Mechanical model development of rolling bearing-rotor systems: A review

Recent developments in grinding machines

For the past several decades, significant efforts have been devoted to modeling and analysis of rolling-element bearings to aid in their design and application. This paper reviewed the modeling and analysis of rolling-element bearings with emphasis on single-row ball and roller bearings. The application of bearing models was reviewed as well along with illustrative results.

Rolling-element bearing modeling: A review

Machine tools are vital to modern industries. The performance of a machine tool is assessed according to the dimensional accuracy and surface finish of the machined work-pieces, which are closely related to the dynamic characteristics of the spindle-bearing system. The main purpose of this study is to review relevant studies on dynamic models and the design of spindle-bearing systems of machine tools. These studies related to dynamic models are categorized into two types according to the physical components: spindle shafts and bearings. The dynamic models in each category are comprehensively discussed and coordinated. Guidelines condensed from the sampled papers are provided, followed by an exploration of design-related papers. Finally, a conclusion on the analyzed works is drawn and future lines of research are identified.

Dynamic models and design of spindle-bearing systems of machine tools: A review

With increasing popularity in high-speed machining for its high efficiency, motorized spindles have been widely utilized in modern production facilities. Due to the combination of tools and built-in motors, the dynamic characteristics of motorized spindles are more complex compared with conventional spindles, and it is becoming necessary for engineers to thoroughly realize the influences of the system parameters to the system dynamics with considering the multi-physics coupling property. This paper presents an integrated model to study the electro-thermo-mechanical dynamic behaviors of motorized spindles. The integrated model consists of four coupled submodels as follows: bearing, built-in motor, thermal, and shaft model. Based on the proposed model, a design flow chart is developed and six design parameters are identified. The integrated model is validated experimentally and a design sensitivity analysis of the six parameters is then conducted based on a 170MD15Y20 type spindle. The results show that the integrated model is capable of accurately predicting the dynamic characteristics of motorized spindles, and the sensitivities of the six design parameters to the nature frequencies of the spindle system are obtained with and without the influence of the multi-physics coupling property. The coupling relationship among the electrical, thermal, and mechanical behaviors of the spindle system becomes clear from the results.

Dynamic design for motorized spindles based on an integrated model

This technical brief presents a dynamic model based on the traditional transfer matrix method (TMM) and Jones-Harris nonlinear rolling bearing model to study the effects of the extended structure parameters on the vibration behavior of a high-speed motorized spindle-bearing system. The first critical speed and the dynamic stiffness of the high-speed motorized spindle-bearing system are systematically studied. A design sensitivity analysis of the structure parameters is then conducted to identify the main factor to affect the first critical speed of the spindle-bearing system. The results show that the processing condition, the shaft shoulder, the dimension of motor, and the bearing arrangement are sensitive to the spindle dynamic behavior. The TMM model of the spindle-bearing system is verified by measuring the high-speed motorized spindle overall dynamic stiffness.

Shuyun Jiang

Papers

Dynamic Design of a High-Speed Motorized Spindle-Bearing System