STUDY ON CHANGE OF SURFACE ROUGHNESS OF CAM WHEN MACHINED ON THE POLISHING MACHINE BK.CMPM.12

Abstract

The surface roughness of machine parts in general and motor camshafts in particular is one of
the important parameters of the surface quality of machining. Surface quality directly affects
friction, wear and longevity of parts as well as the whole machine. Studying and selecting a set of
machining technology parameters to achieve the best surface quality of workparts has always been
interested in scientists. This paper presents the research results of cam surface roughness, which is
an indicator of surface quality, when polishing on the machine BK.CMPM.12. Experimental results
show that the surface roughness Rz decreases compared to that before polishing, respectively:
30.98%, 11.90%, 14.75% and 15.04% corresponding to 04 points measured in the cam
circumference, from the measuring point with the largest lobe lift in the direction of rotation. The
influence of normal pressure when polishing on surface roughness Rz is also indicated, whereby the
roughness at the cam position with the largest lift decreases about 13% compared to that of the
positions with smaller lift. The value of Rz in the remaining 2 locations is not much different, only
about 2.7%. This shows that the machining technology parameters, which has been selected, is in a
reasonable region with the method of polishing by abrasive belt.