1. Preparation:
Before machining the key surface, the finish datum shall be trimmed once to ensure the machining accuracy of the key surface.
2. Surface treatment:
After finishing the datum, then process each key surface with high precision and carry out rough machining, semi finish machining and finish machining. The machining accuracy of CNC precision parts stipulates that the surface with very high machining accuracy must also be polished.
3. Benchmark before others:
The surface as the precision benchmark should be processed at the beginning of the whole process of CNC processing, because it should be used to accurately locate other surfaces in the later process. That is "benchmark before others".
4. Precise positioning:
When machining the precision datum, the coarse datum must be used for accurate positioning. In loose parts, small batch manufacturing, and even mass production, for castings and steel castings with miscellaneous appearance or large standard, and rough embryos with large standard deviation, the drawing process should be allocated in the machining process of mechanical equipment at the earliest time, so as to produce the alignment reference for precision machining.
5. Process flow:
For processes that are prone to waste, finishing and finishing can be appropriately put in the front, and some primary and secondary small appearance processing can be put in the back.
Precision die casting:
It is an advanced forming technology of precision metal parts. In detail, it refers to the use of heat, force, molecular motion and other means to make liquid or semi liquid metal or metal alloy fill the mold cavity at a high speed under the action of force, form and condense to obtain metal structural parts, and then after post-processing and NC finishing, finally make the product size Precision manufacturing technology whose shape and performance can meet the target requirements.
6. Processing method:
Precision casting, CNC cutting, abrasive belt polishing, precision polishing, EDM, WEDM, etc.