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What are the classifications of machining?

by:Foxron     2021-11-28
Machining parts are mechanical parts processed by various mechanical processing equipment, mainly referring to processing methods that do not undergo chemical reactions (or reactions are very small). There are two main types of mechanical processing: manual processing and numerical control processing.


Manual processing refers to the method of processing various materials by manual operation of mechanical equipment such as milling machines, lathes, drilling machines, and sawing machines 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 for machining by mechanical workers. These numerical control equipment includes machining centers, turning and milling centers, wire EDM equipment, thread cutting machines, etc. CNC machining processes workpieces in a continuous manner, which is suitable for large-volume, complex-shaped parts.


Technical requirements for machining


1. Tolerance requirements


(1) The unmarked shape tolerance should meet the requirements of GB1184-80.


(2) The allowable deviation of the unmarked length dimension is ±0.5mm.


(3) The tolerance zone of the casting is symmetrical to the basic size configuration of the rough casting.


2. Requirements for cutting parts


(1) Parts should be inspected and accepted according to the procedure, and can be transferred to the next procedure only after the previous procedure has passed the inspection.


(2) The processed parts are not allowed to have burrs.


(3) The finished parts shall not be placed directly on the ground when placed, and necessary support and protection measures shall be taken. The machined surface is not allowed to have defects such as rust, bumps and scratches that affect performance, life or appearance.


(4) The surface finished by rolling shall not peel off after rolling.


(5) There should be no oxide scale on the surface of the parts after heat treatment in the final process. Finished mating surfaces and tooth surfaces should not be annealed


(6) The surface of the processed thread is not allowed to have defects such as black skin, bumps, random buckles and burrs.
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