Operation steps and normal temperature state of precision machining, Nanjing Precision Engineering Co., ltd
Precision machining is a process in which the external dimensions or properties of workpieces are changed by processing machinery. According to the temperature state of the workpiece to be processed, it can be divided into cold machining and hot machining when it is in operation.
Generally, it is processed at normal temperature and does not cause chemical or phase changes of workpieces, which is called cold working.
Precision is generally processed above or below normal temperature, which will directly cause chemical or phase changes of workpieces and is called thermal precision machining.
Cold machining can be divided into cutting and pressure machining according to the difference of machining methods.
Thermal Processing commonly includes heat treatment, forging, casting and welding.
The first is the requirement on the hardness of the material. For some occasions, the higher the hardness of the material, the better. It is only limited to the hardness requirement of the processed parts. The processed material cannot be too hard, if it is harder than the parts, it cannot be processed. Operation step 1 of precision precision machining.
Finishing processing: this processing principle is roughly some polishing and polishing processing, which is usually the step after the product is completely completed. 2.
First face and then hole: when carrying out precision mechanical parts, for workpieces such as supports, it requires both plane processing and mechanical hole processing, in order to reduce the precision error of the processed holes, machining the plane first and then machining the hole is beneficial to reduce the error. 3.
Dividing processing stages: when products are used for precision mechanical parts, different degrees of processing shall be carried out according to different product requirements, and the processing degree shall be divided. If the precision requirement is not high, then a simple rough machining stage will be fine.
The schedule requirements of products are becoming more and more strict, and the semi-finishing and finishing stages will be carried out in the future. 4.
Benchmark first: when using mechanical equipment to process products, a datum plane must be determined, so that there can be a positioning reference in subsequent processing. After determining the datum plane, then the datum plane must be processed first.
In precision mechanical parts, many workpieces are not produced at one time, but when the workpieces are produced, they are just a rough model.
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