Align
Precise shape correction of components
Straightening is a process used to correct dimensional and geometric deviations in metal components that have arisen as a result of manufacturing processes, heat treatment, or mechanical machining. Depending on the material, geometry, and requirements, different straightening methods are used, particularly flame straightening and notch straightening.
Flame straightening
In flame straightening, heat is applied specifically to the raised or warped areas of the component. The temperature at these hot spots typically ranges between 400 and600°C. The localized heating and subsequent cooling create superimposed tensile stresses that pull the component into the desired shape in a controlled manner.
The heat input can cause a local reduction in material hardness. Flame straightening is particularly suitable for larger components and structures where mechanical straightening alone is not sufficient.
Notch straightening
In contrast, notch straightening is performed at room temperature. In this process, compressive residual stresses are specifically introduced into the component surface by cutting notches, which have a shape-correcting effect. This method is primarily used when thermal effects on the component must be avoided.
Thermal stress relief after straightening
Regardless of the straightening method used, the components are thenstress-relieved at a temperature of approximately200°C. This step serves to reduce any new stresses that have developed and to ensure the component’s long-term dimensional stability.
Straightening is an important intermediate step in the manufacturing process that ensures components can be reliably processed or used within specified tolerances.
We look forward to hearing from you!
Please use our contact form or contact our sales team directly.
Silvio Stranek
Sales, Technical Consulting / Quotes (Upper Austria, Tyrol, Salzburg, Vorarlberg, Bavaria, South Tyrol)
Email. s.stranek@htr.at
Phone: +43 (0) 664 / 88 92 78 10
Thomas Stadlober
Sales, Technical Consulting / Quotes (Styria, Vienna, Lower Austria, Carinthia, Slovenia)
Email. t.stadlober@htr.at
Phone: +43 (0) 664 / 88 64 15 06
OTHER PROCEDURES
Other special procedures
Back to the overview of hardening processes
OUR INDUSTRIES
Automotive industry
Aerospace
Medical technology
Tool and Machine Manufacturing
Your Questions, Answered
We have compiled a list of frequently asked questions to help you better understand our services.
When is judging necessary?
Straightening is used when components exhibit dimensional or geometric deviations that fall outside the permissible tolerances following welding, heat treatment, or machining.
What is the difference between flame straightening and notch straightening?
In flame straightening, the shape is corrected by applying heat to specific areas and then allowing the material to cool. In notch straightening, on the other hand, compressive residual stresses are intentionally introduced at room temperature to bring the component into shape.
Does flame straightening alter the material properties?
Localized heat input may result in a slight reduction in hardness in the heated areas. For this reason, the process is carried out under controlled conditions and is often combined with subsequent thermal stress relief.
Why is thermal stress relief necessary after straightening?
Thermal stress relief reduces residual stresses generated during the straightening process and ensures that the component retains a stable, permanent shape.
For which components is straightening typically used?
Straightening is frequently used for welded structures, large components, and parts that require a high degree of dimensional and geometric accuracy.
Can straightening be combined with other heat treatment processes?
Yes, straightening can be effectively integrated into existing heat treatment processes to ensure that components are processed efficiently and reliably within the required tolerances.