Flame straightening with treatment according to the WIAP® MEMV® 2016 process.
(MEMV® = Metal relax with vibration)
P1: Stable related MEMV® pathogens the component
Description of the flame straightening - process
This method is used for straightening deformed components,
correcting the delay of welding constructions and for directing
and profiles large-area parts.
Also thin sheets like box structures, machine beds, machine
stand are typical tasks for flame straightening.
A portion of the metal is determined by the acetylene limited
oxygen flame locally heated. It occurs as a result of disabled
thermal expansion, a permanent squeezing. That is, it has
between the zones of the discolored area and the uncolored
area a different voltage than the focus of discoloration. Thus,
desired forms again getting produced.
In addition, flame straightening can to molding are used.
P2: The component was directed flame
It can, for example when welding a incurred angular distortion
are addressed, a slight bend be achieved by plates bending profiles
strong, crooked steel plates or warped frame correct and even
the diameter of cylinders decrease. (What safe only as a stopgap
P3: Flame straightening point
When machining general structural steels, fine grain and austenitic
toughen with a carbon content of more than 0.05% should be a
oxidizing flame be used.
The temperature of 650°C (red heat) should be in this case not
For aluminum and aluminum alloys should the temperature no
higher than 350°C to 400°C and is dependent on material and
alloy. In this connection should be a neutral flame with light
P4: The component having a plurality of heating bodies by flame straightening.
Advantages of flame straightening - process.
1. Unrivaled efficiency and effectiveness the oxy-acetylene flame
2. Faster and material gentle removal the workpiece delay
3. Clearing of welded delays instead scrapping
4. For all metallic, weldable materials suitable
(High-strength steels only suitable)
5. DVS - certified procedure for approval DIN EN 1090
6. High mobility. (Use without power supply possible)
However, flame straightening causes a new problem: namely
the delay in processing. Annealing after flame straightening result,
that the component in the original warped position moves back.
After this new WIAP® MEMV® Method, there is no delay to
the processing. That is the WIAP® MEMV® Relax eliminated
in the intermediate zones, where it passes through the flame
straightening was red hot and the uncolored zone where a
compression took place, tensions. This, stresses generated by
heat are, distributed by the vibration margins so that between
the cold compression zones which by flame straightening not
revealed to the WIAP® MEMV® distributed process and thus
prevents a delay in the processing.
P5: The component loses scale by WIAP ®MEMV® process
P6: The measuring probe records the process
P7: Very important is a good rubber underlay. This should have a
sufficient height so that no vibrations are transmitted in a factory
building. In addition, the logging is accurate.
P8: Machine stand during relaxation process. This was also
P9: The WIAP® MEMV® method solves many problems
P10: Even the heavy machinery sword in détente
P11: About 20 tons of the workpiece weight. The WIAP AG has
facilities for 5, 20, 50, 100 and 200 tonnes
An alternative to the tension arm glow. Thanks to the new improved
methods WIAP® MEMV®
(Metal relax with vibration)
If we take a hot-rolled construction, which is warped by torsion and straightness
in several mm, this flame judge, then bring in the annealing plant, the work comes
after annealing, by the influence of heat, back into the warped base position.
With the WIAP® MEMV® Method, the flame directed workpiece vibrates.
The axis-specified eccentric stages setting allows the excitation process can
also take place with a maximum speed without too extreme deflection occurs.
All axes are touched. With 24 measuring points the exact course and the changes
are determined and recorded. When following machining the workpiece is
not slow. That is, the vibration can relax now with the MEMV® relaxation method,
advantages over the glow, because balance the tensions.
The merit of MEMV® WIAP® procedure summarized:
This new and improved WIAP® MEMV® method is the key to why the metal relax with vibration has an advantage compared to the annealing.
It is also important to know that it has been stated that the vibrational relaxation
locally to zones, not only heat, but also with vibrations, stresses degrades specifically
controlled so that no reset delay a directional component takes place.
However, it is very important to carry out a 100% controlled vibration relaxation.
It takes a very good attachment between the component and the pathogen. The
introduction of energy direction plays an important role. The in one component
always present dead centers must resp determined are always well attended.
The following protocol shows the current measurement in the process according WIAP® MEMV®.
It is a component today considering 24 measuring points, so that the change
between before and after in many places is determined. The difference we
measured after about 90 seconds. The biggest stress relief is, however, at the
very first load cycles. This we collect but not currently. The advanced detection
method is with us in preparation.
Where tensions go towards the MEMV® process?
The not relax with heat but vibration?
regarding the question where to go toward the tension, I would like to answer
Flame-looking components generated by the introduction of a local thermal stress
state of communicating with the environment in balance.
If this component is annealed arises through a free deformation, a new state of
tension and the component is crooked. Was the case of a flame-directed component
which are overlaid by local equilibrium states that the macroscopic equilibrium states straightened, these local equilibrium states are disturbed by the processing and the
component passes through a deformation in a new state of equilibrium.
If the component is annealed in a clamped state and cooled clamped slow the global
tensions in balance and subsequent processing will not have a major influence on the straightness.
When vibrate in the clamped state in several directions, the stresses in the global state
are brought into balance, and the component can be edited. The voltages are not only
on the surface but also in a greater depth in equilibrium.
I hope to have explained to you with this short version, where the tension go.
Created: Iris, Sven and HP Widmer
Answer where tensions go towards the MEMV® method
response from Prof. Schmid