Lubrication Analyses of Cam and Flat-Faced Follower

Abstract

The principal factors that affect the characteristics of contact problem between cam and follower vary enormously during the operating cycle of this mechanism. This includes radius of curvature, surface velocities and applied load. It has been found over the last decades that the mechanism operates under an extremely thin film of lubricant. Any practical improvement in the level of film thickness that separates the contacted surfaces represents an essential step towards a satisfactory design of the system. In this paper a detailed numerical study is presented for the cam and follower (flat-faced) lubrication including the effect of introducing an axial modification (parabolic shape) of the cam depth on the levels of film thickness and pressure distribution. This is achieved based on a point contact model for a cam and flat-faced follower system. The results reveal that the cam form of modification has considerable consequences on the level of predicted film thickness and pressure distribution as well as surface deformation.

Detachment Detection in Cam Follower System Due to Nonlinear Dynamics Phenomenon

“…Jamali et al discussed the parameters that affect the contact problem between the cam and flat-faced follower such as radius of curvature, surface velocities and applied load under thin film of lubricants. They improve numerically the level of film thickness lubricant by taking into consideration the parabolic shape of the pressure distribution through cam depth which reduced the detachment between the cam and the follower, [3]. Pugliese et al designed an apparatus to measure the contact force using an optical interferometry sensor with high speed camera.…”

Contact Force Measurements in Cam and Follower Lubricated Contacts

“…They found out that the reduction of friction losses is greater when both the cam and the tappet are coated. A study was presented in Jamali et al (2019) for the cam and follower lubrication including the effect of the introduction of an axial modification of the cam depth. Furthermore the contact point EHL problem was solved.…”

A Numerical Procedure Based on Orowan’s Theory for Predicting the Behavior of the Cold Rolling Mill Process in Full Film Lubrication

“…From the modelling and analysis point of view, however, the lubricant introduces significant issues, as a close interaction arises between metal strip deformation and lubricant fluid film flow; moreover, the lubricant influences the plastic deformation processes [12]. Film thickness is the most important parameter of a lubricated contact [13,14], even if experimental data are often deduced in dry conditions.…”

“…The novelty of the proposed model over the models presented in the works of [1][2][3][4][5][6][7][8][9][10][11] is that the influence of lubricants is considered. The novelty with respect to the presented previous models [12][13][14][15][16][17][18][19][20][21][22][23] is that the new model combines Orowan's inhomogeneous theory [24] for plastic deformation with the Reynolds equation in full film lubrication and the continuity conditions. The new proposed model presented in this paper and the previous model based on the slab analysis [23] share the representation of the lubrication regime, the mathematical procedure, and the boundary conditions, but in the new model, the plastic deformation of metal strips is described by means of Orowan's inhomogeneous theory, instead of the slab analysis.…”