Experimental Analysis of a Machining System with Adaptive Dynamic Stiffness
2013 (English)In: Journal of Machine Engineering, ISSN 1895-7595X, Vol. 13, no 1, 49-63 p.Article in journal (Refereed) Published
A main consideration in the operation of machine tools is vibrations occurring during the cutting process.Whether they are forced vibrations or self-excited ones, they have pronounced effects on surface quality, tool lifeand material removal rate. This work is an experimental study of interactions between natural characteristics,control parameters and process parameters of a machining system designed with adaptive dynamic stiffness. Inorder to comprehend these interactions, the effect of changes in dynamic stiffness on the system’s response isexamined. The system under study consists of an end-milling tool, a steel workpiece and a work holding devicewith controllable stiffness. Natural dynamic characteristics of the system components are determined throughmodal impact testing. Then the behaviour of the whole machining system is examined under both high and lowcutting speed conditions by analysing vibration levels using acceleration signals acquired through a tri-axialsensor mounted on the workpiece. Cutting is performed in both directions of the horizontal plane of a CNCmilling machine. In both cases the results are presented for two extremes of stiffness and damping in the workholding device. The effect of control parameters on the system’s natural characteristics could be identifiedtogether with a relation between these parameters and the system’s response in high and low cutting speedconditions. The high-damping configuration reduces the vibration amplitudes significantly, while the increaseof pre-stress has a different effect depending on the cutting conditions.
Place, publisher, year, edition, pages
Wroclaw, Poland: Wroclawska Rada Federacji Stowarzyszen Naukowo-Technicznych NOT , 2013. Vol. 13, no 1, 49-63 p.
vibrations, milling, damping, stiffness, adaptive structure
Production Engineering, Human Work Science and Ergonomics
Research subject SRA - Production
IdentifiersURN: urn:nbn:se:kth:diva-140719OAI: oai:DiVA.org:kth-140719DiVA: diva2:692526
ProjectsEU FP7 PoPJIM
FunderXPRES - Initiative for excellence in production research
QC 201402052014-01-312014-01-312014-02-05Bibliographically approved