How to ensure high accuracy of micro-milling process in precision parts machining?

In the field of precision parts machining, it is crucial to control the high accuracy of the micro-milling process. To achieve this, a number of key elements need to be considered from all angles.

The basis for this is the proper selection and maintenance of tools. Micro-milling tools need to be extremely accurate and wear-resistant. Carbide tools are preferred because of their excellent hardness and wear resistance. The cutting edge quality of the tool is the most important thing, the smallest cutting edge defects may be magnified in the machining, affecting the accuracy.

Optimisation of cutting parameters is the core link to improve accuracy. Cutting speed should be set accurately according to the material characteristics. Take stainless steel as an example, too high a cutting speed is easy to cause chip tumour, damaging the surface quality; too low is inefficient, and may affect the accuracy due to unstable cutting force.

Stable control of the machining environment is indispensable. Temperature fluctuations will cause parts and tools to expand and contract, which will have a serious impact on machining accuracy. Workshops should be equipped with high-precision thermostat systems to keep temperature variations to a very small range, such as ±1°C. At the same time, humidity should be strictly controlled. At the same time, the humidity also needs to be strictly controlled, too high or too low humidity may trigger parts surface oxidation, rust or deformation, the ideal humidity range should be maintained between 40% - 60%.

High precision and stability of machine tools are guaranteed. The positioning accuracy and repeatability of the machine directly determine the machining accuracy. Regularly use the laser interferometer to test and calibrate the positioning accuracy of each axis of the machine tool, and compensate for errors in time.

Real-time monitoring and error compensation during machining is a powerful means to improve accuracy. With the help of force sensors, vibration sensors and other equipment, real-time monitoring of cutting force, vibration and other parameters. Once abnormal parameters are found, the cause is immediately analysed and corresponding measures are taken, such as adjusting cutting parameters and replacing tools.