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安藤, 明珠
概要:
We made a collaboration with Otsuka Ohmi Ceramics Co .. ,LTD and Incorporated Company SA WATETSU for development of exquisite replication of ceramics. Othuka Ohmi was mainly provide base ceramic and reconstruction of color. Sawatetsu
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developed the reconstruction of the surface roughness. We, Research Center of Italian Mural Paintings, Kanazawa University took a part of validation of surface roughness and color. The target of the mural paintings was chosen "St. Nicola" which was drawn in the church ofVesita's house.
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安藤, 明珠 ; 株式会社サワテツ
概要:
Our purpose is to reconstruct the surface roughness with higb accuracy as much as we can. To make 30 machined operation, there were three problems that we had to solve. (1) Data size: too big to create operation program, (2) cutting tools:
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the consideration of the balance benveen durability of the tool, cutting time, reconstruction accuracy, (3) cutting amount. By 3D editing software, the data was modified as optimum data sets. And through a trial and error process, we selected 0.5mm diameter cutting tool for our reconstruction.
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安藤, 明珠
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宮下, 明珠
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田中, 隆太郎 ; 西本, 秀人 ; 田中, 大輔 ; 古本, 達明 ; 細川, 晃 ; 上田, 隆司
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田中, 隆太郎 ; 林, 勇伝 ; 田邉, 一真 ; 上田, 隆司 ; 細川, 晃
概要:
This study deals with the trial for improvement of chip controllability in turning with selective laser heat treatment for workpiece. Selective heat treatment for carbon steel JIS S45C was carried out with Nd:YAG laser which
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could be transmitted through an optical fiber and shows higher absorption rate against carbon steels than CO2 laser. In turning of these selective laser heat threatened carbon steel, the chip form changed regular curl from irregular curl and chip breakability was improved compared with non-laser treated carbon steel. Surface roughness was obviously smaller comparing with non-laser treated carbon steel. Especially in the case that the depth of cut was larger, the surface roughness was smaller. As for cutting force, the principal force was slightly smaller, but the thrust force and feed force were almost the same. The cutting temperature was slightly lower. The tool wear was almost same as that in the case of non-laser treated carbon steel.
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| 7.
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佐藤, 昌彦 ; 上田, 隆司
概要:
In this paper, the activity of effective cutting grains in cutting of work and the activity of effective cutting grains in generation of finished surface are described. The former was investigated by the measurement of wheel surface
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temperature immediately after grinding using infrared radiation pyrometer with an optical fiber and the latter was investigated by the measurement of finished surface roughness using three-dimensional surface roughness tracer respectively. These activity of cutting grains in the whole circumference of wheel surface was clarified. The results obtained are as follows: 1) Cutting grains which have effective concern with cutting of work certainly act in every rotation of wheel. 2) The number of effective cutting grains in cutting of work increases as wheel depth of cut increases. 3) Cross-sectional shape of scratch toward grinding direction on the finished surface accurately correspond in the every period of one circumference of wheel in the order of sub-micrometer. 4) Finished surface is generated by some identical cutting grains even when wheel depth of cut increases.
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| 8.
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細川, 晃 ; 織田, 正人 ; 眞下, 和史 ; 佐久間, 邦郎 ; 山田, 啓司 ; 上田, 隆司
概要:
In this study, a new technique of in-process evaluation of the wheel surface is proposed. Five specified wheel surfaces are prepared as the references via the appropriate dressing procedure, and grinding sounds generated by these wheels
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are discrimi-nated by analyzing the dynamic frequency spectrum with a neural network technique. In the case of conventional vitrified-bonded alumina wheel, grinding sound can be identified under the optimum network configuration in such that learning rate is 0.0029 and number of hidden layer is 420. This system can recognize instantaneously the difference of the wheel surface in a good degree of accuracy insofar as the dressing conditions are relatively widely changed. In addition, the network perceives the wheel wear because the grain tips are flattened as grinding proceeds and the grinding sound resembles to that of the wheel generated with lower dressing feed.
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佐藤, 昌彦 ; 上田, 隆司
概要:
In turning of platinum alloy Pt850, the wear behavior of tools and the cutting characteristics of Pt850 are investigated experimentally. K10 carbide, cermet, ceramics and PCD are used as tool materials. K10 carbide and cermet are not
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suitable for the cutting of this material because severe wear on the tool flank was observed after a few second of cutting, that is, the width of the flank wear land was about 1 mm after 10 seconds cutting. The width of wear land of Al2O3 and Si3N4 ceramic tools was small compared with K10 carbide tool, but the cutting forces increased rapidly as the cutting proceed. PCD tool can be used for cutting of Pt850 because the width of flank wear land is much small compared with other tool materials used in this experiment and the increasing rate of cutting force is not so great. The influence of cutting speed on the flank wear of PCD tool is small. The surface roughness of work material Pt850 becomes lower when the smaller feed rate is chosen as a cutting condition and the cutting tool of larger radius corner is used.
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黒部, 利次 ; 森田, 知之 ; 土橋, 尚久
概要:
Spin angle controlled ball lapping method developed recently, is to have an excellent performance to finish the ball, in which V-groove lapping plate is separated into two parts and three plates are able to rotate independently.
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However, lapping of ceramic ball such as a silicon nitride one is very hard. Present paper focuses on both of the grinding characteristics and polishing ones of a silicon nitride ball. Grinding is conducted using the diamond wheels with grain size degradation, and then polishing is performed with very fine diamond of average grain size of nano-meter. It is found that the grain size degradation grinding method has very effective performance of finishing of the silicon nitride ball. Polishing of the ceramic ball with slurry mixed super fine diamonds into an ion-exchanged water yields higher decrease of nano-meter level of surface roughness. Spin angle controlled finishing method describes that higher finishing performance rather than conventional one.
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