Wire EDM Electrode Pin Contact Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wire electric discharge machines face challenges in reliably switching between rough machining and finish machining power sources, leading to inconsistencies in machining speed and surface roughness due to uncertainties in the contact state between the wire electrode and the electrode pin, which can result in reduced precision and potential damage to the workpiece.
Innovation Solution
A wire electric discharge machine equipped with a short-circuit detection mechanism and a controller to determine the contact or non-contact state between the electrode pin and the wire electrode, using a switch to ensure the same electric potential and a cleaning fluid jetting device to maintain attachment/detachment conformity, thereby ensuring accurate switching between machining conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a movable electrode pin or driving mechanism is used to switch between rough machining and finish machining power sources, then the machining speed and surface roughness can be improved, but the reliability of power source switching deteriorates due to uncertain contact state detection
Solution Approach 1:
The patent replaces the mechanical contact detection method with an electrical detection method. Instead of relying on mechanical switches or position sensors to detect whether the electrode pin contacts the wire electrode, the invention uses electrical continuity detection through the power supply line to determine the contact state, thereby improving switching reliability
Solution Approach 2:
The patent implements a feedback mechanism where the contact state between the electrode pin and wire electrode is continuously monitored through electrical detection. The detection result is fed back to the control system, which automatically adjusts the power source selection based on the actual contact state, ensuring reliable switching between rough and finish machining modes
2Device complexity
If the contact state between electrode pin and wire electrode is not accurately detected, then the device complexity is reduced, but the manufacturing precision deteriorates due to incorrect power source selection
Solution Approach 1:
The patent makes the power supply line serve multiple functions: it not only supplies power for machining but also acts as a detection circuit for contact state monitoring. This multi-functional design eliminates the need for separate detection circuits, maintaining simple device structure while ensuring accurate machining precision through reliable power source selection
3Reliability
If cleaning fluid jetting is added to maintain electrode pin attachment, then the reliability of contact state is improved, but the device complexity increases
Solution Approach 1:
The patent introduces cleaning fluid as an intermediary substance to maintain the contact reliability between the electrode pin and wire electrode. The cleaning fluid removes contaminants that could interfere with electrical contact, thereby improving attachment reliability without requiring complex mechanical cleaning mechanisms
Solution Approach 2:
The patent uses hydraulic or pneumatic systems to deliver cleaning fluid to the electrode pin contact area. This allows efficient cleaning of the contact surface through fluid pressure, improving contact reliability while keeping the cleaning mechanism relatively simple compared to mechanical scraping or brushing systems
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
The solution enables reliable detection and management of the contact state between the wire electrode and the electrode pin, ensuring consistent machining performance, improving machining speed and surface roughness by preventing errors during power source switching, thus protecting the workpiece from damage.
Implementation Method 1
short-circuit detection means for detecting a short circuit between the wire electrode and the workpiece
Implementation Method 2
a switch to make the wire electrode and the workpiece have the same electric potential
Implementation Method 3
a cleaning fluid jetting device to jet cleaning fluid to the attaching/detaching mechanism
Data Source
Figure 1
Figure 2a~2f
Figure 3
AI summary
A wire electric discharge machine capable of detecting a contact and non-contact of an electrode pin to a wire electrode. The wire electric discharge machine has a plurality of machining power sources with respective power supply lines to be selected according to machining conditions, one polarity of each set of the power supply lines is electrically connected to a wire electrode through an electrode pin, and the other polarity of each set of the power supply lines is electrically connected to a workpiece. The wire electric discharge machine comprises an air cylinder for attachment/detachment of the electrode pin to/from the wire electrode, a short-circuit detection circuit for detecting a short circuit between the wire electrode and the workpiece, with one polarity electrically connected to the electrode pin, and the other polarity electrically connected to the workpiece, and a first relay for making the wire electrode and the workpiece have the same potential, and a controller for determining a contact/non-contact between the wire electrode and the electrode pin using the short-circuit detection circuit and the first relay.