The specification of special-shaped file and plastic file refers to the full length of the file.
The assembler files the body (the distance from the file tip to the file shoulder). In terms of length, there are several specifications: 100 ~ 150 mm, 200-300mm and 350-450 mm
The full length of special-shaped files and plastic files are specifications. The basic dimensions of a file mainly include width and thickness. For circular files, diameter.
Main parameters of file mode
(1), locksmith file
File number-parameter indicating the thickness of file teeth. According to the number of main gears within the axial length of 10mm, there are five types, namely 1, 2, 3, 4 and 5. The smaller the file number, the thicker the file teeth.
(2), special-shaped file
The document number-* * * is divided into ten types: 00, 0, 1, 2...8.
File selection principle file
1, the choice of file section shape
The cross-sectional shape of the file should be selected according to the shape of the parts to be filed, so that the shapes of the two can be adapted. When filing the inner cambered surface, choose semi-circular file or circular file (small diameter workpiece); When filing the inner corner surface, choose a triangular file; When filing the inner right angle surface, you can choose a flat file or a square file. When selecting the inner right angle face of flat file, pay attention to make the narrow face (smooth edge) of the file toothless close to the side of the inner right angle face so as not to hurt the right angle face.
2, the choice of file tooth thickness
The thickness of the file tooth should be selected according to the allowance size, machining accuracy and material properties of the machined workpiece. Coarse tooth file is suitable for workpieces with large machining allowance, low dimensional accuracy, large form and position tolerance, large surface roughness and soft materials. Instead, choose a fine tooth file. When used, it should be selected according to the machining allowance, dimensional accuracy and surface roughness required by the workpiece.
3. Selection of file size specifications
The size and specification of the file should be selected according to the size and machining allowance of the workpiece to be machined. When the machining size is large and the allowance is large, the file with large size should be selected, otherwise, the file with small size should be selected.
4, the choice of file tooth line
The file tooth pattern should be selected according to the properties of the workpiece material to be filed. When filing soft materials such as aluminum, copper and low carbon steel, it is best to choose a single tooth pattern (milling tooth) file. Single-tooth file has the advantages of large rake angle, small wedge angle, large chip groove, difficult chip blocking and sharp cutting edge.