Examples of using Pre-load force in English and their translations into German
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Improved constancy of the pre-load force.
Table Values for pre-load force and tightening torque.
Application of a defined pre-load force.
The pre-load force is difficult to measure during mass-productions.
DEPRAG friction value procedure ensures constant pre-load force.
For this purpose, no high pre-load forces are needed, which is why pressure ratchet lashings are the most economical here.
The prevail torque reveals the seating conditions and their effect on the pre-load force.
If the lashing straps are used for lashing down, the pre-load force(STF) of the lashing strap is decisive.
The goal of an assembly is generally the connection of two ormore parts to a defined pre-load force.
This results in a considerable improvement in constancy of pre-load force in comparison to purely torque guided tightening procedures.
The most important application case in thescrewdriving assembly is the determination of a defined pre-load force.
This value can be calculated from the required pre-load force and is then used as value to determine correct screw assembly.
A difference torque(or difference angle) inferred from the seatingpoint allows a significantly improved constancy of the pre-load force.
The lack of practical methods of measuring this pre-load force means that you are usually reliant on the torque as an aiding measurement in series assembly.
This reliable,adaptive screwdriving procedure provides excellent constancy in the pre-load force even with fluctuating torque.
The pre-load force resulting from the tightening torque is significantly influenced by the fluctuating coefficient of friction as well as the screwdriving device's torque spread.
The most common problems are settling conditions of a joint andother assembly related fluctuations of the achieved pre-load force.
The use of a torque controlled tighteningprocedure can cause fluctuations in the resulting pre-load force even if shut-off accuracy is as precise as possible.
The actual required force for connection of these two or more components to ensure a reliable andsafe connection is the pre-load force.
Even if the tightening torque has been designed so that the required pre-load force is attained, it will gradually be lost due to the“seating” of the silicone.
Using a torque controlled tightening procedure, even if there is the highest shut-off accuracy,can lead to large fluctuations in the resulting pre-load force.
Goal of the screwdriving task iseither the application of a defined holding strength pre-load force or the execution of certain adjustment- or dismantling processes.
It is the frequently unknown seating conditions of the screw connection which can be particularly problematic,as well as any assembly-related fluctuations of the pre-load force.
As a result, the accuracy of the appliedtorque is in direct combination with the achieved pre-load force and the associated quality of the assembly.
This pre-load force results from the application of a manual force(SHF) of 50 daN(which corresponds to about 50 kg) on the ratchet lever and is thus dependent on the lever length and the ratio of the ratchet.
This means that the screw connection always needs to be so over-dimensioned that it is not overtightened if a deviation in the upper range occurs andthat the required pre-load force is still applied in the case of a lower deviation.
In lashing ratchets,we distinguish between long-lever ratchets for achieving high pre-load forces during lashing and pressure ratcheting, which can be used both for lashing down and for positive locking, but which do not achieve such high pre-load forces.