巻号一覧
32 巻 (1998)
- 71 号 p. 10-
- 70 号 p. 1-
- 69 号 p. 1-
32 巻, 70 号
選択された号の論文の10件中1～10を表示しています
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コンデンサ放電の効果申 泰民, 山田 久, 毛利 尚武, 古谷 克司, 福澤 康, 谷 貴幸1998 年 32 巻 70 号 p. 1-7
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーBecause of the high resistivity of insulating ceramics, there are some differences compared with the EDM of metallic materials. The secondary metal as an assisting electrode and a minus polarity of the electrode overcame the difficulties of machining for insulating ceramics. And the insertion of a condenser between the electrode and the workpiece improves the removal rate and the stability in electrical discharge machining for insulating ceramics. But there is no distinct explanation of the mechanisms. In this paper, we certified the mechanism and the effects of the condenser EDM for insulating ceramics as Si3N4, Sialon and SiC.
There are two types of the electrical discharge waveforms in the condenser EDM of insulating ceramics. A high electrical resistance of the surface causes a discharge with longer pulse duration than the settled value of discharge duration, which produces a lot of carbon from the working oil by heating. The low electrical resistance generates short discharge pulses which waste the carbon gradually. These waveforms are affected by a discharge-detection voltage, an equivalent resistance of ceramics' surface, and electrical parameters of discharge circuits. An adequate balance of a long pulse and short pulses makes it possible to machine insulating ceramics with high removal rate and high stability.抄録全体を表示PDF形式でダウンロード (2180K) -
第2報 放電位置に応じたギャップ信号の区分検出法小原 治樹, 安部 充, 大住 剛1998 年 32 巻 70 号 p. 8-15
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーIn the 1st report we investigated about 3 gap monitoring signals: discharge voltage, ignition delay time and a radio signal just before wire breakage, in order to know which of them is the best signal to pre-monitor the wire breakage during wire EDM. Results showed that the discharge voltage is the best signal by which to pre-monitor the wire breakage. But other signals were not so clear.
In the present report, we propose a new detecting method dividing these signals into groups according to discharged locations. This method clarify an abnormal gap state just before the wire breakage. Finally, we discuss a model of wire breakage that is able to explain obtained experimental results.抄録全体を表示PDF形式でダウンロード (1071K) -
第1報, 荒加工の溝幅とワイヤ振動振幅, ギャップの関係小原 治樹, 上脇 寿仁, 大住 剛1998 年 32 巻 70 号 p. 16-23
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーIn this series reports, we deal with accuracy of Wire EDM from rough cutting to finish cutting discussing about reasons of spoiled precisions.
In this first report, we investigate about the relation between cut groove width, wire vibration amplitude and gap length of the rough machining, and also about the relation between them and some EDM conditions.
The wire vibration amplitude is measured with a optical fiber-slit detecting system. The gap length is calculated from ignition delay time using an experimentally obtained relationship between the ignition delay time and the gap length for a single discharge. The ignition delay time is calculated from mean working voltage and other EDM conditions.
Results shows that the cut groove width is the sum of the wire diameter, the wire vibration amplitude and the double of gap length. The wire vibration amplitude is proportionally increasing with discharge frequency from the value of wire vibration amplitude caused by a single discharge, and also increasing with the gap length.
It is clarified that the cut groove width is less sensitive to OFF duration of discharging pulse if the mean working voltage was used for a servo feed back system or if the mean working voltage was constant, because the increasing of gap length cancels the decreasing of wire vibration amplitude when the OFF duration was increased.抄録全体を表示PDF形式でダウンロード (827K) -
宇野 義幸, 岡田 晃, 山田 知彦, 林 泰弘, 田渕 義晨1998 年 32 巻 70 号 p. 24-31
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーAluminum bronze which has high corrosion resistance, high strength and easy castability is recently expected as a new plastic mold or a shell mold core material in place of steel conventionally used. On the other hand, it is reported that the EDMed surface with metal powder mixed fluid has smaller surface roughness and higher resistance to corrosion. From these points of view, EDM characteristics of aluminum bronze were experimentally investigated in the first place. Then, EDM with nickel powder mixed fluid for smoother surface roughness and higher surface integrity was proposed and evaluated. Main conclusions obtained in this study are as follows:
(1) The metal removal rate in EDM of aluminum bronze is approximately the same as that of steel, and no electrode wear EDM is possible.
(2) The EDMed surface with nickel powder mixed fluid has a smaller surface roughness than that in conventionl EDM with kerosene type fluid.
(3) Resolidified layer containing nickel can be generated and the thickness of the layer becomes larger and uniform with an increase of nickel powder concentration in machining fluid.
(4) The EDMed surface with nickel powder mixed fluid becomes harder than that with kerosene type fluid and it has high resistance to sand abrasion.抄録全体を表示PDF形式でダウンロード (8332K) -
南 久, 増井 清徳, 塚原 秀和, 萩野 秀樹1998 年 32 巻 70 号 p. 32-39
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーA new coloring method for titanium alloy by using EDM process is proposed. With this method, the requested colored surface is obtained during the finishing Wire-EDM process in a dielectric water without any other post treatment. In this paper, the coloring mechanism for titanium alloy and the influence of the processing condition to the color tone are discussed.
The results obtained are as follows:
(1) A molten and resolidified surface created by electrical discharge process is colored directly by the interference phenomena in the anodic oxide film formed with electrolytic affection.
(2) The thickness of the oxide film determines the color tone, so it can be possible to give various kind of colors by controlling the average working voltage.抄録全体を表示PDF形式でダウンロード (7431K) -
窪田 真一郎, 宇野 義幸, 西原 尚信, 高木 俊1998 年 32 巻 70 号 p. 40-48
発行日: 1998/07/31
公開日: 2010/03/12
ジャーナル フリーThis paper deals with machining methods of fine graphite electrode for EDM by Q-switched Nd: YAG laser. Graphite is a superior material as an electrode for EDM and has widely been used. However, it is difficult to make a complicated shape of thin graphite plate less than 1mm by the conventional machining methods because of its brittleness. In this paper, Q-switched Nd: YAG laser is used for machining the micro rectangular parallelepiped graphite electrode whose thickness is 0.35mm.
Main conclusions obtain are as follows:
1. The rectangular parallelepiped whose sections is about 0.35mm square can be machined precisely by Q-switched YAG laser.
2. Cutting off method of 2 plates of workpieces together leads to a better rectangular parallelepiped shape of the lower plate.
3. The roughness of machined surface is improved by another scanning with lower power laser.
4. In normal polarity EDM with RC circuit in deionized water, a better rectangular hole can be generated with copper impregnated graphite electrode.抄録全体を表示PDF形式でダウンロード (11327K) -
1998 年 32 巻 70 号 p. 77a
発行日: 1998年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (677K) -
1998 年 32 巻 70 号 p. 77b
発行日: 1998年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (677K) -
1998 年 32 巻 70 号 p. 77c
発行日: 1998年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (677K) -
1998 年 32 巻 70 号 p. 77d
発行日: 1998年
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (677K)
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