Grinding Rounding Law and Roundness Limit Prediction of Fully Hydrostatic Supported Grinding System

doi:10.3901/JME.2023.21.085

Abstract

Abstract: The roundness of the spindle journals directly affects the rotary accuracy of the hydrostatic spindle system, and in order to manufacture a nano-level rotary accuracy of the hydrostatic spindle system, the roundness of the spindle journals must be continuously improved. At present, the highest accuracy of journal grinding roundness achievable by high-precision grinding machines ranges from 0.2-0.5 μm. To further improve the journal grinding roundness, the above grinding solutions can hardly meet the needs. Based on this, the grinding circularity law of the full hydrostatic support system with liquid hydrostatic support for the headstock spindle, tailstock spindle and grinding wheel spindle is systematically investigated, and explores the possible roundness limits. The coupled dynamics model of the grinding system, which takes into account the radial runout error of the headstock and tailstock spindles, the axis offset of the headstock and tailstock movable centers, the grinding wheel spindle runout error, and the initial workpiece profile roundness error, is firstly established. A quantitative simulation of the transition process of the workpiece external profile formation is realized by proposing a cyclic iterative convergence algorithm based on the Newmark-β numerical integration method. A full-liquid hydrostatic spindle support structure grinding system is developed, and the validity of the developed model and the proposed algorithm is confirmed by comparing the grinding experiments with the grinding roundness simulation conclusions. Finally, based on the proposed model and simulation algorithm, the influence law of each grinding system error on the grinding roundness is investigated, and the achievable grinding roundness limit is predicted on this basis.

Key words: precision grinding, liquid hydrostatic support, movable center clamping, grinding dynamics model, grinding circularity limit

CLC Number:

TH133
TG584

XIONG Wanli, ZENG Xu, ZHANG Hanqian, LI Yuanyuan, YUAN Shuai, JIN Zhixin. Grinding Rounding Law and Roundness Limit Prediction of Fully Hydrostatic Supported Grinding System[J]. Journal of Mechanical Engineering, 2023, 59(21): 85-98.

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