JP2004114086A - Forging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forging device for forging a work of excellent quality free from any thickness deviation. <P>SOLUTION: In the forging device comprising a fixed die 31 having a die to demarcate a carving space 33 to charge a work W1 before forging on an inner circumference and a moving die 21 having a punch 22 facing the carving space 33 of the fixed die, the fixed die 31 has a work holder 35 protruded in the carving space 33 in a state before charging the work, and the work holder 35 is accommodated in the die during the forging. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a forging device provided with a die for charging a workpiece before molding, and more particularly to a forging device capable of supporting a loaded workpiece in a proper posture.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a steel part is formed, it is often performed to perform a rough forming by forging and then a finish forming by cutting. Here, as shown in FIG. 1, for example, in the case of forming a cylindrical molded product W3 ((D) in FIG. 1), forging is performed by first forming a columnar raw material W0 ((A) in FIG. 1) obtained by cutting a wire into an axis. The disk material W1 (FIG. 1A) is formed by pressing in the direction, and then, the vicinity of the axis of the disk material W1 is further pressed in the axial direction to have the partition 6 near the axis. A cup forged product W2 (FIG. 1 (c)) having a substantially H-shaped cross section was formed, and finally, the partition wall 6 of the cup forged product W2 was punched out to form a cylindrical cylindrical molded product W3.
[0003]
Here, in the forging process, a forging process of forming a cup forged product W2 from a plate-shaped disk material W1 as a work, and a forging apparatus used in the process will be described with reference to FIGS.
[0004]
First, the forging device 111 will be described with reference to FIG. 6. Reference numeral 131 denotes a fixed die, which includes a die 132 that defines a die engraving space 133 into which the disc material W1 is charged, and a knockout pin 135. The knockout pin 135 is disposed near the axis of the die 132 so as to be able to advance and retreat with respect to the engraving space 133, and has the same end shape as one end of the desired cup forged product W2 due to the end surface of the knockout pin 135 and the inner bottom surface of the die 132. A shaped molding surface 134 is formed. Reference numeral 121 denotes a movable die having a punch 122 and a pin 123 disposed near the axis of the punch 122. The end faces of the punch 122 and the pin 123 are the same as the other end face shape of the desired cup forged product W2. The pressing surface 124 has a shape. Then, the punch 122 and the pin 123 are disposed at a position facing the engraving space 133 of the fixed die 131 so as to be able to advance and retreat.
[0005]
When the cup forging W2 is formed from the disk material W1 by the forging device 111, first, the disk material W1 is put into the engraving space 133 of the fixed die 131, and is placed at a regular position of the die 132 in a substantially horizontal state. Then, the movable die 121 is lowered and the disk material W1 is pressed between the die 132 and the forming surface 134 of the knockout pin 135 and the pressing surface 124 of the punch 122 and the pin 123, and as shown in FIG. Had formed.
[0006]
[Problems to be solved by the invention]
As described above, by pressing the disk material W1 in the axial direction between the fixed die 131 and the movable die 121, a desired cup forging W2 can be easily formed. However, when the disc material W1 is inserted into the die-cut space 133, the outer peripheral portion of the disc material W1 comes into contact with the inner peripheral surface of the die 132, and the disc material W1 is inclined as shown in FIG. May not be placed. When the forging is performed in such a state that the disc material W1 is inclined, the pressing load of the punch 122 and the pin 123 is unevenly applied to the end face of the disc material W1, and uneven thickness with uneven thickness may occur. Was.
[0007]
Accordingly, an object of the present invention is to solve the problems described above and to provide a forging apparatus capable of forming a high-quality workpiece without uneven thickness.
[0008]
[Problems to be solved by the invention]
The configuration of the present invention is as follows.
[0009]
1 In a forging device comprising a fixed die having a die for defining a die-sinking space into which a workpiece before molding is to be put on the inner periphery, and a movable die having a punch arranged opposite to the fixed die-sinking space, The fixed mold includes a work holder that projects into the die-sinking space before the work is put in, and the work holder is stored in the die during forging.
[0010]
2. In the forging apparatus according to claim 1, the work holder has a function of discharging the forged work to the outside of the die.
[0011]
(3) In the forging device according to any one of (1) and (2), the work holder is urged toward the die-sinking space by an elastic member.
[0012]
【Example】
An embodiment of the present invention will be described below with reference to FIGS.
[0013]
FIG. 1 shows a step of forming a cylindrical molded product W3. First, a columnar material W0 (FIG. 1A) obtained by cutting a wire is pressed in the axial direction to obtain a plate-like disk W1 (see FIG. 1). 1 (a)) is formed, and then the vicinity of the axis of the disk material W1 is further pressed in the axial direction, so that the central small groove 5 having a shallow central hole 5 having a shallow hole and a deep hole near the axis with the partition wall 6 interposed therebetween. A cup forged product W2 ((c) in FIG. 1) having a substantially H-shaped section with the central large groove 4 recessed is formed, and finally the partition wall 6 of the cup forged product W2 is punched out to form a cylindrical cylindrical molded product W3. I do.
[0014]
Here, a process of forming a cup forged product W2 from the disk material W1 as a work using the forging apparatus according to the embodiment of the present invention will be described with reference to FIGS.
[0015]
First, the forging apparatus 11 will be described with reference to FIG. 2. Reference numeral 31 denotes a fixed die, in which a substantially cup-shaped die 32 having a through hole in the vicinity of the axis, and a long shaft portion 36a at one end on the inner peripheral side of the die 32 are inserted. And a die holding space 35 is defined by the die 32 and the work holder 35. The die 32 is supported by a cylindrical first support die 38, a second support die 39, and a base 42 which are concentrically arranged. A flange 36b protruding to the vicinity of the outer periphery is fitted and inserted, the other end short-axis portion 36c of the work holder 35 is fitted to the inner periphery of the second support die 39 via a spring 37, and the base 42 A knock auxiliary pin 43 that is arranged concentrically with the work holder 35 is inserted into the inner peripheral side. Here, the work holder 35 is held in a state in which the flange portion 36b is pressed toward the engraving space 33 by the spring 37, and the long shaft portion 36a projects into the engraving space 33 for a predetermined length.
[0016]
Reference numeral 21 denotes a movable die having a punch 22 and a pin 23 arranged near the axis of the punch 22. The end faces of the punch 22 and the pin 23 are the same as the other end face shape of the desired cup forged product W2. The pressing surface 24 has a shape. The punch 22 and the pin 23 are integrally fixed to a slide 27 that can move in the axial direction by a punch holder 26. Then, the punch 22 is disposed at a position facing the engraving space 33 of the fixed die 31.
[0017]
When the cup forging W2 is formed from the disk material W1 by the forging device 11, the disk material W1 that has been pre-processed by a transfer device (not shown) is horizontally moved to a position facing the engraving space 33 of the fixed die 31. It is conveyed and thrown into the molding space 33. As shown in FIG. 3, the inserted disk material W1 is placed on a work holder 35 protruding near the entrance of the engraving space 33 and supported while maintaining the horizontal state. Thereafter, the movable die 21 is lowered, and the punch 22 and the pressing surface 24 of the pin 23 come into contact with the disk material W1, and at the same time, the forging is started while the work holder 35 moves toward the knock assist pin 43. Then, as shown in FIG. 4, the movable die 21 is lowered until the work holder 35 comes into contact with the knock assist pin 43, and forging is completed in a state where the work holder 35 is housed inside the die 32. A forged product W2 is formed. Subsequently, as shown in FIG. 5, after the movable mold 21 is finally retracted upward, the knock assist pin 43 moves to the die-cutting space 33 side, and the work holder 35 also integrally comes into contact with the die 32 with the flange 36 b. It moves to the position where it contacts, and the cup forging W2 is taken out from the die-cutting space 33 of the fixed die 31, and this step is completed.
[0018]
Therefore, by using the forging device 11 that includes the work holder 35 that projects into the die-sinking space 33 before the disc material W1 is charged, and the work holder 35 is housed inside the die 32 during forging. The disk material W1 put into the die-cutting space 33 of the die 32 can be arranged in a regular posture near the inlet on the loading side.
[0019]
As described above, it is not necessary to provide a separate discharge device by providing the work holder 35 with a function of discharging the forged cup forged product W2 to the outside of the die 32. A discharging device may be provided separately from 35.
[0020]
Further, as described above, the work holder 35 is urged toward the engraving space 33 by the spring 37 so that the state in which the work holder 35 protrudes into the engraving space 33 can be maintained. Any means may be used as long as the means for urging the holder is irrespective of electrical or mechanical.
[0021]
【The invention's effect】
ADVANTAGE OF THE INVENTION As mentioned above, according to this invention, it has the fixed type | mold provided with the die which defines the engraving space which inserts the workpiece | work before shaping | molding in the inner periphery, and the punch arrange | positioned facing the engraving space of a fixed type. In a forging device consisting of a movable die, the fixed die is provided with a work holder that projects into the die engraving space before the workpiece is put in. The work holder is stored inside the die during forging, so the die die engraving is performed. Since the work put into the space can be arranged in a normal posture, a work of good quality can be formed without uneven thickness due to forging.
[0022]
In the above-described forging device, if the work holder has a function of discharging the work after forging to the outside of the die, it is not necessary to provide a separate discharging device, and the structure of the forging device can be simplified.
[0023]
In the above-described forging device, when the work holder is urged toward the die-sinking space by the elastic member, the forging device of the present invention can be realized with a simpler structure.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view showing a forging process of a general steel part.
FIG. 2 is a partial cross-sectional plan view showing a state before a workpiece is put into a forging device according to an embodiment of the present invention.
FIG. 3 is a partial cross-sectional plan view showing a state after a work is put into a forging device according to an embodiment of the present invention.
FIG. 4 is a partial cross-sectional plan view illustrating a state after forging by a forging device according to an embodiment of the present invention.
FIG. 5 is a partial cross-sectional plan view illustrating a state in which a forged workpiece is discharged from a forging apparatus according to an embodiment of the present invention.
FIG. 6 is a partial cross-sectional plan view showing a state before a workpiece is put into a conventional forging device.
FIG. 7 is a partial cross-sectional plan view illustrating a state after a workpiece is put into a conventional forging device.
FIG. 8 is a partial cross-sectional plan view showing a state in which a work after forging is discharged from a conventional forging device.
[Explanation of symbols]
21 movable mold 22 punch 31 fixed mold 32 die 33 engraving space 35 work holder 37 elastic member

Claims (3)

A fixed die (31) having a die (32) defining an engraving space (33) into which an unformed workpiece is to be placed, and a die engraving space (33) of the fixed die (31). In a forging device comprising a movable die (21) provided with a punch (22) to be arranged, the fixed die (31) is a work holder (35) projecting into a die-cutting space (33) in a state before the work is put. Wherein the work holder (35) is housed inside the die (32) during forging. The forging apparatus according to claim 1, wherein the work holder (35) has a function of discharging the forged work to the outside of the die (32). 3. The forging device according to claim 1, wherein the workpiece holder is urged by the elastic member toward the engraving space. 4.

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