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49 巻, 10 号
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宮田 威男1983 年 49 巻 10 号 p. 1333-1339
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (1393K) -
被削材流動形態谷 泰弘, 長尾 高明, 竹中 規雄1983 年 49 巻 10 号 p. 1340-1344
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーModel tests of two-dimensional grinding are carried out where the work is made of clay, Plasticine and the mode of grid line deformation of work is observed. The symbols are written on the work surface before cutting in order to investigate the state of the outer and inner chip surface. These experiments give some results as follows: (1) The chip formation in grinding is discontinuous and occurred by shearing deformation that includes large slip. As the rake angle is reduced, the deformation contains squeezing under the cutting edge. (2) When the rake angle is very small, the work surface before cutting remains on that after cutting. The part of the former work surface is sucked into the work on the chip-tool interface. (3) As the rake angle increases or the cutting speed decreases, the mechanism of the work deformation comes to the formation of a continuous chip, the velocity of the chip formation drops down and the transforming area in the cutting direction is expanding.抄録全体を表示PDF形式でダウンロード (1919K) -
堀 捷樹, 日紫喜 基久, 川辺 秀昭, 上村 政雄1983 年 49 巻 10 号 p. 1345-1350
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe fatigue lives of thin bearing steel plate samples taken in three different directions to the rolling direction were compared by a new-developed bending fatigue testing machine. Observations utilizing SEM-EPMA revealed that fatigue cracks were initiated at the nonmetallic inclusions of the bearing steel. The results obtained are summarized as follows: (1) The inclusions in the vicinity of the surface acted as an initiating point of fatigue fracture in each sample judging from the observation of the directionality of equiaxed dimples. (2) The inclusions giving rise to fatigue fracture were identified for each direction. Namely, fatigue cracks in longitudinal specimens developed at square-shaped Al2O3-CaO or TiN inclusions, those in transverse specimens at linear MnS inclusions, and those in oblique specimens at complex TiNMnS, Al2O3-TiN or MnS inclusions. (3) Oxide inclusions about 5 μm in length can be the initiating point of fatigue fracture depending upon loading directions.抄録全体を表示PDF形式でダウンロード (1291K) -
塚田 忠夫, 金田 徹, 奥田 謙造1983 年 49 巻 10 号 p. 1351-1357
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe new technique to verify the minimum zone roundness was proposed by improving Nelder-Mead simplex method in consideration of the specific characteristics of cross section contour in cylinder. And the authors investigated the optimum dimension of simplex at the initial stage and reasonable convergence limit in iterative process. Furthermore the minimum zone roundness was compared with the least square roundness which has been widely applied.抄録全体を表示PDF形式でダウンロード (1124K) -
中島 利勝, 宇野 義幸, 茅原 雅之1983 年 49 巻 10 号 p. 1358-1363
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーCylindrical plunge grinding processes of titanium alloy and nickel-base superalloys with various kinds of conventional grinding wheels, which are known as difficult to grind materials, are experimentally investigated, analyzing size generation process, grinding force, surface roughness, wheel wear, grinding ratio and so on. For grinding titanium alloy Ti-6Al-4V, GC grinding wheel yields most superior grinding results which leads to lower grinding force, smaller residual stock, less wh eel wear and higher grinding ratio up to about 3 with GC 80 L 9 V wheel. Then, for grinding nickelbase superalloys Waspaloy and Rene 41, WA 150 L 9 V wheel yields better grinding results in surface roughness, wheel wear, grinding ratio without chatter vibration though grinding force is higher, and the grinding ratio about 3 is obtained. Furthermore, higher plunge speed and speed ratio result in higher grinding efficiency though grinding force, surface roughness, wheel wear increase for grinding titanium alloy and nickel-base superalloys.抄録全体を表示PDF形式でダウンロード (957K) -
電極形状の標準化と輪郭形状制御ソフトウェア今野 廣, 小室 克弘, 佐藤 真, 岸浪 建史, 斎藤 勝政1983 年 49 巻 10 号 p. 1364-1371
発行日: 1983年
公開日: 2010/01/20
ジャーナル フリーThis paper deals with a newly developed Numerically Controlled Contouring Electric Discharge Machining (NC-CEDM) system. The proposed NCCEDM is based on the shape standardization of the tool electrodes, and on the contouring control of the standard tool electrode by an automatic programming system, APSET 2, which posesses a function of multi axis numerical control. The features of this machining system are (1) reducing time to machine the tool electrode, (2) increasing the accuracy and productivity of the tool by standardization, and (3) increasing the flexibility of the shape to be removed by the newly developed contouring control programming system. In this paper, the cross sectional profile of the tool electrodes are standardized to n (1≤n≤6) polygon, the corner of which has roundness. APSET 2 has the capability of controlling the tool position and attitude (rotation on the X-Y plane) along the contour. Experimentation with standard electrodes, APSET 2, and a fouraxis (X, Y, Z, U)-controlling NC electric discharge machine have demonstrated the realization of NCCEDM.抄録全体を表示PDF形式でダウンロード (1433K) -
井戸 敏, 露嵜 晴夫1983 年 49 巻 10 号 p. 1372-1378
発行日: 1983年
公開日: 2010/01/20
ジャーナル フリーAn accurate positioning XY stage has been constructed to help assure submicron pattern generation in electron beam microfabrication. The stage is guided along journal-type hydrostatic bearings, and driven by hydraulic cylinders along X and Y axes. Characteristics of the stage mechanism and servo system are reported on in this paper. Sufficient straightness for electron beam microfabrication is realized. Vertical displacement is 0.9 μm for 80 mm × 80 mm stage travel, and yaw is 4 μrad for 140 mm along the X and Y axes. Automatic regulation of feedback gain allows stable positioning with high accuracy, and servo stiffness prevents interaction between the X and Y axes. Due to these functions, a positioning accuracy of ±0.1 μm for 2 mm and 0.5 μm travel is attained. High speed positioning is also possible due to the high responsibility of the electro-hydraulic servo and miniaturization of the stage mechanism. Positioning time is 0.1 s for 2 mm and 0. 56 s for 20 mm travel.抄録全体を表示PDF形式でダウンロード (1237K) -
アライメント誤差の影響佐久間 敬三, 田口 紘一, 甲木 昭雄1983 年 49 巻 10 号 p. 1379-1384
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe deep-hole axis deviates from the setting axis in drilling operations, and this dominant problem occurs frequently. In the present paper, the influence of pilot bush, bar support and tool holder (or spindle) on the hole deviation is investigated and the mechanism of the formation of that deviation is analysed theoretically and verified experimentally. It is made clear that the machined hole tends to deviate towards the direction of the inclination of tool head in tool rotating system. It s also obsery ed that if the pilot bush or bar support (e. g. oil seal in BTA tool) deviates from the setting axis, the bar bends, makes the tool inclined, and as a result, the machined hole runs out from the setting line. If the process goes on, the rate of deviation becomes larger. On the contrary, in workpiece rotating system, the inclination of tool head usually doesn't keep any constant direction on the co-ordinates fixed to the workpiece. So it will move nearly through the setting axis even if there is any misalignment. Therefore the magnitude of hole-deviation is smaller than that in tool rotating system.抄録全体を表示PDF形式でダウンロード (1012K) -
ホブ盤の割出性能評価に関する実験的研究(第4報)柳下 福蔵, 兼城 清1983 年 49 巻 10 号 p. 1385-1390
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーImproved materials for the hob and the advanced coating technique have created a need for testing the dynamic characteristics of dividing error between the worktable and the hob in order to attain both the high-rate and high-accuracy gear cutting. One of the authors has already developed a new apparatus for measuring the dynamic dividing error between the hob and the worktable. Using this apparatus, the dynamic dividing error was measured and recorded not only during the idle running but also during machining. In this report, seven items of testing method for the static and the dynamic torsional rigidity of the rotational transmission mechanism in a hobbing machine, which strongly affects the accuracy of the generated gear, is newly proposed by including the aforementioned method of measuring the dynamic dividing error. The seven items of testing method is carried out on a middle size precision gear hobbing machine which is one of a specific type widely employed in gear production shops. As the result, it was proved that both the high-rate and highaccuracy gear cutting condition applicable on the tested hobbing machine could be identified. The proposed testing method would also be effective for the manufacturers who use many gear hobbing machines, to examine and maintain the generating accuracy of their production equipments. The seven items of testing method proposed would be effectively applied not only to the middle size but also to the small size and the large size gear hobbing machines.抄録全体を表示PDF形式でダウンロード (1065K) -
理想的切込み曲線岡村 健二郎, 坂倉 守昭, 岡村 将光1983 年 49 巻 10 号 p. 1391-1397
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe aim of this study is to decide the ideal infeed curve in plunge grinding. In the first report, the size generation process was analyzed quantitatively. In the second report, the effect of in-feed conditions on surface roughness was discussed. Therefore, in this report, taking note of variation process of wheel surface, one of the standards of in-feed conditions is made clear from the viewpoint of wheel wear and surface roughness. Then, the shape accuracy is analyzed theoretically, based on the mathematical model of the plunge grinding which was constructed in the first report. Next, the analyzing model of the work hardened layer, which is one of the most important evaluation functions of quality, is constructed. Finally from these results, evaluation functions of grinding are adapted, that is, total grinding time, size accuracy, shape accuracy, wheel wear, surface roughness and work hardened layer, and then the ideal in-feed curve which fulfills the requirements of high accuracy, efficiency and quality is decided.抄録全体を表示PDF形式でダウンロード (991K) -
松永 和夫1983 年 49 巻 10 号 p. 1398-1403
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThis paper describes the optimum YAG laser welding conditions applied to the manufacturing of a workless on magnet print wire matrix head. The relation between the YAG laser welding conditions and metal structures is clarified. Furthermore, the effects of laser power, amount of defocus and heat treatment temperature are examined in relation to mechanical welding strength. The resulting optimum welding conditions are summarized as follows: laser power is 2.5-5 J, heat treatment temperature is 150-200°C, and the amount of defocus is ±1mm. With these conditions, a welding strength of over 100 N is obtained. The printing head weight is reduced to about 40 g and life is increased to over 107 printing times. This means that the weight is one-fifth and the life is twice that of previously reported printing heads.抄録全体を表示PDF形式でダウンロード (1399K) -
丸井 悦男, 江馬 諭, 加藤 仁1983 年 49 巻 10 号 p. 1404-1409
発行日: 1983年
公開日: 2010/01/20
ジャーナル フリーIn this paper, the sliding behavior and damping characteristic of turning tools are investigated experimentally. The relations among the sliding behavior during loading and unloading process, damping characteristic and the fixing conditionsof turning tools are clarified. Vibrating energy consumption by relative sliding between tool shank and tool rest is an essential cause of damping capability of turning tools. The complex damping capability of turning tools can be put in order by a newly-defined “energy consumption coefficient”.抄録全体を表示PDF形式でダウンロード (981K) -
研削砥石のドレッシングに関する研究(第2報)松井 正己, 庄司 克雄1983 年 49 巻 10 号 p. 1410-1415
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーSince diamond dressing is basically a fracture process of the composite wheel material, the characteristics of this material itself and the dressing force may well have some vital influences on the dressing result. An investigation has been carried out to study the effects of dressing conditions and grinding wheel's inherent properties such as grade, on the generating mechanism of cutting edges. Size distributions for dressing particles were obtained and SEM observations of the dressed surfaces were made for C to P-grade wheels. The main results obtained are summarized as follows: (1) Small particles of the order of the dressing depth accounts for a considerable percentage, in number, of dressing particles which increases with a harder wheel and with finer dressing conditions. (2) The number of diamond's passages which a grain suffers before falling off increases with a harder wheel and with finer dressing conditions, and consequently this results in an increase in area of flat plateaux on abrasive grains. (3) The number of micro-cracks on dressed surfaces of abrasive grains increases with a harder wheel and with rougher dressing conditions.抄録全体を表示PDF形式でダウンロード (1334K) -
目直し抵抗法による結合度むらの検出海野 邦昭, 東江 真一, 篠崎 襄1983 年 49 巻 10 号 p. 1416-1420
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーIn this paper, a simple detecting method of irregularity of wheel grade in dressing is discussed. The results obtained are as follows: (1) By using the processing circuit which is consist of a diode and filter circuit, it is possible to detect the irregularity of wheel grade from the acceleration output on a dresser. (2) The smaller irregularity of wheel grade is, the more direct current the processed output becomes and the larger irregularity is, the more alternating current it becomes. (3) The amplitude of the processed output is dependent upon the degree of irregularity of wheel grade and becomes large in accordance with the increase of it. (4) Using this equipment, the irregularity of wheel grade can be detected easily on a grinding machine during dressing operation.抄録全体を表示PDF形式でダウンロード (720K) -
斉藤 義夫, 久玉 敏郎, 西脇 信彦, 伊東 誼1983 年 49 巻 10 号 p. 1421-1427
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリー以上のように,流れの可視化により被削材表面における流れの状態を把握できた.この結果と壁圧や熱伝達率の分布結果を総合して,熱と流れの挙動について考察を加える.
砥石車周辺ではつれ回り流や吹出し流が生じ,多孔質性に起因する吹出し流は粒度が粗くなると増大する.これらの流れは,被削材表面では岐点(衝突点)がX=100m搬付近の衝突噴流になる.この衝突噴流は吹出し流が大きい場合,すなわち粒度が粗い場合ほど顕著になるが,このことは流れの性質から説明できる.つれ回り流は砥石車の外周面に対し接線方向の流れであるのに対して,吹出し流は遠心力に誘発される法線方向の流れである.表面にある角度で衝突するためには,接線方向の流れだけでは説明しにくく,吹出し流が衝突噴流の挙動を大きく左右すると考えられる.
ところで,衝突噴流による熱伝達率に関する研究は伝熱工学の分野で数多く行われている.それらと本実験結果を比較すると,岐点の外側で熱伝達率が極大値を示す傾向など,類似した点が認められる.このことから,粒度が粗い砥石車では局所熱伝達率がX=60mm付近で極大値を示すが,その理由は衝突噴流により熱伝達率が向上したためと思われる.
衝突噴流は,研削点を通過する後方流と砥石幅の外側に広がる側方流の三つに分岐する流れと密接に関連している.これらの流れは多孔質性に起因した砥石車周辺の流れと呼応すると考えられる.壁圧分布においてX=30mm付近で正圧を示す領域が砥石幅より広がる原因は,側方流の方向がこれに対応することから理解できる. 後方流に関しては正圧の極大値が高いことから,研削点近傍のC領域で吹出し流とは反対に空気が砥石内部に浸入し,研削点を通過した後再び吹き出す,という現象が予想される.この現象を仮定することで実験結果を無理なく説明できるが,今回の実験結果だけでこの現象の存在を証明することは困難であり,この点に関しては今後の課題と考えている.抄録全体を表示PDF形式でダウンロード (1545K) -
三好 隆志, 北村 俊幸, 村上 光平, 斎藤 勝政1983 年 49 巻 10 号 p. 1428-1434
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe purpose of this paper is to develop an automatic measuring system based on the optical Fourier transform which can be applied to the inprocess measurement of the characteristics of grinding wheel surface. The power spectrum pattern of grinding wheel surface which is observed by the optical method has some informations with respect to the characteristics of grinding wheel surface, i. e., the width of grain wear flats, the area of worn grains and the number of worn grains. In this paper, the power spectrum pattern measuring device which can estimate quantitatively and directly the characteristics of grinding wheel surface during grinding operation is introduced. And the in-process measuring system is proposed, which consists of a microcomputer, pitch control device, digital memory, rotary encoder, optical device and laser source etc. By developing the in-process power spectrum measuring system as mentioned above, the life time of grinding wheel can be determined in real time from the average width of grain wear flats and the state of grinding operation can be estimated from the distribution maps of worn grains around the grinding wheel surface printed by a teletype.抄録全体を表示PDF形式でダウンロード (1231K) -
断続切削におけるぜい性損傷に起因する工具寿命の解析柴坂 敏郎, 橋本 英文, 上田 完次, 岩田 一明1983 年 49 巻 10 号 p. 1435-1440
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーThe tool life caused by brittle failure in interrupted cutting is analyzed by the application of the fracture mechanics theory. Fatigue crack propagation characteristics which are required in the analysis are determined for cemented carbide P 20 using the single notched beam specimen in threepoint bend test. Fractographic examinations suggest that the mechanism of brittle failure in interrupted cutting is substantially similar to that in fatigue crack propagation process. The linear relationship on logarithmic scales is obtained between the rate of the fatigue crack propagation and the stress intensity factor range. The analytical results show that the tool life increases with the increase in the ratio of vertical component to horizontal component in cutting force, and also increase in the wedge angle and the rake angle of the cutting tool.抄録全体を表示PDF形式でダウンロード (1364K) -
佐藤 知正1983 年 49 巻 10 号 p. 1441-1447
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (1543K) -
岩田 一明1983 年 49 巻 10 号 p. 1448-1449
発行日: 1983年
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (288K)
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