巻号一覧
後続誌
48 巻, 10 号
選択された号の論文の20件中1～20を表示しています
- |<
- <
- 1
- >
- >|
-
中込 昌孝, 伊佐早 薫, 水野 正夫1982 年 48 巻 10 号 p. 1277-1283
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーIn 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.抄録全体を表示PDF形式でダウンロード (1153K) -
水兼 正博, 古川 勇二1982 年 48 巻 10 号 p. 1284-1290
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1345K) -
絞り特性および有効軸受面積の解析水本 洋, 松原 十三生, 久保 昌臣1982 年 48 巻 10 号 p. 1291-1296
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーTo 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.抄録全体を表示PDF形式でダウンロード (1436K) -
システム設計古川 正志, 嘉数 侑昇, 沖野 教郎1982 年 48 巻 10 号 p. 1297-1304
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThis 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.抄録全体を表示PDF形式でダウンロード (1129K) -
連接棒ボルトの応力解析萩原 正弥, 丸山 一男1982 年 48 巻 10 号 p. 1305-1310
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーStress 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.抄録全体を表示PDF形式でダウンロード (4272K) -
解析方法と初期欠損への適用上田 完次, 岩田 一明, 柴坂 敏郎, ジョーン パーシー1982 年 48 巻 10 号 p. 1311-1316
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーIn 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.抄録全体を表示PDF形式でダウンロード (4263K) -
柳 和久, 塚田 忠夫1982 年 48 巻 10 号 p. 1317-1323
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThis 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.抄録全体を表示PDF形式でダウンロード (1251K) -
隈部 淳一郎, 蜂須賀 勝1982 年 48 巻 10 号 p. 1324-1329
発行日: 1982年
公開日: 2010/02/16
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1330K) -
圧力波測定土屋 八郎, 井上 友一, 森 勇蔵, 井川 直哉1982 年 48 巻 10 号 p. 1330-1335
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThis 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.抄録全体を表示PDF形式でダウンロード (5392K) -
早乙女 辰男, 横井 文夫, 隈部 淳一郎1982 年 48 巻 10 号 p. 1336-1340
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーIn 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.抄録全体を表示PDF形式でダウンロード (3880K) -
自動調心機能をもつものの試作研究局 又太郎, 山本 晃1982 年 48 巻 10 号 p. 1341-1347
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーA 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.抄録全体を表示PDF形式でダウンロード (1342K) -
超硬合金の衝撃劣化試験機の試作と二, 三の試験結果白樫 高洋, 金沢 憲一, 井原 透, 臼井 英治1982 年 48 巻 10 号 p. 1348-1353
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1152K) -
前田 良昭, 山本 明, 樋口 英樹1982 年 48 巻 10 号 p. 1354-1360
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1157K) -
改良形直動玉軸受の寿命井沢 実, 清水 茂夫, 尾崎 正和1982 年 48 巻 10 号 p. 1361-1366
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリー現在市販されている呼び径30mm, 玉列数6の標準形直動玉軸受を用い, その外筒軌道面両端部に半径1.4mmの丸み部を加工して修正を施した改良形直動玉軸受を試作し, 総数59個の試料について寿命試験を実施した.結果を要約すると次のようである.
(1) 改良形直動玉軸受の寿命値は, 市販標準形直動玉軸受に比べて26%増大した.また, その基本動定格荷重の理論計算値と実験値はほぼ合致した.
(2) 改良形直動玉軸受の寿命分布状態は, 最小寿命を導入した3パラメータワイブル分布関数に極めてよく適合し, 100%の残存確率に対応する信頼度係数は, ほぼ0.4であることがわかった.抄録全体を表示PDF形式でダウンロード (5137K) -
清水 茂夫, 井沢 実1982 年 48 巻 10 号 p. 1367-1372
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリー直動玉軸受の外筒軌道面改良法について検討し, このような改良形直動玉軸受の基本動定格荷重を求める理論式をたてた.更に, 改良形直動玉軸受の数例について軸受内負荷分布の変動状態および基本動定格荷重値を計算し, 従前の軸受の場合と比較して検討を加えた.以上の結果を要約すると次の通りである.
(1) 軸受外筒の軌道面両端部に玉径以上の半径をもつ丸み部を設けると, 軸受内負荷分布の変動状態はかなり均一化され, 基本動定格荷重も増大してほぼ一定値になる.
(2) 外筒軌道面を中高になるようクラウニングを施した場合, 軸受に予圧を付与した場合と同様な効果が生じる.特に, 荷重偏心率が大きいところでは負荷分布状態の片当たり傾向を緩和し, 基本動定格荷重も10%近く増大できることがわかった.抄録全体を表示PDF形式でダウンロード (1029K) -
佐分利 敏雄, 稔野 宗次1982 年 48 巻 10 号 p. 1373-1378
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1400K) -
佐藤 壽芳1982 年 48 巻 10 号 p. 1379-1384
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1001K) -
真壁 肇1982 年 48 巻 10 号 p. 1385-1391
発行日: 1982年
公開日: 2010/02/16
ジャーナル フリー本稿では, 信頼性工学について, 筆者の目より見たときに, 近年重要視されていると考えられるトピックスをなるべく系統的にまとめてみた積りである.しかし, 紙数の関係で, 十分に尽くしているとはいえないし, また, ちょっとふりかえってみても, 第3, 4節の中に言及したことも説明の足りない点が少なくない.これらについては, 特にここにあげてある文献を参照されることを望みたい.抄録全体を表示PDF形式でダウンロード (1424K) -
津和 秀夫1982 年 48 巻 10 号 p. 1392-1393
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (191K) -
堀内 義和1982 年 48 巻 10 号 p. 1394-1395
発行日: 1982年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (542K)
- |<
- <
- 1
- >
- >|