Will help ensure the quality of machining. Work piece in the rough, due to larger machining allowance, the cutting force, clamping force is also larger, will cause greater deformation and internal stress redistribution. If not divided into coarse, fine stage of machining, the deformation too late to resume, will affect the machining accuracy. Divided into machining stage, the gradual recovery and correction of deformation, improve machining quality.
Facilitate the rational use of equipment. Roughing requires the use of rigid, high efficiency and low precision machine tools, precision machining requires high precision machine tools. After the division of machining stage, can avoid lean and rough, give full play to the performance of machine tools, to extend the service life of machine tools.
Easy to arrange heat treatment processes and inspection processes. Such as roughing stage, the general arrangements for the stress of heat treatment to eliminate stress. Some parts before finishing quenching and other final heat treatment arrangements, the deformation can be eliminated by finishing.
Facilitate the timely detection of defects and to avoid damage to the processed surface. After the rough roughing stage, the defect that has been exposed, you can promptly find and deal with. At the same time, the finishing process is at the end of the process to prevent the finished surface from being damaged in handling and clamping.
In the preparation of parts of the process route, generally should follow the principle of division of machining stage, but the specific application to be flexible. For example, for some refined rough, lower machining accuracy and rigidity and good parts, you do not have to divide the machining stage. In another example, some of the more rigid parts, due to lifting more difficult, often do not divide the machining phase and finish the rough finishing after a folder.
The process of dividing the machining stage is for the entire part of the process, cannot be processed from a certain surface or the nature of a process to judge. For example, some of the positioning of the base surface, in the semi-finishing or even roughing stage to complete and cannot be placed on the finishing stage.