The file is made of carbon tool steel T12 or T13 after heat treatment and then partially quenched. Files can be divided into three types: ordinary file, special file and shaping file (assorted brocade file); ordinary file can be divided into five types: flat file, square file, triangular file, semi-circular file and circular file according to the shape of the cross-section of the file. Flat file is used to file plane, outer circle and convex arc surface; square file is used to file square hole, rectangular hole and narrow plane; triangular file is used to file inner angle, triangular hole and triangular hole. A semi-circular file is used to file concave arcs and planes; a circular file is used to file circular holes, small radius of concave arcs and elliptical surfaces; a special file is used to file special surfaces of parts, both straight and curved; a shaping file (assorted brocade file) is used to trim small parts of the workpiece, and a set of files with many cross-section shapes.
The file is divided into two types: single file and double file. The teeth of a single-grain file are inclined at an angle to the axis, suitable for processing soft non-ferrous metals; the main and secondary filings of a double-grain file are arranged crosswise, used for processing steel and non-ferrous metals. It can divide the wide file into many segments, so that the file is lighter. Files are divided into I-V according to the number of main filing lines per 10 mm length, of which I is coarse-tooth file, II is medium-tooth file, III is fine-tooth file, IV and V are oil-polished files, respectively, for rough processing and finishing.
Ordinary file is made of steel into a file shape, annealing, so that the steel becomes soft, engraved pattern, then quenched, so that the surface becomes very hard, then into a file. Diamond file is a kind of electrodeposition technology, which is used to electroplate natural diamond on the substrate (billet). It has the characteristics of high efficiency, low cost and good economic effect. It can be used to file hard materials.
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