Reasonable selection of files has a great impact on improving file efficiency, ensuring file quality, and extending file life. Each file has its own purpose, and you must carefully choose the right file before filing. If it is not properly selected, it will not be able to give full play to its effectiveness or lose its cutting ability prematurely, and cannot guarantee the quality of the file.
The correct selection of the file should be considered according to the specific conditions of the processing object from the following aspects:
(1) The cross-sectional shape of the file should match the shape of the workpiece.
(2) Rough files are used for rough machining, and fine files are used for finishing. The coarse file is suitable for filing workpieces with large machining allowance, low machining accuracy and large surface roughness value; the fine file is suitable for filing workpieces with small machining allowance, high machining accuracy and small surface roughness value; single tooth file Suitable for processing soft materials.
The choice of file thickness depends on the nature of the workpiece material, the size of the machining allowance, the processing accuracy and the surface roughness requirements, the hardness of the workpiece material, etc. Rough file (or single-tooth file) is suitable for filing workpieces with large machining allowance, low machining accuracy and large surface roughness, and filing copper, aluminum, etc. due to the large tooth pitch and large chip space. Soft metal material; fine file is suitable for filing workpieces with small machining allowance, high machining accuracy and small surface roughness value, and filing steel, cast iron, etc .; polished files are used for final finishing and polishing the surface of the workpiece to improve Dimensional accuracy reduces roughness.
(3) The length of the file should generally be 150 to 200 mm longer than the filed surface. The size of the file size depends on the size of the workpiece processing surface and the size of the machining allowance. When the size of the processing surface is large and the machining allowance is also large, a longer file should be used; otherwise, a shorter file should be used. The length of the file should generally be 150 to 200 mm longer than the filed surface.
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