22 years of industry experience in mechanical parts manufacturing

Six kinds of methods to improve the quality of precision machining

by:HENRY PARTS     2020-10-22
In order to improve the quality of precision machining, and find out the main factors of machining error ( The original error) Is the key, however, how to take the corresponding technology measures to control or reduce the impact of these factors? Below small make up together and you know something about how to effectively improve the quality of precision machining of six kinds of methods: a grouping method this method, error reporting bad MAO or process on the machining dimensions measured error size divided into n groups, each the size of the set of a range of error is reduced to the original indeed/n; Then according to the error of each range respectively, adjust the position of the tool relative to the workpiece center of scatter of the size of the set of a range of basic consistent. In order to make the whole batch of workpiece size scattered greatly narrowed down. This approach often snow economic and feasible than alert hair bad precision. As in the finish machining tooth form, in order to ensure the processing after the ring gear and gear inner hole alignment, should be to reduce the gear inside also with fitting clearance of spindle. In production according to the size of the gear is often grouped, and cooperate with the corresponding packet spindle, it's a way to divide the original error due to clearance, alert the location precision of the gear ring. Second, the error compensation method, this method is artificially created a new kind of original error, the offset in the original process system of original error, so as to reduce machining error, the purpose of the machining accuracy. Three, the error transfer method, this method is essentially the process system of geometric error, mechanical deformation and thermal deformation transfer to does not affect the direction of the machining accuracy. For example, or with a transposition of multistep processes or the transfer tool post processing process, the degree, error transfer entrepreneurs will directly affect the parts on the surface machining accuracy. Four, error homogenization method using this method have a close contact between the surface of each other, each other, or be processed using each other. It can make the local greater error is processing affect the entire surface evenly, make to the workpiece surface machining error is relatively uniform, thus the workpiece machining accuracy is greatly improved. Five, on-site processing method in processing and equipment timing relationship between involves some precision parts, is quite complicated. If blindly raise the accuracy of the parts themselves sometimes difficult or even impossible, not only with local processing can solve this problem. Main points of the on-site processing hair: make sure what kind of position relations between parts, in this kind of position on the use of a part loaded on cutting tool for processing a part. For example, in the manufacture of turret lathe, turret on six big hole axis installation tool rest must ensure that the machine tool and the line of spindle, each big hole in the face and must be perpendicular to the line of spindle. Six, directly reduce the error of this method is widely used in the production process of a kind of basic method. The law is on to find out the main original error factors affecting the machining accuracy, try to directly to eliminate or reduce. Of slender shaft turning, for example, because of the influence of the force and heat, make the work produces bending deformation. We use the 'reverse' big straight knife cutting method, basically eliminate the bending caused by cutting force. Supplemented by spring top again, to further eliminate the dangers of thermal elongation.
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