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1990 Fiscal Year Final Research Report Summary

Development of Ultra High Precision Bearing Mechanisms

Research Project

Project/Area Number 01550090
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 機械工作
Research InstitutionNagaoka University of Technology

Principal Investigator

KYUSOJIN Akira  Nagaoka University of Technology, Department of Mechanical Engineering, Professor, 工学部, 教授 (20016661)

Project Period (FY) 1989 – 1990
Keywordscylindrical lapping / roundness / polygonal hole / bearing / tripod roundness measuring method / whirling
Research Abstract

In the precision measurring instruments and dividing machines polygonal shafts and holes have been used to make specially-made bearing mechanisms. In the bearing mechanisms of the famous "TALYROUND", spherical shape for lower part and three-point-contact type for upper part are used. These polygonal shapes are good for vibration characteristics and anti-whirling. Lapping has been used as a finishing mechanism to improve roundness accuracy of cylindrical shafts and holes. However, little has been published on the theoretical analysis of the finishing mechanism for high precision polygonal cross sections. This research offers two methods for finishing polygonal holes, whose shapes are ellipsoidal, triangular, four-protrusion and so on. By one method, the amplitude of the interest Fourier component of out-of-roundness keep constant, while the other components are decreased, using "regular polygonal lap". By the other method, the amplitude can be increased for any Fourier component using special types of lapping tools produced by applying the "Tripod" roundness measuring method. Using one of the tripod lapping tools, the magnitude for the four-protrusion component was increased from 7.64mum to 8.27mum, while the other components were decreased. Out-of-roundness improved from about 40mum to about 30mum. This study shows that any component of the out-of-roundness can be increased, based on a theoretical analysis, as a result many improvements on the new lapping methods, called "tripod lap".

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 久曽神 煌,渡部 浩司: "非真円断面穴のラップ仕上" 精密工学会誌. 56. 1723-1728 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KYUSOJIN, Akira and WATANABE, Kouji: "High Precision Lapping for Polygonal Holes" JOURNAL OF THE JAPAN SOCIETY OF PRECISION ENGINEERING. VOL. 56, NO. 9. 1723-1728 (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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