Process analysis is the preliminary process preparation work for hardware CNC turning processing. Whether the process is reasonable or not has an important influence on the later programming, the processing power of the machine tool and the processing accuracy of the parts. In order to compile a reasonable and useful processing program, the programmer is required not only to understand the operating principle, functional characteristics and structure of the CNC lathe. To grasp the programming language and programming format, you should also be proficient in the processing technology of the workpiece, determine the reasonable cutting amount, and correctly select the tool and the workpiece clamping method. Therefore, it is necessary to follow the general process guidelines and combine the characteristics of CNC lathes to analyze the CNC turning process of hardware accessories in detail. The main content of the analysis is: analyzing the processing requirements and rationality of the parts according to the processing drawings; inferring the clamping method of the processed parts on the CNC lathe; the processing order of the appearance of each processed part, the feed route of the tool, and a series of supplies Preparations such as: selection of tools, fixtures and cutting parameters.
Parts drawing analysis is the primary task of drawing up the CNC turning process. Mainly carry out the analysis of the scale labeling method, the analysis of the summary elements and the analysis of the accuracy and skill requirements. In addition, it is necessary to analyze the rationality of part structure and processing requirements, and select process benchmarks.
The CNC turning process is divided into the following steps
1. An analysis of the scale marking method
The scale marking method on the part drawing should be used to the processing characteristics of the CNC lathe, and the scale shall be marked with the same datum or the coordinate scale shall be given directly. This marking method is not only convenient for programming, but also conducive to the consistency of design benchmarks, process benchmarks, measurement benchmarks and programming origin. If there is no consistent design basis for the dimensions of each direction on the part drawing, you can consider choosing a consistent process reference without affecting the accuracy of the part. Calculate and transform various scales to simplify programming calculations.
2. Summary and analysis of the elements
In manual programming, the coordinates of each node must be calculated. In the automatic programming, all the geometric elements summarized by the part should be defined. Therefore, when analyzing the parts drawing, it is necessary to analyze whether the given conditions of the few elements are sufficient.
3. Analysis of accuracy and skill requirements
Analyzing the precision and skills of the processed parts is an important part of the analysis of the processability of the parts. Only on the basis of analyzing the dimensional accuracy and surface roughness of the parts, can the processing method, clamping method, tool and cutting amount be selected correctly and reasonably Wait. The main content includes: analysis accuracy and whether the hard index skills requirements are complete and reasonable; analysis whether the CNC turning machining accuracy tolerance of the process meets the drawing requirements, if not, other processing methods should be adopted to make up. At the same time, there is a margin for the follow-up process; for the appearance with position accuracy requirements on the drawing, it should be ensured that it is completed in one clamping; for the appearance with higher surface roughness, constant linear speed cutting should be used (note: in the turning end face When, the maximum speed of the spindle should be limited).