Investigation of spindle-tool assembly dynamics for optical grinding motorized spindles

Abstract Advanced optical systems have brought forward higher requirements for aspheric processing of hard brittle materials, which put forward higher request to the dynamic performances of optical grinding spindles. Due to the integration of the spindle and the tool of optical machine systems, the dynamic behaviors of the spindle system are more complicated than that of other spindles. An integrated model dynamic model of optical grinding motorized spindles which consists of a bearing model, a thermal model and a spindle-tool dynamic model is proposed. The bearing model takes the effect of the thermal displacement into account, and the rotor dynamic model with the effects of the tool and damp is established by the finite element method (FEM). An example calculation on a grinding motorized spindle is preformed and the correlative test is carried out. In the process, the dynamic model is modified by the free excitation test. The mathematical results agree well with the experimental data, which indicates that the proposed model is able to analyse the bearing-spindle-tool assembly dynamics of optical grinding motorized spindles. Meanwhile, the influences of the thermo-mechanical coupled factor (TMCF) and the tool on the dynamic behaviors of the system are obtained. The conclusions are available to the dynamic analysis and design of various high speed and precision spindles.

[1]  Kon Well Wang,et al.  An Integrated Approach Toward the Dynamic Analysis of High-Speed Spindles: Part 2—Dynamics Under Moving End Load , 1993 .

[2]  T. S. Sankar,et al.  Dynamic Analysis and Optimal Selection of Parameters of a Finite Element Modeled Lathe Spindle Under Random Cutting Forces , 1983 .

[3]  Sun-Min Kim,et al.  Prediction of thermo-elastic behavior in a spindle–bearing system considering bearing surroundings , 2001 .

[5]  Liang Zhao,et al.  Thermal error modeling with dirty and small training sample for the motorized spindle of a precision boring machine , 2017 .

[6]  Christian Brecher,et al.  Machine tool spindle units , 2010 .

[7]  B. Guo,et al.  Mechanical truing of V-shape diamond wheels for micro-structured surface grinding , 2015 .

[8]  Yung C. Shin,et al.  Dynamics of Machine Tool Spindle/Bearing Systems Under Thermal Growth , 1996, Dynamic Systems and Control.

[9]  Junfeng Liu,et al.  Thermo-mechanical behavior analysis of motorized spindle based on a coupled model , 2018 .

[10]  Tony L. Schmitz,et al.  Predicting High-Speed Machining Dynamics by Substructure Analysis , 2000 .

[11]  R. Flores-Hernández,et al.  Free upper-disk rotational speed under loose abrasive grinding in conventional machines , 2010 .

[12]  Jenq-Shyong Chen,et al.  Bearing load analysis and control of a motorized high speed spindle , 2005 .

[13]  Hongqi Li,et al.  Analysis of bearing configuration effects on high speed spindles using an integrated dynamic thermo-mechanical spindle model , 2004 .

[14]  Shuyun Jiang,et al.  A modeling approach for analysis and improvement of spindle-drawbar-bearing assembly dynamics , 2010 .

[15]  Peng Zhang,et al.  An integrated model for high-speed motorized spindles – Dynamic behaviors , 2013 .

[16]  R. Flores-Hernández,et al.  Relative velocity and loose abrasive wear in conventional grinding machines , 2009 .

[17]  H. Benaroya,et al.  DYNAMICS OF TRANSVERSELY VIBRATING BEAMS USING FOUR ENGINEERING THEORIES , 1999 .

[18]  K. W. Wang,et al.  Integrated approach toward the dynamic analysis of high-speed spindles: Part I - system model , 1993 .

[19]  Chao Zou,et al.  A new method for field dynamic balancing of rigid motorized spindles based on real-time position data of CNC machine tools , 2019 .

[20]  Wei-Yao Hsu,et al.  Characterizations and models for the thermal growth of a motorized high speed spindle , 2003 .

[21]  K J H Al-Shareef,et al.  On the Quasi-Static Design of Machine Tool Spindles , 1990 .

[22]  J A Brandon,et al.  On the effects of variations in the design parameters on the dynamic performance of machine tool spindle-bearing systems , 1990 .