巻号一覧
前身誌
24 巻, 142 号
選択された号の論文の14件中1～14を表示しています
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本田 巨範1958 年 24 巻 142 号 p. 331-332
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーPDF形式でダウンロード (451K) -
奥島 啓弍, 湊 喜代士1958 年 24 巻 142 号 p. 333-339
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThis paper describes the behaviour of chip in the case of steel cutting for the use of the design of chip breaker, and contains the following two parts. The first half describes the flow-out angle of chip, and that the values for the flow-out angle of chip calculated by the approximate theoretical equations accord with the measured values for various cutting conditions and tool designs, so that the authors draw up the nomograph for the flow-out angle of chip on the basis of the theoretical equations. The latter half describes the chip classification and the effect of cutting conditions on the shape of chip.抄録全体を表示PDF形式でダウンロード (1094K) -
古市 亮蔵, 田中 行雄1958 年 24 巻 142 号 p. 340-344
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーWe have done some grinding experiments using various kinds of emulsion type grinding fluids on the basis of spindle oil. In this report, we have considered the relations between grinding ratio, tangential grinding force, the wearing state of the grinding wheel and the rate of dilution of the grinding fluid. And then considered the effects of some additives. As a result, we have made clear that the grinding ratio decreases, the tangential grinding force increases and the wearing rate of the grinding wheel increases along with the increase the rate of dilution of grinding fluid. Usins the emulsion containing no additives, in the case of tractical rate of dilution, its effects approach to the case of using water alone. Generally, containing relatively high percentage of additives, the effects of the grinding fluids are significant.抄録全体を表示PDF形式でダウンロード (876K) -
八木 明1958 年 24 巻 142 号 p. 345-349
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThe carbon content of the tyre on which the test was conducted was somewhere around 0.69% and that of rail mached with the tire were three kinds, 0.37%, 0.57% and 0.71%. The test was conducted for two different cases, i. e. Case 1, Both rail and tyre are not hardened. Case 2, One of them is hardened. Test was carried out in dry condition as well as in lubricated condition, using an Amsler-type abrasion testing machine. The following is a test result : 1) When both untreated and in dry condition, in case of the carbon content of rail is much more than tyre, the abrasion of former is less than the latter. 2) Under dry condition, the exreriment on the case, where the rail alone is hardened, has revealed that the low carbon steel (C 0.53%) is more effective than the high carbon steel (C 0.71%) 3) Under the lubricated, if either rail or tyre is hardened, the effect is so remarkable in all combination.抄録全体を表示PDF形式でダウンロード (769K) -
千住 鎮雄1958 年 24 巻 142 号 p. 350-355
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーSometimes a repairman takes care of several automatic machines which normally require no human care, but are liable to stop at random intervals and then require the repaiman's service, for a certain period of time before restarting. In the study of the effect of the synchronization time, or the time lost while a stationary machine is waiting for attention, the walking time from one machine to the next stopped one cannot be neglected, especially when an operative attends a large number of machines. In this paper the relation between the average walking distance and the layout of machines, which have different probability to stop, are dealt with in the case when no definite order of attention is specifled, and the optimal way of operating machines is discussed when ancillary work is too much to be handled while the operative is free from repairing.抄録全体を表示PDF形式でダウンロード (821K) -
千住 鎮雄1958 年 24 巻 142 号 p. 357-360
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーWhen an operative takes charge of several machines which require his attention at random intervals, there are two types of patrolling : one of them is the "regular" one, whereby he tends machines according to a fixed pattern, and the other is the "irregular" one where no difinite order of attention is specified. The walking time of the operative and the productivity of machines or the duration of wrong state of machines vary with the method of patrolling. In this paper, the walking time of an operative, the time interval of his patrolling, the average productivity of machines and the average duration of wrong state of machines are compared from the probability's point of view with respect to the two types of an operative's patrolling.抄録全体を表示PDF形式でダウンロード (639K) -
千住 鎮雄1958 年 24 巻 142 号 p. 361-365
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThe distributions of continuous running time of machines and repairing time of each break-down of machines in spinning mills are examined. Actual availabilities of various kinds of machines in spinning mills are compared with their theoretical values derived before, and when there are great differences between them, the reasons are discussed.抄録全体を表示PDF形式でダウンロード (733K) -
佐々木 外喜雄, 森 美郎, 平井 昭好1958 年 24 巻 142 号 p. 366-371
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThe load capacity of hydrostatic bearings can be increased by making a pocket which keeps effective fluid pressure on the bearing surface, and their dynamic stability can be improved by arranging a suitable restrictor like a capillary or an orifice which corresponds to the bearing dimensions and the optimum clearance in the fluid supply-line. In this report, concerning three types of thrust bearings which have the bearing surface of sphere, disc or cone, the theoretical solutions of rressure distribution, quantity of flow, load capacity and power consumption are obtained. Depending on the above solutions, it is clarified that the bearing clearance should be determined by the dimensions of the restrictor. Therefore, the desiging factors of the bearing concerning the clearance, the restrictor, the pocket and supplying fluid pressure have been investigated taking into consideration the conditions of the best dynamic stability, the maximum load capacity and the minimum power consumption.抄録全体を表示PDF形式でダウンロード (965K) -
佐々木 外喜雄, 岡村 健二郎1958 年 24 巻 142 号 p. 372-376
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーFor the purpose of improving the cutting performance of fine-grain abrasive stones and inquiring into the cutting mechanism in the honing, the experimental research has been carried out with an external honing apparatus under various working conditions such as cutting speed, cutting direction angle, abrasive stone pressure and bond hardness. Concerning the cutting speed of stone, the best cutting efficiency is obtained at a cutting cspeed of 40m/min. The cutting direction angle of 40°∼50° is the most suitable, because the maximum stock removal, minimum stone wear and the smothest honed surface are obtained in this range of angle. Also the cutting direction angle is the most decisive factor in cutting mechanism of honing. As to the bond hardness, the harder the stone, the higher the cutting efficiency. Comparing the honing with the superfinish, the most suitable values of cutting direction angle and cutting speed are same in both cases. But the cutting efficiency of superfinish is 5∼10 times that of honing, and the stone wear per unit amount of stock removal of honing is slightly smaller than that of superfinish.抄録全体を表示PDF形式でダウンロード (745K) -
佐々木 外喜雄, 岡村 健二郎1958 年 24 巻 142 号 p. 377-381
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThe depth of cut for the individual abrasive grains and the cutting resistance affecting the individual cutting points that are produded in honing or superfinishing operations are important factors to investigate the cutting mechanism of fine-grain abrasive stone. But above factors depend on the number of cutting points on the stone surface which comes to contact with the work surface. In this paper, the contact mechanism of stone and work has been investigated theoretically in order to obtain the number of cutting points. Then the number of cutting points and maximum depth of cut are obtained as the fanections of the roughness of stone sarface, the pressure on the stone and the hardness of work material.抄録全体を表示PDF形式でダウンロード (727K) -
佐々木 外喜雄, 岡村 健二郎1958 年 24 巻 142 号 p. 382-386
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーThe theory by which we obtained the number of cutting points on the stone surface which comes to contact with the work surface was discussed in the first report. For checking the validity of this theory, the mean derth of cut (tm)th which can be found with the theoretical investigation of the contact mechanism is compared with the mean depth of cut (tm)ex which can be obtained from the stock removal per unit time and the number of cutting points on the stone surface in the superfinishing operation. As the results of this comparison, the following conclusions were obtained.(tm)th is larger than (tm)ex at all times. However, it is clarified that the contact theory mentioned before is right if the cause of the difference between (tm) <th> and (tm)ex is taken into consideration. Then, it is validated that the theoretical equation of the number of cutting points is recognizable by inquiring that the cause of the difference between (tm)th and (tm)ex influences on the number of cutting points.抄録全体を表示PDF形式でダウンロード (797K) -
佐々木 外喜雄, 岡村 健二郎, 円井 忠雄1958 年 24 巻 142 号 p. 387-391
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーFor investigating the cutting mechanism of fine-grain abrasive stone theoretically, it is necessary to find the value of the cutting resistance affecting on the individual grains. In this report, the experimental research has been carried out on the cutter which resembles the cutting point of grain in shape. The conclusions reached are as follows : (1) The ratio of the horizontal component to the vertical component of the cutting resistance is determined in conformity to only the shape of cutting point, and the value of this ratio is 0.4∼0.6.(2) The specific cutting resistance defined as the ratio of the horizontal component of the cutting direction is obtained as the exponential function of the depth of cut.(3) The cutting speed has no influence on the specific cutting resistance.(4) Comparing the above mentioned single cutting point test with the actual finishing operation with the fine-grain abrasive stone, it is found that the relationship in the single cutting point test between the death of cut for the cutting point and the cuttins resistance is well agreed with that in the actual finishing operation.抄録全体を表示PDF形式でダウンロード (831K) -
松山 徳蔵, 萱場 孝雄1958 年 24 巻 142 号 p. 392-397
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーIn this paper, a study of the electro-spark machining process by the alternating current in the circuit used by Lazarenko is described. The results of this investigation are as follows : With the alternating current, the machining speed is maximum and in the widest extent of the working current machining is stable, using a solid brass bar electrode. The larger the condenser capacity is, the wider this extent becomes, and the larger the working current grows, at which the machining speed is maximum as same as in the case of direct current. Regardless the condenser capacity, the electrode consumptions are almost constant under a certain working current, which is largest when a solid brass bar electrode is used. Under a certain diameter of electrode, machining speed is little affected by it. The clearance between hole and electrode is also little influenced by the working current, if it is beyond a certain value.抄録全体を表示PDF形式でダウンロード (1049K) -
岩本 貢, 菊池 初太郎, 内藤 俊雄1958 年 24 巻 142 号 p. 398-403
発行日: 1958/06/25
公開日: 2008/03/28
ジャーナル フリーVarious observations and considerations on the fluctuation of rotational angular velocity of the main spindle supported in the plane bearings of a common lathe were made by measurements with an optical system, with the following conclusions. The fluctuation is caused by different factors in the high speed and the low speed regions. In the former, primary torsional resonance is caused by the natural torsional frequency of the main spindle and the driving system as a whole and the period of variation of rotational torque due to the teeth of spur gears driving the main spindle. In the latter, fluctuation of rotation takes place invariably from the insufficient exactitude of profile of the rotating part attached to the main spindle ; further, the variation is erratic on account of small rotating moment. To control such variations, it is effective to increase the number of reducing stages from the main motor to the main spindle, but harmful for the smooth rotation of spindle under low speed.抄録全体を表示PDF形式でダウンロード (1071K)
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