Machined parts are mechanical parts that are processed and shaped by various mechanical processing equipment, mainly in a way that no chemical reaction (or a very small reaction) occurs. There are two main categories of mechanical machining: manual machining and CNC machining.
Manual processing refers to the method of processing various materials through mechanical equipment such as milling machines, lathes, drilling machines and saws operated manually by mechanical workers. Manual machining is suitable for small batch and simple parts production.
CNC machining refers to machining by machinists using CNC equipment, including machining centers, turning and milling centers, EDM wire cutting equipment, thread cutting machines, etc. CNC machining processes workpieces in a continuous manner and is suitable for high volume, complex shaped parts.
Technical requirements of machining
1、Tolerance requirements
(1) unnoticed shape tolerance should be consistent with the requirements of GB1184-80.
(2) uninjected length size deviation allowed ± 0.5 mm.
(3) casting tolerance zone symmetry in the basic size configuration of the blank casting.
2, cutting processing parts requirements
(1) parts should be checked and accepted according to the process, in the previous process after passing the inspection, before moving to the next process.
(2) after processing the parts are not allowed to have burrs.
(3) after finishing parts shall not be placed directly on the ground, should take the necessary support, protection measures. Processing surface
is not allowed to have rust and affect the performance, life or appearance of the bump, scratch and other defects.
(4) rolling finishing surface, after rolling shall not have the phenomenon of peeling.
(5) the final process after heat treatment of the parts, the surface should not have oxide skin. After finishing with the surface, the tooth surface should not be annealed
(6) The processed thread surface shall not have defects such as black skin, bumping, messy buckle and burr.
