There are many types of files.
â‘ According to the use: ordinary fitter files, used for general file processing; wooden files, used to file soft materials such as wood and leather; plastic files (assorted files), used to file small and fine metal parts There are many files with various cross-sectional shapes; a file for sharpening woodworking saws; special files, such as flat and arched special files (special files) for special shapes, which are straight and curved. .
â‘¡The files are divided into flat files (flat files), square files, semicircular files, round files, triangular files, diamond files and knife files, etc. according to the cross-sectional shape (see figure). Flat file is used to file plane, outer round surface and convex arc surface; square file is used to file square hole, rectangular hole and narrow plane; triangular file is used to file inner corner, triangular hole and plane; semicircular file is used to file concave arc surface And flat surface; round file is used to file round holes, concave arc surfaces with small radius and elliptical surfaces.
â‘¢ According to the file pattern, the file is divided into single file and double file. The teeth of the single-line file are inclined at an angle to the axis and are suitable for processing soft non-ferrous metals; the main and auxiliary files of the double-line file are arranged in a cross pattern and are used to process steel and non-ferrous metals. It can divide the wide file into many small segments, making the file easier and faster.
â‘£The file is divided into No. â… to â…¤ according to the number of main file lines per 10 mm length. No. â… is coarse tooth file, No. â…¡ is medium tooth file, No. â…¢ is fine tooth file, No. â…£ and No. â…¤ are oil polish files. , For roughing and finishing, respectively. Diamond files do not have file lines, but only a layer of diamond powder is plated on the surface of the file to file hardened metal.
When storing the file: avoid water, oil or other dirt, do not overlap or pile up with other hard tools, keep the surface of the file clean, and store it in a dry place! Generally, yellowing and rusting will not occur within two years. (The premise is that the files you use are generally small file manufacturers that have undergone anti-rust treatment. They do not have file anti-rust treatment capabilities, or only have a part of them.) The conventional file anti-rust method is carried out according to the following steps:
(1) Put the quenched file in hot acid and heat it for 2 hours, (2) Then transfer it to cold acid and infiltrate for 24 hours, (3) Remove it and do the surface blasting treatment (4) Finally, pass the anti-rust oil and control to dry until packaging.
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