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細川, 晃 ; 南部, 彰 ; 田中, 隆太郎 ; 山田, 啓司 ; 上田, 隆司 ; Hosokawa, Akira ; Nambu, Akira ; Tanaka, Ryutaro ; Yamada, Keiji ; Ueda, Takashi
概要:
金沢大学理工研究域機械工学系<br />前報では光ファイバ型2色温度計を用いてエンドミル加工におけるオイルミスト供給時の工具逃げ面温度を測定し,ミスト粒径,ミスト流量,ミスト供給位置が工具逃げ面温度に及ぼす影響について検討した.本報では,そ
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の第3段階として,超硬工具およびコーティング工具における切削温度と工具損耗量を測定し,オイルミスト供給が工具損耗形態に及ぼす影響について詳細に検討している.<br />出版者照会後に全文公開
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山崎, 修平 ; 田中, 隆太郎 ; 細川, 晃 ; 上田, 隆司 ; 古本, 達明
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タッピングは加工の最終工程に行われるため，タップが折損して製品に取り残されるなどの失敗は許されない．折損が発生する主な原因は工具摩耗である．したがって工具摩耗に大きな影響をおよぼす工具刃先温度の測定は重要である．しかし，タップ加工の温度測定
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に関する研究はほとんど行われていないのが現状である．そこで本研究では2色温度計を用いた加工温度測定システムの確立を試みた． In this study, the method for measurement of the tool edge temperature in tapping was proposed. The tool edge temperature was measured using the two- color pyrometer with an optical fiber. In addition, the vibration caused by tool edge-work piece contact was sensed by an acceleration pickup. Experiments were performed using TiN coated HSS-spiral tap (M10×1.5). As a result, the temperature outputs from tool edges and chips were able to be distinguished. In tapping of S45C-BN at cutting speed 30 m/min, the maximum tool edge temperature is about 400 oC. The tool edge temperature was increasing with cutting aria.
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上原, 祐也 ; 細川, 晃 ; 上田, 隆司 ; 田中, 隆太郎 ; 古本, 達明
概要:
難削材旋削加工における新しい技術として、ADRT（スピニングツール）が提案された．ADRTでは工具自身が回転するため，切れ刃の加熱(切削時)-冷却(空転時)サイクルが制御でき，工具寿命の増大が期待される．しかしながら，その加工特性は明らかに
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なっていない．そこで本研究では，非接触で微小領域の温度測定が可能な光ファイバ型２色温度計を用いて，スピニングツールの加熱－冷却特性を測定し，工具への熱負荷の面から本手法の有効性を検討している． Turning characteristics of austenitic stainless steel SUS304 with an actively driven rotary lathe tool is invented from the thermal aspects. The tool temperature during one revolution of this spinning tool is measured using a newly assembled two-color pyrometer. There is an optimum tool rotational speed at which the tool temperature is at a minimum with respect to the cutting conditions.
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岡田, 将人 ; 細川, 晃 ; 田中, 隆太郎 ; 上田, 隆司
概要:
The cutting performance of some coated carbide tools in hardmilling of hardened steel is investigated. The cutting chara
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cteristics are mainly evaluated by tool wear and temperature at flank face for four types of coating films on two types of base materials. Cutting force and surface roughness are also examined. The temperature of cutting tool is measured using a two-color pyrometer with an optical fiber. The tool flank wear becomes large in the case of TiN and TiCN coated tools. The tool flank temperature increases with the increase of surface roughness of coated film, and reaches approximately 500°C for TiAlN/ AlCrN coated tool. On the other hand, the cutting forces do not change so much with surface roughness of coated film. In the case of P30-grade cemented carbide as base material, tool flank wear and flank temperature become large compared with K10- grade. The surface roughness of workpiece increases with the increase in tool flank temperature more than approximately 530°C.
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千徳, 英介 ; 上田, 隆司 ; 山田, 啓司 ; 細川, 晃
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Laser forming of a sheet metal is the bending process caused by the thermal stresses which is produced in the sheet by l
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aser irradiation. Therefore, the temperature distribution in the sheet irradiated with laser beam is one of important factors to determine the bending angle of the sheet. In this study, the influence of temperature distribution and the experimental conditions like the diameter of laser beam and the thickness of a sheet on the bending angle is investigated experimentally. The temperatures of a surface irradiated with CO2 laser and its opposite surface are measured using an infrared radiation pyrometer with an optical fiber. As a result, the bending angle is directly proportional to the temperature Ts at the sheet surface irradiated with laser beam and the beam diameter D, and inversely proportional to the thickness h of the sheet. A parameter indicated by D1.41Ts1.5/h1.7 has high correlation with the all bending angles obtained under various experimental conditions. 様々な加工条件で板材のフォーミング加工を行い, 同時にレーザ照射部表面および裏面温度を測定し, 加工条件と照射温度の変形角への影響を調べた. その結果, 変形角はレーザビーム径の1.4乗に比例し, 照射温度の1.5乗に比例し, 加工物の板厚の1.7乗に反比例しており, これらの結果より導出した式は定性的に加工条件の変形角への影響を良く表している.
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田中, 隆太郎 ; 山根, 八洲男 ; 岡田, 将人 ; 細川, 晃 ; 上田, 隆司
概要:
This paper deals with the machinability of BN added Steels in end milling. The cutting tests were carried out by end mil
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ling carbon steel JIS S45C, S55C and these BN added steels with carbide tool and TiAlN coated carbide tool. Tool wear, cutting temperature, and, surface roughness were measured and discussed. In end milling BN added steel with square end mill, the progress rate of flank wear width was decreased and fracture at corner was suppressed in comparison with that in machining standard steel. In case of ball end mill, flank wear in end milling BN added steels were smaller in comparison with standard steel. In case of S45C, boundary wear was observed, however it was not observed in end milling BN added steel. BN added showed almost the same surface roughness as standard steel. The temperature of flank wear part in turning work based S55C were 50 °C higher in comparison with S45C base work. The temperature of throw away end mill was higher 100°C in comparison with solid square end mill. There were not significant difference between the temperature in end milling standard steel and BN added steels.
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上田, 隆司 ; 山田, 啓司 ; 及川, 志郎 ; 細川, 晃
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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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山田, 啓司 ; 大礒, 桂一 ; 細川, 晃 ; 上田, 隆司
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The thermal stress cleaving of silicon wafer with a laser beam is a prospective technique, which supersedes the mechanical dicing. This method makes it possible to cut a wafer at very high production rate in comparison with the diamond thin
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blade wheel and to protect the wafer from the contamination of cutting coolant and chips. In this paper, the cleaving mechanism of silicon wafer irradiated with the pulsed Nd:YAG laser is investigated. The temperature at the area irradiated with laser is measured using two-color pyrometer with an optical fiber. The acoustic emission is also measured to examine the mechanism of the crack propagation. In the process, the temperature at the area irradiated with laser should be controlled in order to reduce the thermal damages and to improve the cleaving accuracy.
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| 9.
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細川, 晃 ; 岡田, 将人 ; 北川, 修介 ; 田中, 隆太郎 ; 上田, 隆司
概要:
The cutting performance of cBN tools for high-speed end milling of hardened steel is investigated. The cutting character
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istics are evaluated by tool temperature at the flank face, cutting force, chip geometry and surface roughness at the change of cutting speed ν and workpiece hardness. The temperature of cutting tool is measured using a two-color pyrometer with an optical fiber. The tool flank temperature θα increases with the increase of cutting speed and workpiece hardness, and reaches approximately 850°C at ν=600 m/min and HRC60. In particular, the workpiece hardness has great influence on the tool flank temperature. On the other hand, the principal cutting forces does not change so much with workpiece hardness. Based on the chip geometry measured, the most likely explanation for these phenomena is that chip formation process changes with workpiece hardness. As the workpiece hardness increases, the cutting actions become stable so that the surface roughness decreases. In the case of the low cBN content tool, tool flank temperature increases by 20∼50°C or more than high content one, because of the low thermal conductivity.
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| 10.
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細川, 晃 ; 小澤, 匡史 ; 田中, 隆太郎 ; 古本, 達明 ; 上田, 隆司
概要:
In this paper, the MQL turning of two types of ferrous metals: chromium-molybdenum steel SCM440H and pearlite malleable
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cast iron FCMP: is dealt with. The appropriate generating system of oil mist is constructed and the specified turning tool with oil hole is used. In order to verify the cooling effect of MQL, the tool temperature at the flank face is measured using a newly assembled fiber-coupled two-color pyrometer. In this new technique, a sensing fiber is inserted into a small hole that extends to the outer surface of the tubelike workpiece and it rotates with the workpiece. The thermal radiation accepted by a sensing fiber is noncontactly transmitted to the other fixed fiber and led to the two-color detectors. As for cutting force in turning of SCM440H, MQL is more effective in low cutting speed below 100 m/min. The tool temperature in MQL turning is approximately 100°C lower than that in dry turning over the wide range of 30∼300 m/min. In the case of FCMP, the tool temperature in dry turning at a cutting speed of 600 m/min reaches as much as about 1040°C, but it drops 920°C in MQL turning.
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