In NC lathe machining parts, the process should be divided according to the principle of process concentration, and most or all surface processing should be completed as much as possible under one clamping. According to the different structure and shape of parts, the outer circle, end face or inner hole are usually selected for clamping, and the unity of design basis, process reference and programming origin shall be ensured as far as possible. In batch production, the following two methods are commonly used to divide processes.
(1) According to the machining surface of parts. The surface with high position accuracy is arranged under one clamping to avoid the installation error caused by multiple clamping affecting the position accuracy.
(2) According to rough and finish machining. For parts with large blank allowance and high machining accuracy requirements, rough turning and finishing turning should be separated and divided into two or more processes. The rough turning is arranged on the CNC lathe with lower precision and higher power, and the fine turning is arranged on the CNC lathe with higher precision.
The division of machining process of CNC lathe mainly considers the production program, the structure and technical requirements of the equipment and parts themselves. In mass production, if the efficient machining center with multi axes and multi cutters is used, the production can be organized according to the principle of process centralization; if it is processed on the automatic line composed of modular machine tools, the process is generally divided according to the principle of decentralization
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