File is the main tool for filing, generally made of carbon tool steel T 12 or T 13. After heat treatment and quenching, the hardness of the cutting piece reaches above 62HRC.
(2) File structure: A file is mainly composed of a file body and a file handle. File face is the main working face of file. There are many teeth on the surface of the file. When filing, each file tooth is equivalent to the chisel cutting material, and the file pattern is the pattern of regular arrangement of file teeth. Add Bian Xiao WeChat Yuki7557 to get 10G CNC course, and the file tooth pattern can be divided into single tooth pattern and double tooth pattern. Single tooth pattern has only one direction, and is often used to file soft materials such as aluminum and copper. Double tooth pattern has two directions, shallow tooth pattern is called bottom tooth pattern, and deep tooth pattern is called face tooth pattern, which is suitable for filing hard materials.
Second, the classification of documents
Files are divided into ordinary files, plastic files (or classified files) and special files according to their uses. Among them, ordinary files are the most commonly used.
(1) ordinary file. Ordinary files can be divided into five types according to their cross-sectional shapes: flat files, semi-circular files, square files, triangular files and round files. These files are mainly used by locksmiths in their daily processing, as shown in the following figure.
Flat file is used for: filing flat surface and outer curved surface;
Square file is used for: filing grooves and square holes;
Triangular file is used for: filing triangular groove, larger than 60. Inner corner surface;
Semi-circular files are used for; File inner curved surface and large round hole;
Circular file is used to file round holes and small radius inner round holes.
(2) Plastic file (assorted file). It is mainly used for finishing and trimming small parts that are difficult to machine on the workpiece. It consists of several files with different cross-sectional shapes.
(3) Special files. There are two kinds of special surfaces used for machining parts, linear and curved, and their cross-sectional shapes are many.
III. Specifications and Selection of Documents
File specifications: There are two types of file specifications: one is file size specifications. This specification stipulates that: the dimensions and specifications of square documents are expressed in square dimensions; The size specification of circular file is expressed by diameter; Other files are expressed by the length of the file body, and the common file body length is100 ~ 400 mm. The second is the thickness specification of the file tooth pattern. This specification stipulates that the file has the number of main file lines per 10mm axial length, and the main file lines refer to the tooth lines that play the main cutting role on the file; The tooth type that plays the role of typing in another direction is called auxiliary tooth type.