A non-continuous point blank holder for a fine blanking die and its process parameter design method

Abstract

The invention discloses a discontinuous point type blank holder for a fine blanking die and a design method of technological parameters of the discontinuous point type blank holder. The blank holder comprises a point type blank holder body, wherein a group of raised points are uniformly distributed on the lower surface of the point type blank holder body along the shape contour of a part required to be formed through fine blanking; rounded corners are arranged on the raised points; when the thickness of the part required to be formed through fine blanking is smaller than 5 mm, the point type blank holder is single-sided, and the technological parameters are determined; and when the thickness of the part required to be formed through fine blanking is larger than or equal to 5 mm, a group of raised points which have the same parameters with the raised points on the point type blank holder body are arranged on the upper surface of the fine blanking die, and the technological parameters are determined. According to the design method, aimed at fine blanking parts with different thicknesses, the technological parameters of the discontinuous point type blank holder can be effectively determined, the discontinuous point type blank holder can be widely applied to fine blanking, the cost of the fine blanking die is reduced, and the perfectness ratio of the surfaces of the parts is increased.

Description

technical field [0001] The invention specifically relates to a non-continuous point-type blank holder of a fine blanking die and a method for designing process parameters thereof. Background technique [0002] Fine blanking is a high-quality, high-efficiency, low-consumption forming technology, which has been widely used in industry. Compared with the ordinary blanking die structure, the fine blanking die structure increases the blank holder and the back pressure plate, and has a smaller The gap between the convex and concave dies. During the blanking process, the blank holder first presses the material, and then when the punch is pressed down, the counter pressure plate provides counter pressure, so that the metal in the shear zone is in a state of three-way hydrostatic stress for blanking. Obtain blanked parts with good surface quality. [0003] The blank holder is an indispensable part of the fine blanking die, which can prevent the material outside the shear zone from ...

AI Technical Summary

Problems solved by technology

However, when different parts are fine blanked, how to select the parameters of the non-continuous point blank holder has not yet been systematically defined.

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