Arbetsmiljövänliga låsvätskor i stötdämpare
Thread lockingCylindrical lockingAnaerobic thread lockerHealthSuspensionGänglåsningCylindrisk låsningLåsvätskaArbetsmiljöStötdämpare
This master thesis is a study of anaerobic thread lockers and is done in cooperation withÖhlins Racing AB, which is a Swedish manufacturer of vehicle suspensions.The suspension in vehicles is constantly exposed to high vibration levels and a suspensionunit has several screw- and cylindrical joints. As an extra safety precaution so that thecomponents in the suspension doesn?t fall apart when using the vehicle, an anaerobicthreadlocker is added in these joints. The handling of these threadlockers is not totallyharmless and could lead to allergic reactions, and therefore there are Swedish laws to limit theuse of these. However, new types of anaerobic threadlockers have recently been launched onthe marked that are not considered under this law. The goal of this thesis is to investigate if itwould be possible to change from the today used threadlockers to these new types. A big partof this task has been based on tests of screw- and cylindrical joints. Different materialcombinations of aluminum, anodized aluminum and steel have been tested, as well asparameters such as elevated temperature. The breakloose torque for the thread joints, and theforce required to axially break a cylindrical fitting has been analyzed.Tests were performed with both medium- and high-strength anaerobic threadlockers ofdifferent brands. The results from the screw joint tests with a medium strength threadlockershow that the new health-friendly threadlockers are about as good as the ones used today,except at high temperatures. Considering the high strength threadlockers in aluminum screwjoints, the reference threadlocker showed about 10 ? 30 % higher breakloose torque than thehealth-friendly one, depending on the different material combinations. With the steel ?aluminum screw joints, the breakloose torque reduced to about half of the aluminum ?aluminum breakloose torque values for both types of threadlockers. The results also show thata thicker layer of anodized aluminum gave a higher breakloose torque and that temperaturesof about 85 oC lower the strength with 22 ? 29 % compared to the tests in room temperature.In the case with the cylindrical joints, the health friendly ones were weaker than the one usedtoday, but it might still be possible to use them in some products.The conclusions of this thesis are that the health-friendly threadlockers in general are a bitweaker than the ones used today, and that anodized aluminum gives a higher breakloosetorque than both aluminum and steel. It is likely that a change from the threadlockers usedtoday to the new health-friendly ones could be possible in at least some joints. Although moretests have to be done with dynamic loads and oil resistance for example.