📋 Case Study

Energy Sector Large-Diameter Valve Body Fixture for Turning & Boring

Gravitational sag and thermal warping during 14-hr turning cycles caused bore concentricity errors > 0.35 mm

🏗️ Project Overview

Offshore subsea gate valve production (DN1200, 1200 kg cast duplex stainless steel)

Gravitational sag and thermal warping during 14-hr turning cycles caused bore concentricity errors > 0.35 mm

Segmented hydrostatic support ring + thermally anchored datum ring + real-time deflection monitoring via LVDT array

AI-generated project design illustration

P = W / A

Result: 1.8 MPa

Balances weight without plastic deformation

ΔT_max = σ_yield / (α·E)

Result: 12.3°C

Prevents creep in Invar anchor ring

ΔV/V = k·δ

Result: 0.12 mV/µm

Resolves < 0.5 µm deflection changes

Concentricity improved from 0.41 → 0.09 mm; cycle time reduced 18% via adaptive feed override; zero rework in last 17 valves

•Hydrostatic fluid viscosity must remain stable across 5–45°C ambient range
•LVDT mounting must avoid thermal expansion interference paths
•Datum ring material must match coefficient of thermal expansion within ±0.5 ppm/°C of workpiece

1Hydrostatic fluid viscosity must remain stable across 5–45°C ambient range
2LVDT mounting must avoid thermal expansion interference paths
3Datum ring material must match coefficient of thermal expansion within ±0.5 ppm/°C of workpiece

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