OPTIMIZATION OF THE DESIGN OF THE DEVICE FOR ACHIEVING ACCURACY OF BASEING OF MULTI-STAGE SHAFTS

Abstract

An analysis of the designs of machine tools for installing shafts on rigid support prisms, in universal machine vices, and in assembly and disassembly devices was carried out. It has been established that the time flexibility factor, which is characterized by the time of device readjustment, the size of the starting batch of parts, and the time of processing the part, has the highest indicators of time flexibility for the layout of the assembly and disassembly device. It has been established that it is advisable to use such a device for starting batches of more than 3 pieces, if the main processing time is 1 minute. Analytical studies of the accuracy of positioning of multi-stage shafts in prisms for two variants of support necks were carried out: the base surfaces have the same accuracy quality; the base surfaces have different accuracy qualities. Studies have shown that the value of the error of basing for support necks according to the first option increases with an increase in the diameter of the base surfaces of the workpieces and a decrease in the angle of the prism α. According to the second option, the value of the basing error increases with increasing the accuracy of processing the neck and reducing the value of the prism angle α. The obtained results indicate the feasibility of using the design of the basing prism with an angle α=120⁰ for installing shafts on support necks Ø50...80 mm.