Abstract
In this paper, the gear material 20CrMnTi was selected as the research object. Friction and wear behavior was performed on the M2000 friction and abrasion tester. The friction and wear mechanisms of 20CrMnTi steel were discussed under coupling of rolling and sliding. The results show that damage of steel-steel couples under coupling of rolling and sliding is caused by the interaction of mechanical fatigue with dynamical phenomena of rolling and sliding friction. Lubrication directly determines the friction and wear behaviors. Under dry friction, the wear mechanisms of 20CrMnTi steel are mainly adhesive wear, abrasive wear, oxidation wear and fatigue pitting under dry friction. Under lubricating conditions, the wear mechanism of 20CrMnTi steel is mainly surface fatigue wear.
Highlights
In the mechanical transmission, such rolling friction pair under alternating load as gears and bearings is the key part in a machine
In such mining equipments as the reduction boxes of coal mining machines and boring machines, the gear is responsible for transmitting the torque of cutting motor to cutting drum
Because of hard working conditions, short downtime and bad lubricating conditions, the spare parts cannot be well lubricated or maintained. It results from serious gear wear and failure in reduction boxes of mining equipments [4]
Summary
In the mechanical transmission, such rolling friction pair under alternating load as gears and bearings is the key part in a machine. The load under coupling of rolling and sliding is a complicated process influenced by tribological load set and material properties, falling into the category of “the science of wear fatigue damage and inefficiency of loaded wear pair system in the machines and equipments” [2] In such mining equipments as the reduction boxes of coal mining machines and boring machines, the gear is responsible for transmitting the torque of cutting motor to cutting drum. This paper selects the gear material 20CrMnTi as the research object, makes an experiment of friction and wear under dry friction and lubrication and discusses friction fatigue behavior of 20CrMnTi steel friction pair under coupling of rolling and sliding to acquire the wear fatigue damage mechanism of low-speed and heavy-duty gear and provide theoretical foundation for its tribological design
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