Development Of Motorized Spindle Reliability Test Bench Based On Mutual Dragging System

CNC machine tool is the essential part of the whole manufacturing industry, which directly determines the reliability level of manufacturing industry and the whole industry system. As a complex manufacturing tool which involves electrical, hydraulic and mechanical system, so it is difficult to make direct research on the CNC’s reliability. Electro-spindle of CNC machine tool is the core component and it has direct impact on the overall reliability level of CNC machine tool. Because of this, the study of spindle reliability will improve the overall level of domestic CNC machine tool industry, which is of great significance. It should be noted that the research on the reliability requires data support. However, on-site data collection is time-consuming and laborious, so we need functional components test bench in the laboratory to simulate the real conditions. What most early research institutions have done is to study the spindle under static force in test bench, but it is not enough for a practical spindle which is under dynamic force other than static force. This paper aims to develop a new reliability test bench which can simulate two electric spindles loaded with torque and force at the same time.This paper aims on research of motorized spindle. In this paper, we first propose the whole plan of the reliability test bench based on the electric spindle mutual dragging system. It is the first time we can do the reliability test for two spindles at one time. The traditional way to load the torque is to add a dynamometer and we spare this facility. Then we give a detailed plan involves mechanical design, electrical design and control design, according to which we develop this test bench.Firstly, we analyze the motorized spindle to study the structure and working status. Secondly, we put on a simulation due to the energy feedback theory to verify the feasibility of the plan. After that, this paper presents the detailed plan of the mechanical structure and validates this idea, also to ensure the axiality by using a new processing method and subsequent adjustments. Finally, this paper gives a complete set of software. The program is transmitted by the serial bus and can be flexibly controlled, in which way we can easily change the working conditions.After continuous improvements, finally, the experimental results show that this test rig is stable and could be used for long time reliability test in good condition, and also it can response quickly and precisely to fast changing load. The piezoelectric ceramics loading system is used for cooperative joint loading. This test bench can achieve real-time monitoring while recording operating conditions and the fault data. So this paper is of huge significance to the reliability studies for motorized spindle of CNC machine.