Curing Speaker Cone Epoxy

Objective

Heat the top surface of a speaker basket to cure epoxy between the basket and a paper insert. 

End Product

Audio speaker cone

Equipment

• Ambrell 5kW induction heating system equipped with a remote workhead

• An induction heating coil designed and developed specifically for this application 

Materials

Steel Speaker Cone Measuring 6.5" (165.1mm) by 9.125"(231.8mm)

Temperature

375°F (190.6°C) to 425°F (218.3°C)

Frequency

138 kHz

Testing

A two turn helical coil with concentrator plate is used to heat top area of the speaker basket where the epoxy is located. The epoxy cures in 3.5 seconds at a temperature of 400ºF (204.4ºC). 

Benefits

• Minimized coating defects

• Repeatable results

• Faster production times 

Image