Challenge
A ventilation system manufacturer approached Microkerf to develop an innovative laser drilling solution for creating precise holes in brass pneumatic cylinders. The client required holes that would deliver specific flow rates at predetermined pressures, but their existing manufacturing process presented significant challenges.
The traditional method involved a geometrically complex physical drilling process followed by bead erosion—a time-consuming and costly approach that also necessitated an intricate cylinder design, further increasing production expenses.
Solution
Our engineering team developed a sophisticated laser drilling process utilising a nano-pulsed fibre laser with galvanometer beam delivery system. This approach addressed both the client's immediate manufacturing challenges and enabled fundamental design improvements.
Key Technical Innovations
Rapid Processing: Individual holes could be created in less than 5 seconds, with complete 11-hole arrays processed in approximately 30 seconds—dramatically reducing production time compared to conventional methods.
Enhanced Design Flexibility: Laser drilling enabled optimisation of hole geometry for the beam scanning mechanism. Through extensive testing, we determined that square holes offered superior controllability and could be drilled with exceptional precision using laser technology.
Geometric Optimisation: Our analysis of hole configurations revealed that whilst square holes provided excellent control, rounded corner variants demonstrated superior structural robustness for the application.
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Figure 1: Square-cornered hole configuration offering precise control |
Figure 2: Rounded-corner hole design providing enhanced robustness |
Process Development
Mathematical Modelling
We developed an iterative flow rate mathematical model that analysed flow test data to predict optimal hole dimensions. Through several refinement cycles, this model achieved remarkable accuracy, consistently producing holes with flow rates within 1-2% of nominal requirements—significantly exceeding the client's specification of 10% tolerance.
Quality Assurance
Comprehensive testing of the first 50 production components enabled us to establish process tolerances and validate production reliability. Statistical analysis indicated process quality at 4σ, corresponding to an exceptional drilling failure rate of just one occurrence per 15,000 holes.
Results
The pilot production run encompassed 2,500 components, all of which underwent rigorous client testing. The results exceeded expectations:
- Quality Achievement: Only a single hole on one component was found to be out of specification
- Actual Failure Rate: 1 in 27,500 holes—substantially better than the predicted 4σ performance
- Cost Reduction: Significant savings achieved through faster processing and simplified cylinder design
- Production Efficiency: Dramatic reduction in manufacturing time whilst maintaining superior quality standards
Benefits Delivered
Manufacturing Efficiency: The laser drilling process proved substantially faster and more cost-effective than traditional methods, enabling higher throughput with reduced labour requirements.
Design Simplification: Elimination of the complex physical drilling process allowed for a much simpler cylinder design, reducing both manufacturing complexity and associated costs.
Quality Excellence: Achieved flow rate accuracy within 1-2% of specifications, far exceeding the required 10% tolerance whilst maintaining exceptional process reliability.
Scalability: The proven process has been successfully scaled to full production, delivering consistent quality across thousands of components.
This case study demonstrates Microkerf's capability to develop innovative laser drilling solutions that not only meet but exceed client specifications whilst delivering significant cost and efficiency benefits.