Centrifugal Spin Casting & Rubber Mold Runner Gating Calculator
Engineering preflight calculator for centrifugal spin casting with vulcanized silicone and rubber molds (RTV/VLC). Computes rotational G-force, gate injection pressure, Archimedean curved runner geometry, alloy thermal shrinkage scaling, and total shot weight.
1. Input Parameters
2. Calculation Results
3. Geometric Visualizer
Tooling & Vector Prepress Engineering Notes
Centrifugal Spin Casting Fluid Dynamics: Centrifugal rubber mold casting (CRMC) uses vulcanized silicone rubber discs rotating at high speed (400–1,000 RPM) to force molten zinc or pewter alloys into intricate mold cavities under 40–120 Gs of centrifugal acceleration. Extreme G-forces eliminate air entrapment and fill razor-sharp micro-details ($<0.1\,\text{mm}$) that conventional gravity casting cannot resolve.
Archimedean Curved Runner Gating: Instead of straight radial channels that cause turbulent splashing and early freezing, runners must follow backward-curving Archimedean spiral vectors ($r = a + b\theta$). This allows molten metal to accelerate smoothly against the Coriolis force, achieving laminar mold filling.
Compound Shrinkage Compensation: Final cast dimensions reflect two cumulative thermal shrinkage stages: (1) Rubber vulcanization mold shrinkage ($1.5\% - 3.5\%$) and (2) Solidification metal alloy shrinkage ($0.6\% - 1.4\%$). Prepress master model CAD vectors must be scaled up by the compound expansion factor ($S_{\text{total}} = (1 + S_{\text{rubber}}) \times (1 + S_{\text{alloy}}) - 1$).