JPH0315235Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clamping device for a transfer feeder for a forging press, and more particularly to a clamping device in which the upper jaw constitutes a so-called rotating jaw type clamping mechanism.

(Prior art and its problems) As is well known, automation of hot forging is desired for the relief and safety of workers from harsh working environments. Therefore, a transfer feeder device for hot forging presses has been developed and widely used.
Needless to say, such a transfer feed device is useful when performing a multi-step forging process, in which the forged product is divided into molds divided into process orders (for example, crushing, rough punching, finishing punching, etc.), and the forged product is symmetrically and It is a device that continuously feeds an asymmetrical workpiece (material), and its main parts consist of a feed bar and a gripper. As shown in the figure, the approach/separation operation (clamping the workpiece,
The three-dimensional movement (unclamp), vertical movement (lift, down), and forward/backward movement (advance, return) is repeated to perform sequential feeding. Pneumatic, hydraulic, mechanical, and other types of drive sources are known, but in any case, high-speed conveyance is required in order to improve productivity and prevent a drop in the temperature of the workpiece.

By the way, conventional transfer feed devices use a clamping method in which a pair of feed bars extending in the front and back directions are used to clamp the workpiece in the forward and rearward direction relative to the conveyance direction of the workpiece. Those that are clamped and transported (for example, see Utility Model Publication No. 1868-1983), and
The work was simply scooped up with claws and transported.

Therefore, if the above-described request for high-speed conveyance is met, the acceleration increases, causing the workpiece to fly out during conveyance. Furthermore, if high-speed conveyance was adopted, there was a problem in that even the slightest vibration of the feed bar would cause abnormalities in the work ramp caused by the claws.

In order to solve this problem, a clamping device as shown in the specification of Japanese Utility Model Application No. 195146/1988 has been developed. In this method, a gripper consisting of a lower claw and an upper claw is provided on the feed bar, and the pair of lower claws grips the workpiece from both sides at the lower part of the flange, and the upper claw is moved in the clamping direction of the feed bar to grip the workpiece. It is configured to open and close in a manner such that the upper claw presses the workpiece flange toward the lower claw. However, with this device,
It is not possible to adjust the opening/closing amount of the upper claw, and each part becomes smaller due to the limited installation space, which makes it difficult to obtain the opening/closing stroke of the upper claw and sufficient clamping force to clamp heavy forged products, resulting in poor durability. The disadvantage was that it was lacking.

(Means for solving the problem) Therefore, the present invention has a structure that allows the accommodation space for the spring that biases the upper claw to be as large as possible, and also simplifies the whole structure and increases the rigidity and durability of each component. To provide a clamping device for a transfer feeder for a forging press, which can secure a necessary and sufficient clamping force with an upper claw, and can adjust the opening/closing amount of the upper claw depending on the workpiece.

The present invention provides a clamping device for a transfer feeder for a forging press, which has a pair of feed bars that are arranged on both sides of a forging die and perform three-dimensional rectangular movements such as approaching and separating movements, up and down movements, and forward and backward movements. a claw holder provided so as to be movable in and out of the direction; a lower claw fixed to the claw holder; and an upper claw pivotally attached to the claw holder;
The upper claw positioning member is held by the feed bar so as to engage with the upper claw and is urged toward the work by a spring, and has an adjustment screw mechanism for adjusting the protruding position of the upper claw positioning member. , by moving the pair of feed bars toward each other against the spring while the workpiece is being held between the pair of lower jaws, the upper jaw is directed toward the workpiece flange by the upper jaw positioning member. The workpiece flange is pressed against the workpiece flange by being pushed around.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a clamp device in a transfer feeder according to an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view of the embodiment of FIG. In this embodiment, a pair of feed bars 1 are arranged parallel to the workpiece conveyance direction on both sides of a plurality of molds arranged in the workpiece conveyance direction, and a workpiece gripping device (clamp device) attached to the feed bar 1 is used to control the workpiece conveyance. Although it is configured symmetrically with respect to the center, only the right half is shown in the figure.

A plurality of guide blocks 17 are fixed to the upper surface of the feed bar 1 at distances in the longitudinal direction by bolts 15, and a holder guide part 2 and a clamp rod guide part 1 are attached to the guide blocks 17 and above the guide blocks 17, respectively.
1 is formed. A hollow claw holder 4 is inserted into the holder guide portion 2 so as to be slidable laterally with respect to the feed bar 1 . The sliding stroke of the pawl holder 4 with respect to the feed bar 1 is restricted, and for this purpose, as shown in FIG. It is buried in Claw holder 4
A first spring 6 is installed in the hollow portion between the inner end of the hollow portion and the pin 3, thereby constantly pressing the claw holder 4 toward the workpiece.

A lower claw 7 whose tip is forked as shown in FIG. supported. A recess 8a is formed near the upper side of the shaft support of the upper claw 8.

Clamp rod guide part 1 on top of feed bar
1 is penetrated by a clamp rod 12 which also serves as an upper pawl positioning member. As best shown in FIG.
There is a storage chamber 18 for the second spring 10 inside.
is formed, and the second spring 10 is mounted in this accommodation chamber between a spring receiving fin formed in the middle of the clamp rod and the rear wall of the accommodation chamber. At the tip of the clamp rod 12, there is a second
As shown in the figure, a T-shaped portion 12a is formed which is loosely fitted into a recess 8a at the rear end of the upper claw 8, and an adjustment nut 1 is attached to a male threaded portion formed at the outer end of the rod.
3 is screwed on. The clamp rod 12 is always pressed toward the tip side by the second spring 10, so that one end surface of the adjusting nut 13 is pressed against the clamp rod guide portion 11 by this spring force.
The clamp rod 12 comes into contact with the outer end of the clamp rod 12, thereby regulating the position of the tip of the clamp rod 12 with respect to the guide portion 11. This position can be adjusted by operating the adjustment nut 13.

With such a configuration, the clamping operation of the workpiece 14 having the collar portion 14a on the periphery will be explained. The feedbar 1 repeats the above-mentioned three-dimensional operation, but as for the clamp stroke, the feedbar 1
Perform the operation between AD, ie SO, as shown in the figure. At position A, the lower claw 7 is separated from the workpiece 14 after unclamping, the claw holder 4 is pushed toward the workpiece 14 by the first spring 6, and the upper claw 8 is in contact with the recess 8a and the clamp rod 12. When engaged with the T-shaped portion 12a, it is in an upwardly opened state about the pivot 9 as a fulcrum. At position B, where the feed bar approaches the workpiece 1 from this position, the lower claw 7 abuts against the circumference of the workpiece below the collar 14a of the workpiece 14 (the state shown in FIG. 1). When it further approaches the C position, the claw holder 4 resists the first spring 6 and moves the workpiece 1.
4 and moves outward relative to the feed bar 1 as shown in FIG. Rotate clockwise to press the workpiece collar 14a against the lower claw 7. Next, feed bar 1 approaches the workpiece side by a distance of S ₂ , and D
Stop at a position. The movement of the feed bar 1 to the D position ensures the clamping operation, and the first
The amount of movement is absorbed by the spring 6. After that, the feed bar 1 performs lift->advance->down->unclamp->return operations to transport the workpiece to the next process.

The opening/closing stroke of the upper pawl 8 can be changed by adjusting the position of the T-shaped portion 12a of the clamp rod 12 using the adjusting nut 13. Adjustment nut 1
3, when the clamp rod 12 is moved toward the workpiece (position a in FIG. 5), the opening degree of the upper jaw 8 becomes smaller as shown by the broken line 20 in FIG. ) As shown by the broken line 21, the opening degree of the upper claw becomes large. Clamp rod 12 depending on the type of work or the thickness shape of the work flange.
Adjust the setting position to obtain the appropriate opening degree and clamping force.

(Effect of the invention) As explained above, according to the clamping device according to the invention, since the upper jaw is rotated using the movement of the feed bar in the clamping direction to clamp the workpiece, a special drive for clamping is required. A reliable clamping action is achieved with a simple mechanism without the need for a power source. Since the upper claw performs a pressing operation against the elastic force of the spring, it is possible to absorb over-approaching of the feed bar due to variations in the workpiece, and unclamping can also be performed automatically. The opening degree of the upper jaw and the clamping force can be easily adjusted by operating the adjustment nut. Furthermore, the housing chamber for the spring that biases the clamp rod is enlarged in a limited space, and the shape of the clamp rod and other parts can be made larger. Therefore, it has high durability as a whole and has the effect of ensuring sufficient clamping force.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a clamp device in a transfer feeder according to an embodiment of the present invention, Fig. 2 is a partially cutaway plan view of the embodiment of Fig. 1, and Fig. 3 is a line taken along the - line in Fig. 1. FIG. 4 is a cross-sectional view of the embodiment of the present invention during clamping, FIG. 5 is a cross-sectional view showing the adjustment state of the opening/closing stroke of the upper claw, and FIG. 6 is a cross-sectional view of the embodiment of the present invention applied to the present invention. FIG. 3 is a schematic diagram of the three-dimensional movement of the feed bar. 1...Feed bar, 2...Holder guide section,
4... Claw holder, 5... Elongated hole, 6... First spring, 7... Lower claw, 8... Upper claw, 8a... Recess, 9... Pivot, 10... Second spring, 1
1... Clamp rod guide section, 13... Adjustment nut, 14... Workpiece, 14a... Collar section.

Claims (1)

[Scope of utility model registration request] A clamping device for a transfer feeder for a forging press having a pair of feed bars arranged on both sides of a forging die and performing three-dimensional rectangular movements of approaching and separating movements, up and down movements, and forward and backward movements,
a pawl holder provided on the feed bar so as to be removable in the lateral direction; a lower pawl fixed to the pawl holder; an upper pawl pivotally attached to the pawl holder; and an adjustment screw mechanism for adjusting the protruding position of the upper claw positioning member, the upper claw positioning member being held in place and urged toward the workpiece side by a spring, and an adjustment screw mechanism for adjusting the protruding position of the upper claw positioning member. By holding the workpiece with the lower claws and in this state further approaching the feed bar against the spring, the claws are pushed around in the direction of pressing the workpiece flange portion by the upper claw positioning member. A clamping device for a transfer feeder for a forging press, which is characterized by: