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45 巻, 539 号
選択された号の論文の18件中1～18を表示しています
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丸山 弘志1979 年 45 巻 539 号 p. 1281-1285
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1503K) -
幾何誤差補正佐田 登志夫, 竹内 芳美, 平元 一之, 佐藤 真, 鈴木 博一1979 年 45 巻 539 号 p. 1286-1290
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThe study presents a method to improve the working accuracy of a numerically controlled machine tool by use of a minicomputer. The geometrical error of the machine tool is expressed as the polynominal of the third order of the coordinates from the measured data of the geometrical form of the master part fixed on the machine tool. Numerical control commands are modified on the basis of the general solution obtained in the study by the computer so as to compensate the geometrical error predicted by the error function. Experimental results by boring and end-milling on two different machining centers indicate the considerable improvement of the working accuracy.抄録全体を表示PDF形式でダウンロード (902K) -
斉藤 篤1979 年 45 巻 539 号 p. 1291-1296
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThe wear properties of copper-filled polyacetals (POM) have been studied with a thrust washer type testing apparatus under unlubricated condition. The effect of filler and fillergrading on the wear of copper-filled POM is investigated. The mechanism of wear is also discussed on the basis of optical and scanning electron microscopic examinations of the frictional surfaces. The results obtained are as follows :
(1) The wear of copper-filled POM is approximately one half of that of unfilled POM. The wear of copper-filled POM tends to decrease with the larger grading of copper at low pressure and velocity and with the smaller grading of copper at high pressure and velocity.
(2) The PV limit of copper-filled POM is higher than that of unfilled POM and increases with the smaller grading of copper.
(3) It was found that copper grains in the copper-filled POM support slider (opposite material) at the frictional surface for the most part. The effect increases with using larger copper grains as filler and leads to the reduction in the wear. At high pressure and velocity, however, the wear of large copper grains results in a heavy wear of copper grains because of the severe contact against slider.抄録全体を表示PDF形式でダウンロード (1099K) -
光扇を利用した測定法伊藤 紀男, 加藤 正1979 年 45 巻 539 号 p. 1297-1302
発行日: 1979/11/05
公開日: 2010/02/16
ジャーナル フリー本論文では物体上に直線的な形状が存在するとき, そのFraunhofer同折像がその直線に垂直な方向に扇状に広がる光扇を生じるという現象を利用して, 光学的に角度測定を行う方法について述べた.そしてこの測定法の基本的な問題の検討や測定誤差の要因などについて考察し, さらに簡単な測定装置による測定が行われた.その結果を要約すると次の通りである.
(1) 光扇を利用した角度測定法は, 2本の光扇が重なるような角度0°や180°近傍以外では, 比較的精度よく測定できる方法である.測定例では約20～160° (あるいは200～340°) の範囲の角度に対して, 投影器による測定値と0.5%以内で一致した.その反面, 上記以外の角度に対しては最大3%の誤差率をもった.
(2) 光扇像に影響を与えるような入射光に対する試料の傾きには二つの方向が考えられるが, その影響は5°の傾きに対して約0.4%の誤差を生じさせる.しかし, これらの傾きは常に傾きの小さい成分が大きい成分と相殺し合うという関係をもつ.抄録全体を表示PDF形式でダウンロード (910K) -
石川 憲一, 横山 恭男, 津和 秀夫1979 年 45 巻 539 号 p. 1303-1308
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーWhen soft polymers are cut by a blade such as various kinds of knives, the factors determinig cutting quality of the blade are divided into the following groups : (1) geometric factors, (2) dynamic factors, (3) metallurgic factors. In the present paper, the dynamic factor (2) is principally dealt with, employing adequate assumptions and approximation in regard to ordinary cutting of such materials. Reduction of effective edge angle and variance of cutting resistance in each direction are analyzed theoretically, since the frictional force has important significance in case of cutting. These theoretical results have been confirmed by experimental studies. And also, the cutting mechanism and cutting surface of materials with respect to edge radius of the blade, which depend upon factor (1), have been discussed by some photoplastic and other experiments, but factor (3) is not discussed here.抄録全体を表示PDF形式でダウンロード (1033K) -
寸法精度と工作物送り速度制御によるその向上柴田 順二, 伊藤 博, 稲崎 一郎, 米津 栄1979 年 45 巻 539 号 p. 1309-1314
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThe purpose of this paper is to investigate the characteristics of dimensional accuracy in contact-wheel surface belt grinding, and furthermore find out some effective techniques to achieve better sizing accuracy. The results obtained here are summarized as follows.
(1) The general characteristics on residual stock removal and dimensional accuracy, the latter is closely related to the former, can be understood by a model proposed here. The model is constructed basically depending on the elastic characteristics of the tool and its backup supports.
(2) Amount of residual stock removal ΔY is quite large and moreover the ratio of residual stock removal λR (=amount of residual stock removal/nominal depth of cut) is considered to be a function of grinding width as well as nominal depth of cut. The characteristics of ΔY and λR are the most important ones among the causes which deteriorate the dimensional accuracy.
(3) It is confirmed theoretically as well as experimentary that an adaptive control grinding proposed here, where work speed is changed so as to keep normal grinding force nearly constant, is considerably effective for improving the dimensional accuracy.抄録全体を表示PDF形式でダウンロード (897K) -
小坂 敏文, 高野 政晴1979 年 45 巻 539 号 p. 1315-1320
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーIn order to reduce the noise of machine, the method of the attenuation by an enclosure of the machine is usually adopted, which is easy to apply but costs fairly expensive. It is more efficient to reduce the noise if one takes some measures at the noise sources. Two different methods of the noise reduction are applied to a dot matrix printer, where the solenoid assembly is the dominant parts of the vibration excitation. One is to diminish the force of the collision of the dotting wire at the backstopper by decelerating the return motion of the wire, which reduces the noise about 3dB (A). The other is to isolate the vibration from solenoid assembly to headbody which has a large sound radiation surface. The vibration isolation effcct attributes to lowering the natural frequency of the spring-mass system under the prevailing frequency of the noise or vibration spectrum, and the result of reduction of total noise level by 6dB (A) is obtained.抄録全体を表示PDF形式でダウンロード (768K) -
三好 由記博1979 年 45 巻 539 号 p. 1321-1326
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the estimation and application of the mean square frequency and its root, by which the two variables, amplitude and frequency, of almost-periodic signals can be reduced to one variable and consequently the transition of nonstationary vibration signal can be grasped briefly, while the analysis with power spectrum density function is complicated. Firstly it is verified theoretically that a vibration signal can be expressed comprehensively by the mean square frequency and next that it can be expected simply by numerically calculating no more than second order autocorrelation function. As an application the roots of mean square frequencies of sound signal in turning operation which are functions of time are reported. The roots of mean square frequencies in the turning change remarkably at the time chatter begin or thereabouts and consequently it is revealed that the onsets of chatter vibration can be defined by using the mean square frequencies. The mean square frequency are very useful in experimental consideration for nonstationary vibration signal because the signal can be observed as a function of time alone while by nature as a function of amplitude, frequency and time.抄録全体を表示PDF形式でダウンロード (769K) -
中島 利勝, 露峯 登1979 年 45 巻 539 号 p. 1327-1333
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes the two plunge speeds grinding process, in which the plunge speed of wheel head is changed from the first higher speed into the second lower speed required for an expected grinding quality at a certain grinding time. It is made clear that the variation of grinding force in the two plunge speeds grinding is affected by the relation between the grinding force in the point of speed change and the steady force for the second plunge speed, and that the size generation process in the two plunge speeds griding is affected by the relation between the size generation rate in the point of speed change and the second effective plunge speed. It is then pointed out that the two plunge speeds grinding is not always more useful than the traditional plunge grinding from a point of view of grinding efficiency and quality, by analyzing the grinding efficiency under a given grinding allowance and quality.抄録全体を表示PDF形式でダウンロード (1082K) -
中ぐり加工中のラジアル回転精度の測定垣野 義昭, 水津 弘次, 石井 信雄1979 年 45 巻 539 号 p. 1334-1339
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーA new measuring method has been developed which can be applied to the measuring of the radial error motions of a rotating tool during boring. The measuring and cutting tests were conducted with a milling machine to compare the radial error motions of the rotating tool with those at the spindle noze, the out-of-roundness profiles of the machined bore and the dynamic characteristics of the tool-spindle. The following conclusions are obtained :
(1) Radial error motions of the rotating tool during boring are exactly measured by detecting the clearance between the master ball and the small metal tip installed on the boring bar.
(2) Cutting processes have only a small effect on the radial error motions of the rotating tool under such cutting conditions as those of the finishing of aluminum. On the other hand the dynamic characteristics of the rotating tool have a very large effect.抄録全体を表示PDF形式でダウンロード (902K) -
中心線平均粗さの多変量解析長谷川 素由1979 年 45 巻 539 号 p. 1340-1346
発行日: 1979/11/05
公開日: 2010/02/16
ジャーナル フリーThere are a lot of theories of ground surface roughness which have been considered by theoretical analysis. However, with so many variables influencing surface finish there is very little published information to contribute simplicity for users in the quantitative selection of grinding parameters. This paper deals with a statistical model for the center-line-average roughness of the ground surface of the steel (S 45 C). A 35-1 fractional factorial design is used to study the influence of the five independent parameters that is, the grain size, the feed velocity of the table, spark-out, dressing sparkout and dressing speed on the surface roughness. Response surface contours are constructed and it is shown these may enable the user to choose the grinding conditions for a given surface roughness.抄録全体を表示PDF形式でダウンロード (804K) -
江田 弘, 貴志 浩三, 大久保 昌典1979 年 45 巻 539 号 p. 1347-1352
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThe residual stress distribution of the ground surface layer, which may or may not contain secondary phase grains in the matrix, was microscopically analyzed by the finite element method. In this case, the dominating factors of the ground surface layer such as ratio of grinding force, grinding force, etc., were varied. The main results obtained were as follows :
(1) As the ratio of grinding force μ (=tangential force Ft/normal force Fn) is increased, the ground surface shows tensile residual stress on the ground surface and compressive residual stress in the next layer down.
(2) When the tangential force is small, the ground surface shows compressive residual stress on the ground surface layer and tensile residual stress in the next layer down.
(3) The ground surface layer, which contains secondary phase grains in the matrix, shows a remarkable increase of residual stress when directly under a direct grinding point.抄録全体を表示PDF形式でダウンロード (889K) -
検出のソフトウェア中沢 弘, 三好 由記博, 繁村 一義1979 年 45 巻 539 号 p. 1353-1358
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the developement of the simple and practical algorithms for exactly detecting onsets of chatter vibrations in process. The algorithms in this study, which judgements of onsets of chatter vibrations are based on detecting periodic components in signals such as sound or acceleration, are not influenced very much by changes of cutting conditions and its computation can be done in a short time, consequently they are successful for detecting chatter vibrations in process. By applying the algorithms to signals recorded in turning operations, following results were obtained. (1) Onsets of chatter vibrations can be detected from sound signals in cutting S 45 C and the correct results are obtained independently of changes of cutting conditions. (2) Acceleration signals are not suitable for the algorithms. (3) Applications of the algorithms to cases of machining of cast iron have hazard of yielding noticeable error in the judgement.抄録全体を表示PDF形式でダウンロード (767K) -
笹田 有功, 稲永 英和, 岡本 暘之助1979 年 45 巻 539 号 p. 1359-1363
発行日: 1979/11/05
公開日: 2010/02/16
ジャーナル フリー粘弾性材料の薄板は圧延, 押出し等の製法のため, そりを持つ.そりは測定力に関して, 接触不良誤差と圧縮変形誤差に対し, 相反する要因になる.材料の変形特性を利用して, 厚さを精度高く測定する方法を提案した.
実験の結果は次のように要約できる.
(1) 被測定物の材料の変形を線形変形モデルに従うとし, そりをクリープで除き, クリープのために加えた測定力を除いた時に得られる弾性回復量を補正することによって, 精度の高い厚さを測定することができる.
(2) 測定力附加機構に上皿天びんを用いることによって, 安定した測定力が得られた.測定力を除去したときの弾性回復量を求めるために残された補助接触力は0.005N/cm2とした.補助接触力による誤差は無視できる量であった.
(3) 本実験で得られた測定精度は標準偏差で±2μm程度と推定された.これは従来から用いられているマイクロメータによる測定精度より良好であると推定される.抄録全体を表示PDF形式でダウンロード (883K) -
林 巌, 林 輝1979 年 45 巻 539 号 p. 1364-1369
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーSome aspects of the vibration with tooth separation due to a steplike pitch error, which is the extreme one of the various pitch errors, are studied experimentally and theoretically on the spur gears on which the light load is applied and which are used at a low rotational speed. And it is tried to estimate the chracteristics of the steplike pitch error and the amplitude of the vibration with tooth separation with the use of a method of error vector diagram. In addition a pitch error like a sine wave is studied theoretically with the help of the results obtained on the steplike pitch error. Thus the followings are obtained.
(1) The vibration with tooth separation, which grows as the rotational speed, appears at a steep increasing slope of the steplike pitch error. And the one which does not grow appears at a steep decreasing slope. These vibrations are equivalent to those due to a relative tooth profile error like a saw tooth wave.
(2) The method of error vector diagram, which was obtained from the studies on the relative tooth profile error, can be applied on the steplike pitch error. The amplitude of the vibration with tooth separation due to the steplike pitch error can be estimated with the use of this method.
It is necessary to study on the pitch error which varies irregularly every teeth, because the method of error vector diagram cannot be applied on the irregular pitch error.抄録全体を表示PDF形式でダウンロード (959K) -
断続切削時における食いつきの研究 (第1報)山本 明, 中村 示, 外山 和巳, 河村 一郎1979 年 45 巻 539 号 p. 1370-1375
発行日: 1979/11/05
公開日: 2010/02/16
ジャーナル フリーIn this paper, the stresses distribution are analyzed upon the tool-chip contact surface at the transient cutting process of orthogonal cutting by the photo-elastic experimental method, in which the lead plates are cut with a tool of epoxy resin. The main results are as follows. When a rake angle α≥0°, the shear stress upon a rake surface maintains a constant value within a limit from the pointed cutting edge of tool and drops rapidly to zero after that. However, when α<0°, that stress becomes to zero at the pointed end, increases gradually to the biting point on the rake surface, maintains the maximum value in a range, and drops rapidly to zero since then. On the other hand, the normal stress becomes always to the maximum value at the pointed end tool, and decreases gradually toward the chip separating point. Morever, these stresses distribution curves change nearly to like figures from biting time to the regular cutting. Furthermore, as the results of assuming model of these stresses distribution curves are applied to the prediction of cutting force, that predicting cutting force comparative well concurs with a practical value, and the cutting force at the transient cutting process undergoes a chage like an exponential function.抄録全体を表示PDF形式でダウンロード (789K) -
石榑 顕吉1979 年 45 巻 539 号 p. 1376-1383
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1189K) -
垣野 義昭, 杉浦 守彦, 安井 武司, 高田 孝次, 沢辺 雅二1979 年 45 巻 539 号 p. 1384-1387
発行日: 1979/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (520K)
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