrudes radially inward from the wall surface of the insertion hole 22A, and presses the outer peripheral surface of the punch component 21 downward (vertically) at the pressing portion. Further, as shown in FIG. 3, the pressing portion of the stopper 24 is inclined so as to reduce the diameter upward along the shape of the outer peripheral portion of the punch component 21. Thereby, the side surface of the punch component 21 can be pressed by the stopper 24. Therefore, it is possible to prevent the punch component 21 from falling off from above the insertion hole 22A while keeping the upper surface of the flange portion 21B flush with the upper surface of the stopper 24. That is, even when the upper mold 20 is turned upside down, the punch component 21 can be prevented from dropping out of the insertion hole 22A. Further, by removing the stopper 24, the punch component 21 can be easily pulled out from the upper side of the insertion hole 22A, and the punch component 21 that is easily worn can be easily replaced.

  FIG. 4 is a top view of the upper mold 20. As shown in FIG. 4, the stopper 24 is configured by a pair of components, and presses two portions of the punch component 21, a part in the circumferential direction and a part radially opposed to the part. Note that the stopper 24 is not limited to the case where the stopper 24 is configured by a pair of components as in the present embodiment, but may be configured by two or more pairs of components, or may be configured by a ring member along the outer periphery of the punch component 21. It may be configured so as to press the entire outer peripheral portion of the punch component 21. In this case, falling off of the punch component 21 from above the insertion hole 22A can be more effectively prevented.

  Here, resynchronization (mold correction) of the punch component 21 will be described. As described with reference to FIG. 2, in the hot forging using the forging die 1, the workpiece 2 is pushed in by the tip portion 21 </ b> A of the punch part 21, and at this time, the workpiece 2 slides with the workpiece 2. Wear of the tip portion 21A occurs. For this reason, if the forming of the workpiece 2 is performed continuously, the abrasion of the tip portion 21A progresses, so that the shape of the mold changes greatly, and as a result, the dimensional accuracy of holes and dents formed in the forged product deteriorates. .

  Therefore, in order to secure the dimensional accuracy of the forged product by adjusting the shape of the tip 21A, it is necessary to modify the shape by cutting the tip 21A. This is called resync. Specifically, the punch part 21 is cut so as to have a shape shown by a solid line from an initial shape shown by a broken line in FIG.

  At this time, as shown in FIG. 5, the whole of the punch component 21 is shortened by the length L1 (the amount of resync) by shaving the end portion 21A. Here, the lower end of the flange portion 21B locked by the locking portion 22B (FIG. 3) is also cut by the same resync amount L1 so that the height position of the distal end portion 21A is the same as before the resync. Then, as shown in FIG. 6, the punch component 21 after the resync is attached to the holder component 23. At this time, the upper surface 21BB of the flange portion 21B moves downward by the length L1 from before the resync. As a result, a step is generated between the upper surface 21BB of the flange portion 21B and the upper surface of the holder component 23, and a gap is generated between the punch component 21 and the mold base portion 28 (FIG. 1).

  The main feature of the forging die 1 according to the present embodiment is that the forging die 1 includes a plate component 26 for filling a gap generated between the punch component 21 and the die base 28 after resync. As shown in FIG. 6, the plate component 26 is arranged between the back surface of the punch component 21 (the upper surface 21BB of the flange portion 21B) and the stopper 24, and has the same thickness as the resync amount L1 of the distal end portion 21A. . By arranging the plate component 26, it is possible to fix the height position of the tip end portion 21A of the punch component 21 after resync to the same position as before resync. Thereby, it is possible to suppress a change in the distance from the front end portion 21A to the workpiece 2 before and after the resync (the reference sign “L” in FIG. 1 and the reference sign “L ′” in FIG. 9). Of the press stroke (the distance at which the upper mold 20 descends toward the lower mold 10 during forging) can be suppressed.

  FIG. 7 is a top view of the upper mold 20 after resync. As shown in FIG. 7, the plate component 26 is a plate-like member having a circular shape in plan view, and has an outer diameter equal to or less than the outer diameter of the flange portion 21B (in the present embodiment, the same as the outer diameter of the flange portion 21B). ). For this reason, as shown in FIG. 6, the plate component 26 is disposed on the upper surface 21BB of the flange portion 21B in the insertion hole 22A. The plate component 26 is made of the same material as the punch component 21 and the holder component 23, and specifically, is made of a material having heat resistance and durability such as alloy tool steel such as JIS standard SKD61 or SKT4 or chromium molybdenum steel.

  The plate component 26 has the same thickness as one resync amount L1 of the tip 21A of the punch component 21 shown in FIG. FIG. 6 shows a state in which the resync is performed three times and the plate components 26 are arranged one by one after each resync, and the resink amount L1 of the leading end 21A and the thickness of the plate components 26 in each resync are the same. It is. That is, the forging die 1 may include a plurality of plate components 26. In this case, the total thickness of the plurality of plate components 26 is equal to the total resync amount. Also, in FIG. 6, the plate components 26 are all shown with the same thickness, but when the resync amounts are different from each other, the thickness of the plate components 26 changes accordingly. Therefore, the forging die 1 may include a plurality of plate components 26 having the same thickness, or may include a plurality of plate components 26 having different thicknesses.

  The stopper 24 functions as a component that prevents the punch component 21 from dropping from above the insertion hole 22A before resync, but a component that presses the plate component 26 and the punch component 21 from dropping from above the insertion hole 22A after resync. Function as As shown in FIG. 8, the stopper 24 presses the outer peripheral surface of the plate component 26 downward at the pressing portion 24A that protrudes radially inward from the wall surface of the insertion hole 22A. The pressing portion 24 </ b> A of the stopper 24 is provided with an inclined surface whose diameter decreases upward along the shape of the outer peripheral portion of the plate component 26, and the side surface of the plate component 26 can be pressed by the inclined surface. As a result, as shown in FIG. 8, the main surface of the uppermost plate part 26 and the upper surface of the stopper 24 can be flush, and the mold base 28 (FIG. 1) is Surface contact can be made. Therefore, even after the resync, the pressing force at the time of forging can be applied to the punch component 21 from the mold base portion 28 via the plate component 26.

[Regeneration method of mold]
Next, a method of regenerating a mold according to the present embodiment will be described. First, forging of the workpiece 2 using the forging die 1 that is performed before the die regeneration method according to the present embodiment will be described.

  First, a step of preparing the workpiece 2 is performed. In this step, as shown in FIG. 1, a workpiece 2 having, for example, a rectangular column shape or a rectangular column shape in cross section is prepared. The workpiece 2 is made of a hard-to-work metal material such as a titanium alloy or a nickel-based alloy. As titanium alloys, Ti-10V-2Fe-3Al, Ti-6Al-4V, Ti-6Al-2Sn-4Zr-6Mo, Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-5Al-5V-5Mo-3Cr , Ti-6Al-2Sn-4Zr-2Mo and the like.

  Next, a step of heating the workpiece 2 is performed. In this step, the workpiece 2 is placed in a heating furnace (not shown) and heated to a forging temperature of about 700 to 1000 ° C. as a whole. During the heating process of the workpiece 2 in this manner, the upper mold 20 and the lower mold 10 are heated to a temperature of about 600 to 1000 ° C. by a built-in heater (not shown) as necessary. In the present embodiment, the hot forging of the workpiece 2 is performed, so this step is essential. However, in the case of cold forging, this step can be omitted.

  Next, a step of arranging the workpiece 2 between the molds is performed. In this step, the workpiece 2 softened by heating in the above step is loaded into the loading section 12B of the lower mold 10 as shown in FIG. As a result, the workpiece 2 is disposed between the lower mold 10 and the upper mold 20.

  Next, a step of hot forging the workpiece 2 is performed. In this step, the upper mold 20 is lowered by the drive unit (not shown) so as to approach the lower mold 10. Thereby, the tip portion 21A of the punch component 21 comes into contact with the upper surface of the workpiece 2. By further lowering the upper mold 20 in this state, the central portion of the workpiece 2 held in a high temperature state is pushed by the tip 21A of the punch component 21. Thereby, as shown in FIG. 2, a depression along the shape of the punch component 21 is formed in the workpiece 2, and a forged product is manufactured. Thereafter, the upper die 20 is raised by the drive unit, and the manufactured forged product is taken out of the lower die 10.

  Hereinafter, a method of regenerating a mold according to the present embodiment will be described. First, a step of resyncing the punch component 21 is performed. In this step, the tip 21A of the punch component 21 used for forging the workpiece 2 is resynced in the following procedure.

  First, the mold base portion 28 (FIG. 1) is removed, and then the fastening member 25 is loosened to remove the stopper 24 from the holder component 23 (FIG. 3). Next, the punch component 21 is pulled out from above the insertion hole 22A, and the punch component 21 is removed from the holder component 23. Next, as shown in FIG. 5, the tip 21A of the punch component 21 is resynced by the length L1, and the lower end of the flange 21B is also resynced by the same length L1. As a method of resinking the punch component 21, ordinary metal cutting can be used, but is not particularly limited.

  Next, a step of arranging the plate component 26 is performed. In this step, as shown in FIG. 6, first, the punch component 21 after resync is inserted from above the insertion hole 22A. Next, the plate component 26 having the same thickness as the resink amount L1 of the distal end portion 21A is inserted into the insertion hole 22A, and is arranged on the back surface of the punch component 21 (the upper surface 21BB of the flange portion 21B). Thereafter, the stopper 24 is attached to the holder component 23 by the fastening member 25, and the punch component 21 and the plate component 26 are fixed so as not to fall off from above the insertion hole 22A. At this time, as shown in FIG. 6, the main surface of the uppermost plate component 26, the upper surface of the stopper 24, and the upper surface of the holder component 23 are flush with each other. Finally, the mold base 28 is fixed so as to make surface contact with the main surface of the plate component 26. As described above, FIG. 6 shows a state in which resync is performed three times and three plate components 26 are arranged corresponding to the resync. However, in actuality, the resync is performed for each resync. A plate part 26 having the same thickness as the quantity is placed.

  By arranging the plate component 26 on the back surface of the punch component 21 opposite to the distal end portion 21A, the distance L '(FIG. 9) between the distal end portion 21A and the workpiece 2 after resync is reduced. It is possible to suppress a change in the distance L (FIG. 1) between the front end portion 21A and the workpiece 2 in front. Therefore, the next forging can be started while suppressing the change of the press stroke of the upper die 20 (FIG. 10).

[Effects]
Next, the features of the forging die 1 and the method of regenerating the die according to the present embodiment and the effects thereof will be described.

  The forging die 1 according to the present embodiment includes a lower die 10 on which the workpiece 2 is arranged, and an upper die 20 opposed to the lower die 10 with the workpiece 2 interposed therebetween. The upper mold 20 has a shape protruding toward the lower mold 10, and has a punch part 21 formed with a tip part 21 </ b> A for pushing into the workpiece 2, and a back part opposite to the tip part 21 </ b> A. And a holding member 22 for holding the punch component 21. The forging die 1 includes a plate component 26 disposed between the back surface of the punch component 21 and the holding member 22.

  The method for regenerating a mold according to the present embodiment includes a step of resyncing the tip 21A of the punch component 21 used for forging the workpiece 2 and a step of resinking the tip 21A of the punch component 21 after the resync process. Arranging the plate component 26 on the opposite back surface.

  According to the above-described feature, by forging the workpiece 2 with the tip portion 21A of the punch component 21, a forged product formed into a desired shape can be manufactured. When the tip 21A of the punch component 21 is worn due to sliding with the workpiece 2, the tip 21A is resynced to correct the shape of the die, thereby ensuring the dimensional accuracy of the forged product. Can be. Moreover, since the plate component 26 is disposed between the punch component 21 and the holding member 22, the height position of the tip 21A of the punch component 21 after resync can be fixed at the same position as before resync. Become. Therefore, it is possible to suppress a change in the distance from the tip portion 21A to the workpiece 2 before and after the resync, and it is possible to suppress a change in the press stroke of the mold.

  In the forging die 1 described above, the holding member 22 includes a holder component 23 having an insertion hole 22A into which the punch component 21 is inserted. The punch component 21 has a flange portion 21B whose diameter is larger than the distal end portion 21A on the back surface side. The forging die 1 is provided with a locking portion 22B for locking the flange portion 21B inserted into the insertion hole 22A. According to this configuration, by locking the flange portion 21B with the locking portion 22B, the punch component 21 can be stably held by the holder component 23.

  In the forging die 1, the outer diameter of the plate component 26 is equal to or less than the outer diameter of the flange portion 21B. The plate component 26 is disposed in the insertion hole 22A. Thereby, the plate component 26 can be easily arranged simply by fitting it into the insertion hole 22A.

  In the forging die 1, the holding member 22 includes a stopper 24 that presses the outer peripheral portion of the punch component 21 or the plate component 26 on the side opposite to the locking portion 22B. According to this configuration, it is possible to prevent the punch component 21 and the plate component 26 from dropping out of the insertion hole 22A even when the mold is turned upside down.

  In the forging die 1, a portion 24A of the stopper 24 that presses the outer peripheral portion of the plate component 26 is inclined along the shape of the outer peripheral portion of the plate component 26. According to this configuration, the side surface of the plate component 26 can be held by the stopper 24. For this reason, the die base portion 28 for applying pressure to the punch component 21 at the time of forging can be arranged so as to be in surface contact with the main surface of the plate component 26. In addition, the thickness of the plate component 26 can be reduced, and the minimum length of one resync can be reduced. For this reason, the punch component 21 can be used repeatedly over a longer period.

  The forging die 1 includes a plurality of plate components 26. Thus, when the resynchronization of the tip 21A of the punch component 21 is repeatedly performed, by increasing the number of the plate components 26 for each resync, it is possible to prevent the press stroke of the mold from changing after the resync.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. The second embodiment is basically the same as the first embodiment, but in the first embodiment, not only the front end portion 21A but also the lower end of the flange portion 21B are cut in the resinking of the punch component 21 (FIG. 5). The second embodiment is different from the second embodiment in that the lower end of the flange portion 21B is not cut. Hereinafter, only differences from the first embodiment will be described.

  FIG. 11 shows a state before resync of the punch component 21 in the second embodiment. As shown in FIG. 11, in the second embodiment, a plurality of (three in this embodiment) ring members 27 having a rectangular cross section are arranged in advance between the lower end of the flange portion 21B and the upper surface of the locking portion 22B. I have. The thickness T1 of the ring member 27 is the same as the single resync amount L1 at the tip 21A of the punch component 21, and is the same as the thickness of one plate component 26 (FIG. 6).

  For this reason, it is not necessary to cut the lower end of the flange portion 21B at the time of resinking by removing the ring members 27 one by one for each resink of the distal end portion 21A, as in the first embodiment. The position can be adjusted to the same position before and after resync. By arranging the plate component 26 on the upper surface 21BB of the flange portion 21B as in the first embodiment, it is possible to suppress a change in the press stroke of the upper mold 20 before and after resync.

(Other embodiments)
Finally, other embodiments of the present invention will be described.

  In the first embodiment, only the case where the hot forging of the workpiece 2 is performed has been described. However, the present invention is not limited to this, and warm forging or cold forging may be performed.

  In the first embodiment, only the case where the holes and the dents are formed in the workpiece 2 has been described. However, the present invention is not limited to this, and forging for compressing in the height direction without forming the holes and the dents may be performed. .

  In the first embodiment, the case where the workpiece 2 is made of a difficult-to-work material such as a titanium alloy or a nickel-based alloy has been described. However, the present invention is not limited to this, and may be made of various other metal materials. .

  In the first embodiment, the case where the punch component 21 is inserted into the insertion hole 22A and the flange portion 21B is locked by the locking portion 22B has been described, but the present invention is not limited to this. For example, a configuration in which the flange part 21B, the insertion hole 22A, and the locking part 22B are not provided, and the punch component 21 is fixed to the holder component 23 by a fastening member such as a bolt may be used.

  In the first embodiment, the case where the upper mold 20 descends toward the lower mold 10 has been described. However, the present invention is not limited to this, and the lower mold 10 may move toward the upper mold 20, Both the upper mold 20 and the lower mold 10 may move.

  In the first embodiment, the stopper 24 may be omitted, and the punch component 21 and the plate component 26 may be prevented from falling off from above the insertion hole 22A by other means. Further, the pressing portion 24A of the stopper 24 is not limited to the case where it is inclined along the shape of the outer peripheral portion of the plate component 26, and may be parallel in the vertical direction.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Forging die 2 Workpiece 10 Lower die (1st die)
20 Upper mold (second mold)
DESCRIPTION OF SYMBOLS 21 Punch part 21A Tip part 21B Flange part 22 Holding member 22A Insertion hole 22B Locking part 23 Holder part 24 Stopper 26 Plate part L1 Resync amount

Claims (4)

A first mold on which a workpiece is arranged;
A second mold facing the first mold with the workpiece interposed therebetween,
The second mold is
A punch component having a shape protruding toward the first mold and having a tip portion for pushing the workpiece into the workpiece;
A holding member for holding the punched component at a back surface portion opposite to the front end portion,
A plate component disposed between the back surface of the punch component and the holding member ,
The holding member includes a holder component having an insertion hole into which the punch component is inserted,
The punch component has a flange portion whose diameter is larger than the front end portion on the back surface side,
A locking portion for locking the flange portion inserted into the insertion hole is provided,
The outer diameter of the plate component is equal to or less than the outer diameter of the flange portion,
The plate component is disposed in the insertion hole,
The forging die, wherein the holding member includes a stopper for pressing an outer peripheral portion of the punch component or the plate component on a side opposite to the locking portion . Portion for holding the outer peripheral portion of the plate part in the stopper is inclined along the shape of the outer peripheral portion of the plate parts, forging die according to claim 1. Characterized in that it comprises a plurality said plate parts, forging die according to claim 1 or 2. A method for regenerating a forging die according to claim 1,
A step of resync the tip of the punch part that is used the forging of the workpiece,
Wherein after the resync to step, said placing said plate part to the rear part of the side opposite to the tip of the punch parts, including a mold reproducing method.

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