3D Finite Element Modeling of an Assembly Process With Thread Forming Screw

Abstract

This paper presents a 3D finite element (FE) model of a thread forming screw assembly process based on the ABAQUS 6.5.4 Explicit software program. The model consists of two principal elements: an M10×12 thread forming screw and a lower 4 mm plate into which the screw taps its threads. The aim was to develop a robust industrial dimensioning tool; the model can be extended to establish the preload and investigate other types of assemblies. A 45 deg sector, which represents 1/8 of the joint, was modeled to maintain a good compromise between calculation time and an accurate representation of the thread forming process. The intent of the study was to analyze the material flow throughout the thread forming process; a parametrical study was also conducted to identify the most influential process parameters. To validate the model, FE numerical simulation results are compared with published experimental results. The study shows that the lead hole diameter has an important influence on the screwing torque.

Analytical study of maximal tapping torque during forming screw process

“…So, the higher the friction factor, the greater the calculated forming torques. These results confirm those carried out by finite element simulations and recall the distribution of dissipated energies during the forming process simulation obtained by Mathurin et al (2009).…”

“…Recently, Warrington et al (2005) used an indentation process based on an experimental study on tapping to study the shape of the hole at the crest of the threads. Mathurin et al (2009) developed a 3D FE model to analyze the material flow throughout the thread forming process and to identify the most influential process parameters by a parametrical study. In order to develop a better understanding of the tightening process, it is necessary to evaluate the forming torque and the maximum tapping torque.…”

Dynamic modeling and simulation of the screwing behavior of thread forming screws

“…The influence of the lead hole diameter has been shown also with numerical simulations by Mathurin et al [3]. They show that the lead hole diameter affects the shape of the threads and subsequently the thread torque due to forming T t forming .…”

“…Guan et al [2] studies the stress distribution during a dynamic simulation of the dental implant insertion process. Mathurin et al [3] determine displacements during the forming process and the shape of the threads with a 3D finite element model from a 45 degree sector (discrete rigid screw body). They also conducted a parametrical study to identify the most influential process parameter.…”

Does screw–bone interface modelling matter in finite element analyses?

“…This approximation simplifies the analysis by making it linear. Several studies have used a frictional interface while ignoring screw threads (Alonso-Vazquez et al, 2004;Fouad, 2010;Izaham and Kadir, 2010;Kim et al, 2010;Mathurin et al, 2009), while some others incorporate screw threads (Gefen, 2002;Karunratanakul et al, 2010). Coefficients of friction used vary widely from 0.1 to 0.9 with the larger values used to simulate screw-bone interaction in models without threads.…”