📋 Case Study

Medical Stainless Steel (17-4PH) CNC Turning for Implant Components

Micro-cracking at surface due to excessive heat and residual stress

🏗️ Project Overview

FDA-certified orthopedic implant manufacturing

🎯 Challenge

Micro-cracking at surface due to excessive heat and residual stress

🔧 Design Approach

Low-speed finishing pass with sharp ceramic inserts, minimum depth of cut, and high-pressure through-tool coolant

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Residual stress prediction factor

σ_res ∝ v^0.4 × f^0.3 × ap^0.2

Result: 1.8

Below critical threshold of 2.0

Coolant jet velocity

v_jet = √(2ΔP/ρ)

Result: 120 m/s

Ensures penetration into shear zone

📊 Results

Zero micro-cracks detected via SEM; surface integrity verified per ASTM F3069; yield increased from 89% to 99.2%

💡 Lessons Learned

• •Surface integrity metrics trump dimensional tolerance in medical apps
• •Through-tool coolant pressure must exceed dynamic shear zone pressure

✅ Key Takeaways

• 1Surface integrity metrics trump dimensional tolerance in medical apps
• 2Through-tool coolant pressure must exceed dynamic shear zone pressure