JPH05237564A - Method for simultaneously working bending and punching and device therefor - Google Patents

Abstract

PURPOSE:To simultaneously enable the flange bending of a panel and the punching of a bent flange part without providing an escaping hole for preventing interference with the piercing punch in an upper die. CONSTITUTION:At the end part of the panel 21 pressed to a lower die 32 with a pad 34, the bent flange part is formed with the lowering of the upper die 33, and at the time of lowering the upper die 33, a part of lowering energy of the upper die 33 is stored. By detecting that the upper die 33 ascends up to the prescribed height after forming the bent flange part, the stored energy at the time of lowering the upper die 33 is used to drive the piercing punch 91, and the punching of the bent flange part is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a panel bending process,
The present invention relates to a press working method and apparatus for simultaneously punching a bent flange portion formed by this bending work.

[0002]

2. Description of the Related Art As shown in FIG.
There is a product in which the punched hole 3 is formed in the bending flange portion 2. Conventionally, the pressed product 1 is molded by the press processing apparatus 11 shown in FIG. Hereinafter, the configuration and the forming procedure of the press working apparatus 11 will be described.

The press working apparatus 11 shown in FIG.
2. It has an upper die 13, a pad 14, and a punch punch 15. The upper die 13 is provided with a bending blade 16. The punch punch 15 is attached to a cam mechanism portion 17 that converts vertical movement of the upper die 12 into horizontal movement. The cam mechanism portion 17 is composed of a cam base 18 provided on the upper die 13 side and a working cam 19 provided on the lower die 12 side to which the punch punch 15 is fixed. Is designed to slide horizontally.

[0004] The press working apparatus 11 configured as described above
, The panel 1 is placed on the lower mold 12 and the upper mold 12
The panel 1 is pressed against the lower mold 12 by the pad 14 during the lowering of the. The end of the panel 1 pressed against the lower mold 12 by the pad 14 is molded into the bending flange 2 by the lowering of the upper mold 13. When the bending flange portion 2 is molded,
Further, the cam mechanism portion 17 is driven by the lowering of the upper die 12, and the bending flange portion 2 is driven by the movement of the punch punch 15.
Punching is performed. As a result, the punched hole 3 is formed in the bending flange portion 2.

As described above, the press working apparatus 1 shown in FIG.
In No. 1, the flange bending process and the punching process can be performed at the same time, and the number of molding steps can be reduced.
As an example of a technique for simultaneously performing bending and punching, for example, Japanese Utility Model Laid-Open No. 60-121419 is known.

[0006]

However, in the case of the press working apparatus shown in FIG. 8 and the apparatus disclosed in Japanese Utility Model Laid-Open No. 60-121419, the bending blade 16 of the upper die 13 is prevented from interfering with the punch punch 15. It is necessary to provide a relief hole 20 for prevention. Providing the escape hole 20 in the bending blade 16 causes the strength of the bending blade 16 to be reduced, and the rigidity of the bending blade 16 is insufficient, resulting in a problem that the processing accuracy of the bending flange portion 2 is reduced.

In the present invention, focusing on the above problems, it is possible to perform flange bending and punching of a panel at the same time without providing a relief hole in the upper die for preventing interference with the punching punch. An object is to provide a processing method and an apparatus thereof.

[0008]

[Means for Solving the Problems]

(1) In the simultaneous bending and punching method for this purpose, a bending flange portion is formed by lowering the upper die at the end of the panel pressed by the pad to the lower die, and the lower die is lowered when the upper die is lowered. Part of the energy is accumulated, and by detecting that the upper die has risen to a predetermined height after forming the bending flange portion, the punch punch is driven by using the energy accumulated when the upper die descends. Then, the bending flange portion is punched.

(2) The simultaneous bending and punching apparatus for this purpose compresses the gas by the downward energy of the upper mold for bending the end portion of the panel set in the lower mold, and stores the compressed state of the gas. Means, a height detection means for detecting that the upper die rises to a predetermined height after a bending flange portion is formed on the panel by lowering the upper die, and a detection signal from the height detection means. Thrust generating means for generating thrust by the compressed gas supplied from the pressure accumulating means, a punch punch attached to the thrust generating means and capable of entering the lower die hole adjacent to the bending flange portion of the panel, It is equipped with.

[0010]

In the constructions (1) and (2) described above, the end of the panel is bent by the lowering of the upper mold, and the bent flange portion is formed. Further, when the upper die is lowered, a part of the lowering energy of the upper die is accumulated in the pressure accumulating means. The energy stored in the pressure accumulating means is retained even after the bending flange portion is formed. When the forming of the bending flange is completed, the compressed gas as the energy accumulated in the pressure accumulating means is generated based on the signal from the height detecting means that detects that the upper die has risen to the position where it does not interfere with the punch punch. Supplied to the means.

When the compressed gas is supplied to the thrust generating means,
The punch punch advances toward the die hole of the lower die, and the bending flange portion of the panel is punched by entering the die hole of the punch punch. In this way, when the upper die is raised to a position where it does not interfere with the punch punch, the punch punch is driven, so that it is not necessary to provide a relief hole in the bent portion of the upper die. Therefore, it is possible to increase the rigidity of the bent portion of the upper die and improve the processing accuracy of the bent flange portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the simultaneous bending and punching method and apparatus according to the present invention will be described below with reference to the drawings.

1 to 6 show one embodiment of the present invention, and particularly FIG. 1 shows a press working apparatus using the working method of the present invention. In FIG. 1, reference numeral 31 indicates a press working device. The press machine 31 is a lower mold 3
2. It has an upper die 33 and a pad 34. The lower mold 32 is
It is fixed to the bed side of a press machine (not shown).
The upper die 33 and the pad 34 are simultaneously attached to the ram side of a press machine (not shown).

The pad 34 has a function of pressing the panel 21 against the upper surface of the lower die 32 when the ram (not shown) is lowered. A bending blade 33a is provided at the bottom of the upper die 33. The end of the panel 21 pressed by the lower die 32 is bent downward by the bending blade 33a of the lower die 32. As a result, the bent flange portion 22 is formed on the panel 21. A pressure accumulating means 41, a thrust generating means 61, and a detecting means 71 are provided near the lower die 32.

The pressure accumulating means 41 comprises a first cylinder 52, a first piston 53, a biasing member 54, and a reserve tank 5.
5, a first solenoid valve 56, a pressure sensor 57, and a first controller 58. A first piston 53 is fitted in the first cylinder 52 so as to be vertically movable. The inside of the first cylinder 52 is partitioned by the first piston 53 into a gas chamber 52a and a liquid chamber 52b. The rod portion 53b of the first piston 53 projects from the first cylinder 52, and the rod portion 53b can come into contact with the pressure accumulating rod 36 provided on the upper die 33 side.

The liquid chamber 52b of the first cylinder 52 can communicate with the reserve tank 55 via a passage 59, and a first solenoid valve 56 is arranged in the passage 59.
The oil 42 is stored in the reserve tank 55. The oil 42 in the reserve tank 55 can flow into the liquid chamber 52b of the first cylinder 52 via the passage 59, and the oil 42 flowing into the liquid chamber 52b passes via the passage 59 to the reserve tank 55. Backflow is possible inside.

In the gas chamber 52a of the first cylinder 52,
An elastic body 54 is arranged as a biasing member that biases the first piston 53 upward. The gas chamber 52a is filled with nitrogen gas (N ₂ gas) 43 as a gas.
The nitrogen gas 43 in the gas chamber 52a is the same as the first piston 53.
It is designed to be compressed by the downward movement of the.
The first cylinder 52 is provided with a pressure sensor 57 that detects the pressure inside the gas chamber 52a.

The signal from the pressure sensor 57 is input to the first controller 58. The first control unit 58 controls the opening / closing of the first electromagnetic valve 56 based on the signal from the pressure sensor 57. First of the first cylinder 52
The seal ring 44,
45 are provided.

The thrust generating means 61 is the second cylinder 6
2, a second piston 63, a biasing member 64, a second electromagnetic valve 65, and a second control unit 66. A second piston 63 is fitted in the second cylinder 62 so as to be horizontally movable. The inside of the second cylinder 62 is partitioned by the second piston 63 into a gas chamber 62a and a spring chamber 62b. Rod portion 63b of the second piston 63
Protrude from the second cylinder 62.

The gas chamber 62a of the second cylinder 62 can communicate with the gas chamber 52b of the first cylinder 52 via a passage 67. In the passage 67, the second solenoid valve 65
Are arranged. Spring chamber 62b of the second cylinder 62
A compression coil spring 64 as a biasing member that biases the second piston 63 toward the gas chamber 52b is disposed in the.

The nitrogen gas 43 in the gas chamber 52b of the first cylinder 52 can flow into the gas chamber 62b of the second cylinder 62 via the passage 67. The nitrogen gas 43 flowing into the gas chamber 62b of the second cylinder 62 is
The urging force of the compression coil spring 64 pushes back the gas chamber 61 of the first cylinder 52 via the passage 67. The second solenoid valve 65 is controlled to be opened and closed by the second control unit 58.

The upper die 33 has a motion rod 3 extending downward.
7 is attached. A sub lifter 82 extending upward is attached to the lower die 32 side. Sub lifter 82
Has a table 82a that is movable in the vertical direction, and the table 82a is always biased upward. The operating rod 37 is brought into contact with the table 82a of the sub lifter 82, and the table 82a is moved downward by pressing the operating rod 37.

A lever 83 is attached to the table 82a of the sub lifter 82. In the vicinity of the sub lifter 82, a limit switch 71 as height detecting means fixed to the lower die 32 side is provided. The limit switch 71 is operated by a lever 83. The limit switch 71 has a function of detecting that the upper mold 33 has risen to a height H that does not interfere with a punching punch 91 described later, after the bending flange portion 22 is formed on the panel 21 by the lowering of the upper mold 33. is doing.

The signal from the limit switch 71 is the second
Is input to the control unit 58. The second control unit 58
The second solenoid valve 65 is opened based on the signal from the limit switch 71 when the upper die 33 is raised, and the nitrogen gas 43 in the first cylinder 52 kept in the compressed state is transferred to the second cylinder 62. It has a function of flowing into the gas chamber 62a.

A punch punch 91 is attached to the tip of the second piston 63 fitted in the second cylinder 62. The tip of the punch punch 91 has a die hole 32a of the lower die 32 adjacent to the bending flange portion 22 of the panel 21.
It is possible to enter. The punch punch 91 is adapted to move in the direction of the die hole 32a by the pressure of the compressed nitrogen gas 43 flowing into the gas chamber 62a of the second cylinder 62. A stripper rubber 92 is attached to the outer periphery of the tip of the punch punch 91.

Next, the simultaneous bending and punching method and its operation will be described. The panel 21 is set on the lower mold 32 with the upper mold 33 at the top dead center. Panel 21
When the positioning of the lower mold 32 on the lower mold 32 is completed, the upper mold 33 and the pad 34 are lowered, and the panel 21 is pressed against the lower mold 32 by the pad 34, as shown in FIG. In this state, the table 82a of the sub lifter 82 is pushed down by pressing the operating rod 37 provided on the upper die 33 side, and the limit switch 71 is operated by the lever 83. When the limit switch 71 operates when the upper die 33 is descending, the second control section 66 causes the second solenoid valve 65 to operate.
Is closed.

When the upper die 33 is further lowered, the panel 21
Is bent downward by the bending blade 33a of the upper die 33. As a result, as shown in FIG. 3, the bent flange portion 22 is formed on the panel 21. When the bending flange portion 22 is molded by the upper mold 33, the pressure accumulating rod 36 provided on the upper mold 33 side contacts the first piston 53 of the pressure accumulating means 41, and the first piston 53 is moved downward. Due to the movement, the nitrogen gas 43 in the gas chamber 52a is compressed. The nitrogen gas 43 is compressed until the upper die 33 reaches the bottom dead center, and in this state, the oil 42 in the reserve tank 55 flows into the liquid chamber 52b of the first cylinder 52 via the passage 59. ..

When the bending flange 22 is completely formed,
The upper die 33 rises, but at the bottom dead center the first cylinder 52
Since the first electromagnetic valve 56 is closed based on the signal from the pressure sensor 57 that detects the pressure in the gas chamber 52a, the first piston 53 cannot move and the upper die 33 is raised. Regardless, the pressure in the gas chamber 52a can be maintained at the pressure at the bottom dead center.

Further, the upper die 33 continues to rise and the bending blade 33
When the upper die 33 reaches a position where the interference between a and the punch punch 91 is reliably avoided, the limit switch 71 is operated by the lever 83 provided on the sub lifter 82.
The second controller 66 controls the second solenoid valve 65 based on the signal from the limit switch 71 when the upper die 33 moves up.
Open.

When the second solenoid valve 65 is opened, the compressed nitrogen gas 4 in the gas chamber 52a of the first cylinder 52 is
3 through the passage 67 to the gas chamber 62 of the second cylinder 62.
led to a. The nitrogen gas 43 introduced into the gas chamber 62a of the second cylinder 62 presses the second piston 63, and the punching punch 91 attached to the tip of the second piston 63 is a die hole of the lower die 32. Move forward toward 32a.

When the tip of the punch punch 91 enters the die hole 32a of the lower die 32, the bending flange portion 22 of the panel 21 has the punch punch 91 and the die hole 32a as shown in FIG. It is punched by the shearing force generated by. As a result, the punched hole 2 is formed in the bending flange portion 22.
3 is molded.

When the punched hole 23 is formed in the bending flange portion 22, the pressure in the gas chamber 52a of the first cylinder 52 drops, and the second pressure is detected based on the signal from the pressure sensor 57 which detects this pressure. The solenoid valve 65 is opened. Second
When the electromagnetic valve 65 is opened, the first piston 53 is pushed up by the urging force of the elastic body 54 arranged in the gas chamber 52a, and as shown in FIG. 5, the oil in the liquid chamber 52b of the first cylinder 52 is removed. 42 is pushed back into the reserve tank 55 via the passage 59. Further, since the compression coil spring 68 is arranged in the second cylinder 62, the second piston 63 is pushed back by the urging force of the compression coil spring 64, as shown in FIG.

In this embodiment, one pressure accumulating means 41 is used.
Although one thrust generating means 61 is driven by the above, when a plurality of punching processes are simultaneously performed, it is possible to add only the thrust generating means 61. Further, although the lever 83 for operating the limit switch 71 as the height detecting means is attached to the sub lifter 82 fixed to the lower die 32 side, it may be attached directly to the upper die 33.

[0034]

According to the present invention, the following effects can be obtained.

(1) A part of the lowering energy of the upper die is accumulated in the pressure accumulating means, and is accumulated when the upper die ascends to a position where it does not interfere with the punch punch after forming the bending flange portion by lowering the upper die. Since the punching punch is driven by driving the punch punch using the lowered energy of the upper die, it is necessary to provide a relief hole in the upper die to prevent interference with the punch punch. Instead, the bending flange portion can be punched by a punch punch. Therefore, the rigidity of the bent portion of the upper die can be increased by the amount that the escape hole is unnecessary, and the processing accuracy of the bent flange portion can be increased.

In the structure using the conventional cam mechanism, the escape hole cannot be formed in the bending blade depending on the conditions such as the position and size of the punching hole, and it becomes difficult to perform bending and punching at the same time. In some cases, the bending process and the punching process have to be performed in separate steps. In the present invention, since the upper die can be completely released and punching can be performed by the punch punch, it is possible to perform both bending and punching with a single press die. Administrative costs can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus to which a simultaneous bending punching method according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view of essential parts showing a state immediately before bending in the device of FIG.

FIG. 3 is a cross-sectional view of essential parts showing a state when the bending process is completed in the device in FIG.

FIG. 4 is a cross-sectional view of essential parts showing a punched state of the bending flange portion in the apparatus of FIG.

5 is a cross-sectional view of essential parts showing a state after completion of punching processing of the bending flange portion in the apparatus of FIG.

6 is a time chart showing the operation status of each unit in the apparatus of FIG.

FIG. 7 is a perspective view of a pressed product in which a panel is bent and punched.

8 is a cross-sectional view of a main part of a conventional press working apparatus used for molding the press product of FIG.

[Explanation of symbols]

 21 Panel 22 Bending Flange Part 23 Punching Hole 31 Pressing Machine 32 Lower Mold 32a Die Hole 33 Upper Mold 34 Pad 41 Pressure Accumulation Means 61 Thrust Generation Means 71 Height Detecting Means 91 Hole Punching Punches

Claims (2)

[Claims] 1. A bending flange portion is formed by lowering an upper die at an end portion of a panel pressed to a lower die by a pad, and when the upper die is lowered, a part of lowering energy of the upper die is accumulated. By detecting that the upper die has risen to a predetermined height after forming the bending flange portion, the punching punch is driven by using the energy accumulated when the upper die is lowered, and the bending flange portion is punched. A method for simultaneous bending and punching, which is characterized in that 2. A pressure accumulating means for compressing gas by the descending energy of the upper mold for bending the end portion of the panel set in the lower mold and holding the compressed state of the gas, and bending the panel into the panel by lowering the upper mold. After the flange portion is formed, the thrust is generated by the height detecting means for detecting that the upper die is raised to a predetermined height, and the compressed gas supplied from the pressure accumulating means based on the detection signal from the height detecting means. A press working apparatus comprising: a thrust generating unit that generates the thrust; and a punch punch that is attached to the thrust generating unit and that can be inserted into a lower die hole adjacent to the bending flange portion of the panel.