The standards of the precision parts processing industry are very strict, and there are different processes such as cutting in and cutting out during the processing. The size will also have different specific requirements according to the product, and the processing accuracy requirements will also vary. Generally speaking, the precision requirements for precision machining are very high, and sometimes it can even be accurate to a micron difference below 1mm. If there is a large difference in size, the product becomes scrap and needs to be reworked to meet the requirements, which is a time-consuming and labor-intensive process. Sometimes all raw materials will be scrapped, resulting in an increase in cost, and at the same time the parts will inevitably be unusable, so there are many requirements for precision parts processing.
So what are the requirements for precision parts processing?
(1) Usually, due to the cutting amount, heat generation and cutting force of the parts are different from the roughness and precision of the parts, in order to ensure the machining accuracy of the parts, it is necessary to process rough parts and precision mechanical parts separately. If rough machining and precision machining are carried out continuously, the accuracy of precision machined parts will be lost due to the difference in stress.
(2) Rationality of equipment selection. The machining of rough parts does not require high machining accuracy, but the main purpose is to reduce the machining allowance, so precision machining requires very high-precision machine tools. In the processing route of precision parts, heat treatment process is often arranged. The location of the heat treatment process is arranged as follows: In order to improve the cutting performance of metals, such as annealing, normalizing, quenching and tempering, etc., it is generally arranged before the processing of mechanical parts.
(3) Generally speaking, almost all precision parts are processed with heat treatment process, which can improve the cutting performance of metal. The processing and manufacturing of precision parts not only require the accuracy and stability of the machine tool and the accuracy of the tool and fixture to ensure, but also require precise measuring instruments for calibration and measurement. Some are in the process of processing, some are after the inspection.
A large number of hot forging forming and warm forging finishing processes of one fire and two forging parts are the process of directly changing the appearance of raw materials into semi-specific products or different products. The process flow of precision parts is more complicated, and the processing technology standards of precision parts can be divided into casting, forging, stamping, welding, heat treatment, processing, assembly and other categories according to different processes. The processing process of precision parts often refers to the general term of the entire part CNC machining and machine assembly process, while other processes such as cleaning, inspection, equipment maintenance, oil seal, etc., the turning method changes the surface properties of raw materials or semi-finished products. This process is called numerical control. Machining, the corresponding tool middle trajectory has different switching forms, and the precision parts system has linear and circular interpolation functions.
