This complex silver metal part is a custom-produced Wheel Hub Bearing Carrier (or Knuckle) manufactured by RPS for a company focused on high-performance and motorsport applications. As a critical structural component connecting the wheel, brake system, and suspension, it must maintain geometric accuracy and structural integrity under extreme dynamic loads.

Leveraging our decades of experience serving the automotive and aerospace sectors, RPS utilized Multi-Axis CNC Machining technology to successfully transform high-strength aluminum into a key automotive safety component with complex internal stiffening ribs and ultra-tight tolerance requirements.

Client Challenge: Extreme Load, Lightweighting, and Safety Certification

The automotive industry, particularly the high-performance sector, imposes extremely rigorous demands on the manufacturing of safety-critical components:

1. Structural Strength and Dynamic Fatigue: The part must withstand multi-directional, high-frequency stresses from road impact, cornering centrifugal force, and braking torque. It requires guaranteed resistance to fatigue failure over long-term use.
2. Ultimate Lightweight Design: To enhance vehicle handling (especially unsprung mass), the part employs complex pocketing designs (internal rib structures) for weight reduction, which significantly increases the complexity and duration of the CNC machining process.
3. Strict Dimensional and Geometric Precision: The central bore must precisely fit the wheel bearing (typically H7 tolerance), and the concentricity and perpendicularity between all mounting points and reference faces must meet micron-level requirements to ensure accurate wheel alignment and braking performance.

RPS Solution: 5-Axis Machining and IATF 16949 Quality Assurance

To meet the safety and precision needs of high-performance automotive parts, RPS implemented a systematic manufacturing solution:

1. Material Selection and Strength Optimization

• Material: Selected high-strength, lightweight Aluminum Alloy (e.g., 7075-T6 or specific grades).
  • Advantage: 7075-T6 offers yield strength comparable to many steels while weighing only one-third, making it the ideal choice for high-performance lightweighting.
• Material Certification & Traceability: Strict adherence to IATF 16949 standards for raw material certification and heat/lot number management ensures material properties perfectly match design specifications.

2. Multi-Axis Precision CNC Machining

• Core Technology: Utilization of 5-Axis Machining Centers.
  • Advantage: The part’s complex geometry (multiple angles, deep pockets, and internal ribs) demanded that all machining be completed in one or the fewest possible setups. 5-axis technology eliminates re-clamping positioning errors while efficiently and precisely completing the complex internal pocketing and external attachment points.
• Key Feature: The central bearing mounting bore was finished using Fine Boring processes, with tolerances controlled to within 0.005 mm (based on the client profile), ensuring a perfect press fit for the bearing and low-friction operation.

3. Surface Treatment and Corrosion Protection

• Surface Finish: Chromate Conversion Coating (Alodine) or Clear Anodizing.
  • Purpose: To provide excellent corrosion protection without affecting the electrical conductivity and critical dimensions of the key connection areas, especially for automotive undercarriage use in humid or salt spray environments.

Manufacturing Highlights & Technical Specifications

Results and Client Value: Race-Ready Performance Guarantee

Through RPS’s expert CNC manufacturing and rigorous quality control, the client achieved the following core value:

• Performance Boost and Reliability: The component’s ultra-high precision and optimized design effectively reduced unsprung mass, improving vehicle responsiveness and handling limits while ensuring long-term structural reliability.
• One-Stop Automotive Manufacturing: RPS’s IATF 16949 certification and one-stop service (from precision 5-axis machining to corrosion treatment) eliminated the need for complex supply chain management and quality auditing processes for the client.
• Perfect Realization of Complex Design: Successfully transforming the complex internal stiffening rib structure into a physical part demonstrates RPS’s leading capability in CNC machining of complex geometries.

Does Your Next-Generation Automotive Component Require Top-Tier Manufacturing Precision?

RPS offers 20 years of experience and quality assurance certified by the IATF 16949 automotive standard. We specialize in the precision manufacturing of CNC machined, 3D printed, and sheet metal parts.

Upload your design drawings now to start a collaboration with our automotive component expert team!