Steel Plate Trim-Edge Heating for Residual Strain Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for processing steel plates face challenges in effectively removing residual strain at the trim edge without overheating other areas, leading to cracking and damage during the press-forming of high tensile strength steel.
Innovation Solution
A method involving the use of heating electrodes to specifically target and heat the trim edge of a punched steel plate, using induction heating to reduce residual strain while avoiding overheating other areas, with the heating temperature controlled between 200°C and the Ac1 point to prevent softening or hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end part of a steel plate is heated to remove residual strain, then residual strain can be removed, but areas other than the end part are excessively heated, causing a change in hardness
Solution Approach 1:
The heating electrodes are positioned to apply heat locally only to the end part of the steel plate where residual strain exists, rather than heating the entire plate. This localized heating approach removes residual strain from the end part while maintaining appropriate hardness in other areas, resolving the contradiction between effective strain removal and avoiding excessive heating.
2Reliability
If heating electrodes are used to heat the trim edge, then residual strain can be removed, but the heating process may cause damage to the steel plate surface
Solution Approach 1:
An insulator part is introduced as an intermediary between the heating electrodes and the steel plate surface. The insulator allows the electrodes to be positioned close to the trim edge for effective heating while preventing direct contact that would cause surface damage. This mediator enables residual strain removal without the harmful effect of electrode-induced surface damage.
3Reliability
If a current is applied to heat a bent part of a press formed product, then residual strain can be removed, but the heating method is difficult to apply to punched end parts
Solution Approach 1:
The heating method is adapted by changing the configuration and positioning parameters of the heating electrodes to suit punched end parts. The electrodes are positioned to face each other with the trim edge between them, creating a localized heating field appropriate for the geometry of punched parts. This parameter adjustment makes the current removal method applicable to punched end parts while maintaining effective strain removal.
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 effectively removes residual strain at the trim edge while minimizing damage to the flange die and preventing overheating, enhancing the formability of the steel plate and reducing the risk of cracking.
Implementation Method 1
each of the heating electrodes may be a coil electrode for generating an induced electromotive force in the steel plate to carry out the heating
Implementation Method 2
each of the heating electrodes may be a coil electrode for generating an induced electromotive force in the steel plate
Implementation Method 3
heating a part of the steel plate including the trim edge
Data Source
AI summary
A method for processing a steel plate capable of removing residual strain at a trim edge thereof without causing overheating in areas of the steel plate other than the trim edge. A method of processing a steel plate includes punching a steel plate and disposing heating electrodes in such a way that a trim edge punched in the punching is positioned between electrode surfaces facing each other and then heating a part of the steel plate including the trim edge.