Modares Mechanical Engineering

Modares Mechanical Engineering

Eccentric lap plate mechanism for ceramic balls lapping

Authors
Mohammad Reza Darmiyani
Hossein Amirabadi
Birjand university, Birjand.
Abstract
Among the pieces are ceramic balls that are special because of the physical and mechanical properties that have been the industry's attention. Ceramic balls are produced by powder metallurgy way. Finally, by grinding, lapping and polishing processes is reached to surface smoothness, roundness and diameter of the desired. Since the required finishing process to ceramic finishing for surface quality and geometry accuracy of the desired is Time consuming and expensive, creating an economical finishing way is an important issue in the application of ceramic balls. In this article, a mechanism for ceramic balls lapping is proposed. Proposed mechanism consist of two lap plates. Lower lap plate has an eccentric v-shaped groove and placed on out of upper lap plate rotation center. Kinematic analysis of proposed mechanism has been done and lapping trajectory has been investigated on the ball surface. The results of kinematic analysis and lapping trajectory show that the proposed mechanism increases removal rate and roundness of the ball. In general, efficiency and productivity of balls lapping process will improve to achieve the desired surface smoothness and roundness. It can increase the speed of operation and reduce the process time by increasing removal rate.
Keywords
Lapping
Ceramic balls
Kinematic analysis
Lapping trajectory
[1] O. Sunanta, Flat Surface Lapping: Process Modeling in an Intelligent Environment, PhD Thesis, University of Pittsburgh, 2002.
[2] A. Uplaonkar, Experimental Investigation of Unbonded Magnetic Abrasive Polishing (UMAP) of Silicon Nitride Balls, PhD Thesis, Oklahoma State University, 2005.
[3] T. Kurobe, T. Morita, N. Tsuchihashi, Super fine finishing ceramic ball using spin angle controlled machining method, Journal of the Japan Society for Precision Engineering, Vol. 70, pp. 1392-1396, 2004.
[4] J. Kang, M. Hadfield, A study on the lapping of ceramic balls, WIT Transactions on Engineering Sciences, Vol. 25, pp. 389-399, 1999.
[5] B. Zhang, A. Nakajima, Spherical surface generation mechanism in the grinding of balls for ultraprecision ball bearings, Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, Vol. 214, pp. 351-357, 2000.
[6] R. T. Lee, Y. C. Hwang, Y. C. Chiou, Lapping of ultra-precision ball surfaces. Part II. Eccentric V-groove lapping system, International Journal of Machine Tools and Manufacture, Vol. 46, pp. 1157-1169, 2006.
[7] W. Ma, High Efficiency Ultra-Precision Grinding of Ceramic Balls, PhD Thesis, Saga University, 2013.
[8] T. K. Doi, T. Kasai, H. K. Tonshoff, 6 - Lapping and Polishing, Handbook of Ceramic Grinding & Polishing, pp. 354-442, ed Norwich, NY: William Andrew Publishing, 1999.
[9] J. Kang, M. Hadfield, A novel eccentric lapping machine for finishing advanced ceramic balls, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 215, No. 6, pp. 781-795, 2001.
[10] M. Feng, Y. Wu, J. Yuan, Z. Ping, Processing of high-precision ceramic balls with a spiral V-groove plate, Frontiers of Mechanical Engineering, Vol. 12, No. 1, pp. 132-142, March 01, 2017.
Modares Mechanical Engineering
Volume 18, Issue 1
March 2018
Pages 265-272