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Short cylindrical roller bearing is a kind of high rotation precision, accurate cooperation, mainly bear radial load, mainly used for roller bearing large precision machine tool spindle and the finishing equipment. In recent years, this type of bearing has become the dominant products carvedilol group company oversize bearing division of production and processing, the output value of output accounted for about the cause of the 1/3 or so. But due to the division of the past followed the production process of old and processing methods, resulting in bearing a supporting qualified rate is low (only 60%), resulting in a huge waste of materials and man hour, thus affecting the further improvement of the division of economic benefits.
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Short cylindrical roller bearing, double row into single row, four column and other categories, but careful study of its structural features have many things in common: straight raceway, welding protective device. Thus in the production process problems are extremely similar, so the optimization of technological content will be very similar, so the selection of short cylindrical roller bearing "the greatest annual output 32672" model for the representatives of the optimization of process structure test, and will be extended to other types of bearings experience in machining process, in order to obtain more considerable economic benefits.
Two, the current situation and existing problems of production and processing
"1, 32672" bearing, coat with Gcr15simn steel processing, the larger size series, heat treatment quenching process is difficult to control the amount of shrinkage and distortion degree, often cause quenching after elliptic and dry grinding allowance, resulting in outer raceway size, grinding.
"2, 32672" bearing inner raceway, coat due to quenching elliptic reason, cause allowance is not uniform, so that the processing of residual stress is not uniform, resulting in the ferrule end after grinding raceway size is not stable, it is difficult to control in the process within the prescribed scope.
"3, 32672" bearing inner raceway grinding, coat at the beginning, due to machine tool equipment aging caused by grinding head spindle rotation accuracy is low, the formation of coarse grinding raceway edge plane degree, cause the terminal after grinding raceway size deviation.
4, technical coordination work to keep up. Due to the above causes "32672" raceway grinding, the influence of the complete bearing assembly clearance, resulting in the clearance of substandard, causing rotation center bearing uncertainty, causing the holder center diameter is too large or too small (holder hole center diameter were according to regulations and the uniform size processing), often produce bearing rotation flexibility reduces and clearance uneven phenomenon, which leads to "32672" bearing a complete pass rate was only 60%, also caused the assembly time, processing (drilling, welding) holder of working hours and materials unnecessary waste.