The four main elements of precision machining

Precision machining is technically difficult, has many influencing factors, involves a wide range of areas, has a high investment intensity and a strong product personality. Its main elements are the following five aspects.

(1) Machining Mechanisms In addition to the precision of traditional machining methods, non-traditional machining (special machining) methods are developing rapidly. At present, the traditional processing methods mainly include diamond tool precision cutting, disk diamond micron grinding wheel precision grinding, precision high-speed cutting and precision abrasive belt grinding, etc.; non-traditional processing methods mainly include electron beam, ion beam, laser beam and other high-energy beam processing, electric spark, electrochemical processing, photolithography (etching), etc.. And there are compound processing methods such as electrolytic grinding, magnetic grinding, magnetic fluid polishing, ultrasonic honing, etc. with compound processing mechanism. The study of processing mechanism is the theoretical basis of precision and ultra-precision machining and the growth point of new technology.

(2) machined materials Precision machining of machined materials in the chemical composition, physical and mechanical properties, chemical properties, processing performance are strict requirements, should be uniform texture, stable performance, external and internal are no macroscopic and microscopic defects. To meet the performance requirements of the machined material to get the expected effect of precision machining.

(3)Processing equipment and process equipment Precision machining should have high precision, high rigidity, high stability and automation of machine tools, the corresponding diamond tools, cubic boron nitride tools, diamond grinding wheels, and cubic boron nitride grinding wheels. And the corresponding high-precision, high-rigidity fixtures and other process equipment in order to ensure the quality of processing. Precision machining should first consider having the corresponding precision machining machine tools, many precision machining is often from the design and production of ultra-precision machine tools to start. And to configure the required tools. At present, the general series of precision machining machine tools are fewer. The batch size will not be large. Precision machine tool cost is very high, need to special order, if the existing precision machining machine processing still can not meet the requirements. Can be through process measures or error compensation to improve processing accuracy.

(4) Detection Precision machining must have the corresponding detection technology, the formation of processing and testing integration. For precision machining detection there are three ways: offline detection, in-situ detection and online detection. Off-line detection refers to the completion of processing, the workpiece will be sent to the inspection room to test; in situ detection refers to the workpiece is not removed after the completion of the processing on the machine tool, in situ testing, if found to have any problems. To facilitate re-machining; online inspection is in the process of processing to detect, so as to be able to actively control and implement dynamic error Park compensation.