Shanghai machinery processing factory to take you to understand the process of mechanical processing
Numerical control machining is a process of changing the shape size or performance of the workpiece with machining machinery. According to the temperature state of the workpiece being processed, it is divided into cold processing and hot processing. Generally at room temperature processing, and does not cause the workpiece chemical or phase changes called cold processing. Generally higher or lower than normal temperature processing, will cause the workpiece chemical or phase changes, called hot processing. Cold machining can be divided into cutting machining and pressure machining according to the difference of processing methods.
1. Design steps and requirements: 1. Large number of production types; (2) Process analysis of the parts (using the new national standard); (3) Determine the type, shape, size and accuracy of the blank; (4) To formulate the technological route. This is a key step in the development of process procedures. Its main work is to select the positioning datum, determine the machining method of each surface, arrange the machining sequence, determine the degree of process concentration and dispersion, and arrange heat treatment, inspection and other auxiliary procedures. In the formulation of the process route, it is generally put forward several possible schemes, analysis and comparison, Z to determine a Z best scheme; ⑸ Determine the equipment used in the process.
2. When choosing the machine tool, we should pay attention to the following basic principles: The processing size range of the machine tool should be adapted to the outline size of the workpiece. 2. The precision of the machine tool shall be adapted to the precision required by the working procedure. ③ The productivity of machine tools should be commensurate with the production type of the workpiece. If the workpiece size is too large, the accuracy requirement is too high, there is no appropriate equipment to choose from, should consider the machine modification or design of special machine tools. At this time, it is necessary to put forward the machine tool modification (or design) task book according to the specific process, and the task book should put forward the necessary data and information related to the process processing. For example: process size, process tolerance and technical requirements, workpiece positioning, clamping mode, as well as the overall layout of the machine tool, machine productivity, etc.; Determine the process equipment used in each process.
3. The following principles should be paid attention to when selecting process equipment: the selection of a pair of fixtures. Two pairs of tool selection: under normal circumstances should try to choose the standard tool. In the composite machine tool processing, according to the principle of process concentration organization production, can use special composite tool. ③ The choice of measuring tools: measuring tools are mainly selected according to the type of production and the accuracy of the required test. Single piece of small batch production should use general fixture, mass production, should use limit gauge, high productivity inspection fixture and inspection instrument; To determine the processing balance of each operation and calculate the size and tolerance of the operation; ⑻ Determine the cutting amount of each process. But for mass assembly line production, especially automatic line production, each process, work step need to stipulate the cutting amount, in order to calculate the production beat of each process. (9) the length of time; (10) Fill the process file.
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