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Burak Berk ARINCI, Hatice SANDALLI YILDIZ, Umut İNCE, Muhammed Burak TOPARLI, Niyazi Emrah KILINÇDEMİR, Sarper DOĞAN
INVESTIGATION OF THREADING PERFORMANCE OF SELF-THREADING NUTS ON MACHINED AND CASTED ALUMINUM PARTS
 
Due to changing industry needs and increasing costs, reduced process steps and assembly time are essential. Self-threading nuts are the products that develops for this purpose. A standard nut is threaded into a round hole, then assembled with a counterpart threaded with a tapping, and assembled at the relevant location. The threading processes of the two parts are carried out separately, causing input costs and loss of time. Self-threading nuts are used in assemblies by creating thread on counterpart with the thread structure they have. Thanks to this feature, they eliminate the need for tapping threads separately, making the installation process faster and more straightforward. In this study, the threading performance of four lobular, patent pending, self-threading nuts were investigated. The nuts were manufactured with cold forging and threads were formed with tapping. Heat treatment was applied to obtain required mechanical properties. Counterpart to be threaded was selected as aluminum with a hardness of 110 HV. Two sets of counterparts were manufactured. The first group was manufactured with machining, while the second group was manufactured with casting. These two groups were further divided into two in terms of taper angle. Based on the experimental results, it was revealed the quality of formed threads was directly correlated with porosity level of the casted aluminum counterparts. It was seen that machined counterparts were able to withstand higher torque than casted parts. Furthermore, in terms of thread quality and threading performance, the diameter of the counterpart was found to be another critical factor. ORCID NO: 0000-0003-2286-3117, 0000-0002-5550-8480, 0000-0002-3118-3060, 000-0002-5203-5171, 0000-0003-4928-158X, 0000-0003-0701-9313

Anahtar Kelimeler: Cold Forging, Thread Forming, Self-threading Nut



 


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