Gas Turbine Blade Casting

A company was experiencing short service life on bearings used in gas turbine blade casting. An extremely aggressive solution combined with high loads and misalignment caused lubrication and retention problems. Alongside improvements in sealing and lubrication, an alternative wheel design using sealed cylindrical roller bearings was proposed; performance improved dramatically and service life doubled.

• Gas turbine casting — 3 machines
• Bearings replaced every 6 weeks
• Aggressive solution: 50% sodium hydroxide at 180°C
• Application design change on the carousel wheel + NSK sealed cylindrical roller bearing
• Bearing life extended from 6 weeks to 12–14 weeks
• Reduced downtime and maintenance costs

Technical Features: Sealed Cylindrical Roller Bearing

• High load capacity
• Highly corrosion-resistant phosphate coating
• Contact seals prevent ingress of foreign particles or water
• Increased radial and axial capacity
• Bearings pre-lubricated with lithium grease
• Relubrication holes for easy maintenance and grease replenishment
• Retaining ring (DIN 471) can be fitted to the outer ring