KR20090003858A - Punch pressing device - Google Patents

Abstract

A punch press apparatus is provided to improve forming quality of the panel product by controlling supply of a predetermined pneumatic pressure and a hydraulic pressure set up at the same time as the pneumatic pressure in stages, thereby stably delivering cushion pressure to the panel product during forming of a panel product, and to reduce the forming modification cost by skipping the forming modification process. A punch press apparatus comprises a bolster(115) on which a lower mold punch(112) having a shape of the bottom face of a panel product(116) is mounted; blank holders(113) mounted on the bolster through cushion pins(117) at the outer side of the lower mold punch; an upper slider(114) which is installed above the lower mold punch, and on which an upper mold die(111) having a shape of the top face of the panel product is mounted; a pin lifter(118) on which the cushion pins are fixedly mounted; a cushion pad(119) mounted on the bottom part of the pin lifter; a pneumatic pressure supply unit installed on the bottom part of the cushion pad to provide the cushion pad with a pneumatic pressure for lifting or lowering the cushion pad; and a hydraulic pressure supply unit installed on the bottom part of the cushion pad to provide the cushion pad with a hydraulic pressure for lifting or lowering the cushion pad.

Description

Punch pressing device

1 is a block diagram showing a pneumatic punch press device according to the prior art

Figure 2 is a first operating state of the pneumatic punch press device according to the prior art

Figure 3 is a second operating state of the pneumatic punch press device according to the prior art

Figure 4 is a block diagram showing a hydraulic punch press device according to the prior art

Figure 5 is a first operating state of the hydraulic punch press device according to the prior art

Figure 6 is a second operating state of the hydraulic punch press device according to the prior art

7 is a block diagram showing a punch press device according to the present invention

Figure 8 is a first operating state of the punch press device according to the present invention

9 is a second operation state of the punch press device according to the present invention

10 is a third operation state of the punch press device according to the present invention

11 is a fourth operation state diagram of the punch press device according to the present invention

12 is a fifth operation state diagram of the punch press device according to the present invention

13 is a sixth operation state of the punch press device according to the present invention

14 is a flow chart showing a forming process of the punch press device according to the present invention.

Explanation of symbols on the main parts of the drawings

120: pneumatic cylinder 121: hydraulic cylinder

122: butterfly valve 123: servo valve

124: air tank 125: oil tank

126: first logic valve 127: second logic valve

The present invention relates to a punch press device, and more particularly, by supplying and controlling the hydraulic pressure set at the same time as the pneumatic constant pressure step by step to stably transfer the cushion pressure during molding to improve the molding quality, molding modification is unnecessary It relates to a punch press device that can reduce the molding modification cost.

In general, until the automobile manufacturer produces a single car, the panel parts of 1000 to 1500 parts (PART) are made through several processes, production, and assembly processes.

In particular, the car body is the first step in the automobile manufacturing process, after producing a product panel through a variety of press devices, each part of the product panel is assembled in the body factory to form a white body (B.I.W) body.

In order to form the material panel into the product panel as described above, an average four steps of press forming processes including a draw molding process, trimming and piercing molding process, cutting and piercing molding process, and flanging and piercing molding process are performed. Is the process of plastic processing the material according to the product data, which is the main process to determine the quality of panel parts more than 90%.

Hereinafter, a general punch press apparatus applied to a draw molding process will be described with reference to the accompanying drawings.

First, the pneumatic punch press device applied to the mechanical press, as shown in Figure 1, the lower die punch (2) is equipped with a lower punch (2) having a lower surface shape of the product panel 6, the lower punch An upper die having a blank holder 3 mounted on the bolster 5 through a cushion pin 7 on the outside of the lower part 2 and an upper surface shape of the product panel 6 on an upper portion of the lower die punch 2. The upper slider (4) to which (1) is mounted, a pin lifter (8) to which the cushion pin (7) is fixed, a cushion pad (9) to be mounted to the bottom of the pin lifter (8), and the cushion Pneumatic cylinder 10 for raising and lowering the pad 9, an air tank 12 for supplying air to the pneumatic cylinder 10, and is supplied to the pneumatic cylinder 10 from the air tank 12 It is configured to include a solenoid valve 11 for controlling the air.

Pneumatic punch press device configured as described above is a device for generating a cushion pressure of the desired molding force by operating the pneumatic cylinder 10 by a solenoid valve 11 connected to the air tank 12 to control the flow of air. .

Referring to FIG. 1, the pneumatic cylinder 10 raises the cushion pad 9 and the pin lifter 8 by a cushion stroke (lift amount) at an angle of 0 degrees of the upper slide 4, that is, before the operation. Regardless of the depth, the blank holder 3 is lifted so that the panel 6 can be seated without sagging.

2, when the blank slide 3 is held while the upper slide 4 is lowered, cushion pressure caused by pneumatic pressure is applied from this point. As shown in FIG. Molding is complete.

However, in the pneumatic punch press apparatus, since the pneumatic pressure is temporarily applied at a time, the force applied during molding increases, so that it does not satisfy the desired molding conditions, and wrinkles and bursts during holding and bending remain on the finished panel, thereby repeatedly performing work for molding modification. There was a problem to be carried out.

Next, as shown in FIG. 4, the hydraulic punch press apparatus includes a bolster 5 equipped with a lower die punch 2 having a lower surface shape of the product panel 6, and a lower punch 2 of the lower die punch 2. A blank holder 3 mounted to the bolster 5 via a cushion pin 7 to the outside and an upper die 1 having a top surface shape of the product panel 6 at an upper portion of the lower die punch 2 are provided. A mounted upper slider 4, a pin lifter 8 to which the cushion pin 7 is mounted and fixed, a cushion pad 9 mounted below the pin lifter 8, and the cushion pad 9 Hydraulic cylinder 10 for raising and lowering the oil, the oil tank 12 for supplying oil to the hydraulic cylinder 10, and the oil to control the oil supplied to the hydraulic cylinder 10 from the oil tank 12 The servo valve 11 is comprised.

The hydraulic punch press device configured as described above is an apparatus for generating a cushion pressure of a desired molding force by operating the hydraulic cylinder 10 by the servo valve 11 connected to the oil tank 12 to control the flow rate of oil. to be.

Referring to FIG. 4, in the zero degree angle of the upper slider 4, that is, in the pre-operation state, the hydraulic cylinder raises the cushion pad 9 and the pin lifter 8 by the cushion stroke (lift amount) and increases the molding depth. Regardless, the blank holder 3 is lifted so that the panel 6 can be seated without sagging.

Then, referring to FIG. 5, when the upper slider 4 is lowered and the blank holder 3 is held, cushion pressure by hydraulic pressure is applied from this time point, and as shown in FIG. 6, the panel 6 reaches the post-operation state. Molding is complete.

However, the hydraulic punch press device can be controlled to achieve a stable molding compared to the mechanical punch press, but the TRY-OUT speed is slow and the quality conditions of the panel 6 (domestic and export, manufacturers, etc.) Due to this difference, the cushion pressure according to the molding conditions cannot be controlled differently, so that only one-way operation of the equipment is possible.

The present invention is to solve the above-mentioned problems, by supplying a step-by-step control of the hydraulic pressure set at the same time as a constant pressure, it is possible to stably transfer the cushion pressure during molding to improve the molding quality, molding modification is unnecessary It is an object of the present invention to provide a punch press apparatus that can reduce the modification cost.

According to one aspect of the present invention for achieving the above object, a lower die punch having a lower surface shape of a product panel is mounted to a lower bolster, and a blank holder through a cushion pin on the bolster to the outside of the lower die punch. In the punch press apparatus is mounted, the upper die having a top surface shape of the product panel at the top of the lower die punch is mounted on the slider of the upper press the panel which is injected between the lower die punch to form the product panel, Pneumatic supply means for providing pneumatic pressure to the blank holder mounted through the cushion pin; And it provides a punch press device characterized in that it comprises a hydraulic supply means for providing hydraulic pressure to the blank holder mounted through the cushion pin.

The pneumatic pressure of the pneumatic supply means and the hydraulic pressure of the hydraulic supply means are provided to the blank holder via a pin lifter for supporting and lowering the cushion pin and a cushion pad installed below the pin lifter to raise and lower the pin lifter. It is characterized by being provided.

The pneumatic supply means is characterized by comprising a pneumatic cylinder, an air tank for supplying air to the pneumatic cylinder, and a butterfly valve for controlling the air supplied from the air tank to the pneumatic cylinder.

The hydraulic supply means comprises a hydraulic cylinder, an oil tank for supplying oil to the hydraulic cylinder, a servo valve for controlling oil supplied from the oil tank to the hydraulic cylinder, and first and second logic valves. It is done.

The pneumatic pressure provided to the blank holder by the pneumatic supply means is constantly supplied, and the hydraulic pressure provided to the blank holder by the hydraulic pressure supply means is supplied step by step.

Hereinafter, a punch press device according to the present invention with reference to the accompanying drawings in more detail as follows.

7 is a block diagram showing a punch press device according to the present invention, Figures 8 to 13 are state diagrams showing the operation of the punch press device according to the present invention, Figure 14 is a molding process of the punch press device according to the present invention The flow chart shown.

As shown in FIG. 7, the punch press apparatus according to the present invention includes a bolster 115 equipped with a lower die punch 112 having a bottom surface shape of a product panel 116, and an outer side of the lower die punch 112. The blank holder 113 mounted on the bolster 115 through the cushion pin 117 and the upper die 111 having the upper surface shape of the product panel 116 on the lower punch 112 are mounted. The upper slider 114, the pin lifter 118 to which the cushion pin 117 is fixed, the cushion pad 119 mounted to the lower portion of the pin lifter 118, and the cushion pad 119 Pneumatic supply means is provided in the lower portion to provide a pneumatic pressure for raising and lowering the cushion pad 119, and is installed in the lower portion of the cushion pad 119 to provide a hydraulic pressure for raising and lowering the cushion pad 119 It comprises a hydraulic supply means.

Here, the pneumatic supply means, the pneumatic cylinder 120 for generating pneumatic pressure in the lower portion of the cushion pad 119, the air tank 124 for supplying air to the pneumatic cylinder 120, and the air tank ( 124 is composed of a butterfly valve 122 for controlling the air supplied to the pneumatic cylinder (120).

The hydraulic pressure supply means includes a hydraulic cylinder 121 for generating hydraulic pressure in the lower portion of the cushion pad 119, an oil tank 125 for supplying oil to the hydraulic cylinder 121, and the oil tank ( And a servo valve 123 and first and second logic valves 126 and 127 for controlling oil supplied from the hydraulic cylinder 121 to the hydraulic cylinder 121.

That is, the punch press device according to the present invention, by supplying the pneumatic pressure to the cushion pad 119 by the pneumatic supply means to ensure that the blank holder 113 has a constant pneumatic cushion pressure, the hydraulic pressure supply By supplying the hydraulic pressure step by step to the cushion pad 119 by means so that the blank holder 113 has a cushion pressure of the hydraulic step by step, the cushion pressure can be transmitted stably to improve the molding quality.

Referring to Figures 8 to 14 the molding process of the punch press device according to the present invention configured as described above in detail as follows.

Punch press apparatus according to the present invention wrinkles and burst due to the molding limit of the material when forming the panel 116 by using a hydraulic, pneumatic cylinder 120 or a hydraulic, pneumatic mixing method, not the individual method by the pneumatic cylinder 120 The purpose is to improve the molding quality by stabilizing the molding quality early, such as by applying a numerical control method of hydraulic pressure.

First, as shown in FIG. 8, when the upper slider 114 starts to operate from the top dead center (slide angle 0 °), a constant pneumatic pressure is applied from the air tank 124 by a butterfly valve 122 that controls the flow of air. And the preset hydraulic pressure starts to cross the pre-acceleration section.

In this case, the hydraulic pressure is adjusted by the first and second logic valves 126 and 127 and the servo valve 123 controlling the flow rates of the upper and lower chambers of the hydraulic cylinder 121 from the oil tank 125.

That is, the mixed cushion pressure is generated by the constant pneumatic pressure and the hydraulic pressure generated during the cushion pressure operation, which raises the cushion pad 119, the pin lifter 118, and the cushion pin 117 of the blank holder 113. It is used as the power to secure the holding force.

9 and 10, the hydraulic pressure controlled by the PLC for each point is gradually depressurized. As shown in FIG. 11, the upper slider 114 becomes the bottom dead center (slide angle 180 °) and the panel 116. ) Is formed.

Until the bottom dead center, the hydraulic pressure can be controlled step by step in a numerical control method within a certain range according to the slide angle, and may not be used depending on the molding limit and the TRY-OUT condition.

After the molding of the panel 116 is completed, the upper slider 114 is a cushion in which the cushion position is controlled lower than the bottom dead center as shown in FIG. 12 to avoid interference between the molded panel 116 and the upper die 111. The upper slider 114 ascends temporarily to the point where the next material can be stably inserted and molded as shown in FIG. 13 to take out the panel 116 through the lock section.

At this time, the upper slider 114 reaches the top dead center to complete the molding cycle for forming the panel 116.

As shown in Fig. 14, the punch press apparatus according to the present invention allows the cushioning method, that is, the molding mode to be selected, so that parts having a low molding depth and no moldability problems (doors, loops, etc.) generally use a machine using pneumatic supply means. The product panel can be molded using the (pneumatic) method, and the molded parts (S / OTR, DEEP DRAW'G) use the numerical control mixing method that uses the pneumatic supply means and the hydraulic supply means at the same time. It can be molded selectively.

The effects of the present invention configured as described above are as follows.

According to the punch press device according to the present invention, the holding force of the blank holder can be freely adjusted to facilitate wrinkles and swelling, to secure the appearance quality, and to shorten the mold development schedule.

In addition, by holding the blank holder by securing a proper cushion pressure in a pneumatic method and a step-by-step controlled hydraulic pressure of the constant pressure it is possible to expand the molding range for preventing wrinkles, bursting, bending of the product panel.

In addition, by setting the mixed cushion pressure according to the slide angle, not the unilateral cushion pressure of hydraulic pressure or pneumatic pressure, it contributes to cost reduction by securing molding quality and minimizing mold modification work when wrinkles and bursts occur. When applied simultaneously to the designed production line main press, productivity can be improved by eliminating the T / O manpower that is put into the quality development through blank holder bedding and further modification during molding TRY-OUT in the production line.

Claims (5)

A lower die punch having a bottom surface shape of the product panel is mounted on the lower bolster, and a blank holder is mounted to the bolster through a cushion pin to the outside of the lower die punch, and an upper surface shape of the product panel is formed on the upper portion of the lower punch. In the punch press apparatus for mounting a product die by pressing the panel which is mounted between the upper die and the lower die punch with a lower die punch, Pneumatic supply means for providing pneumatic pressure to the blank holder mounted through the cushion pin; And And a hydraulic pressure supply means for providing hydraulic pressure to the blank holder mounted through the cushion pin. The method of claim 1, The pneumatic pressure of the pneumatic supply means and the hydraulic pressure of the hydraulic supply means are provided to the blank holder via a pin lifter for supporting and lowering the cushion pin and a cushion pad installed below the pin lifter to raise and lower the pin lifter. Punch press apparatus, characterized in that provided. The method of claim 1, The pneumatic supply means, With pneumatic cylinder, An air tank for supplying air to the pneumatic cylinder, Punch press apparatus, characterized in that consisting of a butterfly valve for controlling the air supplied from the air tank to the pneumatic cylinder. The method of claim 1, The hydraulic supply means, With hydraulic cylinder, An oil tank for supplying oil to the hydraulic cylinder, Punch press apparatus comprising a servo valve and a first, second logic valve for controlling the oil supplied from the oil tank to the hydraulic cylinder. The method of claim 1, The pneumatic pressure provided to the blank holder by the pneumatic supply means is constantly supplied, the hydraulic pressure provided to the blank holder by the hydraulic pressure supply means is supplied in stages.

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