The concept and technical requirements of machining

Machining refers to the process of changing the shape or performance of a workpiece through a mechanical device. Mechanical processing is divided into cold processing and hot processing according to the temperature state of the workpiece being processed. Generally processing at room temperature, and does not cause chemical or phase changes of the workpiece, it is called cold processing. Generally, processing at higher or lower than normal temperature will cause the chemical or phase change of the workpiece, which is called thermal processing. Cold processing can be divided into cutting processing and pressure processing according to the difference in processing methods. Thermal processing commonly includes heat treatment, forging, casting and welding. In addition, cold heat treatment is often used during assembly. The machinery required for processing includes digital display milling machine, digital display forming grinder, digital display lathe, electric discharge machine, universal grinder, machining center, laser welding, middle wire, fast wire, slow wire, cylindrical grinder, internal grinder, Precision lathes can be used for turning, milling, planing and grinding of precision parts. This type of machinery is good at turning, milling, planing and grinding of precision parts, and can process various irregular-shaped parts with a machining accuracy of up to 2μm. With the rapid development of modern machining and machining technology, many advanced machining technology methods have slowly emerged, such as micro machining technology, rapid prototyping technology, precision ultra-precision machining technology, etc. Technical requirements for machining: 1. Tolerance requirements. In the process of machining, it is necessary to comply with the regulations and requirements for uninjected shape tolerances. The length deviation is 0.5mm up and down, and the basic size configuration of the symmetrical blank casting of the casting tolerance zone must meet the requirements. Relevant requirements will work. 2. Requirements for cutting parts. Parts need to be inspected and accepted according to procedures. However, it should be noted that after the previous process has passed the inspection, it can then be transferred to the next process. The processed parts are not allowed to have burrs, so please pay attention to this point. When placing the finished parts, pay attention to it. It cannot be placed directly on the ground and needs to be supported and protected. There should be no rust on the ground and defects that affect performance and cause bumps and scratches in life or appearance. For the processed surface, it should be noted that there should be no crushing or falling off. After the final process is heat-treated, there should be no oxide scale on the surface, especially the mating surface after finishing. The tooth surface should not be annealed. exist. There should be no black skin, bumps and other defects on the thread surface after machining, this must be paid attention to. For machine production, mechanical processing includes the transportation and storage of raw materials, production preparation, blank manufacturing, parts processing and heat treatment, product assembly, and debugging, painting and packaging. The content of the production process is very extensive. Modern enterprises use the principles and methods of system engineering to organize and guide production, and regard the production process as a production system with inputs and outputs. It can make the management of the enterprise scientific, and make the enterprise more adaptable and competitive. Recommended article: Understand metal cutting processing technology and improve metal cutting processing technology Previous post: Analysis of surface treatment methods and advantages and disadvantages of metal stamping parts