By Don E Bray; American Ceramic Society.; Wiley InterScience (Online service)
Read Online or Download 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures A[-B] : January 20-24, 1998, Cocoa Beach, Florida PDF
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Extra resources for 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures A[-B] : January 20-24, 1998, Cocoa Beach, Florida
Operation Principle of Tangential-feed Centerless Grinding Performed on Surface Grinder Fig. 1 shows the operation principle of the new centerless grinding technique and the detailed construction of the grinding unit. The unit is composed mainly of an ultrasonic shoe and its holder, a blade and its holder, and a base plate, and is fixed onto the worktable of a surface grinder via an electromagnetic chuck. A workpiece constrained between the unit and the grinding wheel is fed right-toward with the movement of the worktable.
35 A Two-dimensional Ultrasonically Assisted Grinding Technique for High Efficiency Machining of Sapphire Substrate Z. Liang1,2, a, Y. Wu2, b, X. Wang1,c, Y. Peng3,d, W. Xu2,e and W. cn Keywords: Elliptical ultrasonic vibration, Grinding, Sapphire, Grinding force, Roughness Abstract. This paper discusses the feasibility of improving machining efficiency of sapphire substrate by using two-dimensional (2D) ultrasonic vibration assisted grinding. An elliptic ultrasonic vibrator is designed and produced by bonding a piezoelectric ceramic device (PZT) on a metal elastic body (stainless steel, SUS304).
In the mean time, the workpiece rotational speed nw is controlled by the elliptic motion on the shoe end face. In this model, several assumptions are given: (1) The workpiece contacts constantly with the blade and the shoe at points B and C, respectively, during grinding; (2) The vibration of the entire machine is too small to be regarded, and no chatter occurs on the machine due to the ultrasonic elliptic vibration of the shoe; (3) The workpiece rotation is always stable, and no variation happens on the rotational speed during grinding; (4) The wear of the grinding wheel is too small to be recognized and the grinding wheel radius is kept constant during grinding.