In this article, we will introduce the method and points of attention for punching small holes in the processing of stamping parts. With the development of science and technology and society, the processing method of small holes has been gradually replaced by the stamping processing method, by making the convex die firm and stable, improving the strength of the convex die, preventing the breakage of the convex die and changing the force state of the blank during punching.
Punching processing Punching processing
The ratio of punching diameter to material thickness in stamping can reach the following values: 0.4 for hard steel, 0.35 for soft steel and brass, and 0.3 for aluminum.
When punching a small hole in a plate, when the material thickness is greater than the die diameter, the punching process is not a shearing process, but a process of squeezing the material through the die into the concave die. At the beginning of extrusion, part of the punched scrap is compressed and squeezed into the surrounding area of the hole, so the thickness of the punched scrap is generally less than the thickness of the raw material.
When punching small holes in the stamping process, the diameter of the punching die is very small, so if the ordinary method is used, the small die will break easily, so we try to improve the strength of the die to prevent it from breaking and bending. The methods and attention should be paid to the following.
1, the stripper plate is also used as a guide plate.
2, the guide plate and the fixed working plate are connected with a small guide bush or directly with a large guide bush.
3, the convex die is indented into the guide plate, and the distance between the guide plate and the fixed plate of the convex die should not be too large.
4, The bilateral clearance between the convex die and the guide plate is less than the unilateral clearance of the convex and concave die.
5, The pressing force should be increased by 1.5~2 times compared with the simple dematerialization.
6, The guide plate is made of high hardness material or inlay, and it is 20%-30% thicker than usual.
7, the line between the two guide pillars through the workpiece pressure in xin.
8, multi-hole punching, the smaller diameter of the convex die than the larger diameter of the convex die lower a material thickness.
Post time: Sep-17-2022