The Challenge

Our client required a manufacturing solution for perforating 0.5mm steel plates with precisely positioned microscopic holes arranged in triangular arrays. The specifications demanded exceptional accuracy:

  • Hole spacing: 150-250 µm between centres
  • Hole diameter: 40-60 µm
  • Array configuration: Triangular pattern with close tolerances
  • Production volume: Individual parts containing tens to hundreds of thousands of holes

Traditional mechanical drilling methods were unsuitable for this application due to the microscopic scale and the prohibitive time requirements. With conventional drilling taking several seconds per hole, processing a single part with 40,000+ holes would have resulted in excessive production times, making the process commercially unviable.

Our Solution

We developed a bespoke laser drilling process utilising a Q-switched nanosecond pulsed fibre laser system. Our approach involved:

Development Phase

  • Systematic parameter optimisation to achieve precise hole geometry
  • Small-scale array prototyping to validate spacing accuracy (±10 µm tolerance)
  • Diameter control development (±2 µm tolerance)
  • Process scalability assessment

Production Implementation

  • Transition to full-size hole arrays
  • Resolution of large-scale production challenges
  • Process optimisation for manufacturing efficiency

 

Figure 1: Close-up microscopic view of the completed micro-hole array, demonstrating the precision triangular pattern achieved through our laser drilling process.

 

Results Achieved

The finalised manufacturing process delivered:

  • Precision: Hole spacing accuracy within ±10 µm
  • Consistency: Hole diameter tolerance within ±2 µm
  • Production Rate: 5,000-6,000 holes per minute (depending on specific pattern requirements)
  • Quality: Repeatable, high-quality results across large-scale production runs

Key Benefits

Speed: Our laser drilling process dramatically reduced production time compared to mechanical alternatives, making high-volume production economically viable.

Precision: Achieved microscopic tolerances essential for the application's performance requirements.

Scalability: Successfully transitioned from prototype to full production scale whilst maintaining quality standards.

Flexibility: Process parameters can be adjusted to accommodate varying hole patterns and specifications.

This case study demonstrates our capability to develop innovative laser drilling solutions for challenging micro-manufacturing applications, delivering both precision and production efficiency.