JPH0128898Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a hydraulic punch holder used for fixing an upper die to the slide of a small press.

"Conventional Technology" Conventionally, the punch holder of a small press has a hole in the center of the lower surface of the slide of the press into which a shaft protruding from the center of the upper surface of the upper mold is fitted, and the front half of the hole is inserted in the front-rear direction along the slide. A movable holding member is often used, and the holding member is pressurized with two bolts screwed in the front and back direction from the front of the slide, and the shaft of the upper mold is tightened in the hole.

``Problems that the invention aims to solve'' Conventional punch holders require manual tightening using tools such as spanners each time the upper die is attached, which is cumbersome and difficult to maintain a constant tightening force. The installation was unreliable.

"Means and actions for solving the problems" The present invention eliminates these drawbacks by creating a hole in the lower slide surface of the press into which the shaft of the upper die is inserted, and a thin inner cylinder into which the shaft is fitted with a small clearance. and,
A booster pump consists of a cylinder consisting of a thick-walled outer cylinder that forms an oil-tight hydraulic chamber between the outer peripheral surface of the inner cylinder and supplies pressure oil to the overload safety device installed on the slide of the press. Pressure oil at a constant pressure was supplied to and discharged from the cylinder via an electromagnetic switching valve. The supply of pressure oil deforms the inner cylinder and tightens the shaft of the upper mold with a constant force, and the upper mold can be attached and removed simply by operating the solenoid switching valve, making operation quick and easy. Improves installation reliability.

"Example" In FIG. 1, at the center of the lower surface of the slide 1 of the press, there is a thin inner cylinder 3 that fits with a shaft protruding from the center of the upper surface of the upper die 2 with a small clearance.
The thick outer cylinder 5 is fitted oil-tightly to the outer periphery of both the upper and lower ends of the inner cylinder 3, and the inner diameter of the middle part is larger than the outer diameter of the inner cylinder 3, and the oil chamber 4 is formed therebetween. A cylinder device fixed with a lid 6 is provided. Outer cylinder 5
The tip of an oil supply pipe 7 fixed to the front surface of the slide 1 is oil-tightly fitted into the vertical center of the slide 1 and communicates with the oil chamber 4. The base of the oil supply pipe 7 is connected from a pressure oil discharge port of a booster pump 8 for an overload safety device equipped on the slide 1 via an electromagnetic switching valve 9, and is supplied with pressure oil at a constant pressure.

The booster pump 8 automatically operates the piston 10 by switching the pressure air using a sketch (not shown) that operates at the forward and backward limits of the piston 10, which moves forward and backward with pressure air, and moves the piston rod forward and backward into the hydraulic chamber 11. By doing so, the oil tank 12
The oil is pumped up from the check valve 13 through the check valve 1.
A known oil pump that discharges pressure oil from 4 and 15.
Automatically stops when the pressure oil reaches a certain pressure. Pressure oil discharged from the check valve 15 is supplied to an overload safety device (not shown).

The electromagnetic switching valve 9 is normally open to supply pressure oil to the oil supply pipe 7, and switches in response to a signal to discharge the supplied pressure oil. The electromagnetic switching valve 9 is a press operation panel (not shown)
It may be provided on the slide 1 or may be provided on the slide 1 and switched by a signal from the operation panel.

Next, we will discuss the effect. Slide the upper mold 2 1
When installing the upper mold 2 into the inner cylinder 3, a signal is sent to the electromagnetic switching valve 9 to switch to draining oil, and the shaft of the upper mold 2 is inserted into the inner cylinder 3. Subsequently, the electromagnetic switching valve 9 is switched to supply pressure oil to the oil chamber 4 via the oil supply pipe 7. The thin-walled inner cylinder 3 is elastically deformed and contracted by the supplied pressure oil, and the shaft of the upper mold 2 is tightened and fixed with a constant force. When removing the upper mold 2, the operations may be performed in the reverse order as described above.

"Effects of the Invention" According to the invention, since the thin-walled inner cylinder is provided, the upper die can be attached and detached simply by supplying and discharging pressure oil, making the operation quick and easy. Since a constant pressure oil is used, the tightening force is constant, ensuring reliable tightening and improving the reliability of upper mold installation.

Pressure oil switching operations can be performed from the press operation panel. The practical effects and benefits are great.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional right side view of the slide main part of the press according to the embodiment and its hydraulic circuit diagram. 1 is a slide, 2 is an upper mold, 3 is an inner cylinder, 4 is an oil chamber, 5 is an outer cylinder, 6 is a lid, 7 is an oil supply pipe, 8 is a booster pump,
9 is an electromagnetic switching valve, 10 is a piston, 11 is a hydraulic chamber, 12 is an oil tank, 13 is a check valve, 14 is a check valve, and 15 is a check valve.

Claims (1)

[Scope of utility model registration request] A holder for fixing an upper die to a slide of a mechanical press by tightening a shaft protruding from the upper surface thereof, the holder includes a thin-walled cylinder that is open at the lower surface of the slide and into which the shaft of the upper die is slidably fitted; An outer cylinder is fitted oil-tightly to the cylinder at the outer periphery of both upper and lower ends, and an oil chamber is formed between the outer periphery of the middle part of the inner cylinder, and pressurized oil is supplied and discharged from the oil chamber to attach and detach the upper die. A hydraulic punch holder characterized by: