Sequential grinding tool, machining mechanism and grinding method for planetary lead screw nut

Abstract

The invention provides a sequential grinding tool, a machining mechanism and a grinding method for a planetary lead screw nut. The machining mechanism comprises a workpiece headstock, a spindle transmission and a grinding wheel headstock and further comprises a first-stage guide rail and a second-stage guide rail. The second-stage guide rail is driven by a trapezoid lead screw or a ball lead screw and used for coarse grinding. The first-stage guide rail is a linear guide rail or is driven by a precision ball lead screw and used for accurate grinding. The second-stage guide rail is installed on a mounting base of the whole machining mechanism, and the second-stage guide rail can be fixedly connected with or separated from the mounting base through a second-stage clamping mechanism. The first-stage guide rail is installed on the second-stage guide rail. The first-stage guide rail can be fixedly connected with or separated from the second-stage guide rail through a first clamping mechanism. The spindle transmission is fixedly installed on the first-stage guide rail. An output shaft of the spindle transmission is connected with the workpiece headstock. The workpiece headstock and the grinding wheel headstock which is located on the same axis as the workpiece headstock are used for clamping a workpiece to be ground and a grinding wheel correspondingly.

Description

technical field [0001] The invention relates to a sequential grinding tool for planetary screw nuts, a processing mechanism and a grinding method, belonging to the category of mechanical manufacturing. Background technique [0002] The planetary screw nut is one of the most important and difficult to process parts in the planetary screw. The important feature of the nut - the processing of the thread determines the precision and production efficiency of the planetary screw. At this stage, the main nut thread processing methods include turning, milling and grinding, among which turning and milling have high efficiency and low precision, and are not suitable for the final machining of planetary screw nuts with high precision requirements; although grinding has high precision, it cannot The processing efficiency is low, and the processing allowance of the final sequence directly determines the processing time of high-precision thread grinding. At the same time, due to the high...

AI Technical Summary

Problems solved by technology

At this stage, the main nut thread processing methods include turning, milling and grinding, among which turning and milling have high efficiency and low precision, and are not suitable for the final machining of planetary screw nuts with high precision requirements; although grinding has high precision, it cannot The processing efficiency is low, and the processing allowance of the final sequence directly determines the processing time of high-precision thread grinding

At the same time, due to the high requirements for the indexing accuracy and pitch accuracy of the multi-head nut of the planetary screw, it is difficult to realize the sequential machining processes such as turning-grinding and milling-grinding. The method of multi-step grinding in one clamping is especially difficult to achieve high-efficiency machining of high-precision nuts with a pitch of about 1mm. It often faces phenomena such as large amount of removal and repeated dressing of the grinding wheel. It is necessary to repeatedly adjust the processing parameters based on the experience of the operator. Often There is a problem of low consistency of nut thread accuracy

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