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36 巻, 431 号
選択された号の論文の11件中1～11を表示しています
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元木 幹雄, 藤田 一郎1970 年 36 巻 431 号 p. 783-789
発行日: 1970/12/05
公開日: 2009/07/23
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太田 信之, 川中 洋一1970 年 36 巻 431 号 p. 790-795
発行日: 1970/12/05
公開日: 2010/01/20
ジャーナル フリーThe discharge coefficient of the gate from which the flow of a molten metal is injected into the cavity of dies is very necessary, in order to design the dies used for die casting. In this research, the apparent discharge coefficient of the gate is investigated experimentally on following three ways which are often recognized in die casting dies.
1. flowed along a wall of cavity,
2. injected on flat or cylindrical core,
3. changed the direction of a flow in cavity of dies.
As the result, these coefficient are generally smaller than that in the case injected without interruption in atomosphere. Also these coefficient are changed according to the shape of a cavity and the thickness of a gate. Therefore the more complex the shape of cavity is and the thicker the gate is, the smaller this coefficient is.抄録全体を表示PDF形式でダウンロード (2188K) -
泉 四郎, 坂田 正登, 満田 博宣1970 年 36 巻 431 号 p. 796-802
発行日: 1970/12/05
公開日: 2010/01/20
ジャーナル フリーThis is the third report succeeding the fomer two, which were about the mathematical analysis of the behaviour of metal plate under the lateral impact. This report resumes and puts in order, the development and the results of the experiments carried out for several years for the orientation of the problem, to pursue the research. Every effort have been made to relate as precisely as possible the main subject of it in order. It is advocated that there is a good reason to regard especially lead (Pb) as the representative of the general metallic material, as far as the impact deformation is concerned. Therefore, the tension-strain relation S= K(1+ε) can be regarded as the base of motion of metal plate under lateral impact, because the results of the experiments agree in their profil form well with those of the theory which has been previousely constructed upon the same assumption. This is the present report, and after this, the more strict research has been carried out by considering ε-wave more precisely. In that case, the relation S=K(1+ε) becomes the 1st approximation formula. These will be reported next.抄録全体を表示PDF形式でダウンロード (6681K) -
鋼球の残留応力について(第1報)日紫喜 基久, 松浦 菊男, 堀 捷樹1970 年 36 巻 431 号 p. 803-807
発行日: 1970/12/05
公開日: 2009/07/23
ジャーナル フリーThe fatigue of the steel balls is influenced by the residual stresses. The purpose of this paper is to research the behavior of the residual stresses in the steel balls heat-treated at various conditions. The stresses are measured by X-ray diffraction.
The results obtained are summarized as follows:
1.The residual stresses do not always increase, even though the quenching temperature is raised. As a result there exists a quenching temperature in which the residual stresses are at the maximum.
2. As the tempering temperature is raised, the residual stresses after quenching decease.
3. The residual stresses change little by the tempering time.
4. The residual stresses in the steel balls quenched in oil are smaller than those quen-ched in water.
5. Subzero treatment has no influence upon the residual stresses.
All measured residual stresses in the steel balls are found to be compressive stresses which are useful for the fatigue life.抄録全体を表示PDF形式でダウンロード (4085K) -
圧縮加工中における材料の潤滑挙動(第2報)時沢 貢1970 年 36 巻 431 号 p. 808-813
発行日: 1970/12/05
公開日: 2009/07/23
ジャーナル フリーOn the basis of the study made in the deformation process with respect to the behaviours of friction and lubrication and also the micro-structure of metals, a new lubrication system has been proposed here. The behaviour of the metal can be observed by means of the light-etching method on the pre-deformed metal surface. The action of retained lubricants in the metal-tool-interface is due to the hydrostatic effect in the microscopic surface pockets of a work piece which are all formed due to several types of mechanism.
In type 1 where metal as aluminium, it resulted from asperities in different orientation of grains and the slip-band.
In type 2 where brass and carbon steel as metal, it resulted from the hollow pit between the convexed second phase (e.g, β-phase or pearlite) and the slip-band.
In type 3 where bearing steel as metal, it resulted from asperities to be associated with the different orientation of grains and also from the micro-cavities between carbides which are all dispersed finely and uniformly.
The low coefficient of friction which was observed in a smaller grain size seems to be from the fact that, a large amount of pit-space occupied by the surface pockets were finely continued with the fine slip-band in these pockets.抄録全体を表示PDF形式でダウンロード (8816K) -
噴射加工における砥粒の破砕について(第2報)山田 至朗, 柳島 釭仁夫1970 年 36 巻 431 号 p. 814-819
発行日: 1970/12/05
公開日: 2010/01/20
ジャーナル フリー噴射加工における連続性の要求に対し加工条件(乾湿噴射様式,被加工物および噴射角の変化)が,面あらさの変化を支配する主因たる,砥粒の破砕におよぼす影響について調べた結果つぎのことがわかった.
(1)同一噴射速度での乾式および湿式噴射砥粒の破砕について,90°噴射では疎水性のC砥粒は水の緩衝作用により乾式に比べて湿式噴射の方が破砕は少なく,親水性のA砥粒では水がふん囲気として砥粒の破砕を促す作用と緩衝作用とがほぼ相殺し,その結果乾・湿噴射様式による砥粒の破砕の差は微小となる.
またA砥粒,C砥粒ともに砥粒の破砕は被加工物のかたさと比例関係にあり,かたさの増加とともに砥粒の破砕は激しくなり,その消耗を促す.
(2)A砥粒について,噴射角を変化させると噴射角の減少とともに砥粒の被加工物への接触時間が増加し,水のふん囲気としての影響が増大して水の緩衝作用を上回るようになり,その結果乾式より湿式噴射の方が砥粒の破砕は激しくなる.なお噴射角を減少させると砥粒に働く垂直圧力は減少し,衝撃圧壊による砥粒の破砕は少なくなる.
破砕砥粒の顕微鏡写真より,90°噴射では砥粒は全体的に粒径が小さく,噴射角が減少すると比較的大きな粒径の砥粒が残留するようになり,これら径の大きな砥粒は水平分力の発生により被加工物との摩擦から先端はチッピングを起こして丸味を帯び,微細砥粒が増していることが観察され,前述の噴射角の減少による衝撃圧壊力の減少を裏付けた.
(3)噴射加工面のあらさについては砥粒径の変化より推察できるように,被加工物のかたさの大きいものでは連続性を維持することは困難であり,噴射角を減少させることは面あらさを小さくすると同時に連続性を維持するのに有効である.抄録全体を表示PDF形式でダウンロード (3681K) -
鳴瀧 良之助, 森脇 俊道1970 年 36 巻 431 号 p. 820-825
発行日: 1970/12/05
公開日: 2010/01/20
ジャーナル フリーThe goose-neck tool, which has been empirically used to prevent chatter vibration during parting operations etc. on a lathe, is analyzed from the view point of transfer function, and its effectiveness against chatter is theoretically shown. The analysis suggests necessity of large damping to increase effectiveness, and a method is presented to determine optimum spring constant and damping to be given. A damped goose-neck tool due to oil viscosity was manufactured and some cutting experiments were performed to show the validity of the analyses. From these tests, it was shown that the stable cutting width increased as the spring constant was decreased, however larger damping had to be given accordingly. The damped goose-neck tool was also proved to be effective at comparatively high cutting speeds, say 80 m/min in this test.抄録全体を表示PDF形式でダウンロード (1032K) -
中山 一雄1970 年 36 巻 431 号 p. 826-833
発行日: 1970/12/05
公開日: 2009/07/23
ジャーナル フリー以上三つの実験から,研削点近傍の弾性変形が仕上面あらさを小さくすることが確認された.その程度は,高速度鋼と軟鋼を比べた場合,4.3の平面研削で0.5~1μのあらさの差があったうちで,すくなくとも半分程度はこの弾性変形の差によるものである.
一般に,1μ程度のあらさの研削面に対して,加工物の硬度の差があらさを数十%も変えるということができる.抄録全体を表示PDF形式でダウンロード (3591K) -
山田 敏郎, 可児 弘毅, 西島 国広1970 年 36 巻 431 号 p. 834-838
発行日: 1970/12/05
公開日: 2009/07/23
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大塚 泰一郎1970 年 36 巻 431 号 p. 839-844
発行日: 1970/12/05
公開日: 2010/01/20
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1970 年 36 巻 431 号 p. 845-847
発行日: 1970/12/05
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (564K)
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