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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.

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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.

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Induction shrink-fitting

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

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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

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.

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

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

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

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

Induction heating used for changing the shafts of the old bridge

Shrink fitting with flexible heating cable

Disassembling and assemblingof bearing rings at a railway repair shop.

Manual solution for shrink-fitting of motor house.

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

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.

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

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

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

News

Heated interest at Alihankinta

The number-one industrial fair in Finland was once again a big success for EFD Induction Sweden.

Ideal for the railway industry

The Minac – EFD Induction’s mobile induction heating equipment – is so well suited for key tasks in the maintenance of rolling stock that one of the largest European railway service companies has purchased no less than ten and are considering investing in even more.

Tube boiler extraction

Have you enjoyed a sweet snack today? If so, there is a good chance that the sugar came from Brazil, where EFD Induction is now offering their service and equipment rental to sugarcane mills. Our Minacs are the ideal tool for changing the tube connections on boilers.

EFD Induction expertise used for bridge repair

EFD Induction Norway has fixed a local historical bridge. The bridge was built in 1957 and is equipped with two motors.

Staying on track

Alessandro Mariani of EFD Induction Italy explains how induction shrink-fitting keeps the trains running.

Induction technology on track

The unrivaled accuracy, control and efficiency of induction heating makes it ideal for key tasks in the manufacture and maintenance of rolling stock and rails.

Induction shrink fitting