Open Trim Edge Induction Heating for Concentrated End-Surface Current
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Solution Overview
Problem
The existing method for heating the end surface of an open trim edge in steel plate processing is inefficient due to current dispersion, reducing current density and heating efficiency.
Innovation Solution
A processing method involving the use of a non-contact heating coil arrangement where the current direction on one side of the heating coil is opposite to the other side, sandwiching the end surface diagonally between upper and lower heating coils, with specific positional relationships to enhance current concentration and heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a loop-shaped heating coil is disposed along the end surface of a trim edge to heat the end surface, then residual strain can be reduced, but current disperses away from the end surface forming a loop inside the steel plate, reducing current density and heating efficiency
Solution Approach 1:
The heating coil is divided into multiple separate coils (first heating coil and second heating coil) positioned at different locations. Each coil independently generates electromagnetic induction on its respective end surface, preventing current dispersion and concentrating current density where heating is needed, thereby improving heating efficiency while maintaining temperature control.
2Productivity
If the heating coil is positioned to sandwich the end surface between upper and lower coils with opposite current directions, then current density is concentrated on the end surface improving heating efficiency, but the device complexity increases
Solution Approach 1:
Multiple heating coils are combined in a coordinated arrangement where the first and second heating coils work together with opposite current directions. This merging of multiple coils creates a focused electromagnetic field that concentrates current density on the end surface, achieving efficient heating while the coordinated operation simplifies the overall system control.
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 method improves heating efficiency by concentrating current density on the end surface, allowing for more effective residual strain reduction and stable heating even with slight positional variations of the heating coils.
Implementation Method 1
heating the end surface of the open trim edge by applying an alternating current to the heating coil to generate an induced electromotive force on the steel plate
Implementation Method 2
applying an alternating current to the heating coil to generate an induced electromotive force on the steel plate to thereby heat the end surface
Data Source
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AI summary
It is possible to improve heating efficiency of an end surface of an open trim edge. A processing method includes punching a steel plate to open a part of an end surface of the steel plate to form an open trim edge, and disposing a heating coil in a non-contact manner along the end surface of the open trim edge formed in the punching to sandwich the end surface of the open trim edge therebetween, and heating the end surface of the open trim edge by applying an alternating current to the heating coil to generate an induced electromotive force on the steel plate. A current direction of the heating coil disposed on one side of the end surface of the open trim edge is opposite to a current direction of the heating coil disposed on another side of the end surface of the open trim edge.