Middle Frequency Heater

The Middle Frequency Heater is an induction heating unit that uses a coil wound around or placed inside a metal workpiece to generate fast, even heat. It can heat many types of material: steel, stainless steel, titanium, copper alloys, together with metals that are either magnetic or non-magnetic. Settings can be made by temperature or by time. Thanks to middle frequency technology, heat is transferred efficiently into the surface of the component. Suitable for mounting, dismounting and pre-heating, as well as industrial maintenance. The unit saves energy. It uses no flame and produces no smoke or dust. Operation is safe and flexible across many workpiece shapes and sizes.

The Middle Frequency Heater uses a flexible coil wound around the workpiece. Its main, basic function is to heat metal workpieces up to 180 degrees or 300^o, depending on the coil. Middle Frequency Quick Heater = MFQH. The unit works on most metal workpieces, magnetic or non-magnetic, such as Cu – Titanium – Iron – Stainless steel – Duplex – Super Duplex. Settings can follow a time cycle or a max – min temperature setting.

Schaeffler MF induction heating – middle frequency technology. Applications include mounting, dismounting and pre-heating of metal components. The induction generator with middle frequency technology is suitable for both thermal mounting and dismounting. By using middle frequency technology, energy is transferred efficiently to the workpiece. As a result, the workpiece is heated easily and quickly.

The MF Quick Heater consists of a generator with a fixed or flexible induction coil. Its compact size makes it easy to move. Its principle and application differ completely from a high frequency heater. Many people confuse the two, yet they are not the same. The advantages of the wire-wound heater compared with traditional methods are explained in detail below.

Frequently asked questions about the workpiece to define the application range

Your detailed requirement information helps us approach your application efficiently. The survey forms below help you record the criteria systematically.

The Schaeffler MF Quick Heater saves time. It can be deployed quickly with fewer operations. It heats faster than traditional methods. Energy use is more efficient thanks to lower power consumption.

Advantages of the Schaeffler MF Quick Heater

A major benefit of this type of induction heater is that it is not limited to cylindrical components. The flexible induction coil can be wound around any size or shape. This makes it easy to heat large and heavy components.

• Suitable for mounting, dismounting and pre-heating.
• Suitable for steel, cast iron, stainless steel and titanium.
• Heating controlled by temperature and/or time.
• Dual temperature measurement (ΔT monitoring).
• Low connection power (32/63 Amp).
• Generator adjustable from 2.5 to 3.5/10/22/44 kW.
• Easy to use and flexible.
• Suitable for production and maintenance applications.
• No residual magnetism.
• No fire risk, as no open flame is used.
• No noise, exhaust gas or smoke.
• Air cooled: no water cooling required.
• Because the work is carried out without damage, expensive parts can be reused.
• A flexible or fixed induction coil is recommended depending on the application.

Which components can the wire-wound heater be used for?

The Schaeffler MF Quick Heater consists of a generator and one or more induction coils. The generator is designed to connect induction coils used to heat magnetic workpieces. Suitable materials include iron, steel, stainless steel, titanium and some copper alloys. The maximum power the workpiece can take is 3.5, 10, 22 kW or 44 kW, depending on the heater model.

• Bearings
• Labyrinth seals
• Bearing rings
• Bearing housings
• Gears
• Rollers
• Tubes
• Bushings
• Couplings
• Train wheels/train wheel tyres
• Presses
• Stator housings

Operating principle: Three-phase current is rectified and smoothed. The rectified current is then converted into alternating current. The frequency of this current is 10 to 25 kHz. The conversion is carried out by an inverter. The power is then applied magnetically to the workpiece through a ‘resonance capacitor’ using an induction coil (winding).

Because the frequency is relatively high, the penetration depth of the magnetic field is not very great, so only the outer layer of the workpiece is heated. This principle makes middle frequency heating particularly suitable for dismounting purposes, such as removing bearings from a shaft.

1. Flexible induction coils can be placed inside or around a workpiece. They therefore suit a wide range of large parts, from large inner rings to very large components such as gears and housings.
2. Fixed induction coils are used for series work. Fast set-up time and high process reliability are important here.

For special applications, we can carry out preliminary tests with components that the customer provides for this purpose. If required, we can supply a customised solution. For standard applications, we have a large database of examples.

We also use simulation programs. By providing optimised solutions, we achieve considerable savings. In practice, the savings are measurable. This is ensured simply by working without causing damage. Parts can therefore be reused.

Schaeffler MF Quick Heater middle frequency heater

This is an advanced technical approach. It is used to heat metal components such as bearings, bearing rings, gears and tubes, along with many other parts in industry. The unit combines a generator with one or more induction coils. It can efficiently heat magnetic materials such as iron, steel and stainless steel. It also heats titanium and some copper alloys.

It works on the principle of converting three-phase current into alternating current. The frequency of this current is 10 to 25 kHz. The power is then applied to the workpiece through the induction coil. This concentrates the heat in the outer layer of the workpiece. That makes the unit well suited to dismounting, for example removing a bearing ring from a shaft without causing damage.

The Schaeffler MF Quick Heater offers a choice of flexible and fixed induction coils, depending on the specific requirements of the job. Flexible induction coils allow heating of parts with a wide variety of shapes and sizes, from large inner rings to bulky components such as machine housings. Fixed induction coils, meanwhile, suit series production work. They offer fast set-up time and high process reliability.

One of the notable advantages of this unit is the saving in time and energy. It also minimises the risk of damage to parts, allowing them to be reused without affecting quality. This reduces costs and helps protect the environment as well.

The unit is also equipped with advanced features such as temperature and time control, dual temperature measurement and air cooling. The middle frequency unit is useful for both production and maintenance applications. The Schaeffler MF Quick Heater can provide customised solutions, using extensive data from standard applications together with simulation programs to optimise the solution and achieve considerable savings for the user.