JPS6339326B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air dicing device used in a press machine.

The air dictation device 6 according to the prior art includes:
In FIG. 2, the material is held by the blank holder 4 and the upper die 2 provided in the bed 8 of the press machine and provided at the upper end of the cushion pin 5, and as the slide 1 descends, the upper die 2 and the lower die This is to prevent "wrinkles" from forming on the product 9 when the molding process is performed using the method 3.

In the prior art, in the case of a setup change including a mold change, it is necessary to lower the cushion pad 10 so that the cushion pin 5 does not interfere with the mold change, that is, the running of the bolster 7.
Therefore, in order to lower the cushion pad 10 as quickly as possible, a rapid exhaust system is required to exhaust the compressed air within the dictation system. On the other hand, when starting press work using a new mold, the cushion pad 10 rises rapidly, which generates a shock. A control delay circuit device is required. These devices were indispensable, especially for large air duction devices.

However, the above-described rapid exhaust system and delay circuit system have problems in that they are expensive and uneconomical because compressed air is discarded when lowering the cushion pad.

The present invention has been made in order to solve these problems in the prior art, and aims to provide an air-saving dictation device that does not require the conventional quick exhaust valve and delay circuit. In an air dicing device used in a machine, a first piston operated by air pressure is accommodated in a cylinder provided in the bed of a press machine, and the piston has a first piston projecting from both ends of the cylinder. A first piston rod is provided, and the first piston is formed hollow including the rod portion to form a hydraulic chamber, a second piston is housed in the hydraulic chamber, and a second piston is provided in the second piston. The piston rod protrudes from the first piston rod and urges the second piston rod in the direction of compressing the hydraulic chamber, and a cushion pad is provided at the tip of the second piston rod to support a cushion pin, and the cylinder Also, a pipe for supplying air to the first
The gist is that a pipe for supplying oil is connected to the hydraulic chamber of the piston rod.

Next, details of the present invention will be explained based on illustrated embodiments.

FIG. 1 shows the dictation device of the present invention, and the bed of the press machine, the cushion pins placed on the cushion pads, etc. are omitted.

A cylinder 20 for an air dicing device is provided in the bed of the press machine, a first piston 21 is slidably accommodated in the cylinder 20, and the first piston 21 is supplied to the cylinder 20. It is installed so that it can be raised and lowered freely using compressed air. The first piston 21 has the cylinder 2
The first piston rod 2 protrudes from both ends of the
1a and 21a, and is formed hollow including the rod part, and the hollow part is connected to the hydraulic chamber 2.
2, and the second piston 23 is fitted here. A spring 24 is installed between the upper surface of the second piston 23 and the inner wall of the first piston 21, and the spring 24 pushes the second piston 23 into the hydraulic chamber 2.
2 in the direction of compression. Further, a stopper 25 is provided inside the first piston 21 to determine the upper limit position of the second piston 23.

The second piston 23 has a second piston rod 23 that protrudes from the first piston rod 21a.
a, and a cushion pad 26 is provided at the end of the rod. The cushion pad 26 also serves to support a cushion pin (not shown).

Further, a pipe 27 for supplying compressed air is connected to the cylinder 20, and the pipe 27 has an air tank 28, a solenoid valve 29, a regulator valve 30, etc., and is connected to the air line of the factory. There is. Furthermore, a pipe 31 for supplying hydraulic pressure is connected to the first piston 21, and the pipe 31 supplies oil from an oil tank 32 to a solenoid valve 34 and a check valve 3 using a pump 33 with a motor.
5, etc., to the piston 21. Note that the release valve 36 serves to return excess pressure oil to the oil tank 32.

Next, the operation of the present invention will be explained. During press work, hydraulic pressure is supplied to the first piston 21 to move the cushion pad 26 together with the second piston 23.
(state shown in Figure 1). That is, since the cushion pad 26 is integrated with the piston 21 via the pressure oil in the hydraulic chamber 22, when the cushion pad 26 is lowered, the first
Since the piston 21 moves down against the compressed air in the cylinder 20, the cushion functions due to the action of the air. When the press work is completed and the mold is to be replaced, the solenoid valve 34 is operated.
Then, the hydraulic pressure discharged from the pump 33 is applied to the solenoid valve 3.
4 to the pilot port of the check valve 35, the check valve 35 opens and opens the hydraulic chamber 22 to the oil tank 32. Therefore, the piston 23 receiving the downward force of the spring 24 descends together with the cushion pad 26, and the hydraulic pressure in the hydraulic chamber 22 is returned to the oil tank 32. In this case, the compressed air being supplied to the cylinder 20 is kept supplied.

The mold replacement is performed while the cushion pad 26 is lowered, and when the replacement work is completed, hydraulic pressure is supplied to the hydraulic chamber 22 via the solenoid valve 34, and the cushion pad 26 is raised. The state shown in FIG. 1 is now established again, and the pressing operation can be started.

As explained above, the present invention eliminates the need for a device for exhausting compressed air, that is, a quick exhaust valve, for replacing molds, eliminates the need to discard compressed air, and reduces press work. At the start, there is no impact when the cushion pad rises, and therefore there is an advantage that no special device for impact prevention is required.

In addition, there is no need to lower the first piston that accommodates the second piston in order to process the cushion pin, and it only needs to be stroked as the original cushion, so the overall length of the cushion device is shortened, especially when used in multiple stages. In the cushion device, the effect is increased.

[Brief explanation of the drawing]

FIG. 1 is a side view of the entire assembled dictation device of the present invention, and FIG. 2 is an explanatory diagram schematically showing a dictation mechanism according to the prior art. 20...Cylinder, 21...First piston,
22... Hydraulic chamber, 23... Second piston, 24
... Spring, 25 ... Stopper, 26 ... Cushion pad, 27 ... Piping, 28 ... Air tank,
29... Solenoid valve, 30... Regulator valve, 3
1... Piping, 32... Oil tank, 33... Pump, 34... Solenoid valve, 35... Check valve, 36... Release valve.

Claims (1)

[Claims] 1. In an air dicing device used in a press machine, a first piston operated by air pressure is accommodated in a cylinder provided in the bed of the press machine, and the piston has a piston that protrudes from both ends of the cylinder. A first piston rod is provided, and the first piston is formed hollow including the rod portion to form a hydraulic chamber, a second piston is accommodated in the hydraulic chamber, and the second piston is provided with a hydraulic chamber. Providing a cushion pad that causes a second piston rod to protrude from the first piston rod and bias the second piston rod in a direction to compress the hydraulic chamber, and supports a cushion pin at the tip of the second piston rod; A pipe that supplies air to the cylinder, and
A dictation device characterized in that a pipe for supplying oil is connected to the hydraulic chamber of the first piston rod.