巻号一覧
2 巻 (1968)
- 3 号 p. 1-
2 巻, 3 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
-
倉藤 尚雄, 増沢 隆久1968 年 2 巻 3 号 p. 1-16
発行日: 1968/09/01
公開日: 2010/03/12
ジャーナル フリーThis paper consists of two parts. One contains experimental results about micro-drilling of cemented carbide alloys by EDM, leading to industrial application. The other is theoretical analysis of the wear ratio, characteristic in EDM performed by very low energy pulses (<3μJ/pulse).
The results are as follows.
1. Micro-holes with diameters of 6μm and 9μm were drilled to cemented carbide alloy of 50μm thick by EDM.
Rectangular micro-holes (approximately 40μm×45μm) were machined to the same workpiece by EDM. It takes only 10-15sec. for each of them.
2. The erosion ratio, (cathode erosion)/(anode erosion), extremely decreases as the energy of each one pulse decreases, independently of materials of electrodes. For example, the ratio is some 10% in most materials when the capacity of condenser is 500pF and the charging voltage is 100V.
3. The cause of the fact mentioned above has been explained with T-F theory and Mackeown's Formula, as a result lead from the increase of je/j, where je is current density by electrons and j is the total current density.抄録全体を表示PDF形式でダウンロード (3942K) -
藤本 良三, 戸嶋 成忠1968 年 2 巻 3 号 p. 17-31
発行日: 1968/09/01
公開日: 2010/03/12
ジャーナル フリーRecently, the industrial applications of electron-beam melting, such as welding, evaporation, cutting of thin film resistor and working of semi-conductor, have developed rapidly.
But electron-beam machines have complex structure, and it is considerably difficult to operate.
The authors designed the simple electron-beam machine for trial, and worked semi-conductors.
The experimental results and discussions are as follows;
1) Cracks of high melting point materials by D. C electron-beam compared with pulsed beams: the former is bigger about twice or three times than the latter, and shows about twice in depth.
2) By electron-beam bombardment to N-type Ge single crystals are formed miniature recrystallizations.
And this part of recrystallization converted N-type to P-type.
The authors studied electrical characteristics of them.
3) By electron-beam welding alloyed In with N-type Ge, and observed V-I characteristics of P-N junction.
4) As application of electron-beam spot welding, made InSb alloy on N-type Ge single crystal by way of experiment, and obtained the growth of tiny InSb crystals like small branch.抄録全体を表示PDF形式でダウンロード (14515K) -
加工機構について倉藤 尚雄, 向山 芳世1968 年 2 巻 3 号 p. 32-47
発行日: 1968/09/01
公開日: 2010/03/12
ジャーナル フリーThe relation of the discharge energy, discharge duration and electrode material to the melting depth at a discharge point is calculated theoretically from the expression of the thermal conduction, and thus the discharge removal phenomenon is explained from the viewpoints of the melting depth and the suitable discharge duration for melting that can obtain the maximum melting depth.
Further, the removal quantity and the diameter and depth of the discharge crater are measured in relation to the results of such calculations, and it is confirmed that the results of the calculations agree well with those of experiments.
Then, the explanation of the discharge removal phenomenon by the thermal conduction theory is supplemented from observations on such phenomena as the creation of metalic oxides on the discharge surface, the creation and accumulation of materials of the carbon group, the transference of material from the electrode on the opposite side.抄録全体を表示PDF形式でダウンロード (1436K) -
パルス重畳効果元木 幹雄, 李 賛中, 中島 正男1968 年 2 巻 3 号 p. 48-56
発行日: 1968/09/01
公開日: 2010/03/12
ジャーナル フリーThe present paper describes on a research of the electrode erosion phenomena, which were caused by repeating transient arc discharge across a narrow gap between electrodes immersed in a dielectric liquid.
The arc current wave at the gap is such a compositive waveform as a pulse current superposed on the fundamental current with square wave. The square wave current and the pulse current are obtained by using transistorized circuit and capacitor circuit respectively.
It became clear that the characteristic of the electrode erosion is remarkably influenced by the phase and shape of waveform of the pulse current which is superposed on the square wave current.抄録全体を表示PDF形式でダウンロード (2599K) -
伊東 祐光1968 年 2 巻 3 号 p. 57-70
発行日: 1968/09/01
公開日: 2010/03/12
ジャーナル フリーElectrode gap distance is very important in electrochemical machining, because it influences the machining accuracy and the electrode correction is founded on it. In this report equations on the gap distance were mathematically derived.
(1) The equilibrium gap distance he (cm) is derived as follows he=η·Ex/v·k/ρ where η is current efficiency, E is gap voltage (V), x is specific electrical conductance (Ω-1cm-1), v is feed rate of electrode (cm/s), k is electrochemical equivalent (g/C), ρ is density of work material (g/cm3).
(2) Considering the concentration of hydrogen gas bubbles and the temperature rise of electrolyte, the equilibrium gap distance is modified as follows h′e-he(1+0.44EρH/(1-ρH))·2(1-ρH)/(2+ρH) where h′e is modiffied equilibrium gap distance, ρH is volume concentration of hydrogen gas bubbles.
(3) From these equations the foundamental contour machined is determined. The optimum stock removal from rough machining to finish is related to the contour accuracy.抄録全体を表示PDF形式でダウンロード (834K)
- |<
- <
- 1
- >
- >|