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Volume 52, Issue 8
Displaying 1-30 of 30 articles from this issue
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[in Japanese]1986 Volume 52 Issue 8 Pages 1283-1284
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1285-1288
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1289-1291
Published: August 05, 1986
Released on J-STAGE: February 16, 2010
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[in Japanese]1986 Volume 52 Issue 8 Pages 1292-1295
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1986 Volume 52 Issue 8 Pages 1296-1299
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1986 Volume 52 Issue 8 Pages 1300-1304
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1305-1308
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1309-1312
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese], [in Japanese]1986 Volume 52 Issue 8 Pages 1313-1316
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1317-1318
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese]1986 Volume 52 Issue 8 Pages 1319-1320
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1986 Volume 52 Issue 8 Pages 1321-1325
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1986 Volume 52 Issue 8 Pages 1326-1333
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
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Study on Surface Characterization of Cutting Tool Material and Prevention ofIts Brittle Fracture (Part 2)Noboru IIJIMA, Hidehiko TAKEYAMA, Yukihiro YAMAMOTO1986 Volume 52 Issue 8 Pages 1335-1341
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the 1st part of this study it was demonstrated that the surface treatments or processings of cutting tool greatly affect adhesiveness of work material to the tool surface and hence tool life in view of brittle fracture due to metal adhesion. In this report the mechanism of initiation and growth of metal adhesion on the tool surface, and the process of brittle fracture of tool material due to metal adhesion are analyzed microscopically in order to develop practically justifiable surface treatments or processings to prevent brittle fracture of tool material which is caused by metal adhesion.View full abstractDownload PDF (18735K) -
Toshiyuki MIYAZAKI, Shunro YOSHIOKA, Norio KANEKAMA, Tatsuo KIMURA1986 Volume 52 Issue 8 Pages 1342-1347
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSHole formation in electron beam drilling of metals is mainly due to molten metal removal. In this process, there are two different removals : ejection outside the target and remaining around the hole on the target surface. In the present paper, measurement of these removals is carried out. Size of molten metal particle ejected from the target was obtained. The particles have the most probable value in their diameters determined for each metal and each pulse duration. The solidified metal volume remaining around the hole was also obtained. From these results, the remaining ratio of ejected molten metal from the target is determined. The major part of the molten metal remains around the hole for mild steel and ejected outside the target for aluminum.View full abstractDownload PDF (3451K) -
Machining Accuracy in Side Cutting TestsTomio MATSUBARA, Hisataka YAMAMOTO, Hiroshi MIZUMOTO1986 Volume 52 Issue 8 Pages 1348-1353
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the experimental analysis of the machining accuracy in end mill operations. The accuracy expected by the theory, which is defined by both the static stiffness of an end mill and the instantaneous cutting force, is verified by a series of side cutting tests. The results obtained are as follows : (1) The static stiffness of an end mill analyzed by transfer matrix method, the instantaneous cutting force estimated in a simple cutting model, and the accuracy determined by these are fairly in accord with the experimental results. (2) The accuracy lowers with increasing feed, width of cut and helix angle, while depth of cut hardly influences it in usual operations. (3) The shape of the cross sections of the workpiece produced in the side cutting can be estimated by the cutting force component Fy (normal to the cut surface).View full abstractDownload PDF (1051K) -
Eiji USUI, Takahiro SHIRAKASHI, Tohru IHARA1986 Volume 52 Issue 8 Pages 1354-1361
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe paper criticizes validity of application of the linear fracture mechanics to impact brittle failure of carbide tool edge in interrupted cutting operation. The well known formulation of the linear fracture mechanics using Paris equation of crack growth is improved first so as to take into account dynamic effects on stress intensity factor, fracture toughness, and crack growth speed. An orthogonal interrupted turning with carbide tools having artificially inserted precrack is then conducted and tool life due to the edge failure is obtained. In comparison of the obtained tool lives with those predicted through the formulation of the linear fracture mechanics, it is revealed that the actual tool lives are far longer than those predicted for the crack length range smaller than 60 μm. It is also found that the crack smaller than 1 μm must be assumed as an independent, distinct crack in order to predict comparable tool lives to the actual ones. The reason of this discrepancy could be attributed to nonrealization of the small scale yielding at the crack tip in carbide tool material, which is the major premise of the linear fracture mechanics. An alternative method of the prediction based on the concept "isotropic deterioration" is recommended to be used.View full abstractDownload PDF (4362K) -
Yukitatsu KASHIMURA, Akira KITADA1986 Volume 52 Issue 8 Pages 1362-1368
Published: August 05, 1986
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn order to systematize the monitoring system for mischucking, the experimental investigation is made to clarify the difference between normal chucking and mischucking by using the three jaw scroll chuck. The main results obtained are follows : (1) A load cell built as a trial can measure not only the chucking force but also the effect of the centrifugal force on each jaw. (2) Mischucking deforms the triangle of the chucking force. (3) Mischucking increases the air leakage from the gap between workpiece and jaws. (4) A monitor of the chucking force, the triangle of the chucking force and the air leakage is effective to detect mischucking before cutting. (5) A monitor of the difference of revolution between the spindle and the rotary center is effective to detect mischucking during cutting on a lathe. (6) It is confirmed that a monitoring system developed and built as a trial operates exactly for mischucking.View full abstractDownload PDF (1331K) -
Micro-pin Fabrication and BondingFumikazu OOHIRA, Junpei SUZUKI, Junji WATANABE1986 Volume 52 Issue 8 Pages 1369-1375
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSFabrication and bonding technologies for micro-pins (diameter 90 μm) used in the packaging of Josephson chips are reported. Packaging technologies for Josephson chips are essential for satisfying the conditions of high packaging density, usability at low temperature and heat cycles. Toward this purpose, specially designed micro-pins are studied. The pin array is formed by electrodischarge machining (EDM) techniques using a metal sheet mask with precise hole diameters as the electrode from Pt sheet affixed to a Cu block. The pin heads are then inserted into the pin-carrier and glued using an adhesive. The pin-carrier is made from a Si wafer, having precise hole diameters fabricated by EDM corresponding to the pin array. Following the etching of the Cu block to personalize the Pt pins, solder is evaporated onto the bottom surfaces of the pin array. The pin array is subsequently bonded en masse employing the solder reflow operation on the substrate solder pads. Finally, the pin-carrier is removed in acetone. Through these processes, fabrication and bonding technologies for micro-pins used in high-packaging density (pitch 300 μm) apllications can be realized with high-precision and high-reliability.View full abstractDownload PDF (4540K) -
Takao YAKOU, Tadashi HASEGAWA, Hidehiko TAKEYAMA1986 Volume 52 Issue 8 Pages 1376-1382
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn order to identify the initiation site of chipping of cutting tool, face milling tests were carried out with cemented carbide tip (P20) on which microcracks had been artificially preformed at varied positions by electro-discharge machining (EDM). Microcracks existing in the minor cutting edge noticeably shorten the tool life in view of chipping, while those in the major cutting edge have little influence on it. Further, it has been verified that tensile residual stresses induced by EDM cannot be the main reason of shorter tool life. Taking into account the results of scanning electron microscopy of fractured tools, it is concluded that chipping is initiated from a microcrack existing nearly a feed per tooth apart from the corner in the minor cutting edge, whereas a microcrack closer to the corner tends to be rehealed during machining. This may be ascribed to the fact that the repeated "tensile" stress accelerates the growth of the former crack, while "compressive" stress and high temperature will reheal the latter. Suggestions to minimize chipping are as follows : (1) use of a tool without defect or crack along the minor cutting edge ; (2) preliminary cut at a larger feed than the job feed.View full abstractDownload PDF (11168K) -
Formation and Growing up Process of BurrSuehisa KAWAMURA, Junji YAMAKAWA1986 Volume 52 Issue 8 Pages 1383-1389
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of this study is to clarify the deformation of corner shape at the ground surface of workpiece. The grinding burrs of steel is chosen as the subject of the study, and the formation and growing up process of burrs are studied. The relation between size of burr and grinding condition, -such as depth of cut, number of grinding passes, table speed, grinding direction, hardness of material and edge angle, -is also investigated. The results obtained are as follows : (1) The grinding burr is classified in entrance burr, exit burr and side burr. The exit burr has a tendency to increase most in size. (2) The size of the burr is influenced considerably by hardness of material and edge angle. (3) The burr is formed by the residual stock removal at workpiece edge. The residual stock removal is pushed out at an angle with respect to the grinding direction by plastic bending.View full abstractDownload PDF (5464K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1986 Volume 52 Issue 8 Pages 1390-1392,1443
Published: August 05, 1986
Released on J-STAGE: February 16, 2010
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On the Variant Method Using Conjunction PatternHusang LEE, Hidenori SHINNO, Yoshimi ITO1986 Volume 52 Issue 8 Pages 1393-1398
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSWith the development of FMS, recently, various kinds of the machining center are being developed and their function and performance are being improved. In this regard, it is considered to be important to establish the CAD method of machining center. In this research, a desirable flow of the design system of machining center and a generating method of structural configuration have been investigated. The input of this design system is the specification of workpieces, and the output is the conceptional drawing of machining centers which have enough capabilities to machine the given workpieces. For the generation of the structural configuration, which is a part of the proposed design system, a hierarchical modular constitution method using the conjunction pattern is suggested. And also the case studies are carried out.View full abstractDownload PDF (1099K) -
Basic TheoryToyoshiro INAMURA, Mitsuru OHMORI, Mitsunori NAKAMURA, Takeshi YASUI1986 Volume 52 Issue 8 Pages 1399-1405
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA new method is proposed to evaluate the dynamic characteristics of a re-designed structure by using those of the original structure. The method is developed based on perturbation method in such a way that first the differential equations which describe the change of dynamic characteristics of being modified structure are derived by using perturbation method and then the solution curves of the equations are traced by those of the standard equations on manifold of special orthogonal group. The method has features that it can give clear correspondence between the eigenpairs before and after structural modification and that the computer run time is far shorter than that of conventional finite element analysis when only the selected few modes are used in the approximate computation. In addition, this approximate computation can give more accurate results than the perturbation method. Efficiency of the method is verified by a 600 degrees-of-freedom model which receives structural modification.View full abstractDownload PDF (1194K) -
Metrization of Concept Space and its Application to CAD SystemsTetsuo TOMIYAMA, Hiroyuki YOSHIKAWA1986 Volume 52 Issue 8 Pages 1406-1411
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper the autors discuss the metrization of concept spaces as an extension of General Design Theory, assuming a hypothesis that the attribute concept space is compact. According to the fact that the attribute concept space is a compact Hausdorff space, we can prove a theorem stating that this space is a distance space. This theorem gives us a way to organize our knowledge about entities using some attributive measures. An example of such metrization is presented. It also enables us to measure the convergence speed of the design solution, to utilize numerical methods to find the design solution, etc. From these discussions, we can get some theoretical remarks about data description methods for knowledge based CAD systems ; our result is that the data description method for future CAD systems should be denotative or extensional rather than connotative or intensional. This can be thought to be a very important contribution of General Design Theory to establishing the concepts of such future intelligent and integrated CAD systems.View full abstractDownload PDF (1254K) -
Representation and Inference of Numerical Design KnowledgesYoshiki KISHI1986 Volume 52 Issue 8 Pages 1412-1419
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, knowledge representations of numerical expressions and geometric structures in the mechanical design are discussed with an experimental frame system implemented on a Prolog coded in Lisp 1. 5. It is clarified that numerical expressions are translated into frametyped knowledges by hierarchical network with the order of calculation preserving. Moreover it is possible to insert design restrictions into the frames at any places. The inference of calculations is done with dedicated predicates called as demon-predicates according to the order of slots in the frame. A value of slot is a design variable, and in slots it is possible to direct the unit. If a slot has a unit, the unit-demon converts the slot value from the values' own unit to the directed one. In case of the geometric structures, it is found that the structures are represented into the frame-typed knowledge with the B-reps data structure of them preserving. And it is ascertained that the moving process of vectors are represented in frame by extending the methods of numerical expressions. The inference of getting vector data of the structures is executed by the top-down searching. To simplify representing structures, some prototype structures such as the square and the cube are applicable.View full abstractDownload PDF (1511K) -
Takeshi KISHINAMI, Hisashi NAKAMURA, Katsumasa SAITO, Akitoshi KAMEI1986 Volume 52 Issue 8 Pages 1420-1425
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper presents a newly developed 3-D tactile sensing probe head for 3-D curved surface measuring which is based on detection of normal vector of surface to be measured. The method of detecting the contact pressure and normal vector of measuring surface, by eliminating the friction force of contact with surface and probe using probe axis oscillation mechanism, is theoretically proposed. The 3-D probe head which is based on this principle, is developed and has the ability to detect the normal vector of measuring surface to within 1.5 degree of accuracy. An automatic 3-D surface measuring machine is developed by combining the developed 3-D probe head and computer controlled NC milling machine.View full abstractDownload PDF (1002K) -
Atsuo MURATA, Yasufumi KUME, Fumio HASHIMOTO1986 Volume 52 Issue 8 Pages 1426-1430
Published: August 05, 1986
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn mechanical system, there are many discontinuous phenomena such as the bistable vibration of rotor caused by unbalance, the nonlinear torsional vibration of power transmission system, the jump phenomenon of nonlinear dynamic vibration absorber and the jump phenomenon of conical spring. Catastrophe theory provides a natural synthesis between the practical and theoretical aspects of such a phenomenon. Metal spring such as the nonlinear coil spring and progressive spring has nonlinear restoring force. Diaphragm air spring has nonlinear spring characteristics. These springs are effective for vibration isolation. In this study, nonlinear forced vibration with one-degree-of-freedom is taken up, and the characteristics of Duffing's equation are explained by means of the bifurcation set and catastrophe manifold of cusp catastrophe. And, it is clarified that the jump phenomenon of this system is described by the bifurcation set and catastrophe manifold of cusp catastrophe.View full abstractDownload PDF (853K) -
Fatigue Life and Growing Characteristics of Fatigue Failure of Preloaded Ball Screw with Double NutHirokazu SHIMODA, Minoru IZAWA1986 Volume 52 Issue 8 Pages 1431-1436
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSFatigue life characteristics of ball screw with a single nut was discussed in the first report. The present report deals with the experimental results on the fatigue life of preloaded ball screw with a double nut, the relationship between the fatigue life and preload, and the dependency of friction torque with the growth of fatigue failure. The main results are as follows : (1) The dispersion in the fatigue life of preloaded ball screw with a double nut is fairly small same as that of ball screw with a sigle nut. (2) The mean value of Weibull slope e is 6.5 from the life tests of 75 ball screws in the 1st and 2nd reports. (3) Growth of the initial fatigue failure in ball screw is fairly slow because ball screws have large number of active balls compared with ball bearings. (4) Ball screw is maintained at a mechanical efficiency above 90%, until the ball screw revolutions exceed about 2.4 times the initial fatigue life. (5) The exponent p in the life formula L=(C/F)p for ball screws is 3 same as ball bearings.View full abstractDownload PDF (1342K) -
Shigeki OGAWA, Hiroshi HORIKAWA1986 Volume 52 Issue 8 Pages 1437-1442
Published: August 05, 1986
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSWith the growth in Video Communications and Data Information Processing Services, a Memory Disk Equipment using a laser beam, has come into wider use. In order to utilize a Laser Beam Disk as a large capacity date file, an optical head which writes or reads the information on the disk, must be driven at high-speed and high-accuracy over long distances. The authors have designed a moving coil linear DC motor whose magnetic circuits consist of many pairs of magnets to meet the above conditions and to make the motor structure more compact. Meanwhile, the basic study on tracking control using the linear motor has been carried out. Consequently, follow-up characteristics have been improved by using feed-forward control.View full abstractDownload PDF (5222K)
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