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Volume 50, Issue 10
Displaying 1-22 of 22 articles from this issue
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[in Japanese]1984 Volume 50 Issue 10 Pages 1531-1536
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1537-1543
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese], [in Japanese]1984 Volume 50 Issue 10 Pages 1544-1549
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1550-1555
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese], [in Japanese]1984 Volume 50 Issue 10 Pages 1556-1559
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1560-1567
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1568-1574
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1575-1580
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese], [in Japanese]1984 Volume 50 Issue 10 Pages 1581-1588
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese]1984 Volume 50 Issue 10 Pages 1589-1594
Published: 1984
Released on J-STAGE: June 30, 2009
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[in Japanese], [in Japanese]1984 Volume 50 Issue 10 Pages 1595-1600
Published: 1984
Released on J-STAGE: June 30, 2009
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A Study from the View-point of Thread Shearing and Bending in the Part of Thread EngagementKen-ichi SAITO1984 Volume 50 Issue 10 Pages 1601-1606
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes the experimental and theoretical consideration on the load capacity of plastics boltnut joints in the part of thread engagement. Firstly, the tensile tests of the threaded assemblies are carried out to clarify the failure modes and the failure load under some conditions of lubrication, material of nut and temperature. As a result, it is found that there are two different failure modes in the part of thread engagement, that is, shearing and bending of the threads. Secondly, the method to predict the load capacity is proposed for these two failure modes. The main conclusions are as follows : (1) The load capacity of threaded assembly with steel nut is greater than that with plastics nut. (2) When bolt and nut are both plastics, the load capacity decreases by lubricating. (3) The failure modes in the part of thread engagement are influenced by condition of lubrication and rigidity of nut. (4) The values predicted by the proposed method agree fairly well with the experimental results.View full abstractDownload PDF (1033K) -
Nobutoshi OHASHI, Mitsutoshi ISHIMURA1984 Volume 50 Issue 10 Pages 1607-1612
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, the comparison of the elastic region tightening with the plastic region tightening is investigated with emphasis on reusing characteristics of bolts. The tightening and loosening of bolts and nuts are repeated in tightening tests by the torque gradient, the angle and the torque control methods, respectively. The following results are experimentally confirmed: (1) The tightening axial force increases with number of repetitions by every control method, but the torque gradient control method which tightens bolts to the limit of elasticity is the most stable one. (2) The torque gradient control method is superior to other ones with regard to the reusing characteristics in the condition that an external force is loaded and unloaded to the fastened bodies in the direction of the bolt axis. (3) Plastic elongation of the bolts by the angle control method of plastic region tightening generates at the idle thread part between the fastened bodies, and then spreads to the fitting part of the bolts and nuts as the number of repeated tightening increases, so that the number of reusing cycle is limited.View full abstractDownload PDF (978K) -
Isamu YOSHIMOTO1984 Volume 50 Issue 10 Pages 1613-1616
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn ISO/TC 10 the standardization on the geometrical tolerancing is being discussed, and now the relationship between dimensional and geometrical tolerances is treated. In the standards concerning the accuracy specifications of screw threads and gears the geometrical tolerancing seems not to be taken into consideration. It is not always necessary to express the accuracy of screw threads and gears by using the geometrical tolerancing. But the discussion on the expression of accuracy of screw threads and gears by geometrical tolerancing can clarify the meaning of their tolerances. In this report the accuracy specifications of screw threads and gears are discussed from the view point of geo-metrical tolerancing. One of the main conclusions is as follows: the interpretation for the pitch diameter tolerance of screw threads corresponds to the Envelope Requirement in the geometrical tolerancing, while the dimensional and geometrical tolerances in the case of gears are independent each other.View full abstractDownload PDF (778K) -
Yoshihisa TANIMURA, Kouji TOYODA1984 Volume 50 Issue 10 Pages 1617-1621
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSNon-contact measuring instrument with laser interferometer is described in this paper, which can measure the coordinates of micro-shapes on a machined surface. When laser beam in the instru- ment is focused by an objective lens of 40 × and N. A. 0.65, the measurable height of micro-shapes is less than 3. 5 μm as a main performance and the measurable inclination is less than ±5.2°. The linearity is kept between lateral (X-axis) and ver-tical (Z-axis) displacements. By using the instrument, the following shapes can be measured : cross section of roughness comparison specimen, microstep height on a silicon wafer and cross section of scratched grooves on aluminum. Their results are compared with the results measured by stylus instrument, interference microscope and scanning electron microscope. The measurement accuracy of the present instrument can be estimated better than ±5 nm in the scattered range of measured values.View full abstractDownload PDF (1390K) -
Munehiko YOKOGAWA, Kazuhiko YOKOGAWA1984 Volume 50 Issue 10 Pages 1622-1627
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSAn optimum grinding condition was found by making clear the relation between the grinding performance of CBN grinding wheel and the grind-ing mechanism. Following results are obtained : (1) Considering cutting and slipping areas, the limited stock removal per wheel circumferential length is expressed as functions of grain depth of cut and arc of contact. (2) The optimum grinding condition is determined by the intersection of these functions. (3) The optimum peripheral speed of workpiece must be lowered as the stock removal rate increases.View full abstractDownload PDF (933K) -
Junichiro KUMABE, Ryuuichi HORI, Masato HIROSE1984 Volume 50 Issue 10 Pages 1628-1633
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this report, it is analyzed that precise center holes can be obtained by using a new vibration lapping process. And this analytical results can be confirmed by the experiments using a newly lapping device with the stepping motor and ultrasonically vibrated lap. The main experimental conditions are as follows: frequency ; 100 Hz, 30 kHz, abrasive grain; WA# 280, WA#800, concentration; 70 wt%, lapping fluid ; light oil, working pressure; 0.2 MPa, lap material; cast iron (FC 20), work material; carbon steel. The main results are as follows: (1) Under above conditions, precise center holes are machined efficiently as compared with the conventional lapping. (2) It is found that the roundness≈0 vibration turning is succeeded by using the work arbor with this center hole. From these results, it is proved that a center hole can be precisely machined by means of this new lapping process. (3) And more, a new superposition vibration lapping device using an electric-stepping motor and ultrasonically vibrated lap is created, it is confirmed that precise center holes can be machined more efficiently. (4) Therefore, it is considered that this lapping process and device will greatly improve lapping efficiency and accuracy of center holes.View full abstractDownload PDF (1409K) -
Influence of Shape of WorkpieceKoichi TAGUCHI, Akio KATSUKI, Keizo SAKUMA1984 Volume 50 Issue 10 Pages 1634-1639
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe influence of the shape of workpiece on the deviation of machined hole is studied in a variety of case of deep hole drilling. Especially, the effect of extremely unsymmetric thickness of hole wall, inclined front work-face and eccentric prebored-hole, etc. is discussed. When a workpiece with an eccentric prebored-hole is drilled, the machined hole curves toward the direction of the vector of maximum cutting force. This phenomenon is due to the fact that the hole wall deforms plastically by the pressure of the guide pad which supports a cutting force. When the drill starts to cut near the border of front work-face, the hole curves toward the thinner hole wall. This phenomenon results from the elastic deformation of the hole wall. And when drilling starts at an inclined front work-face, the hole shifts at its entry toward the direc-tion of slope of front face. Such a deviation tends to increase with the increase of cutting depth. The theoretical value of such hole deviation are in good agreement with the experimental ones. Further, it is shown that indirect factors, e. g., tool geo-metry, guide bushing, cutting conditions and work material, etc., also cause the deviation of machined hole.View full abstractDownload PDF (1113K) -
Correlation between Sound Pressure and Abrading ActionTakashi UEDA, Katsunori OZAWA, Akira YAMAMOTO1984 Volume 50 Issue 10 Pages 1640-1645
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe machining noise produced in honing operation is called honing sound. The purpose of this paper is to investigate experimentally the characteristics of this sound, the correlation between its sound pressure and abrading action, and the influence of the stone pressure on it. Moreover, some discussions are had to find how collectly the honing sound monitors the cutting action of sticks. The results are as follows. This sound varies with time both in frequency and magnitude, and its spectrum has the maximum peak at about 1 200 Hz. Its sound pressure is much higher than that of turning noise or grinding one. When the sticks keep the condition of self-dressing and cutting, the honing sound with high sound pressure is produced, but as soon as they start to glaze, its magnitude becomes small. Therefore, the soud pressure is higher under severer honing conditions. Particularly, it increases greatly when the stone pressure is just beyond the critical one. The honing sound is positively applicable as a signal to monitor the cutting action of sticks, because the strong correlation is observed between its sound pressure level and the depth of cut of a stick.View full abstractDownload PDF (2808K) -
Katsumi YAMAGUCHI, Kiyotaka KATO1984 Volume 50 Issue 10 Pages 1646-1651
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSNew method of measurement of pressure distribution between contact surfaces is developed. When hard and fine powder is scattered on smooth surface and it is pressed against an another surface, micro plastic deformations are caused on the smooth surface and surface roughness changes. The roughness parameter Ra/Rmax (center line average/ maximum roughness) is introduced on the basis of the theoretical considerations of the micro deformations caused by pressure, and it is proved experimentally that the change of the parameter connects with pressure acting on the contact surface. Some examples of the pressure distribution measured with this method are shown.View full abstractDownload PDF (1250K) -
Optical Instrument for Identifying Edge Topography with Aid of Pattern Recognition TechniqueEiji USUI, Toshiyuki OBIKAWA, Shinsaku HAGIWARA1984 Volume 50 Issue 10 Pages 1652-1658
Published: 1984
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSAs will be shown in the later papers, edge frac-ture of abrasive grain during grinding can be regarded as simple, homogeneous Markov process. In order to analyze variation of edge shape distribution of abrasive grains with grinding time as Markov process, an optical instrument which enables us to detect the edge shape was specially designed and built. Reflected laser light beams from the apex of a grain are received by 25 photodiode plates which are laid out to form a convex semispherical detecter. It is possible to infer the topography of the edge constitution from the pattern of output distribution of the diodes. The inferred edge shapes were verified to be in good agreement with those of the grains shown in photomicrographs. Based upon the experimental results with this instrument, 10 typical models of the edge shape are presented. The pattern recognition tech-nique is further introduced to the measuring system, which allows to identify and classify the out-put pattern of the photodiodes automatically into the edge models proposed.View full abstractDownload PDF (1550K) -
Makoto OGAWA, Kazuo NAKAYAMA1984 Volume 50 Issue 10 Pages 1659-1664
Published: 1984
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSNicks engraved on the cutting edges of a twist drill split the chips into narrow bands which can easily flow out of the hole through the flutes of drill. As the result, the performance of the drill is improved considerably, especially when the depth of hole exceeds its diameter. Experiments in this paper show the effects of nicks such as lowered torque, smoother surface finish, diminished bur at the outlet of hole and the prolonged drill life : In a series of drilling test of φ 6 holes in 0. 45% C steel, nicks prolong the drill life up to ten times as long or even more. For the higher productivity, feed rate can be increased by about 30% without shortening drill life.View full abstractDownload PDF (1418K)
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