Influence of tool accuracy on machining

Influence of tool accuracy on machining

Firstly ,tools have dimension Tolerance when produce.

Tool tolerance standards vary depending on the type and use of the tool. In general, the size of the tool tolerance will directly affect the insertion accuracy and stability of the tool. In machine tool machining, the size of tool shank tolerance also needs to be determined according to the specific machining requirements and circumstances.

Common tool tolerance standards are as follows:

1. Diameter tolerance: the tolerance of tool diameter is usually expressed using the IT (International Tolerance Level) system, with common values such as IT7, IT8, IT9 and so on. In addition, according to specific applications and requirements, the diameter tolerance is usually between 0.01~0.03mm.

2. Length tolerance: The length tolerance is usually expressed by tolerance band, and the common values are H7, H8, H9, etc. The length tolerance is usually ±0.03mm. The length tolerance is usually between ±0.05mm.

3. Roundness tolerance: Roundness tolerance refers to the allowable error range of the shank surface, and the common values are generally between 0.01~0.02mm.

The accuracy of the tool has a direct impact on the machining accuracy of the workpiece. High-precision tools can ensure that the dimensional and form tolerances of the parts are within the permissible range,so we 'd better choose the just right tools before machining.

Sencondly,tool wear will happen in production.

While high-quality tool materials can reduce the wear and tear in the machining process and ensure the surface finish of the parts. 

In particular, the dimensional accuracy of fixed-size tools (such as drills, reamers, etc.) directly affects the dimensional accuracy of the workpiece. While the shape accuracy of forming tools affects the shape accuracy of the workpiece. In addition, the general manufacturing accuracy of the tool has no direct impact on the machining accuracy, but its wear will cause the size and shape of the workpiece error, so in the CNC turning process, we need consider the tool wear compensation to ensure the dimension accuracy of the parts.