Induction Heating Layout for Hardened Sheet Metal Pressing
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Solution Overview
Problem
Existing hardening methods for sheet metal products, such as using high-power lasers, are inefficient and slow due to the need for sweeping the entire trace to be heated, and using multiple lasers increases costs.
Innovation Solution
A method involving induction heating in a heating station where a coil induces currents in a front metal layer, with a short-circuiting arrangement on the rear side, allowing simultaneous heating of selected areas, followed by pressing and cooling in the pressing station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-power laser is used to heat sheet metal, then heating can be performed, but the process is slow because the laser beam has to sweep the entire trace that needs to be heated
Solution Approach 1:
The heating process is segmented into multiple independent heating zones along the sheet metal trace. Each zone has its own induction heating element, allowing simultaneous heating of multiple segments rather than sequential sweeping with a single laser beam. This parallel processing approach dramatically reduces the total heating time while maintaining precise temperature control in each segment.
2Productivity
If multiple lasers are used to speed up heating, then heating efficiency improves, but costs increase significantly
Solution Approach 1:
The patent replaces the mechanical laser sweeping system with an electromagnetic induction heating system. Instead of using multiple expensive laser beams that require precise mechanical positioning and synchronization, the invention uses induction heating elements that generate eddy currents directly in the sheet metal, producing heat through electromagnetic induction. This substitution eliminates the need for complex laser positioning mechanisms while achieving faster and more uniform heating across multiple zones simultaneously.
3Reliability
If traditional forge heating is used, then hardening can be achieved, but the process is time-consuming and less precise in controlling heated areas
Solution Approach 1:
The induction heating system enables precise local quality control by independently controlling the heating intensity and duration in each segmented zone along the sheet metal trace. The heating elements can be selectively activated or deactivated to heat only specific areas that require hardening, while leaving other areas unaffected. This selective heating capability provides both the precision needed for high-quality hardening and the efficiency required for rapid production, as only the necessary portions of the sheet metal undergo the time-consuming heating and cooling cycle.
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 enables efficient and uniform heating and cooling of sheet metal, resulting in improved hardening properties and faster production times.
Implementation Method 1
heating selected areas of the sheet metal piece in the heating station by means of induction. In the heating station, a coil induces currents that flow in a front metal layer
Implementation Method 2
a coil induces currents that flow in a front metal layer on a front side of the coil
Data Source
AI summary
The present disclosure relates to a method and a corresponding arrangement for producing a hardened sheet metal product. The method includes placing a sheet metal piece in a heating station and heating selected areas of the sheet metal piece in the heating station by means of induction. In this process, a coil induces currents that flow in a front metal layer on a front side of the coil. Opposing ends of the front metal layer are interconnected by a low resistance short-circuiting arrangement running on a rear side of the coil. The short-circuiting arrangement comprises a material with lower resistivity than the front metal layer. The heated piece is moved to a pressing station, where it is pressed while the heated areas are cooled.