Journals Proceedings

International Journal of Fluid Mechanics & Machinery

Impact of Ball-Screw Pre-loading on Thermal Behavior Simulation of Vertical Machining Center During End-Milling Operation

Author(s) : P GANESAN, P R THYLA, SUNILKUMAR S HONNUNGAR, V PRABHU RAJA

Abstract

Thermal drift at tool centre point (TCP) is caused mainly due to positional errors in feed drive system of machine tool. The important sources of these errors are frictional heat generated at contact areas such as ball screw-nut, bearing races and balls. In addition to this, heat losses of motor also contribute resulting in thermo-elastic deformation in feed drive system. The objective of the work presented here is to predict and analyse the thermal behavior at key locations of feed drive system by considering pre-load on ball-screw of feed-drive system. The boundary conditions in simulation were applied considering the losses incurred in bearing, nut as well in motor during end milling operation considering with and without pre-loading of ball-screw. The simulation model was developed and validated with the experimental data recorded on feed drive system of a Vertical Machining Center (VMC) considering non-cutting operation prior to this. The developed model may be used for design optimization of feed drive system. The virtual method explored here also avoids lot of physical experimentation that would have been conducted for knowing thermal behaviour of feed drive in machine tool with and without considering preloading of ball-screw.

No fo Author(s) : 4
Page(s) : 11 - 17
Electronic ISSN : 2374 - 1481
Volume 1 : Issue 2
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