Electromagnetic Upper Nozzle Removal of WEDM Cutoff Cores
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Solution Overview
Problem
Conventional wire-cut electrical discharge machining methods require significant manual labor to remove cutoff waste materials, especially for small or large cores with complex geometries, as existing attraction and removal technologies are ineffective for such materials.
Innovation Solution
A method and device utilizing an electromagnet to magnetize and demagnetize a metallic upper nozzle for automatic attraction and removal of magneto-conductive cores, employing a motion system to move the core to a target area and then dropping it into a trash device, with optional water spray or scraping mechanisms for effective core removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual labor is used to remove cutoff waste materials, then all sizes and geometries of cores can be removed, but significant manual labor and time are required
Solution Approach 1:
The patent replaces manual mechanical removal with an electromagnetic field-based system. An electromagnet generates a magnetic field that automatically attracts and removes ferromagnetic cores from the workpiece, eliminating the need for manual picking and significantly improving both automation extent and productivity.
Solution Approach 2:
The electromagnetic attraction system enables the machining process to automatically remove its own waste materials. The system detects the presence of cores, activates the electromagnet to attract them, and removes them without external intervention, making the removal process self-service and highly efficient.
2Ease of operation
If a permanent magnet is used to attract machined material, then attraction is achieved, but the permanently magnetized device is easy to permanently magnetize the machined material and magnetic induction influences physical properties
Solution Approach 1:
The patent uses an electromagnet instead of a permanent magnet, making the magnetic field dynamic and controllable. The electromagnetic field can be activated only when needed for attraction and deactivated afterward, preventing permanent magnetization of the workpiece and eliminating harmful magnetic induction effects on material properties.
Solution Approach 2:
The electromagnet operates in periodic cycles: activated to attract cores during removal operations, then deactivated to release them. This periodic on/off operation ensures attraction capability when needed while preventing unwanted permanent magnetic effects on the machined material.
3Productivity
If vacuum device is used to remove waste materials, then negative pressure generates lift force, but effectiveness is greatly reduced for waste material with rough, step-like, porous or uneven surface
Solution Approach 1:
The patent replaces the vacuum-based mechanical removal system with an electromagnetic attraction system. The electromagnetic field acts on the ferromagnetic material itself regardless of surface condition, providing universal effectiveness for cores with rough, step-like, porous, or uneven surfaces that vacuum devices cannot handle.
4Productivity
If Bernoulli clamper is used to remove waste material, then high and low pressures generated by sprayed positive pressure liquid flow are utilized, but cannot effectively remove waste materials in small sizes (diameters less than 4mm)
Solution Approach 1:
The patent replaces the fluid-dynamic Bernoulli clamper system with an electromagnetic attraction system. The electromagnetic field provides direct attractive force on ferromagnetic cores regardless of size, effectively removing small-diameter cores (less than 4mm) that cannot be removed by pressure-based fluid 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
Significantly reduces manual labor and improves the efficiency of core removal by enabling automatic and precise handling of cores across various sizes and geometries, enhancing the automation of the mold machining process.
Implementation Method 1
A method and device utilizing an electromagnet to magnetize and demagnetize a metallic upper nozzle for automatic attraction and removal of magneto-conductive cores
Implementation Method 2
attracting a core capable of being completely cut off and separated in a workpiece
Data Source
AI summary
A method and device for removing an electromagnetic core, the method including: using an electromagnet to magnetize or demagnetize a metallic upper nozzle when a magneto-conductive workpiece is cut off in a WEDM manner; attracting a core capable of being completely cut off and separated in the workpiece; utilizing the metallic upper nozzle to detect whether attracted; if the core is attracted, moving the core to a target area; demagnetizing and dropping the core in a trash area. The device is applied to a WEDM machine; after the metallic magneto-conductive upper nozzle is magnetized by the electromagnet, the upper nozzle is used to attract the magneto-conductive core; a metallic water spray cover is utilized to detect whether the core is attracted; the core is moved to the target area by a motion system of the WEDM machine, and dropped in a trash device after the upper nozzle is demagnetized.