Modern files are generally made of carbon steel by rolling, forging, annealing, grinding, cutting teeth and quenching. The file is made of t12 steel, which has a hardness of 62~64 after surface quenching.
The file is made of carbon tool steel T12 or T13 after heat treatment, and then the working part is quenched. It is a small production tool. It is a hand tool for filing the workpiece. Used for micro processing of metal, wood, leather and other surface layers.
There are many fine teeth and strips on the surface of the file, which are hand tools used to file the workpiece. Used for micro processing of metal, wood, leather and other surface layers.
There are many varieties of files.
①According to the purpose, there are:
Ordinary fitter files, used for general filing processing;
Wooden files, used to file soft materials such as wood and leather;
Plastic files (assorted files) are used for filing small and fine metal parts. There are many files with various cross-sectional shapes to form a set;
Sharpening the files for woodworking saws;
Special files, such as flat and arch shaped files (special files) for repairing special shapes, are available in straight and curved shapes.
②Files are classified into Flat Files, Square Files, Half Round Files, Round Files, Triangular Files, Diamond Files and Knife Files according to their cross-sectional shapes (see picture). Flat files are used to file flat, cylindrical and convex arc surfaces; square files are used to file square holes, rectangular holes and narrow flat surfaces; triangular files are used to file internal corners, triangular holes and flat surfaces; semicircular files are used to file concave arcs. And flat surfaces; round files are used to file round holes, concave arcs and ellipses with smaller radius.
③Files are divided into single-grain files and double-grain files according to the file pattern. The teeth of the single-grain file are inclined at an angle to the axis, which is suitable for processing soft non-ferrous metals; the main and secondary file patterns of the double-grain file are arranged in a crossed manner for processing steel and non-ferrous metals. It can divide wide filings into many small sections, making filing relatively brisk.
④Files are divided into No. Ⅰ～Ⅴ according to the number of main file lines per 10 mm length. No. Ⅰ is Bastard for coarse tooth file, No. Ⅱ is second for middle tooth file, No. Ⅲ is smooth for fine tooth file, No. It is a gloss file, which is used for roughing and finishing respectively. The diamond file has no file pattern, but a layer of diamond powder is plated on the surface of the file to file hardened metal.
⒈File body: the part between the tip of the file and the shoulder of the file is the file body. For a plastic file without a shoulder, the file body refers to the part with file lines.
⒉File handle: the part other than the file body.
⒊The parallel part of the file body: the part where the generatrix of the file body is parallel to each other is the file body parallel part.
⒋ Tip: the part between the starting point and the tip where the cross-sectional size of the file body begins to gradually decrease. (Length of the file body = tip length + parallel part of the file body)
⒌Main file pattern: The file pattern that plays the main cutting role on the working surface of the file is the main file pattern.
6. Auxiliary file pattern: The file pattern covered by the main file pattern is the auxiliary file pattern.
⒎Edge file pattern: The file pattern on the narrow or narrow side of the file is the edge file pattern.
⒏Main (auxiliary) filing angle λ(ω): The acute angle between the main (auxiliary) filing pattern and the axis of the file body is the main (auxiliary) filing angle λ(ω).
⒐Edge filing angle θ: The acute angle between the edge filing pattern and the axis of the file body is the edge filing angle θ.
⒑ Number of file lines: The number of file lines per 10mm in the axial direction of the file is the number of file lines.
⒒ File tooth bottom line: In the normal vertical section of the main file pattern, the straight line passing through the two adjacent tooth bottoms is the tooth bottom line.
⒓Tooth height: The distance between the top of the tooth and the bottom of the tooth is the tooth height.
⒔Tooth rake angle: The tooth rake angle is the acute angle between the intersection of the cutting edge surface of the file tooth and the normal surface relative to the vertical line connecting the tooth bottom.