JP4319651B2 - 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 rear feed bars approach each other, each feed bar has a feed claw on the other feed to ensure that the product is gripped between a pair of opposed 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. 2, 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 work is released, first, the movement of one transfer bar 101B is stopped and only the other transfer bar 101A moves outward. 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, so that the transfer bars 101A and 101B are both bent in a direction away from each other. In addition, since the force of the spring 116 that biases the gripper 112A is applied to the transfer bar 101B through the workpiece, the transfer bar 101B is bent by an amount corresponding to the force. For this reason, the center position of the workpiece is shifted from the line for conveying the workpiece by the amount of deflection corresponding to the force of the spring 116 that biases the gripper 112A out of the amount of deflection of the feed bar 101B. Then, when the work is placed on the mold in the next process, the position of the work is shifted by the amount of displacement of the center position of the work caused by the spring 116 in the transfer bar 101B and the line conveying the work. There is a possibility that.

  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, the 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 actuating device is arranged so that the front and rear feed bars approach each other. When the rear feed bar bends away from the front feed bar when the workpiece is supported by the conveying claws, the distance at which the rear feed bar approaches the front feed bar is When the rear feed bar is not bent, the rear feed bar is adjusted to be longer than the distance that the rear feed bar approaches the front feed bar by the amount of deflection of the rear feed bar. Characterized in that it is one that is.

  According to the first invention, even if the workpiece is clamped with a clamping force that causes the front and rear feed bars to bend, it is possible to prevent the displacement of the workpiece due to the deflection of the front and rear feed bars.

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.

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 directly receives the reaction force of the workpiece 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 the 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 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 die, by the difference.

In the transfer feeder of the present invention, the amount of movement of the rear feed bar 2 when the workpiece is clamped is determined by the distance at which the rear conveyance claw 2a comes into contact with the workpiece and stopped and the rear feed bar 2 from the urging means via the workpiece. The operation of the clamp mechanism of the rear feed bar actuating device 20 is controlled so as to have a length obtained by adjusting the amount of bending by the reaction force applied to. In other words, when the workpiece is clamped, even if there is a difference in the distance from the workpiece conveyance line L to the front and rear feed bars 1 and 2, the rear feed bar 2 is moved in the clamping direction by an amount corresponding to the difference. is there.
For this reason, the relative positions of the front and rear conveying claws 1a and 2a with respect to the mold in the clamping direction are arranged at the same position as when the front and rear feed bars 1 and 2 are not bent. The relative position of the workpiece with respect to the mold in the clamping direction can be kept constant regardless of the presence or absence of the bending of 1 or 2. Therefore, it is possible to prevent the displacement of the workpiece due to the difference in distance from the workpiece conveyance line L to the front and rear feed bars 1 and 2 and to accurately position the workpiece.

  In addition, due to the reaction force from the workpiece, the front feed bar 1 may not bend and only the rear feed bar 2 may be bent. In this case, the difference in the amount of bending between the front and rear feed bars 1 and 2 is as follows: Needless to say, the amount of flexing of the rear feed bar 2 becomes the same.

FIG. 1 is a plan view of a transfer feeder according to the present invention. It is a side view of the conventional transfer feeder.

Explanation of symbols

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

Claims (1)

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 actuating device is
In the case where the rear feed bar bends away from the front feed bar when the front and rear feed bars approach and support the workpiece with the front and rear transport claws, the rear feed bar is moved to the front feed bar. The distance approaching the bar is longer by the amount of deflection of the rear feed bar than the distance of the rear feed bar approaching the front feed bar when the rear feed bar is not deflected. A transfer feeder in a forging press characterized by being adjusted as described above.

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