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In the aviation sector, landing gears are a focus of VTN. End customers include Airbus, Embraer, COMAC and other aircraft manufacturers. However, VTN also hardens many other components for civil or military aviation. In the space segment, for example, items for satellites are heat-treated.
VTN is certified according to the customer base according to NADCAP.
The process offers ideal conditions for highly sensitive components from tool and mould making, plant engineering, medical technology, food technology and aerospace. Components are hardened under controlled vacuum at up to 1,300 °C. Heating takes place under vacuum and subsequent quenching with up to 20 bar nitrogen overpressure. The aim is to produce surfaces free from decarburization and oxidation, eliminating the need for further mechanical processing.
Sustainability factor:
the process is particularly sustainable and environmentally friendly, as it does not generate any direct emissions and can be run on renewable energies.
Gas nitriding is a thermochemical surface hardening process without microstructure transformation at low temperatures of approx. 500 to 570 °C. Nitriding ensures hard surfaces and provides high resistance to wear, scratches and abrasion. In gas nitrocarburisation, the process is carried out in an additional carbon-producing atmosphere, whereby two layers ensure high wear resistance and corrosion protection. Our VT-N-OX® process provides additional corrosion protection through subsequent oxidation.
Sustainability factor:
Compared to other hardening processes, the process operates at significantly lower temperatures, with noticeably reduced energy requirements. The absence of quenching in oil also makes nitriding a more environmentally friendly process.
In this process, the application is hardened under vacuum in combination with a fully integrated oil quenching system. The process is suitable for all classic case hardening steels (e.g. 16MnCr5 or 18CrNiMo7-6). The furnaces can achieve carburizing temperatures of up to 1,050 °C. Thanks to oil quenching, this technology can also harden all hardened and tempered steels, ball bearing steels and tool steels without oxidation.
Sustainability factor:
The process meets the most stringent requirements in terms of occupational and environmental protection. The process has no direct emissions and can be operated on renewable energies.
Very high flexibility, uniformity and reproducibility: multi-purpose chamber furnaces offer numerous advantages and are used in a variety of ways in heat treatment. The components are first treated under a controlled protective gas atmosphere and then quenched with different quenching oils in the integrated oil bath. In our furnaces, we cover the entire spectrum – from annealing, hardening, tempering, carburizing and case hardening to carbonitriding.
Sustainability factor:
Thanks to state-of-the-art heating and burner technology, we ensure good energy efficiency throughout the entire process.
Induction hardening is one of the methods used for surface hardening: the component is heated locally up to austenitization temperature by means of electromagnetic induction and then quenched until the required hardness structure is formed. Even complex-shaped workpieces can be partially hardened without changing the rest of the component. In addition, we offer the expertise for the respective inductor and develop and build this tool for inductive heating in-house.
Sustainability factor:
In induction hardening, the required energy is used partially, i.e. it is only used at the points where the component is hardened. This saves energy. The process is also fully electric, which allows renewable energies to be utilised.
Even if unwanted dimensional changes are reduced to a minimum, distortion-free heat treatment is often not feasible for technical reasons. In many cases, distortions following heat treatment can be corrected with the straightening benches available to us and our qualified personnel.
Depending on the customer’s requirements, after many heat treatments, an improvement of the surface may be desired. For this purpose, we have a wide variety of blasting systems at our locations. This gives them a clean, uniform, matte, metallic surface.
Lapping is a cleaning blasting with a much milder blasting medium. The process is carried out by hand, with gentle cleaning of sharp edges and threads. This also gives them a clean, uniform, matte, metallic surface.
The cleaning of components before and after heat treatment is now an integral part of heat treatment processes.
VTN works exclusively with state-of-the-art cleaning systems. Both aqueous alkaline cleaners and isoparaffinic hydrocarbon mixtures are used
Our well-equipped laboratories carry out the complete spectrum of materials testing at our sites. Hardness measurements, material analyses and grinding assessments ensure measurable quality.
Take advantage of our many years of experience and extensive knowledge in heat treatment and benefit from our expertise. Optimise your products by using suitable materials or by applying heat treatment tailored to your product.