巻号一覧
後続誌
43 巻, 516 号
選択された号の論文の13件中1～13を表示しています
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木地 和夫, 伊藤 英俊, 遠藤 宣夫1977 年 43 巻 516 号 p. 1376-1381
発行日: 1977/12/05
公開日: 2010/01/20
ジャーナル フリーPDF形式でダウンロード (2026K) -
定常摩耗の解析に関する実験的検討 (銅の場合)鏡 重次郎, 山田 国男, 武田 信男, 直井 貞司1977 年 43 巻 516 号 p. 1382-1388
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーThe experimental investigations were carried out with copper in regard to the results of theoretical analysis of steady wear which were introduced in 5th report. The main results obtained are as follows :
(1) In relatively low range of sliding velocity, wears were nearly proportional to sliding time, but increased abruptly in higher range.
(2) The wear rates Vl were minimized at critical sliding velocity vc and the relation between Vl and v agreed qualitatively with the results of theoretical analysis in 5th report. Assuming the activation energy Δf to be 25 kcal/mol, calculated value of vc was relatively close to that obtained experimentally.
(3) In this experiment, it was observed that at the end of initial wear the wear volumes per unit time of sliding considerably decreased and the inflection points appeared on the cumulative wear curves at this time.抄録全体を表示PDF形式でダウンロード (1335K) -
変形挙動と押込み深さの関係堀井 健, 友田 泰行, 山田 朝治1977 年 43 巻 516 号 p. 1389-1394
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリー以上の結果をまとめると次のようになる.
(1) 平均接触圧力, 降伏応力比および弾塑性限界等の理論値が実験結果とよく一致するのは, 代表ひずみを導入した点にあり, 2次元圧子押込み解析の基本仮定は3次元の場合にも成立する.
(2) 圧子角が90~150°の範囲において代表ひずみの実験値と理論値とは一致した.
(3) 平均接触圧力の大部分は圧痕の極く近傍の変形抗力に依存する.
(4) 素地材料がめっき膜を有する場合の押込み変形はめっき膜内のみの変形過程から, 境界における流動変形の阻害の過程を経て, 押込みの進行とともに素地材料にまで及び, ついには両者の変形領域が一体となって流動を生じるという段階的な変形過程を示し, 理論上想定した押込み変形挙動に一致した.実験で得た各stageと押込み深さの関係は理論的傾向に一致した.抄録全体を表示PDF形式でダウンロード (1485K) -
テープの摩擦特性と研摩性三好 和寿, 田中 久一郎, 不破 良雄, 村山 智一1977 年 43 巻 516 号 p. 1395-1401
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーExperiments were made to study the frictional properties and abrasiveness of lapping tapes and a magnetic tape on two types of rubbing : a running tape against a rotating cylinder of Mn-Zn ferrite crystal, and a running tape against a rotating magnetic head made of ferrite at a high speed of approximately 11 m/s in a two heads helical scan type VTR. Coefficients of friction of tapes are generally independent of the normal load and the sliding speed. The coefficient of friction depends on the material of the abrasive used in tape, while it is independent of the size of abrasive. The coefficient of friction takes the value of approximately 0. 40, O. 30 and O. 24 in the cases of the 1000 and 2000 mesh alumina lapping tapes, the 2000 and 4000 mesh silicon carbide lapping tapes, and the VTR magnetic tape, respectively. In the repeated traversal of tapes, the frictional coefficient of lapping tapes decreases gradually and becomes a nearly constant value after several traversals. That of magnetic tape is, however, independent of the number of traversals. Stock removal of ferrite is proportional to the tape-lapping distance and the normal load applied by tape. The size of abrasive plays an important role on the stock removal rate and a small increase of the size of abrasive increases very much the stock removal rate.抄録全体を表示PDF形式でダウンロード (1355K) -
マルテンサイト鋼の研削き裂の生成機構 (第1報)江田 弘, 貴志 浩三1977 年 43 巻 516 号 p. 1402-1408
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーThe grinding cracks are frequently found in the medium and high carbon martensite steels such as Fe-C steels, bearing steels, Mo steels, Mn steels, Ni steels and Cr steels. We are decided to go back to the metal structure in the origin of the workpiece to observe the grinding cracks from metallographical standpoint. In this report, the first step of study is investigated the kern and origin of the grinding cracks in the martensite structure. The next step deals with the significance of existence for the grinding cracks of martensite impingement cracks and the shape or size of the minimum unit of it. A summary of the main results are shown below.
(1) The impingement cracks of martensite were observed the lenticular martensite in the many shape of it. And the impingement cracks were become frequently kern of grinding cracks.
(2) The combination of martensite's impingement cracks and grinding cracks were observed in many kinds of the workpiece.
(3) The generation of minimum unit size of grinding cracks are observed in the martensite crystal. And the length of it was shown very high frequency in the range of 4.0-5.0μm.
(4) The stain and impingement cracks of martensite is very high sensitivity of the notch effect or stress concentration.
(5) The generation of microcrack in γ-phase was not observed in the transformation from fcc to bct.抄録全体を表示PDF形式でダウンロード (8319K) -
加工温度および加工熱量の検討田中 秀穂, 岡村 俊一1977 年 43 巻 516 号 p. 1409-1414
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーIn Tube-end Spinning, “softening” of tube material with frictional heat generated at interface between die and tubular stock, is considered as the most important fundamental principle. And so, knowing about the forming temperature and effective heat to soften the tube material is required to discuss the formability for Tube-end Spinning. In this paper, the equation of mean temperature θm1 of material at forming portion, and effective heat Q1 which is available for softening tube material during the forming are formulated. The results are written as below.
(1) The mean temperature θm1 increases according to the increase of die revolution and decreases according to the increase of the feeding rate of tubular stock.
(2) Effective heat Q1 is proportional to the forming time and becomes larger according to die revolution increase, smaller according to feeding rate and die angle increase.
(3) Effective heat Q1 is about 20-40% of total heat, and the amount of heat flowing into die is largest among of heat losses.抄録全体を表示PDF形式でダウンロード (1000K) -
耐摩耗性レジノイドボンドダイヤモンド砥石の研削特性三宅 正二郎, 渡辺 純二, 上野 嘉之, 鶴田 兼吉1977 年 43 巻 516 号 p. 1415-1420
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーWhen ferrites used for magnetic recording heads are ground with resin bonded and fine grained diamond wheels, accuracies should be kept by lowering wheel wear and grinding residue caused by visco-elastic deformation of wheels. The fine grained diamond wheels were bonded by resin bond materials which were chosen from the standpoint of wear resistance, high temperature of thermal softening and low friction coefficient to ferrites. These wheels have been tested with respect to stock removal rate, wheel wear, grinding force and surface roughness. The results are as follows :
(1) Resin bonded wheels, including 6-12μm diamond abrasives, can grind ferrites without cracks in the worked surface.
(2) The wheel wear rate increases rapidly in the range over a certain stock removal rate, which corresponds to the change in the bond wear from micro-ploughing by chips or worked surface to adhesion or crushing, accompanied with thermal softening characterized by the thermal wear resistance test.
(3) The stock removal rate of wheels bonded by polyoxybenzoyl or thermosetting polyimide is approximately six times higher than that of phenolic resin bonded wheels.抄録全体を表示PDF形式でダウンロード (1044K) -
竹村 正, 浅田 博司1977 年 43 巻 516 号 p. 1421-1426
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーAn experimental investigation has been carried out on the chatter vibrations due to cutting force variations caused by the intermittent cutting and the periodic chip formation. In this paper turning experiments are carried out using a small tool-dynamometer of piezoelectric type attached to a cantilever-type structure which is assumed to vibrate only in the direction of the principal mode. The results obtained are as follows. (1) The amplitude of the forced chatter vibration induced by the intermittent cutting is not increased or decreased by the regenerative effect, irrespective of the direction of the principal mode. (2) In machining of the free-cutting brass and the austenitic stainless steel which create periodic chips, selfexcited chatter vibrations are induced in the cutting direction extremely. These vibrations are quite different from the regenerative chatter, and are induced because the period of the chip formation is controlled by the tool vibration.抄録全体を表示PDF形式でダウンロード (1329K) -
弾性接触の場合川井 謙一1977 年 43 巻 516 号 p. 1427-1432
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーA theoretical approach is presented to the plane theory of rolling contact with friction. An analysis is given of elastic contact of two cylinders. A comparison is discussed between the elastic stress fields from this analysis and from the theory of Hertz contact problem. If two cylinders have the same material properties, the pressure distribution and the width of contact agree with those of Hertz contact. If they have not the same material properties, the pressure distribution, the width and the location of the contact region differ from those of Hertz contact, however, for practical purposes the latter can be used. On the other hand, because of friction the stress fields in elastic medium shift to the direction of the frictional stress. Accordingly the location, where the material may initially yield, shifts to the same direction and approaches closer to the surface than that of Hertz contact.抄録全体を表示PDF形式でダウンロード (994K) -
ドリルチップー加工穴の軸受特性長谷川 嘉雄, 堀内 宰1977 年 43 巻 516 号 p. 1433-1439
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーThe drill tip in a hole is considered to be equivalent to the journal of an externally pressurized partial bearing. In this report, taking account of the bending of drill shank due to the cutting force and oil-film force, the equilibrium attitude of drill tip in the hole is simulated by digital computer, and then the bearing characteristic, especially the oil-film force is investigated. The simulation results correspond reasonably to the experimental results of the former reports within quantitative deviations of 20-30%. The bearing characteristics depend on the supply pressure of cutting fluid, the neck-skew of drill tip, the shank length, the viscosity of cutting fluid and the work speed. Such characteristics can explain the behavior of drill tip and the accuracy of holes clarified in the former reports.抄録全体を表示PDF形式でダウンロード (1233K) -
結城 明泰, 長谷川 嘉雄1977 年 43 巻 516 号 p. 1440-1442
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (569K) -
山崎 一生1977 年 43 巻 516 号 p. 1443-1448
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (3791K) -
相場 覚1977 年 43 巻 516 号 p. 1449-1453
発行日: 1977/12/05
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (1208K)
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