Mechanism of adhesive wear on the surface of taper sleeves – Jiri Chemicals

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By examining the mechanical behavior and actual forms of damage in the operating condition of oil film bearings, it can be seen that sliding friction occurs between the contact surfaces of the cone sleeve and the roller neck during installation and removal, and this process repeats itself. As the interference amount increases, the contact pressure rises, resulting in high-stress areas in certain regions. The above mechanical behavior inevitably leads to adhesive wear of the surface damage on the cone sleeve and roll neck. As required by the manufacturing process, the contact surface between the cone sleeve and the roll neck must have a high level of precision in its machining, but on a microscopic scale, its surface cannot be completely smooth; there is always a certain degree of roughness. When the cone sleeve is pushed into the roll neck, as the amount of interference increases, the contact stress between the contacting surfaces also increases. In particular, very high contact stress levels are observed on both sides of the sealing grooves at the ends of the cone sleeve, along with corresponding friction forces τ. However, since the actual effective contact area A between the cone sleeve and the roll neck is much smaller than the ideally calculated geometric contact area A, resulting in microscopic local contact on the finite micro-protrusions, an effective local contact stress σ that is far greater than the calculated stress is generated on the effective contact surface. This leads to plastic deformation of the contact surface, thereby breaking the expanded oil film and oxide film on it, allowing the metal surfaces of the cone sleeve and the roll neck to come into direct contact and causing adhesion (cold welding). Under the action of assembly thrust, the relative movement between the contact surfaces causes the adhesive points to be sheared off. A cycle of sticking and cutting, repeated over and over again, occurs, resulting in scratches on the contact surface between the cone sleeve and the roll neck. Moreover, the cone sleeve operates under its own specific stress field, which leads to the formation of surface microcracks. In Jiri Chemical, when the mechanical properties of the cone sleeve and the roll neck are not significantly different, this type of wear is the most common; moreover, the factors that contribute to it are quite complex. Therefore, it is necessary to identify the main factors responsible for adhesive wear in the cone sleeve. In addition to the inevitable factors related to its mode of operation, a specific stress field distribution exacerbates the degree of adhesive wear between the cone sleeve and the roll neck. To this end, it is necessary to conduct an in-depth analysis of the causal relationship between stress conditions and surface wear in order to find ways to reduce surface damage. Wuhan Jiri Chemical has been specializing in chemicals for steel surface pretreatment for 21 years. Green and environmentally friendly, cost reduction and efficiency improvement, energy conservation and emission reduction. Feel free to ask! For any metal surface, different surface treatment methods can be applied to give it certain topographical (surface roughness) characteristics. Under certain conditions, these surfaces experience wear; although this leads to changes in their surface morphology, they still retain certain specific topographical characteristics. It is difficult to objectively describe these special stress conditions on the surface using traditional evaluation parameters, and there must be a specific inherent relationship between such conditions and the form of wear that occurs. Therefore, it is necessary to uncover more information hidden in surface wear in order to obtain systematic results.