JP2771619B2 - Simulated punch load generator for punching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a punching apparatus such as a punch press.
The present invention relates to a simulated punching load generator used for a punching durability test and the like.

(Prior Art) In a punching durability test of a punching device such as a punch press, it is necessary to repeatedly apply a punching load to the punching device.

In view of this, a simulated punching load generating device or a hydraulic cylinder device configured to generate a simulated punching load by using a spring and compressing the spring due to unevenness or a striker of the punching device, A simulated punching load generating device configured to generate a simulated punching load when the piston member is pressed by unevenness or a striker against the hydraulic pressure of the cylinder chamber.

If the simulated punching load generator as described above is used for the durability test of a punching device, the durability test is performed without actually punching the plate material repeatedly, and the durability is improved efficiently and without consuming the test plate material. The test will be performed.

(Problems to be Solved by the Invention) The punching load generated at the time of punching a plate material by a punching device such as a punch press does not become the maximum at the bottom dead center of a ram, a striker or the like, but is slightly before this, for example. In a 6-ton punch press, it shows a change characteristic that it is about 5 to 6 mm from the bottom dead center, becomes maximum at a position in front, and then decreases.

On the other hand, in a spring-type simulated punching load generator, the spring generally only increases the spring load proportionally according to the compressive deformation, so that the simulated punching load has a load change characteristic as described above. When it cannot be applied to the punching device and the required capacity tonnage of the punching device is large, it is impossible to generate a large simulated punching load in a limited space depending on the spring.

Although the above-mentioned problems do not occur in the hydraulic simulated punching load generating device, a hydraulic control device for switching the flow of the hydraulic pressure from the hydraulic power source is required, and the simulated punching load generation characteristics as described above are required. In order to generate a punching load, the hydraulic control thereof cannot be easily performed, and a complicated control device is required. In practice, the device becomes considerably large.

For this reason, in the endurance test or the like of a punching apparatus, the simulated punching load generator as described above is not actually used, but is actually performed by actually punching a plate material. This endurance test consumes a great deal of wear and tear.

An object of the present invention is to provide a simulated punching load generator for a practical punching machine that generates an appropriate simulated punching load by simplifying the structure in view of the problems described above and is easily used for a durability test and the like. And

According to the present invention, there is provided a piston member to which a punching load is applied from a punching device, and a fluid pressure which reciprocally receives the piston member. And a cylinder member that constitutes a cylinder chamber that urges the piston member in a direction opposite to the punching load by being provided with the piston member. This is achieved by a simulated punching load generating device for a punching machine, characterized in that a valve port is provided that opens the cylinder chamber in alignment with each other when the cylinder has moved by a predetermined amount.

(Operation) According to the configuration described above, when the piston member moves by a predetermined amount from the initial position, the cylinder chamber is drained by the valve port, so that special hydraulic control such as switching the flow of hydraulic pressure from the hydraulic pressure source is performed. A simulated punching load that becomes the maximum load at a predetermined stroke position can be obtained without requiring any device.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a simulated punching load generating device for a punching device according to the present invention. In FIG. 1, reference numeral 1 denotes a cylinder member. The cylinder member 1 receives a piston member 5 in a cylinder bore 3 so as to be able to reciprocate in the axial direction, that is, in the vertical direction in the figure.

The piston member 5 has a piston flange 7, an upper piston rod 9 extending upward from the piston flange 7 in the figure, and a lower piston rod 11 extending downward from the piston flange 7 in the figure. doing. The upper piston rod 9 penetrates through the cylinder member 1 and protrudes upward therefrom, and has a projecting end provided with a punching load imparting portion 13 to which a punching load such as a ram or striker R of a punching machine such as a punch press is applied. The lower piston rod 11 has a cylinder guide 1 as a center guide member.
Is slidably fitted in the guide hole 15.

The cylinder member 1 cooperates with the piston flange portion 7 on the side of the lower piston rod 11 of the piston member 5 in the cylinder chamber.
17 are composed. The cylinder chamber 17 is provided with a compression coil spring 19 as a return spring.
Urges the piston member 5 upward in the figure, that is, toward an initial position as shown.

The cylinder member 1 is provided with a hydraulic pressure supply port 21 for supplying hydraulic pressure to the cylinder chamber 17, and a predetermined hydraulic pressure is supplied to the hydraulic pressure supply port 21 from a hydraulic pressure source 23 constituted by a hydraulic pump or the like. ing.

Further, the cylinder member 1 is provided with a valve port 25 opened to the sliding surface portion 17a of the piston flange portion 7,
The cylinder chamber 17 is provided in the piston flange 7 with the sliding surface.
A valve port 27 communicating with 17a is provided.
The valve port 27 is aligned with the valve port 25 of the cylinder member 1 when the piston member 5 moves a predetermined distance from the initial position as shown, for example, a stroke distance indicated by a load L in the drawing. It has become.

The cylinder member 1 is provided with drain ports 31 and 33 for discharging leaked hydraulic pressure and an oil drain port 35 of the cylinder chamber 17, and the drain ports 31 and 33 are respectively provided with oil tanks.
The drain port 35 is connected to the oil tank 29 via a drain valve 37.

When the simulated punching load generator having the above configuration is used for the durability test of the punching apparatus, a hydraulic pressure of a predetermined pressure is constantly supplied from the hydraulic pressure source 23 to the hydraulic pressure supply port 21. As a result, a hydraulic pressure of a predetermined pressure is supplied to the cylinder chamber 17, and the pressing force by this hydraulic pressure acts on the piston flange portion 7 of the piston member 5 as an upward force in the figure. When a punching load is applied to the punching load imparting surface 13 of the piston member 5 by the striker R of the punching device, the piston member 5 moves from the initial position as shown in FIG. As a result, a simulated punching load acts on the striker R.

As the piston member 5 descends against the oil pressure in the cylinder chamber 17, the simulated punching load acting on the striker R increases. When the piston member 5 descends from the initial position by a predetermined stroke L, the valve port 27 of the piston flange portion 3 comes into alignment with the valve port 25 of the cylinder member 1 so that the cylinder chamber 17 is drained. Become. By releasing the drain, the hydraulic pressure in the cylinder chamber 17 is eliminated at once, whereby the simulated punching load acting on the striker R is eliminated at a stretch, and the striker R descends to the bottom dead center and thereafter starts rising. Then, the piston member 5 returns by the spring force of the compression coil spring 19, returns to the initial position, and prepares for the next operation.

The predetermined stroke L may be determined in accordance with the stroke at which the punching load is maximized. As a result, as shown in FIG. The punching load is repeatedly applied to the striker R with characteristics. The punching load is freely adjusted by changing the hydraulic pressure applied to the cylinder chamber 17 from the hydraulic pressure source 23, and the endurance test is efficiently performed by giving a shearing state to the punching device without actually punching the plate material. Becomes possible.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to this, and various embodiments can be made within the scope of the present invention. It will be clear to those skilled in the art.

[Effects of the Invention] As can be understood from the above description of the embodiment, in the simulated punching load generating device according to the present invention, when the piston member moves by a predetermined amount from the initial position, the cylinder chamber is opened by the valve port. Since the drain is released, a simulated punching load, which is the maximum load at a given stroke position, can be obtained without requiring a special hydraulic control device such as switching the flow of hydraulic pressure from the hydraulic source. Thus, a punching load change equivalent to the punching load change characteristic that occurs when a sheet material is punched can be obtained without punching the sheet material.
As a result, a durability test or the like of the punching apparatus can be performed without actually punching the plate material.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a simulated punching load generating device for a punching device according to the present invention, and FIG.
4 is a graph showing a change characteristic of a punching load obtained by the simulated punching load generator for a punching device according to the present invention shown in the figure. 1 ... Cylinder member, 5 ... Piston member 13 ... Punching load imparting part 17 ... Cylinder chamber, 21 ... Hydraulic supply port 23 ... Hydraulic source, 25, 27 ... Valve port

Claims (1)

(57) [Claims] 1. A piston member to which a punching load is applied from a punching device, and a cylinder for receiving the piston member reciprocally and receiving a fluid pressure to urge the piston member in a direction opposite to the punching load. A cylinder member forming a chamber, wherein the piston member and the cylinder member are provided with a valve port that drains the cylinder chamber in alignment with each other when the piston member moves a predetermined amount from an initial position. A simulated punching load generator for a punching device.