Forging Industry
Fontijne Grotnes expanders are commonplace in the forging industry for sizing rings of all sizes and materials. The advantages of the Fontijne Grotnes expander in the ring rolling process or forging industry are:
- Achieving very tight inside diameter and ovality tolerances
- Fontijne Grotnes has a unique method of measuring the inside diameter of the ring during and shortly after the expanding process.
- This measuring system can also be used to gauge (measure) the ring after the expanding process, while still hot on the expander.
- Keeping these very tight tolerances and consistency result in reducing the amount of machining, therefore material savings and time savings.
- Improvement of mechanical properties by exceeding material yield strength up to 20% which can lead to using a start off material with lower mechanical properties and therefore saving cost
Wind Turbine Industry
Metal components make up nearly 90% of the weight and over one-third of the value of a modern wind turbine. Along with the growing demand for wind turbines comes equal growth in demand for forged parts that are integral to their operational efficiency. The seamless rolled rings used in most wind turbines measure up to 6 meters in diameter and 12 tons in weight.
For the production of wind turbines Fontijne Grotnes has designed an expander for sizing seamless rolled rings for slewing bearings. By allowing the turbine to rotate efficiently remaining on track with the wind, slewing bearings constitute an essential part of wind turbine equipment and help transform wind power into electric power. Sizing seamless rolled rings is necessary for specific parts in wind turbines, such as:
- Blade bearings
- Yaw bearings
- Tower flanges
- Wind gear boxes
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