Abstract
Effects of contact angle and groove factor of a heavy load ball-screw are discussed with the variation of contact forces at eight ball circulations. Contact forces are varying as a sinusoidal function of each circulation owing to the variation of phase angle. With the increase of contact angles, contact forces at each ball circulation are decreased and variation in each ball circulation. The decrease of the contact forces means that the contact stresses of contact areas are reduced. Fatigue life of raceways can thus be extended. Low groove factor can reduce skidding speed and friction coefficient. By the analyzing results, optimal transmission performance can be achieved in a heavy-loaded ball-screw.
Highlights
Heavy load ball-screw is wieldy used in plastic injecting mold machine, applying in injecting and load-lock axes
The black line separates right and left nuts, contact forces at the left nut are much lower than the right nut
Contact forces are varying as a sinusoidal curve due to the effect of the phase angle of each ball is different
Summary
Heavy load ball-screw is wieldy used in plastic injecting mold machine, applying in injecting and load-lock axes. Operating conditions are low rotational speed and extremely high axial load, contact pressure on a contact area of ball-raceway can reach 1.8 GPa. contact forces on each circulation of balls will not be equal owing to the contact mechanism. Contact forces on each circulation of balls will not be equal owing to the contact mechanism This will lead to serious wear occurred at the ball circulation which is nearby the flange of nut. The aim of the study is established a kinematic simulation model of multi-cycles ball-screw without preload in order to estimate contact forces on each circulation. This can help in the heavy loaded ball-screw design on uniform contact forces. An axial load is applied to a side of the flange of the nut
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