JPS5844921A - Pressure control apparatus in pressure chamber for fluid mechanical drawing process - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure control device for a pressure chamber in a fluid-mechanical drawing process, and more particularly to a fluid pressure control device for a pressure chamber filled with a fluid that serves as a drawing die for a workpiece. .

BACKGROUND OF THE INVENTION Conventional machines for hydromechanical drawing, particularly for deep drawing of sheet metal parts, have an advantage over conventional multi-sheet metal machines because they allow complex shapes to be formed. Fluid-mechanical 111! The D-processing device can perform press forming into a desired shape in one stroke, and the thin metal plate does not slide on the edge of the drawing die, but is continuously pushed down by the fluid pressure inside the drawing die. Therefore, the finished surface is extremely beautiful.

Despite the above advantages, the high consumption of power energy and the fact that most of the fluidic elements of the nuclear device operate under high pressure require a special configuration of the fluidic elements. There are many problems with this method. Therefore, the productivity and versatility of the device are limited, and the parts lack compatibility.

Another disadvantage of fluid mechanical divisor processing equipment is that the pressure chamber is usually filled with an icy emulsion, which has poor lubricity and is aggressively corrosive, so it is difficult to control the pressure inside the pressure chamber. The above drawbacks, which had a negative impact on the service life of the fluid elements in the device, could be solved by introducing a pressure chamber with at least two fluid containing spaces separated from each other by at least one piston converter. With this construction, one space directly below the area to be drawn is subject to high pressure and other undesirable effects of the icy emulsion, while the other spaces remain completely clean at all times. Operated at extremely low pressures = thus can be connected to a hydraulic drive circuit via commonly used standard hydraulic components This device significantly reduces the energy consumption of hydraulic presses I can point.

The disadvantage of the above-mentioned fluid mechanical drawing device equipped with a pressure chamber is that the pressure chamber and the piston converter are integrated into a d-J type.
This is true. This integral member is long compared to conventional pressure chambers, thus limiting the effective stroke of the operating range of the fluid pre-winter throttle. Another disadvantage is that the above pressure chamber is difficult to assemble, and it is difficult to effectively capture chips that have separated from the material during winter drawing and collect them in the fluid space of the pressure chamber above the piston of the piston converter. It's impossible. Another disadvantage is that the outer shape of the pressure chamber limits the amount of fluid above the piston, thereby limiting the possible range of press working. This necessitates replacing the entire pressure chamber, including the expensive piston converter.

The above-mentioned disadvantages can in principle be eliminated by a converter arrangement in which at least one piston converter is provided in the hydraulic cylinder. The converter device connects a small diameter piston converter to the space of the pressure chamber and comprises an inlet for the working fluid on the opposite side of the piston converter. Since at least one piston converter is provided outside the pressure chamber main body, the pressure chamber can be arbitrarily replaced according to the dimensions of the press work without changing the original device. Therefore, the converter device is configured as an independent unit. In addition, the symptoms can be controlled by an appropriate combination of logical control elements or valves, and the pressure in the pressure chamber can be controlled according to the desired drawing method.

However, even with the use of converter systems with at least four piston converters, certain disadvantages still remain. That is, since the conversion ratio of the converter device is constant, the pressure within the pressure chamber cannot be controlled over a wide range. Such a wide range of controls is necessary because stamping operations can sometimes vary significantly.

According to the present invention, at least one pair of piston units having piston rods are provided, and the respective piston rods are mutually connected via a two-armed lever having a longitudinally adjustable pivot shaft. connecting one piston unit to the space of the pressure chamber and removing the outlet of the other piston unit via at least one four-way valve to the main space of the working cylinder of the hydraulic press by means of a connected pressure control device; be able to.

An object of the present invention is to improve the energy balance of a fluid pressure press by widening the pressure control range within the pressure chamber according to the shape of press working.

Further objects and advantages of the invention will become apparent from the following description of the embodiments taken in conjunction with the accompanying drawings.

An example in which the device of the present invention is applied to a hydraulic press will be explained. ◎Hydraulic press #i 2 with a drawing slide 3 attached
A working cylinder 1 with a heavy working piston 2 is provided. A punch 4 is attached to the slide 3, and the punch plunges into a pressure chamber 5 filled with a fluid, especially an ice-like emulsion, for press operation. A material plate 6 to be pressed is placed on the upper edge of the pressure chamber 5 and held by a material holder (not shown).

The working cylinder 1 of the hydraulic press is connected via a supply pipe 7.8 and a main distributor 9 to a hydraulic pressure generator 10.

Since the pressure chamber 5 is connected to the space within the first piston unit 11, the working fluid of this first piston unit 11 is an icy emulsion. Since high pressure is applied to the piston 12 of the first piston unit 11, it is preferable that the diameter of the piston 12 of the piston 13 of the second piston unit 14 is also made small.

Part 2 The working fluid in the piston unit 14 is the fluid used in the circuit of the working cylinder 1 of the hydraulic press, that is, oil.

The outlet 15 of the second piston unit 14 is connected via at least one feed valve 16 to the main space of the working cylinder 1 of the hydraulic press either directly or via a supply line 7f.

The connection between the piston units 11 and 14 can also be implemented with other transmissions (not shown) with various transmission ratios, such as wedge-type transmissions or gear-type transmissions.

The operation of the device of the present invention will be explained below. When drawing of the blank plate 6 is started, the pressure of the ice emulsion in the pressure chamber 5 increases.

This pressure needs to be maintained at a certain level, but the level changes depending on the type of press processing. Now, when the high-pressure ice-like emulsion is led to the first piston unit 11, the piston rod 17 is pressed, and the force is applied to the piston rod 18 of the second piston/unit 14 by the pivotable two-arm lever 19. do. That is, due to the difference in the transmission ratio of the two-arm lever 19 and the diameters of the pistons /12 and 13,
The oil pressure in the piston/14 is higher than the oil pressure generated by the fluid pressure generator, and the oil enters the working cylinder l of the hydraulic press through the t4 valve 16 to support the pressing action in the press process φ.

By adjusting the position of the pivot shaft 20 of the rotatable two-armed lever 19, the pressure difference at the outlet 15 of the second vist unit 14 can be controlled. A sliding member 22 that supports the pivot shaft 20 of the lever by using the adjuster 23 once.
in the direction of the arrow, and also press the pressure sensor 24. ,25f
Through this, the oil pressure at the outlet 15 can be changed during pressing depending on the type of pressing.

[Brief explanation of the drawing]

1 is a schematic diagram illustrating an embodiment of the present invention. 1... Cylinder for 1β, 5... Pressure chamber, 11...
1st piston unit, 12.13... Piston, 1
4...Second piston unit, 15...Outlet, 16
...J & valve, 17, 18...piston rod, 1
9...Two-arm lever, 20...Pivot shaft, 22...
Sliding member, 23...Adjuster, 24.25...Pressure sensor, continued from the first page in the margin 0 Inventor Parklav Smrcek Brno Bednarova, Czechoslovakia 26 Procedural amendment (method) % formula % 1. Indication of the case 1981 Patent Application No. 101528 2. Name of the invention Pressure control device in a pressure chamber for fluid mechanical drawing 3. Person making the amendment Relationship to the case Patent applicant name Tovarny Stroierensky Techni Ki Concern 4. Agent (3 others) 5. Date of amendment order September 28, 1932 (shipment date) 6. Drawings subject to amendment 7. Contents of amendment: engraving of the drawing (no change in content) 8. , 1 engraving drawing of attached documents

Claims (1)

[Claims] 1. Pressure control in the pressure chamber for fluid mechanical multiple processing of a fluid pressure press! ! In a device in which the pressure chamber is filled with a fluid constituting a multi-throttle die, the device has at least a pair of first and second piston units (11°, 14) having piston rods (17, 18). ), the respective piston rods (17° 18) are connected to each other via a two-armed lever (19) having a longitudinally adjustable pivot shaft (20), and the first piston unit (11) is connected to the air HUj of the pressure chamber (5), and the outlet (15> of the second piston unit (14) is connected to the working cylinder of the hydraulic press via at least one defect recovery valve (16). (l
) A pressure control device in a pressure chamber for fluid mechanical drawing processing, characterized in that it is connected to the main space of a. 2. Pivot shaft (20) of rotatable two-arm lever (19)
T-adjuster (23) (2) sliding member (22) K connected,
Claim 1, wherein the inlet of the regulator (23) is connected to the pressure sensor (25) of the pressure chamber (5) and the pressure sensor (24) K of the main space of the working cylinder (1) of the hydraulic press, respectively. Apparatus described in section. 36 The piston unit (11, 14) is equipped with pistons (12, 13) of different diameters, and the piston unit (11, 14) has a small diameter piston (1
2) a piston unit (11) having a pressure chamber (5)
A device according to claim 1, connected to. 4. The device according to claim 1, wherein a wedge-shaped transmission is disposed between the pair of piston units (11, 14).