巻号一覧
後続誌
38 巻, 454 号
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樋渡 涓二1972 年 38 巻 454 号 p. 883-889
発行日: 1972/11/05
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (1734K) -
濱田 秀夫1972 年 38 巻 454 号 p. 890-895
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1146K) -
橋本 文雄1972 年 38 巻 454 号 p. 896-901
発行日: 1972/11/05
公開日: 2009/06/30
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切りくずのテンパカラーよりの切削温度の推定(第1報)藤村 善雄1972 年 38 巻 454 号 p. 902-907
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーDicision is made at the shop whether the cutting condition is suitable for steel cutting, by observing the tempercolor on the chips. This paper shows that the temper-color can be represented numerically, at the first step to think over its theoretical backing. For this purpose, the temper color results from taking out and leaving in the air the long and thin steel plates that was heated in Argon gas.
Thus the C.I.E. Chromaticity Coordinated is calculated by the use of the rate reflection curve which is measured from the temper color appearing on the specimen by a Spectro Photometer.
While based on asumption that the oxide film on the metal surface is made up a single layer of Fe3O4, the value which is obtained by the caluculation of the relation between the oxide film theckness and the temper color is shown on the Chromaticity Deagram.
In case the oxide film thickness is less than 100 mμ, the expermental values of the temper color agree well with theoretical curve of the Chromaticity Diagram.
Therefore, the oxide film which is produced on a thin plate cooled instantaneously after heating can be regarded as the single layer of Fe3O4. By the use of this Chromaticity Diagram, the value of the film thickness as corresponds to an optional temper color is obtainded. Practically the temper color which has required the complex expression so for, can be experssed simply the oxide film thickness.抄録全体を表示PDF形式でダウンロード (2516K) -
水野 万亀雄1972 年 38 巻 454 号 p. 908-915
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, characteristics of wear curves are analyzed by tracing of 198Au radioactive wear particles.
The quantity and the location of wear particles are detected by this method, and also it becomes clear whether the wear particles are transferred on the mating surface, or back transferred to an original test pin, or removed from the rubbed surfaces. The conclusions obtained from the experiments are summarized as follows.
1) The quantity of wear of a pin is determined as the arithmetic sum of the quantities of transfer and removal of wear particles. Namely, the difference between the rates of transfer, removal and back transfer governs the virtual rate of pin.
2) Generally, the transferred particles adhere strongly to the mating surface, con-sequently are not readily removed off. Moreover, the most of removal are born directly from the rubbed surface of a pin.
3) In the special conditions, a little quantity of removal of the transferred particles occurs, and it causes the marked increase in the wear loss of a pin. However, when the back transfer is predominant, it will be negative wear loss.
4) The avalanche phenomena of transferred particles occur when the quantity of trans-ferred particles becomes over the certain limited quantity. This means the sudden decrease of the transferred wear particles.抄録全体を表示PDF形式でダウンロード (1090K) -
切れ刃の損耗と切削抵抗岡本 定次, 安味 貞正, 三田 康明1972 年 38 巻 454 号 p. 916-921
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーCeramic tool is necessary to take some measures for use, because it is weak against mechanical and thermal shocks. In this study, the authors tried to verify some effects of the chamfered cutting edge in the initial stage of tool wear. This test was made by the orthogonal cutting of a special cast iron with the conventional edge tool and the chamfered edge tools of ceramics. This paper expresses the tool wear as frequency curve of valley number of profile curve on cutting edge mound. Change of form of the frequency curve is related with the order of wear. The chamfered cutting edge tools are compared with the conventional edge tool on the order of wear. The latter proceeds with larger order of wear than the former. The reason of this fact is explained by the investigation of the cutting force.抄録全体を表示PDF形式でダウンロード (2372K) -
岸浪 建史, 秋山 俊彦, 斉藤 勝政1972 年 38 巻 454 号 p. 922-928
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーStress-strain distributions in the cutting plastic zone are analysed by using the Visioplasticity method with a digital computer.
Steady-state flow patterns for these analysis are obtained from the cutting of alpha brass with a 30 deg. rake angle tool, 13.6 mm/sec cutting tool speed and 1.5 mm depth of cut.
The plastic behavior in metal cutting is discussed from obtained results.抄録全体を表示PDF形式でダウンロード (2709K) -
圧力角条件および三条件の総合牧野 洋1972 年 38 巻 454 号 p. 929-932
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーThe pressure angle of the parallel index cam mechanism is larger than the usual plate cam. The transition of pressure angle for a typical cam is calculated and illustrated. The selection of the follower size ratio l/c is limited by the three restrictions; outer-diameter, undercut and pressure angle restriction. Moderate value of the follower size ratio is illustrated for the Cycloidal Curve and Modified Sine Curve.抄録全体を表示PDF形式でダウンロード (382K) -
米田 孝夫, 沖野 教郎1972 年 38 巻 454 号 p. 933-938
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーIn usual scheduling problems, same goods are simplified as a lot and regarded as a job, i. e., each job's operation time must be replaced by each lots.
In theory, this kind of simplification, however, causes the overestimation of idle time of machines in a production system which process each goods successively from lot to lot and so the exact solution of total processing time cannot be obtained.
In this paper, the algorithm to the following 3 results are shown for the practical flow shop production system, taking account of the above problems.
1) Exact solution of total processing time
2) Optimal job sequence (which minimizes the total processing time)
3) Optimal lot size (which minimizes the completion time of the last goods)
In order to solve these problems, we make use of the branch and bound technique whose lower bound are estimated by the basic algorithm for mass production of one kind of goods.抄録全体を表示PDF形式でダウンロード (1271K) -
木下 直治, 花岡 忠昭, 坂宮 一彦1972 年 38 巻 454 号 p. 939-944
発行日: 1972/11/05
公開日: 2010/02/16
ジャーナル フリー正八角形加工物の一つの角を取り出して,加工物が正八角形から円になってゆく過程を立体的に示したのが図10である.図10は研削速度が1880m/min,切込み速度が10μm/sec,コンタクトホイルの硬度がDro 40で研削した加工物を形状測定装置で研削時間30秒ごとに測定した結果である.円孤の部分が研削面であり,研削時間の経過とともに円孤が長くなることから研削時間の経過とともに研削面が長くなり,研削時間が300秒になると加工物の全周面が研削されることがわかる.図7,図8に示された実測による研削時間と研削深さ,単位時間当りの研削深さとの関係は図3,図4に示された理論計算から求められた研削時間と研削深さ,単位時間当りの研削深さとの関係とよく一致している.研削速度を1880m/min,切込み速度を5μm/secとして研削加工を行なった実験値による研削時間と単位時間当りの研削深さとの関係を示した図8の曲線からKの値を求めると,Dro 40とDro 80のコンタクトホイルを使用した場合にはKの値が0.04～0.05の範囲にあると考えられる.また,コンタクトホイルの硬いものを使用して研削した場合にKの値が大きくなる.このKの値は円筒形加工物を円筒研削した場合とほぼ同じである.このことから,取りしろが変動する加工物も取りしろの変動がない円筒形加工物と同じように円筒研削ができ,円筒形加工物を円筒研削したときに求められるKの値を用いて,正八角形加工物が円筒研削されて円形になる過程を理論計算することができた.そこで正八角形加工物が円形になるサイクルタイムを理論計算から求めた.
加工物の最後に研削される部分(図1のB点)における単位時間当りの研削深さについて考えると,(10)式でθ=0とおけば,ve=vs[1-exp{-K(t-R0/vs×0.0761)}](13)となる.これを一次おくれの要素とみなして,正八角形加工物が円形になるサイクルタイムを時定数の考え方で表わす.
Tを時定数とし,(13)式でve=0.63vs,t=Tとすると,
T=0.994/K+0.0761×R0/vsとなる.
(14)式においてvs=5,10,20,40μm/secとして係数Kと時定数丁との関係を示したのが図11である.図11より切込み速度が増すとサイクルタイムは短かくなり,特に切込み速度が5～10μm/secと比較的低速度のときにその効果は大きく現われる.今回の実験範囲はvs=5,10μm/sec,K=0.04～0.05であり,この範囲ではコンタクトホイルの硬さがサイクルタイムに及ぼす影響がほとんど見られない.
また,回式の0.0761×R0は加工物の形状によって決まる値で山の高さを表わしており,加工物が正八角形以外の形状であるときにも加工物の山の高さを知ることができれば,(14)式により作業のサイクルタイムが計算できる.
なお,理論計算と実験結果をまとめるとっぎのようになる.
(1)取りしろが変動する加工物を研削するときも,円形加工物を研削するときと同じように研削でき,工具と加工物との問に飛び跳ねなどの現象が見られない.
(2)本研究でたてた理論式によって計算した結果と実験結果とがよく一致しており,この実験では砥粒先端角,被削材の降伏応力などによって決まる係数KGとコンタクトホイルのばね定数Kwとの積である係数Kが0.04～0.05の範囲にあった.これは円筒形加工物を研摩ベルトによって円筒研削したときの値とほぼ等しくなった.また理論式により作業のサイクルタイムが計算できた.抄録全体を表示PDF形式でダウンロード (2596K) -
会田 俊夫, 新井 典久, 安達 茂雄, 久保 喜男1972 年 38 巻 454 号 p. 945-952
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーThe main objective of this paper is to introduce the most suitable conditions of surface rolling through examing the influence of the surface rolling at the root fillet on the bending fatigue strength of sintered metal, cast iron and ductile cast iron gears and to clarify the factors influencing on the improvement of bending fatigue strength of those gears by the surface rolling in comparison with that of 0.45% carbon steel gears.
Results obtained are as follows:
(1) Surface rolling for gears made of rough structural and brittle materials (sintered metal, cast iron and ductile cast iron) gives the better effect in comparison with gears made of ductile materials (O.45% carbon steel).
(2) The improvement of bending fatigue strength for gears made of rough structural and brittle materials is caused mainly by the rise of hardness and increase of the apparent density in structure, and partly by the residual stress of rolling surface. On the other hand, main factors influencing on the improvement of bending fatigue strength for gears made of ductile materials are the rise of hardness and residual stress.
(3) The best conditions of surface rolling for those gears became clear, and those were shown in the Table 2.抄録全体を表示PDF形式でダウンロード (782K) -
フェライトの加工変質層(第1報)渡辺 純二, 上野 嘉之1972 年 38 巻 454 号 p. 953-959
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーIn order to determine the working conditions in abrasive machining of ferrites used for magnetic recording heads, machinability of single crystal and poly-crystal ferrites is investigated through observation on the cracks originated by pyramidal scratching and indenting tests.
On the other hand, the depths of cracks generated by grinding or lapping are measured with a taper-sectioning method, and related to the results mentioned above.
Results obtained are as follows:
(1) The extent of the crack caused with scratching and indenting of diamond pyramids is related to the load by a power function.
(2) On the poly-crystal ferrites, the crack propagation is prevented at the grain boundaries.
(3) Depth of fracture layers in grinding can be predicted from scratching with diamond pyramid, but is constant in the region of the grinding parameters ordinally used.
(4) Depth of fracture layers in lapping can be related to the depth of crack caused with indenting of diamond pyramid, when a mean diameter of abrasive particle is corresponded to the indenting load which act to each abrasives.抄録全体を表示PDF形式でダウンロード (7054K) -
宮崎 俊行, 谷口 紀男1972 年 38 巻 454 号 p. 960-965
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーThe high power density electron beam can produce a narrow and deep melting in metal. This phenomenon is caused by the deep penetration of electron beam into metal. In this paper the mechanism of this deep penetration is discussed. Namely, the X-ray generated by collision of electron with metal is measured by scintillation counter and X-ray film and then the new model about the penetration path of electron beam originated from the experimental data of X-ray and the theoretical considerations is proposed. Moreover, the fluctuation of the penetration path is discussed theoretically and the change of the shape of molten zone with respect to metals can be explained.抄録全体を表示PDF形式でダウンロード (832K) -
光岡 豊一1972 年 38 巻 454 号 p. 966-975
発行日: 1972/11/05
公開日: 2009/06/30
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ミクロからみた塑性古川 浩1972 年 38 巻 454 号 p. 976-985
発行日: 1972/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (6357K)
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