JPH0445689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clamping device for a mold, etc., and more specifically, it is capable of responding to changes in the thickness of an object to be clamped and accurately fixing it in a predetermined position. This invention relates to a clamp device.

(Prior art) Conventional clamping devices tighten the object to be clamped, such as a mold (hereinafter simply referred to as a mold), by converting the driving force of a cylinder such as hydraulic pressure into a rotational pressing force using a lever motion using the pivot of a clamp lever as a fulcrum. It has a relatively simple fixed structure.

However, with this simple structure, the rotating pressing force of the crank lever does not directly become the clamping force of the mold, but is divided into a force perpendicular to the clamp (vertical axis) and a horizontal force (horizontal axis). There are many. In other words, if the position of the mold and clamp is exactly horizontal, the rotational pressing force of the clamp lever will act perpendicularly to the mold, but if it deviates even slightly from the horizontal position and becomes diagonal, the above component force will be applied. I end up working. In reality, the thickness of the mold is not always constant and often deviates from the horizontal position, so component force acts, and as a result, the horizontal axis of the component force pulls in the horizontal direction, causing the mold to There are many cases where it is shifted. Therefore, it is difficult to fix the mold in an accurate position, which causes a drop in precision during press work, for example.
Furthermore, the installation work requires a considerable amount of skill and effort, which is also a factor that reduces work efficiency.

Nowadays, there are many types of high-mix, low-volume production, so the thickness of the mold is no longer constant, and the above-mentioned tendency is increasing more and more.

Therefore, as disclosed in Japanese Utility Model Application Laid-Open No. 56-23222, a clamping device has been proposed in which the position of the clamp can be adjusted in three stages to cope with changes in the thickness of the mold.

However, since this method can only handle three stages intermittently, it cannot handle molds with other thickness dimensions, resulting in a certain limit. Furthermore, even if one of the three stages is selected, the height of the clamp must be changed accordingly, which has the disadvantage of prolonging the working time.

(Problems to be Solved by the Present Invention) The present invention has been made to solve the above-mentioned problems, and is designed to allow the tip of the toe to move vertically in response to changes in the thickness (height) of the mold. This is an attempt to suppress the generation of component force on the horizontal axis so that the mold can be fixed in an accurate position, and to automate and speed up the work.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a base F of a press function with a vertical reciprocating engine 3 whose drive source is hydraulic pressure or the like, and a piston head 3a of the vertical reciprocating engine 3. The base end 4a of the crank lever 4, which is allowed to rotate about the intermediate pivot 4b, is brought into contact with the crank lever 4.

The tip 4c of the crank lever 4 is brought into contact with the upper part of the clamp claw 5, and the clamp claw 5 is rotated in conjunction with the rotation of the crank lever 4.
is adapted to be guided into a vertical motion along a vertical guide groove 8 bored from a guide stand 6 installed on the base F to the base F.

Further, a spring groove 5g is provided on the back of the clamp claw 5, and a spring mechanism 7 is interposed between the spring groove 5g and the base F, so that the clamp claw 5 is always tilted backward with respect to the base F. The clamp device is configured such that the clamp claw 5 is returned from the vertical direction to the reverse rotation direction when the crank lever 4 is released from the pressing force of the crank lever 4.

(Function) When the workpiece 1 is clamped to the die set and the vertical reciprocating engine 3 is operated, the piston head 3a pushes up the base end 4a of the clamp lever 4, and the intermediate pivot 4
The clamp lever 4 rotates clockwise using b as a fulcrum. As a result, the tip 4c presses the upper part of the clamp claw 5 and initially pushes the clamp claw 5 down in the rotational direction against the elasticity of the spring mechanism 7, but as it descends, the lower end of the clamp claw 5 Guided by the guide groove 8, the trajectory is gradually corrected in the vertical direction, and finally the movement is converted into a vertical motion, and the workpiece 1 is clamped by the vertical pressing force of the upper claw portion 5a.

When removing the workpiece, the vertical reciprocating mechanism 3 is reversely operated, and the clamp claw 5 is released from the pressing force of the crank lever 4, and the restoring force of the spring mechanism 7 moves the clamp claw 5 in the vertical direction. It is then returned to the opposite direction of rotation (Fig. 5).

(Embodiment) The following will explain the embodiment of the drawings using a press as an example. In FIGS. 1 and 2, F is a press machine base, and the base F is equipped with the clamping device of the present invention. .

In other words, 3 is a vertical reciprocating engine whose driving source is hydraulic pressure.
A base end 4a of a crank lever 4, which is allowed to rotate about an intermediate pivot 4b, is brought into contact with the piston head 3a of the vertical reciprocating engine 3, and a distal end 4c of the crank lever 4 is brought into contact with the top of the clamp claw 5. has been brought into contact with.

This clamp pawl 5 has a shape as if it were the bastard of a side dragon, and has a bifurcated upper part including the pawl part 5a, and has a tip 4c of the crank lever 4 at its crotch bottom.
The body part 5c is formed vertically, and a spring groove 5g is provided on the back thereof.Furthermore, the front part of the lower end part is formed in a curved shape or a notch shape 5d, and the other part has a notch 5e in the rear part. In addition to providing the tail portion 5f
It is constructed by protruding.

The lower part of the clamp claw 5 is fitted into a vertical guide wire 8 drilled from the guide table 6 installed on the base F to the base F, and the spring groove 5 on the back
Due to the elasticity of the spring mechanism 7 interposed between the crank lever 4 and the base F, the crank lever 4 is always tilted backward relative to the base F while being associated with the tip end 4c of the crank lever 4.

When this clamp claw 5 is pressed by the tip 4c of the clamp lever 4, as it descends, it is guided from the lower end of the clamp claw 5 into the vertical guide groove 8, gradually correcting its trajectory in the vertical direction, and finally moves vertically. The workpiece (mold) 1 is clamped by the vertical pressing force of the upper claw portion 5a.

Note that FIG. 3 shows the tip 4c of the clamp lever 4.
This figure shows an embodiment of the relationship between the upper part of the clamp claw 5 and the upper part of the clamp claw 5. FIG. 1a shows the embodiment shown in FIG. The manner in which it comes into contact with
Figure b shows how the rotor 5h is pivotally supported on the body of the clamp claw 5 and the tip 4c of the clamp lever 4 comes into contact with the rotor 5h, and figure c shows how the tip 4c of the crank lever 4 is guided. A mode in which a pin 4e is provided protrudingly and the guide pin 4e is fitted into a guide horizontal hole 5i provided on the side of the clamp claw 5 and is slid and pressed is as follows.
Show each.

(Function in Embodiment) In the above embodiment, in addition to the above-mentioned effect, the clamp claw 5 is shaped like a dragon's bastard, and the front part of the lower end of the clamp claw 5 is curved or notched. 5d, the lower end of the clamp claw 5 can be smoothly guided into the vertical guide groove 8. Furthermore, since the notch 5e is provided at the rear, the return movement of the clamp claw 5 by the spring mechanism 7 (vertical (conversion from motion to rotational motion) is performed smoothly, and furthermore, since the tail portion 5f is provided protrudingly, the clamping force of the claw portion 5a of the clamp claw 5 is strengthened from the diagonal angle (the fifth
figure).

(Effects of the Invention) Based on the above configuration, the present invention has the following advantages: the pressing force of the clamp lever is applied to the vertically shaped body, which presses the mold vertically along the guide table;
There is no horizontal component force generated in the horizontal direction of the clamp claw, and only vertical force is generated, allowing accurate positioning. Therefore, the conventional problem in which a horizontal force in the transverse axis direction shifts the mold position is solved, and it becomes possible to accurately perform the tightening work associated with pressing work and the like.

Furthermore, since the height of the clamp claws changes continuously in accordance with the guide hole of the guide stand, it can be adapted to any thickness of the object to be clamped, making it most suitable for production of a wide variety of products in small quantities.

In addition, the fixing method is such that the clamp claw moves vertically and stops at the height of the mold, so the height is automatically adjusted, making pressing work very efficient without the need for troublesome adjustment work. This invention is extremely advantageous for process improvement.

Although the example of the object to be clamped has been explained using a press mold as a representative example, the present invention can also be applied to other machine tools such as machining centers and injection molding machines, and workpieces of molding machines.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the clamp device of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 a, b, and c show engagement between the clamp lever and the clamp claw. FIGS. 4a and 4b are side views showing the lower end of the clamping claw, and FIGS. 5a, b, and c are schematic side views showing the operating state of the device of the present invention. figure. F... Base, 3... Vertical reciprocating engine, 3a... Piston head, 4... Crank lever, 4a... Base end, 4
b... intermediate pivot, 4c... tip, 4e... guide pin, 5... clamp claw, 5a... claw, 5b... back,
5c...Body part, 5d...Curved shape or notch shape, 5e...Notch, 5f...tail part, 5g...spring groove, 5h...rotor, 5i...horizontal guide hole, 6...guidance stand, 7...spring mechanism, 8...vertical Guiding groove.

Claims (1)

[Claims] 1. In a clamping device installed on a base F of a press, etc., a vertical reciprocating engine 3 whose driving source is hydraulic pressure or the like, and a base end 4a connected to a piston head 3a of the vertical reciprocating engine 3, an intermediate pivot 4b is connected. The crank lever 4 moves in a deco-movement manner as a fulcrum, and the crank lever 4 rotates along a vertical guide groove 8 that is connected to the tip 4c of the crank lever 4 and is bored from the guide table 6 installed on the base F to the base F. The clamp claw 5 is guided to be converted into a vertical motion, and the clamp claw 5 is attached to the base F and the back of the clamp claw 5 in order to return the clamp claw 5 from the vertical direction to the reverse rotation direction in a state where it is released from the pressing force of the crank lever 4. Spring groove 5 provided
A clamp device consisting of a spring mechanism 7 interposed between g.