Precision machining operation steps and normal temperature condition

by:NJPE     2020-06-28
Precision precision machining is a kind of processing machinery to change the shape of workpiece size or performance process, according to be the workpieces in the temperature of the state, in use can be divided into cold and hot working. General processing at room temperature, and not artifacts caused by chemical or physical change, says cold working. Precision machining generally in a state of above or below normal temperature processing, it will directly cause artifacts chemical or phase change, known as the hot working. Cold working according to the difference of processing methods can be divided into cutting machining and pressure. Hot working common heat treatment, forging, casting and welding. First is on the material hardness requirements, for some occasion, material hardness is higher, the better, is only limited to machining parts hardness requirements, processing of materials can't be too hard, if than parts force will not be able to process. Precision machining operation step 1. Finishing processing: the processing principle is roughly some fine polishing processing, it is usually carried out in the product after complete architecture of steps. 2. Hole: after face first in precision machinery spare parts, for support such artifacts, it must carry on the plane machining and mechanical machining, in order to come out of the hole of precision machining precision error is smaller, the first plane after machining hole is helpful to reduce the error. 3. Divide the processing stages: product at the time of precision machinery parts, according to the requirements of the different products to different degree of processing, processing degree, if the accuracy is not high, so a simple rough machining stage. Product schedule is more and more strict, the follow-up for semi-finishing and finish precision machining stage. 4. Benchmark: first in the use of machinery and equipment for processing, product must determine a datum plane, so that in the subsequent processing time can have a location reference, determine the datum, then datum processing out first. In precision machinery parts, there will be a lot of workpiece is not produced by a one-off, but when the workpiece is produced, it is just a rough model.
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