As a result of washer rotation at the moment of mounting, torque coefficient changes. This leads to uncontrollable scatter of pre-tightening force, and thus, to disturbing reliability of the connection.
Use of the friction coating on a washer is high-tech and extremely effective solution that came out of precision engineering. It completely solves the issue of washer rotation relative to a substrate by changing physics of interacting within the unit.
The washer surface treated with the friction coating has increased and stable friction coefficient. At mounting a bolt set, the coating reliably holds the washer fixed on its place relative to the metal structure: so, at tightening, the washer remains stationary while the bolt head is turning relative to it because contact area between the washer and the substrate is much larger than one between the washer and the bolt head or the nut. Due to this, torque coefficient remains stable (it is calculated taking into account application of the friction coating, and other features of the threaded connections), and pre-tightening force remains predictable and controllable.
Such approach is especially helpful where it is not desirable to make the structure more complex with additional mechanical lock members since the coating requires no changing the fastening unit geometry. As a result, this solution can be implemented into existing range of the fastening items and the operating procedures of production.
The elastic friction layer is able to adapt to a mating surface, to distribute contact loads better, and to retain its functionality at reassembly.
So, this friction coating does not change the basic connection scheme but gives one of its parts new functional characteristics. At the same time, the connection remains demountable, that is why this solution is particularly favorable when the fastener need to be dismantled and remounted from time to time.
MODENGY 1031: brief description
MODENGY 1031 belong to the functional friction coatings that are used to provide high values, and stable friction coefficient in metal-to-metal pairs at transmitting torque, locking, and braking.
The basic advantages and performances of the coating are:
- Service temperatures range: -100…+230 °C
- High elasticity and adaptation to the mating surface
- Remaining its properties at multiple cycles of mounting and dismantling which especially important to maintain the units where repeatable disassembly and reassembly are required
- Anti-corrosive properties, and excellent adhesion
- Color: blue. This enables to make identification of the coating easier if necessary
- Polymerization at +150 °C within 40 minutes, or at +200 °C within 30 minutes
- It enables to reinforce fixation without changing structure of the threaded unit
For industrial implementation, not only performances of the coating are important but also possibility to adapt the technology of applying the coating for various production processes. It is allowed to apply MODENGY 1031 by the method of spraying out or by dipping with centrifuging. The former method is convenient for the parts of complex shape, and test batches.
The latter method – by dipping with centrifuging – is of particular interest for batch processing of washers. The whole part is covered with the coating what ensures uniform friction layer all over the contact surface. This highly productive method enables to apply the coating on a large number of items in bulk for a short while, getting a uniform layer.
The application fields of this friction material also extend to preventing washers from rotating at tightening high-strength fasteners in construction metal structures, to locking of threaded connections, to transmitting torque in shaft-bushing connections, and to working surfaces of the friction couplings.
Conclusion
Under conditions where quality of bolt sets tightening is critical for reliability of the structure, MODENGY 1031 friction coating enables to exclude washer rotation at mounting, to ensure stable torque coefficient and predictable tightening force without fundamental complicating the structure. This coating retains possibility to disassemble the unit, it can be applied by the habitual industrial methods including dipping with centrifuging, and combines friction function with elasticity, adaptation to the mating surface, and corrosion protection.
For more details and professional selecting the functional coatings for certain operational conditions, please, contact the Modengy company.
You can
Purchase the coatings and then apply them by yourselves. We will provide you with the detailed instruction
Order your set
for self-applying
Order the service on applying
