JPS5911400B2 - press - Google Patents

Description

[Detailed Description of the Invention] The present invention is characterized in that the pump rams fitted in a plurality of cylinders are mechanically related to each other and driven, and the pump rams fitted in a single separately provided cylinder are driven by the hydraulic oil discharged by the pump. This relates to a press that drives a press ram.

There are two types of presses: mechanical presses and hydraulic presses. Mechanical presses are capable of high-speed, high-cycle machining, but the brakes and clutches are complicated and expensive, and the operating devices of these machines generate a lot of noise. In addition, it requires the labor of many dogs to manage and maintain it, and it also requires extremely sophisticated safety equipment to prevent overloading, but it often causes wedge-in accidents, which require the time and expense of many dogs to eliminate and repair. It was necessary.

Furthermore, mechanical presses require a stroke adjustment device (lower limit adjustment device), which must be large enough to withstand the full load of the press.

Additionally, mechanical presses require complex linkages to change the stroke time curve.

Hydraulic presses have the ability to produce maximum output over the entire stroke, but they are difficult to operate at high speeds and high cycles, require more power than mechanical presses, and are prone to pump noise and shocks when switching valves. Furthermore, the valve and piping system required a great deal of cost and space.

The present invention aims to eliminate the drawbacks of conventional presses and provide a press that is more efficient and easier to use by combining the characteristic parts of the mechanical press and hydraulic press. I will explain about it.

In the drawing, 1 is a press frame, a pump cylinder 2,
3 and a press cylinder 4 are provided, into which bomb rams 5, 6 and a press ram 7 are fitted, respectively.

The pump ram 5 is driven up and down by a crankshaft 10 which is directly connected to a flywheel 9 which is rotated by a motor 8 via a silicone rod 11. %
It is driven up and down via the conrod 15.

18 is fixed to the press ram 7 by a slide, and is held at the upper limit position by a lifting cylinder 17 that is constantly in communication with the pressure accumulator 16.

The pump cylinders 2 and 3 are electrically connected to each other through oil passages, and are also electrically connected to a tank 22 provided in the crown portion of the sipress frame 1 through oil passages 20 and 21 provided with a check valve 19.

The check valve 19 is operated by pressure oil from the pressure accumulator 16 via the switching valve 23 .

Reference numeral 24 designates an IJ valve provided in the oil passage 20. Reference numeral 25 designates a pump for charging the pressure accumulator 16, and 25 a valve that unloads the pump 32 when the pressure in the pressure accumulator 16 reaches a predetermined level.

In the press configured as described above, the pump rams 5 and 6 are driven up and down by the flywheel 9, but since the check valve 19 is opened by the switching valve 23, the hydraulic oil in the cavity 26 between the pump ram 5 and the press ram 7 is transferred to the tank 22. It just goes back and forth between the two.

When the solenoid 21 of the switching valve 23 is energized by a downward push button (not shown) on the operation panel, etc., the check valve 19 closes the oil passages 20 and 21.
Since the gap is closed, the press ram 7 is pushed down via the hydraulic oil in the cavity 26.

Here, a protrusion 28 is provided on the flywheel 9 or a rotating body directly connected to the flywheel 9 to kick the limit switch 29 before the pump ram 5 reaches the upper limit, and when the down push button is pressed, the limit switch 29 is kicked and the solenoid 2 When this is activated, the check valve 19 is reliably closed and the press ram 7 is reliably moved up and down by a constant stroke.

When the output exceeds the specified value during pressurization, the IJ valve 24 releases the hydraulic oil in the circuit 20, so there is no risk of overload.

When the press is operated continuously, it is operated with the check valve 19 closed, and when the operation is stopped or operated for one cycle, a second limit switch 30 is provided to demagnetize the solenoid 27, and this is set so that the pump ram 5 is raised. While doing so, let the protrusion 28 kick it.

The upper limit of the slide 18 is defined by a stopper 31,
Since the lower limit position is inevitably determined, this stopper 3
The lower limit position can be easily adjusted by adjusting the height of 1 using, for example, a screw shaft, a screwdriver, etc.

Also, since this stopper 31 only receives the lifting output of the lifting cylinder 17, it is extremely small compared to the lower limit adjustment device in a conventional mechanical press.

In the present invention, by changing the cycles of the pumps 5 and 6, various cycle diagrams can be drawn on the press ram 1 (slide 18).

For example, if the tooth ratio of gears 12 and 13 is set to 2:1, the pump ram 6 will have twice as many cycles as the pump ram 5, and the combined cycle diagrams will be shown in FIGS. 2 and 3.

In both figures, the diameter and stroke of pump ram 6 is half that of pump ram 7.

Here, A is the pump ram 5, B is the pump ram 6. C is a cycle diagram in the case of synthesis.

In FIG. 2, the two are adjusted so that they match at the upper limit, and it is suitable for drawing, etc., and it can be seen that the drawing time becomes longer at the drawing depth H.

Furthermore, in FIG. 2, line D indicates that the press ram 1 is activated by opening the check valve 19 a short time after the pump ram 5 begins to rise.
(Slide 18) shows that it rises rapidly and stops at the upper limit.

This makes it possible to take out the molded product quickly and to gain time to prepare for the next process.

Figure 3 is a diagram shifted 90 degrees from Figure 2 so that the upper limit of pump ram 5 and the lower limit of pump ram 6 match. Since the mold can be formed quickly, it can be used particularly for hot forging to better demonstrate its characteristics.

In the present invention, the pump ram and the press ram can be connected at right angles or by a pipe line, and the pump rams are not limited to being connected in parallel.

As described above, the present invention is a press that drives a plurality of pump rams in a mechanically related manner and drives a press ram equipped with a slide through the hydraulic oil removed by these pump rams, and is suitable for high-speed, high-cycle operation. It is possible to operate,
The drive system is equipped with a flywheel, so the motor power is small, and the drive is direct drive, so a clutch,
It does not require a brake, and its operation circuit is not required, making it easy to maintain and manage, reducing noise, and equipped with a relief valve, making it extremely safe with no risk of overload. It's press.

Furthermore, by operating a plurality of pump rams with phase differences, various cycle diagrams can be drawn, so it can be used in a wide range of molding operations.

[Brief Description of the Drawings] The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view;
FIGS. 2 and 3 are cycle diagrams. 1 is a press frame, 2.3 is a pump cylinder, 4 is a ram cylinder, 5 and 6 are pump rams, 1 is a press ram, 9
is a flywheel. 12 and 13 are gears, 17 is a lifting cylinder, 18 is a slurry, 19 is a check valve, 22 is a tank, 23 is a switching lift, 24 is a relief valve, 26 is a cavity, and 31 is a stopper.

Claims (1)

[Claims] 1. A plurality of pump cylinders provided on a press frame, a plurality of pump rams fitted into the pump cylinders, a drive device that reciprocates the pump rams in a mechanical relationship with each other, and operations eliminated by the pump rams. A cavity for merging oil, a single press cylinder that communicates with the cavity, a press ram provided within the press cylinder, a slide attached to the press ram, and a support device that returns and holds the slide at its upper limit position. and a check valve operated by an external force provided in an oil passage communicating between the cavity and the tank.