巻号一覧
57 巻, 538 号
選択された号の論文の60件中51～60を表示しています
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佐藤 啓仁, 山本 純雄, 勝沼 歩, 光野 勝也1991 年 57 巻 538 号 p. 2108-2113
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーTo discuss whether or not distinctive new phenomena occur in the gear system with its backlash and time variable characters is an important and interesting problem from a practical viewpoint of estimating the dynamic load or gear noise as well as an academic one of contribution to nonlinear mechanics. The existence of chaotic motion in a simple single degree of freedom gear model was already verified numerically by the authors. In this study, the chaotic motion of a two degree of freedom gear model considering the effect of the shaft stiffness on the gear dynamics are investigated by using the Poincare map, the Li-Yorke's theorem, the Liapunov exponent and the invariant probability distribution.抄録全体を表示PDF形式でダウンロード (539K) -
新井 典久, 河本 滋, 米田 春明, 広垣 俊樹, 水本 克典1991 年 57 巻 538 号 p. 2114-2117
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーIt is very important to know load distribution on the line of contact and tooth root stresses of the spiral bevel gear. However, there are few studies hitherto which deal with these problems. Under present day situation, the analysis of tooth root stresses of the Oerlikon type spiral bevel gear was chosen as one of the subjects of our studies. That is to say, by using three dimensional finite element method, distribusion of tooth root stresses of the spiral bevel gear was examined. And consequently, it Was found that the computed results agree well with those by equation of W. Coleman and application of this equation for compution of tooth root stresses of the Oerlikon type spiral bevel gear is effective.抄録全体を表示PDF形式でダウンロード (486K) -
北條 春夫, 梅澤 清彦1991 年 57 巻 538 号 p. 2118-2125
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーTooth mesh frequency sound generated aerodynamically at the region of meshing was investigated to find out a genaral characteristis of the sound emissioin as well as its detailed source locations. Sound pressure response measurement for various facewidth revealed that emission is expressed in terms of a similarity law as a function of a parameter b/λ, the ratio of facewidth to the wavelength of the sound. The effect of dimensions such as module, number of teeth were derived by means of a dimensional analysis with respect to a pumping action of the cavity between driving and driven gears. Throughout several kinds of experiments, one source is located at the middle of the exit of meshing, which becomes prominent ad the axial air fiow reaches to a certain speed. Another source is estimated to spread over both face ends, whose radiation characteristics are closely related to the distribution and the solid boundary of the gear pair.抄録全体を表示PDF形式でダウンロード (830K) -
高津 宣夫, 加藤 正名, 石川 正人, 井上 克己1991 年 57 巻 538 号 p. 2126-2131
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーTransfer function of a single stage gearbox is presented to simulate the transmission of gear-mesh induced vibration to the housing. Transfer function of a substructure composed of a pair of spur gears, shafts supported by ball bearings is introduced considering the gear mesh. The substructure is then assembled with a housing, whose transfer characteristics is already known, by BBA. Vibration transmissibility defined by the ratio of the acceleration of any point on the housing to the circumferential acceleration of one of gear bodies is introduced and response of the box due to actual gear acceleration obtained by experiment is calculated. The calculations are compared with the experimental response showing pretty good agreement. The method may be useful to predict the structure borne noise caused by gear mesh.抄録全体を表示PDF形式でダウンロード (612K) -
庄司 彰, 片岡 紘, 松沢 欽哉1991 年 57 巻 538 号 p. 2132-2137
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーThis paper describes the manufacture of microscopic plastic gears by making use of pressurized and thermal contraction. Making a mechanical system microscopic enables the mechanical system to perform more microscopic motion. While it has many merits, the plastic used for gears has several defects. In the experiment, a plastic plate was made film-shaped by the multispindle drawing method. and machined for gear cutting. A high-precision gear is obtained by machining. Then, a microscopic gear is obtained by pressurized and thermal contraction. Since the gear uniformly shrinks in all directions over mutiple shafts, the machining accuracy can be maintained. As a result of the experiment, it has become possible to manufacture gears of 0.05 in module and of 1mm or less in outside diameter. Being high in both tooth profile accuracy and dimensional accuracy, we were able to manufacture gears with the highest accuracy we have seen so far. Since gears with a large face width can be manufactured, widespread applications are foreseen.抄録全体を表示PDF形式でダウンロード (600K) -
三留 謙一, 建部 研1991 年 57 巻 538 号 p. 2138-2143
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーAn over-ball measurement of helical conical involute gear is newly developed. This method makes it possible to control the finished size of the gear in hobbing and grinding. First the over-ball distance is obtained analytically, and next is verified by experiments. Besides, how to apply this measurement to controlling the infeed distance in practical hobbing and grinding is presented.抄録全体を表示PDF形式でダウンロード (574K) -
吉野 英弘, 池野 一広1991 年 57 巻 538 号 p. 2144-2148
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーA method for modifying tooth traces (crowning) of helical gears finished in form grinding is described. Three kinds of additional motion in grinding process, (a) the approaching motion between the grinding wheel and work axes, (b) the additional Screw motion of the work gear, and (c) the shifting motion of the grinding wheel. are introduced for crowning of helical gears. Equations for calculating the tooth profiles of the crowned helical gears ground with these additional motions are derived. The shapes of the tooth surfaces of the crowned helical gears are illustrated using the contour lines which indicate the distance from the theoretical involute tooth surface. From the results of numerical calculation, it is shown that use of the approaching motion between the grinding wheel and work axes is the most practical method of crowning because it produces both tooth surfaces at the same time, accomplishing suitable profile modification at the tooth ends where the contact between the meshing teeth starts.抄録全体を表示PDF形式でダウンロード (601K) -
新野 秀憲, 黄 国金, RAHMAN Mustafizur1991 年 57 巻 538 号 p. 2149-2153
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーIt has become very important to develop an in-process monitoring system for machining environment to materialize fully automated and unattended machining. Various monitoring systems have so far been proposed by different researchers. However, most of the systems are not yet effective for practical use except those of AE and piezoelectric types. A new in-process monitoring system for machining environment has, therefore, been proposed which is based on heat flux sensing. Heat flux can be expressed as a time derivative of temperature, thus, this is more sensitive to the variation of temperature. It can be expected that the sensing of heat flux is suitable for the recognition of the machining environment. In this paper, the in-process monitoring of the tool wear has been tried to estimate the potential of the proposed method. The results of actual cutting tests ascertain that the output signal of heat flux sensor is useful and effective for in-process monitoring of tool wear.抄録全体を表示PDF形式でダウンロード (492K) -
上田 隆司, 金曽 久佳, 杉田 忠彰1991 年 57 巻 538 号 p. 2154-2159
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーBoth an evaluating function d to present the overall severity of superfinishing conditions and an equation ks to calculate the specific finishing energy are derived theoretically, assuming that one stick corresponds to a single point tool with a long cutting edge. Some experiments are carried out to confirm the propriety of these results. The ks-d relation calculated from the experimental results is useful in the evaluation of the machinability of work materials and the cutting ability of the stick. Moreover, this relation makes it possible to compare the superfinishing in the production rate and the surface refinement with the honing.抄録全体を表示PDF形式でダウンロード (628K) -
佐川 克雄, 江田 弘, 高島 茂雄1991 年 57 巻 538 号 p. 2160-2165
発行日: 1991/06/25
公開日: 2008/02/21
ジャーナル フリーGrinding experiments have been carried out on Al2O3, ZrO2 and Si3N4 ceramics using single point diamond tools. Also, the micro plastic flow condition during the grinding test was investigated for clarification regarding various kind ceramics. Next, the relationship between depth of cut and microcracks was examined using the cylindrical grinding machine with a practical diamond wheels. The experimental results showed that micro plastic flow is dependent on a small depth of cut using a lower elastic bond wheel. The formation of the ductile mode grinding in the single point diamond grinding results and cylindrical grinding experimental results showed the possibility of applying the Hertz's formula for microcracks using the equivalent radius of the abrasive cutting edge.抄録全体を表示PDF形式でダウンロード (706K)