Abstract: For precision components, the machining is very strict, and the machining process includes feeding and cutting. There are specific requirements for the size, accuracy is also required, such as 1mm positive and negative number of microns, etc., if the size is too much mistakes will become waste, this time is equivalent to...
For precision parts, the machining is very strict, and the machining process includes feeding and cutting. There are specific requirements on the size, accuracy is also required, such as 1mm positive and negative number of microns, etc., if the size is too many mistakes will become waste, this time is equivalent to reprocessing, time-consuming and laborious, and sometimes even make the entire processing material scrapped, This leads to an increase in cost, and at the same time, the parts must not be used.
(1) The most important issue is the size problem. It must be strictly processed in accordance with additional drawings. The actual dimensions processed will certainly not be the same as the theoretical dimensions of drawings. However, as long as the machining size is within the allowable range of error, all Qualified parts, therefore, the requirements for precision parts processing are strictly in accordance with the theoretical dimensions of processing.
For example, what is the diameter of the cylinder, there are strict requirements, positive and negative errors are qualified parts within the scope of the required requirements, otherwise they are all unqualified parts; length and width also have specific strict requirements, positive and negative errors are also stipulated, such as an inline Cylinders (take the simplest basic parts as an example), if the diameter is too large and exceeds the allowable range of error, it will result in the situation where the insertion is not possible. If the actual diameter is too small, the error allows the lower limit of negative value. It will cause too loose and insecure problems. These are unqualified products, or the cylinder length is too long or too short, beyond the tolerance range, are all unqualified products, must be invalidated, or re-processed, this will inevitably lead to increased costs.
In order to ensure precision machining of precision parts, rough and fine mechanical parts are best processed separately. Because the rough mechanical parts are processed with large amount of cutting, the cutting force and clamping force of the workpiece are large, the amount of heat generation is large, and the machining surface of the mechanical parts has more remarkable work hardening phenomenon. There is a large internal stress inside the workpiece. Coarse and coarse mechanical parts are processed continuously, and the accuracy of the parts after finishing will be quickly lost due to the redistribution of stress.
Through the error homogenization method to improve its quality, it can make those local larger errors affect the entire machining surface more evenly, so that the machining error transmitted to the workpiece surface is more uniform, so the processing accuracy of the workpiece is correspondingly greatly improved.
(2) Reasonable equipment selection. Use rigid, high-precision machine tools to get good results. Advanced precision parts processing equipment and testing equipment, advanced processing equipment make the processing of precision parts more simple, more accurate and better. The testing equipment can detect parts that do not meet the requirements and allow all products delivered to customers to truly meet the requirements.
The coarse mechanical parts processing is mainly to cut off most of the machining allowances, and does not require high machining accuracy of the mechanical parts, so the rough machining should be performed on the machine tools with high power and precision, and the high-precision machining processes require higher requirements. Precision machining.
(3) Heat treatment processes are often arranged in the processing route of precision parts. The location of the heat treatment process is arranged as follows: In order to improve the metal cutting performance, such as annealing, normalizing, tempering, etc., are generally arranged before the processing of mechanical parts.
Planning and production of skills planning and special skill equipment, preparation of production plans, preparation of production information, etc. Followed by the production of rough, through the casting, stamping and other processes to complete; followed by the processing of parts, including cutting, heat treatment, appearance and other disposal.
(4) There are still some requirements for the material processing of precision mechanical parts. Not all materials are suitable for processing. For example, the material is too soft or too hard. The former is not necessary for processing, while the latter cannot be processed. Exceeding the hardness of machined parts, it is possible to collapse the parts. Before processing, be sure to pay attention to the density of the material. If the density is too high, the hardness is also large, and if the hardness exceeds the machine (lathe turning tool) Hardness, which cannot be processed, will not only damage the parts, but also cause dangers, such as turning the tool and hurting people. Therefore, in general, for machine processing, the material material is lower than the hardness of the machine knife so that it can be processed.