Induction Hardening of Stapler Cartridges

Materials
Double stapler cartridge, 0.64” (16.25 mm) x 0.54”(13.71 mm) x 0.8”(20.32 mm) heat length, 0.0425”(1.07 mm) thick magnetic steel

Key Parameters
Power: Up to 10 kW
Temperature: 1400°F – 1600°F (760°C – 871°C)
Time: Average 3.5 seconds

Results and Conclusions:

Testing was then done using a short channel/open coil which provided better heat distribution across the part. The positioning of the part in the coil makes a difference in how it heats. The temperature was verified using a dual color Williamson pyrometer with an accuracy of +/- 3.6^◦F. The 10kW system can bring up the part up to 1400^◦F (760^◦C) to 1500^◦F (815^◦C) plus in an average of 3.5 seconds. Temperature was checked on the outside and the inside staple cartridge with a temperature difference of 50^◦F to 100^◦F (10^◦C to 37.7^◦C) or less depending on heat time. Temperature was measured on the inside of the parts before quenching. All parts were quenched in Quenchfast quenching oil.

Pictures