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Volume 39, Issue 461
Displaying 1-14 of 14 articles from this issue
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[in Japanese]1973 Volume 39 Issue 461 Pages 558-562
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1088K) -
Study on the Belt Grinding (1st Report)Motoo NAKASHIMA, Mamoru IDO1973 Volume 39 Issue 461 Pages 563-568
Published: June 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIn this paper, the new method is investigated to measure the tension acting upon the belt by means of detecting the electric signals from a strain gauge pasted on the inside of belt. As the strain gauge comes into contact with contact wheel, the information transmitted from the strain gauge gives possibility to analyze many grinding phenomena such as over cut, grinding performance, etc. The values of belt tension (Pδ), which are measured with this method, are used for calculation of over cut as an example and the results of this calculation are compared with the experimental values.
The main results are as follows.
(1) The smaller the initial tension is, the larger the over cut becomes in the grinding condition of same rubber hardness. In the case of same initial tension, the over cut increases as the rubber hardness decreases.
(2) The over cut increases with the increasing of contact wheel velocity. Moreover, using the variety of belt tension (Pδ), it may be possible to analyze the grinding abilities for the serrated contact wheels.View full abstractDownload PDF (976K) -
Effect of Shape Characteristics of Control ValveShinobu KATO, Katsumi YAMAGUCHI, Etsuo MARUI1973 Volume 39 Issue 461 Pages 569-575
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSOn the hydraulic copying control device using the throttle valve, the effect of shapes and dimensions of the control ports on the working characteristics of the control device is examined quantitatively.
As a result, it has been shown that
(1) the response characteristics are uniquely determined by the momentum which is fed to the piston by the moving force due to the pressure drop in low-pressure chamber, regardless to the shape of the port or working condition; and
(2) in the case of the rectangular port, the optimum width of the port can be determined to obtain the most favourable response, and it depends closely on the dimensions of the control device and the working condition; and
(3) the indicial response of control device in the case of circular port is improved when the ports of throttle valve having larger radius are used, and the more the numbers of the ports are, the better the response of the device is.View full abstractDownload PDF (1042K) -
Experimental Study on Metal Cutting under Jet Flow (3rd Report)Toshiro IKUTA, Hideo TSUWA1973 Volume 39 Issue 461 Pages 576-583
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the cutting operations which are jetted the active gases for the cutting point of medium carbon steel S43C (JIS) from the direction along the side rake face, the chips are easily curled in certain cutting conditions. And so, this paper describes the results of an investigation into the better conditions of jet and causes for the chip curl from the experiments of aerodynamics and the cutting tests under various gas jets and high pressure of various gases. The main results obtained are as follows :
(1) For the better conditions of jet, it is found that the better distance between the side cutting edge and the nozzle measured on the rake face should be decided approximately 9 mm, and the better jet angle should be selected within the range of angles for the horizontal jet angle θh=0°20° and the vertical jet angle θv=0°6° on the rake face.
(2) The chips are not curled in the metal cutting under the high pressure of gases (A r, N2, Air and a mixture of 50% each of O2 and N2), because the chips are cooled and the jet pressure on the chip surface under gas jets are produced little under high pressure of these gases. But, the chips are curled under high pressure of CO2, because the necessary conditions to curl the chip are sufficiently satisfied by the environment of CO2 and its pressure.
(3) The experimental equations to determine the critical cutting speed under which the chips curl are obtained from the chips which are made in the cutting operations under various gas jets.View full abstractDownload PDF (2029K) -
Study on Buffer Storage in Production Line Systems (1st Report)Kenjiro OKAMURA, Hajime YAMASHINA, Masahiro SAKAMOTO1973 Volume 39 Issue 461 Pages 584-589
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe utilization of automatic transfer lines associated with high volume production is a common characteristic of machine industry. By linking of the stages of an automatic transfer line, the efficiency of it is decreased significantly compared with a single machine. It can be improved by providing buffer stores between the stages. A new specific method by a markov process for analyzing the effect of buffer stocks on automatic transfer lines is reported.View full abstractDownload PDF (925K) -
Analysis of Work Hardened LayerKenjiro OKAMURA, Toshikatsu NAKAJIMA, Yoshiyuki UNO1973 Volume 39 Issue 461 Pages 590-595
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn machining with cutting edges in periphery of a multi-cutting edge tool, the machined surface is generated by repeat of the transitional cutting process. In other words, the machined surface is generated in the transitional cutting process by the beginning part of contact between a cutting edge and workpiece. Surface integrity in the transitional cutting process should, therefore, be analyzed, recognizing the phenomena near the beginning point of the contact.
In this paper, from this point of view the work hardened layer has been analyzed in the transitional cutting process theoretically and experimentally.
First, the work hardening coefficient, a fundamental value on analyzing the depth of work hardened layer, is experimentally measured, and the influences of machining conditions on the coefficient are investigated. Then, the generation curve of the work hardened layer is determined by the work hardening coefficient, and the maximum depth of work hardened layer is theoretically analyzed.
Further, the influences of machining conditions on the maximum depth of work hardened layer are investigated experimentally, and it is indicated that the experimental results coincide with the theoretical one.View full abstractDownload PDF (889K) -
An Estimating Method of the Facility of Chip excluding with AirKiyoshi MINATO, Toshio TESHIMA, Yoshiaki KAKINO1973 Volume 39 Issue 461 Pages 596-601
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSAn estimating method of the facility of chip-excluding is proposed, and this method is applied to the case of chip-absorbing with air. The following results are obtained from this study :
(1) The facility of chip-absorbing with air (time necessary for absorbing a unit volume of chip or the ratio between the weight of absorbed chip and that of total produced chip) is estimated quantitatively by the following “shape coefficient of chip CR” which consists of terms of the maximum length of a chip L (mm), the weight of a chip W (g) and the volumetric coefficient R
CR= L+ 17.47 W+4.18 R
(2) The capacity of chip-excluding machine, suitability of cutting conditions, etc. can be quantitatively estimated by “shape coefficient of chip CR.”View full abstractDownload PDF (1924K) -
Kijuro NAKAMURA, Mikio MORIOKA, Takeshi YANAGISAWA1973 Volume 39 Issue 461 Pages 602-607
Published: June 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA reverberation device is developed using coiled springs, which would be desirable for an electronic organ to add smooth reverberant sound to the musical tone. But it has its faults; (1) difference in loudness at every key, (2) pulsating sensation immediately after depressing the key, (3) similar sensation in the transient after releasing the key, and (4) appreciable change of the frequency in the same transient.
Experiments show that (1) the free torsional vibrations build up when the key is depressed and also when the key is released, (2) there is some difference between the frequency of the free vibration and excitation frequency of the musical tone of the key, and (3) the intensity of the free vibration of the key depends on the difference.
This paper describes that these free vibrations are the cause of the four faults.View full abstractDownload PDF (1405K) -
Takeshi TANAKA, Naoya IKAWA1973 Volume 39 Issue 461 Pages 608-612
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe wear mechanism of the diamond grain in grinding is discussed with emphasis on the case of grinding mild steel. The simulated grinding test with single-grit technique makes it possible to evaluate quantitatively the wear of diamond for various materials and the anisotropy in the wear. The following conclusions are obtained by comparing the amount of wear in the grinding with that of erosion in diffusion test.
Diffusion of carbon is also observed in carbon steels (0.25% and 0.55%) and the carbon film over the surface of contact in diamond. With the grinding test, it is shown that the greater wear is observed in the <110> directions than in <100> on the {100} planes of the diamond cutting point in combination with the steel workpiece of the lower carbon steel. The results in grinding test agree with the estimation by calculation for the diffusion and the graphitization of diamond. In grinding mild steel, the wear mechanism of the diamond grain is fundamentally the same as that in the case of iron, then the effective application of diamond wheels to mild steel will be achieved by controlling the thermal conditions of grinding.View full abstractDownload PDF (953K) -
Practical Development of Jet Infusion of Grinding FluidsKozo KISHI, Hiroshi EDA1973 Volume 39 Issue 461 Pages 613-619
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSWith grinding fluid is a high jet pressure, heat quantity that its flow carry away increases. Therefore, to get fundamental information of practical development on grinding operation for difficult material to be cut by jet infusion of grinding fluids, effect of jet pressure is discussed by measurement values of grinding force, grinding temperature, residual stress, loading and concaveness of ground surface. The main results are as follows;
(1) The jet infusion of tangential direction of grinding point is most effective for the reduction of grinding temperature, residual stress and concaveness of ground surface.
(2) For improvement of thermal dominating factors in grinding accuracies, the dilution water of No. 1-No. 4 grinding fluids are more effective than group of #60 spindle oil.
(3) The prevention of loading of grinding wheel becomes effective as high jet pressure. For example, the jet infusion in high pressure takes a way the loading of adhesive type.
(4) The grinding temperature and conduction zone of it were dominated by a changes in the jet infusion pressure Pj.View full abstractDownload PDF (1516K) -
Tadasi KODAMA, Ichizo NAKANO1973 Volume 39 Issue 461 Pages 620-625
Published: June 05, 1973
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe spring clutches are widely used in the teleprinters and the input-output equipments in which the high-speed start-stop performances are required. In order to clarify (or improve) the dynamic characteristic of these equipments, it is necessary to understand the torque transmission characteristics of the spring clutches which have the hysteresis characteristic by the friction-loss. Therefore, this paper discussed about the distribution of gripping force by helical coil spring, distribution of the elongation of the spring wire and torque transmission in forward or backward rotation, in consideration of the friction between the spring wire and drum of the spring clutch. As the result of this analysis the simple expressions for the hysteresis characteristic of the torque transmission are obtained. And, it is made sure that these expressions agree with the measurements of the static characteristics of torque transmission.View full abstractDownload PDF (934K) -
[in Japanese], [in Japanese], [in Japanese]1973 Volume 39 Issue 461 Pages 626-633
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1871K) -
[in Japanese], [in Japanese], [in Japanese]1973 Volume 39 Issue 461 Pages 634-640
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESS -
[in Japanese], [in Japanese], [in Japanese]1973 Volume 39 Issue 461 Pages 641-647
Published: June 05, 1973
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1456K)
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