Abstract
ABSTRACT This study investigated the effects of pilot-hole diameter in medium density fiberboard (MDF) on the characterization of screw-driving torques. The factors investigated were the embedded screw orientation and pilot hole diameter. Based on the curves obtained from screw-driving process, the measurements of the seating torque (SET) and stripping torque (STT) were obtained. The results of statistical analysis indicated that the SET and STT values in MDF were significantly affected by the pilot hole diameter. In the case of driving screws into the side of MDF material, the mean SET ranged from 0.37 to 1.23 N∙m and STT values ranged from 1.18 to 2.68 N∙m whereas for the face specimens, the mean SET ranged from 0.57 to 1.56 N∙m and STT values ranged from 2.89 to 5.41 N∙m.
Highlights
Seating problems in screws arise when screws are insufficiently tightened into a material due to lack of sufficient value of torque
This screw-driving process were divided into three stages, namely, the thread-forming stage, where the torque was increased at an increasing rate as the screw formed threads without cutting the material, reaching the maximum drive torque (MDT) and seating torque (SET)
Screw-driving torques in medium density fiberboard (MDF) were investigated by evaluating the effects of different factors, such as the pilot hole diameter and embedded screw orientation
Summary
Seating problems in screws arise when screws are insufficiently tightened into a material due to lack of sufficient value of torque. The torque requirements for particular applications should be determined and the appropriate torque should be applied to induce the clamping force essential for the realization of a reliable screw-fastened assembly (Tor et al, 2016). To this end, it is important to determine the minimum and maximum screw-driving torques in materials such as the wood-based composites that are used for structural and nonstructural applications. Knowledge of screw performance based on the screw-driving torque required for assemblies made with MDF is important for its correct use
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