Induction Bonding of Steel Detail to Non-Conductive Ring

Objective: A customer with long-term experience in the Appliance and HVAC industry wants to replace the old induction heating equipment and needs to verify the results with an application test.

For this induction heating application test, we have to bond a steel detail to a non-conductive ring. The steel part must be heated in order to cure the adhesive and bond a gasket to the steel part. The components are magnetic and are parts from rotary vane pumps.

The client wants to reach shortened heat cycle time – max 20 seconds with a max heating temperature of 200°C. The equipment will be build-in an automated bonding production line. One of the test goals was to confirm if we can tune the customer provided coil to our system.

Industry: Appliances and HVAC

Equipment: We used an UltraHeat SM – 5kW Induction Heater. This system was ideal for this induction bonding application, and we successfully connected the customer’s coil to our induction heating machine.

Process: In this induction bonding application test we had to heat a steel detail with a very big size – 114.75 (OD) x 50 (ID) mm. A bonded ring dimension was 105.3 (OD) x 92.3 (ID) mm and 2.15 mm in thickness.

We made some calculations and set up the equipment to 4kW of power. To confirm the max desired temperature and not overheat the part, we decided to use a tempilaq paint for 204°C. With these settings, we achieved a heat cycle time of 12 sec.

After the test, our additional measurements showed that the customer’s coil efficiency is around 50%. We recommend designing a custom induction coil. A special inductor produced for this application will increase the efficiency of the system.

Benefits: Some of the induction bonding benefits for this customer application are improved energy efficiency, greater process control, increased repeatability, low maintenance requirements, and of course, increased productivity.

Reference Info: Application Note 3464-7167

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