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48 巻, 3 号
選択された号の論文の21件中1～21を表示しています
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砥石の弾性率長尾 高明, 竹中 規雄, 中島 信行, 岡田 昭次郎1982 年 48 巻 3 号 p. 287-292
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリービトリファイド砥石を,球形粒子と結合剤から成る多粒子結合体と考え,それらの粒子間に線形の相互作用を仮定し,更に粒子まわりの力の楕円体分布を仮定し,それらを基にして,粒子間のミクロな力と変位の関係を導き,それらを平均して,次のようなマクロな応力ひずみ関係式を導いた.
ε=K・σ
K=(KJK)
KJK=k1δJK+k2
k1〓K1{2/5πbm'+am'√2/6π2(A/B)1/2}+1+υG/βEG
k2〓K1{4/15πbm'-am'√2/32π2(A/B)1/2}-υG/βEG
A=(σI-σII)2+(σII-σIII)2+(σIII-σI)2
B=σI2+σII2+σIII2
また,これより単軸及び三軸圧縮試験の場合の応力ひずみ関係をも求めた.この結果,ビトリファイド砥石の弾性率の応力依存性が明らかになった.更に,砥粒及び結合剤のヤソグ率及びポアソン比,砥粒間平均距離,結合部の半径及び厚み,砥粒率等が砥石の弾性率に関係することも明らかにされた.抄録全体を表示PDF形式でダウンロード (626K) -
神谷 好承, 岡部 佐規一, 横山 恭男1982 年 48 巻 3 号 p. 293-298
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーAccounting for the development of automation, PWM (pulse width modulation)-modeamplifiers have been used in many servo mechanisms. The merits of PWM-mode amplifiers are low cost because of the recent development of high power transistors and low loss of energy. But it is difficult to find the quantitative characteristics of the PWM-mode amplifier in the closed loop that includes the PWM-mode amplifier, because the PWM-mode amplifier has the nonlinear dynamic characteristics. In this study we find the equivalent linearized transfer function of the PWM-mode amplifiers according to analyzing the relation between the input and the output signals of the PWM-mode amplifiers in the frequency domain. As the results of this study, it is found that the dynamic characteristics of the equivalent linearized transfer function are well agreed with the dynamic characteristics of the PWM-mode amplifier on the step responses and the frequency characteristics of the PWM-mode amplifier by the analog simulation of the PWM-mode amplifier. And it is also shown that the carrier frequency of the PWM-mode amplifiers shows the dither effect for the solid friction.抄録全体を表示PDF形式でダウンロード (836K) -
格内 敏, 渡邊 嘉郎1982 年 48 巻 3 号 p. 299-304
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper deals with the assistant method to conjecture the lubricated condition at the interface between tools and specimens in cylindrical specimens under the axial load. This method is based on the minute and continuous observation of thedeformation of the cylindrical surface adjacent to the contact area under the axial load by using the holographic interferometry. For the purpose of ensuring the availability of this method, effects of lubricant viscosities, the machined surface shapes and height to diameter ratios of specimens on the deformation of cylindrical surface are discussed and illustrated if necessary.抄録全体を表示PDF形式でダウンロード (1347K) -
光学ガラスのポリウレタンポリシングの場合田中 国弘, 田中 芳雄, 井戸 守1982 年 48 巻 3 号 p. 305-310
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーCharacteristics of the shape generation process are investigated in polyurethane-polishing. Polishings are carried out in two cases: one is for crude polisher by using cast iron, the other for optical glass by the polished polisher. The applied machine has the same mechanism as is usually used in fabricating optical lenses and optical flats. Experimental results show that fundamental characteristics are almost the same as is found in the rotation/reciprocation lapping. Especially, in the latter polishing, the following facts are revealed. (1) The stock removal ratio of the polisher to the glass changes as the polishing proceeds or surface finish of the glass is improved. (2) The process is analogous to that in a hypothetical lapping where a time variant stock removal ratio is assumed to be. (3) The behavior of the process is represented by a linear differential equation whose parameters vary with the time depending upon the stock removal ratio.抄録全体を表示PDF形式でダウンロード (925K) -
適応性の優れた吸振器の開発岡田 養二, 倉田 道夫, 楊 華驥1982 年 48 巻 3 号 p. 311-316
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリーOne of the effective means of increasing modal damping, which has been adopted in a number of instances, is by the use of dynamic vibration absorbers. The major limitation, however, is the requirement for the auxiliary absorber system parameters to be matched with those of the main structure. Mismatching will result in a severe deterioration in performance. This paper introduces a two degree-of-freedom vibration damper which has two damper masses coupled serially to the main structure. Analyzing the various damper parameters, two design methods were calculated with the aid of a computer. The first one determines the auxiliary system parameters so that the main structure has the lowest peak resonances. The other one is based on the philosophy that a damper's performance should be less sensitive to the parameter changes in the main structure. Despite its design complexity, this insensitiveness is very convenient for practical use. The experimental results clarify the validity of those design criteria.抄録全体を表示PDF形式でダウンロード (922K) -
強度設計プログラムの開発丸山 一男, 萩原 正弥1982 年 48 巻 3 号 p. 317-322
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーThe computer program is developed for the strength design of the single-bolted joint. This program is based on the published studies, but the new method is developed where transverse force and bending moment operate. The results obtained through the compilation of this program are as follows: (1) For the systematization of the strength design, it is indicated that the calculation system in which the joint is replaced by single-bolted joint model is more advantageous. And in this case the general equations are obtained for the load condition in which transverse force and bending moment operate besides axial force. (2) The computer program based on the above method of calculation is developed.抄録全体を表示PDF形式でダウンロード (774K) -
熱変形量の測定法・加工条件の影響横山 和宏, 一宮 亮一1982 年 48 巻 3 号 p. 323-328
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーThis paper presents the experimental analyses of thermal deformation of the workpiece due to heat generated between the workpiece and honing stone in honing operation. Inner surface of the cylindrical workpiece is honed where super-invar pins are set. Thermal deformation at the inner surface is calculated from the thermal deformation at the outer surface of workpiece and the convex dimension of super-invar pin on the inner surface at room temperature. The results indicate that cylindrical workpiece shows nearly isothermal expansion. Inner diameter of the workpiece at room temperature becomes smaller as much as thermal deformation than the diameter at end of honing, however the honing heat does not significantly affect on the geometrical accuracy of the workpiece. Greater the expansion pressure of honing stone, the revolution of spindle and the over-run of honing stone, straightly greater the thermal deformation appears. When the flow rate of coolant is greater, the thermal deformation appears exponentially smaller and then becomes gradually a steady value. The thermal deformation of workpiece shows a tendency proportional to stock removal in honing, however it is observed that these values are scattered.抄録全体を表示PDF形式でダウンロード (976K) -
菅原 章1982 年 48 巻 3 号 p. 329-335
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリー微小径ドリルを用いて結晶粒の大きさに違いがある被削材に同じ加工条件で穴あけを行ったときに,そのときの切残しは結晶粒が大きい被削材の方が小さい被削材の穴あけより少なくなる現象がある.この現象を解明する一つの方法として三つの推測をし,これらを実験的に証明する方法により次の結果を得た.
(1) 切残しが生成されやすい面積は微小径ドリルの切込み深さが同じ場合に,加工の対象になっている結晶粒の大きさによって異なり,大きい結晶粒では小さい結晶粒に比べて大きくなる.このとき結晶粒界は塑性変形の拡大を阻止することがすべり線の観察によって確かめられた.
(2) 同じ直径の微小ドリル加工でドリル送りが同じ場合の切削抵抗は,被加工面に含まれて加工の対象になる結晶粒数が多いほど結晶の異方性の影響および被削材の硬度が大きくなるために大きくなる.このとき切残しは結晶粒が比較的大きく,個々の結晶粒界が被加工面の近傍に連続してある場合に,結晶粒界が塑性変形を妨げるために少なくなる.
(3) ドリル1回転あたりの切込み深さが微小である穴あけにおいては,切れ刃稜の微小な凸部がそれぞれ切れ刃となり被削材と摩擦接触や上すべりを起こさないで微小切削が行われるため切残しが小さくなると考えられる.抄録全体を表示PDF形式でダウンロード (1684K) -
垣野 義昭, 江田 弘, 貴志 浩三, 山田 卓郎, 藤原 彰彦1982 年 48 巻 3 号 p. 336-340
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーNewly developed method using acoustic emission was compared with the conventional method using accelerometer for the performance in detecting the starting time of grinding. It was clarified that the starting time of grinding can be detected earlier by acoustic emission than by accelerometer, especially in the case of the workpiece with large eccentricity of the stock removal. Acoustic emission below 150 kHz measured soon after the start of grinding, was smaller by 10-15 dB than that measured afterwards. The power spectrum of acoustic emission measured soon after the start of grinding was very similar to that measured when two grinding wheels were scrubbed onto each other.抄録全体を表示PDF形式でダウンロード (966K) -
宇根 篤〓, 上野 嘉之1982 年 48 巻 3 号 p. 341-347
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリーA lapping/polishing machine has been newly designed and constructed to produce precise flat surfaces efficiently. The machine can control the shape of a base plate by varying the pressure distribution on the work plates and the conditioning rings. It is also possible to control the shape of the base plate by changing the rotating speeds of the base plate and the work plates. Stable floating characteristics and vibration suppression to less than 1 μm are attained by using hydrodynamic bearings for the base plate bearings. Accurate and large loading are also attained by using parallel leaf springs. The base plate and work plate surfaces are lapped within a few microns by controlling the pressure distribution. The base plate always attains an isothermal state during silicon wafer polishing, because the upper and lower surface temperatures of the base plate rise simultaneously due to polishing and motor power heat. On the other hand, the work plates are deformed thermally. Therefore, two-layer discs with a larger coefficient of thermal expansion in the upper layer were used to reduce thermal deformation. As a result, it has been proved that highly accurate polishing may be attained efficiently by using the machine.抄録全体を表示PDF形式でダウンロード (1584K) -
加工穴の多角形形状と切削条件の影響佐久間 敬三, 清田 宏1982 年 48 巻 3 号 p. 348-353
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーThe forming process of multi-corner profiled hole machined with carbide tipped reamer is examined by means of giving the forced vibration on the tool shank by electrodynamic exciter under cutting. Frequency of vibratory movement of tool axis observed in radial directions corresponds to that of integral times of Z, number of teeth, in spite of containing the fraction in loaded exciting frequency. Difference of effect of the fraction on the bending frequency of the tool shank in exciting directionand that in direction of right angle to it leads to periodic variation of the process during cutting. When varying width of tool margin and cutting conditions in reaming steel, hole profile contains many other corner components than that observed in appearance. Multi-cornered profile corresponding to the case of n=1, e. g., seven cornered shape, using six-teethed reamer, is produced under larger burnishing torque. Natural frequency of spidle-tool system has occasionally influence on sectional profile in reamed hole under smaller burnishing torque when cutting speed is higher.抄録全体を表示PDF形式でダウンロード (949K) -
適正加工条件の選定小野 浩二, 島宗 勉, 餅田 正秋, 平山 忍1982 年 48 巻 3 号 p. 354-359
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリーThe selection of operating conditions without electric discharge is investigated experimentally and analytically in peripheral electrolytic grinding process. When electric discharge occurs, the electrode surface of grinding wheel is damaged, the efficiency of electrolyte declines, and the electrochemical removal rate decreases. The electric discharge occurs when the chip volume of mechanical grinding is more than an invariable value, which decreases linearly with an increasing applied voltage. The limiting work feed rate without electric discharge is derived analytically, and the reasonable operating conditions which increase the total removal rate and reduce the mechanical removal ratio are presented.抄録全体を表示PDF形式でダウンロード (915K) -
断続切削性能と破損過程河端 裕, 藤村 善雄, 中林 伸一1982 年 48 巻 3 号 p. 360-365
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーIntermittent cutting operation is characterised by mechanical stresses due to cutting load together with thermal stresses arising from cyclic temperature fractuations. This paper presents the results of the cutting tests performed to examine the influence of mechanical stress on the performance of the three cermet tools (TiC simple carbide type, TiN added type, TaC added type) in an intermittent cutting operation. Machining tests were conducted on a lathe by cutting steel bars with narrow slots. Cutting speed was varied from 1. 25 m/s to 4. 17 m/s, but depth of cut (1. 5 mm) and feed rate (0.2 mm/rev) were maintained constant throughout the tests. In this experiment, the tool edge fracture was adopted as the criterion for tool failure. TiN added type tool which has highest bending strength shows the most excellent performance in intermittent cutting operations, but TaC added type tool which has poor bending strength tends to be fractured within a small number of impact times. Plotting the data of failure on the Weibull probability chart indicates that its distribution, could not be considered as the Weibull's probability distribution, but it could be divided into three parts named premature, stationary and final failure region. The increasing cutting speed which is accompanied by the increasing cutting temperature decreases the probability of the tool failure which occurs in the premature failure region, and increases the average tool life.抄録全体を表示PDF形式でダウンロード (1383K) -
切断特性の定常確率過程解析長谷川 素由, 中西 佑二1982 年 48 巻 3 号 p. 366-370
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーThe feed rate and the grinding ratio for abrasive cut-off process of S 50 C steel were analyzed 100 times in terms of different combination of grinding conditions. The analysis included the length of cut and the load. The tests were carried out at the wheel speed of 4 800 m/min in order to investigate the optimal abrasive cut-off system. Autoregressive-moving average model, ARMA(2, 1) is developed to represent the stochastic process of the feed rate and the grinding ratio. The feed rate and the grinding ratio are optimum when the pressure between the wheel and the workpiece is 6.67 N/mm2. Best abrasive cut-off performance by the constant load system is obtained by using the length of cut of 15 mm and the load of 300 N with the height of workpiece of 22 mm at the wheel speed of 4 800 m/min.抄録全体を表示PDF形式でダウンロード (630K) -
沢辺 雅二, 横山 豊, 津田 展宏, 広瀬 藤司, 蓮尾 顕穂1982 年 48 巻 3 号 p. 371-377
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (1341K) -
牧野 洋, 村田 誠, 古屋 信幸1982 年 48 巻 3 号 p. 378-383
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1452K) -
北村 隆儀, 谷口 勝二, 山田 滋, 竹部 豊一1982 年 48 巻 3 号 p. 384-387
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (713K) -
杉本 登1982 年 48 巻 3 号 p. 388-393
発行日: 1982/03/05
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (1289K) -
加藤 敬1982 年 48 巻 3 号 p. 394-398
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (926K) -
松尾 哲夫1982 年 48 巻 3 号 p. 399-400
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (393K) -
斎藤 勝政1982 年 48 巻 3 号 p. 401-402
発行日: 1982/03/05
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (344K)
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