巻号一覧
後続誌
40 巻, 470 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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研削ベルトの研削作用に関する研究 (第2報)米津 栄, 稲崎 一郎, 柴田 順二, 黒崎 武文1974 年 40 巻 470 号 p. 221-226
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, wear process and grinding performance of coated abrasive belts are investigated, mainly upon their varying process for grinding time. The experiments are performed under constant force plunge grinding and fixed feed plunge grinding. As parameters expressing the worn state of coated abrasive belts, wear height of grain cutting edges a and the percent wear flat area η are used. The results obtained from the experiments are summarized as follows.
(1) δ consists of initial rapid wear height δn and steady wear height δt. The former is mainly caused by chipping fracture and the latter by attritious wear. The value δn and δt can be estimated from grinding conditions and grinding time.
(2) The mutual relation between δ and η depends on the shape and the distribution of grain cutting edges.
(3) Metal removal rate and grinding force calculated by the theoretical expression introduced in the previous paper agree approximately with these experimental results.
(4) The belt grinding performance is affected significantly by initial rapid wear.抄録全体を表示PDF形式でダウンロード (3066K) -
ファイバオプティクスによる金属鏡面の光沢測定に関する研究 (第2報)三好 隆志, 斉藤 勝政1974 年 40 巻 470 号 p. 227-232
発行日: 1974/03/05
公開日: 2010/02/16
ジャーナル フリーIn the previous report, the principles of the gloss measurement by the fiber optics glossmeter were discussed. In this paper, characteristics are experimentally measured. The results obtained are as following.
(1) The reflected luminous flux into the receiving fibers is kept constant within the range of 550850μm measuring distance, regardless of material and surface roughness of the polished metal specimen.
(2) The reflected luminous flux in the above mentioned range increases with the decrease of the surface roughness, within the range of 0.11.0μm Rmax.
(3) The reflected luminous flux in the above mentioned range does not change with the change of the slope angle within the range of ±4 degree of the specimen surface, regardless of the material and surface roughness of the polished metal specimen.
(4) The reflected luminous flux in the above mentioned range does not change with the change of the curvature of the polished metal surface, having the radius of curvature of ±25 mm and over.抄録全体を表示PDF形式でダウンロード (7194K) -
町田 史彦, 嘉数 侑昇, 沖野 教郎1974 年 40 巻 470 号 p. 233-237
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper gives an algorithm that converges quickly to a solution of the operational sequencing problem under any constraint of precedence relationship. And this method uses a conception called “reduction of feasible domain” in addition to the Little's algorithm. The outlines of this method are as follows.
(1) The precedence relationship is represented by matrix of which elements are denoted with 0 or 1.
(2) The complete precedence relationship is constructed by the relation between two operations (the former is precedence-matrix and the latter is incidence-matrix).
(3) All infeasible elements of the cost-matrix are forbidden by precedence-matrix.
(4) In order to effective search, the Little's motive of branching is used.
(5) Already determined partial sequences are considered as an operation and then new precedence-matrix is built up. Using them, infeasible elements of cost-matrix, newly appeared, are forbidden (“reduction of transferable domain”).
According as the repetition of process (5) and branching, it converges to a solution. Moreover, this method can be used under any constraint of precedence relationship, even if the system has no relation. As the examples of experiments, each of 13, 10, 21 operational sequencing problem is attempted and expected results are obtained.抄録全体を表示PDF形式でダウンロード (812K) -
大草 喜太雄, 北川 亮三1974 年 40 巻 470 号 p. 238-243
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーIt has been reported that the angle of engagement and disengagement have dominant influences on the tool life of a carbide face-milling cutter and may lead early to the fracture of carbide tips when they are over some critical values. In this study, the methods of facemilling of an end face of cylindrical workpiece or half and hollow-cylindrical workpieces prepared from rectangular blocks which allow continuous change of these angles simultaneously or either angle independently are proposed. Applying these methods, the properties of carbides on the early fracture before the occurrence of steady progression of wear are tested. The appearance of this tool failure is most unfavourable, showing the shortage of toughness of carbide tips for a given machining job.
As carbide tips of better wear resistance have generally less shock resistance, the test for early fracture due to the lack of toughness is considered to be necessary for the selection and estimation of suitable carbide tips. Test results show that the properties for early fracture of carbide tips of which toughness having been classified by the static toughness test can be evaluated dynamically and simply by the cutting methods mentioned above.抄録全体を表示PDF形式でダウンロード (8115K) -
切削力および寸法精度に関する適応制御本多 庸悟, 竹山 秀彦, 安部 哲夫1974 年 40 巻 470 号 p. 244-249
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーA model of a computer-adaptive controlled lathe work system has been constructed and experimented for a prototype of a higher-leveled automatic machining system, and conversational direct computer control (CDCC), one of the functions of the system, has been reported in the 1st report. In this report, the adaptive control function consisting of cutting force control and accuracy control, which is the other function of the system and connectedly operates with CDCC, is reported. Logics of both cutting force and accuracy control have been implemented as a computer software, and detectors including strain gages and thermocouples have been utilized and connected to the computer. As a result of experiments, cutting force control has automatically and stably selected feed rates in rough cutting, and accuracy control in finish cutting has reduced errors of workpiece diameters.抄録全体を表示PDF形式でダウンロード (8865K) -
測定長と表面おうとつの統計量の関係塚田 忠夫, 阿武 芳朗1974 年 40 巻 470 号 p. 250-255
発行日: 1974/03/05
公開日: 2010/02/16
ジャーナル フリーA long sampling length is necessary to obtain the statistic of surface asperities which are applied to the plane joint problems. This report presents the necessary sampling lengths of surface asperities for the standard deviation σ of asperity heights and that of projection slopes ae, besides the maximum height Rmax and the ten point height Rz are discussed in connection with a sampling length. The results are as follows.
(1) The necessary sampling length to obtain σ is 500ε0 (ε0 is the minimum independent space), and that for εξ is 50ε0.
(2) The relation between Rmax or Rz and σ is given analytically.
(3) The standard sampling lengths of JIS are shorter than the above-mentioned necessary lengths.抄録全体を表示PDF形式でダウンロード (1076K) -
寸法生成過程中島 利勝, 岡村 健二郎, 木下 輝一1974 年 40 巻 470 号 p. 256-262
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーThe accumulation phenomena originate in grinding, because a cutting process of an abrasive grain is transitional and then various kinds of stock remain unremoved due to the difference of the radius reduction of workpiece from the interference depth of wheel. The accumulation phenomena result in the existence of three distinct grinding states in a cycle of cylindrical plunge grinding, a transient, a steady and a spark-out grinding state. The purpose of this study is to get a foundation for scientific understanding of grinding by analyzing transient characteristics in grinding. In this report the size generation process in cylindrical plunge grinding is discussed by analyzing the size generation curve, stock removal and various kinds of stock unremoved in the three grinding states.抄録全体を表示PDF形式でダウンロード (3627K) -
相羽 三良1974 年 40 巻 470 号 p. 263-268
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーIt is theoretically shown that the dynamical properties of an electrical servo-mechanism can be remarkably improved by appropriately switching on and off the negative velocity feedback using a tacho-generator, a logical circuit and a relay. The construction of the system and the logical circuit are shown. Denoting by ε the deviation, when (ε+αε) ε>0, the velocity feedback is made off, and when (ε+αε) ε>0, the velocity feedback is made on, where α is an adjustable coefficient. The optimal value of α is nearly inversely proportional to the damping coefficient ratio of the system when the velocity feedback is on. It is shown by computation that using such a mechanism, when the damping coefficient ratio of the system without the velocity feedback is 0.02, the settling time, the integral of the absolute error and the integral of the squared error in the case of the indecial response are made smaller by about 50, 35 and 30 % respectively compared to the case of an ordinary linear servo-mechanism. Simulation by an analog computer and an experiment using a two-phase servo-motor were made and good results were obtained.抄録全体を表示PDF形式でダウンロード (5769K) -
中山 一雄1974 年 40 巻 470 号 p. 269-274
発行日: 1974/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (967K)
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