| Project/Area Number |
13450059
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機械工作・生産工学
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
KATO Masana Akita Prefectural University, Dept.Of Machine Intelligence & systems Engineering, Prof., システム科学技術学部, 教授 (60005262)
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| Co-Investigator(Kenkyū-buntansha) |
NOMURA Mitsuyoshi Akita prefectural University, Dept.Of Machine Intelligence & Systems Engineering, Assistant, システム科学技術学部, 助手 (70325942)
WU Yongbo Akita Prefectural University, Dept.Of Machine Intelligence & systems Engineering, Assistant Prof., システム科学技術学部, 講師 (10302176)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2002: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | centerless grinding / ultrasonic vibration / Cermics balls / regulating wheel |
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| Research Abstract |
Machineries with ultra-high speed rotation mechanism such as the jet engine of aircraft and rocket and the spindle of machine tools require strongly ceramics bearings since ceramics is a kind of engineering material that is extremely resistant to corrosion and abrasion and exhibit low thermal conductivity and high resistance to extreme temperature. However, even its excellent property ceramics bearing are not yet used widely in industry. It is considered this is due to the high cost of machining the ceramics balls. This project is aimed at the development of a new technique to machine ceramics balls, i.e., successive grinding technology for ceramics balls by Centerless grinder. In this method, an ultrasonic elliptic vibration shoe is employed to support the workpiece and to control the aorkpiece rotational speed around X-axis instead of using a regulating wheel, and the rotational speed of workpiece around Y-axis is controlled by an ultrasonic elliptic vibration on the blade. In this w
… More
ork, preliminary to ceramics balls machining, an experimental apparatus capable of the machining of pin-shaped workpiece is developed based on a conventional centerless grinder, and fundamental investigations are performed theoretically and experimentally. Then, Simulation analysis of ball's sphericizing process are conducted to determine the layout of an experimental setup for ball centerless grinding. The obtained results can be summarized as bellows.
(1)An ultrasonic elliptic vibration shoe/blade composed of a PZT device and a metal plate were designed and constructed.
(2)The performance in the elliptic motion of shoe/blade has been investigated with a laser vibrometer when the AC voltage is applied for various voltages and frequencies.
(3)A fine feeding unit composed of a ball screw, a stepping motor, a linear guide and a shoe holder have been designed and produced.
(4)Preliminary to balls grinding, an experimental apparatus for pin-shaped workpiece has been constructed by installing the ultrasonic shoe and the fine feeding unit on an existing centerless grinder.
(5)Tests of rotationally driving the workpieces with sizes of 5mm in diameter have been conducted on the constructed apparatus. It is confirmed that the workpiece rotational speed can be controlled with the elliptic motion of the end of shoe.
(6)Grinding tests involving pin-shaped workpiece have been carried out on the produced experimental apparatus. The roundness of workpiece improved from the initial value of 20μm to the final one of 1.5μm, confirming the validity of the new method.
(7)A computer simulation analysis method has been developed to investigate the ball's sphericizing process. The layout of the ball centerless grinding setup has been determined by the simulation analysis. Less
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