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Content of precision machining

Precision machining is difficult in technology, has many influencing factors, involves a wide range of investment intensity, strong product personality

(1) Materials to be processed: the processed materials of precision machining have strict requirements on chemical composition, physical and mechanical properties, chemical properties and processing properties. They should be uniform in texture, stable in performance, and free from macro and micro defects inside and outside. Only when the processed materials meet the performance requirements can the expected effect of precision machining be obtained.

(2) Processing equipment and process equipment: precision machining should have high precision, high rigidity, high stability and automation machine tools, corresponding diamond cutting tools, cubic nitriding jump cutting tools, diamond grinding wheels, cubic nitriding jumping grinding wheels, and corresponding high-precision, high stiffness fixtures and other technological equipment to ensure the processing quality. Precision machining should first consider the precision machine tools with corresponding precision. Many precision machining often start from the design and manufacture of ultra precision machine tools. And to configure the required tool. At present, the general series of precision machining machine tools are less, and the batch is not large. The cost of national precision machinery machine tool is very high, so it needs special order. If the machine can't meet the requirements when it is processed on the existing precision machining machine tool. The machining accuracy can be improved by technological measures or error compensation.

(3) Detection: precision machining must have corresponding detection technology to form the integration of processing and testing. There are three kinds of detection methods for precision machining: off-line detection, in-situ detection and online detection. The off-line inspection refers to sending the workpiece to the inspection room after the processing is completed; the on-site detection refers to the on-site detection without unloading the workpiece after processing on the machine tool, and if there is any problem, it is convenient for further processing; on-line detection is to carry out the inspection in the process of processing, so as to actively control and implement dynamic error compensation. Error compensation is an important measure to improve the machining accuracy, which is based on the machine tool manufacturing accuracy has reached a certain level. The influence error is separated and the error value is compensated by the error compensation device. The static error compensation is based on the error value in advance, which is compensated by hardware or software during processing. For example, the pitch error of the machine tool transmission wire can be compensated by the correction ruler; the dynamic error compensation is real-time compensated in the processing based on the on-line detection. The online detection and compensation technology of precision machining is the key technology to realize the quality assurance of precision machining. The detection technology is integrated into the content of precision machining, and the on-line measurement method can make the operator find the problems of the workpiece in time, and feed back to the CNC system.