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菊地 勝昭
1986 年 52 巻 480 号 p.
2039-2043
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
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末岡 淳男, 近藤 孝広, 田村 英之, 古川 知良
1986 年 52 巻 480 号 p.
2044-2052
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This paper describes the analytical results of the nonlinear subharmonic and parametric combination resonance of a roller chain stretched vertically, which is regarded as a system with many degrees of freedom, when the elongation of the chain during vibration is taken into account. The resonance treated in this report is one of the resonances excited by combined forcing and parametric excitations in which the ratio of the frequency of the forced lateral displacement acting at a lower end to that of the tension fluctuation is 3 : 2. The vibration characteristics are computed for the chains with different frictional coefficients and are compared with the forced ones without parametric excitation. The remarkable features attributable to the combined excitations and the changes of the characteristics with friction and with degree of freedom are shown in the figures.
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末岡 淳男, 近藤 孝広, 田村 英之, 古川 知良
1986 年 52 巻 480 号 p.
2053-2060
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This paper reports on a comparison of the experimental and the analytical results of the 1/3-harmonic and parametric combination resonance in a chain system, treated in a previous report. First, the frictional characteristics of the 1/3-harmonic vibration without parametric excitation are investigated experimentally and analytically, and a representative frictional coefficient is determined. Then, the influences of a phases angle between the forced displacement and the prescribed tension fluctuation, and the level of the tension fluctuation upon the 1/3-harmonic and parametric combination resonance are examined using a chain with comparatively large friction. The characteristics of the combination resonances and the 1/3-harmonic vibration are also compared with each other. A fine agreement between experimental and analytical results was confirmed.
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小沢田 正, 鈴木 勝義, 高橋 伸
1986 年 52 巻 480 号 p.
2061-2067
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
An exact method using power series expansions is presented for solving asymmetric free vibration problems for shells of revolution having meridionally varying curvature. The governing equations of motion and the boundary conditions are derived from the stationary conditions of the Lagrangian of the shells of revolution. The method is demonstrated for shells of revolution having elliptical, cycloidal, parabolical, catenary and hyperbolical meridional curvature. The natural frequencies and the mode shapes are numerically calculated.
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山口 秀谷
1986 年 52 巻 480 号 p.
2068-2075
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In this paper, free vibration of the cantilever rectangular plate with slit is investigated by using an extended Rayleigh-Ritz method. To apply the method, the plate is considered as an assemblage of several rectangular plates. The plate displacement is presented for each element rectangular plate by interpolation functions corresponding to unknown displacements and slopes at the discrete points which are chosen along the edges, and series of functions which satisfy homogeneous artificial boundary condition. By inserting the boundary conditions in the equations which are given by minimizing the energy functional corresponding to the assumed displacement function, the frequency equation is obtained. In the numerical example, natural frequencies and mode shapes are presented for various aspect ratios of the plate and slit.
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丹羽 博志, 相田 安彦, 佐々木 陽一, 大手 敏, 松永 隆志, 巻口 守男, 仲平 四郎, 笠井 洋昭
1986 年 52 巻 480 号 p.
2076-2083
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
It is important to design vertical pumps considering seismic responses in addition to rotor vibrations due to unbalances. This paper presents analytical and experimental studies to evaluate seismic responses on vertical pumps. In the experiment, a small vertical pump was tested to obtain its vibration characteristics during earthquakes. In the analysis, the seismic responses on the vertical pump were obtained using a one dimensional beam model under several assumptions. Especially, the method using linear impulse response is proposed to calculate the bearing loads due to collisions between the outer and inner casings during earthquakes. Numerical calculations using the above mentioned method were carried out. the analytical results coincide well with the test results.
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小柳 志郎
1986 年 52 巻 480 号 p.
2084-2089
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Though the variable orifice air spring with linear orifice flow characteristics has been developed and tried in practice in the JNR, it still has nonlinearities attributed to state equations of air. Taking nonlinearities held in the air spring into consideration, comparative studies on the responses of both conventional and variable orifice air springs to vertical and roll excitations are made in this paper. Evaluation form the view-point of vertical and roll quality of railway vehicles shows that the variable orifice air spring has superior vibration isolation characteristics in both fields, especially in roll isolation, to the conventional air spring.
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田中 信雄, 菊島 義弘
1986 年 52 巻 480 号 p.
2090-2098
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This paper presents a new active vibration control method-a pole-zero active vibration control method which makes it possible to enhance the capability of controlling the vibration. The new method constructed by a feedforward-feeback control possesses two kinds of functions : one to control the input to the system, resulting in adding zeros to the system ; and the other to lower the sensitivity of the input to the output by changing the pole configurations of the system. First, this paper shows the relation between a feedforward-feedback control and the pole-zero active vibration control. Then, applying the active vibration control method to a system subject to an impact force, a systematic design procedure of the control system with the feedforward-feedback control is shown. Next, based upon the design procedure, an optimum design of the vibrationless forge system is achieved. Finally, the characteristics of the control system are discussed.
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呉 在應
1986 年 52 巻 480 号 p.
2099-2105
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This paper presents a new method for noise source identification in a multiple noise source environment, where the noise sources may be coherent with each other. It is found, by multi-dimensional spectral analysis, that the major characteristic portion of the noise source is generated by the vibration of the press machine. This analysis is modeled as a multiple input/single output system when the noise generating system of a press machine is very complicated. In this analysis, the concepts of residual spectral analysis and partial coherence function are applied. The relationships between noise sources and radiated sound pressure are computed by micre-computer system. Finally, overall levels for radiated sound pressure obtained by multi-dimensional spectral analysis are compared with those measured.
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荒木 嘉昭, 横道 勲, 陣内 靖介
1986 年 52 巻 480 号 p.
2106-2112
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
A new type of impact damper consists of a bed of granular materials moving in a container fixed to a primary vibrating system. The problem is to determine the characteristics of the impact damper with granular materials for reducing the vibration of a single degree-of-freedom system when the driving force is simple harmonic. This report deals with the case when the damper is applied to a horizontal vibrating system. Experimental models were tested in the laboratory and theoretical analyses were developed to find the periodic solution s of the impact osicillations of a mass in the container, assuming that the coefficient of restitution R=0. The corrective mass ratios and clearances were found to fit the theoretical responses to those of experimentally obtained.
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前沢 孝一, 田中 直行, 能上 允男, 中村 庸藏, 松永 銕造
1986 年 52 巻 480 号 p.
2113-2120
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Since the point or line of contact of helical gears runs along a tooth trace during rotation, the tooth root strain distribution along a tooth trace should make a periodic change when a dynamic load is applied. In this study eighteen strain gages, stuck in the region to cover more then one axial pitch, were used to measure the change of tooth root strain distribution precisely. The results showed that the integral of the tooth root strain with respect to length along a tooth trace made a periodic change during rotation, and its amplitude increased in resonance regions.
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漆原 煕
1986 年 52 巻 480 号 p.
2121-2127
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This 3rd report deals with the 4-dimensional space-time representation of rationalized Newtonian developed in the previous two reports in 3-dimensional space form. By using 4-dimensional form, the geometrical vectors of velocity, acceleration and force become invariants under any coordinate transformations. This invariance leads to the equation of motion of a material particle without any inertia force terms in an arbitrary curvilinear moving coordinate system. The inertia force terms in 3-dimensional representation are found to be derived form the coefficients of connection in the time direction in 4-dimensional representation. The law of action and reaction also holds good in 4-dimensional form.
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伊藤 雅則, 志村 和紀
1986 年 52 巻 480 号 p.
2128-2134
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
An electric fuel injection system is thought to be one of the most effective methods for improving thermal efficiency of the marine diesel engine. Nippon Kokan K.K. have developed a new type of fuel injection system, which uses a hydraulic servo-mechanism and injection control system, based on an optimal control algorithm for a higher speed engine. The performance of these systems examined on the test engine showed higher controllability and a large amount of reduction of fuel oil consumption. The control algorithm was established as being applicable to the practical system with no problems.
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谷 豊文, 矢部 寛, 標 博雄, 三輪 博
1986 年 52 巻 480 号 p.
2135-2141
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The fluid film thickness between a magnetic tape and a rotating drum is studied experimentally using a laser measuring system under conditions where the fluid film thickness is affected by the bending stiffness of the tape. For comparatively flexible tape cases, the experimental results coincide fairly well with theoretical ones obtained by applying the separation boundary condition. For cases with stiffer tape conditions, the tendency of the experimental results may also be explained well by the theoretical analysis, by introducing the concept of the tangency point condition as well as the infinity point condition for the film pressure generation point.
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小野 京右, 土谷 幸広, 伊庭 剛二
1986 年 52 巻 480 号 p.
2142-2149
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The static and dynamic characteristics of a circumferentially grooved hydrostatic gas thrust bearing are numerically analyzed and an optimum design method is proposed for a high pressure region. For a supply pressure of less than 0.4 MPa (absolute), bearing parameters which maximize angular stiffness should be chosen, because the bearing can have positive damping. For a supply pressure of more than 0.4 MPa, the stabilized design in the groove compensated operating region with a feeding parameter high enough to make the parallel motion damping positive is recommended. Two design examples are shown for both large and small thrust bearings. The experimental results showed a fairly good agreement with the calculated ones, except for one datum regarding the instability threshold.
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島地 重幸, 酒井 高男, 長瀬 亮
1986 年 52 巻 480 号 p.
2150-2155
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In some cases of bevel gear services, the most important demands of them are the cost and the speed of the gear production. This paper proposes a new simplified cutting method. In the method, both the face-milling cutter and the bevel gear work rotate at a high speed and the cutter is fed only in the direction of the tooth depth. This cutting method gives the spiral bevel gears the tooth surfaces, which are ruled by the cutter edge and are eased off on the tip and the bottom of tooth profile, and which contact almost exactly along the tooth trace. The relation of the shape of the cutter edge and the tooth gap of the mating tooth surfaces is investigated theoretically. Plastic bevel gears are cut trially. With these trials, it was assured that the cutting method is available.
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島地 重幸, 酒井 高男, 長瀬 亮
1986 年 52 巻 480 号 p.
2156-2159
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In the previous report the authors proposed a new simple method of bevel gear cutting. In the method, the cutter and the gear work are set and driven in a basic simple manner. The tooth surface of the gear is eased off on its tip and root and has the narrow bearing zone along the tooth trace on it. This paper investigates two methods that give some crowning along the tooth trace. In the first method, the cutter blade traverses along the bottom of the tapered tooth space and cuts simultaneously the both side surface of the tooth space. In the second method, the cutter axis is set with an angle to the crown gear axis and the cutter blade is fed a little deeper at both inside and outside of the bevel gear teeth. The investigation shows that the latter method gives a simple estimation of the magunitude of the tooth crowning and an easy setting of the cutter.
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有浦 泰常, 丘 華, 梅崎 洋二
1986 年 52 巻 480 号 p.
2160-2166
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Accurate gears are needed in order to obtain the high load carring capacity of gears. This study aims at manufacturing highly accurate gears by hobbing. In this report, a method for the calculation of tooth profile errors caused by geometrical hob errors such as profile errors of the hob tooth and the eccentricity of the hob is proposed. From the comparison of the calculated tooth profile errors with the measured ones in hobbing tests, it is found that the tooth profile errors generated by the geometrical errors and the eccentricity of the hob can be distinguished from those by the dynamic errors of the hobbing process, i.e. vibrations, built-up edges and so on. It is proved that the accuracy of this calculation method is sufficient to study the accuracy of hobbed gears.
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梅崎 洋二, 有浦 泰常, 丘 華
1986 年 52 巻 480 号 p.
2167-2173
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The causes of tooth profile errors in gear hobbing are investigated by comparing the computed tooth profile errors with the measured ones, for manufacturing accurate gears. Under various hobbing conditions, gears are cut and measured. Spheroidal graphite cast iron is used as hobbed test material because built-up edge hardly occurs. From these comparisons, it is found that the tooth profile errors are mainly caused by the geometrical errors and the eccentricity of the hob. The tooth profile errors caused by the dynamic errors of the hobbing process are very small under these conditions, though they are observed more or less in the case of helical gear hobbing. It is also confirmed that the calculating method of tooth profile error, which is reported in the 1st report, is useful in analyzing gear accuracy.
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小幡 文雄, 藤田 公明, 藤井 正浩
1986 年 52 巻 480 号 p.
2174-2180
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The bulk temperature rise was studied when a moving heat source with variable heat quantity was supplied repeatedly at regular intervals on the surface of an isotropic and homegeneous rectangular shaped body used as a model of a spur gear tooth. The effect of radiation at the inner surface of a boss on the bulk temperature rise reduces as the distance between the inner surface of the boss and the working flank is increased. The bulk temperature rise is almost inversely proportional to the interval of the heat supply. The size of the heat supply region and the moving direction of the heat source scarcely affect the bulk temperature rise. In |v^
-| not less than 1000, the bulk temperature rise is not affected by the moving velocity of the heat source, and the approximate bulk temperature rise can be obtained by dividing the temperature rise on the working flank due to the stationary heat source by the number of teeth.
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藤尾 博重, 高橋 元洋, 湯塩 晴久
1986 年 52 巻 480 号 p.
2181-2186
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Some helical gears, which were made of three low alloyed steels and had different numbers of teeth, were through-hardened to investigate how hardenability affects gear distortions caused by hardening. From the experimental results, the hardenability of gear material influences changes of the tip cylinder diameter. Also, the helix angle is apt to decrease through the heat treatment, and the extent of its change is related to the hardenability and helix angle. Furthermore, because the face width of the test gears had an effect on gear distortions, the Jominy test was carried out and the equation of the temperature in the quenching process of solid cylinders, which were substituted for the test gears, was induced theoretically. And it is shown from the relation between the maximum cooling rate and the volume fraction of martensite that the difference of the region occupied with martensite is related with the hardenability of the material, and that the thickness of the hardened layer gives different gear distortions.
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新井 典久, 青山 栄一, 原田 進, 岡本 宗治, 鳥谷尾 哲也
1986 年 52 巻 480 号 p.
2187-2193
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The present experiment has been carried out for the purpose of analyzing (by F. E. M.) in detail, stresses (displacement) at the circumference of the fitting surface, and stresses at the root fillet of the tooth of a force-fitted spur gear, in consideration of the elastic contact condition of the two parts (gear rim and shaft) and the shrinkage of the fitting shaft diameter. Moreover, from these analytical results, the practical formula of internal pressure at the fitting surface was discussed.
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小田 哲, 宮近 幸逸
1986 年 52 巻 480 号 p.
2194-2199
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
This paper presents a study on the root stress of a thin-rimmed internal spur gear supported with pins. Root stress analyses by the 2-dimensional finite element method (FEM) for internal spur gears of various rim thicknesses supported with pins were carried out. The effects of boundary constraints for gear models on the root stresses and the deformation of rim part are discussed, and the relations between the root stresses, the deformation of rim part and the position of loaded teeth are indicated. The effects of the number of pins and rim thickness on the root stresses are clarified to a considerable extent.
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日高 照晃, 杉本 信行, 石田 武
1986 年 52 巻 480 号 p.
2200-2206
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Equations of the equilibrium of statical forces acting on elements of planetary gear drive are deduced. Then using the equations, effects on the load equalizing mechanism, run-out and attachment errors of elements and the number of planet gears on load distribution rates of planet gears are obtained, with the following conclusions : In the case of three planet gears, one element among a sun gear, an internal gear and a planet carrier should be movable. Whereas in cases where the number of planet gears is more than four, the planet gears should be movable. Each direction of the run-out error of the planet gear at the initial state should be in the radial direction to the center of the planet carrier. The circumferential position of the planet gear shaft as well as radial one should be composed with special care.
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日高 照晃, 笹原 政勝, 谷岡 良弘, 岡田 幸士
1986 年 52 巻 480 号 p.
2207-2212
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Wave gears are widely used in order to drive the rotating parts of an industrial robot and many industrial units because it is coaxial and has a large speed ratio. However a torsional vibration in the robot, which occurrs owing to the wave gears at a certain number of revolutions, becomes a problem for the robot which has to move a driven part with high accuracy. Therefore the effects of the accuracy of components and assembly errors of the wave gears on the torsional vibration of the robot are made clear experimentally.
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寺内 喜男, 永村 和照, 野原 稔
1986 年 52 巻 480 号 p.
2213-2220
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The rippling failure occuring on rollers and gears is well known as one of the phenomena resulting from the plastic flow of the surface layer which is caused by repeated sliding-rolling contacts. Though a few experimental results on the rippling failure have been already reported, there have been few studies explaining systematically the generating mechanism of the rippling. In the present paper, the rippling failure for the case-hardend gear was investigated under slow speed and heavy load operations by using a power-circulating type gear testing machine and by changing the rotating gear speed. The experimental results clarified the form and the progress of the rippling failure occuring on the gear tooth surface.
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寺内 喜男, 白石 光信, 高原 真
1986 年 52 巻 480 号 p.
2221-2227
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
To obtained a tooth profile with high accuracy in the rolling finish of gears, the authors proposed a rolling finish of gears by using a variable rolling force, and then clarified the availability of that method by experiments reported in the previous papers. In the present paper, the factors which affect the deformation of the tooth surface are studied by using many pairs of gears, and the changing position of the rolling force is discussed according to those factors. The position should be decided by consideration of the variation of the normal tooth load due to the frictional force and the distance of the loading zone. The more suitable changing positions of the rolling force giving the desirable tooth profile without indentation exist for the driven and followed sides respectively.
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荒井 淳二, 中原 綱光
1986 年 52 巻 480 号 p.
2228-2235
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The force characteristics between two opposed magnetic poles with a finite dimensional groove have been numerically calculated using mapping unknown quantities contained in the mapping function have been determined by use of successive substitution for the force and stiffness decreased monotonously with an increase in the width and depth of the groove for a gap distance greater than 40 percent of the pole length, though a general magnetic pole-piece is grooved on its end surface for the achievement of higher restoring force and stiffness. The optimum width and depth of the groove, which give the highest load capacity and stiffness, were found to occur when the gap distance is less than 30 percent of the pole length.
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山中 和行, 角張 毅, 山田 昭夫, 狩野 正樹
1986 年 52 巻 480 号 p.
2236-2241
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
When an impulse force is given to a fixed element, the logarithmic decrement and the natural frequency of the fixed element depend on the amplitude of vibration. From the logarithmic decrement and the natural frequency obtained from this method, stiffness and energy loss of the fixed element are calculated. The stiffness and energy loss are compared with those obtained statically. Static stiffness and energy loss of the fixed element are obtained from the hysteresis loop which occurs when applying an oscillating tangential load statically to the fixed element. It is consequently found that the relation of stiffness or energy loss obtained dynamically versus the amplitude of the oscillating tangential load is qualitatively in good agreement with that obtained statically.
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下嶋 浩, 山本 耕太郎, 川北 貢造
1986 年 52 巻 480 号 p.
2242-2248
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Number and dimensional syntheses of a gripper with one input and three degrees of mobility have been presented in the former paper, by considering the action forces and transmissibilities. In this paper, the grasping characteristics of such a gripper are analyzed theoretically and the results are confirmed experimentally. The graspable size of a circular cylinder with the use of this gripper is obtained and is compared numerically to that with the use of a conventional parallel-two-finger type gripper. Moreover, characteristics such as shapes, sizes, and masses of the bodies are obtained with respect to a circular cylinder, regular square prism, and hexagonal prism.
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沢 俊行, 諸星 常志, 清水 章弘, 山本 京一
1986 年 52 巻 480 号 p.
2249-2256
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In designing bolted joints, it is important to examine the clamping effect (the distribution of contact stress) and to estimate the force ratio (the ratio of an increment of bolt axial force to an external load). The clamping force of bolts and the external bending moment are axi-asymmetrical loads, and no investigations treated as axi-asymmetrical loads are made either except some ones reported. In this paper, the clamping effect and the force ratio in the case where clamped parts are circular flanges subjected to external bending moments are analyzed as axi-asymmetrical problems using a three-dimensional theory of elasticity. For verification, experiments are carried out with respect to the distribution of contact stress and the force ratio for the external bending moment (relationship between an increment of bolt axial force to an external bending moment). Analytical results are in a fairly good agreement with experimental ones.
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井関 日出男, 室田 忠雄, 加藤 和典
1986 年 52 巻 480 号 p.
2257-2264
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
A determination method for the limiting redrawing ratios and the number of operations has been proposed by analyzing the redrawing process of cylindrical shells from flat circular blanks by the use of the elementary theory of plasticity. The limiting redrawing ratios were calculated using the fracture criterion based on the plastic instability under the plane strain tension of the cup wall. Theoretical results on the variations of the redrawing ratios with the profile radius, the blank thickness, the frictional force, the blankholder load and the strain-hardening exponent were presented using a developed computer program aimed at rationalizing, planning and simulating the redrawing process. It was shown that the present method of determining the redrawing ratios was effective, by comparing the predicted values with the usual recommended values based on the experience of many years of skilled labour.
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河合 望, 森 敏彦, 劉 玉理
1986 年 52 巻 480 号 p.
2265-2271
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Using the precipitation-hardening aluminum alloy sheet A 2024, it has been clarified that both the improvements of press-formability and strengthening can by satisfied simultaneously by means of thermomechanical treatment (TMT). The stress-strain curves of TMT. I where deformation or forming is followed by aging, i.e., the combined curves of strain and age hardening were gained by the uniaxial and balanced biaxial tension tests. Furthermore, the combined hardening curves could be expressed by H
v=H
v (strain, aging temperature, aging time), for various aging conditions. In the case of the deep-drawing by a flat-headed punch followed by aging i.e. TMT. I, the aging of 210°C×10/60min is most preferable. The combined hardening distribution H
v (X, Y, Z, aging condition) of the drawn cup could be estimated by using simultaneously the above stated H
v (strain, aging condition) and the equivalent strain distribution measured or calculated from the formed cup.
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黒崎 靖, 藤城 郁哉, 坂 鉱一, 岡本 淳
1986 年 52 巻 480 号 p.
2272-2277
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The recent development of electronics industries requires a piercing technique for fine holes with a high production rate. The present research attempts to apply to such piercing a new manufacturing process utilizing the impact compression of a viscoplastic pressure medium, recently proposed by the authors. As a result, the process has succeeded in making various fine holes, unobtainable by the conventional shearing process : for example, circular holes with a 0.05 ∼0.1 mm order in diameter and a slit of 0.05 mm in width. The piercing pressure is examined theoretically and experimentally.
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太田 博, 水谷 一樹, 川合 忠雄
1986 年 52 巻 480 号 p.
2278-2286
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
Cutting forces and deflections of a workpiece are measured from the start of cutting operations and one of the important physical causes of regenerative chatter is found to be a small change of the cutting force that necessarily exists, even in a stable cutting condition. In a stable cutting condition the workpiece is slightly disturbed by a hammer blow, and the changes of the cutting forces and the workpiece deflections are simultaneously measured. Vibratory parameters of a workpiece, that is, spring constant, damping coefficient and so on are precisely measured, and more suitable equations of motion for chatter vibration are proposed. These proposed differential equations of motion are calculated by a digital computer for two initial conditions ; that is, first, the workpiece suffers a small disturbance of displacement ; second, the workpiece is disturbed by a hammer blow. Results of numerical calculations are compared with experimental results, and quantitative coincidence is derived.
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小尾 誠, 小林 隆志
1986 年 52 巻 480 号 p.
2287-2293
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In the present paper a semi-infinite wedge loaded along the face has been theoretically reduced by the theory of elasticity to estimate the stress distributions in the cutting area. The analysis is preformed using Airy's stress function s combined of the known harmonic and biharmonic functions in which the stress components are transformed into expornential functions. This problem is reduced to obtain a solution which satisfies the boundary conditions with only two drived series functions. The calculation results obtained are as follows : The stress distributions of a 45 degree wedge loaded normal stress along the face are different from are of the semi-infinite plate. The principle shear stress plane causes in the plane inclined by 45 degrees in the work. And chippings occur easily in the tip of the tool.
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鍵和田 忠男, 金内 忠彦
1986 年 52 巻 480 号 p.
2294-2300
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
The thermal expansion and wear of the grinding wheel are measured during, cylindrical grinding by a new experimental method named the ""Radial difference comparison method"". In this method, two grinding wheels are set together in flanges. The radial difference of the two wheels is measured by means of the blade method, and the thermal expansion and wear are obtained. In this paper, as the 2nd report, the comparison process is automated by use of a new pattern recognition method named the ""United points discernment method"". By using this method, the processing time expended in the comparison process is shortened in almost 1/4 of this value in the case of manual processing.
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濱田 年男
1986 年 52 巻 480 号 p.
2301-2308
発行日: 1986/08/25
公開日: 2008/02/21
ジャーナル
フリー
In some kind of production system, the raw materials are converted to semi-finished products and then they are assembled to the finished products. In this process, the state of material or semi-finished or finished product at each instant of time is considered as one of the four ; being processed by one machine, being assembled by another one, being transferred from one place to another and being held as a stock. By representing these kinds of states of the jobs by orthonormal vectors in a vector space, an analyzing method is constructed. A production logistics planning matrix is defined in this case and its several properties are derived. Furthermore, a procedure to obtain the optimal production logistics planning matrix is constructed with the criterion in which the sum of one kind of idle time of all the machines is minimized.
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