Bonding a stainless steel needle to a plastic shank

Objective

To heat a stainless-steel needle within a plastic shank to form a dental perforator

End Product

Dental perforator

Equipment

Ambrell EASYHEAT^TM 1.2 kW, 150-400 kHz solid state induction power supply with a workhead and coil specifically designed for this application.

Materials

Stainless steel needle 0.017” (0.43 mm) OD, and plastic shank.

Temperature

356 ° F (180 °C)

Frequency

359 kHz

Testing

A pancake/plate coil was used in this application. Ten assemblies were placed in the coil and power was applied for 1 second to melt the plastic to the stainless steel needle and achieve a 5 kg pull out strength. 3,000 parts could be processed per day with this setup. 

Benefits

• Consistent, repeatable and reliable bond

• More stable and reliable bond compared to ultra-sonic heating

• Faster process time

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

• Even distribution of heating

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