JP4319652B2 - Transfer feeder in forging press - Google Patents

Description

The present invention relates to a transfer feeder in a forging press. The transfer feeder is a multi-process die that is operated by three-dimensional motion of clamp, lift, advance, down, unclamp and return, one feed bar provided before and after the multi-step die in the press. It is a device that conveys materials (forged products) between them. Conveying claws are provided at corresponding positions on the opposing surfaces of the pair of front and rear feed bars of the transfer feeder. When the pair of front and rear feed bars approach, that is, when they are clamped, the opposing conveying claws Can support the workpiece firmly.
The present invention relates to a transfer feeder in a forging press equipped with a feed bar.

    In a transfer feeder of a forging press, when a pair of front and back feed bars approach each other, each feed bar has a feed claw on the other feed to securely hold the product between a pair of opposite feed claws. There is provided an urging means such as a spring that presses against the conveying claws provided on the bar, in other words, presses the respective conveying claws against the workpiece.

  However, in the pair of conveyance claws, if the urging force of the urging means that presses each conveyance claw against the workpiece is always the same magnitude, when the workpiece is unclamped, the workpiece is positioned between the pair of front and rear feed bars, In other words, it can be placed in the center of the mold in the next process, but if scale or mold lubricant adheres to or enters the biasing means, the scale becomes the operating resistance of the biasing means, The balance of the urging force of the urging means is lost. Then, the position of the workpiece placed on the mold is shifted to either the front side or the rear side, and the workability of the workpiece in forging deteriorates. If the workability of the work is deteriorated, the shape of the forged work is changed, and the work cannot be clamped well by the conveying claws, which causes a misfeed.

As a technique for solving such a problem, the following technique has been developed (conventional example 1: Patent Document 1).
As shown in FIG. 4, the technology of Conventional Example 1 is a transfer bar that is mounted on an automatic forging press, moves the front and rear transfer bars 101A and 101B three-dimensionally, grabs the workpiece, lifts it, and transports it to the next process position. This is a technology related to the workpiece gripping device, which converts the rotation of the pair of eccentric cams 102A and 102B into the forward and backward movements of the two forward and backward transfer bars 101A and 101B, and always pushes the transfer bars 101A and 101B inward from both sides. The urge sources 104A and 104B are configured such that the travel limit to the inside of one transfer bar 101B is smaller than the travel limit to the inside of the other transfer bar 101A, in other words, to the inside of the transfer bar 101B. Stops moving faster than the inside of the transfer bar 101A and the outside of the transfer bar 101B moves to the outside of the transfer bar 101A. It is adjusted to start moving later than moving outward. A spring 116 that biases the gripper 112A is provided only on the other transfer bar 101A.
For this reason, when the workpiece is released, first, only the other transfer bar 101A moves outward while the movement of one transfer bar 101B is stopped. At this time, since the gripper 112A of the other transfer bar 101A is urged toward the gripper 112B of the transfer bar 101B by the spring 116, the work is held while being positioned by the gripper 112B. With the movement of the other transfer bar 101A to the outside, the urging force by the spring 116 decreases, and after the urging force by the spring 116 disappears, the one transfer bar 101B starts moving. For this reason, the workpiece can be arranged in the mold with one end thereof arranged at the reference position, that is, the position K.

JP-A-6-71361

  However, when the workpiece is clamped by the transfer bars 101A and 101B, a reaction force is applied from the workpiece to the transfer bars 101A and 101B. When the reaction force is large, both of the transfer bars 101A and 101B are mutually connected. Deflection in the separating direction. However, since the transfer bar 101A is provided with the spring 116 that biases the gripper 112A, even if the spring 116 receives this reaction force and the transfer bar 101A bends, the bend is small. However, in the case of the transfer bar 101B, since the gripper 112B is fixed to the transfer bar 101B, the amount of bending due to the reaction force from the workpiece is larger than that of the transfer bar 101A. Then, when the work is placed on the mold in the next process, there is a possibility that the position of the work is shifted by the amount of difference between the deflection amounts of both transfer bars 101A and 101B.

  An object of this invention is to provide the transfer feeder in the forge press which can convey between dies in the state which positioned the workpiece | work correctly in view of the said situation.

A transfer feeder in a forging press according to a first aspect of the present invention includes a front feed bar disposed in front of a multi-step mold in the forging press, a rear feed bar disposed in the rear, and an operating device that operates the front and rear feed bars. A feeder, wherein the operating device operates a front feed bar operating device that operates the front feed bar, and a rear feed bar operating device that can operate the rear feed bar independently of the front feed bar. The rear feed bar actuating device is arranged behind the front feed bar actuating device and at a position spaced apart from the front feed bar actuating device, and the front and rear feed bars oppose each other. When the front and rear feed bars approach the surface, there are front and rear transport claws that support the workpiece by sandwiching it from the front and rear. Of the front and rear transport claws, the rear transport claws are fixed to the rear feed bar, and the front transport claws can move forward and backward toward the front feed bar toward the rear transport claws. Urging means for urging the front conveying claw toward the rear feed bar is provided, and the rear feed bar has higher rigidity than the front feed bar. It is formed.
The transfer feeder in the forging press according to the second invention is the transfer feeder according to the first invention, wherein the thickness of the rear feed bar in the lift direction is equal to the thickness of the front feed bar in the lift direction. The width in the direction of approaching and separating is longer than the width of the front feed bar in the direction of approaching and separating from the rear feed bar.
The transfer feeder in the forging press of the third invention is characterized in that, in the first invention, the rear feed bar is formed of a material having a Young's modulus larger than that of the material of the front feed bar.
The transfer feeder in the forging press of the fourth invention is characterized in that, in the first invention, the length of the rear feed bar in the axial direction is shorter than the length of the front feed bar in the axial direction.

According to the first invention, by making the rigidity of the rear feed bar higher than that of the front feed bar, even if the workpiece is clamped with a clamping force that causes the front and rear feed bars to bend, the front and rear feed bars are bent. Since it is possible to prevent the displacement of the resulting workpiece, the workpiece positioning accuracy can be increased.
According to the second invention, since only the rigidity in the direction in which the reaction force is applied when the workpiece is clamped can be increased in the subsequent feed bar, adverse effects such as an increase in weight due to the increased rigidity of the rear feed bar are suppressed. be able to.
According to the third invention, since it is not necessary to change the dimensions of the rear feed bar, it can be easily applied even to a currently used apparatus.
According to the fourth aspect of the invention, the rigidity of the rear feed bar can be increased. In particular, if the length of the rear feed bar is made shorter than the length of the normal feed bar, the apparatus can be made compact. .

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a transfer feeder according to the present invention. In FIG. 1, reference numeral C indicates four press columns, reference numeral 1 indicates a front feed bar, and reference numeral 2 indicates a rear feed bar. As shown in FIG. 1, conveying claws 1 a and 2 a for gripping materials are attached to the surfaces of the feed bars 1 and 2 facing each other in the number corresponding to the number of dies in the multi-step mold. Of the conveying claws 1 a and 2 a, the rear conveying claw 2 a provided on the rear feed bar 2 is fixed to the rear feed bar 2. On the other hand, the front conveyance claw 1a provided on the front feed bar 1 is provided so as to be able to advance and retreat toward the rear conveyance claw 2a, and by a biasing means (not shown) such as a spring or a cylinder, It is always biased toward the rear conveying claw 2a.
Further, as shown in FIG. 1, the rear feed bar 2 has a width W2, that is, a length in a direction in which the front and rear feed bars 1, 2 approach and separate from each other is longer than a width W1 of the front feed bar 1. The reason is described later.

As shown in FIG. 1, the front and rear feed bars 1, 2 are supported by a feed bar actuating device S so that the axial directions thereof are parallel to each other.
The feed bar actuating device S supports both ends of the front feed bar 1 and supports a pair of front feed bar actuating devices 10 and 10 controlled to operate in synchronization with each other and both ends of the rear feed bar 2. Are supported by a pair of rear feed bar actuating devices 20, 20 controlled to operate synchronously. And a pair of rear feed bar actuators 20 and 20 sandwich a line (hereinafter referred to as a workpiece conveyance line L) passing through the workpiece conveyance center in the forging press with respect to the pair of front feed bar actuators 10, It is arranged rearward (rightward in FIG. 1) and at a separated position, and is configured to be freely operable without being restricted by the movement of the front feed bar actuator 10. In other words, the front and rear feed bars 1 and 2 can be independently operated by the front and rear feed bar actuating devices 10 and 20.

  Further, as shown in FIG. 1, the front and rear feed bar actuating devices 10 and 20 have substantially the same configuration, and each has a base frame 11 fixed to the column C and a lifting frame with respect to the base frame 11. Elevating means for elevating and lowering 17, a clamp mechanism provided on the elevating frame 17 for moving the advance frame 41 toward and away from the other feed bar operating device, and an advance frame 41 for moving the feed bars 1 and 2 forward and backward. Advanced mechanism.

For this reason, if the clamping mechanism is operated in the front and rear feed bar actuating devices 10 and 20, the workpiece can be clamped by the front and rear feed bars 1 and 2, and the lifting means is operated while the workpiece is clamped. The workpiece can be moved up and down, and the workpiece can be advanced and retracted by operating the advance mechanism with the workpiece clamped. Moreover, since the rear feed bar 2 can be operated independently of the front feed bar 1, when the work is unclamped, the front feed bar 1 is first moved away from the work and attached. The rear feed bar 2 can be moved away from the workpiece after no biasing force is applied to the workpiece from the biasing means 1c. Then, the workpiece does not move when the front and rear feed bars 1 and 2 are separated from the workpiece, and the workpiece can be placed as it is at the position where the rear feed bar 2 is moved. Can be high.
The configuration of the front and rear feed bar operating devices 10 and 20 is not particularly limited as long as the front and rear feed bars 1 and 2 can be operated independently.

By the way, when the workpiece is clamped by the front and rear feed bars 1 and 2, a reaction force is applied from the workpiece to the front and rear feed bars 1 and 2, but the front feed bar 1 receives the reaction force via the biasing means. In contrast, the rear feed bar 2 receives the reaction force of the workpiece directly because the rear conveying claw 2a is fixed to the rear feed bar 2. When the clamping force for clamping the workpiece is strong, the reaction force from the workpiece is also strong, and the reaction force from this workpiece causes the front and back feed bars 1 and 2 to bend away from each other. 1 is subjected to a reaction force via the biasing means, whereas the rear feed bar 2 has the rear transport claw 2a fixed to the rear feed bar 2, so that the transport claw 1a and the transport claw 2a are Thus, a difference occurs in the distance from the press center. Specifically, the distance from the workpiece conveyance line L to the center of the press, that is, the workpiece conveyance line L to the rear conveyance claw 2a, is equal to the reaction force applied to the rear feed bar 2 from the urging means via the workpiece. It becomes larger than the distance to the nail | claw 1a for front conveyance. If the distance from the workpiece conveyance line L to both conveyance claws 1a and 2a is the same, the workpiece will not be displaced when the workpiece is placed on the mold in the next process. Since there is a difference in the distance to the conveying claws 1a and 2a, there is a possibility that the position of the workpiece is shifted from the center of the press, that is, the center of the mold, by the difference.
However, in the transfer feeder of the present invention, the rear feed bar 2 is formed so that the width W2 of the rear feed bar 2 is longer than the width W1 of the front feed bar 1. The rigidity with respect to the bending in the direction in which 2 approaches and separates from each other is higher than that of the front feed bar 1. Then, when the workpiece is clamped with the rigidity of the rear feed bar 2 such that the front and rear feed bars 1 and 2 are bent, the amount of deflection of the rear feed bar 2 itself due to the reaction force from the workpiece is the front feed bar 1. If the adjustment is made to be smaller than the amount of bending of the workpiece, it is possible to prevent the displacement of the workpiece due to the bending of the front and rear feed bars 1 and 2. Accordingly, near net shaping or the like can stabilize the conveyance of a product having a small gap between the workpiece and the mold, and can reduce the calling provided in the mold for loading the workpiece. And since the accuracy of carrying into the trim mold can also be improved, it is possible to prevent the occurrence of defective products due to the displacement of the workpiece on the trim mold, and to improve the product accuracy after trimming. it can.

  Furthermore, the rear feed bar 2 may have not only the width W2 but also the thickness in the lift direction (direction perpendicular to the paper surface in FIG. 1) larger than the thickness of the front feed bar 1 in the lift direction. If the thickness in the direction is the same as that of the front feed bar 1, the rear feed bar 2 can only increase the rigidity in the direction in which the reaction force is applied when the workpiece is clamped. Thus, adverse effects such as an increase in the weight of 2 can be suppressed.

Furthermore, the rear feed bar 2 has a high rigidity against bending in the direction in which the front and rear feed bars 1 and 2 approach and separate from each other, and the amount of bending when the workpiece is clamped with such a force that the front and rear feed bars 1 and 2 are bent. May be adjusted so as to be smaller than the amount of deflection of the front feed bar 1, and any method can be used as long as the front and rear feed bars 1 and 2 can increase the rigidity against bending in the direction of approaching and separating from each other. May be. For example, as shown in FIG. 2, the rear feed bar 2 may be formed of a material having a higher Young's modulus than the material of the front feed bar 1. In this case, even if the width of the rear feed bar 2 and the thickness in the lift direction are the same as the front feed bar 1, that is, the same as that of the conventional rear feed bar, the amount of deflection due to the reaction force from the workpiece can be reduced. Therefore, it can be easily applied to a press apparatus currently used.
Further, as shown in FIG. 3, if the length of the rear feed bar 2 in the axial direction is made shorter than the length of the front feed bar 1, the cross-sectional shape and material of the rear feed bar 2 are exactly the same as those of the front feed bar 1. Even if it exists, the rigidity with respect to the bending of the back feed bar 2 can be made high. Here, as a method of making the length of the rear feed bar 2 in the axial direction shorter than the length of the front feed bar 1, (1) making the length of the front feed bar 1 longer than usual, (2) the rear feed bar There is a method in which the length on the two sides is made shorter than usual, but any of them can be adopted. In particular, in the case of (2), the length of the device on the rear feed bar 2 side can be shortened, so that the device can be made compact.

It is a top view of the transfer feeder of the present invention. It is a top view of the transfer feeder of other embodiments. It is a top view of the transfer feeder of other embodiments. It is a side view of the conventional transfer feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front feed bar 1a Front conveyance claw 2 Rear feed bar 2a Rear conveyance claw 10 Front feed bar actuator 20 Rear feed bar actuator S Feed bar actuator

Claims (4)

A transfer feeder provided with a front feed bar arranged in front of a multi-step mold in a forging press and a rear feed bar arranged behind, and an operating device for operating the front and rear feed bars,
The actuating device is
A front feed bar actuating device for actuating the front feed bar;
A rear feed bar actuating device capable of independently operating the rear feed bar with respect to the front feed bar;
The rear feed bar actuating device is located behind the front feed bar actuating device and spaced from the front feed bar actuating device;
Front and rear conveying claws that support the workpiece by sandwiching the workpiece from the front and rear when the front and rear feed bars approach each other are provided on opposite surfaces of the front and rear feed bars,
Of the front and rear transport claws, a rear transport claw is fixed to the rear feed bar, and a front transport claw is attached to the front feed bar so as to be able to advance and retreat toward the rear transport claw.
An urging means for urging the front conveying claw toward the rear feed bar is provided,
The rear feed bar is
A transfer feeder in a forging press, wherein the transfer feeder is formed to have higher rigidity than the front feed bar. The rear feed bar is
The thickness in the lift direction is equivalent to the thickness in the lift direction of the front feed bar,
The width in the direction approaching and separating from the front feed bar is formed to be longer than the width of the front feed bar in the direction approaching and separating from the rear feed bar. A transfer feeder in the forging press according to 1. The rear feed bar is
2. The transfer feeder in a forging press according to claim 1, wherein the transfer feeder is formed of a material having a Young's modulus larger than that of the material of the front feed bar. The transfer feeder in the forging press according to claim 1, wherein the length of the rear feed bar in the axial direction is shorter than the length of the front feed bar in the axial direction.

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