CN105014002A - Manufacturing method of miniature steel balls - Google Patents

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

Miniature iron shot manufacture method

Technical field

The present invention relates to a kind of manufacture method of steel ball, specifically, is the method for the small steel ball of a kind of manufacturing dimension.

Background technology

Steel ball can be divided into application to pulverize industrial abrasion-proof steel ball and apply the large class of the industrial bearing steel ball two of precision bearing, bearing steel ball uses with a long history in precision bearing industry and sphere of life, use more extensive, can say that major part has the place of rotation just to have the existence of steel ball, be commonly called as steel ball, ball.

Current steel ball blank processing mode mainly contains cold-heading and blank two kinds, due to dimensional parameters and the machining accuracy problem of cold headers, current header system can only process the large gauge steel ball of diameter 3 more than ㎜, processing diameter is needed to be less than the miniature iron shot of below 3mm, blank mode can only be adopted, namely first raw material is cut off, carry out filing processing again and make blank section subglobular, then grinding is carried out, this processing mode, this blank shape of blank section is cylinder, be processed into high-precision steel ball, irregular part is just needed to grind off, because this blank aspheres part is more larger, allowance is huge, so the part ground off is also more, thus have lost very many raw materials, and the steel ball internal fiber tissue looseness that blank is shaping, discontinuous, bearing capacity is poor, life-span is short.

Summary of the invention

The present invention is directed to above-mentioned the deficiencies in the prior art, devise a kind of new miniature iron shot manufacture method.

Miniature iron shot manufacture method of the present invention, by the inspection of raw and process materials carried out successively, cold-heading, photosphere, heat treatment, hard grind, strengthen, sort, early grind, lappingout, photoelectricity choosing, packaging step form, cold-heading adopts hole, φ 0.7 ㎜ little pole technique, cold-heading polar diameter is 0.7mm or 0.8mm, cold-heading allowance is 0.30 ㎜, cold-heading centering error is 0.04mm, and cold-heading blank diameter is 1.4mm or 1.7mm.

The invention has the beneficial effects as follows: miniature iron shot manufacture method adopts the mould of φ 0.7 ㎜ little pole hole technique and corresponding size specification, the miniature iron shot making cold headers can process diameter to be less than below 3mm, utilize the mode of cold-heading to process, the shape of ball base is close to pure circle, and the part that needs grind away is few, centering error is 0.04mm, allowance is very little, and significant loss is less, thus reduces production cost, and photosphere process time after shortening cold-heading, improve the existence efficiency of steel ball processing; Due to cold-heading operation, by raw material upsetting pressure balling-up base, steel ball internal fiber tissue tight, coherent, so steel ball bearing capacity is strong, long service life.

Accompanying drawing explanation

Accompanying drawing 1 is process chart of the present invention.

Detailed description of the invention

Miniature iron shot manufacture method of the present invention, as shown in Figure 1, by the inspection of raw and process materials carried out successively, cold-heading, photosphere, heat treatment, hard grind, strengthen, sort, early grind, lappingout, photoelectricity choosing, packaging step form.

Cold-heading adopts hole, φ 0.7 ㎜ little pole technique.

Cold-heading polar diameter is 0.7mm or 0.8mm,

Cold-heading allowance is 0.30mm, and cold-heading centering error is 0.04mm.

Cold-heading blank diameter is 1.4mm or 1.7mm.

Claims (1)

1. a miniature iron shot manufacture method, it is characterized in that, by the inspection of raw and process materials carried out successively, cold-heading, photosphere, heat treatment, hard grind, strengthen, sort, early grind, lappingout, photoelectricity choosing, packaging step form, cold-heading adopts hole, φ 0.7 ㎜ little pole technique, cold-heading polar diameter is 0.7mm or 0.8mm, cold-heading allowance 0.30mm, the centering error of the upper and lower mould of cold headers is 0.04mm, and blank diameter is 1.4mm or 1.7mm.