JPH0224491Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatically non-adjustable dictation device for a press.

Conventionally, the pressure of compressed air supplied to the dictation device of a press is adjusted because the dictation capacity of the dictation device of a press must be changed depending on the product to be processed by the press. However, the dictation device is connected to a large tank through a thick pipe in order to minimize changes in the air pressure in the cushion cylinder during press working. Therefore, when adjusting the pressure, it is necessary to supply or discharge a large amount of air since the air pressure of the cushion cylinder is adjusted using a large tank. In presses used for high-mix, low-volume production, air pressure must be adjusted frequently, and supplying and discharging large amounts of air is a huge waste of time and materials.

The purpose of the present invention is to eliminate this drawback by providing a small cylinder device on the upper mold side facing the dictation device, and by adjusting the air pressure of this cylinder device, it is possible to eliminate the need for adjusting the air pressure of the dictation device. The purpose of the present invention is to provide a dictation device that does not require pneumatic adjustment. Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a conventional dictation device is provided below the bolster 1 of the press.
That is, the cushion cylinder 2 has a piston 3.
is fitted, a cushion pad 4 is supported on the piston rod, a cushion pin 5 for urging the lower mold 6 upward passes through the bolster 1, the upper end surface is in contact with the lower surface of the lower mold 6, and the lower end surface is supported by the cushion pad 4. It is placed in contact with the top surface of the An upper die 8 is mounted on the lower surface of the slide 7 of the press, facing the lower die 6.

A required number of cylinder devices 9 are provided on the lower surface of the slide 7 on the outer periphery of the upper mold 8, and the piston rods 10 of the cylinder devices 9 face the upper surface of the peripheral portion of the lower mold 6. The distance h between the lower surface of the piston rod 10 of the cylinder device 9 and the upper surface of the peripheral portion of the lower mold 6 which is biased and supported by the cushion pin 5 is slightly smaller than the distance between the upper mold 8 and the lower mold 6. Compressed air having a constant pressure is supplied to a cylinder chamber below the piston 3 of the cushion cylinder 2, and is connected to an air tank (not shown) through a thick pipe.

Further, high pressure gas is supplied to the cylinder device 9 to urge the piston rod 10 downward. A cylinder device 9 filled with high-pressure gas having a pressure unique to each mold used is prepared, and when the mold is replaced, the cylinder device 9 is replaced with a cylinder device 9 unique to the mold. Alternatively, the pressure of the high pressure gas can be adjusted. Supply pressure oil instead of high pressure gas or use cylinder device 9
It is also possible to use a urethane rubber block instead.

Next, we will discuss the effect. In FIGS. 1 and 2, when the slide 7 descends from the top dead center (FIG. 1) to press the workpiece 11, the lower surface of the piston rod 10 first comes into contact with the upper surface of the peripheral part of the lower mold 6. , piston rod 1 with cylinder device 9
A downward biasing force of 0 acts on the lower mold 6. Lower mold 6
The upward biasing force of the piston 3 by the cushion cylinder 2 acts through the cushion pin 5 and the cushion pad 4.

For example, if the upward biasing force by the cushion pin 5, that is, the dictation capacity is 30 tons, and the downward biasing force by the piston rod 10 and the high-pressure gas cylinder capacity is 10 tons, then the wrinkle pressing force [=
(Diction capacity) - (High pressure gas cylinder capacity)] is 20 tons. Next, the upper die 8 is the workpiece 1
When the workpiece 11 is pressed onto the lower mold 6, the pressing operation continues while the workpiece 11 is pressed with a wrinkle pressing force of 20 tons. Piston rod 10 is cushion pin 5
When the force is applied to -h- (thickness of workpiece)
The stroke length of the cylinder device 9 needs to be longer than that. The slide 7 reaches the state shown in FIG. 2 at the bottom dead center, and the pressing process is completed.

When replacing the mold, either replace it with a cylinder device unique to the mold prepared according to the required wrinkle pressing force of the mold, or adjust the pressure of the high pressure gas supplied to the cylinder device 9. Bye.

In this case, the cylinder device 9 is small and easy to replace or adjust the gas pressure, and the length that the piston rod 10 will retreat into the cylinder device 9 can be known in advance, so take this into account. It is possible to determine the urging force of the piston rod 10, and the cushioning ability acting on the mold can be made accurate. In this way, the dictation capacity can be kept constant at 30 tons, so there is no need to adjust the pressure of the air supplied to the cushion cylinder 2. In the case of urethane rubber, the diameter and thickness can be adjusted.

As is clear from the above explanation, according to the present invention, the air pressure of the cushion cylinder can be left unadjusted, and the cylinder device installed on the slide can be replaced, or the pressure of the high-pressure gas in the cylinder device can be adjusted. It is possible to handle a wide variety of molds just by adjusting the mold, and the mold change time is easy.Adjusting the pressure of high-pressure gas is easy, and there is no need to waste large amounts of air and time as with conventional cushion cylinders. The practical effects and advantages are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a front view of the main part of the press in cross section, and FIG. 2 is an explanatory view of the operation of the press at the bottom dead center of the slide. 1 is a bolster, 2 is a cushion cylinder, 3 is a piston, 4 is a cushion pad, 5 is a cushion pin, 6 is a lower die, 7 is a slide, 8 is an upper die, 9
1 is a cylinder device, 10 is a piston rod, and 11 is a workpiece.

Claims (1)

[Scope of Claim for Utility Model Registration] In a press dictation device, the device is installed in the bed of the press, and compressed air at a constant pressure is supplied to the cushion cylinder 2 to generate a constant upward biasing force on the cushion pad 4. a dictation device; and an upper mold 8 facing the lower mold 6 portion which is urged upward by the cushion pad 4 of the dictation device.
By adjusting the fluid pressure supplied to the small cylinder in advance according to the molds 6 and 8, the downward biasing force of the piston rod 10 is set, and the biasing force of the cushion pad 4 and the biasing force of the cushion pad 4 are set. A cylinder device 9 that matches the difference between the biasing force of the piston rod 10 and the dictation capacity corresponding to the molds 6 and 8.