Development To High Speed Electric Spindle Torque Load Test Bench

High speed CNC machine tools is one of the developing direction and technologyfoundation of equipment manufacturing industry, and it is also a strategy industry forequipment manufacturing industry. The reliability of the key functional parts on CNCmachine tools effects on the reliability of the whole machine. As an important keyfunctional part, electric spindle’s reliability research has significant meaning forincreasing MTBF level for the whole CNC machine tools.Key functional parts are CNC machine tools important sources of failure.Because its volume is little than a whole machine’s, and expense is less than a wholemachine, we can test it in a laboratory environment. We simulate real machiningworking conditions, induce or increase promoting component failure in laboratory,and measure its performance, identify the factors of failure, make statistics of failuredata, establish failure model, thereby the reliability of key functional parts has beenimproved. We achieved the way to improve the reliability of the CNC machine toolsthrough the development and study the reliability of the key functional parts.High-speed electric spindle test and its test-bed are used to test axial runout,radial runout and spindle temperature rise of the electric spindles for CNC machinetools and machining centers and other factors impact on the reliability of electricspindle machining, and evaluate the electric spindle stability, reliability and accuracyto maintain before and after the machine tools working. According to the applyingsubject content and the main objective, we need to develop the comprehensiveperformance test system for general electric spindles, comprehensive test and evaluateon the stability and reliability of high-speed electric spindle combining with thetheoretical calculation.The high-speed electric spindle’s reliability test-bed of electric dynamometerloading system described in this paper, is able to complete electric spindle reliabilitytest above18000r/min, greatly improve the speed than the ordinary electric spindleperformance test-bed. And it is able to achieve high-speed electric spindleperformance test absolutely, such as temperature rise control of the electric spindle,spindle radial runout and axial movement and other tests. It simulates spindle forcestatus (including radial force, axial force and torque) using electric dynamometerloading system and piezoelectric ceramic loading system to achieve electric spindledynamic loading experiments and tests. It is able to detect a variety of failure duringthe test, records information during the tests, and the data can be recorded and query,it collects parameter data for reliability analysis through configuration softwaretogether with boards and industrial computer control system, in order to provide aquantitative numerical evaluation platform to improve the reliability of the electricspindle.After the test-bed debugging and a period of test and detection, the test results show that the high-speed electric spindle’s functions meet the standards, and it worksstable, it perform good in torque loading experiments. We got some test data, and alsofound some failures in the electric spindle. We recorded and analyzed the failures.The deep study on high-speed electric spindle reliability test-bed for the keyfunctional parts reliability of CNC machine tools has great significance.