A punching process for high-brightness and high-precision circular hole accessories

Abstract

The invention relates to a high-brightness-zone and high-precision circular hole accessory blanking process, and belongs to the technical field of blanking. The high-brightness-zone and high-precision circular hole accessory blanking process comprises the following steps: step 1, pressing a blank on a concave die under pressure, and carrying out blanking on the blank at the position where a punch is distant from the appearance of a product by 0.4 Tmm, wherein the bottom of the punch is not subjected to rounding; step 2, carrying out blanking under the condition that the punch is located at a contour line of the product, wherein the bottom of the punch is not subjected to rounding, and the diameter of the punch is greater than that of the concave die by the size which is equal to 0.1-0.2 times of the thickness of the blank; and step 3, controlling the punch not to enter a cavity of the concave die in a blanking stage, and pressing the material of a previous machined blank into the concave die by using a later machined blank, wherein the punch and the cavity of the concave die are cylindrical, in the stage, the concave die is changed, the double-faced clearance between the punch and a new concave die is smaller than 0.01-0.02 mm, and the punch has fillet so that a whole brightness zone is implemented. The brightness zone can be improved by 100%, and therefore, high-quality punching parts which have dimensional precision higher than that of common blanked parts, have bright and clean blanked surfaces, and are small in corner collapse and good in interchangeability are obtained.

Description

technical field [0001] The invention relates to a punching process of high-brightness and high-precision circular hole fittings. The circular hole fittings are used on parts with bearings, usually on automobiles, ships and mechanical mechanisms, and belong to the field of blanking technology . Background technique [0002] With the rapid development of stamping technology, stamping products are widely used in aerospace, automobile, machinery, electronics, medical and other fields, and people's requirements for stamping products are getting higher and higher. In the section of the blanking part, the wider the bright band, the better the quality of the section. In many cases, the section of the blanking part is required without affecting the size and appearance of the product without affecting the manufacturing cycle and increasing the manufacturing cost. Hit to 100% light band. Ordinary blanking has great defects on the sagging surface and the burr surface, and cannot achie...

AI Technical Summary

Problems solved by technology

Ordinary blanking has great defects on the sagging surface and the burr surface, and cannot achieve 100% bright zone. The proportion of the bright zone area in the cross-sectional area depends on the performance of the material, the mold gap, the state of the knife edge, etc. The difference produces different changes, and the full-bright belt product is a technical problem that needs to be solved

[0003] In addition, the publication number is "CN201410657465.4, a continuous die secondary punching process for chain parts" invention patent, which adopts punching, extrusion, and finishing methods to process circular hole parts, punching bright belts Can only reach 85%, cannot reach 100% bright band

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