Coupled tribo-dynamic modelling of linear guideways for high precision machining application

Abstract

Linear guideways play a crucial role in determining precision of machine tools. Understanding their dynamic response is essential for objectively controlling their behavior and performance in operation. Due to highly loaded lubricated contacts, mixed-elastohydrodynamic regime is dominant. The mixed-elastohydrodynamic film maintains the coupling between horizontal degree of freedom (feed velocity) and vertical degree of freedom (loading direction). This paper presents a novel tribo-dynamic solution for linear guideways, taking in to account the lubricant effects and coupling between horizontal and vertical degrees of freedom. An analytical tribology model is used implicitly within the dynamic model. For in-depth tribological quantities including pressure and film thickness distribution, an explicit full numerical solution for mixed-elastohydrodynamic is utilized. Results show that the coupled solution of vertical and horizontal degrees of freedom taking in to account lubricated contacts is essential. It is shown that at moderate and light loads, the effect of this coupling and presence of lubricant is more pronounced.

Effect of Lubricant Starvation on the Tribo‐Dynamic Behavior of Linear Roller Guideway

“…A key aspect in applying realistic boundary conditions is the consideration of inlet starvation. It is demonstrated numerically [25][26][27] and experimentally [28][29][30] that at contact reversal, mixed or boundary regimes of lubrication are dominant. erefore, determination of appropriate boundary conditions considering contact starvation is essential to accurately ascertain the tribological conditions.…”

“…e proposed models also do not cover the frictional phenomena such as sliding, presliding, and lag in these modes. Soleimanian et al [25] pioneered a tribo-dynamic system. e model showed the coupling between tribology and dynamics but did not take into account detailed realistic boundary conditions.…”

Research on nonlinear static and dynamic characteristics of linear guideway in machine tools considering carriage flexibility

“…Oh et al [18] proposed a friction force model for the linear guideway, and discussed the effects of the ball size, lubricant viscosity and contact angle on the friction force distribution. Soleimanian et al [19] established the tribodynamic model of linear guideway considering the lubricant effect and two degree-of-freedom coupling. Cheng et al [20,21] established the friction model of the linear guideway including the roller resistance, sliding and rolling frictions, and analyzed the influences of the geometric parameters and operating conditions on the friction performance.…”

Simulation study on the performance of gap oil film lubrication under extreme working conditions of micro‐textured hydrostatic support

“…Arif et al 17 solved the modified Reynolds equation considering the Elrod cavitation model and studied the comprehensive effects of sliding boundary conditions and non‐Newtonian lubricants on the tribological properties of hydrodynamic textured journal bearings. Soleimanian et al 18 used a hybrid elastohydrodynamic to solve the oil film pressure and thickness. Xie et al 19 analysed the influence of circumferential inclination on the lubrication characteristics of the thrust bearing oil film.…”