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Volume 44, Issue 522
Displaying 1-19 of 19 articles from this issue
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Positioning Accuracy of Machine Tool Table (2nd Report)Hiroshi MIZUMOTO, Tomio MATSUBARA, Naoya IKAWA1978 Volume 44 Issue 522 Pages 653-659
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the 1st report, it was shown that the positioning accuracy of machine tool table can be described with the over travel length XOR of the table after the moment of the positioning signal input, and the limitation of the positioning accuracy may be given with the dispersion of XOR caused by the fluctuation of frictional force in slide way. In the present paper, the correlation between the repeatability of positioning of the table and the fluctuation of frictional force in slide way is investigated under various conditions, and the following conclusions are obtained: (1) By decreasing the surface roughness of slide way, the fluctuation of frictional force in slide way may decrease and high repeatability can be achieved. (2) The periodicity of low frequency in the surface roughness of slide way makes the positioning accuracy lower. (3) At a particular feed velocity, the fluctuation of frictional force in slide way may cause a kind of resonance in feed drive device.View full abstractDownload PDF (1421K) -
On the Improvements of Nut Thread FlankShigeru INOUE, Shaji SUGINO, Toshimaro MIYAZAKI1978 Volume 44 Issue 522 Pages 660-665
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, the method of machining and the experimental result of three types of nut thread flank for improving the lubricating property of lead screws are described, namely the nut thread flank with sloped entrance gap on the nut thread face, the nut thread flank with three dents per one pitch on the nut thread face, and the nut thread flank with hydrostatic recess. The obtained results are as follows.
(1) The nut thread flank with sloped entrance gap on the nut thread face can be machined simply with excellent accuracy when the pitch is changed by exchanging the change gears of a lathe.
(2) As for the nut thread flank with three dents per one pitch on the nut thread face and the nut thread flank with hydrostatic recess, the required forms can be obtained simply when a pair of eccentric gears are used in the change gear train of a lathe.
(3) As for the experimental results, the minimum frictional coefficients of the nut thread flank with sloped entrance gap and the nut thread flank with three dents per one pitch on the nut thread face were O.12 and O.08, respectively. In case of the nut thread face with hydrostatic recess, the minimum frictional coefficient resulted in 0. 004, and the peculiar property to the hydrostatic lead-screw and nut assembly was shown.View full abstractDownload PDF (980K) -
Masanori YOSHIKAWA, Michail KISELJOV, Sakurao NEMOTO, Eiji MORI, Takas ...1978 Volume 44 Issue 522 Pages 666-671
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the process of lapping of the conical surfaces which is carried out with longitudinal ultrasonic vibration. The influences of the ultrasonic vibration on the metal removal, on the friction force and on the roughness of the machined surfaces were studied. The main results are as follows: Application of the ultrasonic vibration in the lapping process of the conical surfaces gives the possibilities considerably to increase the metal removal. Besides, the effect of the influence of ultrasonic vibration on this parameter depends on the ratio between velocities of vibration and of rotation, with increasing of which the metal removal becomes more. The friction force can be reduced in comparison with the conventional lapping process and the effect of reduction also depends on the ratio between velocities of vibration and of rotation. There are optimum conditions where the application of ultrasonic vibration gives the possibilities to improve the roughness of machined surfaces comparing with conventional lapping process.View full abstractDownload PDF (1086K) -
The Property of Cutting Forces and the Effect of Guide-pad Location on itKeizo Sakuma, Koichi TAGUCHI, Akio KATSUKI1978 Volume 44 Issue 522 Pages 672-677
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe guide-pads of BTA system solid boring tools counterbalance the cutting force produced on cutting edge, and the wall surface of drilled hole is burnished by the guide-pads under supporting forces. In this paper, the property of forces acting on tool is analized and the effect of guide-pads location on it is discussed. The drilling torque can be divided into the real cutting component on cutting edge, the frictional component in proportion to real cutting torque and the burnishing component not proportional to it. The relationship between the magnitude of the forces on the supporting pads and their locations are discussed. The locations of guide-pads, where stable cutting can be performed, are analytically obtained. From the analysis and the experiments, it is concluded that the drilling torque, the amount of the oversize of hole and the roundness error are increased when the location of first guide-pad is shifted towards the cutting edge.View full abstractDownload PDF (1098K) -
Studies on Heavy Grinding (2nd Report)Heiji YASUI, Tetsuo MATSUO, Mitsuaki MORIFUJI1978 Volume 44 Issue 522 Pages 678-684
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the present research, the wear mechanism of grinding wheel in high-depth of cut wet surface grinding has been examined by measuring the radial wheel wear, the grinding force and the distribution of cutting edges, and observing the working surface of grinding wheel under wet and dry operating conditions. Futhermore, the influence of the theoretical metal removal rate Zth on the wear rate of grinding wheel has been investigated in order to grasp the wear characteristic in high-depth of cut wet surface grinding. The main conclusions are as follows:
(1) The quantity of loading in wet grinding is much lower and less than in dry grinding.
(2) It is considered that the wear characteristic in wet grinding is influenced by the decrease in fracture strength of cutting edges concerned with using the cutting fluid.
(3) As Zth increases, the wear rate is inclined to increase steeply.
(4) In the range of the Zth over a critical value, the actual metal removal rate does not increase even if the increase of Zth is arranged.View full abstractDownload PDF (1574K) -
1978 Volume 44 Issue 522 Pages 684
Published: 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (213K) -
Michiko MINO, Junji WATANABE1978 Volume 44 Issue 522 Pages 685-691
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA narrow gap of the ferrite core is formed by pouring molten glass. Mutually diffused elements distribution of the glass and ferrite during forming were estimated by XMA and the relations between diffusion depth and bonding conditions were clarified. Also, the reluctance of the diffusion layer was investigated. The glass flow depth into the narrow gap was investigated under the temperature c onditions without diffusion. The results obtained are as follow.
(1) The glass elements diffusion is dominated at the Mn-Zn ferrite grain boundaries. Under working temperature condition, no diffusion at interface is detected by XMA.
(2) The reluctance of the diffusion layer can be estimated by the following method. A core with a diffusion layer in the magnetic path is made. Core reluctance is measured by vector-impedance meter in steps every time when the diffusion layer is polished off little by little. At the diffusion layer nearest the matrix ferrite, permeability is decreased to 10-2 times the original value.
(3) Equation of motion for conventional viscous fluid can be applied for glass flow characteristics.View full abstractDownload PDF (1502K) -
Akira YAMAMOTO, Takashi UEDA1978 Volume 44 Issue 522 Pages 692-697
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe reinforcement to acting grits is one of the most important properties that a filling material can contribute to the exaltation of finishing performance, and also the lubricating ability is requisite for acquisition of a smooth surface. In this paper, by adding the solid lubricant, such as graphite, molybdenum disulfide, Teflon and graphite fluoride, to the filling material of phenol resin superior in reinforcing only, the further elevation of stick's performance is studied and the influence of lubrication on the performance is discussed. Containment of these lubricants brings the rise in critical stone pressure and the decreases in stone wear, amount of stock removal and surface roughness. On the other hand, as the decreases in the last three are brought also by addition of these lubricants to the honing oil, these can be understood to result from the effective lubrication. For example, to gain the smooth surface, there is an optimum content and its content generally gives also the maximums in stone hardness and critical stone pressure. Moreover, applying these conclusions to sulfur, the treated stick with it containing graphite exhibited surpassed performance, especially in surface finish.View full abstractDownload PDF (1155K) -
Ichiro YAMADA1978 Volume 44 Issue 522 Pages 698-703
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn data communication I/O equipment, many colliding vibrations of mechanical components are observed. Rebounds of the components often prevent the equipment from operating at a high speed. In order to decrease these rebounds, this paper discusses the rebound of a uniform beam colliding with a rubber stopper. Replacing a rubber stopper with 3-element viscoelastic model, the colliding vibration of a uniform beam is analyzed. Computed results are as follows: (1) Optimal stopper position that minimizes the rebound exists on the beam. (2) The larger spring constant ratio γ of the stopper is, the smaller the rebound becomes. (3) The larger press angle ψs is, the smaller the rebound becomes, but the optimal stopper position is unchanged. Experimentally, these results are confirmed. Additionally, this paper describes that the replacement of a rubber stopper with 3-element model is reasonable, and that three constants of the model can be estimated from the experimental data on impact force and deformation.View full abstractDownload PDF (1010K) -
Effect of Shapes of GrooveYoshio ISHIKAWA, Minoru SUDA1978 Volume 44 Issue 522 Pages 704-709
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes a study of the friction produced when a hard steel ball rolls on a various guide, that is, a flat plate, a round groove and a V-shaped groove, under the conditions changing the ball diameter and the radial force at a rolling speed of 0.03 mm/s. The experimental results were compared with the calculated values. The results obtained are as follows.
(1) When a ball rolls on a flat plate or a V-shaped groove, the frictional force increases as the ball diameter decreases, but on a round groove, it shows a contrary tendency.
(2) On the same conditions, it is seen that the value of coefficient of the rolling friction is 10-5 for a flat plate, 10-4 for a round groove, 10-3 for a V-shaped groove. The differences of the frictional force are caused by the differential slip friction.View full abstractDownload PDF (827K) -
Basic Study on Residual Stresses in Uni-directional Machined Layers (1st Report)Mikio WAKABAYASHI, Mamoru NAKAYAMA1978 Volume 44 Issue 522 Pages 710-716
Published: June 05, 1978
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSEquations could be derived which calculate the macro-residual stresses and the micro ones using residual strains measured by X-ray in cutting and grinding layers of carbon steel. In such a case that macro principal axes of residual stresses and micro ones tilt independently at the surface, generally it is difficult to seperate macro-residual stresses from micro ones with calculations. In this report, it is mainly described that a case of the only principal axes of micro residual stresses tilt at the surface of a specimen. A method was tried which determined the tilting angles of one of the principal axes of the micro-stresses against the surface of a specimen from the concentration point of a texture. Resulting from theoretical and experimental analyses, the mean values of two sin2ψ diagrams in machining direction were proved to show the linearity. Three factors deciding the sin2ψ diagrams were also shown theoretically.View full abstractDownload PDF (1053K) -
Nobuo YASUNAGA, Akira OBARA, Osamu IMANAKA1978 Volume 44 Issue 522 Pages 717-723
Published: June 05, 1978
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSFew Systematic studies have been made on the chemical phenomena at the contact interface between the tool and work materials in grinding or cutting process. In this paper, the role of interfacial solid state reactions on the wear of sapphire sliding on steel is investigated by means of X-ray analyses of wear products. The main results obtained are as follows:
(1) The α-Fe2O3 and Fe3O4 debris produced at the sliding interface promote the wear of sapphire. This effect is considered to be caused by the solid state reactions at the real contact points.
(2) Almost all worn sapphire exists only as reaction products, namely as Fe3O4-FeAl2O4 and/or α-Fe2O3-Al2O3 solid solutions.
(3) Sapphire wear purely caused by mechanical action is negligible.View full abstractDownload PDF (1450K) -
Optimum Design of HammerToshimichi MORIWAKI, Kazutaka ASHIDA, Kazuaki IWATA1978 Volume 44 Issue 522 Pages 724-729
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSShock excitation testing based on Finite Fourier Transform has become a most widely used method for measuring dynamic characteristics of machine tool structures owing to recent developments in technologies of hardware and software, such as minicomputer, FFT (Fast Fourier Transform) algorithm, etc. However, few researches have been carried out to optimize hammer design which is of prime importance to better utilize the technique. The present study aims at establishing an optimum design procedure of hammer. Shock excitation process by a hammer was first simulated with use of a digital computer, and it was confirmed that the simulated impact force coincided quite well with the measured one. The effects of hammer weight, stiffness of pad, initial velocity of hammer and dynamic characteristics of excited system upon the maximum value and duration of impact force, the force-time integral and the amplitude of vibration were analyzed to obtain criteria of the design parameters. The relation between the optimum duration of force and the sampling interval for a given frequency range was also analyzed. A general procedure to decide recommended sampling interval and duration of force is given.View full abstractDownload PDF (996K) -
Measurement of Total Error Motion with a Rotating WorkpieceYoshiaki KAKINO, Nobuo ISHII, Kiyotaka KOGA, Yuzuru YAMAMOTO, Keiji OK ...1978 Volume 44 Issue 522 Pages 730-736
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA new measuring method has been developed for measuring radial, angular and axial error motions of an axis with a rotating workpiece. The measuring and cutting tests were conducted with a lathe to verify this method. The measured radial and axial error motions of the axis were compared respectively to the out-of-roundness profile and face profile of the workpiece which was machined by a diamond tool. The following conclusions were obtained:
(1) Radial, angular and axial error motions were measured exactly by detecting the fluctuations in the gaps between two master balls attached to the spindle and three pick-up devices attached to the tool post.
(2) Radial and axial error motions measured by this method correspond closely and respectively to the out-of-roundness profiles and face profiles of the workpiece, machined by a diamond tool.View full abstractDownload PDF (1215K) -
[in Japanese], [in Japanese]1978 Volume 44 Issue 522 Pages 737-739
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (616K) -
[in Japanese]1978 Volume 44 Issue 522 Pages 740-744
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (2134K) -
[in Japanese]1978 Volume 44 Issue 522 Pages 745-749
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1666K) -
[in Japanese], [in Japanese]1978 Volume 44 Issue 522 Pages 750-756
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese]1978 Volume 44 Issue 522 Pages 757-764
Published: June 05, 1978
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1976K)
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