Open Trim Edge Induction Heating With Opposed Coils
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Solution Overview
Problem
The existing methods for heating the end surface of an open trim edge in high tensile strength steel plates are inefficient due to current dispersion, reducing the current density and heating efficiency.
Innovation Solution
A processing method involving the use of heating coils disposed in a non-contact manner along the end surface of the open trim edge, with opposing current directions on either side to concentrate current and induce electromotive force, ensuring the end surface is sandwiched diagonally between the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a loop-shaped heating coil is disposed along the end surface of the trim edge in a non-contact manner, then the end surface can be heated without contact, but the current disperses away from the end surface and flows in the inside of the steel plate, reducing current density and heating efficiency
Solution Approach 1:
The heating coil is divided into two separate coils (first heating coil and second heating coil) positioned on opposite sides of the end surface. Each coil independently generates magnetic flux that penetrates the end surface, preventing current dispersion and concentrating heating effect on the target surface without contact.
Solution Approach 2:
The magnetic flux density is concentrated locally at the end surface by positioning the heating coils on both sides. The first heating coil generates magnetic flux from one side while the second heating coil generates magnetic flux from the opposite side, creating localized high current density precisely where heating is needed.
2Loss of energy
If the heating coil is positioned to concentrate current on the end surface, then heating efficiency improves, but the positioning must be precise to avoid current dispersion
Solution Approach 1:
By segmenting the heating system into two coils positioned on opposite sides, the patent reduces the precision requirement for each individual coil. Even if one coil is slightly mispositioned, the other coil compensates, ensuring continuous effective heating without requiring high positioning precision.
Solution Approach 2:
The dual-coil configuration provides a cushioning effect against positioning errors. The overlapping magnetic flux fields from both sides ensure that slight deviations in coil placement do not result in current dispersion, maintaining heating efficiency despite manufacturing tolerances.
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 enhances heating efficiency by concentrating current density on the end surface, allowing for stable and intensive heating even with slight positional variations, thus improving the removal of residual strain and facilitating the formation of stretch flanges.
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
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
Implementation Method 3
concentrating current density on the end surface, allowing for stable and intensive heating
Data Source
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.