JPS5928440B2 - Automatic pressure stop device for hydraulic press - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic pressurization stop device for a hydraulic press.

Conventionally, a system in which a cam plate driven by a motor is used to open and close an operating valve in a hydraulic press has been widely adopted.

This method is usually called a cam-operated valve, and the pressure stop is controlled by a motor using a manual operation bundle to open and close the valve.According to this method, the pressure stop position is determined by the operator's skill. This has the disadvantage of causing severe mental fatigue for the operator and significantly reducing work efficiency.

To avoid this, the motor is controlled by a pressurization stop command.
There is also a method of forcibly returning the cam plate to open and close the operating valve, regardless of the rotational position of the operating handle, but with this method, the accuracy of pressurization and stopping is determined by the load condition of the motor. There are some difficulties.

In addition, in both of these methods, in a normal hydraulic press that uses an accumulator for pressurized water, when the pressurization stop position is reached,
There is an inconvenience that since the motor stops at that point, the pressurized state continues.

This invention was made with the aim of eliminating the above-mentioned conventional drawbacks, and an operation valve operated by a fluid pressure cylinder and a solenoid valve is provided between the conventional cam type operation valve and the cylinder, and the solenoid valve is operated by a hydraulic cylinder and a solenoid valve. A pressurization stop command is given to close the operation valve, and the pressurization is stopped at a predetermined position.

One embodiment will be described below based on the drawings. 1 is a press frame, 2 is a double-acting cylinder fitted to this press frame, and a slide 4 is attached to the lower end of a piston 3 fitted inside the cylinder. is installed.

The chambers A and B formed above and below the piston in the cylinder 2 are communicated with each other via conduits 5, 6 and 7, and a cam type operation valve 8 and an operation valve 9 provided in the conduit system.

The cam type operation valve 8 has a pipe line 1 communicating with the accumulator.
a hole 11 connected to 0, a hole 12 connected to conduit 5,
It has a hole 13 connected to the pipe line 6, the hole 11 communicates with the hole 13 through a pressurized water supply valve 14 provided therein, and the hole 12 through a pullback water supply valve 15, and the holes 12 and 13 communicate with the hole 13 through a pressurized water supply valve 14 provided therein. , drain valves 16 and 1 provided respectively.
7 and communicates with the drain hole 18 .

These water supply and drainage valves 14 to 17 are opened and closed by cam plates 19a to 17.
Oshiage Rondo 20a-2 moves up and down following the rotation of 19d.
This is done by vertical movement of 0d, and the cam plates 19a to 19d
The rotation of the speed reducer 23 and the transmission mechanism 2 is driven by the motor 22 controlled by the manual operation band 7/21.
4.

The operating valve 9 has an internal hole 25 connected to the pipe line 6 and a hole 26 connected to the pipe line 7, and the front 25 has at least two or more water supply valves 2γ.

28, and the bore 25 communicates with the bore 26 through these water supply valves 27,28.

The opening and closing of the water supply valves 27 and 28 is controlled by ζ liquid pressure, for example, a push-up rod 3L32 operated by hydraulic cylinders 29 and 30.
The operation is carried out by the vertical movement of the
The oil supplied by the pump 33 is supplied to the hydraulic cylinder 29.3.
When the push-up rod 31.32 is raised to the lower chamber of the hydraulic cylinder 29.300 and the water supply valve 27.28 is opened and the solenoid valve 34.35 is demagnetized, the oil in the lower chamber of the hydraulic cylinder 29.300 is released to the tank. , the water supply valves 27 and 28 are configured to close due to the fall of their own weight.

Opening these two water supply valves 27 and 28 at the same time results in high-speed pressurization, and opening only one of the water supply valves at some point results in low-speed pressurization.

In this case, if three or more water supply valves are provided, it is also possible to perform medium-speed pressurization.

The present invention has the above configuration, and when the slide 4 is lowered with all the water supply and drainage valves closed,
Manual operation: Place the handle 21 in the lowered position, open the drain valve 16 by rotating the cam plate 19a driven by the motor 22, and return the pressurized water in chamber A on the return side of the cylinder 2 to the tank. , the slide 4 descends due to its own weight.

Next, when the slide 4 comes into contact with the material and has finished falling under its own weight, the manually operated bundle 21 is placed in the pressurized position, and the water supply valve 14 is placed in the pressurized position.
At the same time, when the solenoid valves 34 and 35 are excited to open the water supply valves 27 and 28, the pressure water from the accumulator force fed through the pipe 10 flows through the water supply valves 14 and 27.
, 28 to the upper chamber B of the cylinder 2, and the slide 4 is pressurized at full speed.

At this time, the drain valve 16 is in an open state, and the discharge side chamber A of the cylinder 2 is communicated with the tank.

In this full-speed pressurization operation, in order to improve the pressurization stop precision and prevent shocks when stopping, the solenoid valve 34 is demagnetized slightly before the preset pressurization stop position, and the water supply valve 27 is closed to allow low-speed pressurization. When the switching operation is performed and the slide 4 reaches the preset pressurization stop position, the solenoid valve 35 automatically demagnetizes and closes the water supply valve 28, and the accumulator 7
) - La send! A sequence circuit is constructed so that the pressurized water is cut off and the slide 4 automatically stops pressurizing.

Naoko 1 Manual operation bundle 2 for high-speed and low-speed pressurization
1 is preferably set to the pressurized position and returned to the stop position after confirming that the slide 4 has automatically stopped pressurizing.

In addition, when manually stopping the slide 4 during pressurization, the water supply valve 14 will be closed by returning the manual operation bundle 21 to the stop position, so regardless of whether the water supply valves 27 and 28 are opened, the accumulator force is cut off, and the slide 4 stops at the current position.

In this case, it is preferable to leave the drain valve 17 open.

Next, when the manual operation bundle 21 is placed in the raised position, the water supply valve 15 is opened, and the pressurized water fed from the accumulator through the pipe 10 is passed through the pipe 5 through the holes 11 and 12 to the Boo 2 valve 36. Then, a conductive force is applied to the pull-back side chamber A of the cylinder 2, and the pressurized water in the upper chamber B of the cylinder 2 is released to the tank, and the slide 4 is raised by the pressurized water supplied to the chamber A. .

As described above, according to the present invention, it is possible to automatically stop pressurization by simply setting the pressurization stop position in advance without relying on the operator's intuition, and if the weight and temperature of the billet are adequately controlled, It not only improves the pressurization stop precision, but also greatly improves the forging precision of the product and reduces machining costs.

Furthermore, according to the present invention, priority is given to manual operation, so in an emergency it is possible to make the slide perform any desired movement using the manual operation bundle, and furthermore, a power outage during pressurization may cause the motor to stop on the spot. However, the water supply valve 27.2
8 is closed, it is possible to stop the slide without continuing the pressurizing operation and prevent abnormal situations.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a system diagram of the apparatus of the present invention, and FIG. 2 is a diagram showing the relationship between a manually operated noddle and a water supply/drainage valve. 1...Press frame, 2...Double acting cylinder, 3...Piston, 4...Slide, 5, 6, 7゜10... ...Pipe line, 8...
...Cam type operating valve, 9...... Operating valve, 11,1
2, 13, 25, 26... hole, 14-17, 27
, 28... Water supply and drainage valve, 19a to 19d...
・Cam plate, 20a ~2. , Od, 31.32 one song-
Oshiage Rondo, 21...Manual operation bundle, 22
...Curve motor, 29,30...Cylinder 3
3. Song/Pump, 34, 35... Solenoid valve.

Claims (1)

[Claims] 1 The upper chamber of the piston in the cylinder of the hydraulic press, the cam type operation valve operated by the manual operation bundle, and the Q communication pipe system are operated by the vertical movement of the push-up rod of the hydraulic cylinder by opening and closing of the solenoid valve. An operating valve is provided, and when the slide of the hydraulic press reaches a preset pressure stop position, a sequence circuit is provided that closes the operating valve by demagnetizing the solenoid valve and stops the slide. This is an automatic pressurization stop device for a hydraulic press.