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46 巻, 11 号
選択された号の論文の19件中1～19を表示しています
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中川 威雄, 戴 豊樹, 天野 富男1980 年 46 巻 11 号 p. 1331-1337
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (5339K) -
工作機械構造の接合面の動特性に関する基礎的研究(第4報)久米 靖文, 橋本 文雄1980 年 46 巻 11 号 p. 1338-1343
発行日: 1980/11/05
公開日: 2010/02/16
ジャーナル フリーThe serial studies aim to reveal the torsional damping of the joint of machine tool structure, and the present paper discusses, in particular, the case when the contact surfaces are in adhension. For this purpose, the damping of the coupling model composed of a disc and a cylindrical pipe is obtained theoretically and experimentally for the case when their contact surfaces stick together by an axial pre-load. The damping is analyzed with regard to. the resonant modal shape of the cylindrical pipe, assuming it coincides with the material damping of the cylindrical pipe. On the other hand, the damp-ings which were obtained experimentally could qualitatively explain the theory, hence it is con-cluded that the torsional damping of the structure which possesses the sticked contact surfaces may be estimated from only the material damping of the structure and the effect of the sticked contact surface could be ignored.抄録全体を表示PDF形式でダウンロード (1095K) -
気孔が破壊強度に及ぼす影響本間 恭二1980 年 46 巻 11 号 p. 1344-1350
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe extended Griffith's Maximum Stress Criterion for porous brittle materials, proposed by Babel et al., predicts a compressive strength of any value from three to eight times the tensile strength depending on the morphology of the elliptical holes. Based on the criterion, the effects of pores in vitrified grinding wheels as well as in alpha plaster on the fracture strength have been investigated. Specimens were carefully prepared and subjected to conventional tensile and compressive tests in order to presume the morphology of an equivalent elliptical pore, as well as to determine macroscopic biaxial criterion expressions. Ratios of the compressive to the tensile strength for five different grinding wheel specimens tested lied between 4. 8 and 6. 2. The results suggested that the equivalent pore in the materials might be regarded as open cratks of less sharpness. Brazilian Disk Tests (diametral compression of a disk) were also performed to investigate the validity of the biaxial criterion. Detailed stress distributions of disks were previously calculated by using the Finite Element Method. The results revealed that biaxial stresses near the center of disk take part in the catastrophic fracture. Predictions based on the biaxial criterion agreed well with observed strength values in disk tests for these materials.抄録全体を表示PDF形式でダウンロード (1229K) -
大久保 信行, 嶽岡 悦雄, 吉田 嘉太郎1980 年 46 巻 11 号 p. 1351-1357
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe dynamic characteristics of machine tool structure including its natural frequencies and resonant modal shapes are measured precisely by the help of modal analysis method with a mini computer. The software system is developed which can identify the amounts of distributed masses, dampings and stiffnesses, and then can analyse which part of the structure may affect upon the resultant dynamics to what degree. In the system a mathematical model can be automatically obtained by giving modal parameters measured and the information with respect to the measuring points and further the simulation of structural modification for improvement of the dynamic characteristic of the machine can be carried out, by use of structural parameters obtained. The method is applied to a vertical milling machine in order to improve the vibrational mode which influences greatly to the cutting capacity of the machine. Comparison with the actual structural modification and computed results of simulation show a good coincidence and also the reduction of vibration at the frequency under consideration is observed in cutting test.抄録全体を表示PDF形式でダウンロード (1572K) -
佐藤 松雄, 高梨 三郎1980 年 46 巻 11 号 p. 1358-1362
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThis report relates to a measuring method for dynamic transmitting error of one pair of gear which are meshing each other at loaded state. In this report, when one side gear shaft rotating at high velocity, advance or lags in relation to the other side shaft, the discrepancy in phase was detected using a gear-shaped condenser, thereby variation of meshing speed was measured. This discrepancy in phase was recorded with digital memory by modulating sawteeth-shaped wave into discrep-ancy in time. The result is summarized as follows: (1) By comparing time series of time signal from rotary scale attached to one side rotating shaft, and time series which is delayed with a certain time in relation to said time series, variation of time interval, i. e. variation of instant speed can be obtained. (2) By applying this method to two rotating shafts, variation of relative instant meshing speed in meshing of gears can be obtained, and variation of speed corresponding to deformation of tooth surface etc. can be seen. (3) By using standard scale with superior measuring precision, variation of speed less than 0. 01% also can be measured.抄録全体を表示PDF形式でダウンロード (1356K) -
テーパはめあいとテーパ角度誤差近藤 孝之1980 年 46 巻 11 号 p. 1363-1367
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe axial and torsional stiffness and the effect of non-coincidence of taper angles are studied by analyzing contact pressure and displacements in a spindle and a sleeve with No. 3 Morse taper fit. Finite element method used for the analysis is the same as the 1st report. The results obtained are as follows: (1) When contact takes place along the entire length of the fit surface displacements are proportional to the thrust force, however there is no proportional relationship between the torsional displacement and the torque because of slippage. The torque is mostly transmitted in the range of slippage. (2) By the taper angle mismatch the contact stiffness decreases and the axial displacement is not proportional to the thrust force. The actual contact length and the axial displacement are calculated approximately. (3) When the shank taper angle may be larger than the bore taper angle or vice versa, the former is desirable for the twist.抄録全体を表示PDF形式でダウンロード (865K) -
河合 正治1980 年 46 巻 11 号 p. 1368-1373
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーA conversational CAD system for the design of mechanical assembly such as a lens unit system consisting of the rotational symmetry parts, for example, barrel, spacer ring, thread ring etc., is developed. The system has the following functions; display of assembly drawing, supporting creation and judgement by the designer, display of parts drawing, modification of the shape of parts, addition of new parts, automated initial designing. The function of display of assembly drawing is realized by 2-dimensional treatment of rotational symmetry component with additional non-rotational symme-try component. In the system, the parts shape is ex-pressed by figure component and state component. Furthermore, in order to recognize mutual relation of parts, the connecting type is grouped into two types. A new method which recognize the connection of the parts, using the function of the interference check, is developed. The method is called virtual displacement method.抄録全体を表示PDF形式でダウンロード (1209K) -
音響寿命における鋼球組織の変化日紫喜 基久, 堀 捷樹, 川辺 秀昭1980 年 46 巻 11 号 p. 1374-1378
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーIn this report, the investigations are made to clarify the effects of the metallographic structure and the fatigue life on the sound life of the steel ball of 9. 5 mm diameter. From these results, the estimation of the fatigue and sound lives are discussed. The results obtained are summarized as follows: (1) In the steel ball having larger half value width of martensite (211), the sound pressure level and the vibration acceleration do not increase during the sound life test. (2) The sound life and the fatigue life are influenced by the metallographic structure of the steel ball. When the half value width of martensite (211) is larger, the sound life becomes longer, and as for the fatigue life, the smaller the variation of the half value width of martensite (211) at the depth of 200 μm from the surface of the steel ball is, the longer the fatigue life becomes. (3) From these facts, it can be concluded that the life of the steel ball is estimated from the sound life at light load or at the initial stage of the life, and from the measurement of the variation of the half value width of martensite (211) at the depth of 200 pm from the surface at heavy load or at the final stage of the life.抄録全体を表示PDF形式でダウンロード (957K) -
研削抵抗の時間的変化島宗 勉, 小野 浩二1980 年 46 巻 11 号 p. 1379-1385
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe grinding forces are discussed analytically based on the forces acting on a cutting grit with wear flat area. The effects of dressing conditions and grinding conditions on the variation of grinding force components with time are investigated theoretically and verified experimentally. The following phenomena in grinding process are clarified theoretically. (1) The modality of the variation in precision grinding process with time is under the control of the relation between operating conditions and dressing conditions. (2) In case of light grinding in comparison with the dressing condition, the attritious wear of abrasives and the grinding forces increase gradually. While, in case of heavy grinding, the bond fracture of grinding wheel occurs, and the forces decrease rapidly. (3) The ratio of the normal component to the tangential component of grinding force is mainly depended on the coefficient of sliding friction between workpiece material and wear flat area of abrasive, and little change of the ratio with time is recognized.抄録全体を表示PDF形式でダウンロード (1604K) -
両角 宗晴1980 年 46 巻 11 号 p. 1386-1391
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the worm thread profile of the type-2 chased worm screw thread. The type-2 chased worm screw thread is produced by the straight-sided chasing tool which is set to the lead angle of the worm at its pitch diameter. To begin with, the theoretical formulas to calculate the axial profile of the tye-2 chased worm screw thread are derived by an analytical method, but these rigorous equations are so complicated that numerical calculations are very troblesome. In order to make practical calculations easier, the approximate formulas to calculate the axial pressure angle at the pitch point and the axial deviation of this curve from the tangent at the pitch point of the axial section profile of this worm screw thread are also derived, and the accuracy of the approximate formulas are numerically estimated comparing their solutions with the exact theoretical ones. Finally some numerical examples are given for the purpose of facilitating the application of this thesis.抄録全体を表示PDF形式でダウンロード (1050K) -
竹内 芳美, 坂本 正史, 佐田 登志夫1980 年 46 巻 11 号 p. 1392-1397
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe present study shows how to improve the working accuracy of numerically controlled lathe by predicting and compensating the thermal expansion of tool during machining, (which is known to affect much on the machining accuracy). The method is based on to correct the numerical control commands corresponding to the thermal expansion of tool in advance of the operation. The amount of expansion can be accurately calculated by the program developed, in which the amount of heat generation is represented as a function of cutting condition. The cutting test by the machine with this compensation has shown to improve the machining accuracy considerably.抄録全体を表示PDF形式でダウンロード (1286K) -
うず電流制振力の解析小島 宏行, 山川 出雲1980 年 46 巻 11 号 p. 1398-1402
発行日: 1980/11/05
公開日: 2010/02/16
ジャーナル フリーCharacteristics of the eddy current damping generated between the cylindrical rare-earth magnet and the conducting material, cylindrical and flat in shape, are investigated. The analysis is made under the assumption that the magnet is homogeneous and magnetized uniformly along the axial direction. The numerical results are compared with the experimental ones with good coincidence and the results obtained are concluded as follows: (1) The damping coefficient may be considered to be in proportion to the product of two quantities ; i. e., the square of the strength of magnetization, and the characteristic function determined by the dimension and relative position of the magnet and the conducting material. (2) The most effective damping may be ' obtained by taking the aspect ratio of the longitudinal section of the magnet as a value nearly equal to unity when the diameter ratio (inside to outside) is small (σ≤0.25).抄録全体を表示PDF形式でダウンロード (1175K) -
熱間重研削の基礎的研究松尾 哲夫, 大島 栄一, 衛藤 敏章1980 年 46 巻 11 号 p. 1403-1408
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーHot grinding of steel billet or slab has attracted much attention from a standpoint of energy-saving. The grinding wheel here must have high hot strength to secure safety. There are many reports on the static bending strength and rotating fracture strength of wheel, but there is little study on hot strength of wheel. In the present study, the pure bending creep test has been performed for several resinoid wheel sticks at the temperatures to 300°C. Thus, the following results were obtained : (1) There is no substantial difference in creep phenom-enon between the wheel and other metallic and non-metallic materials. (2) The steady-state creep rate increases slowly with increasing stress, but over a critical stress the creep rate becomes higher remarkably. (3) The steady-state creep rate is entirely low at the temperatures below about 200°C, but thereafter, the creep rate becomes suddenly higher at a critical temperature. This critical tem-perature is about 50°C higher than the softening temperature of bond material. (4) The zirconia wheel type proved to have much higher creep strength than the alumina wheel type. A strong reason for the high creep strength in the zirconia wheel type is probably due to high adhesive strength of grain and bond.抄録全体を表示PDF形式でダウンロード (1491K) -
清水 伸二, 伊藤 鎮, 福田 理一, 高山 優1980 年 46 巻 11 号 p. 1409-1415
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリー長方形複数ボルト締結体の最適ボルト締付間隔について解析的に検討した結果,次のことが明らかとなった.
(1)弾性床上のはり理論を適用して作成したプログラムにより,最小ボルト本数およびその最適位置を求めることができ,その結果は,実験結果ともほぼ一致する。ただし,結合部ばね定数は,あらかじめ実験的に求めておく必要がある.
(2)最適ボルト位置は,締付間隔と端部長さを適切に決めることにより得ることができ,この比である端部長さ比は,ボルト締付間隔,締結体厚さ,締結体材質結合部ぽね定数によって左右される.
(3)解析結果より,設計図表を作成でき,これを用いて容易に最小ボルト本数およびその最適位置を決定できる.抄録全体を表示PDF形式でダウンロード (1499K) -
松井 正己, 庄司 克雄1980 年 46 巻 11 号 p. 1416-1421
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThe Japanese Industrial Standards Committee recommends the Ball Mill Test for evaluation of abrasive grain toughness; but it may be the grindability rather than the toughness that is assessed by this method, i. e. the ability how finely to be crushed. The authors, from the viewpoint that the term toughness means the energy for fracture, measured the fracture energy of abrasive grains in a drop-hammer type friability test. Main results obtained are summarized as follows: (1) Fracture energy has no significant correlation to hammer speeds ranging from 0.3-1.1 m/s. (2) Fracture energy becomes very large because of repeated impacts on the abrasive grain when the clearance between platens of hammer and anvil is too small compared to the grain size. (3) Fracture energy is directly proportional to the third power of the mean diameter of abrasive grains. (4) Fracture energy of abrasive materials recommended for heavy grinding is extremely high, followed by conventional aluminium oxide and silicon carbide abrasives. (5) Roasting at 1 300°C is valuable for improving the toughness of aluminium oxide grains.抄録全体を表示PDF形式でダウンロード (1372K) -
山川 出雲, 藤生 泰央, 小島 宏行, 奥野 勝也, 町田 肇, 赤木 諭1980 年 46 巻 11 号 p. 1422-1427
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーThis paper presents a new type electro-magnetic shaking table, possible to drive it by an arbitrary signal composed of several harmonic waves and providing ample facilities for an inspection of vibrometer as well as for testing unityvibration char-acters of various instruments. For this purpose, the combination of Rare Earth-Cobalt (Sm-Co) magnets and flat coils is used, in which the latter is considered to have higher linearity than that of solenoid type in frequency characteristics, and the apparatus is equipped with a control device with operation circuit. The experiment showed that (1) the amplitude of the shaking table to the simple harmonic signal can be kept at nearly constant within some limits of ±α% over the corresponding frequency range by the appropriate selection of the circuit parameters, and (2) the combined harmonic wave figures are reproduced fairly well on the shaking table without noticeable distortion, owing to the good linearity of the flat coils. The theoretical analysis and the numerical calculation by means of a digital computer make it clear that the optimal combination of parameters may be expressed by a set of numerical formula.抄録全体を表示PDF形式でダウンロード (3348K) -
歯面修整法の検討下河辺 明, 豊山 晃, 我妻 雄策1980 年 46 巻 11 号 p. 1428-1433
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーTooth modification makes worm gears have an entry gap and avoid the possibility of edge contact caused by the profile error and the setting error of hob and worm gears. Modification methods discussed here are; (1) Wakuri and And's method. (2) The method using hobs which have a larger diameter than that of worms. (3) A new method, in which modification is accomplished with a clearance between the profile of worm and that of hob at the tip and root, and with a center distance of worm gears a little larger than that for hobbing the gear wheel. Two worm gears -one has a screw helicoid worm and the other a worm finish-ground with a conical grinding wheel- are examined. As to the worm gears produced to prove the new method, it is shown that the experimental tooth bearings agree with the calculated ones.抄録全体を表示PDF形式でダウンロード (1115K) -
高木 理逸1980 年 46 巻 11 号 p. 1434-1440
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1411K) -
久保田 浩司1980 年 46 巻 11 号 p. 1441
発行日: 1980/11/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (255K)
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