Fundamental Study on Hole Fabrication Inside a Hole by Means of Electrical Discharge Machining

2014 ◽  
Vol 8 (5) ◽  
pp. 773-782 ◽  
Author(s):  
Tohru Ishida ◽  
◽  
Yuichi Okahara ◽  
Masahiko Kita ◽  
Akira Mizobuchi ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Degrees Of Freedom ◽  
Electrical Discharge Machining ◽  
Simple Device ◽  
Fundamental Study ◽  
Hydraulic Equipment ◽  
Inside Wall

It is necessary to machine holes of complicated shapes for building pipelines of pneumatic or hydraulic equipment. However, the degrees of freedom of machinable hole shapes are limited, because holes are usually fabricated by drilling. To improve the degrees of freedom of these shapes, the authors have devised a method of fabricating a hole on the inside wall of another hole by means of electrical discharge machining. The method employs a very simple device. The results of the fundamental experiments indicate that this method has the ability to machine such a hole.

A Magnetic Drive Actuator for Micro Electrical Discharge Machining

2012 ◽  
Vol 591-593 ◽  
pp. 303-306
Author(s):  
Xiao You Zhang ◽  
Akio Kifuji ◽  
Dong Jue He
Keyword(s):  
Electrical Discharge ◽  
High Speed ◽  
Degrees Of Freedom ◽  
Electrical Discharge Machining ◽  
Magnetic Coupling ◽  
Magnetic Bearings ◽  
Coupling Mechanism ◽  
Micro Electrical Discharge Machining ◽  
Long Stroke ◽  
Magnetic Drive

Electrical discharge machining has the capability of machining all conductive materials regardless of hardness, and has the ability to deal with complex shapes. However, the speed and accuracy of conventional EDM are limited by probability and efficiency of the electrical discharges. This paper describes a three degrees of freedom (3-DOF) controlled, wide-bandwidth, high-precision, long-stroke magnetic drive actuator. The actuator can be attached to conventional electrical discharge machines to realize a high-speed and high-accuracy EDM. The actuator primarily consists of thrust and radial magnetic bearings, thrust and radial air bearings and a magnetic coupling mechanism. By using the thrust and radial magnetic bearings, the translational motions of the spindle can be controlled. The magnetic drive actuator possesses a positioning resolution of the order of micrometer, a bandwidth greater than 100Hz and a positioning stroke of 2mm.

Fundamental Study on Addition of Osteoconductivity to Titanium Alloy Surface by EDM

2017 ◽  
Vol 11 (6) ◽  
pp. 869-877 ◽  
Author(s):  
Togo Shinonaga ◽  
◽  
Yuta Iida ◽  
Ryota Toshimitsu ◽  
Akira Okada
Keyword(s):  
Rheumatoid Arthritis ◽  
Titanium Alloy ◽  
Bone Tissue ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Alloy Surface ◽  
Artificial Joint ◽  
Joint Function ◽  
Fundamental Study ◽  
Joint Shape

In recent years, one common cure for losses in joint function caused by osteoarthritis or rheumatoid arthritis is replacement with an artificial joint. For this reason, it is necessary to add osteoconductivity to artificial joint component surfaces that make contact with bone, thereby reducing the period of time necessary to fixate the bone tissue and the artificial joint component. With the intent of efficiently machining the joint shape by electrical discharge machining (EDM) and simultaneously formation of a surface with osteoconductivity, this study discusses the possibility of adding osteoconductivity to a titanium EDMed surface.

C015 Fundamental Study on Hole Fabrication inside a Hole by Means of Electrical Discharge Machining

2013 ◽  
Vol 2013.7 (0) ◽  
pp. 373-376
Author(s):  
Tohru ISHIDA ◽  
Yuichi OKAHARA ◽  
Masahiko KITA ◽  
Akira MIZOBUCHI ◽  
Keiichi NAKAMOTO ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Fundamental Study

Elementary Study on the Creation of Cross Section's Changing Holes by Means of Electrical Discharge Machining

2009 ◽  
Vol 3 (5) ◽  
pp. 592-601 ◽  
Author(s):  
Tohru Ishida ◽  
◽  
Yuichi Mochizuki ◽  
Yoshimi Takeuchi ◽  
Keyword(s):  
Cross Sections ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Electrical Discharge Machine ◽  
New Method ◽  
Mechanical Parts ◽  
Translational Movement ◽  
Discharge Machine ◽  
The Creation ◽  
Inside Wall

This study deals with the development of a new method to machine holes whose cross sections variously change along their axes. Machined holes have straight axes and constant circular cross sections, since holes are generally machined by drills. In other words, the shapes of machined holes do not have much variety. This study, however, develops a new, elementary device which can machine a certain shape on the inside wall of a straight hole by means of electrical discharge machining. This results in the creation of holes with variously changing cross sections. The aforementioned device consists of an electrode for electrical discharge machining and some mechanical parts, and is installed on a die-sinking electrical discharge machine (EDM). The device and EDM operate as a reciprocating block slider crank mechanism, so a translational movement of the main axis of the EDM can be converted into a rotational movement of the electrode. As a result, shapes which are identical to the envelope of the locus of the electrode movement can be machined. This leads to the creation of a semicircular space on the inside wall of a straight hole by starting the machining after setting the electrode in the hole. Experimental results show that, by changing the shape of the electrode, the device can produce variously shaped, semicircular spaces inside a straight hole. This proves that the new method of machining has the ability to create holes which have complicatedly changing cross sections.

scholarly journals Development of an Electrode Motion Control Device for Curved Hole Electrical Discharge Machining

2008 ◽  
Vol 2 (6) ◽  
pp. 447-456 ◽  
Author(s):  
Tohru Ishida ◽  
◽  
Yasuhito Miyake ◽  
Koji Teramoto ◽  
Yoshimi Takeuchi ◽  
...  
Keyword(s):  
Motion Control ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Water Channels ◽  
Control Device ◽  
Experimental Results ◽  
Curved Channels ◽  
Hydraulic Equipment ◽  
Curved Hole ◽  
Hole Machining

This study deals with the development of a new curved hole machining device which has been improved to diversify the shapes of the curved holes it produces. Holes are generally bored with drills, so they are straight. As a result, mechanical designers are limited to designing products with straight holes in them, even though straight holes may not be optimal for the products they design. This often becomes a problem when designing the water channels in molds or the pipelines used in pneumatic components or hydraulic equipment, since curved channels or curved pipelines would be optimal yet it is impossible for drills to produce them. To solve this problem, a method of machining curved holes is required, so the authors have developed devices which can produce them. Previous to this study, the most recent device was mechanically controlled, and the curved holes it produced were limited in shape. The device has been improved, and the latest device is controlled via software. Experimental results indicate that the improved device has much higher controllability of the shape of the curved holes it produces.

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