巻号一覧
後続誌
40 巻, 475 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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プレナール E., 舟久保 熙康1974 年 40 巻 475 号 p. 625-632
発行日: 1974/08/05
公開日: 2010/05/07
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森 昌幹, 久米原 宏之1974 年 40 巻 475 号 p. 633-638
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, as one of the main factors generating roughness of machined surfaces, the fidelity of replica of roughness of cutting edges to the machined surfaces has been experi-mentally studied. It is assumed that the process of the roughness generation may constitute a linear system in which profiles of cutting edges and those of the machined surfaces can be shown as random signals of input and output respectively, and power spectrum, frequencygain characteristic, cross-correlation coefficient and depth of over-cut coefficient of these signals are calculated to appreciate the effect of machining conditions on the fidelity of replica. The experimental results in turning with cemented carbide tools show that the fidelity of replica depends on properties of work materials and cutting conditions. For example the fidelity of replica is high to copper, brass and duralumin but low to carbon steel, also high under small depth of cut with high speed. Judging from the results, it is considered that the fidelity of replica may be lowered by occurrence of built-up edge, tearing of work materials and others抄録全体を表示PDF形式でダウンロード (2950K) -
切れ刃分布安井 平司, 津和 秀夫1974 年 40 巻 475 号 p. 639-644
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーThis study is carried out as the initial stage of the studies which are done in order to analyze quantitatively the variation of the working surface of grinding wheels in grinding. In experiments, the cutting edge ratio and the distribution of cutting edges are directly measured with a microscope in the dressing process for several dressing conditions. Furthermore, the variation of the density and the distance of cutting edges in grinding are examined in detail. The cutting edge ratio and the distribution of cutting edges are found not to vary in the dressing process over a sum of the dressing depth in the case of repeating the same dressing. In the grinding process except the initial stage, it is cleared that the density of cutting edges is nearly constant and the distance of cutting edges decreases as the stock removal increases. From these results, it is considered that the density of cutting edges is determined by specifying the dressing condition and the variation of the working surface of the grinding wheel in grinding is regarded as the wear process of cutting edges.抄録全体を表示PDF形式でダウンロード (1180K) -
フレッティング摩耗に関する研究(第2報)大前 伸夫, 築添 正1974 年 40 巻 475 号 p. 645-650
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーThe influence of slip amplitude on fretting wear was investigated. It seems that the amplitude of relative slip could be regarded as an essential factor which affects the fretting mechanism, not only because fretting is caused by the relative slip between surfaces of metal members, but also because considerable reduction in fretting damage can be made by minimizing the slip amplitude. When a series of wear experiments of mild steel is carried out with area contact, it becomes evident that the wear volume is dependent upon the slip amplitude. To clarify this phenomenon, measurements of frictional coefficient, electrical contact resistance and adhesive coefficient should be made. It was found that the so-called "fretting corrosion" is the phenomenon which takes place below the slip amplitude of about 70μm. In this region, the characteristic evidence of oxidative wear can be recognized; frictional coefficient is low about 0.6, electrical contact resistance is higher around 20Ω and adhesive coefficient is of lower value of about 1×10-3. At larger slip amplitudes than about 70μm, it can commonly be observed that frictional coefficient becomes as high as 0.8, that electrical contact resistance is low about 1Ω, and that adhesive coefficient is of high value of about 6×10-3. At above the slip amplitude of about 70μm, mechanical types of wear (adhesive wear and abrasive wear) and the oxidative wear might be acting simultaneously, so that the wear process could tribologically be called as the "fretting wear."抄録全体を表示PDF形式でダウンロード (6589K) -
単結晶フェライトヘッドの摩耗田中 久一郎, 三好 和壽, 荒木 洋道, 村上 智一1974 年 40 巻 475 号 p. 651-657
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーMeasurements were made on the wear of VTR head made of ferrite single crystal in a two head helical scan type VTR. The {110} plane was used as the frictional surface of head. A deformed layer produced near the worn surface of head after the sliding against magnetic tape was studied by an electron diffractometry of a model-head of 1.2mm width. The wear of various crystallographic planes was also studied in the sliding of model-head against a lapping tape. It is found that the wear depth of head increases proportionally with the increases of sliding distance and protruding height of head. The change of shape of head occurs in the wear of the head sliding against magnetic tape, which it little occurs in the case of lapping tape. The wear depth at front side of head is generally greater than that at rear side. The wear rate of head is estimated at from 10-9 to 10-10mm3/kg·mm. A very thin amorphous layer is produced near the worn surface of head. In addition, there exists a deformed crystalline layer underneath the amorphous layer. The thickness of deformed crystalline layer is about 0.6μm. It seems that there is little difference of wear resistance with respect to crystallographic planes.抄録全体を表示PDF形式でダウンロード (3455K) -
回転・曲げ・引張強さの比較山本 明, 佐野 高男1974 年 40 巻 475 号 p. 658-665
発行日: 1974/08/05
公開日: 2010/02/16
ジャーナル フリーIn the high speed grinding with the object of high production in grinding works, the security from bursting of rotating wheels is strongly claimed. This paper deals statistically with the fracture, especially the delayed fracture that is remarkable in brittle materials such as the vitrified wheels, and experimental data are settled by the Weibull plot. The strength at ordinary test which breaks during load increasing and that at static fatigue test which looks for the time before fracture under a constant load are compared among tensile, bending and rotating test. At the ordinary test, the location parameter γ≠0 and the shape parameter m>1. The value of m and the mean strength μ are both largest in bending test, and rotating and tensile test follow in its train. At the fatigue test, the constant load is defined with the loading factor S that is the reciprocal of the safety factor and S=0.881.08. Results of these tests point out that γ≠0, m<0.8 and the descending order of its magnitude is rotating, bending and tensile test and that m decreases to approach a finite value as S decreases. The static fatigue phenomenon is conspicuous in the same order as m and the delayed fracture one in the reverse order. By assuming that m=constant and S-characteristic life relationship the assured safety life from bursting is estimated for S=1/4 provided by the "Safety Code." This time is sufficiently safe compared with the engaged time of the wheel.抄録全体を表示PDF形式でダウンロード (1336K) -
インボリュート歯形の円弧近似法津田 展宏, 石川 二郎, 福田 康正1974 年 40 巻 475 号 p. 666-671
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーIn a mechanism which grinds a gear by means of a form-shaped grind wheel, it's possible to set a grinding wheel dressing device and an index head independently. Therefore this mechanism is simplified in comparison with generating one by a grind wheel remarkably. But, in the process of form grinding, the dressing attachment is required which dresses any desired tooth form modification accurately and efficiently. First, it's the purpose of this paper to obtain the circular arc which is a fairly good approximation to an involute curve secondly to manufacture a simple designed dressing attachment which forms a grind wheel along above mentioned circular arc, and to grind a high precision gear by means of a form-shaped grind wheel by this one. The approximate arc is obtained by the least squares method, by which it's possible to obtain the specification of the circular arc which holds to a fairly good approximation easily, in addition, to adapt to modified profiles. In an experiment, the grind wheel is formed by the dressing attachment which is moving on a circular arc and tooth spaces were grinded by the form-shaped grind wheel. The results of profile measurements show the deviation from calculated values and experimental ones are within 4μm. It is assured that the accuracy of a combination of a polygon mirror and an autocollimator which is used as indexing device is copied to a work gear exactly.抄録全体を表示PDF形式でダウンロード (1042K) -
突起面密度および突起頂点分布に関する解析鏡 重次郎, 山田 国男, 武田 信男, 直井 貞司1974 年 40 巻 475 号 p. 672-677
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーThe methods for obtaining the surface density of asperities and the real distribution of asperity heights, which differs from the distribution appearing on the surface profile curve, are considered about the isotropic and anisotropic surfaces. In the cace of the isotropic surfaces, the asperities are assumed to be spherical at least near summits. Then the surface density of asperities and the real distribution of asperity heights are obtained from the number of the peaks within a defined land length of the surface profile curve, the distribution of the peak heights appearing on it, the mean base radius of the spherical asperities, the distribution of the effective asperity heights and so on. In the case of the anisotropic surfaces, the asperities are assumed to be ellipsoidal at least near their summits. Then the method is derived with which those ellipsoidal asperities are replaced by spherical asperities which are equivalent to the original ones.抄録全体を表示PDF形式でダウンロード (990K) -
高田 祥三, 小尾 誠, 佐田 登志夫1974 年 40 巻 475 号 p. 678-684
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーThe geometrical error of the workpiece in turning operation is analysed experimentally in this paper. The experiment reveals that nearly a half of the error is due to thermal expansion of the tool tip and the holder and that the rest comes from the thermal expansion of the workpiece, the deflection of the workpiece and the tool post, the geometrical error of the machine tool and the tool wear. Each error component can be obtained quantitatively by the measurements of displacement of the tool, workpiece and tool post during cutting. Cutting experiments show that the thermal expansion of the tool and the deflection of the workpiece become large with the increase of the depth of cut and feed, while they decrease with the increase of cutting speed. Use of cutting fluid restrains thermal expansion of the tool and workpiece, leading to higher accuracy of the workpiece.抄録全体を表示PDF形式でダウンロード (1339K) -
岡村 健二郎, 松原 十三生, 山下 彰夫1974 年 40 巻 475 号 p. 685-687
発行日: 1974/08/05
公開日: 2009/06/30
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森 吉雄, 保科 直美1974 年 40 巻 475 号 p. 688-693
発行日: 1974/08/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (2373K)
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