Error Dynamic Testing Technology For Precision Ball Screw Spiral

Precision ball screw unit is the key part of NC machine.and its manufacturing level determines the precision level of NC machine to great extent. It can convert angular displacement to line displacement, and the relationship of them meet a constant. And the above request depend on helicoid accuracy of screw, in which the accuracy of screw thread play a decisive role.Combining with actual projects of Shandong Jining Best Precision Screws Manufacturing CO.,LTD.,the paper developed a "dynamic measuring apparatus for helix line error of precision ball screw", which can fulfil the requests of product quality inspection, control and management in factories.Firstly,I summarized the current measurement of transmission error of machine tool,And present a view of pulse signal computer subdivision counting methods.The analyses focused on the principles and the methods how to realize it, then the paper put a great emphases on analysis for the errors of the method. Based on the theory, we developed dynamic measuring apparatus for helix line error of pricision ballscrew, Measurement systems consists of the superior and inferior systems, the superior and inferior systems communicates By the RS232 interface.so many functions,such as plotting the curve of the measurement result in real-time,calculating, analyzing and saving the measure result,creating and printing the measure report according to some standards and so on can be realized.Then,the paper analyzed and summarized main factors of ballscrew thread measurement accuracy error, a detailed analysis of the various components of the measurement error, and calculate the precision of helix error dynamics gauges,The value of calculation accords with the requirement precision.At last,we make a large amount of analyze on measure results.The error curve was dealt with temperature amendment and filter processing.And, print the measuring report.