An Optimally Designed Small Edge Large Thickness Smooth Fine Blanking Die

Abstract

The invention discloses a small scrap and large thickness smooth and clean fine stamping die designed optimally. The small scrap and large thickness smooth and clean fine stamping die designed optimally comprises a female die, a projected pressure plate, a male die and a reverse pressure plate; the thickness of a blank is equal to t; an annular plunger stage is arranged on the circumference of a cutting edge of the top surface of the female die, and difference between radiuses of an outer ring and an inner ring of the plunger stage is equal to 30%t; the distance between the surface of the plunger stage and the upper surface of the female die is 1.5% t mm; a circular truncated cone is arranged on the bottom surface of the projected pressure plate, and a round opening which penetrates through the top surface of the projected pressure plate is formed in the bottom surface of the circular truncated cone; difference between radiuses of an outer ring and an inner ring of an annular plane of the bottom surface of the circular truncated cone is equal to 30% t, an included angle between a generatrix of the circular truncated cone and the projected pressure plate is equal to 45 degrees, and the projected height of the circular truncated cone is equal to 60% t; when the male die is assembled, the bottom surface of the male die retracts into the bottom surface of the circular truncated cone by 0.5 mm, and the fit clearance between the circumferential surface of the male die and the projected pressure plate and the fit clearance between the circumferential surface of the reverse pressure plate and the female die of the plunger stage are 0.01 mm; and when the reverse pressure plate is assembled, the top surface of the reverse pressure plate is higher than the bottom surface of the plunger stage by 0.2 mm. Thick plates and quite small scraps can be finely stamped smoothly, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of fine blanking, and relates to an optimally designed smooth fine blanking die with small overlap and large thickness. Background technique [0002] Fine blanking is a precision stamping process based on ordinary blanking to manufacture stamped parts with precise dimensions and shapes. In the prior art, various fine blanking methods are mainly classified according to their process methods as figure 1 As shown, the traditional and currently commonly used fine blanking methods are not fine blanking in the general sense (such as trimming, smooth blanking and high-speed blanking, etc.), but strong edge blanking. [0003] The basic principle of strong edge blanking is to use a special (three-way force) press, with the help of a special structure mold, under the action of strong force, to make the material produce plastic-shear deformation, so as to obtain high-quality fine blanking parts. However, it can be se...

AI Technical Summary

Problems solved by technology

[0005] The bright and clean fine blanking die device using this technology solves the problem of relatively thick sheet metal smooth and clean fine blanking, and has made great technological progress. Of course, it can be used, but there are more edge scraps and a greater waste of materials. , the effect is not ideal enough

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