Note: Releasing a Lens Grinding Fixture Bond
Objective:
A fixture used in lens grinding uses a metallic bond to secure the glass form to the fixture during grinding. Induction is used to release the lens from the bonding material
End Product:
Lens Grinding Fixture
Equipment:
Ambrell 5kW induction heating system
Coil: custom-designed helical coil
Workhead: two 1.5μF capacitors (Total 0.75μF)
Materials:
bonded grinding fixtures; Teflon-coated helical coil
Temperature:
55 °C (130 °F)
Frequency:
355 kHz
Testing:
The bonded assembly is placed (glass up) within a helical coil which circles the bonding slug. Induction heats the material to the melting point in 5-7 seconds. Upon melting, the lens is released from the fixture, the fixture drops away.
Benefits:
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Efficiency: the bond is released cleanly, in a very few seconds
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Economy: energy is applied only where required
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