Manufacturing method of miniature steel balls

Abstract

The invention provides a manufacturing method of miniature steel balls. The manufacturing method sequentially comprises the steps of raw material inspection, cold heading, ball polishing, heat treatment, hard grinding, strengthening, grading, primary grinding, precise grinding, photoelectric selection and packaging, wherein in the cold heading step, a phi 0.7 mm small pole hole technology is adopted, and the diameter of each cold headed pole is 0.7 mm or 0.8 mm; the cold heading allowance is 0.30 mm, and the cold heading eccentric error is 0.04 mm; and the cold heading blanking diameter is 1.4 mm or 1.7 mm. According to the manufacturing method of the miniature steel balls, the phi 0.7 mm small pole hole technology and a mold of a corresponding dimension are adopted so that a cold heading machine can machine miniature steel balls with the diameters being smaller than 3 mm. Because the cold heading machining manner is adopted, the shape of each ball blank is approximately round, and few parts need to be ground off. Because the eccentric error is 0.04 mm, the machining allowance is quite small, and raw material loss is small. In this way, the production cost is reduced, the time of ball polishing conducted after cold heading is shortened, and the steel ball machining efficiency is improved.

Description

technical field [0001] The invention relates to a method for manufacturing a steel ball, in particular, a method for manufacturing a steel ball with a small size. Background technique [0002] Steel balls can be divided into two categories: wear-resistant steel balls in the crushing industry and bearing steel balls in the precision bearing industry. Bearing steel balls have a long history of use in the precision bearing industry and the field of life, and are more widely used. Where there is rotation, there are steel balls, commonly known as steel balls and rolling balls. [0003] The current steel ball billet processing methods mainly include cold heading and cutting. Due to the size parameters and processing accuracy of the cold heading machine, the current cold heading method can only process large-sized steel balls with a diameter of 3mm or more. For miniature steel balls smaller than 3mm, only the cutting method can be used, that is, the raw material is cut off first, ...

AI Technical Summary

Problems solved by technology

[0003] The current steel ball billet processing methods mainly include cold heading and cutting. Due to the size parameters and processing accuracy of the cold heading machine, the current cold heading method can only process large-sized steel balls with a diameter of 3mm or more. For miniature steel balls smaller than 3mm, only the cutting method can be used, that is, the raw material is cut off first, and then the cutting process is carried out to make the cutting section close to the spherical shape, and then the grinding process is carried out. This processing method, the blank of the cutting section The shape is a cylinder, and the irregular parts need to be ground off when processed into high-precision steel balls. Since the non-spherical parts of this kind of billet are large and the machining allowance is huge, there are also many parts to be ground off, thus A lot of raw materials are lost, and the internal fiber structure of the steel ball formed by cutting the material is loose and incoherent, with poor pressure bearing capacity and short service life

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