JP2005297019A - Forging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forging method, which improves productivity by press-molding of two pieces of works to be forged at one time in one pressurizing step. <P>SOLUTION: By lowering an upper outer ram 8 vertically downward, press-molding of a member 17 to be forged is carried out in the pressurizing straight axis direction with a lower-part lower-die 6 and a lower-part upper-die 15, and press-molding of a member 16 to be forged is simultaneously carried out with an upper-part lower-die 11 and an upper-part upper-die 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a forging method.

For example, when a piston for an internal combustion engine is manufactured by a forging method, as an example of the related art, a cylinder made of a columnar aluminum alloy is interposed between a lower mold and a cylindrical mold member provided on the outer periphery thereof. The forged member was placed, and the upper die was pushed down vertically from above to pressurize the forged member to form a piston shape (see, for example, Patent Document 1).
JP 2000-24747 A

  By the way, in the conventional forging method as described in Patent Document 1 described above, only one member to be forged can be formed in one pressurizing process in which the upper die is pushed down vertically, which increases productivity. was difficult.

  Accordingly, an object of the present invention is to provide a forging method capable of forming a plurality of to-be-forged members at a time in one pressurizing step and improving productivity.

  In order to achieve the above-mentioned object, the present invention is arranged in a vertical direction by a lower / lower mold fixedly installed on the lower surface and a vertically movable upper body of the lower / lower mold. A movable upper / lower mold, and an upper / lower mold that is disposed between the upper / lower mold and the lower / lower mold and has upper / lower molds corresponding to the upper / lower molds on the upper surface side. A mold holding plate having lower and upper molds corresponding to the lower and lower molds on the side, and an upper surface side are fixed to the moving body, and the mold holding plate is inserted in a vertically movable manner. And a forging method using a forging device comprising a plurality of mold holding plate guide shafts provided with locking portions for locking the mold holding plate so as not to fall off on the lower surface side, wherein the movable movement The upper and lower molds are moved vertically upward by a body, and each of the above fixed to the moving body By moving the mold holding plate guide shaft vertically upward, the mold holding plate locked by the locking portion is also moved vertically upward at the same time, so that the mold holding plate is moved to the upper and lower molds and the lower side. The first step of positioning in the space between the lower mold and the first and second forged members set in the lower / lower mold and the upper / upper mold, respectively, and then moved. The upper and lower molds are moved vertically downward by the movable body, and the mold holding plates are also vertically lowered simultaneously by the vertical downward movement of the mold holding plate guide shafts fixed to the movable body. And press-molding the first forged member with the lower / lower mold and the lower / upper mold, and the upper / lower mold with the upper / upper mold And a second step of pressure-molding the second forged member.

  According to the present invention, the first forged member is added by the lower / lower mold and the lower / upper mold in the pressurizing straight axis direction in one pressurizing step of moving the moving body vertically downward. In addition to pressure forming, the second forged member can be pressure formed by the upper / lower mold and the upper / upper mold, so that one forged object can be formed in a single pressing step as in the prior art. Compared with the case where the member is pressure-molded, the productivity is improved about twice, and the production cost can be greatly reduced.

  Hereinafter, the present invention will be described based on the illustrated embodiments.

  FIG. 1 is a schematic cross-sectional view showing a forging apparatus that performs forging by a forging method according to an embodiment of the present invention. A bolster 4 fixed on a plurality of support bases 3 installed on the installation surface 2 is provided at the lower portion of the forging device 1, and a lower ram 5 and a lower / lower mold 6 are attached to the bolster 4. ing.

  Further, an upper outer ram 8 is installed on the upper side of the plurality of guide shafts 7 supported on the bolster 4 at the upper part of the forging device 1 so as to be movable up and down. The upper and lower molds 11 are mounted via the upper and lower mold mounting plates 10. The upper / lower mold mounting plate 10 and the upper / lower mold 11 are integrally formed, and the upper / lower mold mounting plate 10 is fixed to the lower surface of the upper outer ram 8. The upper outer ram 8 is configured to move up and down along the guide shaft 7 by driving of a driving device (not shown) such as a hydraulic cylinder. The lower ram 5 and the upper inner ram 9 have knockout pins 5a and 9a that can be pushed out.

  The upper end side of a plurality of upper mold base guides 12 is fixed to the lower surface of the upper outer ram 8, and the upper mold base 13 is inserted through the upper mold base guide 12 so as to be movable up and down. A locking portion 12a is provided on the lower surface of the upper mold base guide 12 so that the upper mold base 13 does not fall off. That is, the upper mold base 13 that is movable in the vertical direction is suspended in a state of being locked by the locking portion 12a of the upper mold base guide 12 in a normal state. The guide shaft 7 and the upper mold base guide 12 are installed in the vertical direction.

  Upper and upper molds 14 corresponding to the upper and lower molds 11 are assembled on the upper surface of the upper mold base 13, and lower and lower molds corresponding to the lower and lower molds 6 are mounted on the lower surface of the upper mold base 13. An upper mold 15 is assembled.

  Next, a forging method using the forging device 1 described above will be described with reference to FIGS.

  As shown in FIG. 2, when the upper outer ram 8 is moved upward to the vicinity of the uppermost portion of the guide shaft 7 by driving a driving device (not shown), the upper mold base guide 12 is moved upward together with the upper outer ram 8. By moving, the upper mold base 13 locked by the locking portion 12a also moves upward. In this state, the upper mold base 13 is positioned between the upper / lower mold 11 and the lower / lower mold 6, so that the upper mold base 13 is located between the upper / lower mold 11 and the upper / upper mold 14. Spaces are formed between the upper mold 15 and the lower and lower molds 6 respectively. In this state, a forged member (billet) 16 made of, for example, a columnar aluminum alloy is placed on the upper / upper mold 14, and, for example, from a columnar aluminum alloy in the recesses of the lower / lower mold 6. A forged member (billet) 17 is inserted.

  As shown in FIG. 3, the upper outer ram 8 is fixed to the upper outer ram 8 by moving the upper outer ram 8 downward from the vicinity of the uppermost portion of the guide shaft 7 by driving a driving device (not shown). Together with the mold base guide 12, the upper mold base 13 also descends vertically downward, and the lower mold / upper mold 15 of the upper mold base 13 comes into contact with the forged member 17.

  As shown in FIG. 4, the upper and lower molds 11 abut against the forged member 16 as the upper outer ram 8 further descends in the vertical direction. At this time, since the lower and upper molds 15 are in contact with the forged member 17, only the upper mold base guide 12 is lowered by the lowering amount of the upper outer ram 8. From this point, the pressurizing operation for each of the forged members 16 and 17 is started substantially simultaneously.

  Then, as shown in FIG. 5, by further lowering the upper outer ram 8 in the vertical direction from the state of FIG. 4, the forged member 16 is pressure-formed by the upper / lower mold 11 and the upper / upper mold 14. The forged member 17 is pressure-formed (forged) by the lower / lower mold 6 and the lower / upper mold 15 almost simultaneously, and desired molded products 16a and 17a are obtained, respectively. The operations shown in FIGS. 2 to 5 are performed continuously.

  When the molded products (forged products) 16a and 17a are obtained by the operation in FIG. 5, the upper outer ram 8 is moved upward to the vicinity of the uppermost portion of the guide shaft 7 by driving of a driving device (not shown). First, the upper and lower molds 11 are moved upward and separated from the upper and upper molds 14, and the upper mold base 13 is moved upward by the upper mold base guide 12 that is further moved upward integrally. The lower / upper mold 15 is separated from the lower / lower mold 6 (returns to the state before the forging operation starts shown in FIG. 2).

  Then, from this state, as shown in FIG. 6, the knockout pin 9a of the upper inner ram 9 is extended to push out the molded product 16a remaining in the upper and lower molds 11, and the knockout pin 5a of the lower ram 5 is extended. The molded product 17a remaining in the lower and lower molds 6 is pushed out. After the extruded molded products 16a and 17a were taken out and a series of pressure forming (forging) operations were completed, the next forged member (billet) was set in the same manner as described above, and shown in FIGS. Repeat the operation.

  In this way, in one pressurizing step for lowering the upper outer ram 8 vertically downward, two to-be-forged members (billets) can be press-formed (forged) simultaneously in the direction of the pressure straight axis. Therefore, productivity is improved by about twice as compared with the case where one forged member is press-molded in one pressurizing step as in the prior art, and the production cost can be greatly reduced accordingly. .

  The forging method according to the present invention described above can be applied to any forging such as cold forging, warm forging, and hot forging.

The schematic sectional drawing which shows the forging apparatus which forges with the forging method which concerns on embodiment of this invention. The figure for demonstrating the forge method which concerns on embodiment of this invention. The figure for demonstrating the forge method which concerns on embodiment of this invention. The figure for demonstrating the forge method which concerns on embodiment of this invention. The figure for demonstrating the forge method which concerns on embodiment of this invention. The figure for demonstrating the forge method which concerns on embodiment of this invention.

Explanation of symbols

1 Forging device 4 Bolster 6 Lower / lower die 7 Guide shaft 8 Upper outer ram (moving body)
11 Upper and lower molds 12 Upper mold base guide (mold holding plate guide shaft)
13 Upper mold base (mold holding plate)
14 Upper / Upper mold 15 Lower / Upper mold

Claims (1)

Lower and lower molds fixed on the lower surface,
Upper and lower molds that are arranged vertically opposite to the lower and lower molds and are movable in the vertical direction by a connected moving body,
Arranged between the upper and lower molds and the lower and lower molds, and has upper and upper molds corresponding to the upper and lower molds on the upper surface side and corresponds to the lower and lower molds on the lower surface side. A mold holding plate having lower and upper molds,
A plurality of dies having an upper surface side fixed to the movable body, the dies holding plate being movably inserted in the vertical direction, and a locking portion for locking the dies holding plate so as not to fall off on the lower surface side. A forging method using a forging device comprising a holding plate guide shaft,
The upper and lower molds are moved vertically upward by the movable body that is moved, and the locking portions are engaged by the vertical upward movement of the mold holding plate guide shafts fixed to the movable body. A first step of simultaneously moving the stopped mold holding plate vertically upward to position the mold holding plate in a space between the upper and lower molds and the lower and lower molds;
After setting the first and second forged members in the lower and lower molds and the upper and upper molds, respectively, the upper and lower molds are moved vertically downward by the movable body moved, The lower and lower molds and the lower and upper molds are moved vertically by the vertical movement of the mold holding plate guide shafts fixed to the movable body. And a second step of pressure forming the second forged member with the upper and lower molds and the upper and upper molds. Have
A forging method characterized by that.

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