JPH0242356Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is suitable for use in horizontal forging dies, especially when finish forging a workpiece that has been pre-formed in cooperation with a laterally oriented punch and die. This invention relates to a forging die that forges a workpiece transported by a gripper to a predetermined position between a die and a punch while being properly held between the punch and die-side parts.

(Prior Art) As a conventionally known horizontal forging type punch structure of this type that is arranged laterally, there is one shown in cross-sectional view in FIG. 3, for example.

This punch structure fixes a substantially cylindrical holder 2 to the main ram 1, fixes a punch 3 stored at the tip of this holder 2 there, and also penetrates the punch 3 and moves forward and backward with respect to it. The pin 4 is biased in its advancing direction via a push rod 7 by a spring 6 in a spacer 5 disposed between the main ram 1 and the punch 3 in the holder 2.

As shown in FIG. 4, finish forging of a workpiece using a punch structure having such a configuration involves gripping a preformed workpiece 9 in its diametrical direction by, for example, four gripping claws 8a of the gripper 8. , by transporting it in a direction perpendicular to the plane of the paper and positioning it at a predetermined position between the punch 3 and the die 10, and then by bringing the pin 4 into contact with the workpiece 9 based on the forward movement of the main ram 1, The workpiece 9 is held between the pin 4 and the support pin 12 provided on the die structure 11 and urged in the advance direction, and then the gripping claws 8a of the gripper 8 are separated from the workpiece 9, and the main ram 1 In other words, the punch 3 is moved forward relative to the pin 4 and the punch 3 collides with the die 10 via the work 9.

(Problem to be solved by the invention) However, in such conventional technology, pin 4
is protruded from the pin 4 at a position that does not affect the finish forging by the punch 3, and the diameter of the pin 4 had to be relatively small. Therefore, the preformed workpiece 9 is As shown, in both cases where the hole diameter d is smaller than the hole diameter D after removing the center burr, and when the product shape after finishing forging is such a shape, the workpiece is work 9 cannot be held, and even if it is possible to hold work 9,
In addition to the problem that it was not possible to perform the required finish forging on the pins 4 and 1, this conventional technology
Since the punch 3 collides with the workpiece 9 held between the rams 2 and 2 at a speed equal to the operating speed of the main ram 1, there is a problem in that the punch 3 is severely damaged.

(Means for solving the problem) This invention performs forging processing on the workpiece while the support of the workpiece conveyed by the gripper is taken over by holding the workpiece between the punch and the die side part. In the horizontal forging die, the punch, which is attached to the main ram via the holder, is attached to the outer cylindrical part fixed to the holder, and inside this outer cylindrical part.
a central portion that is disposed so as to be slidable in the axial direction and has a part of the workpiece molding surface; an elastic means for causing this central portion to protrude from the outer cylindrical portion is disposed within the holder; A stopper is provided on the outer cylinder portion to specify the retracting limit position with respect to the outer cylinder portion, and a die that cooperates with the punch is disposed on the outside of the die side part.

(Function) According to this horizontal forging die, by operating the main ram, the center portion of the punch, which is pressed by the elastic means and protrudes from the outer cylinder portion of the punch, is conveyed to a predetermined position by the gripper. By directly contacting the preformed workpiece with the workpiece forming surface part in the center, the workpiece will be sandwiched between it and the punch side part. Regardless of the shape, this is always done properly, and the clamping does not interfere with the finish forging of the workpiece at all. In addition, since such clamping is performed at the punch center portion, which has a much smaller diameter than the punch outer cylinder portion,
Interference between the gripper that grips the workpiece from the diametrical direction and the center portion of the punch is extremely effectively prevented. Note that this becomes more reliable when a phase difference is provided in the circumferential direction of the workpiece between the abutting part of the center portion of the punch and the abutting part of the gripper gripping claws on the workpiece. In addition, the center of the punch is pressed against the workpiece in advance, and the pressing force gradually increases as the main ram moves forward at the start of finish forging, thereby starting plastic deformation of the workpiece. Therefore, the impact load acting on the punch is effectively reduced.

(Example) This invention will be explained below based on illustrated examples.

FIG. 1 is a sectional view showing an embodiment of this invention with the central part of the punch in a retracted position. , 33 indicate punches disposed at the inner tip of the holder 22, respectively.

Here, this punch 33 includes an outer cylinder portion 33a fixed to the holder 22, and an outer cylinder portion 33a fixed to the holder 22.
a and a central portion 33b disposed on the inside of a so as to be slidable in the axial direction thereof.
The protrusion limit position with respect to the outer cylinder part 33a is specified by using the flange member 33e bolted to the rear end of the center part 33b and the diameter-reduced shoulder part 3 of the outer cylinder part 33a.
The rear end surface 33g of the engaging portion of the center portion 33b fits radially outward into the outer cylinder portion 33a, and the rear end surface 33g of the engaging portion fits into the outer cylinder portion 33a radially outward.
This is performed by contacting the cutout end surface 33h of the outer cylinder portion 33a.

Further, as shown in FIG. 1a, the engaging portions 33i of the center portion 33b that fit radially outward into the outer cylinder portion 33a are provided at four diametrically opposed locations, and each engaging portion 33i is provided at four diametrically opposed locations. A curved surface d forming a part of the molding surface 33c is provided at the tip of the section, and each of these curved surfaces 33d
can be aligned with other formed portions of the molding surface 33c in the retracted position of the center portion 33b as shown in FIG. 1b. Here, the forming surface 33c provided at the tip of the punch 33 has a shape corresponding to the desired finished shape of the workpiece, which is a curved concave shape as shown in the figure.

The outer cylinder portion 33a of the punch 33 is arranged in a holder and the outer cylinder portion 33a of the punch 33 is
By interposing the spacer 24 between the punch 3a and the main ram 21, the punch 3 of the prior art is Similarly, it is fixed to the tip of the holder 22. In addition, the outer cylinder part 3
The center portion 33b housed in the spacer 24
By receiving the spring force of a coil spring 25, which is an example of elastic means, disposed inside the body via the push rod 26, the outer cylinder portion 33
For a, the flange member 33e and the reduced diameter shoulder 33f
is maintained at the protrusion limit position where the two are in contact with each other. Therefore, here, when the force acting on the curved surface 33d of the center portion 33b overcomes the spring force of the coil spring 25, the outer cylinder portion 33 of the center portion 33d
This will result in a backward displacement for a,
This backward displacement is prevented when the joint rear end surface 33g of the center portion 33b comes into contact with the notch end surface 33h of the outer cylinder portion 33a, or in other words, when the curved surface 33d aligns with the other portion of the molding surface 33c. That will happen.

The operation of the punch 33 attached to the main ram 21 via the holder 22 as described above will be explained based on FIG. 2.

In the figure, 41 indicates a die structure, and this die structure 41
is a cylindrical member 42, a die 43 fixed in the cylindrical member, and penetrates through the center of the die,
It is provided with a support pin 44 which is arranged to be movable forward and backward with respect to the support pin 44 and is biased in the advancing direction with respect to the support pin 44 .

When finish forging the workpiece 45 that has been pre-formed, first the workpiece 45 held by the gripping claws 46a of the gripper 46 is transported and positioned to a predetermined position, and then the main ram 21
By moving the coil spring 2 forward, each curved surface 33d of the center portion 33b existing at the protrusion limit position is made to circumscribe the workpiece 45, and the coil spring 2
5, the workpiece 45 is appropriately and reliably held between the curved surface 33d of the center portion 33b and the tip of the support pin 44, and then the gripping claw 46a of the gripper 46 is Free from 45.

After the workpiece 45 is released, the continued forward movement of the main ram 21 causes the outer cylinder portion 33a to move forward with respect to the center portion 33b.
In other words, the outer cylinder portion 33 of the center portion 33b
After the center portion 33b reaches the retracting limit position as shown in FIG. 45 is started, and this plastic deformation is continued until the main ram 21 reaches its extension limit position.

In this way, when the main ram 21 reaches its forward movement limit position, the main ram 21
One cycle is completed by moving the mold to its retracting limit position and sending the product out of the mold by the advancing movement of the support pin 44 caused by the retracting movement.

According to such finish forging, the workpiece 45 is transferred from the gripper 46 to the forging die by being held between the center portion 33b, which has a much smaller diameter than the outer cylinder portion 33a, and the support pin 44. Interference between the punch 33 and the gripper gripping claws 46a during delivery is extremely effectively prevented. Moreover, since the center portion 33b that contributes to holding the workpiece 45 has a part of the forming surface 33c on its tip surface, the workpiece 45 can be placed at a desired location regardless of the shape of the workpiece. In addition, when the workpiece 45 is plastically deformed while maintaining the clamped state, the center portion 33b reliably functions as a part of the punch 33, so that the workpiece 45 can be held properly at all times. It is possible to carry out the desired forging process without any effects caused by the clamping.

Furthermore, here, the punch center portion 33b is pressed against the workpiece 45 under the action of the coil spring 25 prior to the start of plastic working of the workpiece 45, so that
The impact load acting on the punch 33 at the start of the plastic working is advantageously reduced, and damage to the punch 33 is effectively prevented.

Although the above explanation was based on the illustrated example of this invention,
The elastic means for biasing the central part of the punch in the protruding direction can be made of rubber, a rubber-like elastic body, an air spring, etc., and the shape of the molded surface of the punch and the shape of the outer peripheral surface of the tip can be changed as required. Can be changed.

(Effect of the invention) Thus, according to this invention, by pressing the workpiece, which has been conveyed to a predetermined position by the gripper, against the die-side part by the center portion of the punch, which has a part of the workpiece forming surface, The workpiece is always held properly between the punch center part, which has a much smaller diameter than the punch outer cylinder part, and the die side part, regardless of the shape of the workpiece, and without causing any interference between the gripper's gripping claws and the punch. In addition, by continuing to advance the punch while maintaining the workpiece in such a pinched state, the workpiece can be held without any effects caused by the workpiece being held.
Predetermined processing can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a sectional view showing the application state of the forging die, Fig. 3 is a sectional view showing a conventional example, and Fig. 4 is a forging shown in Fig. 3. FIG. 5 is a cross-sectional view showing the application state of the mold, and FIG. 5 is a cross-sectional view illustrating the workpiece. 21... Main ram, 22... Holder, 24
... Spacer, 25 ... Coil spring, 26
...Pushyrod, 33...Punch, 33a...
... Outer cylinder part, 33b ... Center part, 33c ... Molding surface, 33d ... Curved surface, 33e ... Flange member, 33f ... Diameter-reduced shoulder, 33g ... Rear end surface of engaging part, 33h ... Notch end surface, 33i...Interlocking part, 4
1...Die structure, 43...Die, 44...Support pin, 45...Work, 46...Gripper, 46
a...Gripping claw.

Claims (1)

[Claims for Utility Model Registration] Horizontal forging in which the workpiece 45 transported by the gripper 46 is supported by the punch 33 and the die-side portion 44 holding the workpiece while forging the workpiece. In the mold, a punch 33 attached to the main ram 21 via a holder 22 is arranged inside an outer cylinder part 33a fixed to the holder and slidably in the axial direction of the outer cylinder part to form a workpiece. surface 33
and a central portion 33b having a portion 33d of c, an elastic means 25 is disposed in the holder to make this central portion protrude from the outer cylinder portion, and the retracting limit position of the central portion with respect to the outer cylinder portion is set. A horizontal forging die in which a specifying stopper 33h is provided on the outer cylindrical portion, and a die 43 that cooperates with the punch 33 is disposed on the outside of the die side part 44.