Introduction
This case study by Ciprian Radu and Catalin Danaila from RKB Bearing Industries, Switzerland, explores the use of advanced CAD 2D/3D tools, proprietary computing software, and FEM analysis to improve the quality, reliability, and delivery time of bearings. The focus is on developing two spherical roller bearings for an oil platform rack and pinion jacking system.

CAD and FEM Analysis
RKB Bearing Industries utilizes CAD as a comprehensive analysis platform to optimize product performance and reliability. The process includes 2D drafting, 3D modeling, and calculation of main coefficients for bearings, offering advantages like reduced runtime and error minimization. Bearings for the oil platform were validated for load ratings and service life using proprietary software conforming to ISO standards.

3D CAD Benefits
3D CAD modeling facilitates the development of complex assemblies and interaction studies among components, reducing the need for prototypes and lowering costs. RKB uses CATIA V5 for 3D modeling, which allows for accurate stress analysis using FEM.

Application Model
The RKB Technical Department created a 3D model of the oil platform application, including bearings, housing, shaft, spacer, and pinion, to simulate the bearings' behavior under different load conditions.

FEM Analysis
FEM analysis is used for final validation of the bearings, involving pre-processing, processing, and post-processing stages. This includes creating a mesh of the model, assigning material properties, defining loads and constraints, solving algebraic equations, and interpreting data to ensure accurate results.

Specifications and Analysis

• Reaction Forces: Discusses reaction forces on bearings RKB 23048CAW33XS1A and RKB 23248CAW33XS1A.
• Safety Factor: Ensures the reliability of the bearing system.
• Assembly Stiffness and Shaft Deformation: Analyzes stiffness and static deformation of the shaft.
• Deformations: Measures deformations to determine if loads cause elastic or plastic deformations.
• Stress Levels: Measures stress levels, focusing on contact stresses between rollers and raceways.

Conclusions

• The RKB bearings used in the oil platform's rack and pinion lifting system meet customer requirements effectively.
• RKB Group employs advanced technologies and engineering expertise to develop high-quality bearings for demanding applications.
• The R&D department ensures assembly validation according to customer specifications, considering all factors influencing bearing performance.
• RKB Group offers reliable products, optimizing radial clearance and stress distribution to prevent damage and reduce project costs.

Key Points

• Roller Contact: Identifies the number of rollers in contact with the rings under load.
• Stress Distribution: Understanding stress distribution is crucial for identifying potential weak spots.
• Modern Software: Modern FEM software aids in visualizing data to simplify analysis.