INVESTIGATION OF LOOSENING RESISTANCE UNDER ASSEMBLY CONDITIONS USING DIFFERENT LOCKING CHEMICALS AND LOCK NUTS

Authors : Baybars Sarıca, Tolga Aydın, Samed Enser, Umut İnce

Pages : 26-31

View : 48 | Download : 44

Publication Date : 2024-06-30

Article Type : Research

Abstract :Abstract Fasteners are subjected to repetitive and variable loads in the areas where they are used. This situation creates some risks such as loosening or fracture of fasteners, result the failure of the joint. Locking chemicals applied on the bolt to prevent loosening that may occur under assembly conditions are used extensively, especially in the automotive industry. By using locking chemicals selected in accordance with the assembly area and fastener, it is aimed to prevent the loosening of the assembly parts under vibration. There are commercial products that offer different properties that can be used in the mass production of locking chemicals. Within the scope of the study, the performance of three different commercial locking chemicals against loosening was investigated and used standard M8 bolts and nuts. In addition, the M8 DIN 980 lock nut, which is used in joints that are at risk of loosening in vibrating areas, was also added to the studies. Due to the effect of the coefficient of friction on the clamping load, all fasteners were coated with the same coating to ensure equivalence in installation conditions. The vibration performances of the locking chemicals were investigated with the Junker vibration test. The results were analyzed comparatively and the joint condition with the highest vibration resistance was determined. As a result, it was observed that the use of locking chemicals and lock nuts increased the loosening resistance.
Keywords : Bolt, Lock nut, Locking Chemical, Assembly, Junker vibration test