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Volume 17 (1983 - 198･･･
- Issue 34 Pages 1-
- Issue 33 Pages 1-
Volume 17, Issue 34
Displaying 1-4 of 4 articles from this issue
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Flat-Bottomed Shape Forming Using Automatic Electrode Wear Length Measuring-Compensating MechanismMasamitsu TSUCHIYA, Tsutomu KANEKO, Katsuya SUGANO1984 Volume 17 Issue 34 Pages 1-12
Published: March 31, 1984
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe method of this forming is progressed in the similar process as the milling machine using ball end mill. But in EDM, it is necessary to compensate the remarkable electrode wear length. In this research, some experiments are performed to form the shape using automatic electrode wear length measuring-compensating mechanism, and the relations between electrode wear process by machining condition and shape of the machined surface are considered. The results obtained above are as follows: (1) By the automatic compensation of the electrode wear length, the machining can be progressed with keeping the shape of worn electrode almost constant. (2) By giving the appropriate machining condition, the practical surface can be obtained. (3) By using a hollow electrode, the roughness of surface can remarkably be improved.View full abstractDownload PDF (928K) -
Yoshitsugu MUKOYAMA, Isao OGATA1984 Volume 17 Issue 34 Pages 13-29
Published: March 31, 1984
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn electric discharge machining (EDM), metal removal phenomena and quality of products are affected by the mass transfered and degenerated surface layer formed on the workpiece material, consequently the nature and behavior of the degenerated layer must by studied precisely.
In this paper, the surfaces of eroded electrodes (tool electrode and workpiece) were observed qualitatively and quantitatively by ultimate analysis to show their connection with working conditions and others, employing mainly scanning electron microscope and X-ray microanalyser.
Consequently, it became clear that the condition of eroded electrodes was influenced considerably by electrode polarity, peak discharge current (Ip), energy supplying duration (τ), working area, materials combination (thermophysical properties) of electrodes and the others.
The changes of material and condition on surface of tool electrode in process of EDM affect the mechanism of electron emission and others, in its turn influence considerably to working (removal) characteristics. And further, as the changes of material and condition on eroded workpiece convert its thermophysical properties, working (removal) characteristics are affected hardly.View full abstractDownload PDF (11183K) -
Flat-Bottomed Shape Forming By Automatic Estimate-Compensating Method For Electrode Wear LengthMasamitsu TSUCHIYA, Tsutomu KANEKO, Shin'ichi SHOHDA1984 Volume 17 Issue 34 Pages 30-42
Published: March 31, 1984
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn the three dimensional EDM, it is neccesary to make appropriate compensation for electrode wear. In the previous report, it was proved that the machining can be progressed with keeping the shape of the worn electrode almost constant by using the automatic measure-compensating method for electrode wear length. Followed from the previous report, this report describes some experiments of estimate-compensating method without the measuring movement. From the results the following became clear mainly. (1) The electrode wear characteristics on flat-bottomed shape forming are able to be expressed numerically by parameters of the wear beginning point and the slope of the tangent to the characteristic curve of the electrode wear length. And by these data, it is possible to perform the estimate-compensating machining. (2) In this method, it is neccesary to set the slope of the tangent to the curve and appropriate compensating distance as the data into the machining program and also is neccesary to establish the beginning point of the compensating movement. (3) The slope of the tangent to the curve changes according to the shape of electrode at every moment but by continuation of this machining the shape of worn electrode is settled almost constant.View full abstractDownload PDF (3736K) -
Tateoki MIYAUCHI, Hiroshi YAMAGUCHI1984 Volume 17 Issue 34 Pages 43-50
Published: March 31, 1984
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSLaser trimming conditions of thick film resistors for hybrid ICs were studied. An acoustooptic Q-switched YAG laser was applied to Pd-Ag thick film resistors.
Results of the study show that factors which determine good laser trimming conditions are pulse repetition rate, speed of the laser spot on Pd-Ag resistors, laser power density and defocusing length. Findings show that laser power density for Pd-Ag thick film resistors of 500Ω/_??_ to 20kΩ/_??_ was about 12kw/cm2, and the necessary repetition rates were 7kHz and 10kHz when speeds of the laser spot were 25mm/s and 39mm/s. It was also made clear that laser trimming characteristics were not affected if the defocusing length was within±1mm when focusing distance was between 47mm and 63mm, and increase of electrical noise depended upon the mean laser power used for trimming. Trimming accuracy was affected by the leak power of laser between pulses and the change of resistance during trimming.View full abstractDownload PDF (4585K)
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