Skip to content Skip to main navigation Skip to search
Shrink-fitting with induction heating

Induction shrink fitting

Our systems are used in the automotive industry to shrink fit gears and rings. They are also employed to repair planes, trains and trucks. Our mobile systems are used for shrink fitting tasks on offshore platforms and are increasingly used to remove the giant nuts and bolts in the turbines of power stations.
Close

What is shrink fitting?

Typically, metals will expand in response to heating and contract when it is cooling. This dimensional response to temperature change is known as thermal expansion. Induction shrink fitting is where we use this effect to either fit or remove parts. A metal component is heated to between 150 °C and 300 °C which causes it to expand and allow for the insertion or removal of another component. When, for example, fitting two parts of pipe together, one part is heated until its diameter is expanded enough to be fitted over the other part. When the adjoined parts return to ambient temperature, the joint becomes strained and strong – ‘shrink fitted’. Likewise, thermal expansion can be used loosen the joint before disassembly.


What are the benefits?

Process controllability, consistency, accuracy and speed are key benefits of induction shrink fitting. Induction heat delivery is very accurate. Due to the heat being generated within the component, you only heat the part you want to heat, not the atmosphere around it. As well as reducing the risk of ovality, this is energy efficient. Additionally, since induction produces extremely uniform consistent heat, this often allows less heat to be used. Temperature control is accurate with precise control of ramp-up times and holding temperatures. Unlike traditional heating methods, induction involves no naked flame. This allows induction shrink fitting to be used in a wide variety of applications in volatile environments, in particular in petrochemical applications.

 

Where is it used?

A wide variety of industries and applications can benefit from induction shrink fitting. Our systems are used in the automotive industry to shrink fit gears, bearing and rings. They are employed in the mechanical industry as well as in the maintenance of planes and trains. Our mobile systems are used for shrink fitting tasks on ships and offshore platforms and are increasingly used to fit and remove the giant nuts and bolts in the turbines of power stations as well as the bearings and shafts in wind power generators.

Learn more

Induction heating for shrink-fitting
Induction shrink-fitting

The innovative EFD Induction shrink-fitting system can heat any size of motor house for electrical motors and pumps.

Download

Videos

Shrink fitting

EFD Induction systems are used in the automotive industry to shrink fit gears and rings. They are also employed to repair planes, trains and trucks. Our mobile systems are used for shrink-fitting tasks on offshore platforms. And are increasingly used to remove the giant nuts and bolts in power stations’ turbines.

Images

Induction heating is ideal for disassembling and shrink-fitting bearing and lock rings

Disassembling and shrink-fitting bearing and lock rings

Disassembling and shrink-fitting bearing and lock rings

Bearing rings can be heated in a completely uniform manner and removed while the shaft remains cold.

Shrink-fitting with induction heating

The innovative EFD Induction shrink-fitting system can heat any size of motor house for electrical motors and pumps.

Shrink-fitting with induction heating

MOTOR HOUSE: A semi-automated system with integrated conveyor belt for easy i­­ntegration in production line.

Shrink-fitting with induction heating

EFD Induction offers innovative solutions for shrink-fitting of motor houses.

Minac induction heating system with power cable

Minac with heating cable - frequently used for shrink fitting applications

Shrink-fitting with induction heating

More and more automotive sub-contractors are opting for induction heating to shrink-fit gear wheels.

Shrink-fitting with induction heating

Induction heating used for changing the shafts of the old bridge

Shrink-fitting with induction heating

Shrink fitting with flexible heating cable

Shrink-fitting with induction heating

Disassembling and assembling of bearing rings at a railway repair shop.

Shrink-fitting with induction heating

Manual solution for shrink-fitting of motor house.

Shrink-fitting with induction heating

MOTOR HOUSE: A fully-automated system with robot handling.

Shrink-fitting with induction heating

MOTOR HOUSE: A semi-automated system with manual loading and unloading.

Induction heating at oil processing plants

Induction heating is a time- and labour-saving alternative to ineffecient flame and resistance heating for oil and gas processing plants, chemical plants and power stations.

Induction heating - bolt expansion

The use of induction heating for bolt expansion in power stations is a powerful business tool.

Preheating with induction heating

An operator replaces a bearing that has been heated with an EFD Induction mobile Minac system.

Shrink-fitting with induction heating

EFD Induction has delivered numerous solutions for shrink-fitting of stator housings.