Research On Design And Reliability Of Direct-drive Digital Turntable

At present,the cost-effectiveness advantage of China's CNC machine tools is constantly being lost.The essential reason is not that the machining accuracy of machine tools is much different from that of foreign machine tools,but foreign machine tools have very obvious advantages in terms of reliability.Therefore,enhancing the reliability of CNC machine tools in China is particularly important for improving the competitiveness of CNC machine tools in China.Therefore,it is necessary to design the reliability of the direct-drive CNC rotary table.The main research contents of this article include:1?A direct-drive CNC turntable was designed based on the direct drive technology.The key components were selected,calculated and checked,and the brakes for their core functional components were designed,calculated and checked.The characteristics analyze were completed based on their principal axes and verified used ansys Workbench software.The design of the direct drive CNC rotary table meets the requirements for the use of CNC machine tools in terms of drive torque,speed,and accuracy.2?By collecting reliability data for prototype testing,in-field testing,and user using to get 50 sets of effective reliability data,we calculate common indicators of reliability and build a reliability data model based on Weibull distribution,confirm the reliability of the designed direct drive CNC rotary table,among them the average time between failures is MTBF = 436.24h and improve the direct drive CNC rotary table to further improve its reliability.3?The function analysis of the direct-drive digital turntable is carried out,and the reliability block diagram and reliability mathematical model of the direct-drive digital turntable system are established,which provides the basis for the reliability research of the direct-drive digital turntable.4?Based on the reliability model of the direct-drive CNC turntable and summarized fault information established by the previous article,it analyzes the reliability distribution,prediction and failure modes,and the impact of the hazards.Final by determined of the reliability index of the functional components of the direct-drive CNC turntable and the Failure Mode and Harmfulness of Direct-drive CNC Turntable and Found the Weakness of Direct Drive CNC Turntables to improves the reliability of direct drive CNC rotary tables and specify the direction of direct-drive CNC rotary table design,including brake,sealing system,water cooling system,spindle of turntable.