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Volume 48, Issue 10
Displaying 1-20 of 20 articles from this issue
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Masataka NAKAGOME, Kaoru ISAHAYA, Masao MIZUNO1982 Volume 48 Issue 10 Pages 1277-1283
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, the effects of the clamping force and the pre-clamping force on the fatigue strength for the M 4 rolled-bolts were described theoretically and experimentally. The important items obtained in this paper were listed as follows. (1) The experimental value of the fatigue limit for the optimum clamping force in this paper increased about 43% as compared with the fatigue limit for the conventional clamping force, at the mean stress σm=33 kgf/mm2. (2) In the case of the test bolts it can be made a rough estimate of the optimum clamping force by the theoretical value of n''= 1/2. (3) The experimental value of the fatigue limit for the optimum clamping force after the pre-clamping increased about 10% as compared with the fatigue limit for the optimum clamping force. (4) The reasons for the improvement of the fatigue limits with the pre-setting to the rolled-bolts were not only the residual stress arising at the root bottoms of thread and the work hardening but also the effects of the optimum clamping force after the pre-clamping.View full abstractDownload PDF (1153K) -
Masahiro MIZUKANE, Yuji FURUKAWA1982 Volume 48 Issue 10 Pages 1284-1290
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe solid friction which works at the sliding faces or the joint of lead screw with nut contributes to the improvement of the dynamic stiffness of NC feed drive system, but disturbs its positioning performance. On the other hand, the system gain and the servo stiffness, the former governs the frequency response and the latter does the static stiffness of the NC driven slider, are decided mainly by the velocity and the positioning control amplifier gains, KA and KN respectively. The increasement of both KA and KN improves the positioning performance, but decreases the servo stability. Taking these points into consideration, the present paper has made the design procedure of NC feed drive system clear which could match the mechanical characteristics with the electrical properties in such a way as to satisfy the required specifications and has proved the results by the experiments.View full abstractDownload PDF (1345K) -
Hydraulic Resistance of Restrictor and Virtual Bearing Area of FlankHiroshi MIZUMOTO, Tomio MATSUBARA, Masaomi KUBO1982 Volume 48 Issue 10 Pages 1291-1296
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSTo facilitate the manufacture of hydrostatic lead screws, a new type of oil pocket is designed; instead of the conventional rectangular recesses, a series of oil supply holes arranged on the flank of the female screw are designed to have the function of oil pockets. It is relatively easy to make pockets of such type, because the holes can be bored from the outside of the nut. The flow restriction system is also designed to facilitate manufacture;on the outer cylinder surface of the nut, a wide shallow groove is cut to surround the oil supply holes, and when the nut is inserted into a sleeve by shrinkage fit, the gap between the shallow groove of the nut and the inside of the sleeve functions as a flow restrictor for each oil supply hole. From the experiments and the numerical analyses using the Finite Element Method, it is shown that the newly designed flow restrictor can be regarded as a kind of capillary restrictor, and the virtual bearing area of the improved hydrostatic lead screw can be larger than that of conventional hydrostatic lead screws.View full abstractDownload PDF (1436K) -
System DesigningMasashi FURUKAWA, Yukinori KAKAZU, Norio OKINO1982 Volume 48 Issue 10 Pages 1297-1304
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper reports on the designing of a software system for computer-aided sheet metal manufacturing. The developed system is designed to be used with a small (128 kilo-bites) computer, and it aims at realizing highly-automated punching-press and shearing processes in sheet metal manufacturing. The system consists of five processors, each of which possesses the following functions : translating input data language and producing standardized data files for subsequent processors, nesting products onto raw sheet metal blanks, determining the shear-scheduling of the products to be cut rom the raw sheet metal blanks, sorting out punching-press geometries to assign each ones to a proper task group, and determining a punchingpress tool path. The language designed for the system has information on the raw sheet metal blanks, products, and punching-press tasks. In the shearing process, it is extremely difficult to automate product allocation onto the raw sheet metal blanks. In order to solve this difficulty, a method developed for the trim problem is adopted for this system. Decision making in shear scheduling, tool path generation for punching-press, and punchingpress geometry sorting are mathematically modeled, and methods are developed to solve these models. The developed software system may raise an important role in realizing an integrated sheet metal manufacturing system.View full abstractDownload PDF (1129K) -
Stress Analysis of Connecting Rod BoltsMasaya HAGIWARA, Kazuo MARUYAMA1982 Volume 48 Issue 10 Pages 1305-1310
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSStress analysis of the connecting rod bolt is performed as the first step for the establishment of the strength design system for the general bolted joints. In the analysis, the connecting rod is replaced by the ring, and the stress of the bolt is calculated from the displacements of the local points in the ring. Furthermore, the deformation of the connecting rod and the stress of the bolt are measured for the comparison with the result of the analysis by using the above mentioned model. The results obtained from this study are as follows : (1) The simplified method of stress analysis in which the connecting rod is replaced by the ring is presented. (2) The calculating values by the above method show a good agreement with the experimental results on the deformation of the connecting rod and the stress of the bolt. (3) The strength design of the bolted joints can be considerably simply performed by using the method presented in this study, but the establishment of the model for analysis is a difficult problem from the standpoint of systematization.View full abstractDownload PDF (4272K) -
Basic Concept of Fracture Mechanics Application and the Analysis of Early Fracture in Interrupted CuttingKanji UEDA, Kazuaki IWATA, Toshiro SHIBASAKA, John H. PERCY1982 Volume 48 Issue 10 Pages 1311-1316
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the first part of the paper the basic concept is described of the application of fracture mechanics theory to the brittle failure of cutting tools and a systematic algorithm for its application is proposed. In the second part of the paper a case study is presented for the early fracture in interrupted cutting. From the analysis the boundary curve between safe and dangerous zones for the early fracture is determined in terms of the cutting conditions, the tool geometry, the mechanical properties and the fracture toughness of tool materials. The dangerous zone increases as the fracture toughness value decreases and the wedge angle decreases. The zone also increases with a decrease in the ratio of vertical component to horizontal component of the resultant cutting force. The boundary is largely affected by the pattern of the contact between the work and the cutting edge in initial stage of cutting, and the most dangerous situation is found when the tip of the cutting edge contacts the end surface of the work.View full abstractDownload PDF (4263K) -
Kazuhisa YANAGI, Tadao TSUKADA1982 Volume 48 Issue 10 Pages 1317-1323
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper describes the theoretical analysis of thermal contact resistance at the interface of two isotropic rough surfaces. Through the comparison between the analytical results and the experimental ones, the following conclusions were drawn. (1) The present contact theory taking account of both elastic and plastic asperity deformation, and the equilibrium condition of heat flow through the entire contact area are adequate to analyse the thermal contact resistance quantitatively. (2) The thermal contact resistance by the isotropic surface roughness is lower than that by the unidirectional one. (3) The thermal contact resistance increases with the increasing surface roughness height. However, the ratio of surface roughness of two contacting bodies has little influence on it. (4) The thermal contact resistance decreases with an increase in the contact pressure, and it is marked when the thermal conductivity of the interstitial material is relatively low.View full abstractDownload PDF (1251K) -
Jun-ichiro KUMABE, Masaru HACHISUKA1982 Volume 48 Issue 10 Pages 1324-1329
Published: 1982
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe purpose of this study is an invention of theory and technics on roundness≈0 machining, turning for a precise circle. The possibility of this high accuracy cylindrical machining is analyzed according to the principle of making a precise circle. In this study, the method of chucking-type precision cylindrical machining can be created by combining the insensitive vibration cutting mechanism, the main spindle system with the air bearing and the superposition superfinishing. The concrete methods are as follows : In the first process, the work which is chucked on the main spindle with air bearing is machined as acting a continuously and systematically pulsation cutting force by the ultrasonic vibration cutting mechanism. In the following process, the work is finished by the newly developed superposition superfinishing device by using equivalent grade characteristics of ultrasonic vibration stone. Key points of the technics are as follows : The one is a contrivance of torsional vibration mode tool for making an accurate and high amplitude vibration mode of cutting point, the other is a contrivance for making accurate motions of the superposition super finishing device. After all, to actualize machining roundness of 0. 1-0. 2 μm, surface roughness of 0. 03- 0. 09 μm are succeeded in work material of carbon steel, stainless steel and hardened steel (HRC 41, 53, 60). Therefore, it is considered that a roundness≈0, cylindricity≈0 and surface roughness≈0 high precision turning can be realized by means of this new machining process and its lathe.View full abstractDownload PDF (1330K) -
Measurement of Pressure WaveHachiro TSUCHIYA, Tomoichi INOUE, Yuzo MORI, Naoya IKAWA1982 Volume 48 Issue 10 Pages 1330-1335
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the measurement of pressure wave produced by spark discharge in liquid. First, based on the analysis of the pressure field, the desirable configuration of the end surface of the pressure measuring device is discussed. The analysis shows that the configuration has remarkable effects on the results of the measurement of the pressure wave. The device is designed to have the suitable accuracy of the pressure measurement. Secondly, the pressure waves in different liquids of tap water and 0.1% NaCl solution are measured accurately under the conditions of various electrode gap distance. The results obtained are as follows : (1) The measuring device is to have a large additional flat surrounding the end surface of the pressure measuring bar for better measurement. The radius of the end surface of the device is to be larger than the length of the pressure wave. (2) With an increase of the electrode gap distance, the maximum value of the pressure increases in one hand and the time to reach the maximum de- creases in other hand. (3) The maximum value of the pressure in tap water is larger thanthat in 0.1% NaCl solution.View full abstractDownload PDF (5392K) -
Tatuo SOTOME, Fumio YOKOI, Junichiro KUMABE1982 Volume 48 Issue 10 Pages 1336-1340
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this report, it is analyzed that vibration cutting is a suitable process for internal screw threading of thin cylindrical stainless steel and a new precisionvibration internal threading lathe is created. Experiments are carried out by means of this lathe to investigate the tool life, chip type, accuracy of machined thread screw, etc. The main results obtained by experiments are as follows. (1) The chips formed by this vibration cutting are unoxidized flow type chips whity-grey coloured. (2) The smooth machined flank surface, on which iridescent surface is generated, is produced, (3) Expected sharp profile of internal thread can be machined. (4) The relation between tool wear and cutting length is investigated. (5) By this process and lathe, it is possible to thread for 10 000 pieces perone tool, that is, the tool life extends about 200 times compaired with 40-50 pieces in conventional cutting. This new vibration internal threading machine is using on mass production tests and said results are confirmed on about 500 000 pieces work.View full abstractDownload PDF (3880K) -
Trial Manufacture and Research of Hydrostatic Lead Screw Having Self-centering AbilityMatataro TSUBONE, Akira YAMAMOTO1982 Volume 48 Issue 10 Pages 1341-1347
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA hydrostatic lead screw and nut where 4-sector-shaped recesses of radial flow type were arranged in thread flanks of the nut in order to be possessed of self-centering ability, was manufactured on trial. Theoretical analysis and experiments for one side and both side pressure mode hydrostatic lead screws and a screw cutting test using the hydrostatic lead screw and nut were also performed. The main results are as follows : (1) The formulae to calculate the statical stiffness of a both side pressure mode hydrostatic lead screw is derived from ones for a hydrostatic thrust bearing presented in the previous report by a suitable transformation. (2) The hydrostatic lead screw and nut manufactured on trial shows good self-centering ability. (3) The experimental value of statical stiffness is 38 N/μm, while the theoretical one is 59. 2 N/μm. It is considered that the reason of this difference arises from the back pressure remaining at the thread flank behind the active one. (4) The screw cutting test shows that the statical stiffness of this hydrostatic lead screw is sufficient so far as the finish cutting is concerned.View full abstractDownload PDF (1342K) -
Impact Deterioration Test and Its Some Results for Carbide Tool MaterialTakahiro SHIRAKASHI, Kenichi KANAZAWA, Tohru IHARA, Eiji USUI1982 Volume 48 Issue 10 Pages 1348-1353
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe paper describes a method for obtaining the behavior of fracture characteristics of carbide tool materials under such conditions that are encountered in interrupted turning operation. For this purpose, the impact tension and the impact compression loading testing machines are designed, in which a control of loading rate or a rising time of load as well as applied stresses and cycles is arbitrarily possible. The results obtained for carbide materials, K 20, P 20, under roomtemperature are summarized as follows : (1) The fracture characteristics of carbide materials, considered as extremely brittle materials, are also deteriorated like a fatigue seen in a ductile material by cyclic loading. They have the feature that the fracture stresses decrease and the scatter of them increase, while the maximum fracture stress changes little in Weibull's distributions. (2) The deterioration rate greatly depend on the loading rate. The impact loading give the larger deterioration than the static one or the slow loading rate even under thesame stress and cyclic number. (3) The threshold stresses are found in both impact tension and compression deteriolation stresses. The impact stresses below this threshold one never give any deterioration in tool material even in the increase of cyclic number of load.View full abstractDownload PDF (1152K) -
Flank Wear in Interrupted Cutting Accompanied with Rotational Speed Vibration of Main Spindle SystemYoshiaki MAEDA, Akira YAMAMOTO, Hideki HIGUCHI1982 Volume 48 Issue 10 Pages 1354-1360
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe tool wear in interrupted cutting has been investigated from various points of view. In this study, for cases accompanied with the torsional vibration of themain spindle system, hitherto undiscussed, some aspects of the flank wear are examined. From two-dimensional interrupted turning experiments, using the apparatus and the technique newly developed for this study, the following results were obtained. (1) The flank wear is directly influenced by the interrupted cutting variables : frequency of interruption n0, interrupted cutting ratio β, amplitude of cutting force Fc, and amplitude of rotational speed vibration dΩ. But the influence of cutting edge temperature θ was not observedin these experiments. (2) Under comparatively low wear condition such as examined in this study, the increment of the volumetric wear is approximately proportional to the amplitude of the rotational speed vibration and the other variables above mentioned. From these experimental results, a description of the volumetricwear by the above interrupted cutting variables is attempted, and a wear equation can be identified with sufficient accuracy.View full abstractDownload PDF (1157K) -
On Reformed Type BearingMinoru IZAWA, Shigeo SHIMIZU, Masakazu OZAKI1982 Volume 48 Issue 10 Pages 1361-1366
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThis paper deals with the fatigue life distribution, basic dynamic load rating and the reliability factor of a reformed type linear motion ball bearing. The trial productions of the bearing, which. are made use of commercial type standard bearings (nominal diameter = 30 mm and number of ball rows= 6), are performed. Both end portions of outer sleeve raceway surfaces of the bearing are reformed and rounded out by 1.4 mm radii so as to improve the bearing lives. The following is a summary of the results : (1) The life values of the reformed type bearing are increased by 26% in comparison with those of the commercial type bearing. The experimental value of the basic dynamic load rating of the reformed type bearing almost agree with the theoretical one. (2) The life distribution state of the 59 bearings conforms very well to the three parameters Weibull distribution function in which a minimum life is introduced. Consequently, reliability factors can be decided clearly almost all over the failure regions. In addition, it is found that its value on 100% reliability nearly equals to 0.4.View full abstractDownload PDF (5137K) -
Shigeo SHIMIZU, Minoru IZAWA1982 Volume 48 Issue 10 Pages 1367-1372
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn this paper, the method of reformation in relation to the outer sleeve racewaysurfaces of a linear motion ball bearing is examined and its basic dynamic load rating formula is derived. Some points are discussed concerning the calculated results for the fluctuated states of load distribution and the basic dynamic loadrating of the bearing. Principal results are as follows : (1) If both end portions of the outer sleeve raceway surfaces of the bearing are rounded out with a proper radius such as the greater radius than the used ball diameter, the fluctuated states of load distribution become uniform, and the basic dynamic load rating is increased and converged to a constant. (2) If the outer sleeve raceway surfaces are made convex crowning into circular arcs in a longitudinal section, the side contact trends of the load distribution state are decreased considerably, andthe basic dynamic load rating is also increased.View full abstractDownload PDF (1029K) -
[in Japanese], [in Japanese]1982 Volume 48 Issue 10 Pages 1373-1378
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1400K) -
[in Japanese]1982 Volume 48 Issue 10 Pages 1379-1384
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1001K) -
[in Japanese]1982 Volume 48 Issue 10 Pages 1385-1391
Published: 1982
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESS -
[in Japanese]1982 Volume 48 Issue 10 Pages 1392-1393
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (191K) -
[in Japanese]1982 Volume 48 Issue 10 Pages 1394-1395
Published: 1982
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (542K)
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