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A Study of Fixture Layout and Clamping Force for a Ti-6Al-4V Disk in a Vertical Turning Lathe Numerically Controlled Machine. Maureen Fang Sept 17, 2009. Overview. Vertical Turning Lathe (VTL) Machine Fixture-Disk Assembly Cutting Forces Finite Element Models in ANSYS
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A Study of Fixture Layout and Clamping Force for a Ti-6Al-4V Disk in a Vertical Turning Lathe Numerically Controlled Machine Maureen Fang Sept 17, 2009
Overview • Vertical Turning Lathe (VTL) Machine • Fixture-Disk Assembly • Cutting Forces • Finite Element Models in ANSYS • Initial Fixture Layout • Deflections within Disk • Questions
Fixture-Disk Assembly Disk Inner Diameter=0.457m (18 in) Outer Diameter=0.508m (20 in) Height=0.0508m (2 in) Clamp Locator Plate
Machining an Outer Diameter Cutting Tool
Tool Geometry Machining Parameters Input Variables
Cutting Forces • Results are generated by Matlab codes for both oblique and orthogonal cutting • Orthogonal cutting has only two cutting forces components • Tangential force is the dominate component. Tangential Force Orthogonal Cutting
Clamps, Locators, and Cutting Forces applied to Initial Fixture Layout • Locators are constraint in 3 axis • Clamping Force = 1500N
Deflections within a Finish Cut • The “U” shape curve presents the magnitude of deflection changes as the cutting tool travels from the top to the bottom surface of the disk. • The displacement vector sum is largest at the top. • The subsequent models will have the cutting forces applied at the top surface.
Key Locations to Represent a Dynamic Machining Process ANSYS model is static analysis of a dynamic process. Therefore, selected cases are used to represent snap shots of the overall machining process. Point A, B, and C are key locations of disk where cutting forces have been applied, as disk rotates.
Displacement Vector Sum C A B
Displacement Components Z-component = axial direction Y-component = circumferential direction X-component = radial direction Clamp and locator is aligned with cutting forces at Key Location “B”