巻号一覧
後続誌
41 巻, 485 号
選択された号の論文の15件中1～15を表示しています
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切削工具模型による熱変形のシミュレーション秋山 俊彦, 覚知 尚志, 岸浪 建史, 斉藤 勝政1975 年 41 巻 485 号 p. 512-519
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーThe thermal deformation of cutting tool in metal cutting gives unfavorable influences on the accuracy of required geometries of workpieces and the life of cutting tool. Various attempts have been made on the experimental evaluation of thermal deformation of the cutting edge and the thermal stress in the cutting tool. In this paper theoretical analyses on the thermal deformation of cutting tool and the thermal stress in it are carried out by using the finite element method. And the investigation in this paper showed that the effect of the thermal displacement of the cutting edge could not be disregarded in the case of fine machining on the accuracy of required geometries.抄録全体を表示PDF形式でダウンロード (1051K) -
ブルドン管圧力計に関する研究(第2報)古川 浩, 高橋 一雄1975 年 41 巻 485 号 p. 520-526
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーThe accuracy of the Bourdon tube pressure gauge has connection with "the error of shape"which is caused by the manufacturing process. These errors of shape are classified into two groups, (1) avoidable errors, and (2) unavoidable ones. For example ; accuracy, rigidity, and the change of torque of the bender belong to the former, so far the error of thickness by bending and these errors of bending radius belong to the latter. This paper deals with studies on the origins which cause them in terms of the manufacturing processes, and presumes the mechanisms of occurance of thickness is analyzed in plasticity, and obtains the desirable results that the calculation value from this theory coincides with the experimental one.抄録全体を表示PDF形式でダウンロード (3874K) -
岸浪 建史, 吉田 竹利, 斉藤 勝政1975 年 41 巻 485 号 p. 527-532
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーFor achieving the minimum cutting cost, it is necessary to find the method for determining the optimum assigned operation for the multi-stage manufacturing system (i. e. a machiningcenter or NC-machine tools combining some operations), and to determine the optimum cutting variables for each operation corresponding to the assignment. In order to find the optimum assignment for the multi-stage manufacturing system, the dynamic programing has been applied to the numerical model for it, which is given by transforming the optimum assignment of operations to the optimum job allocation for each operation, in such a way that the precedence relations are not violated.抄録全体を表示PDF形式でダウンロード (848K) -
予圧が付与された場合の負荷分布理論井沢 実, 清水 茂夫1975 年 41 巻 485 号 p. 533-539
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーIn many cases of practical application of the linear motion ball bearing, some preload is given to the bearing for the purpose of removal of clearance between shaft and bearing. When the load is applied on the shaft under such condition, contact domains of each ball located between raceway of the bearing sleeve and the shaft are increased considerably as compared with the bearing which has some internal clearance. Consequently, the amount of load acting on ball in each ball row and also distributed situation are quite different from those which the bearing has some internal clearance. This paper deals with the theoretical analysis of the load distribution regarding to the case of symmetrical and asymmetrical arrangements of ball row in the linear motion bearing which supports both moment and radial load and has some preloading. As the result, in spite of any arrangement of ball row in the bearing and any load condition, it was found that the maximum distributed load acting on ball can be considerably reduced by means of giving preload such as a (the ratio between amount of radial preload and maximum radial displacement of the shaft at the center point in the bearing) is equal to 0.5-1.0.抄録全体を表示PDF形式でダウンロード (747K) -
江田 弘, 市田 良夫, 貴志 浩三1975 年 41 巻 485 号 p. 540-546
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーIn order to evaluate the deformation and fracture behavior of the secondary phase grain and alloying particle grains, the fracture surface on the chip-built-up-edge-machined surface subjected to orthogonal cutting has been examined by the scanning electron microscope (SEM). The observation is carried out that the fracture surface in the three-dimensional makes clear up the relation between the micro and macro-fracture behaviors on the chip-built-up-edge-machined surface vicinity by use of the SEM of from 60 magnification to 15 000. The findings are as follows:
(1) The secondary phase grain (Si) and alloying particle grains (Mg2Si, CuAl2, Al3Ni and Al3Ni2) were shown various fracture behaviors in the chip, built-up-edge and machined skin layer such as crashed and partly disappeared, cracked one and that flowing with the matrix of the primary crystal α Al.
(2) It is noted that the observation of SEM is obtained many kinds of information in relation to the massive studies of cutting mechanism in the past.抄録全体を表示PDF形式でダウンロード (2321K) -
奥野 卓夫, 輪竹 千三郎, 山田 嘉昭1975 年 41 巻 485 号 p. 547-551
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリー本報告では,変位量拡大モアレ法に基づいて試作した高次モアレひずみ測定器の感度および精度の検定結果,ならびにひずみ測定例のいくつかを報告した.測定例では,本法.と従来法のモアレ写真を比較したものは一例のみてあるが,ほカの写真はすべて本法で行っている.したがって格子原板として500線/inを使用したときには,従来法において5000線/inの格子原板を使用したことに相当し,感度が10倍になっている.このため,モアレ法で困難とされていた弾性オーダのひずみ測定が可能となり,モアレ法の応用範囲が格段に広がったと考える.また開発した測定器により,モアレ法の適用は,精度の点で改良されたばかりでなく,実施もきわめて容易になったと考えられる.なお試験例で用いた格子線はすべて平行格子のみであったが,直交格子を使用すれば,平面内のひずみの3成分を同時に求めること.も可能である.本報告の方法には,紹介した例のほかにも,いろいろな応用があると考えられ,多くの方々によって試みられることを期待したい.抄録全体を表示PDF形式でダウンロード (10083K) -
切りくず生成現象に関する実験的研究(第1報)田口 三生, 横山 一男, 白石 政市1975 年 41 巻 485 号 p. 552-558
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーOrthogonal cutting of eight kinds of the work materials including cast irons, steels and copper alloy was experimentally photographed at the cutting speeds ranging from 10 mm/min to 200 m/min, in order to organize systematic knowledge on the formation, separation and the final shape of the chip. The results of these tests were as follows:
The chip formation phenomenon exhibits characteristic variation of its type at various cutting speeds, inherently to the cut metal. Various steels and the brass show similar tendency of chip formation whereas cast irons behave differently. When the cutting speed is increased, the chip formation mechanism changes from crack type to shear type, and from shear type to flow type. The shape of the chip meantime changes from the powder or fragmental chip to the spiral chip, and from the spiral chip to the helical or tangled chip. At low speed, the chip is mostly separated from the workpiece at the point of the tool tip, while, at high speed, it is separated at the place far from the tool tip.抄録全体を表示PDF形式でダウンロード (1200K) -
坂口 克己, 隈部 淳一郎1975 年 41 巻 485 号 p. 559-564
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーThispaperdescribes somespecial impact properties of the grinding wheel which vibrates longitudinally in the frequency f= 28 kHz and the amplitude a = 0-6 μm. The vibration tensile stress σv is added to the nodal point of the vibrating wheel as the initial stress. The impact property of this vibrating wheel is examined by the Izod impact method. From the experiments the following conclusions are obtained.
(1) √Eρ/σB (E: modulus of longitudinal elasticity, ρ: density, σB: tensile strength) of the wheel is larger than √Eρ/σBof the metal so that the tensile stress ratio ζ=σv/σB= 2πaf√Eρ/σB (a: amplitude, f: frequency) becomes very small and varies the property of the wheel.
(2) The impact resistance force-time curve of the high grade wheel varies with the tensile stress ratio ζ, and corresponds to that of the lower grade wheel for a= 0.
(3) The variation of the impact property caused by ζ is the common phenomena to all kinds of the wheel.抄録全体を表示PDF形式でダウンロード (744K) -
過切削現象のある場合の切削機構長谷川 嘉雄, 花崎 伸作, 鈴木 康夫1975 年 41 巻 485 号 p. 565-571
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーIn the orthogonal cutting of aluminium, there occurs the overcutting beyond the depth of cut in a certain cutting condition. The situation of the overcutting is considerably complex; according to the observation however, it can be explained by the shear process in case of no chip flow in spite of continuous tool motion. So, comparing the shear test in dry and wet states with the friction and the cutting tests, the cutting mechanism of such a case is experimentally studied. Some results obtained are as follows:
(1) The presence of the overcutting phenomenon is accompanied with the intermittent chip flow. The cutting process is intensely affected by friction and weld on the rear surface of chip.
(2) The lubrication on the rake face or on the rear surface of chip in overcutting changes the state of cutting suddenly ; i. e. the chip becomes thin, the cutting force small and the cutting surface good. Thus the overcutting phenomenon disappears perfectly or partly.抄録全体を表示PDF形式でダウンロード (6331K) -
松井 正己, 中川 哲郎1975 年 41 巻 485 号 p. 572-577
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーIn this paper, the influence of work speed, number of sparkout and forced vibration on the roughness of ground surface in the perpendicular section to grinding direction was investigated experimentally. The influence of work speed on the roughness of ground surface in the parallel one was investigated experimentally, too. On the other hand, using the experimental results of the distribution in depth for the position of grain cutting edges and the distribution of grain tip angles in the wheel surface layer, theoretical values of the roughness were calculated and compared with experimental values. Further, it was made clear by Monte Carlo simulation that the influence of elastic displacement of grain cutting edges on the roughness of ground surface in the perpendicular section to grinding direction was not so large.抄録全体を表示PDF形式でダウンロード (859K) -
チタンの穴加工に関する基礎的研究佐久間 敬三, 藤田 武男1975 年 41 巻 485 号 p. 578-583
発行日: 1975/06/05
公開日: 2010/02/16
ジャーナル フリー以上の実験から,チタンと工具材の摩擦において,乾式および湿式のいずれの場合も高速度鋼(SKH4)が使用工具中最も耐摩耗性にすぐれ,超硬合金工具としてはK10がすぐれていることがわかった.したがってSKH4とK10の切削性能を比較するため穴加工工具に類似する条件での切削実験を行った.そのため工具は深穴加工工具のマージン部を含む刃先形状に類似させ,前逃げ角およびすくい角を0°とし工具形状を(0°,0°,0°,5°,0°,30°,0)とした(図8参照).図9はそのときの逃げ面摩耗幅を比較したものである,これから高速度工具で切削速度V=200m/min程度の切削が可能であり,この程度の速度であればK10よりすぐれた切削性能を示している.しかし高速度鋼の場合につき速度を変えて行った実験,図10よりV=250m/min以上では切削温度の上昇により短時間で切削不能となることがわかる.したがって高速度鋼を穴加工工具の切れ刃として使用する場合はV=200m/min以下にする必要がある.
次にチタンの切削面は高速・低速いずれの場合でも非常に良好であり,逃げ面摩耗幅が0.25mm以内であればほとんど問題はない,しかしこれ以上の摩耗幅になると切れ味がにぶり切れ刃と被削材間に微小な切削粉が付着して加工面が害されることが多くなる.したがってチタンの外径旋削においては工具摩耗のあまり進行していない状態で切りくずが切削中加工面に接触しないように注意すればよい.しかし穴加工工具のパッド部またはマージン部のように工具とチタンが摩擦状態にある場合は前記の工具摩耗幅が特に大きくなった場合と同じであり,軟質材である純チタンがむしりとられて工具上に付着するためチタン同志の摩擦を避けることが困難となる.図11は各種工具材と純チタンを摩擦させたときのチタンの表面状態である.チタンの摩擦表面をP01,K10およびSKH4の場合で比較すると,P01の場合がわずか粗いが,その差は顕著でなく,いずれも著しく悪い.相手材が黄銅の場合はチタンの表面は良好である.このような純チタンの摩擦表面の差異は相手材との親和性に依存していると考えられるが,工具材との摩擦のように相手材が著しく硬い場合はチタンの表面が掘り起こされて付着するため表面はいっそう悪化するようである.チタンの摩擦面は押付圧力を小さくすることおよび油剤の使用により,その付着片をより微小に,また少なくできるが,摩擦時にチタンのむしり現象があるかぎり,切削で認められるような良好な面を得ることはできない.
以上よりチタンの穴加工において加工中案内部が穴壁に強く摩擦する形式の工具,例えば深穴加工用ソリッドボーリング工具(BTA方式)などでは工具材として案内パッド部には高速度鋼が適し,切れ刃部にはK系超硬合金または高速度鋼が適しているものと推定される.一般のP系超硬合金は適当でない.このことはガンドリルおよびリーマの場合も同じと考えられる.抄録全体を表示PDF形式でダウンロード (6447K) -
超音波振動するダイヤモンド工具による精密切削隈部 淳一郎1975 年 41 巻 485 号 p. 584-591
発行日: 1975/06/05
公開日: 2010/02/16
ジャーナル フリーThis report proves the possibility of precision face turning and planing for carbon steel hardened from HRC 29 to 57 by vibrating cutting with vibrated diamond tool ultrasonically. Face turning cutting conditions are as follows: frequency ; 21.3 kHz, amplitude; 18 μm, cutting speed; 15-30 m/min, cutting depth ; 0.05-0.10 mm, feed; 0.05-0.14 mm, nose radius; 1.3 mm (approximately). Planing cutting conditions are as follows: frequency; 21.5 kHz, amplitude; 15 μm, cutting speed; 8 m/min, cutting depth ; 0.10 mm, feed; 0.20-0.23 mm, nose radius; 1.0 mm (approximately). The main results obtained by experiments are as follows: 1) The chips formed by the vibrating diamond tool are unoxidized flow type chips white gray coloured. 2) Under the conditions, tool failures scarcely occured. 3) Machined surface roughness almost coincide with the theoretical roughness. 4) It is proved that the steel hardened as far as hardness HRC 57 can be machined precisely by vibrated diamond tool ultrasonically.抄録全体を表示PDF形式でダウンロード (19902K) -
加工開始前の早期安定化について佐田 登志夫, 竹内 芳美, 大久保 信行, 佐藤 和信1975 年 41 巻 485 号 p. 592-597
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーTo obtain high accuracy in the machining operation, the change of the thermal deformation must be as small as possible during operation. Large changes of thermal deformation take place in the warming-up period after starting the operation of the machine, while the change of the deformation becomes less with increasing operation time and approaches the steady state value. The rapid access to the steady state of the deformation is desirable at the initial stage to reduce the warming-up time of the machine. To attain this goal two methods have deen developed in this paper, which utilize either additional or existing heat sources. The former method consists of installing an artificial heat source at a suitable location and supplying the energy to the structure during a certain period after starting an operation. In the latter method the spindle is operated at higher rotation speeds than required for a certain period to give the excess energy to the structure in the initial stage of operation. Both controlling methods are applied to a jig grinding machine. The optimal condition by these controlling methods is determined and proved experimentally.抄録全体を表示PDF形式でダウンロード (3495K) -
断続切削の基礎研究(第3報)稲見 靖, 井川 直哉1975 年 41 巻 485 号 p. 598-603
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーBased on the quantitative analysis of the mechanism of an increased tool wear in interrupted cutting, a tool of so-called sandwich structure is proposed for the improved wear resistivity.The tool can be designed by the procedures described in the paper, to have the sufficient damping capability due to its viscous intermediate layer with little reduction in the rigidity. The damping parameter can be controlled by changing the material constants and the thickness ratio of the individual layers which compose the tool. The cutting test shows that, on a tool of the sandwich structure with the intermediate layer of the molded polyvinyl chloride, the flank wear in an interrupted cutting can be reduced to less than a half of the case on a conventional tool.抄録全体を表示PDF形式でダウンロード (10419K) -
誘導用浮動型慣性センサに用いる磁気軸受方式の研究(第2報)滝沢 実, 大月 正男, 鈴木 孝雄1975 年 41 巻 485 号 p. 604-609
発行日: 1975/06/05
公開日: 2009/06/30
ジャーナル フリーIn order to develop more precise inertial sensors such as floated gyros and accelerometers which will be used in inertial navigation system, a passive magnetic suspension system with an eight-pole stator, which can be applied to supporting the output axes of these sensors, is experimentally studied. Formery in 1st Report, a theoretical analysis of the magnetic suspension system was described. This study is precise measurement of magnetic suspension forces related to displacement of the output axis by means of the experimental models of the magnetic suspension system mounted on the testing equipment which is produced for this experiment. These experimental models are designed according to the analytical results which were given by authors in the previous report, and the size of the models is determined so that the models could be applied to actual inertial sensors. The measured magnetic suspension stiffness of the experimental models is about 10 gw/μm, and the value is large enough to support the output axes of the inertial sensors. And then it is shown that the experimental results of the magnetic suspension forces are in close accordance with the analytical results within a small displacement of the output axis. Furthermore it is shown that the experimentally obtained unstable regions of the magnetic suspension forces are narrower than those obtained analytically. Thus the result of the experimental study can be applied to design the magnetic suspension system.抄録全体を表示PDF形式でダウンロード (1114K)
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