巻号一覧
後続誌
36 巻, 428 号
選択された号の論文の9件中1～9を表示しています
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深沢 正彦1970 年 36 巻 428 号 p. 589-594
発行日: 1970/09/05
公開日: 2009/07/23
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炭棄鋼S55C,HRC29~57について隈部 淳一郎, 大門 守, 谷口 修1970 年 36 巻 428 号 p. 595-601
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーThis report proves the possibility of precision turning for carbon steel hardened from HRC 29 to 57 by vibrating cutting. This cutting conditions are as follows: frequency; 21.3 kHz, amplitude; 15 μ, cutting speed; 1428 m/min. The main results obtained by experiments are as follows: 1) The chips formed by the vibrating cutting are unoxidized flow type chips whitygrey coloured. 2) Under the conditions, tool failures scarecely occurs. 3) The depth of cut is maintained just as set. Consequently, the smooth machined surface on which iridescent surface is generated is produced. 4) Machined surface roughness almost coincides with the theoretical roughness. 5) Machined surface is difficult to gather rust in comparison with the surface machined by conventional cutting. 6) It is proved that the steel hardened as far as hardness HRC57 can be machined precisely by turning.抄録全体を表示PDF形式でダウンロード (9525K) -
財満 鎮雄, 北村 利昭1970 年 36 巻 428 号 p. 602-607
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーFacing tests with a sintered carbide have been conducted on three sorts of aluminium-silicon cast alloys, of which silicon contents are 13%, 17% and 23%, in order to investigate the feasibility of facing test which is frequently applied as a quick tool life test for ferrous materials. In addition to it, the other machinability characteristics of aluminium-silicon cast alloy are studied.
The, tool life formula in facing, which was proposed by Brandsma on facing with a high speed steel tool, has been experimentally examined on 23% silicon aluminium alloy and has not been justified for this material. Thus, a new tool wear formula has been proposed for facing of aluminium alloys, and has been experimentally verified to agree fairly well. The tool wear is hardly recognized in facing 13% silicon aluminium alloy, whereas in the case of 17% and 23% silicon aluminium alloys recognizable wear occurs at higher cutting speeds, and, at the same time, the cutting force, especially, the traversing force, increases greatly. When the tool wear increases, the cutting temperature rise to nearly the recrystallization temperature of the work material.抄録全体を表示PDF形式でダウンロード (993K) -
研削砥石の結合度測定に関する研究(第2報)海野 邦昭, 篠崎 襄1970 年 36 巻 428 号 p. 608-614
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーIn this paper, the relation between the dynamic elastic modulus measured by ultrasonic pulse method and the grade of the grinding wheel is discussed.
The results obtained are as follows:
1. The grade of the grinding wheel can be determined by the dynamic elastic modulus.
2. The dynamic elastic modulus obtained experimentally has correlations not only with the percentage of the grain and the bond, but also with the bending strength of the grinding wheel.
3. By ultrasonic pulse method, it is not necessary to rectify the type and the shape of the grinding wheel, thus, this method is more convienient than sonic resonance frequency method, and the dynamic elastic modulus of it is easily calculated with the den sity and the ultrasonic velocity of the grinding wheel.
4. The dynamic elastic modulus has relation to the bitten-depth measured by bit-method, and there is no restriction of the grain size upon appiying this method to the grade determination.抄録全体を表示PDF形式でダウンロード (1204K) -
変形挙動について西山 卯二郎, 井上 卓, 千田 豊満1970 年 36 巻 428 号 p. 615-621
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーThe deforming behaviors of electrohydraulic forming were studied with the plastic strain gages directly attached to sheet. The first part of this study is intended to study the effect of the experimental conditions, especially the size effect of the water tank. In the second part, the strain-time diagrams of the first and the second deformations are measured and studied. The main results obtained are as follows.
1) The deforming process is generally divided into several stages in the large tank and the volumes of the first and second deformations take the large part of total deformation.
2) The volume of the first deformation decreases with the size of the tank, and the volumes of the others increase with the size of the tank.
3) The strain-time diagrams are measured. The duration of the deformation, the strain rate and so on are cleared up.
4) The effect of the air bag on the deforming process is cleared up and the result coincides with that of the high speed photograph.抄録全体を表示PDF形式でダウンロード (3132K) -
福井 保夫, 近藤 誠造1970 年 36 巻 428 号 p. 622-628
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリー以上コランダムバイトを試作し,その切削特性を実験的に検討した結果を要約するとつぎのようである.
(1)コランダムにより切れ刃稜あらさ0.5μ以下,丸み1μ以下の鋭利な切れ刃稜を持ったバイトを作ることができた.
(2)銅や黄銅に対してはすくい面摩耗は生ぜず,逃げ面や切れ刃稜の摩耗は超硬やセラミックの1/2~1/5程度である.アルミニウムに対しては凝着性が強く正常な切削ができない.炭素鋼に対してはチッピングや大きな欠けが生じやすい.
(3)アクリル,硬質塩化ビニル,フッ素樹脂などのプラスチックに対しては鋭利な切れ刃が長時間保たれ,刃先への溶着もなく,ダイヤモンドに近い切削性能を期待できる.しかし強化材の入った布入りフェノール樹脂などに対しては切れ刃がチッピングを起こしやすい.
(4)逃げ面をコランダムの結晶べー面にとった場合の逃げ面摩耗は結晶の他の面を逃げ面とした場合に比べかなり大きい.コランダムの微量固溶成分の耐摩耗性や切削性におよぼす影響はほとんど認められない.
(5)銅,黄銅,炭素鋼に対する切削抵抗,切削比は超硬と同じか少し良好な程度である.切削速度との関係も超硬とほとんど同じ傾向を示す.一方ダイヤモンドは銅や黄銅に対し切削抵抗は大幅に小さく,切削比は2倍近い値を示す.また切削速度の影響も少ない.
(6)このことからコランダムは金属被削材に対する親和性が高く,切削工具材としては金属的な性質を持っていると考えられる.
(7)切削仕上面は銅,黄銅,プラスチックともにセラミック,超硬,コランダム,ダイヤモンドの順に良くなっている.特にプラスチックと銅に対してコランダムの有効性は大きい.抄録全体を表示PDF形式でダウンロード (6925K) -
二次元切削機構の光弾塑性法による解析(第2報)奥島 啓弍, 垣野 義昭, 萩原 四郎, 橋本 博実1970 年 36 巻 428 号 p. 629-636
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーThe undry celluloid was orthogonally cut with dry celluloid tool to analyse the metal cutting mechanism. Then the effect of the friction between chip and tool, flank wear and tool sharpness radius on the cutting stresses was studied by means of model photo elasto-plasticity. The following conclusions are drawn from the present study.
1. While the frictional stress distribution along tool-face is almost uniform and equal to the maximum shear stress over the 2/3 of contact length, the normal stress increases from the cutting edge and reaches the maximum at some length from it, and decreases gradually toward the end of contact.
2. Larger friction between chip and tool makes the elasto-plastic boudary to be more convex downward and makes larger plastic region.
3. While tool sharpness radius and flank wear make considerably large effect on the machined surface, they make a small effect on the chip.
4. This model cutting test is in fairly good agreement with the cutting of brass for the points of plastic region, stress distribution along the tool-face, the cutting ratio and the friction coefficient.抄録全体を表示PDF形式でダウンロード (4588K) -
梶谷 誠, 石川 二郎, 今井 聖1970 年 36 巻 428 号 p. 637-642
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーIn this paper, a new method of tooth profile measurement is proposed. In this measuring method, the involute generating mechanism is not used. The principle of this method is that profile errors can be determined on a point-to-point basis by measuring the linear displacement of the tooth flank along a tangent to the base circle, and the angular displacement of the gear about its axis at the same time. This measuring system consists of two important elements: (1) the electronic digital readout circuit for linear and rotary measurements (using a linear optical grating and a rotary magnetic scale), and (2) the special-purpose digital computer. The computer computes the departure of the measured values from the theoretical values given by the relationship between the linear and rotary displacements. The main advantages of this method are as follows:
(1) It is not necessary to carry out calibration with the master involute specimen.
(2) For gears of different dimensions, the desired base circle radii can be selected by the preset switch operation on the panel of the computer.
(3) The mechanical structure of the measuring system has been simplified. Therefore, if the scales of high accuracy are incorporated with the measuring system, the measuring accuracy will assuredly be enhanced.抄録全体を表示PDF形式でダウンロード (3056K) -
-単石, 多石およびインプリ・ドレッサによる目直しの研究-横尾 嘉道, 瀬戸 雅文, 田戸 保1970 年 36 巻 428 号 p. 643-649
発行日: 1970/09/05
公開日: 2009/07/23
ジャーナル フリーPDF形式でダウンロード (4674K)
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