Note: Annealing stainless steel caps (dental)

Objective:

To anneal a variety of part sizes of a common shape in-line (continuously) from a high speed punch press. 

End Product:

stainless steel dental crowns

Equipment:

Ambrell 3542LI 3.5 kW induction heating system, equipped with a remote workhead containing two 1.5μF capacitors
An induction heating coil designed and developed specifically for this application. 

Materials:

304L stainless steel caps 

Temperature:

1600-1800 °F (870-980 °C)

Frequency:

308 kHz

Testing:

A 3-turn coil is used for the heating pattern. Sample cap is placed on a copper tube (slotted to reduce heat-loss) and inserted into a quartz tube which is filled with nitrogen. RF energy is applied for a cycle time of 500 milliseconds. Three S.S. cap sizes (0.295" to 0.397 in  OD) Each one of the three cap sizes were heated at two different settings. Requirement to anneal large quantities of work-hardened crowns suggests induction for precise, controllable heating. Since oxidation is unacceptable in the finished product, Induction is the appropriate choice for heating in an inert atmosphere.

Benefits:

 Induction heating provides:

  • Rapid, repeatable results

  • Integration-friendly equipment for high-speed automation

  • Operability in an inert atmosphere 

Annealing stainless steel caps (dental)

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