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| 1.
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論文
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上田, 隆司 ; 金曽, 久佳 ; 杉田, 忠彰
概要:
Both an evaluating function d to present the overall severity of superfinishing conditions and an equation ks to calculate the specific finishing energy are derived theoretically, assuming that one stick corresponds to a single point
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tool with a long cutting edge. Some experiments are carried out to confirm the propriety of these results. The ks-d relation calculated from the experimental results is useful in the evaluation of the machinability of work materials and the cutting ability of the stick. Moreover, this relation makes it possible to compare the superfinishing in the production rate and the surface refinement with the honing.
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| 2.
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論文
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上田, 隆司 ; 金曽, 久佳 ; 松森, 昇 ; 杉田, 忠彰
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| 3.
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論文
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上田, 隆司 ; 金曽, 久佳 ; 大野, 誉洋 ; 杉田, 忠彰
概要:
Influence of the grain size of diamond stone on the superfinishing performances is investigated experimentally. The mechanism of chip formation is investigated by observing the shape of chips and the finished surfaces of workpiece with
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scanning electron microscope. The work materials used are alumina (Al2O3), silicon carbide (SiC), silicon nitride (Si3N4) and zirconia (ZrO2), which are sintered under the atmospheric pressure, and Mn-Zn ferrite, which is sintered under HIP. The grain size of stone is changed from # 500 to # 8 000. The results are as follows. The diamond stone with suitable bonding strength makes it possible to remove the work material as chips even if its grain size is finer than # 1 000. Two types of chips are obserbed; one is the crack-type chips which are made by brittle fracture, and the other is the flow-type chips which are made by plastic deformation. As the grain size of stone becomes smaller, the shape of chips changes from crack-type to flow-type. The critical grain size is dependent on the work materials and it becomes smaller in the order of ZrO2, Mn-Zn ferrite, Al2O3, Si3N4 and SiC. The condition of making the flow-type chips is important to obtain the mirror surface of ceramics.
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