Offset Electrode Guide for Accurate Small-Hole EDM Drilling
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Solution Overview
Problem
Existing small-hole electric discharge machines face challenges in accurately positioning electrodes for drilling non-straight holes due to the complexity introduced by using bent or slanted electrodes, which complicates the machining process and programming.
Innovation Solution
A small-hole electric discharge machine with an electrode guide that shifts parallel to the spindle axis by a predetermined distance, supported by an electrode guide support device, allowing for precise positioning of the electrode at a machining point without increasing program complexity, enabling drilling of holes not aligned with the spindle axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electrode is bent 90 degrees or extended at a slant to access narrow spaces, then the electrode can reach machined parts in narrow spaces, but the machining program complexity increases and positioning accuracy deteriorates
Solution Approach 1:
An electrode guide is introduced as an intermediary component between the spindle and the workpiece. The guide has a hollow part through which the electrode passes, allowing the electrode to be positioned at an offset from the spindle axis while maintaining parallel alignment. This intermediary structure enables access to narrow spaces without requiring the electrode itself to be bent or slanted, thus keeping the machining program simple.
Solution Approach 2:
The system is segmented into distinct functional components: the spindle, the electrode guide, and the electrode. The electrode guide is supported by a support device that can be positioned independently, allowing the electrode to be located at a predetermined offset position. This segmentation allows the electrode to reach narrow spaces while maintaining a simple, straight configuration.
2Adaptability or versatility
If an electrode is bent 90 degrees or extended at a slant to drill non-straight holes, then holes not on a straight line with the spindle can be drilled, but electrode positioning accuracy deteriorates
Solution Approach 1:
The electrode guide acts as a mediator that decouples the electrode orientation from the spindle axis. The guide maintains the electrode in a parallel state relative to the spindle axis while allowing lateral offset positioning. This enables accurate positioning at predetermined locations without the complexity of bent electrodes.
Solution Approach 2:
The electrode guide support device positions the electrode guide at predetermined positions and angles before machining begins. This preliminary positioning ensures that the electrode is accurately located at the required offset position parallel to the spindle axis, eliminating positioning errors that would occur with bent or slanted electrodes.
3Adaptability or versatility
If an electrode is bent 90 degrees or extended at a slant, then the electrode can access narrow spaces, but the operational complexity increases
Solution Approach 1:
The electrode guide serves as a mediator that handles the complexity of positioning, allowing the operator to work with a simple, straight electrode as if it were coaxial with the spindle. The guide absorbs the operational complexity by providing a predetermined offset position, making the machine easy to operate while maintaining the ability to access narrow spaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates accurate electrode positioning and simplifies machining program preparation, allowing for easier drilling of holes not on a straight line with the spindle, reducing operational complexity compared to conventional bent or slanted electrode methods.
Implementation Method 1
an electrode guide having a hollow part through which the electrode is passed and guiding the electrode at the front end of the hollow part in a parallel state with respect to an axis of the spindle while shifted by a predetermined distance from the axis
Implementation Method 2
an electrode guide support device supporting the electrode guide so that a position of the front end of the electrode guide in direction of the axis of the spindle and an angular position about the axis become predetermined values
Implementation Method 3
applying voltage between a small-hole machining-use electrode attached to a spindle and a workpiece attached to a table to drill a small hole in the workpiece by electric discharge energy
Data Source
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AI summary
A small-hole electric discharge machine applying voltage between a small-hole machining-use electrode (116) attached to a spindle (112) and a workpiece attached to a table (118) to drill a small hole in a workpiece by electric discharge energy, the small-hole electric discharge machine including an electrode guide (10) having a hollow part through which the electrode is passed and guiding the electrode at the front end of the hollow part in a parallel state with respect to an axis (Rz) of the spindle while shifted by a predetermined distance (S) from the axis and a W-axis chuck holding an electrode guide to be able to measure and maintain a position of a front end of the electrode guide in direction of the axis of the spindle and an angular position about the axis.