1987 Fiscal Year Final Research Report Summary
Study on Finishing of Curved High Performance Ceramic Surface by using a Semispherical Diamond Grinding Tool
| Project/Area Number |
61550087
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械工作
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| Research Institution | Hokkaido University |
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Principal Investigator |
MIYOSHI Takashi Faculty of Engineering, Hokkaido University, 工学部, 助教授 (00002048)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Katsumasa Faculty of Engineering, Hokkaido University, 工学部, 教授 (40001169)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Ceramics / Diamond grinding tool / Dual-axis grinding / Mold cavity / Spherical grinding wheel / 曲面仕上加工 |
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| Research Abstract |
The purpose of this research project is to first develop a dual-axis spherical diamond grinding tool for finishing the curved high performace ceramic surfaces, secondly study the finishing mechanism and properties of the dual-axis grinding tool in which the semi-spherical (or a part of spherical body) diamond grinding wheel can be revolve on both the main spindle and the wheel axis at the same time.
The grinding experiments for example Si_3N_4 and Al_2O_3 ceramics are carried out by using the developed grinding tool directly attached to the main spindle of the N/C milling machine tool. On the other hand, in order to examine the breaking strength of the ground Al_2O_3 ceramics, the three-points flexural strength tests are done.
The results obtained are summarized as follows.
(1)By dual-axis grinding the vertical surfaces of Si_3N_4 ceramics with the semispherical diamond wheel, we can obtain the surface roughness of less than 5<micrn>mRz and the stock removal corresponding to the given depth of cut.
(2)By the dual-axis diamond grinding wheel with the part of spherical body, the surface roughness of about 1.3<micrn>mRz and 2.4<micrn>mRz can be obtained for the plane surfaces and the vertical surfaces of Al_2O_3 ceramics respectively. The normal forces are relatively small values of about 7N for the plane surfaces and 4N for the vertical surfaces.
(3)By the tree-points flexural strength tests of Al_2O_3 ceramics, the average values of flexural strength are 50 kgf/mm^2 for the plane surfaces and 41 kgf/mm^2 for the vertical surfaces. It is noticed that the strength for the vertical surfaces is rather higher than that of general Al_2O_3 ceramics (about 40 kgf/mm^2).
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