JPS6021832B2 - Automatic press noise prevention method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for preventing press noise and vibration.

In recent years, with the rapid development of various industries, the problem of pollution has been rapidly increasing as a social problem.

Among them, press processing noise is one of the major types of factory pollution.
Vibration issues have begun to be taken up.

As a method to prevent noise and vibration, a shock absorber is inserted between the upper mold and the lower mold, and the shock absorber capacity is increased from the lower mold side at the bottom dead center just before the upper mold pulls out the material. However, in this method, before the upper die punches the material, an absorber attached to the lower die applies the reverse pressure load to the slide, and the press slide maintains the absorber load until the bottom dead center work is completed. Because we are receiving
The press capacity and flywheel energy necessary for forming must have a press capacity that takes into account the ability to counter the absorber and the amount of energy, which increases the GM and motor output, which is not economical.

In addition, if an absorber is installed as described above on a conventional press without an absorber installed, the press capacity and energy that can actually be processed will be determined by subtracting the absorber capacity and the energy that opposes the absorber.
This has the drawback of reducing the ability originally specified as a specification, and reducing the effective usable ability required for actual processing. In addition, the position at which the absorber acts must be adjusted depending on changes in the thickness of the workpiece, and if the adjustment is incorrect, an abnormal load will be generated on the press.
The present invention eliminates these drawbacks, and even when a shock absorber is attached like a subordinate, there is no reduction in the effective usability required for actual processing.

In other words, during press work, the press slide does not receive the load of the shock absorber capacity during the stroke until the bottom dead center work is completed, and the energy consumed by the absorber is extracted without causing loss of flywheel energy. The present invention aims to provide a method and apparatus for preventing noise and vibration caused by frame deformation energy generated during work, etc. To explain the present invention with reference to the drawings of one embodiment, as shown in FIG. The opposite tension twills 4 are fixed by plackets 3 and 2, and shock absorber devices are attached to both sides of the frame at the bottom of the bed, facing the lower end surfaces of the respective tension twills 4.

The upper end surface 7' of the piston rod 7 of the shock absorber device 5 and the lower end 4'' of the tension rod 4 are located in the lowermost chamber of the absorber when no load is applied, as shown in the detailed cross section of the shock absorber device 5 in FIG. Due to the air pressure of the tool, they are constantly brought into contact with each other noisily.Currently, as the work load increases after the upper mold comes into contact with the material during the actual punching operation, each frame member is subject to stress and strain corresponding to the work load. As a result, the dimension under no load shown in FIG. The air piston punch chamber at the lower end follows this increase and always maintains 4r,
7' maintains contact without separating until the extraction operation is completed. When the dimensions increase due to an increase in the work load, the frame becomes so-called jaw-opened, and the tension rod 4 is slightly inclined from the vertical position. The end surface of the tip 4'' is a curved surface.As the work load increases, a considerable amount of elastic energy is stored in each frame member, but as soon as the work is completed, this elastic energy is instantly dissipated.

That is, a breakthrough occurs. At this time, intense vibration is induced in each frame member, accompanied by noise.
In order to slowly release the elastic energy generated between the frame members due to the action of the device of the present invention, an absorber device 5 is installed between the frame head a and the frame lower opening to release these elastic energies. This prevents vibration and noise from occurring in the frame area. In this way, the work load due to press working causes stress and strain stored in the frame to be released while being buffered externally, so no load is generated that would reduce the press capacity.

A step 4' is provided near the upper end of the tension rod 4 to prevent the tension rod from sliding upward when the tension rod mounting brackets 3, 2 are tightened.

If the attachment of the tension ridge 4 impairs work efficiency such as mold replacement, please attach the tension ridge 4 as shown in Figures 6 and 5.
Instead, as shown in 23, a groove 24 is provided just above the tension rod 23 whose upper part is joined by a pin joint, and during press work, the tension rod 23 is held vertically and an air cylinder 2 is inserted into the groove at 24.
The lower end of the rod 22 is inserted into the groove 24 and the tension rod 2
Lock the rotation of 3.

When changing the mold, etc., the piston rod 22 is moved to the groove 2 by operating the air valve 26 that operates the air cylinder 21.
4, the tip of the tension rod 23 is rotated to the rear side of the press, and operability can be improved by preventing it from becoming an obstruction in the left and right direction of the bolster. Although not shown, operability can be improved by providing a device for temporarily loosening the fixation of the tension rod 4 and moving it to a required height.

Next, in the operation of the absorber device 5 (see FIG. 4), as described above, the piston rod 7 is always pushed upward by the air in the chamber.

The air chamber is stored in an air tank by a regulator 19, and is constantly supplied with air through a checker 16. The upper chamber T of the air chamber H communicates with the atmosphere through the exhaust port Z.

On the other hand, due to the work load, the piston 7 also moves upward to follow the change caused by the increase in the dimension H shown in FIG. 1, and at the same time the piston 7 completes its removal, the piston 7 is forcibly pushed downward.

At this time, the oil in the two chambers is squeezed to provide resistance and absorb elastic energy. Now, when the piston 7 moves upward, the oil in chamber C opens a passage in the wood and flows into chamber two.

Since the piston diameters d and Q are the same for the chamber A and the second chamber, they have the same area. Therefore, the auxiliary oil tank 14 only needs to compensate for the leakage in the oil cylinder and can be small, and the size of the check 13 can also be small and the piping can be thin. On the other hand, when the piston 7 moves downward (operates when a breakthrough occurs), the wooden passage is closed due to the spring 12 of the check valve 11 and the pressure increase in the two chambers, and the oil in the two chambers has a variable resistance by adjusting the throttle valve 10. Since the fluid flows into the chamber while being constricted, the fluid resistance flowing through this passage serves to absorb the elastic energy.

The other passage is kept closed during operation, and is used to bleed air from the chamber using valve 9.

Regarding heat generation within the absorber, it is possible to cool the absorber by providing a cooling water inlet and an inlet around the outer layer 8 of the absorber, or to cool it from the outside using a fan.

Since the pressure-receiving area of the chamber C and the second chamber is the same, the piston rod 7
There is no excess or shortage of oil due to the movement of the piston, and the piston moves smoothly and quickly without inducing vibration. Furthermore, since no shock occurs in the flow of oil, noise generation can be prevented. Although the present invention can absorb a large amount of elastic energy due to stress and strain generated in the frame, a small amount of elastic energy due to stress and strain generated in the slide, connecting rod, and bolster remains, so a small absorber is required to remove this.

However, since the latter is smaller than the former, it does not have a large effect on the press ability. According to the present invention, even when the shock absorber is used as a subordinate, the effective usability necessary for actual processing will not be reduced.

That is, during press work, the press slide does not receive the load of the shock absorber capacity during the stroke until the bottom dead center work is completed, and the energy consumed by the absorber is reduced to flywheel energy loss. Noise and vibration caused by frame deformation energy generated during extraction work etc. can be prevented. Therefore, even if it is installed in an existing press, it can be installed without reducing the performance of the press specifications. or,
Even if the plate thickness of the molded material changes, there is no need to adjust the position of the absorber acting like a follower, so the installation operation is easy, and there is no need to adjust the position of the absorber as in the case of conventional presses. Another feature is that press work can be carried out safely without creating any load.

Also, since the absorber piston rod and tension rod are always in contact with each other, the absorber piston is used like a slave.

This eliminates the noise caused when the piston rod comes in contact with the piston rod.Since there is no excess or deficiency of oil during absorber operation, there is no need to install an external excess or deficiency compensator, and noise caused by oil shock can be prevented. It can move smoothly and quickly and has a good cushioning effect.

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of a press equipped with the device according to the present invention, Fig. 2 is a front view, Fig. 3 is a partial front view of arrow A in Fig. 2, and Fig. 4 is an operation of the absorber device. Explanatory diagram. FIG. 5 is a front view of another embodiment of the present invention, and FIG. 6 is a side view of FIG. 5. 1 is a frame, 2 and 3 are brackets, 4 is a tension rod, 5 is a shock absorber device, 6 is an absorber mounting seat, 7 is a piston rod, 8 is an outer layer,
9 is a valve, 10 is a throttle valve, 11 is a check valve, 12
is a spring, 13 is a checkerboard, 14 is an auxiliary oil tank,
15 is a variable throttle valve, 16 is a check, 17 is an air tank, 18 is a pressure gauge, 19 is a regulator, 20 is a rotating shaft, 21 is an air cylinder, 22 is a piston rod, 23 is a tension rod, 24 is a groove , 25 is a washer, and 26 is an air valve. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. The lower end surfaces of the tension rods fixed downward on both sides of the press head are brought into contact with the upper end surfaces of the absorber piston rods of the shock absorber device fixed on both sides of the lower part of the press bed. When the tension rod is displaced upward by pressing, the upper end surface of the absorber piston rod contacts and follows the tension rod, and immediately after the breakthrough occurs, the downward movement of the absorber piston rod due to restoration of the displacement occurs. A method for preventing press noise and vibration, characterized in that press noise and vibration are damped by fluid resistance acting on an absorber piston. 2. Tension rods are fixed downwardly on both sides of the press head, and a shock absorber device having absorber piston rods facing the tension rods is provided on both sides of the lower part of the press bed, and the absorber piston is attached to the device. A hydraulic cylinder to which the piston of the rod is adapted is provided, and a passage (f) between the passage (f) and the throttle valve 10 between the upper (c) chamber and the lower (d) chamber of the piston of the hydraulic cylinder is connected to the (d) passage (e). From the room (c)
A check valve 11 that closes toward the chamber is provided, an air cylinder is provided below the hydraulic cylinder, and the air piston rod of the air cylinder and the absorber piston rod are made of the same diameter and connected, and the air cylinder An apparatus for preventing press noise and vibration, characterized in that an air circuit is connected to the piston of the air piston rod to constantly urge the piston of the air piston rod upward and to cause the absorber piston rod to contact and follow the tension rod.