JPS59144545A - Punching device - Google Patents

Abstract

PURPOSE:To increase forming energy and to prevent the failure of a hammer and piston by adding the pressing force of compressed air to the dropping motion of the hammer and applying hammer impact via a liquid layer on a blank material. CONSTITUTION:When a main stop valve 19 of a valve chamber 2 is opened, the compressed air in an air charge tank 1 is fed to a cylinder 3 and presses a hammer 5 to depress a knock 6 engaging with a hammer groove 51 against the force of a spring 8. The hammer 5 exerted with the air pressure falls quickly by its own weight and gives falling impact on a piston 9 via a liquid layer 11 packed above the piston 9 in the lower part, then the piston 9 moles the product blank material 31 in a die base 30 underneath the piston under the large pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punching device that performs impact processing using a falling hammer. In forming processes such as riveting, punching, forging, metal powder forming, etc., in the case of small products, a forming piston is placed on the product material of the forming die, and the piston is subjected to impact from a falling hammer. A punch device that performs molding by applying force is convenient for molding work, and is advantageous for accurately molding products with a small amount of power. However, in this conventional method, since the hammer directly collides with the piston, which is the mold, there is a problem that the hammer or the piston may be damaged. In the present invention, a liquid layer is interposed in the upper part of the forming piston, and impact energy from compressed air is added to the single drop of the material to increase the forming pressing force while reducing the falling impact stress that the piston receives. It is an object of the present invention to provide a punching device that does not cause the problem of breakage mentioned above.

The present invention will be described with reference to the drawings. The attached drawings are longitudinal sectional views showing one embodiment of the punching device according to the present invention. Compressed air is constantly stored in an air charge tank 1 from an air compressor (not shown), and is connected from the charge tank 1 to a hammer operating cylinder 3 through a valve chamber 2. The dotted line 4 indicates the compressed air supply path. A hammer 5 is housed in the cylinder 3, and the hammer 5 is a cylindrical weight having a large number of grooves 51, 52-53, 54 (forming a labyrinth/docks), and usually one of the grooves, e.g. 510 is held at the top of the cylinder 3 by being supported by a notch 6 that engages on both sides. The Nozuku 6
is housed in a knocking chamber 7 provided on the outer wall of the cylinder 3, and is pressed by a spring 8 inserted into the knocking chamber 7 to engage the knocking groove 51 and lock the hammer 5 at that position. There is.

A molding piston 9 is housed in the lower part of the cylinder 3 with a slight stroke lO from the bottom of the cylinder. A liquid layer (liquid such as oil) 11 is provided above the piston 9.
is stored. A return air chamber 12 is provided above the liquid layer 11, and the air chamber 12 is provided with an exhaust hole 13 equipped with an on-off valve (electromagnetic valve) 14, and an air passage 15 communicating with the valve chamber 2. . The exhaust hole 1 is also equipped with an on-off valve (electromagnetic valve) 16 from the bottom of the cylinder 3 above.
7 and a small diameter air passage 18 communicating with the valve chamber 2. Further, the valve chamber 2 is provided with the compressed air supply path 4 from the air chamber 1 to the cylinder 3 as described above, and the air supply path 4 is provided with an on-off valve (electromagnetic valve) 19 (shown by dotted lines).
and the return air chamber 1 of the cylinder 3 above.
2 and the air path 18 from the bottom of the cylinder 4 are connected to the upstream side of the on-off valve 19 of the compressed air supply path 4, and on-off valves (electromagnetic valves) 20 and 21 (electromagnetic valves) are connected to the respective air paths.
(shown with dotted lines). The on-off valves 19, 14, and 16 are opened in synchronization; when valve 19 is opened, valve 14 is also opened at the same time, and after a certain amount of air is sent from air chamber 1 to cylinder 3, it is closed. The valve 16 is also opened at the same time and closed after discharging a certain amount of air within the piston stroke 10. Father's interview 2
0 and 21 as well, the opening of the valves is synchronous, and the hammer 5 falls and the molded member 9' at the tip of the piston 9 hits the cylinder 3.
Product material 3 stored in mold stand 30 set at the bottom
1 is opened when impact molding is performed, and closed when a certain amount of air is supplied. That is, the valve 20 causes the hammer 5 to rise when air from the air charge tank falls;
The first groove 51 is closed when the knock θλ of the cylinder 3 is engaged, and the valve 21 is closed when the piston 9 is lifted up and comes into contact with the protrusion 22 provided on the inner wall of the cylinder 3 (the piston 9
0 when it returns to its original position).

With the structure described above, when the main opening/closing valve 19 of the valve chamber 2 is opened, the compressed air in the air charge tank 1 is sent to the cylinder 3, presses the hammer 5, and engages the groove 51 of the hammer. Push down the matching knock 6 against the spring 8. Then, 7./75 falls rapidly due to its air pressure and its own weight, giving a falling impact to the piston 9 through the liquid layer 11 filled on the lower piston 9, and the piston 9 falls on the mold table at the lower part. The product material 31 in 30 is molded under great pressure. At this time, return air chamber 1 of cylinder 3
Since the on-off valve 14 of the exhaust hole 13 of No. 2 and the on-off valve 16 of the exhaust hole 17 at the bottom of the cylinder are also opened at the same time, the air in the cylinder at the bottom of the hammer 5 and the top of the piston 9 is exhausted. When the piston 9 stops falling, the air flow through the exhaust holes 13 and 17 disappears, and the valves 14 and 16 are closed.

Next, when the on-off valve 20 of the valve chamber 2 is opened, the valve 21 is also opened, and compressed air is sent to the bottom of the cylinder 5 and the bottom of the piston 9 through the air passages 15 and 18, respectively, and the cylinder and the piston are raised. When the groove 51 engages with the knock 6 and the piston 9 contacts the protrusion 22, the valves 20 and 21
is closed and each of the hammer screws is held in its original position.

As described above, according to the punching device according to the present invention, the hammer 5
The impact of the fall of the piston 9 is not only due to the hammer's own weight, but also due to the pressing force of the compressed air, so the energy required to form the product increases accordingly.

Alternatively, it can be made smaller as a device that obtains the same energy. However, since the impact of the hammer on the piston is through the liquid layer, there is no problem of damage to both the hammer and piston, and the return of the hammer and piston to their original positions is done manually. There is no need to do this, and automatic operation is possible through automatic valve operation, which increases work efficiency and can be used not only for molding but also for riveting and tightening.
This has an extremely large effect on processing industries such as crushing.

[Brief explanation of the drawing]

The attached figures relate to the invention. FIG. 1 is a cross-sectional view of an embodiment of a punching device. 1--1 air charge tank. 4-m-compressed air supply line; 5--hammer, 9-m-piston. 11-11 Liquid layer. Applicant Megumi Okudaira - 267-

Claims (1)

[Claims] In a punch device that applies the falling impact of a hammer to a piston to form and crush products, compressed air pressure is applied to the falling action of the hammer, and a liquid layer is created on the top of the piston. A punching device characterized in that the hammer impact is applied to the piston.