Note: Heating fastener blanks for thread rolling

Objective:

Heating steel fastener blanks to 1500 °F (816 °C) for thread rolling 

End Product:

steel fastener blanks

Equipment:

  • Ambrell 5 kW induction heating system, equipped with a remote workhead containing two 1.25 μF capacitors for a total of 0.625 μF
  • An induction heating coil designed and developed specifically for this application.

Materials:

H11 tool steel, A286 stainless steel, Titanium and 8740 alloy steel fastener blanks of various sizes. Typical size is 1 in (25.4mm) diameter, 1.5 in (38.1mm) long 

Temperature:

1500 °F (816 °C)

Frequency:

214 to 216 kHz depending on part

Testing:

A four-turn helical coil is used to heat the shaft of the bolts to 1500 °F (816 °C). The 1 in (25.4mm) diameter H11 fastener blank requires 30 seconds to reach temperature. The heating cycles varies from 20 to 45 seconds depending on the size of the part.

Benefits:

  • Faster cycle times and extended tool life with preheat step  

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

  • Using same coil for various size blanks

  • Stronger and more fatigue-resistant threads 

Heating fastener blanks for thread rolling

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