JP3654673B2 - Forging equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a forging device for forging a metal material, and more particularly to a forging device having a knockout pin for taking out a forged molded product from a mold.
[0002]
[Prior art]
A forging device generally includes a stationary mold having a mold engraving space for introducing a metal material and a moving mold capable of moving back and forth with respect to the stationary mold, and statically removes the metal material introduced into the mold engraving space of the stationary mold. After pressing the molded product by pressing between the mold and the moving mold, the molded product was pushed out of the mold carving space by a knockout pin inserted into the static mold. In such a forging device, in particular, a pair of forging devices in the vertical direction, when a metal material is put into the die-cutting space of the static mold located on the lower side, the metal material is forged in a state regulated in the die-cutting space. There was no need to support metal materials separately.
[0003]
On the other hand, even in a pair of vertical forging devices, if the metal material cannot be regulated in the mold engraving space, for example, when the mold engraving space is much larger than the metal material or a pair of horizontal forging devices like Houma Then, a support for supporting the metal material was necessary. There are many forging devices equipped with a support in this manner, such as Japanese Patent Publication No. 55-30939.
[0004]
[Problems to be solved by the invention]
As described above, in the forging device provided with the support tool, the metal material sandwiched by the support tool can be pressed and inserted into the die-sculpting space, so that the metal material can be reliably forged and formed. However, in order to press the metal material sandwiched by the support and insert it into the mold carving space, the metal material may be a columnar shape that extends straight in the axial direction, but the metal material is bent or has a convex part on the outer periphery. There were times when it could not be used.
[0005]
Therefore, there is a forging device 110 as shown in FIG. This forging device 110 has a static die carving space 133 into which a metal material (intermediate molded product W2) is placed, and a static die having a knockout pin 135 that can slide back and forth with respect to the static die carving space 133. 131 and a moving die 111 having a movable die-sculpting space 114 at the bottom and provided with a punch 116 that can slide back and forth with respect to the dynamic die-sculpting space 114, and the stationary die 131 slides on the knockout pin 135. A resistance material 139 for providing resistance is provided, and the moving mold 111 is provided with a spring 120 for biasing the punch 116 forward. In addition, the forging device 110 includes a support 151 that supports a metal material (intermediate molded product W2).
[0006]
When forging with this forging device 110, the intermediate molded product W <b> 2 previously molded by forging is supported by the support 151 and disposed coaxially between the knockout pin 135 and the punch 116. Subsequently, the movable die 111 is advanced to bring the intermediate molded product W2 into contact with the knockout pin 135 and the punch 116, and the dynamic die 111 is further advanced to relatively retract the punch 116 into the dynamic die 111. . Then, at the same time that the intermediate molded product W2 comes into contact with the dynamic carved space 114 of the dynamic mold 111, the support 151 opens and retracts the intermediate molded product W2. At this point, between the knockout pin 135 and the dynamic mold 111, The intermediate molded product W2 is supported. Here, the knockout pin 135 is generally arranged in a free state in the front-rear direction. However, since the forging device 110 includes a resistance material 139 that gives the knockout pin 135 sliding resistance in the front-rear direction, The intermediate molded product W2 can be supported between the mold 111 and the mold 111. From this state, the moving die 111 further advances, and the intermediate molded product W2 is inserted into the static mold space 133 and the knockout pin 135 is retracted. Then, as shown in FIG. 6, the knockout pin 135 comes into contact with the backup pin 137 and stops, and at the same time, the intermediate molded product W2 is formed by forging to complete the molding of the forged product W3. Finally, the moving die 111 retreats and the knockout pin 135 advances to take out the forged product W3 from the static die 131.
[0007]
Therefore, since the intermediate molded product W2 is supported between the knockout pin 135 and the moving mold 111, it can be put into the mold regardless of the shape of the intermediate molded product W2. However, in the forging device 110, since the resistance material 139 that gives sliding resistance to the knockout pin 135 is separately provided on the side surface with respect to the knockout pin 135, the structure of the stationary die 131 may be complicated. In addition, it may be difficult to adjust the resistance material 139 by changing the forged product W3.
[0008]
Accordingly, an object of the present invention is to solve the above-described problems, and to provide a forging device that is less affected by the shape of a metal material and that has a simple device structure.
[0009]
[Means for Solving the Problems]
The configuration of the present invention is as follows.
[0010]
In a forging device comprising a stationary mold and a moving mold that can be advanced and retracted relative to the stationary mold, and a rod-shaped knockout pin is slidably fitted back and forth in the stationary mold or the moving mold, A coil spring having an inner diameter smaller than the outer diameter of the knockout pin in a natural state is mounted on the outer periphery so as to be relatively restricted with respect to sliding of the knockout pin in the axial direction .
[0011]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0012]
The process of forging a ball stud for a ball joint using the forging device of the present invention will be described. As shown in FIG. 1, the ball stud is formed in advance from a cylindrical material W0 ((A) in FIG. 1) from a preform W1 ((B) in FIG. 1) provided with a handle 4, and then the handle 4 An intermediate molded product W2 (Fig. 1 (c)) provided with a spare ball head 5 with the end on the opposite side is formed. The forging apparatus of the present invention is used in the step of forging the intermediate formed product W2 into a forged product W3 ((D) in FIG. 1).
[0013]
First, the structure of the forging device 10 will be described with reference to FIG.
[0014]
In the drawing, reference numeral 31 denotes a static die, which has a static engraving space 33 into which an intermediate molded product W2 is put in a front portion, and a knockout hole 34 into which a knockout pin 35 is continuously inserted is formed in the static engraving space 33. Further, a regulation space 38 having a diameter larger than that of the knockout hole 34 and a backup hole 36 having a diameter larger than that of the regulation space 38 are continuously formed. As shown in FIG. 4, a coil spring 39 having an inner diameter d that is smaller than the outer diameter D of the knockout pin 35 is expanded in the restriction space 38 and attached to the outer periphery of the knockout pin 35. Then, as shown in FIG. 2, a regulation screw 40 into which the knockout pin 35 is inserted into the inner periphery from the backup hole 36 side into the regulation space 38 so as to be relatively regulated against the sliding of the knockout pin 35. Screwed together. A backup pin 37 is inserted into the backup hole 36 so as to be able to advance and retreat.
[0015]
Subsequently, 11 is a moving mold, which has a moving engraving space 14 opposite to the static engraving space 33 of the stationary mold 31, and a punch hole 15 into which the punch 16 is continuously inserted into the moving engraving space 14. Further, a spacer space 17 having a diameter larger than that of the punch hole 15 is continuously formed. In the spacer space 17, a first spacer 18 having a protrusion 18 a that contacts the large-diameter portion 16 a of the punch 16 and protrudes on the side opposite to the punch, and a second spacer 19 that faces the protrusion 18 a of the first spacer 18, A spring 20 interposed between the first spacer 18 and the second spacer 19 is disposed. Further, the moving mold 11 includes a tightening ring 13 on the outer periphery thereof.
[0016]
A support 51 for supplying the intermediate molded product W <b> 2 is disposed between the stationary mold 31 and the moving mold 11. The support tool 51 includes a holding portion 52 that holds the intermediate molded product W2.
[0017]
Next, a process of forming the intermediate molded product W2 into the forged product W3 by the forging device 10 will be described.
[0018]
First, the forging device 10 is in a state in which the punch 16 of the dynamic die 11 is urged by the spring 20 in advance and protrudes from the dynamic engraving space 14. Further, the knockout pin 35 of the static die 31 is also in a state of protruding from the static engraving space 33 because only the backup pin 37 is retracted in the state in which the forged product W3 is taken out by the previous forging. Here, the knockout pin 35 is held by a coil spring 39 having a large clamping force with respect to its axis, and further has a sliding resistance in the axial direction larger than the spring force of the punch 16. In this state, the intermediate molded product W <b> 2 sandwiched by the sandwiching portion 52 of the support tool 51 is transported and disposed coaxially between the knockout pin 35 and the punch 16. Subsequently, the moving mold 11 is moved forward to bring the intermediate molded product W2 into contact with the knockout pin 35 and the punch 16, and the moving mold 11 is further moved forward to relatively retract the punch 16 into the moving mold 11. . Then, at the same time as the intermediate molded product W2 comes into contact with the dynamic engraving space 14 of the dynamic mold 11, the support 51 opens and retracts the intermediate molded product W2, and at this point, between the knockout pin 35 and the dynamic mold 11 The intermediate molded product W2 is supported. From this state, the movable die 11 further advances, and the intermediate molded product W2 is inserted into the static carving space 33 and the knockout pin 35 is retracted. Then, as shown in FIG. 3, the knockout pin 35 comes into contact with the backup pin 37 and stops. Finally, the moving die 11 is retracted and the knockout pin 35 is advanced to take out the forged product W3 from the static die 31.
[0019]
Since the intermediate molded product W2 is supported between the knockout pin 35 and the moving mold 11, the intermediate molded product W2 can be put into the mold regardless of the shape of the intermediate molded product W2. Further , the sliding resistance in the axial direction can be given to the knockout pin 35 only by arranging the coil spring 39 in the restriction space 38 formed continuously with the knockout hole 34 and screwing the restriction screw 40. Furthermore, the sliding resistance in the axial direction can be changed only by changing the type of the coil spring 39.
[0020]
Desirably, center punches are provided on the tip surfaces of the punch 16 and the knockout pin 35, and center recesses are provided on both end surfaces of the intermediate molded product W2.
[0021]
【The invention's effect】
As described above, according to the present invention, a stationary mold and a moving mold that can move forward and backward with respect to the stationary mold are provided, and a rod-shaped knockout pin is inserted into the stationary mold or the moving mold so as to be slidable back and forth. In the forging device to be fitted, a coil spring having an inner diameter that is smaller than the outer diameter of the knockout pin in the natural state on the outer periphery of the knockout pin is relatively regulated with respect to sliding of the knockout pin in the axial direction. Since the intermediate molded product is mounted, the intermediate molded product is supported between the knockout pin and the moving mold, so that it can be put into the mold regardless of the shape of the intermediate molded product. In addition, since the knockout pin can be given sliding resistance in the axial direction only by screwing the restriction screw by arranging a coil spring in the restriction space continuously formed in the knockout hole, the structure of the forging device can be improved. Easy to do. Furthermore, since the sliding resistance in the axial direction can be changed only by changing the type of the coil spring , the sliding resistance in the axial direction can be easily adjusted.
[Brief description of the drawings]
FIG. 1 is a process explanatory view showing a forming process of a forged product formed by forging using a forging device according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional plan view showing a state before molding for supplying an intermediate molded product to a forging device according to an embodiment of the present invention.
FIG. 3 is a partial cross-sectional plan view showing a state in which forging is performed by a forging device according to an embodiment of the present invention.
FIG. 4 is a partial cross-sectional plan view showing a coil spring and a knockout pin in a natural state.
FIG. 5 is a partial cross-sectional plan view showing a state before molding in which an intermediate molded product is supplied to a conventional forging device.
FIG. 6 is a partial cross-sectional plan view showing a state in which forging is performed by a conventional forging device.
[Explanation of symbols]
11 Moving mold 31 Static mold 35 Knockout pin 39 Coil spring D Outer diameter d Inner diameter

Claims (1)

A static mold (31) and a movable mold (11) capable of moving back and forth with respect to the static mold (31), and a rod-shaped knockout pin on the static mold (31) or the movable mold (11) In the forging device in which (35) is slidably inserted back and forth, the outer periphery of the knockout pin (35) has an inner diameter (d) that is smaller than the outer diameter (D) of the knockout pin (35) in the natural state. A forging device comprising a coil spring (39) mounted in a state where the coil spring (39) is relatively restricted against sliding in the axial direction of the knockout pin (35).

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