WO2007015497A1

WO2007015497A1 - Swaging method and swaging apparatus

Info

Publication number: WO2007015497A1
Application number: PCT/JP2006/315262
Authority: WO
Inventors: Atsushi Otaki
Original assignee: Showa Denko K.K.
Priority date: 2005-08-03
Filing date: 2006-08-02
Publication date: 2007-02-08
Also published as: EP1914029A1; EP1914029A4; CN101237949A; CN101237949B

Abstract

This invention provides a swaging method that can provide swaged products with high productivity. An extruder (11) and a two-split closed die (20) are provided. Split pieces (21, 21) of the closed die are mutually combined so that, in such a state that an extrusion material (1) is extruded through an extrusion port (15) in an extrusion nozzle (13) in the extruder (11), the front end part of the extrusion nozzle (13) is disposed within a cavity (25) of the closed die (20), whereby the closed die (20) is formed and, at the same time, holding parts (22, 22) provided respectively on both the split pieces (21, 21) cooperatively hold the extrusion material (1) therebetween. Next, while extruding the extrusion material (1) through the extrusion port (15) of the extrusion nozzle (13) by the extruder (11), in such a state that the extrusion material (1) is held by the holding parts (22, 22) of both the split pieces (21, 21), both the split pieces (21, 21) are moved forward of the extrusion direction of the extrusion material (1) at a lower speed than the extrusion speed, whereby the extrusion material (1) in its exposed part (2) exposed between the extrusion nozzle (13) in its extrusion port (15) and the holding part (22) in both the split pieces (21, 21) undergoes diameter expansion within a cavity (25).

Description

Specification

Upsetting method and upsetting apparatus

Technical field

TECHNICAL FIELD [0001] The present invention relates to an upsetting method and an upsetting apparatus used for manufacturing a product having an enlarged diameter portion such as an arm for a vehicle (such as an automobile or a railway vehicle), a connecting rod, and a piston.

Background art

[0002] Generally, the upsetting process is to increase the diameter of the planned diameter expansion portion of the material by pressurizing the diameter expansion planned portion of the rod-shaped material in the axial direction. In this upsetting case, if the material buckles during diameter expansion, the resulting product (that is, the upset product) will have a shape defect (such as a crease and no blurring), and the value of the product will be impaired. Therefore, in order to prevent buckling, the following upsetting method has been conventionally known.

[0003] That is, the material is fixed to the fixed die, and the diameter-expanded portion of the material is passed through a through hole provided in the guide to keep the diameter-expanded portion in a buckling-prevented state. Then. While pressing the planned diameter expansion part of the material with the punch in the axial direction, the guide is moved in a direction opposite to the direction of movement of the punch, thereby expanding the material exposed between the tip of the guide and the fixed die. This is a method of expanding the diameter-scheduled portion (see, for example, Patent Document 14).

[0004] In this upsetting method, when the diameter expansion part of the material is expanded in the cavity (molding recess) of the closing die, this upsetting method falls within the category of restrained upsetting method. enter. According to this constrained upsetting method, a preform with a shape as close as possible to the desired product shape can be manufactured, and as a result, the material yield and the number of manufacturing processes can be reduced. There is a point.

Patent Document 1: Japanese Patent Laid-Open No. 9-253782

Patent Document 2: Japanese Patent Publication No. 7-506768

Patent Document 3: Japanese Patent Laid-Open No. 2005-59097

Patent Document 4: Japanese Patent Laid-Open No. 2005-144554

Disclosure of the invention Problems to be solved by the invention

[0005] Therefore, in the upset casing, a material such as an extruded material is used as a material.

When using this material to produce an upset product by the above-described conventional restraint upsetting method, the material is first produced by extrusion using an extrusion device, and then the resulting material is constrained upsetting device. And set in the apparatus. The set material was upset. In other words, the process of extruding the raw material and the process of upsetting the raw material were performed separately, and the productivity of the upsetting product was low.

[0006] The present invention has been made in view of the above technical background, and the object thereof is an upsetting method with high productivity of an upsetting product, an upsetting product obtained by the method, and the above It is to provide an upsetting apparatus used in the method.

[0007] Other objects and advantages of the present invention will be apparent from the following preferred embodiments.

Means for solving the problem

[0008] The present invention provides the following means.

[1] Using an extrusion apparatus having an extrusion nozzle provided with an extrusion port at the tip, and a closing die having a cavity and divided into a plurality of parts,

The extrusion die of the extrusion nozzle of the extrusion apparatus is combined with a plurality of closed die divided pieces so that the tip of the extrusion nozzle is placed in the cavity in a state where the extruded material is extruded, thereby forming a closed die. Forming and extruding the extruded material in cooperation with each other at the holding portions respectively provided in the plurality of divided pieces;

By extruding the extrusion locus of the extrusion nozzle by the extrusion device, the material of the exposed portion of the extruded material exposed between the extrusion port of the extrusion nozzle and the sandwiching portions of the plurality of divided pieces is filled in the cavity. However, in a state where the extruded material is sandwiched by the sandwiching portions of the plurality of divided pieces, the plurality of divided pieces are moved forward in the extrusion direction of the extruded material at a lower speed than the extrusion speed and relatively to the extrusion port of the extrusion nozzle. A step of expanding the exposed portion of the extruded material in the cavity by moving,

The upsetting method characterized by including.

[0010] [2] In the clamping step, the length of the exposed portion of the extruded material is less than the buckling limit length of the exposed portion. 2. The upsetting method according to item 1, wherein the extruded material is clamped by the clamping portions of the plurality of divided pieces at a lower position.

[3] In the diameter expansion step, a time lag is set between the start of movement of the plurality of divided pieces and the force at the time of starting the holding of the plurality of divided pieces to the extruded material in the holding step. The upsetting method described in 1 or 2 above.

[4] During the time lag, in a state where the extruded material is sandwiched by the sandwiching portions of the plurality of divided pieces, the sandwiched portion of the extruded material or a portion on the front side in the extrusion direction with respect to the sandwiched portion. The upsetting method as described in item 3 above.

[5] The upsetting method according to any one of [1] to [4], wherein an anti-slip means is applied to a sandwiching portion of at least one divided piece among the plurality of divided pieces.

[6] The upsetting method as recited in the aforementioned Item 5, wherein a sandwiching protrusion for the extruded material is provided as the anti-slip means in the sandwiching portion of the at least one divided piece.

[7] After the diameter expansion step, a step of releasing the sandwiched portions of the plurality of split pieces from the extruded material;

After the clamping release step, returning the plurality of divided pieces to an initial position; and

The upsetting method according to any one of the preceding items 1 to 6, wherein the clamping step, the diameter expansion step, the clamping release step, and the return step are sequentially repeated.

[0016] [8] An upset product obtained by the upsetting method according to any one of 1 to 7 above.

[9] An extrusion apparatus having an extrusion nozzle provided with an extrusion port at a tip end thereof, and an extrusion port force of the extrusion nozzle.

A closing die having a cavity and divided into a plurality of parts;

A split piece combining device for combining a plurality of closed die divided pieces with each other so that the closed die is formed;

In a state where the plurality of divided pieces are combined with each other, the plurality of divided pieces are moved relative to the extrusion port of the extrusion nozzle at a lower speed than the extrusion speed in the extrusion direction of the extruded material by the extrusion device. A driving device; With

The plurality of divided pieces are each provided with a clamping portion,

By combining the plurality of divided pieces with each other by the divided piece combining device, the holding portions of the plurality of divided pieces are configured to hold the extruded materials in cooperation with each other. Upsetting machine to do.

[0018] [10] The preceding paragraph 9 further comprising a cutting device for cutting a sandwiched portion of the extruded material sandwiched by the sandwiching portions of the plurality of divided pieces or a portion on the front side in the extrusion direction from the sandwiched portion. Up-setting machine.

[11] The upsetting apparatus as recited in the aforementioned Item 9 or 10, wherein a non-slip means is applied to a sandwiching portion of at least one of the plurality of divided pieces.

[0020] [12] The upsetting apparatus as recited in the aforementioned Item 11, wherein the sandwiching portion of the at least one divided piece is provided with an erosion protrusion to the extruded material as the anti-slip means.

[13] The divided piece combining device is further configured to separate the plurality of divided pieces combined with each other.

The drive device according to any one of the preceding items 9 to 12, wherein the drive device further returns the plurality of divided pieces moved relative to the extrusion port of the extrusion nozzle to the initial position in the extrusion direction of the extruded material. The upsetting carriage device according to any one of the preceding claims.

The invention's effect

[0022] The present invention has the following effects.

[0023] In the invention of [1], the process of extrusion-producing the extruded material and the process of upsetting the extruded material can be performed continuously. As a result, productivity of upsetting products can be improved.

[0024] Furthermore, since the pushing force of the extrusion device is used as a force for pressing the extruded material in the axial direction in order to expand the exposed portion of the extruded material (that is, the diameter expansion planned portion), Used in the Caloe method! /, And does not require a punch for pressing the material in the axial direction and its drive. Therefore, simplification of the upsetting apparatus can be achieved.

[0025] Of course, the exposed portion of the extruded material is expanded in the cavity of the closing die, so that a preform having a shape as close as possible to the desired product shape can be manufactured. It is possible to improve the material yield and reduce the number of manufacturing processes.

[0026] Furthermore, while the material of the exposed portion of the extruded material is filled in the cavity, the extruded material is pushed forward in the extrusion direction of the extruded material while the extruded material is sandwiched by the sandwiched portion of the plurality of divided pieces. By moving at a lower speed, the material flow in the cavity is dispersed. Therefore, it is possible to fill the corners in the cavity of the closing die without increasing the pushing force of the extrusion device excessively. As a result, it is possible to prevent a problem that an unfilled portion is generated in the cavity, and thus it is possible to obtain a high-quality upsetting product having no lack of defects.

[0027] Furthermore, since the material can be filled in the corners in the cavity of the closing die without excessively increasing the pushing force of the extrusion device, the load applied to the closing die during processing can be reduced. . Therefore, the service life of the closing die can be extended.

[0028] In the invention [2], buckling of the extruded material can be surely prevented, and the exposed portion of the extruded material can be expanded in diameter.

In the invention of [3], the cross-sectional area of the exposed portion of the extruded material can be increased at the initial stage of diameter expansion. For this reason, the buckling limit length of the exposed portion of the extruded material can be increased, and buckling can be prevented more reliably.

[0030] In the invention of [4], when cutting the sandwiched portion of the extruded material or the portion ahead of the sandwiched portion in the extrusion direction as the scheduled cutting portion, the portion of the extruded material is not moved. The portion of the extruded material can be easily cut.

[0031] Furthermore, since the extruded material can be cut while extruding the extruded material with the extrusion device, it is possible to save the space for installing the upsetting apparatus.

[0032] In the invention [5], the extruded material can be held firmly.

[0033] In the invention of [6], the extruded material can be securely clamped.

[0034] In the invention of [7], the productivity of the upsetting product can be further improved.

[0035] According to the invention [8], it is possible to provide a high-quality upsetting product that does not have a shape defect such as a lacking defect, a crease, or a fogging defect.

[0036] According to the inventions [9] to [13], an upsetting apparatus suitably used in the upsetting method according to the present invention can be provided. Brief Description of Drawings

[0037] FIG. 1A is a partially cutaway plan view of an upsetting apparatus according to an embodiment of the present invention.

FIG. 1B is a partially cutaway plan view showing a state in which a pair of left and right closed die split pieces of the upsetting apparatus are combined with each other.

[FIG. 1C] FIG. 1C is a partially cutaway plan view showing a state in which the exposed portion of the extruded material is being expanded in diameter between time lags by the upsetting apparatus.

[FIG. 1D] FIG. 1D is a partially cut-out plan view showing a state in which the exposed portion of the extruded material has been expanded in diameter by the upsetting apparatus.

[FIG. 1E] FIG. 1E is a partially cutaway plan view showing a state in which both divided pieces of the upsetting apparatus are separated from each other.

[FIG. 1F] FIG. 1F is a partially cutaway plan view showing a state in which both split pieces of the upsetting apparatus are returned to their initial positions.

[FIG. 1G] FIG. 1G is a partially cutaway plan view showing a state in which both divided pieces of the upsetting apparatus are combined with each other again.

FIG. 2A is a cross-sectional view taken along line AA in FIG. 1A.

[FIG. 2B] FIG. 2B is a front view as seen from the line BB in FIG. 1A.

[FIG. 2C] FIG. 2C is a side view as seen from line CC in FIG. 1A.

[Fig. 3] Fig. 3 is a perspective view of an upholstery product processed by the upholstery device.

[0038] 1 ... Extruded material

2 ... exposed area

3… Clamped part

5 ... Upsetting power

6 ... Diameter expansion part

7 ... bite

10 ··· Upsetting machine 11 ... Extruder

13 ... Extrusion nozzle

15 ... Extrusion port

200: Split piece combination device

20 ··· Blocking die

21 ... divided pieces

22 ... clamping part

23 ... biting protrusion

25..Cabinetity

29 ... Fluid pressure cylinder

30 ... Drive device

31 ... Fluid pressure cylinder

40 ... Cutting device

41 ... Cutting blade

42 ... Cutting die

43 ... Fluid pressure cylinder

BEST MODE FOR CARRYING OUT THE INVENTION

[0039] Next, some preferred embodiments of the present invention will be described below with reference to the drawings. In this embodiment, for convenience of explanation, the front means the front in the extrusion direction of the extruded material, and the rear means the direction opposite to the extrusion direction of the extruded material.

FIG. 1A to FIG. 3 are diagrams for explaining an embodiment of the present invention.

[0041] In FIG. 1A, (10) is an upsetting cache device according to this embodiment. This upsetting apparatus (10) is a restraining upsetting apparatus in detail. (1) is an extrusion material.

[0042] In Fig. 3, (5) is an upset case product processed by the upset carriage device (10). This upsetting product (5) has one enlarged-diameter part (6) formed on a part of its axial direction (more specifically, the end part). This upsetting product (5) is used as a preform for manufacturing products such as arms, connecting rods, and pistons for vehicles (automobiles, railway vehicles, etc.). The Specific examples of the vehicle arm include a linear arm having a connecting portion (for example, a bush mounting portion) connected to another member, a knuckle, and the like.

[0043] As shown in FIGS. 1A and 2A to 2C, the extruded material (1) is also a solid bar-shaped aluminum or aluminum alloy extruded material. The cross-sectional shape of the extruded material (1) is circular, and the diameter of the extruded material (1) is set constant in the axial direction (that is, the extrusion direction).

[0044] In the present invention, the material of the extruded material (1) is not limited to aluminum or an aluminum alloy, but may be a metal such as brass, copper, stainless steel, or plastic. May be. Further, the cross-sectional shape of the extruded material (1) is not limited to a circular shape, but may be a polygonal shape such as a rectangular shape or a hexagonal shape. The extruded material (1) is not limited to a solid material, and may be, for example, a hollow material.

[0045] The diameter of the extruded material (1) is, for example, 16 mm. In the upsetting product (5), for example, the maximum diameter of the enlarged diameter part (6) is 60 mm, and the length of the enlarged diameter part (6) is 45 mm. However, in the present invention, the diameter of the extruded material (1) and the dimensions of each part of the upsetting product (5) are not limited to the above dimensions. For example, the diameter of the extruded material (1) and the dimensions of each part of the upsetting product (5) should be set so that the object of the present invention can be achieved in accordance with the manufacture of products such as vehicle arms, connecting rods, and pistons. Can do.

As shown in FIG. 1A, the upsetting apparatus (10) includes an extrusion apparatus (11), a closing die (20), and a cutting apparatus (40).

[0047] The extrusion device (11) is for producing the extruded material (1) by extrusion. This extrusion apparatus (11) has a container part (12), an extrusion nozzle (13), and a stem (16). A billet (B) made of aluminum or aluminum alloy is loaded into the container portion (12). The stem (16) is used to press the billet (B) in the container part (12) forward from the rear side in the extrusion direction. The extrusion nozzle (13) is provided in the container part (12) so as to protrude forward in the extrusion direction. Inside the extrusion nozzle (13), a forming hole (14) force communicating with the inside of the container portion (12) is provided so as to extend in the axial direction (that is, the length direction) of the extrusion nozzle (13). The outer diameter of the extrusion nozzle (13) is set constant in the axial direction. An extrusion port (15) as an outlet of the forming hole (14) is provided at the tip of the extrusion nozzle (13). The cross-sectional shape of the extrusion port (15) (that is, the forming hole (14)) corresponds to the cross-sectional shape of the extruded material (1). That is, it is formed in a circular shape.

[0048] The closing die (20) has a closing cavity (25) for forming a predetermined portion of the extruded material (1) into a designed shape. Further, the closing die (20) is divided into two along its axial direction (that is, the extrusion direction of the extruded material (1)). From the pair of left and right closing die divided pieces (21) (21) It is configured. Both the split pieces (21) and (21) are arranged opposite to each other on the left and right sides of the extrusion nozzle (13) of the extrusion device (11). Both divided pieces (21) and (21) have the same configuration.

[0049] The split portion of the front wall portion of each split piece (21) has a sandwiching portion (22) composed of a concave groove (concave portion) having a semicircular cross section (semicircular arc shape) that sandwiches the extruded material (1). Is provided. Then, as shown in FIG. 1B, the two split pieces (21) and (21) are combined with each other so as to form the closing die (20), whereby the sandwiching portion of the split pieces (21) and (21) is obtained. (22) In (22), the extruded materials (1) are clamped in cooperation with each other. Further, in this state, the extruded material (1) is sandwiched between the two divided pieces (21) and (21) in the state where the extruded material (1) is held by the holding portions (22) and (22) of both divided pieces (21) and (21). It is fitted inside the holding part (22) (22). The sandwiching portions (22) and (22) of the two split pieces (21) and (21) are provided with protrusions (23) for biting into the extruded material (1) as anti-slip means for the extruded material (1), respectively. ing. Therefore, the diameter of the clamping part (22) is set slightly smaller than the diameter of the extruded material (1). Therefore, when the extruded material (1) is clamped between the clamping parts (22) and (22) of both split pieces (21) and (21), the biting protrusions (23) of the clamping parts (22) of each split piece (21) are It will bite into the sandwiched portion (3) of the extruded material (1), thereby preventing the extruded material (1) from slipping in the axial direction.

[0050] In the present embodiment, the biting protrusions (23) are provided in the sandwiching portions (22) (22) of both of the split pieces (21) (21). The biting protrusion (23) may be provided only in the holding part (22) of any one of the divided pieces (21) and (21). Further, as a means for preventing the extruded material (1) from slipping in the axial direction, that is, as a means for preventing slipping, a means different from the biting protrusion (23) is applied to the clamping part (22). Also good.

[0051] Further, in the divided portion of the rear wall portion of each divided piece (21), a concave portion (26) fitted to the extrusion nozzle (13) is provided. Then, as shown in FIG. 1B, in a state where the two split pieces (21) and (21) are combined with each other, it is formed by combining the concave portions (26) and (26) of the two split pieces (21) and (21). The extrusion nozzle (13) is fitted in the fitted state in the fitted hole! [0052] Further, the upsetting apparatus (10) includes a split piece combination device (200) for combining both split pieces (21) and (21) with each other so that a closing die (20) is formed, and a driving device ( 30) with! /

[0053] The split piece combination device (200) includes a pair of left and right fluid pressure cylinders (for example, hydraulic pressure or gas pressure series) as a drive source for moving both split pieces (21) (21) in the mutual approaching direction and the separating direction. (29) (29). Each segment (21) is connected to the rod (29a) of the fluid pressure cylinder (29). Each divided piece (21) is fixed on a pedestal (27) movable on an LM guide rail (28) extending in a direction perpendicular to the extrusion direction of the extruded material (1). (See Figures 2A and 2C). The two split pieces (21) (21) are installed on the same moving stage (32) via the corresponding cradle (27) and rail (28), respectively. The moving stage (32) is installed so as to be movable forward and backward in the extrusion direction of the extruded material (1). Note that (33) and (33) are rails of the moving stage (32).

As shown in FIG. 1B, this split piece combination device (200) operates the fluid pressure cylinders (29) (29) to move both split pieces (21) (21) in the mutually approaching direction. In addition, both the divided pieces (21) and (21) are combined with each other to form the closing die (20). Further, this split piece combining device (200) operates the fluid pressure cylinder (29) (29) to move both split pieces (21) (21) combined with each other in the mutual separation direction. The two split pieces (21) and (21) are separated from each other so that the closing die (1) can be divided into two pieces.

[0055] The drive device (30) is configured such that both the split pieces (21) (21) are combined with each other and the split pieces (2 1) (21) are pushed forward in the extrusion direction of the extruded material (1). It is for moving at a lower speed. Two fluid pressure cylinders (for example, hydraulic or gas pressure cylinders) (31) (31) are connected to the moving stage (32) as a drive source of the drive device (30). Then, as shown in FIGS. 1C and 1D, the drive device (30) operates both fluid pressure cylinders (31) and (31) to shorten the rods (31a) and (31a), thereby dividing both the cylinders. The pieces (21) and (21) are moved together with the moving stage (32) to the front of the extruded material (1) in the extrusion direction at a predetermined speed. Further, as shown in FIGS. 1E and 1F, the drive device (30) is operated by operating both fluid pressure cylinders (31) (31) to project the rods (31a) (31a). Both split pieces (21) (21) moved forward in the extrusion direction of the material (1) can be returned (moved) to the initial position. It is.

[0056] In the present invention, in addition to the above, the drive device (30) moves the extrusion port (15) of the extrusion nozzle (13) backward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed. It may be for. Further, in this case, the drive device (30) can return (move) the extrusion port (15) of the extrusion nozzle (13) that has been moved rearward in the extrusion direction of the extruded material (1) to the initial position. May be.

[0057] The cutting device (40) is configured to squeeze the expanded portion (6) of the extruded material (1) from the extruded material (1). ) To be held (3), or a portion of the extruded material (1) on the front side in the extrusion direction with respect to the to-be-clamped portion (3). The cutting device (40) has cutting blades (shear blade in detail) (41) and a cutting die (42) corresponding to each other. The cutting blade (41) and the cutting die (42) are opposed to the left and right sides of the extruded material (1) on the front side of the two split pieces (21) (21) (that is, the closing die (20)). It is arranged.

[0058] Fluid pressure cylinders (eg, hydraulic or gas pressure cylinders) (43) (43) are connected to the cutting blade (41) and the cutting die (42), respectively, as drive sources. Then, as shown in FIG. 1G, the fluid pressure cylinder (43) is actuated to project the rod (43a), so that the cut portion of the extruded material (1) is cut with the cutting blade (41) and the cutting die ( 42) is cut (sheared) by a cutting blade (41). On the other hand, by shortening the rod (43a) of the fluid pressure cylinder (43), the cutting blade (41) and the cutting die (42) are returned to their original positions. The cutting blade (41) and the cutting die (42) are fixedly attached to the frame (44) via the corresponding fluid pressure cylinders (43).

[0059] Next, an upsetting method using the upsetting apparatus (10) will be described below.

[0060] First, as shown in FIG. 1A, both divided pieces (21) (21) of the closing die (20) are arranged in a state of being separated from each other. Next, the heated billet (B) charged in the container part (12) of the extrusion device (11) is pressurized forward in the extrusion direction by the stem (16), thereby the extrusion port of the extrusion nozzle (13). (15) Force Extrude the extruded material (1). In the present embodiment, the extruded material (1) is extruded in the horizontal direction, for example. [0061] Then, as shown in FIG. IB, the extrusion port (15) force at the tip of the extrusion nozzle (13) is pushed with the cavity (15) at the tip of the extrusion nozzle (13). 25) The two split pieces (21) and (21) are combined with each other by the split piece combining device (200) so as to be disposed within. As a result, the closed die (20) is formed, and at the same time, the extruded material (1) extruded from the extrusion port (15) of the extrusion nozzle (13) is sandwiched between the split pieces (21) (21) (22) Clamp in cooperation with each other in (22) [Clamping process]. Then, the biting protrusion (23) of the sandwiching portion (22) of each divided piece (21) bites into the sandwiched portion (3) of the extruded material (1), thereby causing the extruded material (1) to move in the axial direction. Slip is prevented. On the other hand, a biting mark (7) corresponding to the biting protrusion (23) is generated in the sandwiched portion (3) of the extruded material (1) (see FIG. 1E).

[0062] By continuously extruding the extruded material (1), it was exposed between the extrusion port (15) of the extrusion nozzle (13) and the sandwiching portions (22) (22) of the two split pieces (21) (21). While filling the exposed part (2) of the extruded material (1) into the cavity (25) of the closing die (20), as shown in Fig. 1C and Fig. 1D, both split pieces (21) (21) In a state where the extruded material (1) is sandwiched between the clamping parts (22) and (22), that is, in a state where the two split pieces (21) and (21) are combined with each other, the drive unit (30) splits the two parts. The pieces (21) and (21) are moved forward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed. As a result, the exposed portion (2) of the extruded material (1) is expanded into the cavity (25) of the closing die (20) to expand the diameter [a diameter expansion step].

[0063] In this way, while the material of the exposed portion (2) of the extruded material (1) is filled into the cavity (25) of the closing die (20), both the split pieces (21) (21) are inserted into the extruded material ( The material flow in the cavity (25) is dispersed by moving it forward in the extrusion direction of 1) at a speed lower than the extrusion speed. Therefore, the material can be filled into the corner of the cavity (25) of the closing die (20) without excessively increasing the pushing force of the extrusion device (11). Therefore, it is possible to prevent a problem that an unfilled portion (that is, a portion not filled with material) is generated in the cavity (25). For this reason, it is possible to prevent the occurrence of shape defects such as a lack of defects and to obtain a high-quality upsetting product (5).

[0064] Further, since the corner portion in the cavity (25) of the closing die (20) can be filled without excessively increasing the pushing force of the extrusion device (11), the closing die can be used during processing. The load applied to (20) can be reduced. Therefore, the service life of the closing die (20) can be extended. it can.

[0065] In the present invention, the moving speed of the two split pieces (21) (21) by the drive device (30) may be lower than the extrusion speed of the extruded material (1), that is, the extruded material (1 ) Extrusion speed of less than 1 times. The speed difference between the moving speed of the two split pieces (21) and (21) and the extrusion speed of the extruded material (1) can be determined according to the shape of the enlarged diameter portion (6), that is, the shape of the cavity (25). . Further, the speed difference may be constant or changed. For example, the speed difference can be increased at a location where the diameter expansion amount is large, and the speed difference can be decreased at a location where the diameter expansion amount is small. That is, the moving speed of the two split pieces (21) (21) is appropriately set according to the shape of the cavity (25) of the closing die (20). It is set to a speed at which the material can be filled so that no unfilled part will occur in the area.

[0066] Here, in the clamping step, the extruded material (1) is placed at a position where the length of the exposed portion (2) of the extruded material (1) is equal to or shorter than the buckling limit length of the exposed portion (2). It is desirable that the two split pieces (21) (21) be clamped in cooperation with each other at the clamping portions (22) (22). By doing so, buckling of the extruded material (1) can be reliably prevented, and the exposed portion (2) of the extruded material (1) can be expanded in diameter.

[0067] Further, in the diameter expansion process, the force at the time of starting the clamping of the sandwiched portions (22) and (22) of the two split pieces (21) and (21) to the extruded material (1) in the sandwiching process both split pieces (21) It is desirable to set a time lag before the start of movement in (21). That is, first, as shown in FIG. 1B, in the clamping step, the extruded material (1) is clamped by the clamping sections (22) and (22) of both divided pieces (21) and (21). Then, in this sandwiched state, that is, in a state where the two divided pieces (21) and (21) are combined with each other, the two divided pieces (21) and (21) are not moved and moved to their positions (ie, initial positions). To wait for a predetermined time. This waiting time corresponds to the time lag. Then, as shown in FIG. 1C, the exposed portion (2) of the extruded material (1) is slightly expanded in the cavity (25) between the time lugs. Then, after the elapse of the time lag, as shown in FIG. 1D, the two divided pieces (21) (21) are moved forward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed. By setting the time lag as described above, the cross-sectional area of the exposed portion (2) of the extruded material (1) can be increased at the initial stage of diameter expansion. Therefore, the buckling limit length of the exposed portion (2) can be increased, and buckling can be prevented more reliably.

[0068] In the diameter expansion process, the material of the exposed portion (2) of the extruded material (1) is the cavity of the closing die (20). When (25) is completely filled and the exposed part (2) is expanded to the design shape (see Figure ID), the moving speed of both split pieces (21) and (21) is set to the extrusion of the extruded material (1). As shown in FIG. 1E, the two split pieces (21) and (21) are moved in the mutual separation direction by the split piece combining device (200) as shown in FIG. 1E. Separate (21). As a result, the sandwiched portions (22) and (22) of the two split pieces (21) and (21) are released from the extruded material (1) [nip release process]. Then, the expanded diameter portion (6) of the extruded material (1) moves forward in the extrusion direction by the pushing force of the extrusion device (1). In this embodiment, as shown in FIG. 1D, when the exposed portion (2) of the extruded material (1) is expanded to the designed shape, the position and the cavity of the extrusion nozzle (15) of the extrusion nozzle (13) (25) The position of the rear end is inconsistent. However, in the present invention, when the exposed portion (2) of the extruded material (1) is expanded in diameter to the design shape, the position of the extrusion port (15) of the extrusion nozzle (13) is the rear end of the cavity (25). It may be a forward position. In this case, the material of the exposed portion (2) is filled in the cavity (25) in such a manner as to wrap around the outside of the tip portion of the extrusion nozzle (13). Furthermore, in this case, the tip of the outer peripheral surface of the extrusion nozzle (13) is formed in a tapered shape, so that the tip of the extrusion nozzle (13) is extracted from the material in the cavity (25). Desirable in terms of ease.

Next, as shown in FIGS. 1E and 1F, both the split pieces (21) and (21) are returned (moved) to the initial position by the drive device (30) while being in a mutually separated state [returning step].

[0070] Then, as shown in FIG. 1G, by combining the two split pieces (21) (21) with each other by the split piece combining device (200), the closed die (20) is formed again, and at the same time, the extruded material ( 1) is sandwiched again by the clamping portions (22) and (22) of both divided pieces (21) and (21) [Clamping process]. Next, the above-described diameter expansion process, clamping release process, and return process are sequentially repeated.

In the present embodiment, the extrusion material (1) is continuously applied at a predetermined speed at the extrusion port (15) of the extrusion nozzle (13) while the clamping process, the diameter expansion process, the clamping release process, and the return process are repeated. And pushed out. However, in the present invention, the extrusion of the extruded material (1) may be stopped during this time. Further, the extrusion speed of the extruded material (1) may be constant or may be changed.

[0072] When the upsetting force is repeatedly performed in this way, the sandwiching portion of the two split pieces (21) (21) is the same in the second and subsequent diameter expansion processes as in the first diameter expansion process. (22) Extruded material of (22) Force at start of clamping to (1) Both split pieces (21) A time lag is set between the start of movement of (21). However, during this time lag, as shown in FIG. 1G, the sandwiched portion (3) of the extruded material (1) sandwiched by the sandwiched portions (22) (22) of the two split pieces (21) (21). Extrusion that was clamped by the clamping parts (22) and (22) of the two split pieces (21) and (21) during the previous diameter-expansion process as the part ahead of the extrusion direction (current clamping part (3)) The sandwiched portion (3) of the material (1) (that is, the previous sandwiched portion (3)) is cut (sheared in detail) by the cutting device (40) [Cutting step]. This cutting method will be described in detail. The cutting blade (41) and the cutting die (42) of the cutting device (40) are moved in the mutually approaching direction, and the cutting planned portion of the extruded material (1) (that is, the previous sandwiched portion). (3)) is sandwiched between the cutting blade (41) and the cutting die (42), and the planned cutting portion is cut by the cutting blade (41). When this cutting step is performed in the third and subsequent diameter expansion steps, the expanded diameter portion (6) is separated from the extruded material (1).

[0073] In the present embodiment, the cut portion of the extruded material (1) is, as described above, the clamping portion (22) (22) of the two split pieces (21) (21) during the previous diameter expansion process. This is a sandwiched portion (3) of the extruded material (1) that has been sandwiched. Since the biting part (3) is formed with a bite mark (7) !, it is easy to cut by cutting with the cutting device (40) using the part to be pinched (3) as a planned cutting part. Can be done. In the present invention, it is desirable that the anti-slip means can form a bite mark having a shape that facilitates cutting. As such an anti-slip means, a biting protrusion protruding in a cross-section V shape (for example, a wedge shape) is provided on the clamping part (22) of the split piece (21), and Z or the clamped part (3) Holding the biting protrusions (particularly preferably the biting protrusions protruding in a V-shaped cross section) that can form biting marks over more than half of the total circumference of the two pieces (21) (21) Part (22) It can be provided in (22).

By performing this cutting step for each diameter expansion step, an upsetting force product (5) having one diameter expansion portion (6) as shown in FIG. 3 can be obtained. Alternatively, by performing this cutting step every other or twice or more of the repeated diameter expansion steps, an upsetting product (2) having two or more diameter expansion portions (6) (see FIG. Not shown).

[0075] The upsetting product (5) thus obtained is used as a preform having a shape as close as possible to the desired product shape.

[0076] Thus, according to the upsetting method of the above embodiment, the extruded material (1) is produced by extrusion. And the step of upsetting the extruded material (1) can be performed continuously. Therefore, the productivity of the upsetting product (5) can be improved.

[0077] Further, the pushing force of the extrusion device (11) is used as a force for pressing the extruded material (1) in the axial direction in order to increase the diameter of the exposed portion (2) of the extruded material (1) (that is, the diameter expansion planned portion). Since the output is used, it is used in the conventional upsetting method and does not require a punch for pressing the material in the axial direction and its driving device. Therefore, the upsetting apparatus (10) can be simplified.

[0078] Of course, since the exposed portion (2) of the extruded material (1) is enlarged in the cavity (25) of the closing die (20), a preform having a shape as close as possible to the desired product shape must be manufactured. As a result, the material yield can be improved and the number of manufacturing steps can be reduced.

[0079] Further, since the sandwiching process, the diameter expanding process, the sandwiching releasing process, and the returning process are sequentially repeated, the productivity of the upsetting product (5) can be further improved.

[0080] Further, the following effects are obtained by cutting the extruded material (1) during the time lag.

That is, if the planned cutting part is moved when the planned cutting part of the extruded material (1) is moved, various problems such as deformation of the cut end and the cutting part occur. Therefore, in order to prevent this problem from occurring, in this embodiment, the extruded material (1) is cut during the time lag. By doing this, when cutting the cut portion of the extruded material (1), the cut portion of the extruded material (1) moves, so that such a problem does not occur. Can be cut well, and the portion to be cut can be easily cut.

[0081] Further, since the extruded material (1) can be cut while extruding the extruded material (1) by the extrusion device (11), it is possible to save the installation space of the upsetting device (10). it can.

[0082] Further, the sandwiching portions (22) and (22) of the two split pieces (21) and (21) are provided with biting projections (23) to the extruded material (1) as anti-slip means, respectively. As a result, the extruded material (1) can be prevented from slipping, and the extruded material (1) can be pinched.

[0083] Of course, since the extruded material (1) does not buckle, it is possible to provide a V and high-quality upsetting force product that does not have a defective shape such as a crease or a fog.

Although one embodiment of the present invention has been described above, the present invention is not limited to that shown in the above embodiment. It is not limited.

[0085] For example, in the present invention, a cutting blade (40) is provided as a cutting device (40) in the sandwiching portion (22) of at least one of the divided pieces (21) (21). Under the condition that the extruded material (1) is clamped by the both clamping parts (22) and (22) of both split pieces (21) and (21), the clamped part (3) of the extruded material (1) is You can cut it.

In the present invention, the number of divisions of the closing die (20) is not limited to two, but may be three or four or more.

[0087] In the above embodiment, the extrusion direction of the extruded material (1) by the extrusion device (11) is the horizontal direction. In the present invention, the extrusion direction of the extruded material (1) is, for example, the downward direction. It may be in the vertical direction.

[0088] In the above-described embodiment, the position of the extrusion port (15) of the extrusion nozzle (13) is fixed in the diameter expansion step, and the clamping portions (22) of the plurality of divided pieces (21) (21) are fixed. ) By moving the plurality of divided pieces (21) and (21) forward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed while holding the extruded material (1) at (22). The exposed part (2) of the material (1) is enlarged in the cavity (25). However, in the present invention, in addition, in the diameter expanding step, the plurality of divided pieces in a state where the extruded material (1) is held by the holding portions (22) (22) of the plurality of divided pieces (21) (21). (21) By fixing the position of (21) and moving the extrusion port (15) of the extrusion nozzle (13) backward in the extrusion direction of the extrusion material (1) at a speed lower than the extrusion speed, The exposed part (2) of 1) can be expanded in the cavity (25).

[0089] The above two upsetting methods are summarized as follows. That is, in the present invention, in the diameter expansion step, the extrusion port (15) force of the extrusion nozzle (13) is also pushed out of the extruded material (1) by the extrusion device (11), whereby the extrusion port (13) Fill the cavity (25) with the material of the exposed part (2) of the extruded material (1) exposed between 15) and the clamping parts (22) (22) of the multiple divided pieces (21) (21). While the extruded material (1) is sandwiched between the sandwiched portions (22) and (22) of the plurality of divided pieces (21) and (21), the plurality of divided pieces (21) and (21) are extruded into the extruded material (1). The exposed part (2) of the extruded material (1) is moved to the cavity (25) by moving it relative to the extrusion port (15) of the extrusion nozzle (13) at a speed lower than the extrusion speed. ) Expand the diameter inside.

[0090] In the above-described embodiment, the drive device (30) combines the two divided pieces (21) (21) with each other. In this state, the two split pieces (21) (21) are moved forward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed. The drive device (30) Both split pieces (21) (21) moved to the front in the extrusion direction of the material (1) can be returned (moved) to the initial position. However, in the present invention, in addition, the drive device (30) is for moving the extrusion port (15) of the extrusion nozzle (13) backward in the extrusion direction of the extruded material (1) at a speed lower than the extrusion speed. It may be. Furthermore, in this case, the drive device (30) can return (move) the extrusion port (15) of the extrusion nozzle (13) moved to the rear in the extrusion direction of the extruded material (1) to the initial position. It ’s okay to be done.

[0091] The above-mentioned two upsetting devices are summarized as follows. That is, in the present invention, the driving device (30) is configured to push the plurality of divided pieces (21) (21) by the extrusion device (11) in a state where the plurality of divided pieces (21) (21) are combined with each other. The material (1) may be moved forward relative to the extrusion port (15) of the extrusion nozzle (13) at a lower speed than the extrusion speed in the extrusion direction. Returns the divided pieces (21) (21) moved relative to the extrusion opening (15) of the extrusion nozzle (13) to the initial position in the extrusion direction of the extruded material (1). It may be made a thing.

[0092] Further, between the two split pieces (21) (21) (that is, the closing die (20)) and the cutting device (40), the extruded material

A support member (not shown) that supports the extruded material (1) may be disposed as means for preventing bending (eg, stagnation) due to its own weight or the like in (1). In this case, it is desirable that the support member be movable together with the extruded material (1).

In the present invention, the upsetting force may be measured by attaching a release agent or a lubricant to the inner surface of the cavity (25) of the closing die (20).

[0094] This application is based on Japanese Patent Application No. 2005-224969 filed on August 3, 2005, and US Provisional Application 60Z706, 783 filed on August 10, 2005. Therefore, the disclosure content thereof constitutes a part of the present application as it is.

[0095] The terms and expressions used herein are for illustrative purposes only and are not intended to be limiting. Within the claimed scope of the present invention. It should be recognized that various modifications are also allowed.

[0096] While this invention may be embodied in many different forms, this disclosure is to be considered as providing examples of the principles of the invention, and these examples are Numerous illustrated embodiments are described herein with the understanding that the present invention is not intended to be limited to the preferred embodiments illustrated and illustrated herein or Z or illustrated.

[0097] The Forces Described herein for the Illustrative Embodiments of the Present Invention The present invention is not limited to the various preferred or described embodiments described herein, but is based on this disclosure. It encompasses any and all embodiments with equivalent elements, modifications, deletions, combinations (eg, combinations of features across various embodiments), improvements, and Z or changes that may be recognized by those skilled in the art. Claim limitations should be construed broadly based on the terms used in the claims, and should not be limited to the embodiments described herein or in the process of this application. Examples should be interpreted as non-exclusive.

Industrial applicability

The present invention can be used in an upsetting method and an upsetting apparatus used for manufacturing a product having an enlarged diameter portion such as a vehicle arm, a connecting rod, and a piston.

Claims

The scope of the claims

[1] Using an extrusion apparatus having an extrusion nozzle provided with an extrusion port at the tip, and a closed die having a cavity and divided into a plurality of parts,

The upsetting method characterized by including.

[2] The sandwiching step includes sandwiching the extruded material with the sandwiching portions of the plurality of divided pieces at a position where the length of the exposed portion of the extruded material is equal to or less than the buckling limit length of the exposed portion. Up-setting method.

[3] In the diameter expansion step, a time lag is set between the start of movement of the plurality of divided pieces until the start of movement of the plurality of divided pieces in the holding step. The upsetting method described in 1.

[4] In a state where the extruded material is sandwiched between the plurality of divided pieces during the time lag.

4. The upsetting method according to claim 3, wherein the sandwiched portion of the extruded material or the portion on the front side in the extrusion direction from the sandwiched portion is cut.

[5] The upsetting method according to any one of claims 1 to 4, wherein an anti-slip means is applied to a sandwiching portion of at least one of the plurality of divided pieces.

6. The upsetting method according to claim 5, wherein a sandwiching protrusion for the extruded material is provided as the anti-slip means in the sandwiching portion of the at least one divided piece.

[7] After the diameter expanding step, the holding of the holding portions of the plurality of divided pieces to the extruded material is released. Process,

5. The upsetting method according to any one of claims 1 to 4, wherein the clamping step, the diameter expanding step, the clamping release step, and the return step are sequentially repeated.

[8] An upholstery product obtained by the upsetting method according to claim 1.

[9] An extrusion apparatus having an extrusion nozzle provided with an extrusion port at the tip, and for extruding an extrusion loci extrusion material of the extrusion nozzle;

A closing die having a cavity and divided into a plurality of parts;

In a state where the plurality of divided pieces are combined with each other, the plurality of divided pieces are moved relative to the extrusion port of the extrusion nozzle at a lower speed than the extrusion speed in the extrusion direction of the extruded material by the extrusion device. A driving device;

With

The plurality of divided pieces are each provided with a clamping portion,

10. The installation according to claim 9, further comprising a cutting device that cuts a sandwiched portion of the extruded material sandwiched by the sandwiching portions of the plurality of divided pieces or a portion on the front side in the extrusion direction from the sandwiched portion. Embedded processing equipment.

[11] The upsetting apparatus according to [9] or [10], wherein an anti-slip means is applied to a sandwiching portion of at least one of the plurality of divided pieces.

12. The upsetting apparatus according to claim 11, wherein a sandwiching protrusion for the extruded material is provided as the anti-slip means in the sandwiching portion of the at least one divided piece.

[13] The divided piece combining device is further configured to separate the plurality of divided pieces combined with each other. The drive device is further configured to return the plurality of divided pieces moved relative to the extrusion port of the extrusion nozzle to the initial position in front of the extrusion material in the extrusion direction. The upholstery device described.