Generally speaking, the process route is the entire processing route that the entire part processing needs to go through from the blank to the finished product, and the development of the process route is an important part of the precision machining process. The main task is to determine the number of processes and process content, select the processing method for each surface of the part, and determine the order of precision parts processing for each surface.
The main difference between CNC machining and ordinary machine tool process route design is that the former is not the entire process from the blank to the finished product, but the specific description of several CNC machining processes. In the CNC precision machining, CNC machining process is generally throughout the whole process of parts processing, so it needs to be well connected with other processing processes, which is what we should pay attention to in the process design.
According to the characteristics of cnc precision parts processing, CNC machining process can be divided according to the following methods.
First, one installation and one processing as one process. The method is applicable to the parts with less processing content, and can reach the state of pending inspection after processing.
Second, the process is divided according to the processing content of the same tool. Although the surface of some precision parts can be completed in the middle of one installation, but considering the program is too long, it will be limited by some memory and continuous working time of the machine tool, for example, if a process can not be completed within one working time and the program is too long, which will increase the difficulty of error and retrieval. Therefore, among the cnc precision parts processing, the prepared process should not be too long, and each process should not have too much content.
Third, according to the processing parts to divide the process; for the workpiece being processed more content, processing parts can be divided into several parts according to their structural characteristics, such as cavities, shapes, surfaces or planes, etc., each part of the processing can be considered a process.
Fourth, divided into roughing and finishing; certain materials precision parts processing process is easy to deformation, so it is necessary to calibrate the deformation that may arise after roughing. Generally speaking, roughing and finishing processes should be separated; sequential arrangement should be considered according to the structure and blank of the part, as well as the need for positioning, mounting and clamping. Sequential arrangement should generally be carried out according to the following principles.
The processing of the upper process should not affect the positioning and clamping of the next process, and should be integrated with ordinary machine tools interspersed with the processing process: 1.
1. first processing the inner cavity, and then processing the shape.
2. preferably under the same positioning, clamping mode or use the same tool continuous processing, in order to reduce the number of tool changes for heavy-duty positioning.
3. At the same time, the principle of precision parts machining order arrangement is: first fine then fine, first main then secondary, first face then hole, benchmark first.