JPH04129515U - Press impact prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the breakthrough noise generated when punching a workpiece. [Structure] In a press that punches a plate-shaped workpiece 4 between a vertically movable punch 3 and a die 5 provided below the punch 3, the press body 1 is attached to a main frame 1.
A and a sub-frame 6, and between the main frame 1a and the sub-frame 6, a shock absorbing means consisting of a hydraulic cylinder 10 and a variable throttle 15 for absorbing and attenuating the breakthrough impact generated when punching the workpiece 4 is provided. Since this shock absorbing means can efficiently absorb shock and vibration, breakthrough noise can be reduced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea reduces the breakthrough noise that occurs when punching a workpiece with a press. This invention relates to a shock prevention device for a press.

0002

[Conventional technology]

Conventional presses such as blanking presses and turret punch presses have a plate-like Breakthrough noise occurs when punching a workpiece. This is due to the amount of energy accumulated on the frame of the press body when punching of the workpiece begins. This occurs because energy is released instantly at the same time as the workpiece is punched, and it is caused by vibration. Not only does it cause noise due to movement and impact noise, but it also shortens the life of the press itself. There is a problem. In order to improve this problem, various methods have been used to reduce breakthrough noise. has been devised. For example, Japanese Patent Application Laid-open No. 183919/1983.

0003

[Problem that the idea aims to solve]

However, conventional devices of this type are not very effective against breakthrough noise. In addition, the speed of the punch is reduced during the punching process, which may cause sagging, curling, or peeling of the product. There are defects such as the occurrence of problems such as deterioration of product quality. This idea was made with the purpose of improving the above-mentioned problems, and it effectively reduces break noise. The purpose is to provide a press impact prevention device that can effectively reduce the impact. .

0004

[Means to solve the problem]

In order to achieve the above purpose, this invention has a punch that can move up and down and a lower part of the punch. In a press that punches out a plate-shaped workpiece between dies installed on both sides, the press The system body consists of a main frame and a subframe, and these main frames Absorbs and alleviates the breakthrough impact that occurs when punching the workpiece between the frame and the subframe. It is equipped with a shock absorbing means.

[0005]

[Effect]

With the above configuration, the shock absorbing means absorbs the shock and vibration that occurs at the same time as punching the workpiece. Since no shock or vibration is generated in the press body, breakthrough noise can be reduced. You will be able to figure it out.

[0006]

【Example】

An embodiment of this invention will be described in detail with reference to the drawings. Figure 1 is a side view and diagram of a turret punch press that uses the shock prevention device of this invention. 2 shows the same sectional view. In these figures, 1 is the press body, which is approximately C-shaped. It has a main frame 1a, and a striking machine is mounted on the upper part of the open end side of the main frame 1a. A punch 3 is driven vertically by the mechanism 2, and a workpiece is placed between the punch 3 and the punch 3 at the bottom. A die 5 for punching the block 4 is provided.

[0007] Further, a subframe 6 is provided within the main frame 1a. Like the main frame 1a, the subframe 6 also has an almost C-shape and is openable. The lower part on the distal end side is rotatably supported by the main frame 1a by a pin 7. The lower part of the rear end of the subframe 6 is elastically supported by an elastic body 8 such as a rubber pad. The upper part of the open end side of the sub-frame 6 and the upper part of the main frame 1a are A hydraulic cylinder 10 is installed between the parts with the piston rod 10a facing upward.

[0008] On the other hand, numeral 11 in the figure is a hydraulic pump, and the oil discharged from this hydraulic pump 11 is piped into the pipe 1. 2 is supplied to the bottom side of the hydraulic cylinder 10 via the check valve 13. At the same time, an accumulator 14 is connected to the upstream side of the check valve 13. There is. In addition, the rod side of the hydraulic cylinder 10 has a return pipe with a variable throttle 15 in the middle. 16 to a tank 17.

[0009] Next, to explain the action, the punch 3 that is now struck by the striking mechanism 2 and descends. When punching of the workpiece 4 is started between the dies 5, the main frame is The upper part of the open end side of the frame 1a is pushed up, creating an opening in the main frame 1a. However, the lower part of the open end side is a subframe that is pivotally connected to the main frame 1a by pin 7. Since no punching reaction force acts on the arm 6, opening does not occur, and this causes the hydraulic system to The cylinder 10 is extended and oil is replenished on the bottom side.

0010 Then, when the workpiece 4 is punched between the punch 3 and the die 5, the main plane The energy stored in frame 1a is instantly released and main frame 1a Trying to return to the original position. However, oil was replenished on the bottom side between main frame 1a and subframe 6. Because the hydraulic cylinder 10 is interposed, it tries to return to the main frame 1a. This force is blocked by the subframe 6 via the hydraulic cylinder 10.

[0011] After that, the oil on the bottom side of the hydraulic cylinder 10 passes through the variable throttle 15 to the tank 16. While being drained, the return force of the main frame 1a is converted into heat and gradually attenuated. This makes it possible to reduce noise caused by vibration and impact.

0012 In addition, the impact generated varies depending on the thickness of workpiece 4 and the size of the product to be punched. However, by adjusting the variable aperture 15 according to the magnitude of the impact, the impact can be efficiently reduced. At the same time, the variable aperture 15 can be automatically adjusted electrically. It is also possible to do so.

[0013] Note that there is no piston in the hydraulic cylinder 10 even when the main frame 1a is at its maximum displacement. The stroke of the hydraulic cylinder 10 is adjusted in advance so that the ton does not reach the stroke end. By providing a margin, excessive force is not applied to the main frame 1a and subframe 6. can be prevented from working.

[0014]

[Effect of the idea]

As detailed above, this idea was developed to address the breakthrough that occurs when punching a workpiece. The hydraulic cylinder absorbs vibrations and shocks caused by vibrations and shocks. It is possible to efficiently reduce the noise caused by the press, and also to extend the life of the press itself. It becomes like this. In addition, the hydraulic cylinder pushes up the main frame at the moment the punch contacts the workpiece. By increasing the speed of the punch, you can slow down the relative speed when the punch contacts the workpiece. This also makes it possible to reduce noise when the punch comes into contact with the workpiece.

[Brief explanation of drawings]

FIG. 1 is a side view of a press brake employing an impact prevention device according to an embodiment of the invention.

FIG. 2 is a cross-sectional view taken along line AA in FIG. 1;

[Explanation of symbols]

1 press body, 3 punch, 4 workpiece, 5 die,
6 subframe, 10 hydraulic cylinder, 15 variable aperture.

Claims (2)

[Scope of utility model registration request] 1. In a press that punches a plate-shaped workpiece 4 between a vertically movable punch 3 and a die 5 provided below the punch 3, a press body 1 is connected to a main frame 1a and a subframe 6. A shock prevention device for a press is constructed of the following, and is provided with a shock absorbing means for absorbing and mitigating the breakthrough shock generated when punching a workpiece 4 between the main frame 1a and the subframe 6. 2. The shock absorbing means is a hydraulic cylinder 10.
and a variable throttle 15 that converts the hydraulic pressure discharged from the hydraulic cylinder 10 into heat and damps it.
Shock protection device as described.