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46 巻, 3 号
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相島 鐵郎1980 年 46 巻 3 号 p. 279-285
発行日: 1980/03/05
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (1284K) -
城 道介, 秋元 芳夫1980 年 46 巻 3 号 p. 286-291
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper presents a new algorithm for generating automatically mesh of triangular elements in arbitrary planar domain. Three requirements for mesh generation, i. e., isotropic form of element, feasibility of local mesh size specification and saving on number of nodes are adopted as schemes for constructing the algorithm. A function named DTR is defined in order to evaluate the isotropy of triangular element as scalar value. DTR of equilat-eral triangle and right isosceles triangle equal to 0 and 2 respectively. Mesh generation is performed from the boundary contour toward the undivided domain increasing the element size at a specified rate of growth to decrease the number of nodes. Local standard length of inner element is deter-mined by all the size of boundary edges to harmo-nize the form with neighbouring elements. Appli-cations of the computer program based on this algorithm proved its effectiveness by output mesh patterns with average DTR value of all the ele-ments as small as 0. 5. Considerations are made on the condition of harmonized mesh generation which must be satisfied by boundary contour and input values of maximum size of element and rate of growth.抄録全体を表示PDF形式でダウンロード (901K) -
梶田 三夫, 渡辺 純二1980 年 46 巻 3 号 p. 292-297
発行日: 1980/03/05
公開日: 2010/02/16
ジャーナル フリーOxidised Si wafer is warped in convexity for oxide film side. The relation between warp amounts before and after oxidation was investigated by an-alytical and experimental method. The oxide film was assumed the same film as worked layer with compressive residual stress, and warp in thin beam Si specimen was analyzed by considering the equilibrium of dynamic moment originated from Si without stress and oxide film system in contact with each other. The results obtained are as follows. (1) The internal stress of oxide film was found to be about 25-32 kg/mm2 which was dis-tributed little larger at boundary layer than at surface layer. The inclination of this distribution does not always correspond to the Si-0 corn-posi-tion change measured by Auger analysis. (2) The warp amounts of 3 inches diameter oxidised (100) Si wafer calculated agree with experimental value within errors less than 30%. The effect of uniso-tropy on both values was little.抄録全体を表示PDF形式でダウンロード (1098K) -
υ/Vが1に比べて無視できない場合の理論解析松井 正己1980 年 46 巻 3 号 p. 298-304
発行日: 1980/03/05
公開日: 2010/02/16
ジャーナル フリーUsing a statistical method, theoretical analyses are made on grinding mechanism in the case where the workpiece surface to be ground is an ideal flat and the value of speed ratio of the workpiece to the wheel (υ/V) is not negligible as compared with the value 1. The rate of the number of effective grain cutting edges, and the probability density functions of finished surface roughness, grain depth of cut, maximum grain depth of cut, undeformed chip length and grain cutting area are calculated. And then the relations of grinding conditions to the mean value of the maximum grain depth of cut and the grain cutting area are formulated in reference to the results calculated. These theoret-ical results are compared with the results in the case of usual grinding conditions, i. e., in the case of υ/V<< 1. The same analysis is also made in the case where the workpiece surface to be ground is not an ideal flat but a coarse surface.抄録全体を表示PDF形式でダウンロード (1020K) -
杉原 和佳, 稲崎 一郎, 米津 栄1980 年 46 巻 3 号 p. 305-310
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーSelf-excited vibration in cylindrical plunge grinding caused by the regenerative effect of workpiece surface has been investigated by many researchers. But there are very few reports about cylindrical traverse grinding. In this paper, self-excited vibration in cylindrical traverse grinding caused by the workpiece regeneration is theoretically investigated and their results are compared with the experimental results. It was proved that regenerative chatter may very possibly occur under the following conditions, i.e., low traverse velocity, high workpiece velocity, wide grinding width and small depth of cut. And those results are confirmed by the experiment.抄録全体を表示PDF形式でダウンロード (792K) -
不平衡砥石による研削過程中島 利勝, 中川 平三郎, 中川 佳式1980 年 46 巻 3 号 p. 311-317
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThe geometrical accuracy in grinding is affected by various factors, and the geometrical accuracy generation process should first be made clear by ana-lyzing the grinding process under the existence of each factor in order to improve grinding geometrical accuracy. From the above mentioned point of view, the grinding process with unbalanced wheel has experimentally been analyzed to point it out that the runout is. generated on the workpiece surface by the unbalance of wheel, and that the runout generation process is significantly affected by the revolution ratio of wheel to workpiece. The effects of grinding conditions upon the amplitude of runout on the workpiece surface have then been analyzed to make it clear that the runout becomes smaller with smaller unbalance of wheel, lower plunge speed and finer dressing.抄録全体を表示PDF形式でダウンロード (1249K) -
秦 勝一郎, 樋田 並照, 矢野 宏1980 年 46 巻 3 号 p. 318-323
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThe large size of HB indentation limits a number of indenting on a standardized block to small num-ber about 10-30. Therefore it is difficult that the measurement error of HB test is estimated accurately in the comparison of measurement. This paper investigates the method for estimating the effects of each measuring conditions and the synthetic error correctly. Factors concerned with the forma-tion of indentations, i. e., indenting velocity, error of test load, duration of loading and form error of in- denter, are chosen as indicative factors in L9 orthog-onal array. Replication and two testing machines as outer factors and magnification of microscope, replication of reading and four observers as factors concerned with reading of dimension are laid out. As HB indentation can be measured repeatedly, the measurement error of diameter can be separated from the total error. It is made clear that the error of HB standard is 1.5-2.3 HB in standard deviation under the standard measuring conditions (HB10/ 3000/10) and that the effect of indenting velocity is not significant to the measurement error. For the automization of HB test, HB value has been estimated by the measurement of the depth of indentation, and then the result shows that the effect of the form error of indenter is greater than that in usual HB test by the dimension of indentation diameter.抄録全体を表示PDF形式でダウンロード (1017K) -
生産ラインにおけるバッファの研究 (第5報)岡村 健二郎, 山品 元, 浜田 和孝1980 年 46 巻 3 号 p. 324-330
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper has investigated the effects of the shape of the repair time distribution on the produc-tion rate improvement by the provision of buffers in the production line, and examined the propriety of geometric or exponential repair time distributions. The following results have been obtained : (1) The shape of the repair time distribution has no effect as to the degree to which a production line can be improved by the provision of buffers. Only the coefficient of variation is the deciding factor. (2) When marked buffer installation effects are gained, the coefficient of variation influences the production rate increment significantly. (3) The ratio of the production rate increment for the co-efficient of variation 0. 0 to the one for 1.0 lies between 1. 0 and 1.4. (4) The buffer model on which repair time is approximated by a geometric or ex-ponential distribution, is a useful tool for gaining insight into the qualitative trend of the buffer in-stallation effects, but when the production rate can be improved markedly by the provision of buffers, it requires quantitative correction of the production rate increment, associated with the value of the coefficient of variation.抄録全体を表示PDF形式でダウンロード (1036K) -
メカノケミカルポリシングの研究 (第2報)唐木 俊郎, 三宅 正二郎, 渡辺 純二1980 年 46 巻 3 号 p. 331-337
発行日: 1980/03/05
公開日: 2010/02/16
ジャーナル フリーMechano-chemical polishing characteristics of Si single crystals are studied by changing the tem-perature of polisher surface and reagent, and “apparent” activation energies of Si in polishing are obtained from Arrhenius plots of polishing rate. It is confirmed that the activation energy of work surface is apparently reduced. Mutual relation be-tween the reduction share considered as thermal energy E and frictional calorific value Q obtained from polishing forces are investigated. Results ob-tained are as follows : (1) Mechano-chemical polish-ing rate increases exponentially as the polisher surface temperature increases. Arrhenius plots of the polishing rate at each temperature agree well with the linear law. The thermal energy E increases as polishing pressure or abrasives concentration increases. (2) The functional relation between frictional calorific value Q (kcal/h) and thermal energy E (kcal/h), is expressed approximately as E=αQ-β (α, β; constant, E≥0). α in mechano-chemical polish-ing (=1/13-1/21) is 1 figure larger than that in disc type chemical polishing (=1/300) without abrasives. In each polishing condition, E is equal to zero when Q is less than 750 × 10-4 (kcal/h). (3) Increase in polishing surface temperature, that facilitates chemical reaction with a polishing reagent in mechano-chemical polishing, is due to frictional heat. The friction effect between work and abrasives on the polishing rate increase is larger than that between work and polisher.抄録全体を表示PDF形式でダウンロード (1301K) -
小泉 忠由, 伊東 誼, 益子 正巳1980 年 46 巻 3 号 p. 338-343
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes the behaviour of the tangential displacement of bolted joint under repeat-ed cyclic tangential load, putting main stress on the evaluation of damping capacity of it. The relationships between the damping characteristic and the area of the hysteresisloop given as a tangential load-displacement curve have been firstly investigated experimentally, and then the damping capacity of a bolted joint is estimated in term of equivalent loss factor. From the experimental results, it can be observed that the area of the hysteresisloop is in proportion to the nth power of vibration amplitude, and that the value of n is from 1. 8 to 2.8. From the value of n obtained here, it is possible to explain that the damping characteristic of the jointed surfaces depends on the vibration amplitude and the free damped vibration curve decays exponentially. Furthermore, the effects of loading velocity on the hysteresisloop have also been investigated under the micro-slip region by varying the velocity of tangential loading. It can be made clear that the micro-slip and the area of hysteresisloop increase with the increases of the velocity of tangential loading. In addition, it can be proved that the damping ca-pacity of a bolted joint is possible to be estimated to a certain extent by using the hysteresisloop appeared on it.抄録全体を表示PDF形式でダウンロード (741K) -
垣野 義昭, リュック・ディ チョン, 小林 昌彦1980 年 46 巻 3 号 p. 344-349
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThe in process detecting method of the cutting tool's breakage has been investigated by making use of acoustic emission. The following results have been obtained. (1) Acoustic emission was detected mainly in the frequency ranges below 100 kHz for a case of normal cutting and a case when the chips cling to the machine, while for the case of tool breakage, acoustic emission was detected mainly at 100-300 kHz. (2) By detecting the acoustic emission of higher than 100 kHz, it was possible to detect tool breakage even for interrupt cutting. (3) The amplitude of the detected acoustic emission was approximately proportional to the second order root of the surface area of the breakage. (4) The proper positions of the detector for the machine tools used in these experiments were the tool post for the lathe, the spindle head for the milling machine and the quill for the drilling machine.抄録全体を表示PDF形式でダウンロード (807K) -
S45C及び鋳鉄での実験結果谷 泰弘 , 福沢 順博, 竹中 規雄, 長尾 高明1980 年 46 巻 3 号 p. 350-354
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーA series of experiments of cutting using a single grain are conducted by the method described in 1st Report under various conditions that haven't been considered in the previous reports. Especially three kinds of cast irons are used for the work in addition to S 45 C steel. The important results are as follows : (1) The object that adheres to the diamond single grain is observed in cutting for cast iron. (2) The grinding forces for cast irons slightly bend down having the low maximums as the grinding speed increases differently from those for steel. (3) The grinding force in cutting by a sapphire single grain is about one and a half times or twice as large as that in cutting by a diamond single grain. (4) The friction angle on the rake face increases as either the rake angle or the grinding speed in-creases.抄録全体を表示PDF形式でダウンロード (713K) -
砥粒と被削材の適合性に関する研究 (第9報)松尾 哲夫, 平嶋 公洋1980 年 46 巻 3 号 p. 355-360
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThe pin-on-disc wear test has been carried out for six different grain types including diamond and silicon-nitride grits, using four hard disc ma-terials, such as hardened SUJ-2 steel, stellite, ferrite, and silicon crystal. The wear test was done under the speeds of 300 to 1200 m/min and a load of 450 g. Thus, the grain wear rate has been measured, and then, the result was discussed on the basis of the results of SEM micro-graphic observation of worn grain surface, and of the analysis of wear debris. The main results are as follows. (1) The wear rate on SUJ-2 disc was the most low at the A grain next to diamond grain, and on the other hand, the silicon nitride grit proved to have the lowest wear resistance. As the speed is increased the wear rate generally increases. (2) The wear rate on stellite disc was, in general, much higher than SUJ-2 disc. The ZS grain was the most wear resisting next to dia-mond grain, while the RA grain being the worst. (3) In the case of SUJ-2 disc, the wear debris was found to be composed of a Fe304 oxide, but no new chemical product was detected when the stellite disc was used. (4) The wear rate on fer-rite disc was more higher than the stellite disc, and the relative wear rate ranking agrees approx-imately with that on the SUJ-2 disc. The wear rate on the silicon disc was lower than the stellite disc. (5) The worn surface of the grain on both the ferrite and the silicon were much more smooth than other two metallic discs. It is thought for the grain wear mechanism on these two ceramic disc materials that the abrasion of very fine wear debris, which may be composed of the powder of disc material, plays an important role on the progress of wear.抄録全体を表示PDF形式でダウンロード (1824K) -
中野 嘉邦, 鴻巣 健治, 加藤 秀雄, 末田 章1980 年 46 巻 3 号 p. 361-366
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーA new method is presented in which the milling cutter contours for helicoidal workpieces having arbitrary contours are numerically determined without solving transcendental equations as usual. It is obvious that when a helicoidal workpiece is actually milled, the finished workpiece profile on the cross section is given as the deepest boundary contour, namely, the envelope for the family of the curves which are produced by the cutting edge of the cutter at various positions and have been moved to the reference cross section by the screw motion. On the other hand, it is also obvious that the milling cutter profile for a given workpiece can be obtained in the same way by supposing that the cutter is to be machined with the workpiece. The proposed new method is based on this simple principle and the cutter contour is determined by iterating the succesive approximation until the enve-lope converges to a certain range depending on the desired accuracy. In addition, a method is described by which the correctness of the design can be examined, that is to say, by which the workpiece contour to be generated by the given cutter is determined. Since many difficulties due to transcendental equations are avoided by using this method, the design of milling cutters for helicoidal workpieces will be accomplished easily. Especially, the aspect of the interference during machining can be examined without difficulty.抄録全体を表示PDF形式でダウンロード (790K) -
数値解析の手法下河辺 明, 豊山 晃, 我妻 雄策1980 年 46 巻 3 号 p. 367-372
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーThis report introduces a numerical method for calculating the tooth bearing and the angle trans-mission accuracy in worm gears. In this method, the tooth surface of the worm wheel is represented by the set of points on lines of contact between the basic helicoid of the hob and the worm wheel surface. Taking account of the case where edge contact occurs, the worm wheel surface is limited by contour lines of the worm wheel. The clearance between the surface of worm wheel and that of worm is defined to be measured along the circumference of the wheel. By using the clearance, the tooth bearing and the angle transmission accuracy are calculated. The experimental measuring device is also introduced. On this device, worm gears can be placed according to the mounting dimensions, which can be varied to cause intentional errors of the center distance, the axial position of wheel and the shaft angle. As an example, the tooth modified worm gears, the worm of which is finish-ground, is taken. It is shown that the calculated results agree with the experimental ones.抄録全体を表示PDF形式でダウンロード (883K) -
小林 豊治1980 年 46 巻 3 号 p. 373-378
発行日: 1980/03/05
公開日: 2009/06/30
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吉本 勇1980 年 46 巻 3 号 p. 379-383
発行日: 1980/03/05
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (763K) -
上野 滋1980 年 46 巻 3 号 p. 384-385
発行日: 1980/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (430K)
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