Wire Electrode Welded Spots in EDM Part Retention
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Solution Overview
Problem
Conventional wire-cut electrical discharge machining requires additional steps and devices to prevent cut-out parts from falling apart, which can lead to tilting, short circuits, and damage due to the need for separate isolation and recovery processes, and often results in inefficient machining time.
Innovation Solution
The method involves creating partially welded spots between the cut-out part and the workpiece using arc discharge to fuse the wire electrode, allowing for easier separation by breaking the welded spots with external force, eliminating the need for additional cutting steps and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wire-cut electrical discharge machining is used to cut out parts from workpieces, then the cutting operation can be completed, but additional steps and devices are required to prevent cut-out parts from falling apart, which increases device complexity and machining time
Solution Approach 1:
The patent combines the cutting function and the part-retention function into a single integrated wire electrode system. The wire electrode simultaneously performs cutting through electrical discharge and creates welded spots that prevent the cut-out part from falling apart, eliminating the need for separate isolation and recovery devices and reducing overall device complexity
Solution Approach 2:
The wire electrode is given multiple functions: it acts as both the cutting tool for electrical discharge machining and the welding tool for creating retention spots. This multi-functional approach eliminates the need for additional specialized devices for part isolation and recovery, thereby improving productivity
2Reliability
If additional devices are used to prevent cut-out parts from falling apart, then part stability is improved, but the machining process becomes more complex and time-consuming
Solution Approach 1:
The welded spots are created during the cutting process itself, before the cut-out part is fully separated from the workpiece. This preliminary retention action ensures part stability throughout the machining process without requiring additional post-processing steps or separate stabilization devices, thus avoiding time loss
3Productivity
If cut-out parts are completely separated from the workpiece during machining, then the cutting is complete, but the parts may tilt and cause short circuits leading to damage
Solution Approach 1:
The welded spots act as a protective cushion that prevents the cut-out part from tilting and causing short circuits. By creating these retention spots during the cutting process, the system provides beforehand protection against harmful effects that would otherwise occur upon complete separation of the part
4Reliability
If uncut spots are left to keep parts attached to the workpiece, then part retention is achieved, but additional cutting steps are required to complete the separation
Solution Approach 1:
The patent changes the nature of the retention mechanism from uncut material bonds to welded spot bonds. By using electrical discharge to create localized welded spots instead of leaving uncut spots, the system achieves part retention without requiring additional cutting steps to complete separation, as the welded spots can be easily broken without further machining
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
This approach reduces machining time by integrating the welding process into the cutting operation, preventing part tilting and damage, and enabling efficient separation of the cut-out part from the workpiece without additional processing steps.
Implementation Method 1
spark discharge energy occurring when a gap voltage is applied across a wire electrode and a workpiece
Implementation Method 2
creating partially welded spots between the cut-out part and the workpiece using arc discharge to fuse the wire electrode
Data Source
Figure 1
Figure 2~3(B)
Figure 4
AI summary
There is explained a method of cutting out a part (26) from a workpiece (6) with making partially welded spots in wire electrical discharge machining to keep the part (26) against falling apart away from the workpiece (6). The cut-out parts (26) are cut off at a time after breakage of the welded spots (20) caused by an external impact. The electric processing condition applied across an inter-electrode space between the wire electrode (5) and the workpiece (6) is changed from a cutting phase to a welding phase in which the wire electrode (5) is fused partially to weld together the cut-out part (26) and the workpiece (6) at the fused spot (20) on the wire electrode (5).