English: Molybdenum Heat-Shield Cup CNC Tooling Case: Deep Blind Bore and Thin Lip
This hypothetical case treats a molybdenum heat-shield cup as a bore-stiffness problem: the deep blind bore, 0.8 mm lip and radial cooling holes must all reference the mounting face.
Feature-to-tool selection
| Feature | Tool | Decision |
|---|---|---|
| Blind bore | Ø16 carbide boring bar, 3×D reach, anti-vibration holder | Stiffness prevents taper; long HSS bar chatters. |
| Thin lip | PCD-tipped finish tool, R0.2 | Low force; broad insert rolls the edge. |
| Radial holes | Ø2.5 through-coolant carbide drill | Short chips and position control. |
Face datum A first, rough the bore with constant engagement, then finish the lip while an expanding mandrel supports the wall. Inspect bore axis, lip thickness, burrs and Ra after thermal stabilization.
FAQ
Why not use a long HSS boring bar?
It loses stiffness and heat control; carbide with damping is selected.
deep-bore axis control · tool overhang control
