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University of Nevada Las Vegas |
MEG426/626 Manufacturing Processes |
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Department of Mechanical Engineering |
Fall Semester 2000 |
Cutting Mechanics (II)
Power and energy relationship in Machining
:
P = Fc v
where p is cutting power (N-m/s or W); Fc is cutting force (lb. or N), and v is cutting speed (ft/min, m/s).
Convert it to horsepower hpc:
hpc = Fc v/ 33,000
gross horsepower of the machine tool motor hpg:
hpg = hpc / E
where E is mechanical efficiency of the machine tool, Typically around 90%.
Cutting Temperature
about 98% of the total energy - is converted into heat;
about 2% - elastic deformation (chip, work, and tool).
Analytical Methods
(a). Finite differential equations,
(b). Finite element method (FEM).
Experimental Methods
(a). Nature thermocouple,
(b). Tool-work thermocouple.
(there is no tool-chip thermocouple)
Created by Dr. Wang