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藤村善雄, 安井武司著
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工作機械技術研究会編 ; 安井武司監修
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工作機械技術研究会 ; 安井, 武司
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金沢大学・大学教育開放センター編集
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ハイラム・E.グラント著 ; 安井武司訳
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工作機械技術研究会編
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田中, 秀岳 ; 安田, 嘉和 ; 鈴木, 直彦 ; 坂谷, 勝明 ; 安井, 武司 ; 平尾, 政利
概要:
The study deals with a development of an electric power chuck system for CNC lathe. Today, almost power chuck system for CNC lathes are used with hydraulic system included with hydraulic fluid which causes the environment pollution.
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Besides, not only the hydraulic pump always wastes energy, but also its heat transfer causes thermal deformation and deteriorates machining accuracy. In the study, in order to remove the hydraulic pump system from CNC lathe, the electric power chuck system which is able to adopt to the general CNC lathe and to have enough capability as general hydraulic power chuck system are developed. The electric power chuck system adopt to alternate general hydraulic pump system. From the experimental result, the developed electric power chuck system is found to have enough abilities. In addition, the electric power chuck system aims to improve machining accuracy by intercepting heat transfer and environmental pollution as well as removing the hydraulic system from machine tools.
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平尾, 政利 ; 寺島, 淳雄 ; 朱, 浩允 ; 白瀬, 敬一 ; 安井, 武司
概要:
Many researches about cutting temperature have been reported, because of the great influence of a tool face temperature
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on a tool wear. However, there is few report about cutting heat. The cutting conditions (cutting speed, feed, etc.) and accuracy of temperature measurement in recent cutting are quite different from those in the past. In case of cutting a material like aluminum, for instance, the cutting speed is usually adopted as 1000m/min much higher than that in the past. The behavior of cutting heat (heat into chip, work and tool) in high speed cutting has been investigated applying theory and experiment methods in the present study. The heat generated in the cutting process is distributed to three parts such as main shear plane, rake face and clearance face. In this experiment, the work materials are AISI 1045 steeland Aluminum alloy A5052, and each cutting speed is up to 400m/min and 850m/min. The cutting heat are measured by accurate thermometers at different depths of cut and flank contact lengths. In addition, the heat ratio of chip, work and tool is calculated from theory. Experimental data are similar to theoretical results. Results of this research show that higher the cutting speed, higher the percentage of heat into the chip and lower the percentage of heat in the tool and work. (1) 切込みや逃げ面接触長さを変化させることにより, 切屑, 被削材, 工具への切削熱の流入割合を求めることができた. (2) 切削熱の切屑への流入割合は, 切削速度の上昇とともに増加し, 被削材, 工具へは減少していく. (3) 高速切削になるにつれて, 逃げ面での摩擦による発熱は無視できなくなる.
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論文
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白瀬, 敬一 ; 平尾, 政利 ; 安井, 武司
概要:
Instantaneous force with static deflection feedback model is applied to predict cutting force and dimensional surface error generation in peripheral milling with irregular tooth pitch end mills. It is demonstrated that the irregular
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tooth pitch end mill reduces the dimensional surface errors according to the chip regeneration mechanism. Unlike in case of uniform tooth pitch cutters, chip loads on each flute are different in milling with irregular tooth pitch cutters. The excess surface error generated by the flutes which have larger chip loads is removed by the following flutes which have smaller chip load due to the irregular tooth pitch. In order to predict precise cutting force and dimensional surface error for the irregular tooth pitch end mill, the chip regeneration mechanism or the static tool deflection has to be considered to derive the accurate chip loads. Predicted cutting force and dimensional sur face error show good agreement with experimental results. Up to 20% reduction in surface errors is achieved by using the irregular tooth pitch end mills tested.
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平尾, 政利 ; 井澤, 正樹 ; 井口, 信明 ; 白瀬, 敬一 ; 安井, 武司
概要:
A new experimental method of in-process dressing has been conducted by means of water-jet, as well its application investigated in the present study. While the workpiece is difficult to be ground by the surface grinding machine, the high
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pressure waterjet is supplied to the grinding wheel as a supplementary method. The principle of this method can be simply described as that the waterjet is a kind of processing technique, which is able to strip the chips on the surface of the grinding wheel without damaging it by adjusting the injection pressure and stand-off distance. The dressing effects are examined according to the surface conditions of the grinding wheel and ground workpiece by a surface roughness and profile measuring device and a microscope. Because of the complexity of the interaction influences between the jet pump pressure and the stand-off distance on the dressing results, in this report at fixed stand-off distance condition the effects of the jet pressure on the grinding wheel of CBN #325 and finished surface of Ti6A14V materials have been clarified. From the results of the experiments, it was found that the dressing life time of the grinding wheel and the roughness of the ground material finished surface have been improved distinctly when the injection pressure is 107.1MPa at stand-off distance 20mm. On the other hand much lower pressure will have no influence on dressing results, and much higher one will damage the CBN wheel.
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