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| 1.
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田中, 隆太郎 ; 上田, 隆司 ; 細川, 晃 ; 林, 勇伝 ; 山田, 啓司
概要:
This study deals with the machinability of steels after heat treatment with CO2, laser using h-BN powder and blast furna
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ce slug as absorbent. h-BN is well known as solid lubricant. As for blast furnace slug, its composition is similar to that of inclusions in calcium dioxide steel that shows good machinability. The absorbance of slug and h-BN were more than 80%, so it is said that these powders can be used as absorbent for CO2, laser. Only in the case of h-BN, absorbent was melted into substrate and its depth was about 200 μm. When turning the steels after laser heat treatment using h-BN power and blast furnace slug as absorbent, carbide tool showed smaller tool wear than the case of carbon type absorbent. In the profile of the machined surface, there was a wave of about 5 μm in amplitude and its wavelength was equal to the feed rate of laser in heat treatment. This is because the workpiece surface after laser heat treatment has a periodic distribution in hardness. The hardness in the surface layer of workpiece was higher than that of the substrate.
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| 2.
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山田, 啓司 ; 小谷, 祐司 ; 上田, 隆司
概要:
The temperature of workpiece irradiated with CO2 laser is measured using a new type of infrared radiation pyrometer with an optical fiber. In the pyrometer, a chalcogenide optical fiber and a two-color detector which consists of InSb and
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InAs detector are used. The power intensity of the laser beam during the exposure time and the two dimensional picture of the intensity distribution of the laser beam are measured experimentally. The measuring system for the intensity distribution of laser beam consists of MCT cell and an optical fiber. The temperature distribution on the workpiece irradiated with laser is calculated numerically using FEM for unsteady state. The change of physical properties of materials is considered. Comparing the experimental results with the calculated ones, the absorptivity of the work material for CO2 laser is obtained.
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| 3.
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上田, 隆司 ; 入山, 孝宏 ; 杉田, 忠彰
概要:
A new type of Infrared Radiation Pyrometer using a fused fiber coupler is made, and its characteristics are investigated theoretically and experimentally. This pyrometer can be applied to measure the flush temperature of a small area on
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ceramics (PSZ) when it is irradiated with CO2 laser. In this pyrometer, the infrared rays radiated from the object are accepted by an optical fiber, and divided into two parts and transmitted to the two types of infrared detectors by a fused fiber coupler. The temperature is obtained by calculating the ratio of the output voltages from these two detectors. The characteristics of this pyrometer are as follows. It is possible to measure the temperature with controlling the disturbance of the emissivity. When the object has a surface of uniform temperature, the measuring temperature does not depend on the size of the object. In the case when the object has the distribution in temperature, it is possible to estimate the maximum temperature correctly from the experimental results.
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| 4.
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森田, 精一 ; 山田, 啓司 ; 細川, 晃 ; Al, Huda Mahfudz ; 上田, 隆司
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脇村, 嘉宏 ; 倉谷, 泰治 ; 上田, 隆司 ; 古本, 達明 ; 細川, 晃 ; 田中, 隆太郎 ; Wakimura, Yoshihiro ; Kuratani, Yasuharu ; Ueda, Takashi ; Furumoto, Tatsuaki ; Hosokawa, Akira ; Tanaka, Ryutaro
概要:
金沢大学理工研究域機械工学系<br />新しい矯正加工法としてCO2レーザを用いた矯正加工法を考案した。この方法は、レーザ照射部に発生する熱応力を利用して材料を塑性変形させて矯正する加工法である。レーザの持つ高いエネルギ密度、微小スポット径
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により高い精度で局所的な加工が行える。さらに入熱量も制御しやすいため自動化も容易である。<br />出版者照会後に全文公開
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| 6.
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榎本, 啓士 ; 稗田, 登 ; 上田, 隆司 ; 木村, 繁男
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上田, 隆司 ; 大森, 滋人 ; 杉田, 忠彰
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Using the honing machine, the influence of the honing head design on the out of roundness of workpiece is investigated experimentally. Experimental results for three and four-stick honing heads agree well with the theoretical results
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obtained in the 1st peport. In the case of the honing head with greater sticking, the simulation of honing operation is carried out using the micro computer and the results obtained are compared with the theoretical results.
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上田, 隆司 ; 山田, 啓司 ; 及川, 志郎 ; 細川, 晃
概要:
Laser forming is the thermal process to deform a metal plate using the thermal stress produced by the rapid heating with the laser. In this study, the influence of irradiating conditions of CO2 laser on the bending angle of the
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workpiece is investigated. The temperature at the back surface of the workpiece irradiated with CO2 laser is measured using a two-color pyrometer with an optical fiber. The temperature distribution in the workpiece is calculated using the FEM thermal analysis. Simple bending experiments with one-way laser scanning are carried out. Stainless steel SUS304 of various thickness is used as work material. The results obtained are as follows. The bending angle is proportional to the temperature of the workpiece irradiated. The temperature of workpiece increases with the increase of laser power, the decrease of feed rate of the laser beam and the decrease of plate thickness. After all, the bending angle becomes larger with the increase of laser power, the decrease of the feed rate and the decrease of the thickness of the plate. The temperature of the workpiece can be used as a signal to control the deformation of the workpiece.
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上田, 隆司 ; 山田, 啓司 ; 篠崎, 道 ; 細川, 晃
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Perforatability and thermal damages of dental hard tissues with two kinds of YAG laser are investigated for the purpose of making the cavity and forming the abutment tooth. The perforatability of dentin with laser beam depends on the
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absorptivity for laser beam, the laser power, the pulse duration and the number of laser pulses. Approximately 65% of Er:YAG laser beam is absorbed at irradiated surface of dentin, but the absorptivity for Nd:YAG laser beam is only 17%. High perforatability is accomplished using Er:YAG laser because of its higher absorptivity. There is a linear relation between the perforated depth and the number of pulses. Higher laser power and larger pulse duration improve the perforatability, in the same time, induce thermal damages on dental hard tissue such as thermal cracks and burning of dentin. Lower laser power and smaller pulse duration makes it possible to make fine cavities without thermal cracks and burning in even with Nd:YAG laser.
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| 10.
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上田, 隆司 ; 佐藤, 昌彦 ; 杉田, 忠彰
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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
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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.
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