Classification of machining
Mechanical processing mainly includes manual processing and numerical control processing. Manual processing refers to the method of processing various materials through the manual operation of milling machines, lathes, drilling machines, sawing machines and other mechanical equipment by mechanical workers. Manual processing is suitable for small batch and simple parts production. Numerical control machining (CNC) refers to the use of numerical control equipment by mechanical workers to process, including machining centers, turning and milling centers, WEDM equipment, thread cutting machines, etc. NC machining processes workpieces in a continuous way, which is suitable for large quantities of parts with complex shapes.
Technical requirements for machining
1. Tolerance requirements
(1) The unmarked shape tolerance shall meet the requirements of gb1184-80.
(2) The allowable deviation of unmarked length and dimension is ± 0.5mm.
(3) The casting tolerance zone is symmetrical to the basic dimension configuration of the blank casting.
2. Requirements for machined parts
(1) The parts shall be inspected and accepted according to the process, and the next process can be carried out only after the previous process is qualified.
(2) The machined parts are not allowed to have burrs.
(3) The finished parts shall not be placed directly on the ground, and necessary support and protection measures shall be taken. The machined surface shall be free of rust and other defects such as bumps and scratches that affect performance, service life or appearance.
(4) There shall be no peeling on the surface after rolling and finishing.
(5) The surface of parts after heat treatment in the final process shall be free of oxide skin. The mating surface and tooth surface after finishing shall not be annealed
(6) The machined thread surface is not allowed to have defects such as black skin, bump, disorderly buckle and burr.
Operators can better reduce errors in machining by understanding the classification of machining process and the technical requirements of machining process. Yuntuo machine processing is a large-scale machine processing plant specializing in large-scale high-precision hardware parts, such as large-scale frame welding processing, large-scale CNC gantry milling processing, large-scale mechanical plate processing, large-scale precision CNC lathe processing, horizontal CNC processing, precision mechanical parts processing, chassis sheet metal processing, hardware stamping processing and so on.
