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44 巻, 519 号
選択された号の論文の16件中1～16を表示しています
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山田 康宏1978 年 44 巻 519 号 p. 285-291
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1486K) -
摩耗面における突起頂点分布の形成機構鏡 重次郎, 山田 国男, 武田 信男, 直井 貞司1978 年 44 巻 519 号 p. 292-298
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーMechanism of formation of the asperity height distribution on surfaces in mild and steady wear was theoretically analysed, assuming that the asperities were in elastic contact. Then. the investigations were carried out by wear tests with Pylex glass in regard to the theoretical results. The main results were as follows:
(1) The real asperity height distributions that were theoretically calculated were similar to the theoretical ones. Then it was found that both values of the standard deviations of the distributions obtained by the experiment and analysis were increased as the load under which surfaces were in contact was increased.
(2) In this analysis, it was found that positions at which the asperity height distributions had maxima, came into regions in which the asperities were in contact.抄録全体を表示PDF形式でダウンロード (1064K) -
空転時間比ならびに被削材種の影響浅井 毅, 中谷 征司, 原 昭夫1978 年 44 巻 519 号 p. 299-306
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーIn the 1st report, the early fracture of P 20 carbide tool was investigated on the interrupted turning of steel (S 45 C) under the four kinds of the tool/work engagement and disengagement conditions in order to obtain the basic idea which would help in the development of carbide tools having higher early fracture resistance. The results were discussed using the "cutting speed(V)-feed rate(F) diagram", and, the "mean normal(σ) and shearing stress(τ) on the rake face-cutting temperature(T) diagram" under the steady state condition. This paper describes, further, some experiments on the interrupted turning of steel in order to elucidate the influence of the non-cutting time/cutting time ratio and work materials upon the early fracture. The conclusions were as follows:
(1) The influence of the non-cutting time/cutting time ratio on the early fracture was hardly found.
(2) The experimental fracture criteria of P 20 on σ-T map transcribed from V-F diagram was found peculiar to P 20 carbide at least in the range from 190 to 350 in Brinell hardness of work materials.抄録全体を表示PDF形式でダウンロード (1224K) -
竹尾 省二, 沖野 教郎1978 年 44 巻 519 号 p. 307-313
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes an effective method for smooth interpolation from arbitrary data points. This method is remarkably usef ul when the data points are randomly distributed, concentrated locally, or contain an error caused by measurement. The algorithm is divided into two steps. First, arbitrary data points are replaced by grid points using an elastic net approximation. This elastic net is a frame structure whose nodes are known data points and unknown grid points. In the process of grid point replacement, the elastic net which approximates the surface is deformed and this deformation, or in other words, unknown grid points are calculated by techniques of structural analysis. This replacement, based on the elastic theory, gives reasonable grid points in the view of smoothness. Second, the inside of each rectangular mesh is interpolated by Coons' patch. As a result of many experiments, it is confirmed that resulting surface is smooth and fair. In comparison with McLain's method, which estimates the grid points using a distance-weighted least-squares approximation, this method gives more fair surface. For practical use, a computer program based on this study has been integrated with Computer-Aided Design processor TIPS-1.抄録全体を表示PDF形式でダウンロード (1260K) -
有限要素法によるシミュレーション平尾 政利, 村田 良司, 竹山 秀彦1978 年 44 巻 519 号 p. 314-319
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThe stress distribution of simplified two-dimensional models of sintered carbide which is composed of tungsten carbide grains and cobalt matrix is microscopically analyzed by finite element method while varying the structural parameters of sintered carbide such as shape, inclination angle of hard grain, average thickness of soft matrix, etc. With square hard grains, the principal stress both in the hard grain and soft matrix becomes maximum when the inclination angle is approximately 15 deg. in reference to the loading direction. When the hard grain is triangle, the smaller the vertical angle, the higher the principal stress is. As the average thickness of soft matrix becomes thicker, the principal stress in the center of soft matrix decreases. The analysis has also revealed that the stress within the soft matrix is more severely localized in the vicinity of the interface between the hard grain and the soft matrix. The analysed results will be applicable for the sintering technology of carbide.抄録全体を表示PDF形式でダウンロード (1094K) -
ねじ軸の曲げ変形を考慮した場合下田 博一, 井沢 実1978 年 44 巻 519 号 p. 320-325
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThe load distribution in the ball screw, when the nut is loaded by the moment, is analyzed theoretically considering the bending deformation of the screw shaft. And the results are compared with the previously reported results which are obtained when the deformation of the screw shaft is not considered, moreover the results are ascertained experimentally by the photo-elasticity using two dimensional ball screw model. In brief, the obtained results in this paper are as follows.
(1) Distributed loads in the ball screw are greater by 10% in maximum than the loads calculated from the linear approximate equation, and the bending deformation of the screw shaf t exerts great influence upon the distributed load acting on the ball of the nut end.
(2) An increase of shaft diameter and a decrease of screw lead are effective to reduce the maximum distributed load in the ball screw.
(3) For the purpose of reducing the distributed load in the ball screw, it is desirable to make the radial loads act on the ball screw regarding to the nut symmetrically, and if possible to diminish the moment load acting on the ball screw.抄録全体を表示PDF形式でダウンロード (1188K) -
砥粒と被削材の適合性に関する研究(第8報)松尾 哲夫, 北川 実1978 年 44 巻 519 号 p. 326-332
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThe study of the abrasive grains for heavy belt grinding has attracted considerable attention. In the present study the pin-on-disc wear test has been made on several single grains for application to heavy belt grinding, such as the roasted alumina, the eutectic 43% zirconia, etc. at speeds of 300 to 1500 m/min using S 55 C and SUS 304 steel discs. Mainly, the dependence of grain wear rate on sliding velocity was discussed from the result of scanning electron microscopic observation of the worn surface of grain. The wear rate of grain increases exponentially with increasing sliding velocity for the S 55 C steel disc. The heat generated at high sliding speed will increase the adhesive wear. The 43% zirconia grain gives the lower grain wear rate than the ZS-zirconia grain, specially at low speed range. The minimum grain wear rate is found at a speed of about 900 m/min for the SUS 304 steel disc, regardless of grain type. The 43% zirconia grain shows the higher wear rate than the ZS-zirconia grain at low speeds.抄録全体を表示PDF形式でダウンロード (1986K) -
メカノケミカルポリシングの研究(第1報)唐木 俊郎, 河西 敏雄1978 年 44 巻 519 号 p. 333-338
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーGGG single crystals used for a magnetic bubble device were polished mechanically and chemically, and the effects of polishing solutions were investigated experimentally. Results obtained are as follows:
(1) The stock removal in mechano-chemical polishing using 1 N H2SO4 solution and 1 μm-Al2O3 powders at 20°C is higher than when using 1 N HCl solution. On the other hand, the etching rate by 1 N H2SO4 solution is lower than that by 1 N HCl solution at 20°C, and is reversed in temperatures about 80°C. The temperature at the work surface in mechanochemical polishing is found to be 70-160°C, according to the Arrhenius equation.
(2) The stock removal using 3 N H2SO4 solution and 0.2 μm-Cr2O3 powders is about 1.5 times as large as the stock removal when using the same solution and 1 μm-Al2O3 powders, although Cr203 powders are smaller and softer than Al203 powders. The mechano-chemical polishing force using 0.2 μm-Cr2O3 powders and polishing solution is larger than the case of 1 μm-Al2O3 powders. It is related to the stock removal by chemical action in mechanochemical polishing.抄録全体を表示PDF形式でダウンロード (1385K) -
工具面性状の影響時沢 貢, 室谷 和雄, 及部 知行, 堂田 邦明1978 年 44 巻 519 号 p. 339-345
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThe extrusion tools can be easily split along the tool-metal interface as in a previous paper, and also the bearing chips set in the tools are designed to be exchangeable. The effects of the tool surface on the surface quality of extrusion products are examined, and the frictional mechanisms are investigated by electron probe microanalysis.
(1) By the bearing chips of nitrided tool steel (N) and cemented carbide metal (G2), the contact mechanism at the tool-metal interface is slip friction, and the bearing surface is covered with adhesion of thin films composed mainly of Al and Mg. The products surface becomes the finest one.
(2) By the five bearing chips of G2, N and tool steel (SKD 61), and with the carbide layers of TiC and VC on the tool surface, where chips surface is vertically ground to the extrusion direction, the materials adhered to fill up the grinding grooves are Al, Mg and Fe. The products surface is inferior to the cases of above result (1).
(3) By the three buff-polished bearing chips of SKD 61, and with carbide layers of ere and TiC, the contact mechanism is stick friction. The adhesion grows into a band-like shape, and after its peeling off, the products surface becomes rougher than the second results. The main components of adhesion are Al and Si, and Fe and Si segregate on the products surface.抄録全体を表示PDF形式でダウンロード (1516K) -
木下 夏夫, 新井 民夫1978 年 44 巻 519 号 p. 346-351
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes the analysis of plug insertion process by an assembly machine which consists of a rigid hand and a work fixture supported by springs. From the viewpoint of the rigidity of machine structure, assembly machines are classified into three types : rigid, elastic and free structure. It is impossible for the rigid structure machine to insert a plug into a hole whenever the positioning error exceeds half a clearance, but for the elastic one it is possible with the aid of springs which improve the relative position. To study the property of the elastic structure, a static model is constructed and verified by experiments with 20φ plugs. As a result of it, the generated forces between parts, which have been unsolved quantitatively, can be computed as the function of positioning error, posture error and spring constants. So a clue to design and control method is obtained.抄録全体を表示PDF形式でダウンロード (1074K) -
ボブ盤の割出性能評価に関する実験的研究(第1報)柳下 福蔵1978 年 44 巻 519 号 p. 352-358
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーThe measurement of generating accuracy is considerably difficult because of the very low rotational speed of the worktable. So, results of the actual measurement have scarcely been known so far. By employing the rotational speed meter which was newly developed the author has succeeded in recording simultaneously the rotational error of both the worktable and the hobb shaft not only during an idling time but also during machining. The results were analyzed with a real time frequency analyzer and the cause of both rotational errors was inferred by examining their power spectra. As a result, the variational component caused by the working V-belt was recognized in the rotational error of both the worktable and the hobb shaft under the idling condition. While, in the machining condition, the intermittent cutting force caused by hobb's cutting edges causes the rotational error of the worktable. That of the hobb shaft consists of numerous variational components caused by the fiappering of driving gears in the vicinity of the contact frequency of gears. Also, it was newly ascertained that a qualitative coincidence existed between the tooth profile estimated by the measured relative rotational error and the test result of the tooth profile generated by the machine.抄録全体を表示PDF形式でダウンロード (1228K) -
工具摩耗によるバイト振動の研究(第3報)松原 十三生, 中村 義雄1978 年 44 巻 519 号 p. 359-364
発行日: 1978/03/05
公開日: 2009/06/30
ジャーナル フリーTo prevent the tool vibration with worn cutting edge is investigated in this paper. Taking into account the mechanism of tool vibration which has been made clear in the previous report, CT tool (Centered Tip tool) where a cutting edge is set on the bending neutral axis of the tool shank is introduced here to prevent the tool vibration. The interaction of flank wear with workpiece which is main cause of tool vibration as already shown in previous report can be minimized by CT tool and no exciting energy is expected. The experiment shows the strong effect of CT tool on the prevention of tool vibration. It is also shown that the flank wear has a significant effect on the prevention of regenerative chatter, therefore, CT tool with worn cutting edge has a possibility to prevent both tool vibration and regenerative chatter simultaneously.抄録全体を表示PDF形式でダウンロード (1443K) -
山中 寅清, 瀧島 芳之, 相澤 紘1978 年 44 巻 519 号 p. 365-370
発行日: 1978/03/05
公開日: 2009/06/30
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沖野 教郎, 嘉数 侑昇, 久保 洋1978 年 44 巻 519 号 p. 371-379
発行日: 1978/03/05
公開日: 2010/02/16
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中沢 喜和雄, 谷元 昭一, 吉田 庄一郎1978 年 44 巻 519 号 p. 380-385
発行日: 1978/03/05
公開日: 2009/06/30
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1978 年 44 巻 519 号 p. 385
発行日: 1978年
公開日: 2009/06/30
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