Machinery Lubrication


Machinery Lubrication magazine published by Noria Corporation

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28 | September - October 2020 | www . What is Adhesive Wear One of the primary concerns with machinery lubrication is wear generation. Understanding this process, why it occurs, its presence and development, how to detect and analyze it, and what prevention measures need to take place to avert it can greatly improve site equipment reliability and work to minimize associated downtime resulting in a more profitable and enjoyable workplace. Let's take a closer look at adhesive wear and discuss the noted param- eters mentioned above. While there are many types of wear generation within lubrication, we will be specifically reviewing adhesive wear. Adhesive wear is the result of the transference of material from one surface to another, typically taking place in poorly lubricated sliding applications. As we look further into adhesive wear, it will become apparent that there are several alternative names often associated with this type of wear. As such during discus- sion or analysis one may encounter terminology such as scuffing, seizing, cracking, smearing, and galling and must bear in mind that all of these can and must all fall within the realm of adhesion. Adhesive Wear Sources During inadequate sliding lubrication, asperities, or surface peaks, are subject to interaction with one another. As this transpires, strong adhesive interface can result in "cold welding" and the potential for coarser surfaces and wear generation are intensified by means of fragment material transfer. It is important to know that there are two fundamental elements that endorse adhesive wear: 1) the proclivity of dissimilar types of materials to form solids or compounds once contact occurs and 2) the overall cleanliness of the surfaces that interact with one another. With this being said, there are several other influencing factors that should be considered. e addi- tive package and film thickness of the lubricant, the size of components that make up the asset, and certain specific operating parameters such as load and speed should also be considered. As adhesive wear begins to occur it often forms into two types of wear. At very high loads, the debris is often oxides, but at lower loads it is metallic. e oxidation process occurs as the wear and protection films begin to wear away and the metallic process commences directly afterward. It is during the transition from oxidative to metallic wear that there is often an immediate increase in the rate of wear. e severity of adhesive wear generated during this process is directly proportional to the load applied and the distance covered during contact over this time. Now that we have a better understanding of how adhesive wear occurs, we can begin to look at what causes Adhesive Wear Explained Adhesive wear is the result of the transference of material from one surface to another typically taking place in poorly lubricated, sliding applications." " M achin e Insp e c tions PERSPECTIVE Matt Adams | Noria Corporation

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