| Summary: | 碩士 === 國立中山大學 === 機械工程學系 === 87 === The tribology behavior on the contact surfaces of screw and nut in the processes of tightening and releasing under
the dry and six different lubricants were investigated by using a new tribological tester for screw and nut set. The
materials of screw and nut are SCM 440 and HBsC3 respectively.
In the dry condition, with the increasing of tightening-releasing cycles, the friction coefficient of the screw surfaces increases rapidly and the clamping force decreases rapidly. Moreover, the adhesive wear particles on the screw were observed. The screw and nut set can not be used to keep a stable clamping force.
Under the lubricants of 810, 805K, NyeCorr140, and GM+GS, with the increasing of tightening-releasing cycles, the friction coefficients increase and the clamping force decrease. Under the lubricants of PASTE MZ and Longterm 2 Plus,
the friction coefficients keep low value of 0.1 and the clamping forces keep stable. So that the lubricants of PASTE MZ and Longterm 2 Plus, with the additive of MoS2, can provide a long life of screw and nut set.
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