(1) Geometric modeling of parts
For NC programming of complex shape parts based on drawings and measurement data of feature points, the first step is to establish the geometric model of the parts to be processed.
(2) Reasonable selection of processing scheme and processing parameters
The efficiency and quality of NC machining depend on the reasonable selection of processing scheme and parameters. The optimal selection of tool, cutter axis control mode, tool path and feed speed is the premise to meet the processing requirements, normal operation of machine tool and tool life.
(3) Tool path generation
Tool path generation is the most important content in NC machining of complex shape parts. The possibility, quality and efficiency of machining are directly determined by the generation of effective tool path. The primary goal of tool path generation is to make the generated tool path meet the requirements of no interference, no collision, smooth path, smooth cutting load and high code quality. At the same time, the tool path generation should also meet the conditions of good universality, good stability, high programming efficiency and small code amount.
(4) NC machining simulation
Due to the complexity of the shape of the parts and the complexity of the machining environment, it is very difficult to ensure that the generated processing program does not have any problems, among which the most important are the over cutting and undercutting in the machining process, the interference and collision between various parts of the machine tool, etc. For high speed machining, these problems are often fatal. Therefore, it is necessary to take some measures to check and correct the processing program before actual processing. Numerical control machining simulation tests and optimizes the processing program by simulating the processing environment, tool path and material removal process by software. It has the characteristics of good flexibility, low cost, high efficiency and safety and reliability, and is an important measure to improve the efficiency and quality of programming.
(5) Post processing
Post processing is an important part of NC machining programming technology. It transforms the tool position data generated by general pre-processing into NC machining program suitable for specific machine tool data. Its technical contents include kinematic modeling and solution of machine tool, compensation of machine tool structure error, check and correction of non-linear error of machine tool motion, stability check and correction of machine tool motion, feed rate check and code conversion, etc. Therefore, post-processing plays an important role in ensuring the machining quality, efficiency and reliable operation of the machine tool.
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