Abstract
Stick-slip phenomenon in some mechanical structures, especially in machine tools, should be eliminated or inhibited, otherwise the vibration will occur and the position error will inevitably be obtained. In this study, different kinds of surface textures were carried out on the lower samples of the pin-on-disk contact. The starting process of the machine tools was simulated on an Rtec-Multi-Function Tribometer. The stick-slip phenomenon was observed in each kind of samples. However, the stick-slip phenomenon of smooth sample is larger than that of the textured samples. The bulge-textured surface shows excellent anti-stick-slip effect, and the critical stick-slip speed of bulge-textured surface is 95.9% lower than that of the smooth surface. Simultaneously, the anti-stick-slip effect of bulge-textured surface is superior to that of the dent-shaped texturing surface. What’s more, when the amount of lubricating oil is 15 mL, the standard deviation values of friction coefficient and critical speed of stick-slip phenomena (rotational speed when the standard deviation of friction coefficient is abrupt) are the lowest at different rotational speeds. It can be predicted that the bulge textures and adequate amount of lubricating oil (15 mL) can eliminate stick-slip phenomenon when processed in the surface of the machine tool because the bulge textures and adequate amount of lubricating oil can improve frictional state effectively and avoid the slip of the contact surface.
Highlights
Under some circumstances, especially at low speed and heavy load, a sliding motion between two contact surfaces does not always generate constant friction force, but the motion changes between adhesion and sliding periodically.[1]
The stick-slip phenomenon usually occurs at the beginning of starting process because of the difference between the kinetic and static friction coefficients
What’s more, it can be seen from Figure 3(b) that before rotational speed reaches the critical value, the friction coefficient changes periodically and constantly from a larger value to a smaller one, that is because the motion alternates periodically between adhesion and sliding during stick-slip process.[1]
Summary
Especially at low speed and heavy load, a sliding motion between two contact surfaces does not always generate constant friction force, but the motion changes between adhesion and sliding periodically.[1]. The anti-stick-slip mechanism of dent-shaped texturing surface is different from that of the bulge-textured surfaces because the dimples or grooves morphologies have the capability to reserve lubricating oil, and the lubricating film thickness will increase.
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