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The most common assembly technique is screwing and bolting.
Screwing is no longer done manually, but has been replaced by the use of electric or pneumatic screwdrivers. Such tools involve a very high clamping force which can lead to the phenomenon of seizing.
Stainless steel screwed connections are regulated by standard NFE 25-035.
The surface condition of the material is usually a decisive factor in the onset of binge eating. In the case of stainless steel, however, other parameters also play a role.
When tightening a bolt on a nut, only 10% of the torque actually contributes to the tightening (axial force), the rest is lost in friction on the thread and under the head of the bolt (tangential force).
Friction is needed to keep it from loosening over time. However, if it gets too big, seizing occurs, which results from micro-adhesion, e.g. B. arise between the threads: It is impossible to loosen the nut and the screw may break under load. Solutions must therefore be found to avoid increased friction.
The measurement makes it possible to determine the torque from which there is a risk of seizure: The coefficient of friction must be constant, it indicates from a certain value
of torque, a significant increase in the coefficient of friction indicates seizure.
In order to increase the seizure threshold, it is necessary to act on the friction coefficient thread/thread and washer/nut (source: Institute for the development of stainless steel).
NFE 25-035 recommends subjecting screws or nuts, generally the latter, to a mechanical, chemical, thermochemical or other treatment. This standard also indicates that in torque-tension tests, the recommended speed must be between 10 and 25 rpm and that it must be continuous and regular.
One B January 2012 a Fasteners-Service the Decision encounter, HU- And
Provide brake nuts with lubricated "WAX" coating to reduce seizing.
Second solution → PRECOATING
(Alternative with "WAX", a more reliable but more expensive solution)
THE SEIZURE PROTECTION FUNCTION
The phenomenon of the Festfressens kicking In
different situations:
Seizure on screwing when installing a threaded part
Contact corrosion (welding) under vibratory stress
Contact rust in harsh environment
To avoid seizing when screwing, we apply a lubricating varnish on the thread to reduce the coefficient of friction.
To increase the anti-seize function during operation
reach, we use dry lubrication which avoids seizing at high temperatures up to 700°C and under high pressure. The pre-coating allows controlled screwing (lower
coefficient of friction) And and simple
Take apart.
ADVANTAGES
Eliminates seizing of screws.
Allows high screwing speeds when connecting stainless steel screws / stainless steel nuts.
Controlled protection zone without excess product in the cavities.
Especially useful for sensor sockets and electronic components.
Allows easy disassembly after intensive use: high temperature, high pressure, chemical environment, vibration. .
Control of technical parameters.
Particularly qualitative solution because integrated into the room.
Reduction of assembly costs in the workshop and on site.
PROPERTIES AND PRODUCTS
The pre-lacquering products that we deposit are the result of our long-standing partnerships with the largest manufacturers.
