1.

その他

その他
佐藤, 昌彦
出版情報: 博士学位論文要旨 論文内容の要旨および論文審査結果の要旨/金沢大学大学院自然科学研究科.  平成11年6月  pp.439-449,  1999-06-01.  金沢大学
URL: http://hdl.handle.net/2297/16254
概要: 取得学位:博士(工学),学位授与番号:博乙第189号,学位授与年月日:平成11年3月25日,学位授与年:1999
2.

論文

論文
上田, 隆司 ; 金田, 泰幸 ; 佐藤, 昌彦 ; 杉田, 忠彰
出版情報: 日本機械学會論文集 C編 = Transactions of the Japan Society of Mechanical Engineers Series C.  58  pp.302-309,  1992-01-25.  The Japan Society of Mechanical Engineers = 日本機械学会
URL: http://hdl.handle.net/2297/36973
概要: The fundamental characteristics of a new type of infrared radiation pyrometer using an optical fiber are investigated theoretically and experimentally. The structure of this pyrometer is that the optical fiber accepts the infrared flux radiated from the object and transmits it to an infrared detector InSb cell. This I. R. P. is suitable for measuring the temperature of a very small object whose temperature changes rapidly. The flexibility of the optical fiber also makes it possible to measure the inner temperature of the object by drilling a microscopically fine hole in it and inserting the fiber. Three types of optical fiber were employed : quartz fiber, fluoride fiber and chalcogenide fiber. The main results obtained are as follows. The setting location of the fiber is independent of the total energy Accepted by the fiber, even if the object of a flat surface is not placed vertically to the axis of the fiber. This result is also applied to the object of a curved surface. The target area of the graded-index fiber is smaller than that of the step-index fiber when they are placed at a same distance from the object. The I.R.P. with the chalcogenide fiber can be useful for temperatures above 50°C. 続きを見る
3.

論文

論文
佐藤, 昌彦 ; 上田, 隆司 ; 田中, 久隆
出版情報: Journal of the Japan Society for Precision Engineering, Contributed Papers = 精密工学会誌論文集.  71  pp.1437-1441,  2005-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38633
概要: The temperature on the rake face of a binder-less cBN tool tip in end-milling was measured using a fiber-optic two-color pyrometer. The radiation of the interface between the tool tip and the chip is transmitted through the binder-less cBN and accepted by the optical fiber located behind the tool tip. The radiation accepted is transmitted to a two-color detector, which consists of a InAs and InSb detector, through a rotary fiber coupler. The coupler makes it possible to transmit the radiation outside the milling machine. The fundamental transmission characteristics of the coupler was investigated theoretically and experimentally. This method was found to be very practical to measure the tool tip temperature in end-milling. The results obtained are as follows. The rake face temperature in the up-milling of 0.55% carbon steel ranged from 480 degrees centigrade to 560 degrees centigrade for the cutting speeds of 2.2 m/s to 4.4 m/s. The cutting temperature increases with the increase of cutting speed. The temperature in down-milling is higher a little than that in the up-milling. バインダレスcBNによるエンドミル加工時の工具刃先温度を光ファイバ型2色温度計を用いて測定している. 工具すくい面から放射される赤外線を工具裏面から受光し, 2本の光ファイバを連結する回転型ファイバカプラを介して伝送することにより, 高速回転している刃先の温度測定を可能にしている. 切削速度や切削方式の相違が刃先温度に及ぼす影響について検討している. 続きを見る
4.

論文

論文
佐藤, 昌彦 ; 上田, 隆司
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  67  pp.1850-1855,  2001-11-05.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38881
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 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. 続きを見る
5.

論文

論文
上田, 隆司 ; 佐藤, 昌彦 ; 杉田, 忠彰
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  61  pp.1448-1452,  1995-10-05.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38879
概要: Temperature of interface between a cutting tool and a workpiece is measured using two-color pyrometer with a fused fiber coupler. A conical tool is used as the cutting tool which is made of translucent alumina sintered under HIP, and 0.55% carbon steel is used as a workpiece. The infrared rays radiated from the interface and transmitted through the conical tool are accepted by a fused fiber coupler and led to two infrared detectors of different spectral sensitivity. Temperature is obtained by calculating the ratio of the output voltage from these two detectors. The results obtained are as follows. The temperature increases very rapidly and reaches 1000°C at about 40 μs after the beginning of cutting. The rate of increase of temperature is very great : about 108 °C/s at the cutting speed of 1 500 m/min. The temperature increases with the increase of cutting speed, but at a speed faster than 1000 m/min its influence is small. The temperature shows a tendency to saturate about 1300-1400°C as the cutting speed increases. 続きを見る
6.

論文

論文
上田, 隆司 ; 荻野, 健太郎 ; 山田, 啓司 ; 細川, 晃 ; 佐藤, 昌彦
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  68  pp.430-434,  2002-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38818
概要: The water-solution type coolant is used instead of ordinary. oil type coolant and the effect of the coolant on the finishing is investigated experimentally. As work materials, titanium, titanium alloies and Ni-based alloy are used. Electrolytic in-process dressing is employed to promote the ability of metal removal because the water-solution type coolant is inferior to that of oil type one in the permeability. The specific cutting energy k s of these materials are compared with k s of a bearing steel in order to evaluate the machinability of the work materials. The results obtained are as follows. The superfinishing opera-tion using a water-solution type coolant is the effective method to finish the surface of these difficult-to-cut materials when the electrolytic in-process dressing is applied together. The suitable conditions in electrolytic dressing for each work material are obtained, and the titanium which has the highest adhesive property needs the strongest electrolysis among the work materials used in this study. The electrolytic-in-process dressing makes it possible to maintain the cutting ability of the finer grain size stone for a long time, and to obtain the mirror surface of Incoloy 800 with #8000 SD diamond stone. 続きを見る
7.

論文

論文
佐藤, 昌彦 ; 上田, 隆司 ; 西田, 昌弘
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  64  pp.892-896,  1998-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38805
概要: Tool face temperature of single crystal diamond in high precision orthogonal cutting of aluminum and copper is measured using two-color pyrometer with an optical fiber. The infrared rays radiated from the chip-tool interface and transmitted through the diamond tool are accepted by an optical fiber and led to two-color detectors of different spectral sensitivity. Temperature distribution on the tool face is analyzed by employing finite element method and calculated results are applied to the estimation of the maximum temperature on the tool face. The results obtained are as follows; (1) The technique developed is suitable for measuring the tool face temperature in single crystal diamond cutting. (2) Output wave of temperature was clearly recorded. The tool face temperature measured is approximately 190°C for Al and approximately 220°C for Cu when cutting speed was about 620m/min. (3) The temperature increases with the increase of cutting speed. (4) The temperature on the tool face measured is in good agreement with that calculated. 続きを見る
8.

論文

論文
佐藤, 昌彦 ; 上田, 隆司
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  67  pp.839-843,  2001-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38766
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 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. 続きを見る
9.

論文

論文
上田, 隆司 ; 佐藤, 昌彦 ; 金田, 泰幸 ; 杉田, 忠彰
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  60  pp.383-387,  1994-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38764
概要: A temperature at the tip of a conical cutting tool is measured immediately after micro chip forming using an infrared radiation pyrometer with an optical fiber. The fundamental structure of this pyrometer is that the infrared flux radiated from the tip of the conical cutting tool after cutting is accepted and transmitted to an infrared detector InSb by an optical fiber. The measurement accurancy when applying the pyrometer to the experiment is investigated theoretically. The temperature at the tip of the conical tool at various cooling times after cutting is measured using this pyrometer. A carbon steel and a tungsten are used as workpieces. A cooling characteristic of the tool is analyzed by heat transfer theory. Applying the theoretical results to the experimental results, the temperature of the tip of the conical tool just after cutting is estimated to be 1500°C for carbon steel and 2400°C for tungsten; 1500°C is almost equal to the melting point of carbon steel. 続きを見る
10.

論文

論文
上田, 隆司 ; 佐藤, 昌彦 ; 杉田, 忠彰
出版情報: 精密工学会誌 = Journal of the Japan Society of Precision Engineering.  62  pp.120-124,  1996-01-01.  精密工学会 = The Japan Society for Precision Engineering
URL: http://hdl.handle.net/2297/38765
概要: The influence of cutting speed, and thermal properties of the work material and the tool material on the thermal partition coefficient is investigated theoretically and experimentally. The temperature at the top of a conical tool is measured immediately after micro chip forming using an infrared radiation pyrometer with an optical fiber. A carbon steel, a titanium, a molybdenum and a tungsten are used as work materials, and a silicon nitride Si3N4, a zirconia ZrO2 and a diamond are used as tool materials. The cutting temperature increases in proportion to the 1/2 power of cutting speed and saturates to the melting point of work material. The fraction of heat conducted into the cutting tool is independent on the cutting speed, and it becomes larger as the thermal conductivity of workpiece is smaller or that of tool material is larger. In the diamond tool which has the highest thermal conductivity, its thermal partition coefficient is the highest, but the tool tip temperature is the lowest. 続きを見る