Mechanical processing process

Machinery processing manufacturers take you to understand the process flow of mechanical processing

CNC machining is a process that uses processing machinery to change the external dimensions or performance of the workpiece. It is also a non-standard machining process. According to the temperature state of the workpiece being processed, it is divided into cold working and hot working. It is generally processed at room temperature and does not cause chemical or physical phase changes in the workpiece, which is called cold processing. Generally, processing at temperatures above or below normal temperatures will cause chemical or physical phase changes in the workpiece, which is called thermal processing. Cold working can be divided into cutting processing and pressure processing according to the difference in processing methods.

1. Design steps and requirements: ⑴ Produce a large number of types; ⑵ Conduct process analysis on parts (adopting new national standards); ⑶ Determine the type, shape, size and accuracy of the blank; ⑷ Develop a process route. This is a key step in formulating process procedures. Its main tasks are: selecting positioning benchmarks, determining the processing methods of each surface, arranging the processing sequence, determining the degree of concentration and dispersion of processes, and arranging heat treatment, inspection and other auxiliary processes. When formulating a process route, several possible solutions are generally proposed, analyzed and compared, and finally the best solution is determined; (5) Determine the equipment used in the process.

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2. When selecting a machine tool, you should pay attention to the following basic principles: The processing size range of the machine tool should be compatible with the external dimensions of the workpiece. The accuracy of the second machine tool should be compatible with the accuracy required by the process. ③The productivity of machine tools should be adapted to the production type of workpieces. If the size of the workpiece is too large, the accuracy requirements are too high, and there is no appropriate equipment to choose from, machine tool modification or the design of a special machine tool should be considered. At this time, a machine tool modification (or design) task book needs to be proposed based on the specific process. The task letter should provide the necessary data and information related to the process processing. For example: process dimensions, process tolerances and technical requirements, workpiece positioning, clamping methods, as well as the overall layout of the machine tool, the productivity of the machine tool, etc.; ⑹ Determine the process equipment used in each process.

3. When selecting process equipment, you should pay attention to the following principles: Selection of a pair of fixtures. Selection of two pairs of cutting tools: Under normal circumstances, standard cutting tools should be used as much as possible. When processing on combined machine tools, production is organized according to the principle of process concentration, and special composite tools can be used. ③Selection of measuring tools: Measuring tools are mainly selected based on the type of production and the accuracy of the required inspection. Universal fixtures should be used in single-piece small-batch production, and limit gauges, high-productivity inspection fixtures and inspection instruments should be used in mass production; ⑺ Determine the machining surplus of each process, and calculate the process dimensions and tolerances; ⑻ Determine each process cutting amount. However, for large-volume assembly line production, especially automatic line production, the cutting amount needs to be specified for each process and step in order to calculate the production cycle of each process. ⑼ Determine the time quota; ⑽ Fill in the process documents.