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40 巻, 477 号
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牧野 洋1974 年 40 巻 477 号 p. 803-808
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1528K) -
福田 理一, 常盤 徹1974 年 40 巻 477 号 p. 809-814
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーIn this paper the contact stiffness between grinding wheel and workpiece is experimentally investigated by dynamical method and formulated, in order to analyse the quantitative relation between frequency and amplitude of workpiece in external grinding in a system including contact stiffness. The contact stiffness is determined from the natural frequency measured by the impulse response of workpiece, which is pushed statically against grinding wheel with a preload. As a result of the investigation, it is found that the contact stiffness thus obtained can be formulated by the form of power function of normal contact force and further transformed into power function of equivalent elastic deformation in contact zone, and is proportional to contact width. The effect of contact length upon contact stiffness is also investigated and summarized with the calculated contact length under load, and then a method to estimate the contact stiffness under any contact length is described. Finally the vibration of workpiece, upon which the non-linear contact stiffness acts, is analysed by energy method and the effect of amplitude on frequency is quantitatively discussed.抄録全体を表示PDF形式でダウンロード (1045K) -
佐田 登志夫, 谷戸 勉, 荒木 透, 伊藤 哲朗, 岩田 一明, 上原 邦雄, 臼井 英治, 大草 喜太郎, 大沢 恂, 奥島 啓弐, 長 ...1974 年 40 巻 477 号 p. 815-820
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーThe paper deals with the effect of sulfur and phosphorus contents in steels on the drill life, drilling resistance, oversize of holes and chip formation. Also discussed is the cause of the variation of the test results at different laboratories. The conclusions are summarized as follows:
(1) The most reliable drill life models are statistically found as
L=exp[b0] (100S) b1 (100P)b2Vb3
for 0.45% carbon steels (JIS S45C), and
L=exp[b0'] (100S)b1'Vb3'
for low-carbon chrome-molybdenum steels (JIS SCM 22).
(2) As the sulfur content is increased, the drill life is increased, the drilling resistance decreased and the chip thickness decreased. The phosphorus content has the inverse effect. The both have almost no effect on the over-size of holes.
(3) When the material drilled produces brittle chips, the drill life is increased because of the lower resistance and temperature, and vice versa.
(4) The large differences in the drill life and drilling resistance between the test results obtained at the participant laboratories are found to be attributed to the difference in the properties, especially the rotating accuracy of the spindle, of the machines used.抄録全体を表示PDF形式でダウンロード (906K) -
単粒研削における干渉現象(第3報)森 昌幹, 久米原 宏之1974 年 40 巻 477 号 p. 821-825
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーIn face ground surfaces with crosshatched grooves, the surface roughness is very complicated because the grooves mutually interfere when they are produced. In order to research the mechanism to produce the roughness experimentally, as a model of face ground surfaces, brass test surfaces are face ground with a pyramidal diamond tool under various crosshatched angle ψ and pitch λn and the statistical quantities of the roughness are calculated. As a re-sult, roughly speaking, average height, standard deviation, skewness, kurtosis of the roughness distributions approach their theoretical values as ψ approaches 90° or λn increases. The influence of ψ on these values can be explicated by piling-up length ratio induced from the relation of balance between the ploughing force loaded on the uncut chip and its shearing resistance, that of λn can be explicated by the ratio of the theoretical values to the experimental values. Sharpness of periodicity increases as ψ approaches 30° or 150°, or λn increases. These can be explicated by periodic component and random component in power spectra.抄録全体を表示PDF形式でダウンロード (783K) -
本機構の理論解析とその数値計算松田 孝, 石田 健二郎, 押谷 康男1974 年 40 巻 477 号 p. 826-832
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーUnbalanced inertia force and torque due to reciprocating mass, which have been assumed inevitable in the known rotation-reciprocation mechanism (to be designated as known mechanism), can be perfectly eliminated by means of the perfectly balanced rotation-reciprocation mechanism (to be designated as perfectly balanced mechanism). However, on account of the dimensional restriction of perfectly balanced mechanism, sufficient strength can't be given to some of the perfectly balanced rotation-reciprocation devices which satisfy the conditions of perfectly balanced mechanism. The primary purposes of this investigation are to design the new rotation-reciprocation mechanism which relaxes the above-mentioned dimensional restriction and moreover keeps the merits of perfectly balanced mechanism, and to theoretically analyze its motion and balance. First, an approximately balanced rotation-reciprocation mechanism (to be designated as approximately balanced mechanism) is devised, and their theoretical analyses about elliptical motion and approximate balance are carried out. And, from the results of their numerical computations, it is ascertained that this mechanism answers the purposes of this investigation. Then, it is described that these theories can be applied to perfectly balanced mechanism and known mechanism.抄録全体を表示PDF形式でダウンロード (1019K) -
吉川 弘之, 古川 健, 守友 貞雄, 辰巳 洋司1974 年 40 巻 477 号 p. 833-839
発行日: 1974年
公開日: 2010/02/16
ジャーナル フリー(1) 研削加工において「砥石一工作物」間の相対峯1勺変位を制御することにより工作物の形状精度を向上させることができる.試作機による実験では制御を行って研削したときと,定送り研削のときではその真円度誤差の比は1/2～1/4となり,制御を行って研削した方が精度が向上し,しかもスパークアウト時間を短縮することができるため加工能率も向上する.
(2) 試作機の切込み系の周波数特性は13Hzまではほぼ一定であるが, 14Hz以上に多くの共振点が存在するため,制御可能な形状は13Hz以下の波形であるが,切込み系に適切なダンパを設けて制御範囲を拡張することが可能である.
(3) 一定の砥石切込み送り量に対する実研削量の比を研削加工特性を表す値と考え,砥石切込みを周期的に変動させたときの実際の切込み量を測定し切込みの周波数についてプロットした値は13Hzまではほぼ一定であった。しかし切込み送り量と実際の研削量とは必ずしも比例していないため,今回行ったゲイン(Ks)一定の制御では1μm以下の真円度誤差の修正が行われなかった.今後はこの特性を明らかにし,誤差に応じたゲでンの自動調整が必要になる.
(4) この制御システムは「砥石一工作物」系の機械的な剛性を見かけ上高めたことになり,安定した状態で研削加工が行われるため,機械や砥石に無理な荷重がかからず,また工作物の仕上面の表面状態(加工変質層や面あらさ)を良好にすることができる.抄録全体を表示PDF形式でダウンロード (1323K) -
だ円振動による振動輸送岡部 佐規一, 横山 恭男, 神保 泰雄1974 年 40 巻 477 号 p. 840-845
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーThis paper treats vibratory conveying by elliptical vibration. When particles are conveyed without jumping on a vibratory surface, types of motion are classified into seven modes. Classification of these modes is determined by three dimensionless quantities Qaφ, Qbφ and φ1-φ2 which are introduced from the conveying condition. Qaδ and Qbδ correspond to Qa andQb respectively which were discussed already in previous reports treating the conveying by rectilinear vibration. When Qaδ>1., forward slipping exists, while when Qbδ> 1, backward slipping exists. The parameter φ1-φ2 is effective in the region of mode IV in which the particle slides forward and backward alternately during one period of vibration. These relations can be plotted on various diagrams and each region of modes can be clarified. Mean velocity v of the particle can be calculated analytically and conveying velocity factor Vδ which was defined already in a previous report can be also calculated. Vδ is a function of four dimensionless quantities. Relation between the conveying condition and the conveying velocity is shown by equi-Vδ-curve in various diagrams. Referring to these analytical results, optimum conveying condition and conveying velocity can be obtained. These results show that the vibratory conveying by elliptical vibration is more advantageous than the conveying by rectilinear vibration. It has been confirmed that the above theoretical results agree well with experimental studies.抄録全体を表示PDF形式でダウンロード (1105K) -
中山 守, 山本 博士, 工藤 勝久1974 年 40 巻 477 号 p. 846-851
発行日: 1974年
公開日: 2010/02/16
ジャーナル フリーAlthough many papers have already been reported on abrasive belt grinding, few of them deal with special reference to the effects of grinding fluids. In this paper, the effects of oilbase grinding fluids, especially of their additive concentration and viscosity on the grinding performances are investigated experimentally with a platen type of abrasive belt grinding of an annealed medium carbon steel bar at a constant pressure. The main results are summarized as follows.
(1) Both of oleic acid and sulfur (di-tertiary nonyl polysulfide) used as additives are effective in increasing the stock removal and in decreasing the abrasive belt wear in a relatively low range of additive concentrations. At higher concentration, the effectiveness saturates for oleic acid and decreases on the contrary for sulfur. With respect to the sulfur, there exists the optimum sulfur-concentration giving the maximum performances of abrasive belt grinding.
(2) According as the viscosity of blended mineral oil becomes higher, the stock removal decreases monotonously. As to the belt wear, however, there exists the worst viscosity at which the wear attains to the maximum.抄録全体を表示PDF形式でダウンロード (1051K) -
超仕上砥石の仕上性能向上に関する研究(第1報)松森 昇, 山本 明1974 年 40 巻 477 号 p. 852-857
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリー以上の実験結果より,下記の結論が得られる.
(1) 超仕上加工能率と仕上面品質を向上させるためには,その仕上条件に適当な臨界圧力をもっ砥石が必要である.
(2) ユーザとして,仕上性能を安定して管理するために,また砥石メーカとして砥石品質を総合的に管理し,安定した性能をもっ砥石を生産提供するためには,従来のRH硬度だけでなく,臨界圧力値による管理を考える必要がある.
(3) ここで用いた簡易試験機でも仕上条件を適切に選ぶことによって,生産機に相応した実験を行い,臨界圧力を管理できる.
(4) イオウ処理することによって,砥石の気孔率,結合度,臨界圧力が大きく変化し,また仕上性能は大いに改善され,経済性も増す.抄録全体を表示PDF形式でダウンロード (945K) -
切削現象に及ぼすふん囲気の効果上神 謙次郎, 玉村 謙太郎, 古市 亮蔵1974 年 40 巻 477 号 p. 858-864
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーThe paper is one of the serial investigations on the effects of gaseous atmosphere on cutting mechanism. The cutting temperatures are measured in the various gaseous jet atmospheres by means of the tool-work thermocouple technique for the orthogonal turning of the plain carbon steel (S 45 C) tube ends. Moreover, the line analysis of built-up edges (BUE) which were obtained by quick-stopping technique was run by EPMA.
The summary of results are shown below.
In the oxygen jet atmosphere, the wedge type of BUE occurs at low cutting speeds where the nose type of BUE occurs in the normal atmosphere, i.e., conventional dry. Moreover, the size of the wedge type of BUE depends on the supplying conditions of oxygen jet. In the supplying of oxygen jet at the beginning of turning, the small wedge type of BUE occurs and the measured temperatures are higher than that in the normal atmosphere. On the other hand, in the subsequent supplying of oxygen jet, the large size of BUE and lower cutting temperature are obtained. From the analysis of BUE by EPMA, the oxide is recognized in a zone between the rake face of the wedge type of BUE and the chip.抄録全体を表示PDF形式でダウンロード (1606K) -
高剛性・高速度心なし研削盤の活用のために宮下 政和1974 年 40 巻 477 号 p. 865-871
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーRepresentation of the unstable vibration characteristics of a centerless grinding system is complicated, different from the case of center-type grinding, because of the work supporting method, in particular, the important function of the center-height angle. Therefore, according to the previous methods, it has been very difficult to show the remedies for the stabilization as a whole analytically and experimentally. In the present paper, the criterion diagram of the stability for the centerless grinding system is newly introduced, and it permits explanation of the unstable vibration phenomena, the derivation of the stable grinding conditions and gives the concrete remedies for the stabilization. From this analysis, it is shown that developing a high-stiffness and high-speed centerless grinder makes it possible to grind keeping dynamic stability even under the most suitable center-height angle to the worked out-of-roundness for the various external disturbances, that is, the centerless grinder with high productivity as well as high working accuracy can be expected to be realized.抄録全体を表示PDF形式でダウンロード (1012K) -
神宮 利夫1974 年 40 巻 477 号 p. 872-878
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーAn analysis was given of the distribution of stress in semi-infinite elastic medium deformed by the pressure of rigid sphere on a part of plane boundary. The stress components obtained from such an analysis can be expressed with the integral equation. The solution of the integral equation, however so far has been discussed only to find the distribution of stress acting on the interface. To find the aspect of stress beneath the interface, some consideration is needed to solve the integral equation. This paper is to describe the method how to solve the integral equation and, to discuss the aspect of stress with based on the result.抄録全体を表示PDF形式でダウンロード (890K) -
ホログラフィ干渉で検出されたねじとラックのピッチ信号(続報)谷村 吉久, 佐久間 健司1974 年 40 巻 477 号 p. 879-885
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーIn the previous paper, it has been reported that pitch signals of a screw for micrometer and a rack for dial gauge can be detected by using holographic interference technique. This paper describes the practical measurement to get the pitch error of the screw and rack, the two different ways to form the pitch signals detected and the effect of a convex lens set behind hologram in order to position tooth surfaces of the rack. To position the tooth surfaces, it is necessary to condense the first-order diffraction of signal beam by means of the convex lens until the beam becomes the same size as a detector having circular window. As the results of the experience, the followings are obtained: 1) the tooth surfaces as well as the threaded flanks can be sharply positioned by setting the convex lens and the effect is clarified by theoretical analysis and practical experience, and 2) the pitches of the screw and rack can be measured by holographic interference and the measuring values are obtained with the dispersion of less than 1.2μm over 40mm of a whole thread length of the screw.抄録全体を表示PDF形式でダウンロード (1064K) -
寸法生成過程に及ぼす研削条件の影響岡村 健二郎, 中島 利勝1974 年 40 巻 477 号 p. 886-891
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーIn grinding there exist accumulation phenomena, because a cutting process of an abrasive grain is transitional and then various kinds of stock remain unremoved due to the inequality between interference depth of wheel and radius reduction of workpiece by grinding action. The accumulation phenomena result in the existence of three distinct grinding states, a transient, a steady and a spark-out grinding states. In this report, the beginning condition for size generation is first made clear by analyzing grinding time up to the beginning point of size generation, real interference depth of wheel and grinding force in the beginning point of size generation. Effects of grinding conditions, such as interference depth of wheel, speed ratio, grinding system condition, wheel grade and dressing condition, upon the size generation process are then discussed by analyzing stock removal in the three grinding states and final stock remained unremoved.抄録全体を表示PDF形式でダウンロード (821K) -
野原 石松1974 年 40 巻 477 号 p. 892-897
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1184K) -
電子部品の接続技術分科会1974 年 40 巻 477 号 p. 898-901
発行日: 1974年
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (840K)
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