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Volume 53, Issue 10
Displaying 1-26 of 26 articles from this issue
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Nobuo YASUNAGA, Toshiyuki MIYAZAKI, Shojiro MIYAKE1987 Volume 53 Issue 10 Pages 1503-1506
Published: 1987
Released on J-STAGE: June 30, 2009
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Yoichi HIROSE1987 Volume 53 Issue 10 Pages 1507-1510
Published: 1987
Released on J-STAGE: February 16, 2010
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Yoichiro SATO1987 Volume 53 Issue 10 Pages 1511-1514
Published: 1987
Released on J-STAGE: June 30, 2009
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Tadao INUZUKA, Atsuhito SAWABE1987 Volume 53 Issue 10 Pages 1515-1518
Published: 1987
Released on J-STAGE: June 30, 2009
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Kumiko HIROCHI, Makoto KITABATAKE1987 Volume 53 Issue 10 Pages 1519-1522
Published: 1987
Released on J-STAGE: June 30, 2009
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Yoshikatsu NAMBA1987 Volume 53 Issue 10 Pages 1523-1526
Published: 1987
Released on J-STAGE: June 30, 2009
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Takashi ISHIGURO, Hidetoshi SAITOH, Yukio ICHINOSE1987 Volume 53 Issue 10 Pages 1527-1531
Published: 1987
Released on J-STAGE: June 30, 2009
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Shinei MINETA, Nobuo YASUNAGA1987 Volume 53 Issue 10 Pages 1532-1535
Published: 1987
Released on J-STAGE: June 30, 2009
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Konosuke INAGAWA, Kazuhiro WATANABE, Kazuya SAITOH, Yoshiyuki YUCHI, A ...1987 Volume 53 Issue 10 Pages 1536-1539
Published: 1987
Released on J-STAGE: June 30, 2009
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Mamoru SATOU1987 Volume 53 Issue 10 Pages 1540-1543
Published: 1987
Released on J-STAGE: June 30, 2009
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Ken SAKAMURA1987 Volume 53 Issue 10 Pages 1546-1549
Published: 1987
Released on J-STAGE: June 30, 2009
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Haruyoshi AOKI, Keiichi OGAWA1987 Volume 53 Issue 10 Pages 1550-1554
Published: 1987
Released on J-STAGE: June 30, 2009
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Akiyoshi KOBAYASHI1987 Volume 53 Issue 10 Pages 1555-1561
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCutting characteristics on slotting of endmill, that is the most complicated cutting method of milling, are examined experimentally. From the precise measurements of cutting resistance variation and surface roughness in one cutting cycle, it is clarified that table feed direction force does not change the direction at 90°of rotating angle of cutting edge which is the turning point between up-cut milling and down-cut milling, but changes the direction at about 120° of rotating angle of cutting edge and surface roughness changes into four stages in one cutting cycle. Moreover, it is clarified that transient up-cut milling region exists between 90° and about 120° of rotating angle of cutting edge.View full abstractDownload PDF (1064K) -
Yoshiaki HAGIUDA, Katsuhiko KARIKOMI, Takeo NAKAGAWA1987 Volume 53 Issue 10 Pages 1562-1568
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA diamond grinding stone bonded by sintered cast iron powder as the matrix has been developed. This stone was applied to lapping, superfinishing, honing and grinding, and showed a highly improved grinding ability especially for hard and brittle work materials. This paper describes the manufacturing process of the stone and some results of the experiments concerning the stone materials. Diamond abrasives are mixed with cast iron powder and carbonyl iron powder which is added in order to get strong abrasive retention. This mixture is compacted into a grinding stone by press forming or roll forming process and then sintered 1 140°C for 30 minutes in an ammonia cracking gas atmosphere. As the result, the diamond particles are distributed uniformly and bonded firmly in the cast iron matrix which consists of pearlite, ferrite and flake graphite, so that the grinding property of the stone is improved and the dressing becomes relatively easier. The effects of the size and the content of the abrasive and the amount of the carbonyl iron powder are discussed from the mechanical properties of the grinding stone estimated by radial crushing strength test and bending test. It has been found that the residual quantity of the diamond at the sintered temperature is about 84 wt%.View full abstractDownload PDF (3303K) -
Grinding Performance of Wheel with Crush DressingToshikatsu NAKAJIMA, Yoshiyuki UNO, Tatsuto TACHIBANA1987 Volume 53 Issue 10 Pages 1569-1575
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCrush dressing process and grinding performance of crush-dressed wheel are experimentally investigated, analyzing dressing force, grinding force, wheel wear, surface roughness and so on. SEM observations of cutting edges and measurements of characteristic values to quantify the condition of cutting edges on the wheel surface are performed. Main results obtained in this paper are as follows : (1) There exists three distinct states in crush dressing process ; transient state, steady state and crush-out state. (2) The higher the number of revolution of grinding wheel in crush-out dressing is, the larger grinding force and the less surface roughness and wheel wear rate become. (3) Higher infeed rate of crush roll results in sharper cutting edges and less cutting edge density, which leads to lower grinding force, larger surface roughness and higher wheel wear rate. (4) Softer wheel grade leads to lower grinding force and larger surface roughness. (5) Sharper cutting edges with lower cutting edge density are generated as compared with those in rotary dressing and conventional dressing.View full abstractDownload PDF (1365K) -
In Case of Cylindrical WorkpiecesYoshimi TAKEUCHI, Masafumi SAKAMOTO, Teruyuki ASAO, Taira NAKAMURA1987 Volume 53 Issue 10 Pages 1576-1581
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe study deals with the development of a tool position control device by means of a piezo-electric actuator and the compensation method of machining errors in turning. The tool position control device is mounted at the tool post of an NC lathe linked to a personal computer for DNC. The voltage control of the piezo-electric actuator by the personal computer makes it possible to slightly move the tool position in the depth of cut. The movement of tool on the basis of the machining errors leads to the improvement of machining accuracy. From experimental results concerning to cylindrical workpieces, it is found that the device has the potential of improving the machining accuracy.View full abstractDownload PDF (1147K) -
Koichi KITAJIMA, Yukio TANAKA, Jun NAKAMURA, Hiroshi ARIMOTO1987 Volume 53 Issue 10 Pages 1582-1588
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis study aims at a theoretical and experimental investigation on the improvement of dynamic rigidity of the complex tool shank by combining high-damping alloy with high-stiff material such as sintered carbide. There are various kinds of high-damping alloy, and SILENTALLOY of ferromagnetic kind is used in this case. The main conclusions obtained are as follows. (1) The damping characteristics in complex tool shank of sandwich construction depends on the outside materials. (2) The complex tool shank has the highest dynamic rigidity when it is constructed with SILENTALLOY on the inside and sintered carbide on the outside and its cutting stability against chatter vibration increases considerably.View full abstractDownload PDF (1012K) -
Effect of Temperature on Fracture Characteristics of Carbide Material and on Its Deterioration Process by Impact RepetitionTakahiro SHIRAKASHI, Tohru IHARA, Kenichi KANAZAWA, Eiji USUI1987 Volume 53 Issue 10 Pages 1589-1595
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSUsing the specially designed impact testing machine, the fracture characteristics of carbide material P 20 and its deterioration process by impact repetition are examined quantitatively under various temperature less than 800°C and under various impact duration. The main results obtained are as follows: (1) The fracture stress decreases with temperature increase, however the features of fracture are seen as a brittle one even at 800°C. (2) Both temperature and heating duration have no effect on the deterioration process by impact. The rate of deterioration depends on the impact stress and the number of impact but on the temperature. (3) Many small cracks or voids with random size and directions around WC particles in a sintered carbide are generated by both the cyclic uniaxial compressive and tensile impact, thus the isotropical deterioration may be expected in a carbide material. (4) The hypothesis for evaluation of the deterioration process by multiaxial stressing at any temperature less than 800°C is proposed.View full abstractDownload PDF (3772K) -
Machinability of Nimonic 80 A (1st Report)Masahiro MASUDA, Masashi TORII, Hiroki NAKAJIMA1987 Volume 53 Issue 10 Pages 1596-1601
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIt is well known that the tool life in machining nickel-based alloys depends mostly on the gloove wear of the cutting tool. In this paper, the influence of cutting force distributions along a side cutting edge on boundary failure in cutting Nimonic 80 A is examined and is compared with these of stainless steel (SUS 304) and carbon steel (S 45 C). To measure cutting force distributions the tool dynamometer, which has two cutting edges and can measure separately the cutting forces on these is used. Cutting forces on the boundary regions of a side cutting edge are considerably large in cutting materials that the boundary failure arises. These results are discussed by observing the surface hardness and the cutting bur. Further, this paper presents some methods on decreasing the gloove wear. The improvement of the rake face on boundary regions and the use of tool materials with high toughness are able to increase a tool life.View full abstractDownload PDF (4554K) -
Application to Plastic Injection Molding ProcessKenichi TANAKA, Masayoshi KOIKE, Takashi KAMOSHITA, Jiro MATSUDA, Hiro ...1987 Volume 53 Issue 10 Pages 1602-1608
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper presents an application of new statistical parameter optimization method to designing plastic injection molding process. Optimum condition is derived by combining highest level of SN ratio of each parameter. The SN ratio represents the variance of products and the process control ability in trial production on many parameter's conditions layouted orthogonal array. This optimization is carried out on two characteristics of products. Selection method of control parameters is discussed to reduce process fluctuation still remained after the parameter optimization. The effect of optimization and the possibility of control by the method are confirmed experimentally. The results show improvement in the process variance of more than 5 dB and possibility of both two-characteristics optimization and control.View full abstractDownload PDF (1016K) -
Kazuaki IWATA, Nobuhiro SUGIMURA, Eiji ARAI, Katsuya OTOI1987 Volume 53 Issue 10 Pages 1609-1615
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSRecently, particular emphasis has been given to development of product model aimed at realizing integrated CAD/CAM systems for machine products. The product model is required to include both the geometric information and the technological information such as accuracy data, surface roughness data and material data. This paper deals with a description method for accuracy of part in product modeling. The contents of information about the accuracy of part are investigated referring to the JIS dealing with "tolerances of form and position" and "system for limits and fits". Seven items are extracted through the investigation, which are needed to represent the accuracy data. A data structure is proposed to describe these items and to connect the accuracy data with the geometric information of part. Systematic procedures are developed to verify the consistency among the accuracy data, and to modify and expand the tolerance zones when a set of accuracy data given to the part are concatenated. It is shown, through case studies, that the description method and the procedures proposed here are effective for the product modeling in CAD/CAM.View full abstractDownload PDF (973K) -
Ryutaro MIYAJI, Minoru SUDA, Masami HARADA1987 Volume 53 Issue 10 Pages 1616-1621
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSRecently, gas bearings have been used in high technology industry. But, conventional bearings have obliged mean clearance to be as wide as 20-30 μm by the use of inherently compensated restrictors. In this paper, an externally pressurized gas journal bearing is made as an experiment, and load capacity, stiffness and gas flow rate are measured. The test bearing is 30 mm in length, 30 mm in diameter, 3 mm in pocket diameter and 0.05, 0.1 and 0.2 mm in orifice diameter respectively. Following conclusions are obtained. (1) By the use of pocketed orifice restrictors, the stiffness is the highest at 7-13 μm in mean radial clearance without generating pneumatic hammer instability. (2) As the bearing can be operated with a narrow clearance, gas flow rate is about 4 L/min with 0.1 mm in orifice diameter and 10 μm in radial clearance at supply pressure of 0.6 MPa.View full abstractDownload PDF (738K) -
Design and Simulation of a Nonlinear Control System of an Inverted Pendulum ModelKazuo YAMAFUJI, Qing FENG1987 Volume 53 Issue 10 Pages 1622-1625
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes the design and simulation of the postural control system of a twin cycle which has twin wheels on a driving axis and a controlling arm suspended from the upper structure. The three-degree-of-freedom twin cycle is modeled as a wheel and an inverted pendulum with a controlling arm pivoted at its upper end. The controlling arm rotates to give a pendulum restoring moment. A nonlinear feedback control system for the model has been designed using a unique model matching method with which time varying feedback coefficients are computed for each sampling time by coinciding the poles of the characteristic equation of the model with those of a given stable system. Simulation of the control systems has been carried out on a personal computer. The inverted pendulum system can be stabilized quickly against given initial disturbances.View full abstractDownload PDF (487K) -
Kenichi KANAZAWA, Akio KOHNO, Toshio SATA, Yoshio TASHIRO1987 Volume 53 Issue 10 Pages 1626-1631
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA new type of ultra-micro hardness tester has been developed in order to obtain precise indentation hardness of thin films and brittle materials. A differential coil with an accuracy of 0.01 μm is used in measurement of indentation depth instead of width. Electromagnetic force generated by applying an electric current to force coil is utilized for loading to a specimen, and so indentation hardness at a load of 9.8 × 10-5 N {10 mgf} can be obtained. Indentation test is automatically performed according to the program in microcomputer, and increasing load and indentation depth can be instantly recorded during the test. Use of microcomputer enables value of load and loading speed to be set over a wide range. A new method of finding out the surface of specimen is devised and experimentally confirmed. The indentation test in a few materials shows that the displacement of the indenter during loading is divided into the elastic and plastic ones with a high accuracy.View full abstractDownload PDF (2468K) -
Transmission of Rake Angle Error and Setting Error of a Hob to a WorkNoriteru NISHIDA, Youichi KOBAYASHI, Naohisa TSUKAMOTO, Tokihiko TAKI1987 Volume 53 Issue 10 Pages 1632-1638
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSWhen the values of coordinates and gradients at some points on a work tooth profile are given, the hob tooth profile can be calculated analytically. In this report, the tooth profile of hobs with rake angle and relief angle is calculated. Transmission of rake angle error and setting error of hobs to a work is analyzed. When the allowable value of a work tooth profile error is given, the allowable value of rake angle error and setting error of hobs can be decided by this method.View full abstractDownload PDF (831K) -
Shigeo MORIYAMA, Fumihiko UCHIDA, Eiichi SEYA1987 Volume 53 Issue 10 Pages 1639-1645
Published: 1987
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper presents a novel reflection coefficient correction technique for an optical fiber displacement sensor. The new technique uses conventional fiber prove, however, displacement signal and reflection coefficient signal are simultaneously detected with it, where illumination fiber functions for both irradiating a target plane and detecting reflection light from the target. An experimental setup consists of commercially available fiber prove and a laser diode was bulit, and it was found that measuring error was less than 0.05 μm even in case of target reflection coefficient changing from 40% to 95%. In this paper, measuring principle and design method for the optical system are described, also, some experimental results are discussed.View full abstractDownload PDF (1021K)
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