Project Overview
A major OEM faced a manufacturing crisis after multiple engine failures in the field were traced to a defective support casting supplied through its Tier 1 supplier. Further inspection revealed that more than 50 additional castings awaiting installation on the production line were also defective, forcing the OEM to scrap the parts and halt production.
The Tier 1 supplier needed a foundry that could quickly identify the root cause of the failures, engineer a reliable replacement and restore production without compromising quality.
State Line Foundries responded by combining metallurgical expertise, advanced casting simulation and rigorous quality validation to solve the problem.
Key Challenges
Production Shutdown
Defective support castings, which had been supplied by a Tier 2 supplier, caused multiple engine failures in the field and forced the OEM to stop production after discovering more than 50 additional defective parts awaiting installation.
Root Cause Identification
The immediate priority was determining why the castings had failed rather than simply reproducing the existing design.
Process Redesign
The replacement castings required an entirely new manufacturing process because the original supplier had used gray iron instead of the specified ductile iron. The different material properties required new tooling, gating, risers and mold design.
Restoring Customer Confidence
After the production failure, the OEM needed confidence that both the castings and the manufacturing process would meet stringent quality requirements before production resumed.
State Line’s Approach
1. Comprehensive Failure Analysis
- Conducted detailed metallurgical testing on failed castings
- Identified substandard ductile iron microstructure, internal porosity and material properties that failed to meet specifications
- Determined the original castings had been produced with gray iron rather than the specified ductile iron
2. Advanced Process Engineering
- Redesigned the complete casting process rather than duplicating the previous method
- Optimized tooling, gating, risers and mold design
- Used advanced solidification modeling to simulate molten metal flow before production
- Eliminated potential shrinkage, hot spots, gas entrapment and incomplete filling prior to the first production pour
3. Rigorous Quality Validation
- Verified every casting through:
- X-ray inspection
- Dimensional inspection
- Tensile testing
- Microstructure analysis
- Dedicated engineering, production and quality resources to accelerate validation without sacrificing quality
4. Complete Transparency
- Invited OEM representatives to observe the first production pour
- Walked the customer through every inspection, validation and quality-control procedure
- Demonstrated both product quality and process reliability throughout production
Results
- Replacement castings engineered, validated and shipped within two weeks of receiving pattern tooling
- OEM production successfully restarted
- Production process redesigned to eliminate the causes of the original failures
- Every casting verified through comprehensive inspection and mechanical testing
- Customer confidence restored through complete manufacturing transparency
- Emergency response evolved into an ongoing production partnership
Conclusion
What began as an emergency response to catastrophic casting failures became an opportunity for State Line Foundries to demonstrate the value of engineering expertise and disciplined process control.
Rather than simply replacing defective parts, State Line redesigned the manufacturing process and validated every step before production began. The result was a rapid return to production and a renewed confidence in both the castings and the manufacturing process. This further established State Line as a trusted partner for solving critical manufacturing challenges. State Line was able to accomplish this without inconveniencing its other customers.
Do you have a project with tight timelines and high complexity?
Contact State Line to make sure your next critical project is an unqualified success!