Date of Award
2006
Degree Type
Thesis
Degree Name
Master of Engineering Science
Program
Mechanical and Materials Engineering
Supervisor
Prof. Hsi-Yung (Steve) Feng
Abstract
In pocket machining, variable radial depth of cut is generally encountered during the entry and exit of an end milling tool in a corner, which causes significant changes in the material removal rate and cutting force. Moreover due to the tool path geometry in corner machining, feed rate variation is introduced. The practical characteristics of the machine tool lead to time lag during the changes of the feed rate. In the present research on corner machining, a multiple looping tool path is proposed, based on a maximum permissible material removal rate constraint to limit the maximum permissible radiai depth of cut. Based on the machine tool characteristics, tool path geometry and tool diameter, a constant feed rate strategy is implemented in the looping tool path comprising a number ofsmoothly connected linear and circular segments. For a particular cutter, both maximum allowable feed rate and axial depth of cut are maintained constant. Thus maximum allowable material removal constraint is reached corresponding to the maximum radial depth of cut. In each cutting pass, a circular arc is introduced with the linear tool path to ensure that, both material removal rate constraint and constant feed rate are achieved. Considering the total machining time in corner machining, single cutter and double cutter strategies have been proposed in the tool path planning for a given corner geometry. The material removal rate and total machining time have been calculated and their trends analyzed for different cutting conditions
Recommended Citation
Rahman, A.K.M. Arifur, "CONSTANT FEED RATE BASED TOOL PATH PLANNING IN CORNER MACHINING" (2006). Digitized Theses. 4996.
https://ir.lib.uwo.ca/digitizedtheses/4996