Induction heating with structural feedback

Reference number 2018-04292
Coordinator Lunds universitet - Avdelningen för Industriell Produktion, Lunds Universitet
Funding from Vinnova SEK 500 000
Project duration November 2018 - November 2019
Status Ongoing
Venture Banbrytande idéer inom industriell utveckling
Call Banbrytande idéer inom industriell utveckling 2018

Purpose and goal

The purpose of the project is to determine how the information from an induction coil can be used to estimate the structural properties of a magnetic material and the accuracy of the estimation. The goal is to show how accurately structural properties can be calculated in a continuous induction heating process (eg band heating) where the induction coil is both used for heating (below the Curie temperature) and measurement. In addition, clarify whether the structural information given can be used as feedback to the heating process.

Expected results and effects

To maximize the potential of a material´s properties and to do this in a resource-efficient and energy-efficient way, will be a key technology for the future. Quality control at an early stage allows manufacturers to make smarter choices in how the process should be managed to achieve the intended end product. We think this idea, for example, can enable in-line annealing with induction, where results are easy to control and the process generates amounts of in-line structural data that can later be used for traceability and to teach the system, i.e. machine learning.

Planned approach and implementation

The annealing tests consist of hardening multiple samples that are put into an oven. Samples are taken out at predetermined times, then cooled down. By interrupting the annealing after different times, you get different characteristics which will be analyzed by conventional methods. In parallel, relevant electromagnetic properties are measured on a toroid winding with a high temperature cable. Magnetic properties depend on steel grades, where alloying materials and microstructure have a significant impact. As a test material, we initially choose to focus on SS2244 (42CrMoS4).

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