Project Background

The customer is a domestic rail transit equipment manufacturer procuring axlebox bearings for a vehicle project supporting a newly built urban metro line.

Technical Requirements

Design speed: 120km/h
Service life: Over 1.2 million kilometers
Precision grade: P4 grade
Reliability requirement: failure rate < 0.5‰ per million kilometers
Certification requirement: Compliance with CRCC railway product certification

Solution

Product Selection: Double-row tapered roller bearings were adopted, featuring an integrated sealing design and a maintenance-free structure.

Material Upgrade: Electroslag remelting bearing steel was used, achieving high-grade purity and homogeneity.

Precision Machining: Full-process CNC machining was employed, with key dimensional accuracy controlled at the micron level.

Quality Assurance: 100% ultrasonic flaw detection, magnetic particle inspection, and full dimensional inspection.

Project Achievements

Successfully passed CRCC certification and customer vehicle-installation validation
The first batch of 500 units was delivered, with over 12 months of operation and zero failures
Awarded the customer's Annual Outstanding Supplier title
Subsequent follow-up orders totaled more than 2,000 units