KR20020076943A - Dual hydroforming system - Google Patents

Abstract

PURPOSE: A dual hydroforming system is provided which not only obtains hydroforming effect even in a pressing direction of a punch, but also removes frictional force between the punch and a plate by installing a hydroforming means at the side of the punch pressing the plate. CONSTITUTION: In a dual hydroforming system comprising a chamber(110) the upper part of which is opened so that a fluid(150) is filled in the chamber(110), a die(120) mounted on the upper part of the chamber(110), a blank holder(130) for fixing a plate(200) that is put on the die(120), and a punch(140) for pressing the plate(200) through the blank holder(130), the dual hydroforming system is characterized in that the hydroforming means(10) comprising a pressure die(11) consisting of a certain fluid chamber(14) between the plate(200) fixed between the die(120) and the blank holder(130) and the pressure die(11), and a pressure valve(111) which is connected to a fluid tank and flows the fluid(150) into or discharges the fluid(150) out from the fluid chamber(14) is installed at the upper part of the blank holder(130), wherein the pressure valve(111) of the hydroforming means(10) supplies the fluid(150) into the fluid chamber(14) before the punch(140) presses the plate(200) and discharges the fluid(150) from the fluid chamber(14) as the plate(200) is being pressed by the punch(140).

Description

Dual hydroforming system

The present invention relates to a dual hydroforming apparatus, and more particularly, to a dual hydroforming apparatus configured to separately configure the hydroforming means on the punch side to obtain a reduction in frictional force and a static pressure effect generated between the plate and the punch. will be.

In general, a hydroforming method is widely used as a special processing method using a static pressure of a fluid among various methods of processing a plate.

The hydroforming method uses a hydroforming apparatus as shown in FIG. 2. The hydroforming apparatus 100 pressurizes the chamber 110 in which the liquid is filled in a predetermined amount therein, the die 120 mounted on the chamber 110, and the plate 200 placed on the die. The main body consists of a blank holder 130 and a punch 140 for pressing the plate 200 through the blank holder 130.

In particular, the chamber 110 is provided with a pressure valve 111 so that the fluid 150 filled therein can be discharged to the outside, the chamber generated by the pressing force of the punch 140 through the pressure valve 111 110 to adjust the fluid pressure inside.

The hydroforming apparatus 100 formed as described above fills the chamber 110 with a predetermined amount of fluid, places the plate 200 on the die 120, and stacks and fixes the blank holder 130 thereon to punch 140. By pressing the plate 200 to form a desired product.

At this time, the fluid pressure in the chamber 110 is gradually increased by the pressing force of the punch 140. The static pressure of the fluid causes the plate 200 to deform similarly to the shape of the punch 140, and this fluid When the pressure of a certain degree or more is a part of the fluid is discharged through the pressure valve 111 under the control of the controller not shown to obtain a finished product of the desired form.

However, in the conventional hydroforming apparatus 100, since the pressing force is applied directly to the plate by the punch 140, as in general press processing, friction is generated between the plate 200 and the punch 140, and improvement of this is necessary. Was done.

As a method for improving this, there is a method of supplying oil between the plate 200 and the punch 140, but in the case of the high tension plate 200, which is difficult to change the shape, the pressing force of the punch 140 is increased, so that the punch 140 A sufficient oil supply is not made between the plate and the plate 200, and plastic deformation occurs locally on the plate 200 which comes into contact with the punch 140 first, thereby requiring improvement.

The present invention has been devised in view of the above, and is provided with a hydroforming means on the punch side to apply pressure to the plate, not only to obtain a hydroforming effect in the direction of pressing with the punch, but also to improve friction between the punch and the plate. Its purpose is to provide a dual hydroforming device that can be eliminated.

1 is a cross-sectional view showing a dual hydroforming apparatus according to the present invention,

2 is a cross-sectional view showing a conventional hydroforming device.

[Description of Symbols for Main Parts of Drawing]

10 hydroforming means 11 pressure die

12 fluid valve 13 operating hole

14 fluid chamber 100 hydroforming device

110: chamber 111: pressure valve

120: die 130: blank holder

140: Punch 150: Fluid

200: plate

The present invention for realizing this is a chamber in which an upper portion is opened to fill a fluid, a die mounted on an upper portion of the chamber, a blank holder for fixing a plate placed on an upper portion of the die, and the plate material through the blank holder. A dual hydroforming apparatus comprising a punch for pressing a pressure die, wherein the blank holder has a pressure die constituting a constant fluid chamber between a die and a plate fixed between the blank holder, and a fluid chamber connected to the fluid tank. Characterized in that the hydroforming means including a pressure valve for introducing or discharging the fluid.

In a preferred embodiment of the invention, the pressure valve of the hydroforming means is characterized in that to provide a fluid to the fluid chamber before the punch presses the plate, and to discharge the fluid from the fluid chamber as the punch presses the plate. .

Hereinafter, with reference to the accompanying drawings, the configuration and effect of the present invention will be described.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a dual hydroforming apparatus according to the present invention, and the same reference numerals are used for the same components as in the prior art.

The present invention constitutes a separate hydroforming means 10 in a conventional hydroforming device, so that the punch 140 presses the plate 200 to the hydroforming effect and the friction reducing effect as well as the positive pressure effect. To get them at the same time.

Here, the hydroforming means 10 is installed on the side on which the punch 140 is mounted, and constitutes a fluid chamber 14, and the fluid from the fluid chamber 14 to the outside of the dual hydroforming device. It consists of a fluid valve 12 for discharging the furnace.

The pressure die 11 is a kind of block installed in the upper portion of the conventional chamber 110, and an operating hole 13 is formed at the center thereof so that the punch 140 can be operated up and down, and in particular, the operating hole 12. The silver inner circumferential surface is precisely processed so that fluid leakage does not occur between the punch 140.

The pressure die 11 formed as described above is used by being mounted on the blank holder 130, and constitutes a fluid chamber 14 having a predetermined size between the plate 200.

That is, the plate 200 is placed on the die 120 fixed to the top of the chamber 110 filled with a predetermined amount of fluid 150 to form the plate 200 through the dual hydroforming apparatus, and then blanked thereon. The holder 130 is mounted. In the present invention, the pressure die 11 is mounted on the blank holder 130 to fill the liquid in the operating region in which the punch 140 is operated up and down as the fluid chamber 14. Will be used.

The fluid chamber 14 formed as described above is provided with a fluid chamber 12 to discharge the fluid to the outside. In the accompanying drawings, an example mounted between the pressure die 11 and the blank holder 130 is shown. Is showing.

The fluid valve 12 is selectively opened and closed under the control of a not shown controller, and is connected to an unshown fluid tank installed outside the dual hydroforming apparatus 100 according to the present invention.

In a preferred embodiment of the present invention, the fluid valve 12 is preferably configured to be selectively opened and closed under the control of a controller using a check valve function, one connected to the fluid tank to fluidize the fluid. It is preferably used to supply the chamber 14 and the other to drain the fluid from the fluid chamber 14.

The fluid valve 12 configured as described above is opened when the punch 140 is operated and is supplied with the fluid 150 from the fluid tank to be filled in the fluid chamber 14, and in contrast, when the punch 140 is in operation. The fluid 150 is discharged from the fluid chamber 14.

Accordingly, the punch 140 is always present with the fluid 150 between the plate 200, in particular the fluid 150 has a hydroforming effect, such as oil filled in the chamber 110, as well as function as the oil. Will be mine.

As described above, the present invention is provided with a separate hydroforming means on the punch side of the conventional hydroforming apparatus, thereby obtaining the following effects by obtaining a hydroforming effect on the upper and lower parts based on the plate during the punching action. .

1) Since the punch does not directly contact the plate, it is possible to eliminate local plastic deformation caused by the friction with the punch.

2) It is possible to improve the productability by increasing the forming force of the plate by the pressing force of the punch and the static pressure of the hydroforming means.

3) It eliminates the use of oil to eliminate the friction between the punch and the plate and at the same time achieves the hydroforming effect.

Claims (2)

A chamber in which the upper part is opened to fill the fluid, a die mounted on the upper part of the chamber, a blank holder for fixing the plate placed on the die, and a punch for pressing the plate through the blank holder. In the dual hydroforming device, Hydroforming means on the blank holder comprises a pressure die constituting a constant fluid chamber between the die and the plate fixed between the blank holder, and a pressure valve connected to the fluid tank for introducing or discharging fluid into the fluid chamber Dual hydroforming device, characterized in that the provided. The dual hydro of claim 1, wherein the pressure valve of the hydroforming means provides the fluid to the fluid chamber before the punch presses the plate and discharges the fluid from the fluid chamber as the punch presses the plate. Forming device.