JP3193466B2 - Forging method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging device.

[0002]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open No. 1-132533, a forging method includes a die forging material in which a portion having a large amount of burrs and a portion having a small amount of burrs are located adjacent to each other. When mold forging is performed on fins, it restricts the flow of burrs from the part with a large amount of burrs to the part with a small amount of burrs, thereby preventing collisions between the burrs and causing the product part to lean too much. What has prevented is known. By the way, when the forging process is completed, the forged product is generally extruded from the forging die, and then the gripping device after being carried out approaches from both sides of the forged product so as to be at a predetermined position with respect to the forged product (entering the forged product). ), The forged product is carried out by grasping the burrs on both sides of the forged product.

[0003]

However, the extension (formation) of the burrs from the forged product is not uniform, and when the bur extends far beyond the gripping position with respect to the gripping device, the burrs extend. The part will regulate the approaching movement of the gripping device in the unloading means trying to enter the predetermined position,
The gripping device may be damaged. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a flashing portion of a forged product from damaging a gripping device in a carry-out unit when the forged product is carried out.

[0004]

In order to achieve the above object, according to the present invention, there is provided a forging method comprising a pair of forging dies each having a burred portion which is gripped by a carrying-out means capable of moving toward and away from a forged product. In a forging device for forming an article, a slider is provided in one of the pair of forging dies, in a region where the burrs extend, so that a slider can be displaced and moved in the extending direction of the burrs. An urging means for urging the slider in the direction in which the burrs extend is interposed between the one forging die and the other forging die of the pair of forging dies. Slider position adjusting means for contacting the slider and retracting the slider into the mold to a predetermined position is provided, and the inner end surface of the slider is directed toward the inside of the one forging die as it faces the other forging die. As a curved configuration That. With the above configuration, the burrs are
The formation of the gripping device far beyond the gripping device is restricted, and the burrs do not restrict the movement of the gripping device that attempts to enter the predetermined position. Therefore, when the forged product is carried out, it is possible to prevent the burrs of the forged product from damaging the holding device in the carrying-out means. In addition, when the forged product is extruded, the inner end surface of the slider is reliably prevented from being located in the moving region of the forged product. Therefore, the interference between the forged product and the slider can be eliminated, and the forged product can be reliably extruded from the forging die.

[0005]

[0006]

[0007]

Embodiments of the present invention will be described below. First, the forging method according to the present invention will be described. The forging method according to the present invention is premised on obtaining a forged product having a burred portion gripped by the carrying-out means when carrying out the forged product. This is because the object of the present invention is to prevent the carrying-out means (gripping device) from being damaged by the burrs. The forging is performed as usual.
This is performed by processing the forging material using upper and lower dies.

In the present invention, forging is performed under the above-described forging method while restricting the burrs so as not to extend beyond a predetermined length. This is because, when the forged product is carried out, the burrs abut on the gripping device of the carrying-out means before reaching a predetermined entry position, so that the movement of the gripping device is not restricted.
Specifically, the “restriction” of the extension of the burrs is performed by providing a restriction member on one of the upper and lower dies and causing the restriction surface of the restriction member to face the extension region of the burrs. in this case,
More preferably, it is preferable to secure a clearance space on the inner side of the mold with respect to the regulation surface in order to eliminate the influence on the forged product accompanying the regulation. The above-mentioned "predetermined length" is defined as a direction in which the direction of movement of the gripping device in the unloading means is the same as the direction in which the gripping device advances and retreats, and in which direction, the approaching movement of the gripping device to a predetermined approach position is not restricted. It can be obtained by adjusting the position of the aforementioned regulating surface.

Therefore, in the above-mentioned forging method, when the forging is completed, the forged product is punched out from the lower die by a knockout pin or the like, and the gripping device of the unloading means enters the forged product from both sides of the forged product. However, at this time, since the burrs are formed so as not to extend beyond a predetermined length, the burrs do not restrict the inward movement of the gripping device, and the gripping device is To the entry position, grasp the burrs, and carry out the forged product. For this reason,
In the above method, the carrying-out means is not damaged by the burrs at the time of carrying out the forged product.

Next, a specific apparatus for carrying out the above-described forging method will be described with reference to FIGS. 1 to 3, reference numeral 1 denotes a lower die as one forging die, 2 denotes an upper die as the other forging die, and in this embodiment, an upper die 2
Can be moved up and down with respect to the lower mold 1.

The upper and lower dies 2, 1 form a cavity 3 when the dies are closed, as shown in FIG. The cavity 3 has an engraved part 4, a flash land part 5, and a gutter part 6, and when the upper and lower dies 2, 1 are forged, the forged product 7 extends to the gutter part 6. The burrs 8 are to be formed.

A slider 9 is provided on the upper surface of the lower mold 1 as shown in FIGS. The slider 9 is disposed in an extension area of the burr 8.
Is held by the lower mold 1 by a pair of guide members 10 so as to be slidable in the direction in which the burrs 8 extend (the left-right direction in FIG. 2).

A through hole 11 is formed in the slider 9, and a stopper 12 is provided on the upper surface of the lower die 1 to enter the through hole 11. The through hole 11
Is formed on the inner end side of the slider 9 so as to penetrate the slider 9 in the up-down direction.
As shown in FIG. 1, it has a constant width and extends relatively long in a direction perpendicular to the sliding direction of the slider 9. As shown in FIG. 1, the stopper 12 extends in the direction in which the through hole 11 extends so as to correspond to the through hole 11, and has a width smaller than that of the through hole 11. Numeral 9 is slidable in the sliding direction of the slider 9 by the gap between the stopper 12 and the inner surface of the through hole 11 in FIG. And the through hole 1
In FIG. 1, when the left inner surface comes into contact with the stopper 12, as shown in FIG. 2, the slider 9 is set so that its inner end surface faces the gutter portion 6,
When the right inner surface of the through hole 11 in FIG. 1 contacts the stopper 12, the slider 9 is installed such that the tip of the slider 9 projects from the lower mold 1 as shown in FIG.

As shown in FIGS. 1 to 3, the slider 9 has a plurality of spring accommodating grooves 13.
A coil spring 14 is housed in each spring housing groove 13. The plurality of spring accommodating grooves 13 are arranged in a direction orthogonal to the sliding direction of the slider 9.
The groove opening extends from the back surface of the slider 9 to the lower die 1 and extends in the sliding direction of the slider 9. One end (the left end in FIG. 1) of each spring accommodating groove 13 is stopped inside the slider 9, while the other end is opened from the slider 9 so as to face the stopper 12. One end (the left end in FIG. 2) of each of the coil springs 14 is in contact with a closed end of one end of each of the spring accommodating grooves 13, and the other end of each of the coil springs 14 (in FIG. 2,
The right end is in contact with the stopper 12. For this reason, the slider 9 is biased by the coil spring 14 in a direction protruding from the side surface of the lower die 1.

The upper die 2 is provided with a cam member 15 as a slider position adjusting means, as shown in FIGS. The cam member 15 has a lower end portion extending below the upper mold 2, and an inner surface thereof is formed as a cam surface 15 a that is inclined inward toward the upper mold 2 as going upward. The slider 9 is positioned so as to face a region above the tip end of the slider 9. In this embodiment, in order to make the contact between the cam surface 15a and the front end of the slider 9 smooth, the front end of the slider 9 is provided with an inclined surface 9a which is inclined so as to be separated from the lower die 1 as it goes downward. Are formed.

As shown in FIG. 2, an inner end surface (right end surface in FIG. 2) of the slider 9 is a regulating surface 16 for regulating the extension of the burrs 8. In the present embodiment, the regulating surface 16 is curved so as to face upward and inward of the lower mold 1. As shown in FIG. Is used as an escape space, and is connected to the inner surface of the gutter portion 6. In this embodiment, in order to ensure that the extending end of the flash portion 8 guides to the regulating surface 16, the guide surface 1 continuous with the regulating surface 16 when the mold is closed on the upper surface of the lower mold 1.
7 are formed.

Therefore, in the above-described apparatus, during forging, as shown in FIG.
As a result, the extended end of the flash 8 is turned back, and escapes to the gutter 6. Next, after forging, the upper mold 2
4 is lifted as shown in FIG. 4, the contact between the cam member 15 and the slider 9 is released, and the slider 9 moves in a direction to protrude from the lower mold 1.
As a result, the regulating surface 16 is no longer present in the upper region of the burrs 8, and the forged product 7 does not interfere with the burrs 8 as shown in the phantom line in FIG. It is extruded from the lower mold 1 by a knockout pin.

Thereafter, the holding device 18 in the carrying-out means
However, as shown by the imaginary line in FIG. 4, similar to the forging method described above, since the burrs 8 are regulated by the regulating surface 16 so as not to extend beyond a predetermined length, the gripping is performed. The device 18 is not damaged by the burrs 8 during the approach movement.

[0019]

As described above, in the present invention,
When the forged product is carried out, it is possible to prevent the burrs of the forged product from damaging the gripping device in the carrying-out means. Further, in the present invention, the forged product can be reliably extruded from the forging die.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lower mold according to the present embodiment (B-
B sectional view).

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line CC of FIG. 1;

FIG. 4 is an operation state diagram from FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower die 2 Upper die 6 Gutter part 7 Forged product 8 Burr part 9 Slider 15 Cam member 16 Restriction surface 18 Gripping device

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00

Claims (1)

(57) [Claims] 1. A forging apparatus for forming a forged product having a flash portion in which a pair of forging dies is gripped by carrying-out means capable of moving toward and away from the forged product, wherein one of the pair of forging dies is provided. In the forging die, a slider is provided in the extension region of the flash portion so as to be displaceable in the direction in which the flash portion extends, and the slider is extended between the slider and the one forging die. A biasing means for biasing in the ejection direction is interposed, and a slider for abutting on the other forging die of the pair of forging dies when the die is closed to pull the slider inward to a predetermined position. Positioning means is provided, and an inner end surface of the slider is curved so as to face inward of the one forging die as it faces the other forging die.