巻号一覧
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42 巻, 494 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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ブルドン管圧力計に関する研究(第4報)高橋 一雄, 古川 浩1976 年 42 巻 494 号 p. 164-170
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe accuracy of the Bourdon tude pressure gauge depends on the mechanical properties of its material, the methods and the conditions of its forming. To produce the precise Bourdon tube it is required that the accuracy of the forming machine is very good. And also, it is important to produce the precise profile in the manufactured goods. To decrease the dimensional errors of each part of the flat-oval cross-section, according to many oxperimental results, it is evident that the flatness of the core, which is inserted into the tube, is less than 10 μm. And if the error of the gap between both rollers of the bender is larger than 1 μm, the accuracy of the Bourdon tube is suddenly lost. From these reasons, the results which is required that the parallelism of each roller is less than 1 μm for the whole length of the rollers are obtained. This paper deals with the design of precise bender with three rollers to produce super-precise Bourdon tube with 0.04% errors. The measurement of the bending forces using this precise bender is achieved and the errors of the Bourdon tube with the flat-oval cross-section, when this machine is used, are also experimentally obtained.抄録全体を表示PDF形式でダウンロード (1530K) -
ねじ軸およびナットに引張荷重あるいは圧縮荷重が作用する場合,ならびにナットに引張り,圧縮両荷重が作用する場合下川 博一, 飯島 福雄, 井沢 実1976 年 42 巻 494 号 p. 171-177
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, the load distribution states of the ball screw have been investigated about the case of which the axial tension or compression acts on the shaft and nut and on the case of which both tension and compression act simultaneously on the nut. The relations among the distributed loads, dimensions and shapes of the ball screw also have been analyzed theoretically and discussed as compared with the results of 1st report. Further, these theoretical results were confirmed by means of the experiments using two dimensional photoelastic model of ball screw. The main results obtained are as follows.
(1) The load distribution in ball screw when the tension or compression acts on shaft and nut is more uniform than the one of 1st report of which the tension and compression act on them respectively.
(2) In the case of this study, it is very effective to uniform the load distribution when the cross section areas of the shaft and nut are made equally.
(3) The ratio of minimum distributed load to maximum one of the experiment is constantly about 60% regardless of amount of the external load, moreover the difference between maximum distributed load and minimum one is proportional to the external load.抄録全体を表示PDF形式でダウンロード (1331K) -
山本 明, 松森 昇, 上田 隆司1976 年 42 巻 494 号 p. 178-183
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーA splintery grain which is obtained at the early stage of milling process has comparatively slender appearance and sharp cutting edges, but is considerably friable due to existing crystal defects. With the view of positive utilization of this grain's feature, this paper reports on its cutting performance and the effectiveness when applied to the materials of poor grindability producing severe loading. One of the characteristics of honing work is that it exhibits remarkable differences in behaviors of cutting and stick wear at stick pressures before and after the critical pressure Pc, which is mainly attributed to the relation in magnitude between exerting cutting force on the acting grain and its strength. Comparison was made between two vitrified sticks of WA 150 having the same hardness which are made of the splintery grain S and the blocky or mulled grain R of special make, respectively. Generally, in the finishing of steels, for example, the stick S has pretty low Pc and excessive stick wear at Pc and therefore is of no benefit. But, a little crosshatch angle can suppress grain fragmentation, and consequently makes stick wear close to the level of the stick R. In the finishing of aluminum the stick S is superior at stock removal, stick wear and surface roughness. Also in that of austenitic stainless steel, the treated stick S (S) covered the friable grain by plugging the pore with sulfur somewhat surpasses the treated stick R(S).抄録全体を表示PDF形式でダウンロード (1383K) -
貴志 浩三, 江田 弘, 市田 良夫1976 年 42 巻 494 号 p. 184-190
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper describes some considerations at the three dimensional observation of a built-up-edge in Al-Si and Fe-C alloys. This study mainly makes clear up the effects of the secondary phase grains (Si and Fe3C), the diameter of the crystal grains and other alloy grains (Al2Cu, Mg2Si and A13Ni, etc.) on the external appearance and internal structure of the built-up-edge. For that purpose, the built-up-edge is sufficiently investigated by use of the scanning electron microscope (SEM) and X-ray diffraction apparatus. Main results obtained are as follows.
(1) The built-up-edge is formed by the cohesion of, the unit elements of the arborization shape.
(2) The fallen fragments into the back face of a chip and machined surface do not lie over the cutting width as if trump cards were pushed and downed, but split from the arborization unit of the built-up-edge at random to the chip and machined surface. And the split occurs near the tip of the built-up-edge.
(3) The secondary phase grains (Si, Fe3C) and other alloy grains (Al2Cu, Al3Ni and Mg2Si) are crushed finely in the external surface as well as the internal structre of the built-up-edge.抄録全体を表示PDF形式でダウンロード (3075K) -
疲れによる定常摩耗の解析鏡 重次郎, 山田 国男, 武田 信男, 直井 貞司1976 年 42 巻 494 号 p. 191-196
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe analysis of steady wear mechanism is carried out by the fatigue theory as rate processes under the condition that the asperities on sliding surfaces are contacted elastically one another. The main results obtained are as follows:
(1) If the sliding velocity is relatively low and the temperature rise at the contacts is not so high, the wear is essentially proportional to the sliding time.
(2) The wear is increased rapidly with the sliding velocity due to the temperature rise. Then the wear rate which is defined as the wear per unit sliding distance, is minimized at the critical sliding velocity.
(3) In relatively small range of load, the wear rate increases proportionally to the load but increases abruptly in larger range.抄録全体を表示PDF形式でダウンロード (1126K) -
久保田 護, 田村 祐二, 島村 則安1976 年 42 巻 494 号 p. 197-202
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe new ultrasonic machining is studied experimentally and its characteristics are found out. Experiments are performed in three ways: 1. Glass plate drilling by an ultrasonic machine tool with a turn table. 2. Glass rod turning by a lathe with an ultrasonic vibrating tool on the carriage. 3. Glass plate drilling by an ultrasonic vibrating rotor tool. Influences of working conditions such as grain size, tool amplitude, relative motion speed, and working pressure on the removal rates are obtained. The result of the experiment enables' to make a new ultra-sonic machining rotor tool for an NC milling machine. In conclusion : 1. Relative motion of the tool and the work with a suitable speed is necessary for this process. 2. Stock removal rate depends on the working conditions and in case of glass plate drilling it reaches to 50 mm/min. 3. Tool wear is only 0.01% in length.抄録全体を表示PDF形式でダウンロード (1427K) -
初透磁率の加工法による変化木下 正治, 村山 智一1976 年 42 巻 494 号 p. 203-208
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe magnetic properties of Mn-Zn single crystal ferrites which are used for VTR magnetic heads are very sensitive to machining. The machining processes are performed such as slicing, lapping and polishing on (110) and (100) planes of the toroid samples to investigate the effects on magnetization process. The frequency characteristics of initial permeability is measured to give the permeability dependency on degree of machining processes, such that the sliced toroid has higher permeability than the lapped one and gives rather comparable value with the polished toroid. The reduction of the sample thickness from 0. 5 mm to 0. 2 mm results in flattening the frequency characteristics. Comparison of the permeability of the etched toroid with that of the machined one gives the large permeability reduction in the low frequencies and the small reduction in high frequencies for the machined toroid, which suggests the magnetization of domain wall displacement would be disturbed by machining. The difference of permeability recovering curves due to etching among machining processes leads the idea that the changes of magnetization processes are different.抄録全体を表示PDF形式でダウンロード (1174K) -
電流効率について能戸 幸一, 奥平 弘明1976 年 42 巻 494 号 p. 209-214
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe effects of current densities, electrolyte temperature and wave forms of applied voltage on the current efficiencies were experimentally investigated in Electro-Chemical Machining using sodium nitrate solution. The results are as follows.
(1) The current efficiencies increase continuously from zero percent to the approximately constant value as the current densities increase. The current efficiencies in the region of the lower current density have the lower value, and increase critically over the region of these current density and at the higher current density increase to the approximately constant value.
(2) The current efficiencies at the high electrolyte temperature are lower than the ones at the low electrolyte temperature and have the critical increase rate at the higher current density than the ones at the low electrolyte temperature.
(3) The current efficiencies by the single phase full wave rectification or the three phase half wave rectification are lower than the ones by the three phase full wave rectification. These current efficiencies can be numerically obtained from the current efficiencies curve of the three phase full wave rectification.抄録全体を表示PDF形式でダウンロード (1313K) -
今非 秀孝, 飯塚 幸三1976 年 42 巻 494 号 p. 215-220
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーThe spring limit test is utilized as a practical testing method for the evaluation of mechanical characteristics of metals for springs. However, the spring limit value Kb for representing the characteristics is defined in a conventional manner and the effects of the testing conditions on the value have not been investigated. In this paper, a new testing method in terms of the up-and-down method and linear regression analysis is proposed and the effects of the testing conditions on Kb value measured by the cantilever method are investigated. It is revealed that the free length of the cantilever must be 80-150 times of the thickness of the specimen in order to have correct values. The relation between the maximum bending stress and the permanent deflection can be assumed to be linear within the range of Kb±10σK (σK; the standard deviation of Kb). By this new method, the spring limit value Kb can be estimated without the strain history. The accuracy of the estimated value of Kb is about ± 1.0% (95% confidence interval) when the number of specimens is 15.抄録全体を表示PDF形式でダウンロード (937K) -
鳴瀧 則彦, 村越 昭男1976 年 42 巻 494 号 p. 221-226
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーTurning test was run on Ca-Si deoxidized steel, free cutting steel and normal carbon steel in order to examine the effect of non-metallic inclusions in steels on the wear of ceramic tools. The wear patterns, the wear rates and the tool life were measured and the adhered material on the tool worn surface was analyzed by an EPMA. Also, the reaction between the oxide inclusions and ceramic tools was examined by reaction tests and the relation between these data and the wear of ceramic tools was considered. The test results obtained are as follows:
(1) The life of ceramic tools in machining of Ca-Si deoxidized steel is shorter than that of normal carbon steel. This fact is completely opposite to that of carbide tools. And Ca and Si are detected on the worn surface of the ceramic tools which machined Ca-Si deoxidized steel.
(2) CaO or SiO2 reacts with ceramic tool and Ca or Si invades into ceramic tool by diffusion. and softens the tool matrix. The reaction of Ca is more predominant than Si and the distance of Ca invasion to the tool is larger than. that of Si.
(3) MnS type adhesive layer on the tool surface pr'otects the wear of ceramic tool effectively and prolongs the tool life.抄録全体を表示PDF形式でダウンロード (1104K) -
藤村 善雄, 河端 裕, 吉澤 徹, 山階 正樹1976 年 42 巻 494 号 p. 227-233
発行日: 1976/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1446K)
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