1 min read

Shrink Fitting an Assembled Wrist Pin into a Connecting Rod

Shrink Fitting an Assembled Wrist Pin into a Connecting Rod

A client contacted THE LAB at Ambrell looking to assemble connecting rods. Their company was looking for better control of the heat delivered to the assembly than their flame delivered. THE LAB determined that an Ambrell EASYHEATTM 3.5 kW, 150-400 kHz induction heating system with a six-turn helical coil would be ideal for this induction shrink fitting application.

That six-turn helical coil was used to heat the connecting rod for 13 seconds. The coil was perpendicular to the axis of the bore to promote even heating around the circumference. The connecting rod was then assembled with the piston for shrink fitting. The application was successful and met the client's time and quality objectives. 

For this application, induction heating offered several advantages. It offered more accurate control of heat, as induction only heated the knuckle as opposed to the whole part. With induction, they were able to use a lower temperature than with the flame which prevented discoloring. Additionally, with induction's precise heating there was no product contamination. Finally, induction increased productivity due to its repeatability and easy of operation. 

 

THE LAB at Ambrell has a significant amount of experience with induction shrink fitting applications. To learn more about free application testing, visit our page with more information about THE LAB or contact us today to get the process started. 

More Shrink Fitting Application Notes

Ambrell Heads to WESTEC and The Battery Show

Ambrell Heads to WESTEC and The Battery Show

The busy fall tradeshow schedule continues, with Ambrell set to exhibit at two more events next week: WESTEC 2025 in Anaheim, CA and The Battery Show...

Read More
Ambrell to Showcase Induction Heating Solutions at CMTS 2025

Ambrell to Showcase Induction Heating Solutions at CMTS 2025

Toronto, ON | September 29 – October 2, 2025

Read More
Ambrell to Exhibit at FABTECH 2025 and ICSCRM 2025

Ambrell to Exhibit at FABTECH 2025 and ICSCRM 2025

Ambrell Induction Heating Solutions will be exhibiting at two industry tradeshows in the coming weeks: FABTECH 2025 in Chicago, Illinois, and ICSCRM...

Read More