JPS5828655Y2 - Breakthrough prevention device in press - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a breakthrough prevention device in a press.

In recent years, many pollution problems have come to be taken up as social problems, but it is extremely difficult to prevent noise and vibration, which are the most common problems.
It is one of the causes of hearing loss for workers inside the factory as it generates quite large noise of ~120 dB or more, and also poses a problem as noise pollution to those outside the factory. It's going to happen.

The purpose of this invention is to provide a low-vibration, low-noise press that meets these social demands.

As a conventional measure to prevent noise and vibration, some models have installed shock absorbers on the bottom surface of the slide and the top surface of Borsmei to alleviate the release of breakthrough energy. However, since the adjustment was done by inserting or removing a spacer from the absorber rod, improper adjustment could result in an abnormal load being applied to the slide or the slide not functioning as a shock absorber. It took a lot of effort and time to make adjustments.

In addition, it has the disadvantage that the die space is large, resulting in poor workability.

The present invention aims to eliminate this drawback and provide a device for preventing breakthrough occurrence in a press that can be adjusted in a short time, does not affect the die base, and has good workability.

Referring to the drawings of an embodiment of the present invention, FIG. 1 shows a schematic view of a breakthrough prevention device attached to part A.

FIG. 2 shows a state where the device is working near the bottom dead center, and FIG. 3 shows a state where the device is not working near the top dead center.

A cylinder receiver 5 is provided in the frame portion 1 of the press at a position where the cylinder 4 of the buffer hydraulic cylinder device 3 is received by the frame portion 1 of the buffer hydraulic cylinder device 3 guided in the vertical direction by a cylinder guide 2 and the buffer hydraulic cylinder device 3. , one end 6a of the rod 6 is inserted into the cylinder 4 of the buffer hydraulic cylinder device 3, and is tightened with a nut 7.
A piston 9 fixed with a locking screw 8 is built in, and a hydraulic chamber 10 is provided between the piston 9 and the cylinder 4.

The hydraulic chamber 10 is connected to a pneumatic hydraulic tank 12 via a check throttle valve 11.

It is covered with a cap 14 having a piston breathing port 13 on the opposite side of the hydraulic chamber 10, and is tightened with a cap bolt 15.

A nut member 16 is screwed onto a threaded portion provided at the other end 6b of the rod 6, and a worm gear is formed on the outer periphery of the nut member 16, which also serves as a worm wheel.

The slide 11 is assembled into the worm case 19 in a state in which it is engaged with a worm shaft 20 rotatably held in the worm case 19 which is fixed to the slide 11 by a worm case bolt 18.

At the top of the worm case 19 is the Rondro 0 rotation stopper 2.
1 is fixed.

Next, to explain the operation of the present invention, as shown in FIG. 4, when the press is operated without load, the slide moves according to the stroke curve A-I-F.

For example, if we perform punching work, the stroke curve will be A-E-J-E, and at the same time the load diagram will also be C-H.
- becomes a -G curve.

The load gradually increases over time, but if the material breaks, it decreases rapidly, and at the same time a negative load is applied, the slide suddenly decreases at the bottom dead center of the housing.

This is a breakthrough.

It is a well-known fact that these have a large impact on noise and vibration.

FIG. 3 shows the state at top dead center. At this time, the nut 1 at the top of the piston 9 is connected to the bottom of the camp 14 and the hydraulic chamber 10.
tangential for hydraulic pressure.

When the load is applied and the stroke curve reaches a point from A to E, the cylinder 4 is brought into contact with the cylinder receiver 5.

At this time, the slide attempts to move from point E to point 5 due to a breakthrough.

However, since the cylinder 4 of the shock absorber is mechanically stopped by the cylinder receiver 5, the piston 9 is moved into the hydraulic chamber 1.
In order to compress 0 oil and prevent the slide from dropping suddenly, the curve passes through the broken line B and reaches the bottom dead center F.

At the same time, the load also passes through the curve CHDG.

When the slide reaches the bottom dead center, nut 17 and cap 1
The clearance L with respect to 4 becomes maximum, but when the slide passes the bottom dead center and tries to rise, the hydraulic pressure in the hydraulic chamber 10 becomes zero and expands by the compressed amount, and at the same time, due to the pressure inside the empty hydraulic tank 12, the hydraulic pressure in the hydraulic chamber 10 becomes zero. ) 7 and the bottom of the cap 14 rise while touching each other.

In this case, to ensure smooth movement of the piston 9, an air breathing port 13 is provided so that the pressure is equal to atmospheric pressure.

When the slide descends and the nut T and cap 14 are in contact with each other at point E on the slide stroke diagram, when a breakthrough is about to occur and the slide 1T suddenly falls from E to J on the slide stroke curve, the hydraulic chamber 10
The oil is compressed, and the load does not suddenly drop from H to K, but slowly drops from H to D between bottom dead center F1 and Gt.

Furthermore, when changing the die-hydride, the cylinder 4 can be moved quickly with a single button by driving an electrically controlled electric motor via the worm shaft 20 and the nut member 16.

According to this example, the number of attachments is one, but it is conceivable to attach a plurality of them depending on the press capacity and slide area.

Further, in this example, an empty hydraulic tank is used to apply pressure to the hydraulic chamber, but it is also possible to use a high-pressure accumulator device.

Since the present invention has the above-described configuration, (a) the mold mounting space is not reduced compared to a system in which the hydraulic cylinder device is provided in the bolster section.

←) Since the height of the mold does not increase, the die of the press
・There is no substantial decrease in the number of items.

(c) Since it is not built into the mold, there is no problem in taking out the product or scrap (there is no interference between the hydraulic cylinder device and the chute).

) With die-hide adjustment (slide adjustment), the position (height) of the hydraulic cylinder device 3 is automatically adjusted (in conjunction with die-hide adjustment using the worm shaft), reducing setup time. I'll try it.

Others (7) Since the hydraulic cylinder device 3 has a structure that moves up and down by the vertical movement of the slide, the total height of the hydraulic cylinder device can be small, and the amount of pressure oil can also be small.
There are other effects.

[Brief explanation of the drawing]

Fig. 1 is a simplified diagram for explaining the position of an embodiment of the device installed on a press according to the present invention, and Fig. 2 is a detailed enlarged view of section S in Fig. 1, showing that the device is working when the press is near the bottom dead center. Indicates the state in which FIG. 3 shows a state where the Greska is near the discharge dead center and the device is not working. FIG. 4 is a curve diagram showing the relationship between the slide stroke of the press and the load. 1 is the frame of the press, 2 is the cylinder guide, 3 is the hydraulic cylinder device for buffering, 4 is the cylinder, 5 is the cylinder holder, 6 is the rod, I is the nut, 8 is the locking screw, 9 is the piston, 10 is the hydraulic pressure 11 is a check throttle valve, 12 is a pneumatic/hydraulic member, 13 is an air breathing port, 14 is a cap, 15 is a bolt for the cap, 16 is a nut member, 17 is a slide, 18 is a bolt for a worm case, 19 is a Worm case, 20 is worm shaft, 2
1 is a rotation stopper, 22 is a bolster, 23 is a bed, and 24 is a connecting rod.

Claims (1)

[Scope of utility model registration request] In a breakthrough prevention device using a hydraulic cylinder device, a hydraulic cylinder device that can be raised and lowered freely and whose lower limit is regulated is provided in the body of the press, and a piston rod that protrudes downward from the hydraulic cylinder device is connected to the sliding portion of the press. When screwed into a nut member that is freely rotatable and restrained in the axial direction, 44C1 is provided with a rotation stopper for the piston rod, a worm gear formed on the outer periphery of the nut member, and a worm shaft that meshes with the worm gear. A cap is rotatably provided on the slide portion and corresponds to an upper part of the piston rod or a member fixed thereto, and a cap is provided on the hydraulic cylinder device to check a hydraulic chamber of the hydraulic cylinder device that urges the piston rod upward. A device for preventing breakthrough occurrence in a press, characterized in that it is connected to an air-hydraulic tank via a throttle valve.