All issues
Volume 54, Issue 7
Displaying 1-30 of 30 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroshi OKUDA1988 Volume 54 Issue 7 Pages 1215-1218
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (1038K) -
Tadayoshi SHIOMI1988 Volume 54 Issue 7 Pages 1219-1222
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (746K) -
Yuko TSUYA, Seiichi ISHII1988 Volume 54 Issue 7 Pages 1223-1226
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (742K) -
Junji WATANABE1988 Volume 54 Issue 7 Pages 1227-1230
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (906K) -
Makoto KINOSHITA1988 Volume 54 Issue 7 Pages 1231-1235
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (1109K) -
Fumio NISHIGUCHI1988 Volume 54 Issue 7 Pages 1236-1239
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (612K) -
Kazuo ROKKAKU, Katutoshi NISHIDA1988 Volume 54 Issue 7 Pages 1240-1244
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (956K) -
Masahiro MIZUKANE1988 Volume 54 Issue 7 Pages 1245-1248
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (821K) -
Ryota MITAMURA, Yoshihiko YUZAWA, Fumio KAGAWA1988 Volume 54 Issue 7 Pages 1249-1252
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (752K) -
Yuichi SUZUKI1988 Volume 54 Issue 7 Pages 1259-1263
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSDownload PDF (1245K) -
Basic Concepts and Fundamental Analyses of CharacteristicsAiguo MING, Nobuyuki FURUYA, Hiroshi MAKINO1988 Volume 54 Issue 7 Pages 1265-1271
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSA new type robot called “Spherical SCARA (Spherical Selective Compliance Assembly Robot Arm) Robot” for the use of operations on a spherical plane has been developed. The robot has basically three joints (two rotational and one translational). It has the characteristic construction of “selective compliance”, that means, the compliance in the normal direction to the working sphere is small, and which in the tangent plane and for momental force are large. With this construction the robot is adaptable to assembly operations, especially for insertion. In this report basic concepts on the robot are given, and several characteristics (coordinates transformation, singularity, compliance, positioning resolution, dynamics) are discussed.View full abstractDownload PDF (1025K) -
Definition of Degrees of Freedom and Velocity AnalysisMichisuke JO, Fuyuki TORIHARA1988 Volume 54 Issue 7 Pages 1272-1278
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSA new definition of degrees of freedom of mechanisms is presented in terms of pair-loop matrices derived from pair-axis-motors and circuit matrices. A motor or a set of screw coordinates is an extended form of a vector by which instantaneous motion of a rigid body can be represented completely and uniquely. Superpositions of velocities correspond to summations of motors. The definition is valid for mechanisms with multiple closed loops and with critical forms such as pantograph. Pair-loop matrices have enough information of constraints of mechanisms to set up loop equations which determine magnitude ratios of relative velocities on all pairs. An algorithm based on pair loop equations is presented in order to simulate motion of mechanisms. Output examples of simulation program coded in APL show the effectiveness and conciseness of this algorithm.View full abstractDownload PDF (1127K) -
Munehiko YOKOGAWA, Kazuhiko YOKOGAWA1988 Volume 54 Issue 7 Pages 1279-1284
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSThe grinding performance of a CBN wheel depends largely on the way how to dress. However, no much study has been made to show unequivocal proof of the importance of dressing, partly due to lack of a proper dresser with which to do the necessary study. The authors have developed a prototype dresser capable of creating a dressed surface roughness which could enhance the high grinding performance of the CBN wheel. Another merit of the new dresser is in the ability to handle wider wheels and formed wheels as well. Addition of an air micrometer enables a quick, contactless detection of the front wheel position to be performed fully automatically. Thus, a dressing system is developed, which dresses adequately and without the need for attendance by any operator.View full abstractDownload PDF (1164K) -
Motoyoshi HASEGAWA, Yuji ISHIDA, Yoshiyuki CHIWAKI, Satoshi KAKUNAI1988 Volume 54 Issue 7 Pages 1285-1290
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper deals with the statistical analysis of the characteristics of plastic deformation to make clear the relationship between the rolling conditions and the surface roughness on the dull-finished cold rolling steel strip. The rolling experiments are carried out under a 33-factorial design of the rolling conditions which are the gap of the work rolls, the number of the rolling passes and the speed of the back-up roll. Using the cluster analysis jointly with the multiple regression analysis and the stationary stochastic process analysis, the followings become clear. The surface roughness and the mean slope of asperities are influenced by the rolling conditions in the order, the gap of the work rolls, the number of the rolling passes, the speed of the back-up roll. In the case of the same rolling condition, it can be generally considered that the valley of surface height deforms more than the peak of it. Also, the non-dimensional plasticity index is proposed to estimate the probability of plastic deformation of surface roughness under the rolling process.View full abstractDownload PDF (967K) -
Application to Belt GrindingToshiyuki OBIKAWA, Shinsaku HAGIWARA, Eiji USUI1988 Volume 54 Issue 7 Pages 1291-1297
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSVariation of shape distribution of grain edge due to edge fracture was examined from the beginning to the steady state of belt grinding as a practical example of Markov process in grinding. The grain dislodgement, which often appear in heavy belt grinding, was also investigated experimentally and it was found that the flat type edge is in the majority of the dislodged grain edges. The sequence of the edge fracture, the grain dislodgement and the edge shape transition in the incipient stage of A#24 abrasive belt grinding were then simulated with Monte Carlo method as in the previous report. The calculated results of the transition of edge shape distribution, belt wear and the percentage of effective grain were verified to be in good agreement with experimental results. It was thus confirmed that grinding processes, in which the edge fracture plays a major role, can be predicted by applying the theory of Markov process. It was further made clear that “A” type grain is preferable for the belt grinding, because even in the flat type edge it has a great probability to fracture into other types, hence sharp edges are always kept up in the grinding action.View full abstractDownload PDF (1083K) -
Toshikatsu NAKAJIMA, Yoshiyuki UNO, Takanori FUJIWARA, Atsunori IKEJIR ...1988 Volume 54 Issue 7 Pages 1298-1303
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSCylindrical plunge grinding process and surface generation process of Sialon are experimentally investigated with bronze bond diamond wheel, analyzing grinding force, surface roughness, wheel wear, ground surface and so on. Main conclusions obtained in this study are as follows : (1) In a cylindrical plunge grinding process of Sialon with bronze bond diamond wheel, there are three distinct grinding processes such as spark-in, steady and spark-out. (2) Ground surface is formed by plastic deformation as well as brittle fracture in grinding Sialon. (3) Diamond grain primarily wears in attrition. (4) Grinding force increases with an increase of setting depth of cut, while surface roughness is hardly influenced by setting depth of cut.View full abstractDownload PDF (406K) -
Osamu HORIUCHI, Takashi NISHIMOTO1988 Volume 54 Issue 7 Pages 1304-1309
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSAn active work rest with pneumatic bellows has been developed for cancelling out the grinding forces and suppressing the deflections of the workpiece together with its supporting system. Although response of the active rest is limited to a lower frequency range, it has been found adequately effective in improving the form accuracy of the ground component. It has been ascertained by grinding experiments that by using the active rest, the residual normal and tangential force components acting on the workpiece and its supports can be reduced to within ±5 N. The grinding time constant is fairly less than that with conventional setup. Cylindricity and/or roundness are considerably improved in both traverse grinding of a slender workpiece and plunge cut grinding of a workpiece with directional stiffness due to non-circular cross-sectional rod attached to both ends.View full abstractDownload PDF (352K) -
Kyoji HOMMA, Masahiro TSUKAMOTO1988 Volume 54 Issue 7 Pages 1310-1315
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe extended Hertzian analysis is investigated of elastic and elasto-plastic contact between sphere and rough surfaces. The theoretical analysis is presented using simplified rough surface models for estimating the effects on normal approach in variation of the parameters such as relatively topographical features and material constants in constitutives (sphere and flat plane with asperities). It is assumed that the asperity consists of a part of the sphere, the uniform stress is applied at the bottom of the asperity, and that horizontal displacements of each asperity are neglected. The asperities in the range of 21 × 21 squares are incrementally indented by the spheres. The normal, Gausian, distributions are applied to both heights and intervals of the asperities being on the flat plane. It was found that in elastic contact the present results, including the effects of the parameters, of the normal approach vs. load diagrams obtained here lied in between the Hertzian and the Greenwood analysis. No appreciable qualitative differences, however, should be found between elastic and elasto-plastic contacts.View full abstractDownload PDF (300K) -
Shigeo SHIMIZU, Minoru IZAWA1988 Volume 54 Issue 7 Pages 1316-1321
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe load distribution formula in the V-V ball guide in accordance with the reciprocating table movement of surface grinding machine is derived. The guiding accuracy of the table, the fluctuation of the load distribution etc. are calculated. The results are as follows. (1) Almost zero flatness of the guiding accuracy is obtained by means of 10 μm concave parabolic shape of the saddle guide ways and the load distribution becomes also parabolic. (2) Even if the pitch error between the table and the saddle V-grooves is 10 μm, the decrease of the guiding accuracy is only 0.8 μm. (3) The higher guiding accuracy is obtained by means of the decrease of the weight over the ball guide. (4) The use of regular class balls induces the decrease of the guiding accuracy due to the mutual diameter differences, but if the descending arrangement towards the center of the retainers in each row in relation to the balls size are carried out, then the guiding accuracy is improved rather than the one of the use of precision class balls.View full abstractDownload PDF (1063K) -
Regularization of Reproduced Amplitude by the Recording Current ControlTadashi MASUDA, Makoto KAJITANI1988 Volume 54 Issue 7 Pages 1322-1327
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSThis paper describes the recording method for rotary magnetic scales to regularize the reproduced amplitude. It is the method to control the recording current in proportion to the characteristic of electro-magnetic-conversion on the recording surface. The scale with the regular amplitude has been recorded by the method. By the method, combined this method to the error correction recording method described in the first paper, the scale has been transcripted of which the angle position error is an accuracy of about 0.3″ and the regulation of the reproduced amplitude is about 4%. It is confirmed that the angle position error of the scale is independent on the fluctuation of the triggerlevel and the gain in the detector.View full abstractDownload PDF (937K) -
Two Symmetric Leaf Springs with Error of DimensionYasuo YOSHIMURA, Katsumasa AMADA, Takashi AKASAKA1988 Volume 54 Issue 7 Pages 1328-1333
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSBased on the experiments, the beam theory and FEM, followings are clarified in this report. (1) The ideal point of the movement with error of dimension does not deviate from the middle point of two springs as long as two springs are symmetric regarding to y-axis passing through the middle point. Strict analysis, however, gives a small amount of deviation. (2) The error rate of displacement at the ideal point can be written as (3/2)(Δl/l0-Δt/t0), using two error rates of dimension in length and thickness, Δl/l0 and Δt/t0. This means that the error of dimension causes the error rate of displacement, or error of mass to be measured by using the movement as balance, independent of loading and measuring position s and x. There exists no error rate of displacement if the movement is adjusted so that Δl/l0 is equal to Δt/t0.View full abstractDownload PDF (989K) -
Seizo UEMATSU1988 Volume 54 Issue 7 Pages 1334-1339
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn gear generating method, the variation of angular velocity in cutting process causes involute profile error. This study deals with effect of variation of angular velocity between tool and workpiece influencing involute profile error in gear roll forming process. As the tooth profiles are finished by rolling on the uniform load, it becomes evident by experiments that angular velocity between tool and workpiece varies slightly by period of normal pitch between contacting teeth. The following results are obtained by theoretical analysis : The variation of angular velocity is based on the rolled involute profile error by itself, and the amplitude of its variation corresponds to difference of plastic deformation between the tooth of driven side and of follower side.View full abstractDownload PDF (1106K) -
Kazumasa KANEKO, Ichiro YAMADA, Kiyoshi ITAO1988 Volume 54 Issue 7 Pages 1340-1345
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSA cylindrical multi-degree-of-freedom stepping motor for linear and rotary motion is presented and the advantages of the motor are discussed. The stepping motor consists of stators for axial and angular movement and a mover. Considering the shape of the mover's teeth with respect to both axial and circumferential alignment, the magnetic reluctance of the air gap is analyzed to evaluate the maximum static thrust. Moreover, the effect of magnetic saturation is roughly estimated. Maximum static thrust for axial motion is determined to be 7.84 N and maximum static torque for angular motion is 4.9 × 10-2 N·m. Compared with commercially available linear and rotary stepping motors, the merits and demerits of the multi-degree-of- freedom motor are discussed from the viewpoint of static force, mass and input. The new cylindrical motor not only achieves high performance, but realizes a simpler, smaller, lighter mechanism since gears or linkages are not needed.View full abstractDownload PDF (980K) -
Teru HAYASHI, Hyung-gyoon KIM1988 Volume 54 Issue 7 Pages 1346-1350
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSRecently, the repetitive impact load and the noise became one of big problems in some kinds of gear train. However, the exact theoretical analysis of the problem is not achieved now. As the result of the basic study on this problem, we obtained the relationship about the amplitude of exciting displacement, the repetitive impact modes and impact energy by using the approximated analysis. The result of analysis was compared with the experimental one. The results of comparision tell that there are some difference for impact energy but good agreement for impact mode.View full abstractDownload PDF (759K) -
Kohshi NISHIDA, Katsuo FUJITSUKA1988 Volume 54 Issue 7 Pages 1351-1356
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe sound field around a finite barrier is analyzed by two- and three-dimensional boundary element methods. These results are compared with the results measured for an experimental model by a sound visualization method using three color-light-emitting diodes. In the case of two-dimensional analysis, considering the difference between the distance attenuation of the cylindrical wave caused by a line source and that of the spherical one caused by a point source, the sound pressure levels calculated are corrected to express those for the three-dimensional field approximately. For the sound field on the source side of the barrier, both of the sound pressure distributions calculated by two- and three-dimensional analyses agree fairly well with the measured ones. In the case of the opposite side to the source, the two-dimensional results are in good agreement with measured ones for lower frequencies but become inaccurate for higher frequencies. The three-dimensional results show good distribution patterns of sound pressure levels.View full abstractDownload PDF (1071K) -
Shinji SHIMIZU, Yasunori KOBAYASHI, Masayuki OKABE1988 Volume 54 Issue 7 Pages 1357-1362
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn this paper, the behaviour of the bolt head deformation in connecting is examined in detail, and the detecting method of bolt axial tension is investigated using its characteristic. And then the high accuracy and practical sensor detecting bolt axial tension is developed. The results of here are as follow : (1) By taking exactly and steadily the outer portion of the bolt head as the datum plane, the amount of the bolt head deformation can be accurately detected. (2) The amount of the deformation is in good proportion to the bolt axial tension. (3) Since the bolt head center is displaced nearly in parallel by the axial tension, the influence of the eccentricity of sensor position on the sensor sensitivity is small. (4) The detection of the axial tension is possible also in the case of the bolt marked on the top of the head. (5) The influences of the washer material, washer hole diameter and inclination of washer surface are relatively great. And in the case of standard washer, the influence of the eccentricity of the washer is small. (6) Since the influence of the temperature is small, the compensation of the temperature is no need.View full abstractDownload PDF (775K) -
The Case of an Anisotropic Thick PlateSatoru IGARASHI, Katsuhisa SHIBUKAWA, Masahiro OZAKI1988 Volume 54 Issue 7 Pages 1363-1368
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn this paper, the approximate theory for an isotropic thick plate presented in the previous paper is extended for an anisotropic plate, and general two dimensional equations in the n-th order approximation are derived for deformation of anisotropic plate with arbitrary thickness. For a graphite/epoxy composite plate under sinusoidally distributed load at the upper surface, the approximate equations presented are solved and the solution is compared with the exact one and with those of several other approximate theories by numerical calculation. The following results are obtained : (1) With increasing the order of approximation, the solution of the approximate equations approaches the exact solution. (2) The accuracy of approximate solution decreases with increasing in the strength of anisotropic property and in the thickness of the plate. (3) The limit of application of approximate equations for any given anisotropic thick plate can easily be estimated by preliminary calculation as shown in this paper.View full abstractDownload PDF (810K) -
Kunitoshi NISHIMURA1988 Volume 54 Issue 7 Pages 1369-1374
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSA small, precise and fast positioning stage is indispensable for assembly of small parts, i.e. laser transmitter modules and optical fiber connectors. Conventional stages using roller bearings or ball bearings are too massive with respect to the assembly. Stages guided by a parallel spring arrangement are fairly compact and very responsive, and can provide rapid positioning. The basic elastic linkage which is the parallel spring movement is very usefull, but has only one degree of freedom. Most assembly motions require two or three degrees of freedom. This paper deals a new one-piece compound parallel spring with two or three degrees of freedom. This spring system is realized by means of a CNC wire cut electric discharge machine and/or drilling machine from a block or plate. Design considerations and performance measurements are presented.View full abstractDownload PDF (947K) -
Yuichi OKAZAKI1988 Volume 54 Issue 7 Pages 1375-1380
Published: July 05, 1988
Released on J-STAGE: January 27, 2010
JOURNAL FREE ACCESSA micro positioning tool post, “Piezo Tool Post”, which was designed for high-resolution tool servo system of ultra-precision diamond turning machines, was developed and tested. The tool post utilizes a wire-cut parallel spring mechanism, a PZT stack and a capacitance gage to measure the displacement up to ±25 μm. To eliminate the non-linearities of PZT actuator and to improve the stiffness and response, two types of closed-loop controllers were applied to the tool post : (A) one with a notch filter ; and (B) one with state feedback using a state observer. Both controller were able to achieve a band width of several hundred Hz without resonant peaks, a resolution of <5 nm, static stiffness of >2.4 kN/μm and static stability. But it was proved that only controller (B) can improve the dynamic compliance at the resonances. The actual resolution of depth-of-cut control of <25 nm was determined by cutting tests on aluminum alloy.View full abstractDownload PDF (1086K) -
Loosening Mechanism under Transversely Repeated ForceShinji KASEI, Mitutoshi ISHIMURA, Nobutoshi OHASHI1988 Volume 54 Issue 7 Pages 1381-1386
Published: July 05, 1988
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIt is considered that the self-loosening with returning rotation of screw thread can occur in threaded joints under transversely repeated force even when the macroscopic slide is absent on the bearing surface. The above loosening can be expected to be relatively small, but should be noticed because it can become to be a start toward a serious loss of fastening force. This paper presents an approximate solution for the loosening mechanism in this case. An elastic torsion of bolt-shank produced in the relative movement between mating threads and a moment endurable on the bearing surface being regarded as basic factors of loosening, a theoretical consideration is prompted. Especially paying attention to behavior of the above elastic torsion and the loss of fastening force, an experimental examination of the theory is performed in a static condition. Consequently, it is shown that a basic appearance of loosening may be explained fairly well by the theory.View full abstractDownload PDF (1043K)
- |<
- <
- 1
- >
- >|