巻号一覧
後続誌
47 巻, 6 号
選択された号の論文の20件中1～20を表示しています
- |<
- <
- 1
- >
- >|
-
断続切削時における食いつきの研究 (第2報)中村 示, 山本 明, 河村 一郎, 森口 裕一1981 年 47 巻 6 号 p. 645-651
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, the stresses distribution upon the tool-chip contact surface at the transient cutting process of milling are analyzed by the photoelastic experimental method. The main results are as follows. That is, the distribution of normal stresses σx on a rake surface of cutter in the dry milling show a increase in a nearly beeline toward the pointed cutting edge of a cutter tooth from the chip separating point at the case of gradually increasing undeformed chip thickness, but σx show a marked increase at the neighborhood of pointed cutting edge on the case of gradually decreasing undeformed chip thickness. On the other hand, the distribution of shear stresses τxy are always nearly similarity, namely these values are gradually increasing to the middle part of tool-chip contact area from the chip separating point and have holded a constant value to the pointed cutting edge from this part after that. However, when make use of colza oil as cutting fluid, the distribution of both σx and τxy are always nearly similarity and the constant value of τxy become to comparatively small. And then, the parallel stresses of rake surface σy act always as compression stress on the tool-chip contacted face, while work as tensile stress on the free rake surface. Moreover, the tool-chip contact lengths in dry cutting are more and more increasing with the advance of cutting, these lengths, although, are nearly determined only by the undeformed chip thickness, when use of colza oil.抄録全体を表示PDF形式でダウンロード (1034K) -
長谷川 嘉雄, 花崎 伸作, 里中 忍, 難波江 周一郎1981 年 47 巻 6 号 p. 652-656
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーIt was clarified in the previous papers that the tool wear in cutting of GFRP is abrasive wear and that the tool wear is dependent on both the cutting speed and the contact length between tool and glass fiber. In this paper the effect of the tool material on the wear behavior was studied in case of the turning of GFRP-pipe with various kinds of tool material. The mechanism of the tool wear in high cutting speed (3rd zone) was also studied. The main results obtained are as follows : (1) Both transition cutting speeds from the 1st zone to 2nd zone and from the 2nd zone to 3rd zone are not peculiar to the tool material. (2) The larger the tool wear, the lower the transition cutting speeds are. (3) The work material is crushed and the glass fiber separates from the matrix, which cause the 3rd zone. (4) K-class carbide tool is suitable.抄録全体を表示PDF形式でダウンロード (1216K) -
藤本 定正1981 年 47 巻 6 号 p. 657-662
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThe distortion test which is made by bending the saw-blade tip upward is very accurate and practical, and therefore its sensitivity is studied on the basis of geometrical optics. A concentrated bending load is applied to the distorting center of the blade which is supported at the both ends. A surface of the blade in the above condition is then illuminated by a slit-light source and the images of light source formed by the surface are counted. When the blade is bent upward and in a concave position, the sensitivity increases linearly as the deflection is increased. The sensitivity takes maximum value at the optimum deflection, since the deviations of the normal direction of the surface caused by bending are larger in the neighborhood of the supporting points and smaller in and around the most deflected point. Although the width of the light sources used for the actual distortion test is not always narrow, high accuracies are obtainable, since above observations are carried out under the condition of the optimum deflection.抄録全体を表示PDF形式でダウンロード (804K) -
堤 正臣, 花栗 孝次, 伊東 誼1981 年 47 巻 6 号 p. 663-668
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーIn order to investigate the influence of the position of driving force application on the characteristics of a slideway, experiments have been done using a slide model having a parallel gib and two keep-plates, and it is mounted on a ground T-shape cross section. The starting friction force, the sliding stiffness and the attitude of a slide were investigated. It is found from the results that the sliding stiffness is largely affected by the gib setting mechanism and the driving position. And also, sliding can be started by the smaller driving force without any attitude variation if the driving position is set near the center of the main slideway.抄録全体を表示PDF形式でダウンロード (886K) -
矩形分布熱源と改良型矩形分布熱源川澄 博通, 新井 武二1981 年 47 巻 6 号 p. 669-674
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThe effect of laser heat source pattern was studied on the metal surface hardening with CO2 laser. Laser hardening is made by natural cooling due to heat conduction in the material. Difference of the laser heat source pattern have an effect on the size of hardened area or the quality of martensite. In this paper, the comparison of the rectangular source (TEMmn mode) with the modified one which is made by optical contrivance was investigated through the heat conduction theory. Calculations show that the isothermal line of modified rectangular source is deeper and wider than rectangular source to transform the austenite to the martensite. And it became clear that the modified rectangular source is more suitable for surface treatment as laser heat source.抄録全体を表示PDF形式でダウンロード (962K) -
山県 敬一, 牧之内 三郎, 難波 義治, 藤田 正道, 浦上 豊蔵1981 年 47 巻 6 号 p. 675-680
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the real-time cutter path modification in radial cam profile milling, by which the shape error due to the workpiece thermal deformation could be reduced. A cam profile is determined by the computer using the parameters indicated by a designer. And then, the temperature rise and the thermal deformation of the workpiece, during the cutting process, are roughly predicted by the finite element method previously. During actual machining process, the workpiece temperature rise, which is concerned with the variance of cutting conditions, is monitored by the minicomputer. By comparing the measured workpiece temperature with the previously predicted value, the actual thermal deformation of the workpiece is estimated. Since the minicomputer is directly connected to the numerical control unit, it generates the modified cutter path instructions and sends these instructions to the NC unit. These instructions are based on the original cam profile and the thermal deformation. It is certified through some experiments that this method improves the machining accuracy without some cooling systems. Furthermore, the minicomputer is connected to the large scale time sharing system via telephone line. Using this two level hierarchical system, computational load is shared effectively between the large scale computer and the minicomputer.抄録全体を表示PDF形式でダウンロード (1030K) -
成松 明壽1981 年 47 巻 6 号 p. 681-687
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThe magnetic scale system consisting of a strip shaped scale of magnetic substance with equally periodic recorded magnetic grating and a thin film head of nickel-cobalt ferromagnetic alloy with a pattern of folded line and using magneto-resistance effect, has been developed. The arrangement of the pattern keeps a certain phasic relation with the magnetic grating, and a bias magnetic field is applied in the direction of 0°or 45°to the element line. The structure of the magnetic scale system is such that the head surface and the magnetic grating surface are faced to each other in parallel and the head travels, along the grating keeping a constant clearance. Depending on the direction of the bias magnetic field, an approximately sinusoidal output which is equivalent to the signal of 1/2 or 1 wave length recorded is obtained. After execution of harmonic analysis of this output to find the condition to reduce distortion, clarification of the wave selectivity, evaluation of errors and experiments by trial heads, it has been theoretically and experimentally proved that this magnetic scale system can serve as a digital position readout system with sufficient accuracy and high resolution.抄録全体を表示PDF形式でダウンロード (875K) -
実験計画法に基づく研削切断特性の解析長谷川 素由, 中西 佑二1981 年 47 巻 6 号 p. 688-693
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThe characterization of the abrasive cut-off operation by the constant load system has been evaluated with the experiment of the high carbon steel, S 50 C, by the number of cut-off operations, the volume of metal removed, the cumulative grinding time, the grinding force, the cumulative volume of wheel consumed, the workpiece feed rate, the grinding ratio and the surface roughness under a 23 factorial design. It has been shown that the optimal grinding condition selected from the comprehensive viewpoint of all characteristic values is obtained by the grinding velocity (V=4800 m/min) at the high level and the length of cut (l=5 mm under the constant width 22 mm) and tha load (W=98 N) at the low level. To obtain the maximum grinding ratio, the optimal condition is realized by the grinding velocity (V=4800 m/min) and the length of cut (l=5 mm) at the high level and the load (W=98 N) at the low level. On the other hand, the best condition from the viewpoint of the workpiece feed rate is attained by the grinding velocity (V=4800 m/min) and the load (W=196 N) at the high level and the length of cut (l=5 mm) at the low level. Multiple regression equation for each characteristic values is derived at the high significance.抄録全体を表示PDF形式でダウンロード (665K) -
接触母材の塑性変形開始条件笹島 和幸, 塚田 忠夫1981 年 47 巻 6 号 p. 694-699
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis report presents an analysis of the critical load to yield the plastic deformation inside the bodies which are a sphere and a rough surface in contact. The experiments were tried by assuming that the whole plastic deformation consists of the plastic deformation of contacting asperities and the one growing inside the bodies. This critical load was calculated according to the maximum shear stress theory by using the empirical equation of normal stress distribution at contact area. It was made clear that the experimental results were well approximated by the calculated ones. Consequently the critical load is greatly influenced by the contacting asperities and increases as the surface roughness becomes large.抄録全体を表示PDF形式でダウンロード (767K) -
塩化ナトリウム水溶液中における熱間圧延軟鋼板の電解脱スケール挙動鹿田 順生, 伊東 祐光1981 年 47 巻 6 号 p. 700-705
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis study has been made as a part of studies of electrolytic descaling of iron and steel in neutral electrolyte. The removal scale on hot rolled mild steel plate can be accomplished more efficiently by anodic dissolution subsequently cathodic reduction than by the anodic dissolution only. Thus, taking notice of the fact that the cathodic reduction has a significant effect upon the scale removal and made a study in search of the method of reducing the scale layer in the shortest possible time. At least, 50% of the scale layer could be reduced in a short time of from 3 to 5 seconds when the electrolyte temperature exceeds the level of 80°C. Further, the behaviour of electrolytic descaling of the scale on hot rolled miled steel plate in NaCl solution was investigated. The scale layer after treatment of cathodic reduction are removed in the forms of ferrous ions and ferrosoferic oxide in the electrolyte. Higher temperature and lower pH of the electrolyte improve the current efficiency for the anodic dissolution of ferrosoferic oxide, as a main component of the scale.抄録全体を表示PDF形式でダウンロード (1246K) -
間欠運動の高速化に関する研究神谷 好承, 岡部 佐規一, 横山 恭男1981 年 47 巻 6 号 p. 706-711
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the motion control of a manipulator or an industrial robot arm. Generally speaking, manipulators or industrial robot arms that are constructed by the open-loop articulated kinematic chains are non-linear dynamic systems and the motion equation is described by the coupling dynamic systems between the connecting chains. So it is not easy to control a manipulator or a robot arm for positioning to the desired place at high speed. In this study, for the high speed motion of a robot arm, we tried to adapt the minimum time control to the motion of robot arm that has two articulated kinematic chains, and found the optimal path to move the robot arm from the initial configulation to the final configulation. This optimal path is very similar to the figure of which we move our own arms. And we showed the way to solve the near-minimum-time control for the multi-input and non-linear dynamic system like a robot arm that is constructed by the open-loop articulated kinematic chains.抄録全体を表示PDF形式でダウンロード (829K) -
真空中における接触熱抵抗の計算結果と実験結果の比較検討柳 和久, 塚田 忠夫1981 年 47 巻 6 号 p. 712-717
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the applicability of the theoretical analysis of thermal contact resistance studied in the previous paper through the comparison between the calculated and experimental results in a vacuum environment. SK 3, SUS 304 and C 2600 R were used as the material of contact members. The data are presented on ground surface and turned one of the same contact materials respectively. Good agreement between the measured and predicted values was obtained over a wide range of the applied load and surface roughness. Conclusions obtained may be summarized as follows : (1) The relation between the equivalent length of thermal contact resistance λm, R0 is approximated as λmR0=B1 (P/A) -B2, where B1 and B2 are constants. (2) B2 depends mainly on the ratio of material hardness pm and elastic modulus Ee. (3) B1 is nearly in proportion to surface asperity height σe. (4) Under the same contact pressure, B1 increases with an increase in pm, and this behavior becomes marked when σe is large.抄録全体を表示PDF形式でダウンロード (805K) -
垣野 義昭, 水津 弘次, 橋谷 道明, 山田 卓郎, 吉岡 肇, 藤原 彰彦1981 年 47 巻 6 号 p. 718-722
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThe in-process detecting method of the thermal crack of cutting tool has been investigated by making use of acoustic emission, which are generated during high speed interrupt cutting of steel. The following results have been obtained. (1) Specified peak of acoustic emission over 100 kHz was usually detected when thermal crack is generated on the cutting tool. (2) This specified peak of acoustic emission was detected mainly in the frequency range at 100-300 kHz. (3) The integral sum of acoustic emission voltage with time was proportional to the sum of area of thermal cracks. By making use of this relation, it is possible to estimate the amount of thermal cracks in the cutting tool.抄録全体を表示PDF形式でダウンロード (699K) -
加藤 秀雄, 中野 嘉邦, 鴻巣 健治1981 年 47 巻 6 号 p. 723-727
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes the roundnesses of drilled center holes and the vibrations of workpieces and drills during center drilling. In the experiment, center holes of workpieces are machined with center drills fixed to the tailstock of a lathe. The work-pieces are held in a three jaws chuck (method I) and held between a headstock center and a drill itself (method II). The center hole profiles and the vibrations during drilling are investigated by using Fourier analysis. The obtained results are as follows : (1) In either workpiece holding method, lower odd-number-lobed components of the profile are remarkable compared with the other components. (2) The undulation on the profile has a close relation to the vibration during drilling. (3) The mode shapes of the vibration depend upon the workpiece holding methods. (4) The profile in case of method II contains larger undulation than that in case of method I.抄録全体を表示PDF形式でダウンロード (864K) -
古川 英一, 村奈嘉 与一, 小野 義雄1981 年 47 巻 6 号 p. 728-732
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes a magnetic device which has been designed for improving the anti-shock ability and transportability of the torsional vibration pickups of long natural period. The device is in essence a variable-air-gap magnetic circuit whose armature is in the form of a soft iron disk (φ 10×1 mm) bonded onto the seismic mass and whose core is a cylindrical magnet assembly (φ 10×10 mm) attached to the pickup housing. In principle, two units of magnetic circuits are disposed in push-pull; one air-gap increases whilst the other decreases with the deflection of seismic mass. The difference of the two magnetic pulls exerted on each armature acts as a negative restoring torque, thus diminishing the torsional stiffness while retaining the rigidity of the seismic system. The performance characteristics of the device is evaluated on a torsional vibration pickup having a natural period of 0.315 s. The principle of operation and the characteristics of the device are described in detail, together with the limiting factors governing the lengthening of natural period. The most important limiting factor is the intended working temperature range of the device, and in this connection the lengthening ratio larger than 3 : 1 is difficult to achieve in practical application.抄録全体を表示PDF形式でダウンロード (863K) -
高浜 逸郎, 藤田 昌大, 佐藤 又次, 矢野 正隆1981 年 47 巻 6 号 p. 733-739
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーThis investigation aims at determining with accuracy the locomotion during the normal walking. Forces and moments at joints are obtained by an alyzing two data, the gait patterns observed by 16 mm camera and the floor reactions caught by the force plate. Though the errors are small in observations of the gait patterns, they become large in the data of the accelerations. Because accelerations are obtained by differentiating the displacement data from observations twice with respect to time, and each differentiation amplifies errors. In this report it is emphasized that the accuracies of the data of the accelerations should be evaluated by the following three viewpoints; (1) relations between inertia forces and floor reactions, (2) balances of moments at joints, (3) relations between displacements of joints and their accelerations, and is proposed a method of analyzing the data in which the data of accelerations are corrected according to the evaluated results for accuracies. The method is applied to observed data and it is found that the results become satisfactory for three viewpoints after a few repeats of correcting operations.抄録全体を表示PDF形式でダウンロード (1177K) -
白石 昌武1981 年 47 巻 6 号 p. 740-745
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (969K) -
玉邑 嘉章, 大和 淳二1981 年 47 巻 6 号 p. 746-751
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1142K) -
野呂 影勇1981 年 47 巻 6 号 p. 752-760
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1583K) -
安川 英昭1981 年 47 巻 6 号 p. 761
発行日: 1981/06/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (194K)
- |<
- <
- 1
- >
- >|