Precision parts processing produces parts from materials and processes, which are very precise processes. The workpiece processing requirements in precision machining generally require precision machining of parts in the form of numerical control. Its specific accuracy is reflected in the following 4 points:

1.  Dimensional accuracy
   The degree of conformity between the actual size of the processed part and the centre of the tolerance zone of the part size.

2. Shape accuracy
   The degree to which the actual geometry of the machined part surface conforms to the ideal geometry.

3. Position accuracy
   The actual positional accuracy difference between the relevant surfaces of the part after machining.

4. Interrelationships
   Usually, when designing machine parts and specifying the machining accuracy of parts, attention should be paid to controlling the shape error within the position tolerance, and the position error should be smaller than the dimensional tolerance. That is to say, for precision parts or important surfaces of parts, the shape accuracy requirements should be higher than the position accuracy requirements, and the position accuracy requirements should be higher than the dimensional accuracy requirements.

The processing flow of high-precision machining parts

1. Review the project and select the appropriate processing technology

   During your free manufacturing consultation, our engineer experts will review your project; the process will be discussed with you. We will gain an in-depth understanding of your part and its application and collect the data we need to select the appropriate machining process and materials. We may ask the following questions:

   • What temperature will the part be exposed to?
   • What force will the part be subjected to?
   • Will the part be exposed to liquids or gases?
   • What is the role of the parts?

2. . After you confirm the order, we will formulate a suitable machining plan for CNC machining of precision parts for your parts, analyze the drawings of the parts to be machined, process the parts and adopt appropriate machining techniques for the machining content of the parts.

   CNC precision machining mainly includes precision turning, precision milling, precision grinding and other processes. Usually, these processes are combined in the processing of a part:

• Precision turning: Most of the precision light alloy (aluminum or magnesium alloy, etc.) parts in the aircraft are processed by this method. Generally, a natural single crystal diamond tool is used, and the radius of the blade arc is less than 0.1 microns; when processed on a high-precision lathe, an accuracy of 1 micron and a surface unevenness with an average height difference of fewer than 0.2 microns can be obtained, and the coordinate accuracy can reach ±2 microns.
• Precision milling: used for processing aluminum or beryllium alloy structural parts with complex shapes. Relying on the precision of the machine tool’s guides and spindles to obtain high mutual positional accuracy, high-speed milling with carefully ground diamond tips can achieve precise mirror surfaces.