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Volume 58, Issue 12
Displaying 1-31 of 31 articles from this issue
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Norihiko NARUTAKI1992 Volume 58 Issue 12 Pages 1949-1952
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Tetsuo NAKAI1992 Volume 58 Issue 12 Pages 1953-1956
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Haruaki KUBO1992 Volume 58 Issue 12 Pages 1957-1960
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Hirotaka KISO1992 Volume 58 Issue 12 Pages 1961-1964
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Tsuyoshi DOUTSU, Tadahiko WATANABE, Kusuhiko SAKAGAMI1992 Volume 58 Issue 12 Pages 1965-1968
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Eiichi SENTOKU1992 Volume 58 Issue 12 Pages 1969-1972
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Toshikatsu NAKAJIMA1992 Volume 58 Issue 12 Pages 1973-1976
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Tadayuki ISHIKAWA1992 Volume 58 Issue 12 Pages 1977-1980
Published: December 05, 1992
Released on J-STAGE: January 27, 2010
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Kenzou YOKOYAMA1992 Volume 58 Issue 12 Pages 1981-1984
Published: December 05, 1992
Released on J-STAGE: January 27, 2010
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Nobuo KUMAGAI1992 Volume 58 Issue 12 Pages 1985-1988
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
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Noboru KOJIMA, Iwane FUJII1992 Volume 58 Issue 12 Pages 1989-1994
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper describes a measurement system to measure fundamental characteristics under endothermic and exothermic reactions using calcium chloride (CaCl2) on chemical heat storage. In order to enable reversible chemical reaction, a measurement apparatus and method have been developed in this study. The apparatus consists of a reaction chamber and a steam chest. Measurands which become the target of the measurement are confined to temperature, vacuum pressure and mass. All measurands can be detected electrically by using a thermocouple, a differential pressure gage and a strain meter, and the automatic measurement by using a microcomputer is possible at real time. The pressure gage is independent of humidity in a measuring atmosphere. Furthermore, in mass measurement under vacuum conditions, the effect of fluctuations in temperature or pressure is removed by using the principle of parallel springs. Consequently, the measurement system is confirmed to be useful for measuring fundamental characteristics of chemical heat storage using CaCl2.View full abstractDownload PDF (907K) -
Tomoo SEKI, Shinichi TOGO, Kunihiko UNNO, Atsushi ONODERA1992 Volume 58 Issue 12 Pages 1995-2000
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIt is required to increase the stiffness of externally pressurized gas bearings. One of the simplest ways to increase the bearing stiffness is to increase the supply pressure. In the first report, authors described the test results of thrust bearings with higher supply pressure. In this report, radial bearings with slot restrictors are tested to examine the possibility and practicality of higher supply pressure. It is proved that the bearing stiffness increases almost linearly with supply pressure as predicted by the theoretical calculation. In case of high stiffness bearings with a small radial clearance, pneumatic hammer instability is not observed and gas flow rate is not a problem so critical. It is confirmed that the increase in supply pressure is the simplest and most practical way to improve the stiffness of externally pressurized gas bearings. A practical high precision spindle head is designed for using high supply pressure. The designed spindle head is expected to have 5 times of stiffness more than present ones of the same class.View full abstractDownload PDF (958K) -
Kenjiro Takai Miura1992 Volume 58 Issue 12 Pages 2001-2006
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper introduces a new type of free-form patches named rational boundary C2 Gregory patch. It can be said an extension of C2 Gregory patch developed by Miura and Wang, which gives users the capability of designing curvature-continuous surfaces (G2 continous surfaces) with reasonable flexibilities, and also that of rational boundary Gregory patch proposed by Chiyokura et al., which is surrounded by rational Bézier curves and can be interpolated with the continuity of tangent planes (G1 continuity). As the name of the patch implies, its boundary consists of rational Bézier curves. Its derivation is explained and methods for G2 continuity are proposed to connect it with a rational Bézier patch and with another RBC2G patch. Finally, a G2 continuous interpolation method based upon such patches is discussed.View full abstractDownload PDF (914K) -
Eiji MAKINO, Keiichi NOMURA, Takayuki SHIBATA, Masayuki IKEDA1992 Volume 58 Issue 12 Pages 2007-2012
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSTransparent conducting films of SnO2 were formed on Si and glass substrates from SnCl4 and O2 at low temperatures ranging from 100 to 400°C by chemical vapor deposition (CVD). Effects of ultra-violet (UV) irradiation during CVD on the microstructure and the chemical composition of formed films and on deposition rates under various process parameters, such as deposition temperature and substrate material, were studied. The SnO2 films formed at low temperatures below 300°C and at higher temperatures had amorphous and tetragonal microstructures respectively, independent of UV irradiation. At high temperatures of 200°C or above, the film formation was mainly conducted by thermal decomposition of SnCl4, and almost no contribution of direct photodecomposition was observed. On the irradiated Si substrates, films could deposit even at low temperatures below 200°C, at which the thermal CVD rates were markedly low. This was interpreted in terms of the enhancement of an oxidation reaction by active oxygen atoms which were formed by a photocatalytic reaction of Si substrates.View full abstractDownload PDF (3751K) -
Hitoshi TOKURA, Suguru NAKAYAMA, Masanori YOSHIKAWA1992 Volume 58 Issue 12 Pages 2013-2018
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper describes some cutting performances of diamond plated wire tools. 2 types of wire tools of 0.22mm in outer diameter with different diamond grain size have been used. They are 10μm grain and 35μm grain. Ceramic materials and silicone rubber are selected as difficult-to-machine materials. These wire tools are moved with reciprocating motion and their cutting performances are estimated by their accumulative cut area with the number of cycles. Also the changes of the tool and the grain are studied by SEM. Results obtained are as follows : it is hard to cut a silicon nitride ceramics comparing with alumina ceramics on account of the hard wear of the diamond grain; the cutting rate sensitively depends on the cutting load. Wire tool can cut silicone rubber as well as alumina ceramics.View full abstractDownload PDF (9058K) -
Shinya NAKAMURA, Yoshiaki KAKINO1992 Volume 58 Issue 12 Pages 2019-2024
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn this report, the effect of temperature rise of spindle bearing on the function of spindle is studied in order to solve the problem of heat generation and thermal displacement when using motor integrated spindles. In the case of constant pressure preload, axial displacement, due to rotation is analyzed. In the case of fixed position preload, preload increment was analyzed. Both cases are analyzed experimentally and theoritically.View full abstractDownload PDF (869K) -
Katsuji Tosha, Kisuke Iida1992 Volume 58 Issue 12 Pages 2025-2030
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSSeveral experiments were run to clarify the stock removal mechanism of grit blasting. Factors of the mechanism are treated on surface roughness, work-hardening, residual stress and weight of removed chip. Grit blasting was performed on commercially pure titanium (Ti : 99.4%) and carbon steel (C : 0.45%) by centrifugal blasting machine. Stock removal decreases with the increase of work-hardening and increases with the increase of the surface roughness. The mechanism of stock removal was mainly consisted of the work-hardened brittle layer. Stock removal is closely related with the machinability of the work material.View full abstractDownload PDF (933K) -
Daisuke TSUGAWA, Hirotaka YOKOUCHI1992 Volume 58 Issue 12 Pages 2031-2036
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe paper describes flow behavior simulation of polymer melt in cavities of injection molds to clarify the relationship between flow behavior and mold shapes under several injection conditions. It uses FEM ; the governing equations are Stokes equation, equation of continuity and of heat conduction. Temperature in the flowing polymer melt in a mold varies spatially and temporally during injection molding process. The former is considered in finite partitioning of the unisothermal region by means of Tridiagonalized Partition Method (Zienkiewicz, 1967), the latter in the respective FEM analysis for flow and for heat repeated alternatively by the same time increment. In comparing the results of analysis with the experiment (Short-Shot Method), the analysis shows that the simulation is useful as a prediction of melt-front shape in the process and a generating position of weld-line, but quantitatively agrees not well with the experiment in the arrival time and temperature of melt-front, because of including no generating heat inside of flowing melt.View full abstractDownload PDF (1057K) -
Development and Construction of Automatic Polishing ApparatusTetsuo SASAKI, Takashi MIYOSHI, Katsumasa SAITOH, Shinichiroh OKADA1992 Volume 58 Issue 12 Pages 2037-2043
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe purpose of this study is to develop and construct an automatic mold polishing apparatus, and verify the polishing performance for horizontal surface and multiple inclined surfaces. Up date, there are several kinds of automatic polishing apparatuses in the mold making world. However, since the behavior of these apparatuses are dependent upon their own mechanism, these polishing performances are inferior to that of expert of mold machinist. To acquire good performance of automatic polishing apparatus, this developed apparatus is designed according to the knowledge of expert of mold machinist. The two kinds of specimens, one is horizontal surface and the other is inclined, are polished experimentally by this developed apparatus, and it is verified that the performance of this developed apparatus are equal to expert's performance of mold machinist.View full abstractDownload PDF (2854K) -
A Concept of Adaptive Prediction and Application to Evaluation of Tool FailureTakashi MATSUMURA, Toshiyuki OBIKAWA, Takahiro SHIRAKASHI, Eiji USUI1992 Volume 58 Issue 12 Pages 2044-2050
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSAdaptive prediction approach is proposed for autonomous operation planning system, which can be installed on each machine tool. This approach enables us to predict machining troubles more accurately by adaptation of characteristics for analysis. This approach is applied to evaluation of tool failure in interrupted cutting. In adaptive process of tool failure, fracture probability distribution is modified by Johnson's ranking approach, which takes data of unbroken tools into account. Then fracture characteristics of tool are obtained by minimizing prediction error using conjugate direction method. In prediction process, tool failure is evaluated using updated characteristics obtained in adaptive process. Fracture characteristics finally obtained agree sufficiently with experimental result. In order to plan machining operation after adaptive prediction, neural network is constructed for rapid prediction of tool failure.View full abstractDownload PDF (1147K) -
Toshiyuki OBIKAWA, Hiroyuki SASAHARA, Eiji USUI1992 Volume 58 Issue 12 Pages 2051-2056
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSAlthough chip breaker controls chip flow effectively, how chip breaker changes cutting process and reduces chip curl radius is unpredictable quantitatively. Thus the steady state cutting by tools with chip breaker is calculated by finite element method. Namely chip formation, cutting force, temperature and stress distributions on the tool rake face, and chip curl radius, and their changes with the shape of chip breaker are obtained. When chip breaker is effective, large shear angle, small cutting force, low cutting temperature and small chip curl radius are realized in calculation as will be expected. The predicted change of chip curl radius with the shape of chip breaker sufficiently agrees with experimental results. Then the above finite element approach to chip breaker is applied to the crater wear of P20 carbide tools with chip breaker. Since wear equation of P20 tool has been obtained as a function of temperature and normal stress on the tool rake face, rate of crater wear is readily calculated. Reduction of wear rate by chip breaker in calculation is in good agreement with that in experiment.View full abstractDownload PDF (1120K) -
Study on Intelligent Automation of Grinding Process (2nd Report)Toshikatsu NAKAJIMA, Shinya TSUKAMOTO, Daisuke MURAKAMI, Katsuhiro KUR ...1992 Volume 58 Issue 12 Pages 2057-2062
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe FIAC-II System (Fuzzy Intelligent & Automatic Control II System) is developed in this report to achieve the optimum fuzzy control of grinding processes. In FIAC-II system, the infeed rates are suitably controlled to keep the normal grinding force constant in roughing process and to make accuracy, efficiency and surface roughness better in finishing process by fuzzy inprocess control. Main conclusions obtained are as follows : (1) The ideal variation of infeed rates in one grinding cycle are established in such a way as the infeed rates should be kept high in early stage without over-shoot phenomena of grinding forces and be gradually decreased to the beginning point of spark-out. (2) The higher efficiency and higher accuracy are achieved by the optimum fuzzy control of several grinding cycles in which the variation of surface rough-ness and the wheel surface condition are controlled.View full abstractDownload PDF (1346K) -
Naotake MOHRI, Hiromichi MORITA, Nagao SAITO1992 Volume 58 Issue 12 Pages 2063-2068
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIt is very important to machine micro holes with large aspect ratio on workpiece in industry. An EDM drilling device by using piezoelectric elements has been newly developed. Wire electrode with the diameter of 0.1-0.5 mm used in the machining device is directly driven without any holder. The electrode is driven with several kinds of control modes, involving gap distance control, feed control of electrode, jumping motion and vibrational motion of the electrode. By feeding the wire electrode considering the occurrence of electrode wear, it doesn't need to exchange the electrode. The removal rate is so high compared with the rate by machine tools on the market under the same machining conditions. The scale of the device is very small with the length of about 100 mm. Several micro holes can be machined very rapidly by running multiple miniature devices simultaneously.View full abstractDownload PDF (2818K) -
Follow-up speedDonglei TANG, Enyao ZHANG, Kazuhiro NOJIMA, Katsuhiko YASUDA, Kaiji SA ...1992 Volume 58 Issue 12 Pages 2069-2074
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe purpose of the study is to develop an optical non-contact displacement sensor which has the following characteristics; (1) direct measurement of rough surfaces, (2) high accuracy, (3) large measurement range, and (4) high follow-up speed. In the previous paper, a laser diode herterodyne interferometry sensor was introduced and its accuracy and measurement range were reported. This paper discusses the follow-up speed of the sensor. It is theoretically analyzed and experimentally proved that the following speed can be heightened by the increase of the modulation frequency and by the detection of a higher order harmonic component of the beat signal.View full abstractDownload PDF (921K) -
Motion Control of DD Indexing Table by Cam CurveNobuyuki FURUYA, Masatomo MATSUBARA1992 Volume 58 Issue 12 Pages 2075-2080
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn servo motor control, it is important to select suitable acceleration and deceleration curve to improve dynamic characteristics. So many kinds of motion curves have been proposed. But it is not so easy to control the motor motion by such motion curves. In this report, a new algorithm in the software servo system to generate any motion curve is proposed. In conven-tional pulse train motor control system, it is relatively easy to control the motor by any motion curve, using DDA (Digital Differential Analyzer) method, but it can not be applyed to the software servo system directly, because the system is essentially different. The proposed new algorithm can produce any motion curve, based on the cam curve motion, and less deviation which is caused by numerical integral calculation. The algorithm is the same in the function as the DDA method in conventional pulse train motor control system. The algorithm is able to be applied to multi axes robot control, but in the first report, it is applied to the motion control of 1-axis DD (Direct Drive) Indexing table and some experimental results are reported.View full abstractDownload PDF (828K) -
Static CharacteristicsShigeka YOSHIMOTO, Yoshiro ANNO, Takayuki NUKUSHINA1992 Volume 58 Issue 12 Pages 2081-2086
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper proposes a new type of aerostatic thrust bearing in order to achieve the maximum stiffness, about ten times as large as that of a conventional bearing. The proposed aerostatic bearing can operate in a bearing clearance of less than 1μm. In this bearing, the porous restrictor with 1-3 mm diameter is employed instead of a conventional feeding hole to restrict the air flow through the restrictor to a very small amount. Here, the static characteristics of the proposed bearing are investigated theoretically and experimentally. It is consequently shown that the proposed bearing is very useful for achieving a very high stiffness and miniaturizing the bearing.View full abstractDownload PDF (3112K) -
Properties of Optical Ring Image SensorTakashi MIYOSHI, Hiroshi AOKI, Katsumasa SAITO1992 Volume 58 Issue 12 Pages 2087-2092
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIn the previous report, the principle of the optical ring image sensor was analyzed by computer simulation by means of ray-tracing method. In this paper, the properties of the optical ring image sensor are experimentally measured and discussed not only for different surfaces, namely diffuse reflection surface, specular reflection surface and edge profile, but also for speckle noise which occurs in laser coherent. The results obtained are summerized as follows : (1) The radius of optical ring image is linearly proportional to the displacement of the target surface in optical axis. This result coincides with the theoretical analysis. (2) The speckle noise reduces by passing laser beam through a rotating diffuse glass plate. As a result, the measuring error reduces in steep inclined metal surface. (3) This sensor makes it possible to measure the displacement within an accuracy of ±50μm for inclined diffuse reflection surface up to ±80 degrees and also inclined specular reflection surface up to ±70 degrees by image processing of optical ring. (4) It is possible to measure the displacement in edges because the size of optical ring image is unaffected by edge profiles.View full abstractDownload PDF (4505K) -
Yoshitaka Morimoto, Takesi Yasui, Masashi Tyujyo1992 Volume 58 Issue 12 Pages 2093-2098
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe dynamic characteristics of an NC Turret Punching Press has been evaluated by using the transfer function between the input command and the resultant carriage motion measured directly. The transfer function is decomposed into two units : one is control system, the other is mechanical one. Next, a new control method for the carriage motion has been developed by using the experimental transfer function. This method is based on the idea that an input-output relation between a control command and the resultant carriage motion can be described in a linearized form constructed by the transfer function measured at a representative position of a carriage. The control input which realizes a carriage motion to move with the desired trajectory and the rapid motion has been easily calculated by our method. The experimental results showed considerable surpression of the over shoot and the vibratory motion.View full abstractDownload PDF (955K) -
Hiroyuki KOJIMA, Masahiro SESAKI, Shigeaki NAITOH, Hirokazu JINGU, Tak ...1992 Volume 58 Issue 12 Pages 2099-2104
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThis paper describes the neuro-adaptive control system of the beam structure driven by a linear DC motor. Neuro-adaptive control system consists of a weight coefficient block and a two-layer neural network. The synapse of the neuron is renewed with the feedback error of the proportional control loop of the flexural displacement of the beam structure, so that the adaptive control action is executed. From the experimental results of the neuro-adaptive control, it is confirmed that the control error between the reference signal and the flexural displacement decreases rapidly, and the inverse system of the electromechanical system consisting of the beam structure and the linear DC motor is constructed in the neural network. Furthermore, the numerical simulation by use of the finite element modeling of the beam structure has been carried out, and the numerical simulation results agree well with the experimental results.View full abstractDownload PDF (918K) -
Development of Algorithm and Its SimulationTadao TSUKADA, Yu Dahai, Hiroyuki HASHIMOTO1992 Volume 58 Issue 12 Pages 2105-2110
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSIt is demanded to measure the circulatities at many sections of a cylindrical part which is largely eccentric like a cam shaft. When a rotating table instrument is used for the measurement of circularity, the eccentric error of specimen should be removed as small as possible to ensure accuracy. In this paper, an algorithm is developed to get circularity from the data of eccentric cylinder by means of the iterative least-square method. In this study, the rotating type instrument is utilized by attaching the wide range digital probe. It is made clear that the main factor reducing the data accuracy is difference between the rotating table center and the sensing direction of digital probe.View full abstractDownload PDF (753K) -
Hirokazu SHIMODA, Fumiaki OKAMOTO, Kenichiro OHMATA1992 Volume 58 Issue 12 Pages 2111-2117
Published: December 05, 1992
Released on J-STAGE: October 08, 2009
JOURNAL FREE ACCESSThe authors propose a new type of semiactive damper to control a seismic response of a piping system. The damper is composed of a ball screw and a disk brake with piezoelectric actuators. The brake force is controlled corresponding to the seismic response of the piping or an input acceleration. The damper does not restrict the thermal expansion of the piping because its brake force does not work during a gradual movement. The seismic responses of an L-shaped piping supported with the semiactive damper are calculated using a continuous system simulation language. The restraint effects of the damper are also confirmed experimentally. The results may be summarized as follows : (1) The relative displacement response of the piping can be reduced successfully by the semiactive damper. (2) The semiactive damper has the effect of vibration suppression even by simple control methods such as on-off control and proportional control. (3) The resistance force of the semiactive damper is small compared to that of a mechanical snubber.View full abstractDownload PDF (1024K)
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