All issues
Volume 48, Issue 7
Displaying 1-21 of 21 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese], [in Japanese]1982 Volume 48 Issue 7 Pages 840-846
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1350K) -
Cause and Improvement of Deterioration of Finishing Performances in Steel Honing with Increased Cutting SpeedTakashi UEDA, Akira YAMAMOTO1982 Volume 48 Issue 7 Pages 847-852
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe purpose of this report is to investigate the cause of deterioration of finishing performances in 0.45% plain carbon steel honing with increased cutting speed and to find out the conditions and means which enable to improve the finishing performances. At high cutting speed, difficulty of removal of continuous flow type chip brings the results that finishing performances deteriorate extremely over a limited range of cutting speed, where chip welds severely on stick and work surface, and after all annealed steel can be no more machined. Taking notice of cutting speed, this phenomenon is similar to the growth of builtup-edge in cutting operation. One method capable to hone successfully at high cutting speed is to use a sulfur treated porous stick with big spherical pores which works effectually to removal of chip, but it ended in failure to make a smooth surface. Another method is to apply a sulfurized fatty oil, and this application made it possible to operate honing successfully over all tested range of cutting speed. Because, this oil has the effect to remove chip easily by preventing it from growing and welding.View full abstractDownload PDF (1397K) -
Optimum Design and Experiment of the Magnetic Dynamic Vibration Absorber with Unsymmetrical Nonlinear Restoring ForceHiroyuki KOJIMA, Sadahiko TAKEDA, Sigeo IKAI, Izumo YAMAKAWA1982 Volume 48 Issue 7 Pages 853-858
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSHow to find the tuning condition of the new type dynamic vibration absorber is investigated by means of the simplex method, and its results are compared with those of the equivalent linear spring method. At the same time, some experiments are carried out on the model apparatus with an adjustable damping device to ascertain the optimum condition deduced from the above methods. The results are summarized as follows. (1) The optimum distance between the fixed magnets increases as the exciting force is larger. The optimum natural frequency ratio decreases as the growth of the exciting force. These tendencies become more remarkable with the decrease of the mass ratio. (2) The optimum damping ratio of the absorber depends upon the strength of the exciting force, unrelated to the mass ratio. (3) The equivalent linear spring method is considered to be effective to demonstrate the qualitative meaning of the results (1) and (2), by reason that the increase of the exciting force in hard spring contributes to decrease the optimum natural frequency of the absorber. (4) It is easy to adjust the spring action between the magnets and the amount of the damping force to the optimum values, if the adjustable damping device used.View full abstractDownload PDF (792K) -
Friction and Wear Properties of MoS2 FilmMasakuni KAWADA1982 Volume 48 Issue 7 Pages 859-865
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSMoS2 dry lubricant film was deposited onto the surface of self-acting gas bearings by sputtering technique to improve the frictional properties for start-stop conditions. The sputtered MoS2 films (0.5-3 μm) were deposited on highly-finished metal surfaces. The low-speed sliding test shows that MoS2 films have a low coefficient of friction. To evaluate their lubricating properties for start and stop conditions, MoS2 films were deposited on spiral grooved thrust gas bearings (flatness of bearing surface 1 μm). Bearing coated with MoS2 film of more than 2 μm thickness could bear over 250 start-stop cycles. The frictional coefficient μ (calculated value from measured torque) of the MoS2 film coated bearings for start and stop conditions reached μ=0.3. Although the TiN film reported by the 1st report served mainly for surface hardening and prevention of surface damage, but the MoS2 film reported here was useful for improving the frictional property for start and stop conditions, particularly to decrease the starting torque. For practical use, TiN and MoS2 films were deposited onto the surface of self-acting gas bearings of a centrifugal helium compressor which operates in temperature about 80 K. These films showed the good friction and wear properties in low temperature operation.View full abstractDownload PDF (1695K) -
Yuichi ISHIKAWA, Kiyohiko UMEZAWA1982 Volume 48 Issue 7 Pages 866-872
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA pair of a straight line tooth profile internal gear and an approximated tooth profile mating pinion has been developed to provide easy manufacture of highly accurate internal gear. Already, it was clarified theoretically and experimentally that these internal gears could mesh each other with an allowable angular transmission error. In this paper, influences of the manufacturing errors and the mounting error of center distance on the tooth-to-tooth angular transmission accuracy of these internal gears are investigated by the numerical calculation and the experimental measurement. As a result, they are concluded that the manufacturing and mounting errors do not have much effect on the angular transmission accuracy, and that relatively broad tolerances are permitted in the manufacturings and mountings. Moreover, it is found that even if manufacturing errors exist in these internal gears, the resulting angular transmission errors can be reduced by intentionally mountings with adjusting the center distances.View full abstractDownload PDF (1146K) -
Jujiro KAGAMI, Kunio YAMADA, Tetsuzo HATAZAWA1982 Volume 48 Issue 7 Pages 873-880
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe contact mechanism between cylinders and rough planes is theoretically analysed for the mixed, the elastic and the plastic contacts of asperities. The analysis leads to the results that the surface roughness in contact is larger and the load acting between the contact surfaces is lower, the contact width and the approach between those surfaces are larger but the contact pressure lower, compared with the values calculated for the contact between smooth surfaces. It is also found that the difference between the calculated contact width and approach based on the mixed contact and those based on the elastic, the plastic contacts, is several tens per cent in the lower range of load. To confirm the analysed results the contact width between the cylinders and rough planes of carbon steel is measured by means of evaporated carbon and lump black films coated on the rough surfaces. The approach between the surfaces is also measured using the differential transformers and little difference is found between the analysed results and the experimental ones.View full abstractDownload PDF (1128K) -
Shizuichi HIGUCHI, Tadaaki HANAOKA1982 Volume 48 Issue 7 Pages 881-886
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIt is difficult to obtain the abrasive belt which height of each grain cutting edge is uniform, because of manufacturing process of abrasive belt. Moreover, wear and the density of active grains change conciderably with the advance of grinding time. So, the grinding force and the finished surface roughness change remarkably. In this paper, the change of thickness irregularity of abrasive belt and corresponding surface roughness were discussed in cylindrical plunge cut, in the case of varying grain size and rubber hardness of contact wheel. The obtained main results are as follows : (1) The relation between thickness irregularity and surface roughness with the advance of the grinding time could be shown as a curve. The curve could be classified into three regions, and the relation could be expressed by a straight line in every region. (2) Moreover, after taking into account the change of thickness distribution of abrasive belt, the ratio of active length was introduced. And so, the relation between ratio of active length and surface roughness could be expressed by a straight line.View full abstractDownload PDF (800K) -
Developmental Apparatus of Articulated Robot Arm with Two Degrees of FreedomYoshitsugu KAMIYA, Sakiichi OKABE, Yasuo YOKOYAMA1982 Volume 48 Issue 7 Pages 887-892
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSRecently many various industrial robots are developed and used to widely diverse operations. Especially the developments and the studies of the articulated robot arm are growing up rapidly, because the articulated robot arm has a wide working area and has many various configurations of its attitude. Considering the motion control of the articulated robot arm, the robot arm can take a different trajectory of its configuration from the nitial configuration to the final configuration for each control scheme of the robot arm. In this study, the minimum time control of the articulated robot arm with two degrees of freedom from the initial configuration to the final configuration is considered. The minimum time optimal control cannot generate a closed loop system, so the disturbance of the system or the misidentification of the parameters of the robot arm directly degrade the performance of the control. In this study, the authors propose the following control of the optimal path that is generated by the minimum time optimal control theory and show the results of following control of the optimal path by driving the developmental apparatus of the articulated robot arm with two degrees of freedom.View full abstractDownload PDF (888K) -
Considerations in Stability of Steady-state Impact MotionKunio KOIZUMI, Yasuo YOKOYAMA1982 Volume 48 Issue 7 Pages 893-898
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the stability on damped forced colliding vibration with one degree of freedom system, consists of a spring suspended impacter and a fixed rigid stop. Following problems are solved by a stability analysis based on a perturbation technique : It determines a stable gap region of actual impact motion within a setting gap range of the stop which is obtained by the steadystate conditions, chooses the alternative of the actual phase lag among its two values in the gap of the outside of forced vibration amplitude. It is also described on the characteristics of undamped impact motion at resonance and its stability in this report. Whatever gap is get up, the colliding velocity doesn't change. It is stable over the infinite gap range. The other results of this paper are as follows : The limit of the gap range agrees with the one side boundary of the stable region. There is the gap of the maximum velocity within the stable region. The phase lag with larger impact velocity causes stable motion in the gap of the outside of forced vibration amplitude. Over-all region of the setting gap is stable in the neutral type.View full abstractDownload PDF (879K) -
1982 Volume 48 Issue 7 Pages 898
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (134K) -
Hidehiko TAKEYAMA, Noboru IIJIMA, Kazuyuki UNO1982 Volume 48 Issue 7 Pages 899-905
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSSurface integrity, which is defined by the overall qualities of solid surface from topological, mechanical, physical, chemical and metallurgical standpoints, is generally influenced by the surface processings. In this study, the effect of the surface properties of WC-Co cemented carbide tools, which are determined by the grain size of the tool grinding diamond wheel, on their brittle fracture is investigated experimentally, and the fractographical analysis is done in order to clarify the mechanism of fatigue type of brittle fracture of cemented carbide subjected to the cyclic impact tests and the cutting tests. It is found by the intermittent turning test and the cyclic impact test that the tool life due to brittle fracture decreases with a decrease in the diamond grain size of the grinding wheel. The X-ray diffraction analysis shows that compressive residual stress is produced within the WC grains of the surface layer by grinding and the binder phase is plastically deformed or work-hardened. Both the absolute values of residual stress and the degree of work-hardening in the surface layer increase with an increase in the diamond grain size. The successive microscopic observation of cemented carbides with the progress of the cyclic impact tests reveals that plastic deformation in the binder phase is likely to initiate microcracks mostly in the grain boundaries. The initiation of microcracks is suppressed by work-hardening, and the propagation of microcracks is decelerated by compressive residual stress.View full abstractDownload PDF (1897K) -
A Study of Cutting Mechanism of Circular Cutting Edge Ball End Mill (3rd Report)Takeshi KISHINAMI, Hiroshi SUZUKI, Katsumasa SAITO1982 Volume 48 Issue 7 Pages 906-912
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe present paper deals with the experimental investigation for relationship between the cutting ability and cutting edge shape of Circular Cutting Edge Ball End Mill (so called C. E. B.). The cutting edge shape of C. E. B. is defined by two parameters α and β, where α and β are rake angle and setting angle of cutting edge respectively. In order to make various cutting edge shapes of C. E. B., the magnified C. E. B. model which consists of various cutting edges with various rake angle, and variable setting angle attachment, was designed and a working model was manufactured. Model cutting test, using a parafine workpiece, was performed to clarify the relationship between cutting edge shape and cutting force. From these experiments, two typical cutting edge shapes were found to give good cutting ability (cutting force, cutting operation angle and chip formation mechanism). These two cutting edge shapes are named C. E. B.-1 and C. E. B.-2, giving good cutting ability for up-cut and down-cut motions in threedimensional space respectively.View full abstractDownload PDF (3538K) -
WhoaSoo LEE, Yuji FURUKAWA1982 Volume 48 Issue 7 Pages 913-918
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe effects of stiffness upon either the elastic deformation between workpiece and grinding wheel, and the stability limit of self-excited vibration have been reported in detail so far. According to these, the grinding machine should be designed as stiff as possible in order to obtain more efficient and precise grinding. On the other hand, the stiffness of grinding machine has to be settled in an appropriate value both from the performance and the economical requirements in practice. The present study proposes the method to determine the stiffness of grinding machine for a use of rough operation, standing on the point to utilize the given spindle motor power fully, without any trouble from the both behaviors written above. Namely, the minimum value of static stiffness is first analyzed which can give an appropriate amount of elastic deformation even under the full cut condition. Secondly, the minimum value of dynamic stiffness, regarding mainly to the damping ratio, is analyzed which is enough to make the operations free from the chatter vibration even under the full cut condition.View full abstractDownload PDF (954K) -
Numerical Analyses of Cylindrical and Non-cylindrical WorkpiecesKazuhiro YOKOYAMA, Ryoichi ICHIMIYA1982 Volume 48 Issue 7 Pages 919-924
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper presents the finite element analyses of temperature distribution and thermal deformation of the workpiece. Cylinder, engine-cylinder with cooling fin and connecting rod are studied. In the case as honing with frequent passage of weak heat source, good accuracy of numerical calculation is obtained by use of the staying model of a heat source distributed over honing surface. Heat quantity flowing into the workpiece is about 98% of the heat generated in honing. In the cylindrical workpiece the thermal deformation of radius at honing surface is well assumed by the product of temperature increase at outer surface, coefficient of thermal expansion and radius at honing surface in every time and every condition of honing. In the case of engine-cylinder with unequal thickness along the axis, the thermal deformation affects upon the dimensional and geometrical accuracy, and the effect on cylindricity is about 30% of the effect on radius in the present analyses. In the case of connecting rod with unequal thickness along the angular position, the thermal deformation affects only upon the dimensional accuracy, and the effect on roundness is 5% of the effect on radius.View full abstractDownload PDF (1061K) -
On the Milled HelicoidMuneharu MOROZUMI, Satoshi KISHI1982 Volume 48 Issue 7 Pages 925-932
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn measurement of pitch diameter of screw thread by the three-wire method, it is necessary to keep the condition for single contact between the measuring cylinder and the thread flank of the groove. But in the case of the screw thread with small included angle and large lead angle, it becomes impossible to measure the pitch diameter, because of double contact between the cylinder and the flank. So a full and detailed consideration of the condition for single contact between the cylinder and the flank is necessary. This report deals with the limiting condition for single contact between the cylinder and the flank on the milled helicoid. A precise formula which determines whether the contact is single or double is derived by an analytical method. And the way to calculate the limit measuring wire diameter which avoids double contact is given. It is clarified that in most cases the danger of double contact on the milled helicoid does not exist through theory, numerical examples and experiments.View full abstractDownload PDF (1538K) -
Quantitative Examination of AE Signals Detected during Tool Breakage and Metal CuttingKazuaki IWATA, Toshimichi MORIWAKI, Hidefumi HASIMOTO, Toshiro SHIBASA ...1982 Volume 48 Issue 7 Pages 933-938
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn order to evaluate acoustic emission (AE) signals associated with cutting tool damages, series of fracture tests of carbides and ceramics are carried out. Experiments are also carried out to identify the causes and to evaluate the magnitudes of the AE signals generated during cutting, which are attributable to causes other than the tool damages. Linear relations on logarithmic scales are found from the fracture tests between the magnitude of AE signals and the cross sectional areas of fracture. These relations are not influenced by the loading speed, but the inclinations of the lines are dependent on the material properties. The results are consistent with those obtained by the tool damages during cutting. It is also found that the AE signals are detected due to brittle fracture of the work material during discontinuous chip formation and also due to collisions of the chips to the work and the tool. The levels of the signals are comparable to those due to the tool damages.View full abstractDownload PDF (1164K) -
Masaru UCHIYAMA, Kyojiro HAKOMORI1982 Volume 48 Issue 7 Pages 939-944
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe Laser Doppler Velocimeter (LDV) is known to have excellent spatial resolution and frequency characteristics. However, it is essentially a device for measuring velocity at a single point. It can not be used, without further development, for the measurement of velocity profiles in unsteady flows. In this study, a beam scanning LDV system in which the point of measurement is controlled by rotating mirrors is described. A prototype system has been constructed and tested. The use of a microcomputer to control the angles of the mirrors allows a high scan rate to be achieved. The time to measure a velocity profile is 0.13 seconds and the system can measure the profile of oscillatory flow up to the frequency of 0.12 Hz within the accuracy of 5%. The validity of the system has been assessed by comparing measured and theoretical results for the velocity profile in the damped oscillatory flow in a U-tube.View full abstractDownload PDF (807K) -
[in Japanese]1982 Volume 48 Issue 7 Pages 945-948
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (725K) -
[in Japanese], [in Japanese], [in Japanese]1982 Volume 48 Issue 7 Pages 949-952
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (723K) -
[in Japanese]1982 Volume 48 Issue 7 Pages 953-959
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1360K) -
[in Japanese]1982 Volume 48 Issue 7 Pages 960-963
Published: July 05, 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (643K)
- |<
- <
- 1
- >
- >|