Note: Annealing brass and bronze tubing (handrail bending)

Objective:

Annealing brass and bronze tubing for bending in a mandrel bender to form handrails 

End Product:

Handrails

Equipment:

  • Ambrell 6 kW induction heating system, equipped with a remote workhead containing two 0.5 μF capacitors for a total of 0.25 μF
  • An induction heating coil designed and developed specifically for this application. 

Materials:

  • Brass tubes 1.5 in (38.1mm) and 2 in (50.8mm) diameter with 0.065 in (1.65mm) wall thickness
  • Bronze tubes 1.5 in (38.1mm) and 2 in (50.8mm) diameter with 0.100 in (2.54mm) wall thickness 

Temperature:

1000 °F (538 °C)

Frequency:

228 kHz

Testing:

A twelve turn helical coil is used to heat an 8 in (20.3cm) area 3 in (7.6cm) above the end of the tube. Each of the four tubes require a different heat cycle and time to reach the required temperature.

Benefits:

Induction heating provides:

  • High efficiency, low energy costs

  • Precise and controllable placement of heat

  • Hands-free heating that involves no operator skill for manufacturing

  • Even distribution of heating, eliminating fractures during bending 

Annealing brass and bronze tubing (handrail bending)

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