Development of
Small-sized and Simplified Sinker Electrical Discharge Machining (EDM)
Machine
Hiroyuki KidoTsukuba University of Technology Course of Design/Process Systems Department of Industrial Information Division of Industrial Technology
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Electrical Discharge Machining (EDM)
Electrically isolated
Arc
Vaporization
Removed MaterialPressur
e
EDM is a non-contact type method of thermal machining using electricity, and thus EDM can work irrespective of the hardness of workpiece. EDM is regarded as one of special machining methods.
Figure 1 Machining Process
Objectives
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•Develop and operate a machine using an unique machining method of EDM.
•Understand the mechanism and principle of EDM
•Apply the research results to actual manufacturing.
Assembly of Small-sized and Simplified EDM (SSEDM)
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1Clean damper
2Stepping motor
3Displacement gauge
4Coupling
5Threaded shaft
6Shank holder
7Motor bracket
8Slide
9Stage
10Vise
Figure 2 Assembly Drawing of SSEDM
Overview of SSEDM
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EDM Machine
Control Panel
Ion Exchange Unit *
Figure 3 Overview of SSEDM* Reference :Manufacture of de-ionized water circulation system : Wataru Nozoe : System Technology Special Research : 2010
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Main Control Items
Figure 4 Control Panel
Drive FrequencyBase VoltageMotor Connection
Power Connection
Pow
er
Stop
Up
Down
Acceleration
Base Voltage Check
Drive Frequency Check Contact Detection
Servo Control
Semi-auto Control
Drive Signal
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Figure 6 Contact Detection
Stop
Figure 5 Servo Control
To slide the electrode up and down to keep the machining voltage equal to the base voltage.
Figure 7 Semi-auto Control
Main Control Items
To see how many mm the electrode was consumed by.
(1)Servo Control
(2) Contact Detection
(3) Semi-auto Control
Machining Mechanism
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Workpiece
Figure 8 Machining Mechanism
Electrode
Mirror
Trial Machining
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Figure 10 Machining Result
Figure 9 Machining Situation
Machining Eccentricity
・ Workpiece : Stainless Steel Pipe with a diameter of 1.5 mm・ Electrode : Lead for Mechanical Pencil・ Machining Time : 51sec.
Crushing
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Summary
•A small-sized EDM machine (SSEDM) was developed.
•SSEDM performed machining with small dimension.
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