JPH0727063Y2 - Processing machine clamper - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is for fixing a metal mold or a workpiece to a processing machine such as a metal processing press, a die casting machine, an injection molding machine and a machine tool. Regarding the clamper.

[Conventional technology]

The clamper of the processing machine must have a structure that allows easy replacement of the mold and the like, and must be safe so that the mold and the like can be reliably clamped during the working operation. The following are known as clampers for this processing machine.

Japanese Utility Model Publication No. 59-40984 discloses a device relating to a clamper for a processing machine as shown in FIG. Sixth
The clamper of the conventional processing machine will be described with reference to the drawings. The leg 31a of the clamper body 31 of the clamper C is attached to the bolster B _0, and the mold D ₁ is clamped by the clamp claw 32 to the bolster B _0.
It is configured to be pressed and fixed to. The clamp mechanism of this conventional clamper is as follows.

The slide guide hole 33 parallel to the upper surface of the bolster is the clamper body 31.
The actuating shaft 34 is slidably inserted into the guide hole 33, and the actuating shaft 34 is biased by the drive spring 35. 36 is an oil chamber to which pressure oil is supplied, and by supplying pressure oil to this oil chamber 36, the operating shaft 34 is retracted from the upper surface of the mold D ₁ against the spring force of the drive spring 35, The mold D _{1 is} to be replaced. Further, by letting the pressure oil in the oil chamber 36 escape, the operating shaft 34 advances to the upper surface of the mold D ₁ by the spring force of the drive spring 35, and the locking portion 32a of the clamp claw 32 stops at the stopper 37.
The clamp claw 32 clamps the mold D ₁ by the force generated by the spring force of the drive spring 35 being expanded by the wedge action.

[Problems to be solved by the device]

The structure capable of reliably maintaining the clamping force during the machining operation is an essential factor in the machining operation and safety in the clamper of the present invention. In particular, when the upper die cannot be clamped for some reason, such as when the upper die is clamped, the die moves and falls, which is extremely dangerous.

However, the clamping force of the conventional clamper is the drive spring 35.
Since it depends on the spring force of, the spring force is exhausted as a result of many years of use, and the clamping force becomes 100% unreliable.

The present invention has been made in view of the above problems of the conventional technique, and an object thereof is to reliably hold a die or a workpiece during a working operation and to smoothly perform the working operation. It is to provide a clamper for a processing machine capable of performing the above.

[Means for Solving the Problems]

In order to achieve the above object, the gist of the present invention is to cover a piston 3 slidably arranged in a clamper body 1 with a head cover 5 and to provide a long hole 8 parallel to the moving direction of the piston 3.
Is formed in the clamper main body 1, and the clamp claw 7 that abuts against the tip of the piston 3 is rotatably supported by the support pin 9 slidably inserted in the elongated hole 8, and the clamp oil supply port 15 is attached to the clamper main body 1. In the clamper of the processing machine in which the unclamp oil supply port 16 is formed, the piston 3 is held by the holding spring 6 arranged in the portion covered by the head cover 5.
Is pressed in the clamping direction, and the clamp claw 7 is clamped by the claw return spring 12 and the piston 3 which are arranged in the recess 13 formed in the clamp claw 7 so as to be located slightly above the force point 3a of the piston 3. It is in a clamper of a processing machine, which is characterized by

In order to hold a predetermined clamping force by the holding spring alone and allow the clamp claw to be housed in the clamper body in the unclamping state, the spring force of the holding spring is 8 to 15% of the clamping force by fluid pressure. preferable.

[Action]

The pressure fluid supplied to the holding spring 6 and the clamper body 1 presses the clamp claw 7 via the piston 3, and the support pin 9 supporting the clamp claw 7 slides along the long hole 8 to form the long hole 8 When the piston 3 still presses the clamp claw 7 when it reaches the end, the clamp claw 7 rotates about the support pin 9 and clamps the mold or the like.

Although it can be clamped as described above, since it is clamped by both the spring force of the holding spring 6 and the fluid pressure, the clamping force is held by the spring force of the holding spring 6 even when the supply of pressure fluid is cut off. it can.

Further, the clamp claw 7 is sandwiched between the piston 3 and the claw return spring 12, and the claw return spring 12 is disposed slightly above the force point portion 3a of the piston 3, and the claw return spring 12 is provided.
Since the clamp claw 7 is pressed and held to the piston 3 side by 12, the tip of the clamp claw 7 does not hang down while the clamp claw 7 is moving, and the clamp-unclamp operation can be performed smoothly.

Further, at the time of unclamping, since the clamp claw 7 can be housed in the clamper main body 1 by the spring force of the claw return spring 12, the attachment and detachment of the workpiece and the tool are not hindered.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 1 is a clamper body, and a stepped guide hole composed of guide surfaces 2a and 2b is bored in the clamper body 1.

3 is a large-diameter portion (portion with diameter D) and a small-diameter portion (portion with diameter d)
A piston having a stepped portion made of
The large diameter portion and the small diameter portion are slidable along the guide surfaces 2a and 2b, respectively. A portion surrounded by the large-diameter portion of the piston 3, the small-diameter portion of the piston 3, the guide surface 2a, and the protruding portion 1a of the clamper body 1 forms a cylinder front chamber 4.

Reference numeral 5 is a head cover, and a cylinder rear chamber 4'is formed in a portion where the piston 3 is covered with the head cover 5, and a holding spring 6 is arranged in the cylinder rear chamber 4 '. Direction (clamping direction). The force point portion 3a at the tip of the piston 3 is in contact with the clamp claw 7 having a substantially inverted L-shaped cross section.

A long hole 8 is formed through the clamper main body 1 in parallel with the moving direction of the piston 3. A support pin 9 is slidably inserted into the long hole 8 to support the clamp claw 7 by the support pin 9. When the support pin 9 reciprocates along the elongated hole 8, the clamp claw 7 repeats the clamped state (position C) and the unclamped state (position U).

In the position C, the protrusion 9a of the support pin 9 contacts the roller 10a of the control microswitch 10, and in the position U, the protrusion 9b of the support pin 9 contacts the roller 11a of the control microswitch 11. Contact. (Refer to FIG. 3) A pawl return spring 12 for holding the clamp pawl 7 together with the piston 3 is arranged slightly above the force point portion 3a of the piston 3, and the clamp pawl 7 accommodates the pawl return spring 12 therein. Possible recesses 13 are formed. 14 is a claw return spring 12
It is a spring retainer that holds down.

Reference numerals 15 and 16 denote a clamp oil supply port and an unclamp oil supply port, which are provided in the clamper body 1 in a recessed manner. The clamp oil supply port 15 communicates with the cylinder rear chamber 4 ′, and the unclamp oil supply port 16 communicates with the cylinder front chamber 4.

D ₂ is a mold and B is a surface plate.

The hydraulic circuit will be described with reference to FIG. Reference numeral 17 is a hydraulic pump, 18 is a non-leak hydraulic pressure switching valve, the hydraulic pump 17 communicates with the cylinder front chamber 4 through a pipe 19a, and a pipe 19b branched from the middle of the pipe 19a has a non-leak hydraulic pressure switching valve 1
8 and the non-leak hydraulic switching valve 18 communicates with the cylinder rear chamber 4'through a pipe 19c. 20 is an oil tank.

The clamp and unclamp mechanism of the present invention configured as described above will be described below.

First, when the operation of the hydraulic pump 17 is started, the force point portion 3a of the piston presses the clamp claw 7 by the pressure oil supplied to the cylinder rear chamber 4'and the spring force of the holding spring 6, and the clamp claw 7 is supported by the support pin 9 And move it to the left. And
When the piston 3 further presses the clamp claw 7 when the support pin 9 reaches the end of the elongated hole 8, the clamp claw 7 rotates leftward about the support pin 9 and the mold D ₂ is moved to the surface plate B. Clamp firmly on top. At this time, even if the hydraulic power source is cut off for some reason, the mold D ₂ holds the clamped state by the spring force of the holding spring 6. (Refer to Clamping State C) In this embodiment, the spring force of the holding spring 6 is 8% of the hydraulic clamping force.

Next, when the non-leak hydraulic pressure switching valve 18 is switched to drain the oil from the cylinder rear chamber 4'and return it to the oil tank 20, the piston 3 is set to π (D ² −d ² ) p with the hydraulic pressure being p. /
A force of 4 (also called piston return force) acts to the right. In this embodiment, if the spring force of the holding spring is s, the values of D, d, p and s are set so that the piston return force exceeds the spring force s.
The piston 3 moves to the right against the spring force of the holding spring 6. As a result of the releasing of the clamping force by the piston 3 in this way, the clamp claw 7 moves to the right by the claw return spring 12 and is housed in the clamper body 1. (Refer to the unclamped state U) Since the clamp claw 7 is sandwiched between the claw return spring 12 and the piston 3, the tip 7a of the clamp claw 7 is moved while the clamp claw 7 is moving.
Does not drip.

FIG. 5 is a diagram showing a second embodiment, in which case the piston 21
The inside of this is a cavity 22, and the holding spring is inside this cavity 22.
23 is provided and is sealed by a head cover 24.
Further, in this embodiment, the clamp oil supply port 25 and the unclamp oil supply port 26 are provided on the side of the clamper body 1. The overall operation is the same as that of the first embodiment, so the description thereof will be omitted. However, even in the case of this embodiment, even if the hydraulic source is cut off during machining by clamping the mold, the spring force of the holding spring 23 causes the predetermined operation. Clamping force is maintained.

[Effect of the device] The mold is firmly clamped by the hydraulic pressure and the spring force of the holding spring, and even if the hydraulic power source is cut off, the clamping claw continues to securely clamp the mold by the spring force of the holding spring.
There is no risk of damage to the equipment or personal injury due to molds or processed products falling off, and safe machining can be continued.

By the action of the claw return spring, the clamp claw can be housed in the clamper main body at the time of unclamping, so that the mold and the processed product can be safely attached and detached with the clamper attached.

The clamp claw is sandwiched between the piston and the claw return spring, and the claw return spring is located slightly above the force point of the piston.The clamp claw is pressed and held on the piston side by the claw return spring. The tip of the clamp claw does not hang down during movement of the claw, the workpiece is not damaged by the clamp claw, and the clamp-unclamp operation can be performed smoothly.

[Brief description of drawings]

FIG. 1 is a plan view of a clamper of a processing machine according to the present invention,
2 is a longitudinal sectional view of FIG. 1 taken along the line EE, FIG. 3 is a view showing a contact state between a support pin and a control micro switch, FIG. 4 is a schematic configuration diagram of a hydraulic circuit, and FIG. Is a vertical sectional view showing another embodiment of the present invention, and FIG. 6 is a vertical sectional view of a conventional clamper. 1 ... Clamper body, 3 ... Piston, 5 ... Head cover, 6 ... Holding spring, 7 ... Clamp claw, 8 ... Long hole, 9 ... Support pin, 12 ... Claw return spring, 13 ... Recess, 15 …… Clamp oil supply port, 16 …… Unclamp oil supply port

Claims (1)

[Scope of utility model registration request] 1. A piston 3 slidably disposed in a clamper body 1 is covered with a head cover 5, and an elongated hole 8 parallel to the moving direction of the piston 3 is formed in the clamper body 1.
A clamp claw 7 that abuts the tip of the piston 3 is rotatably supported by a support pin 9 that is slidably inserted in the elongated hole 8, and a clamp oil supply port 15 and an unclamp oil supply port 16 are provided in the clamper body 1. In the clamper of the processing machine having the above-mentioned structure, the holding spring 6 arranged in the portion covered by the head cover 5 is formed.
The piston 3 is pressed and urged in the clamping direction by means of the claw return spring 12 and the piston 3 which are arranged in the recess 13 formed in the clamp claw 7 so as to be located slightly above the force point 3a of the piston 3. Clamper for processing machine characterized by holding 7