Precision 5‑Axis Machining of Complex Curved FR‑4 Components

Precision 5‑Axis Machining of Complex Curved FR‑4 Components for Radar & Communication Equipment

Customer Region: Europe

Industry: Radar & Wireless Communication Equipment

Material: FR‑4 Fiberglass Epoxy Laminate

Process: 5‑Axis CNC Milling, Special PCD Tool Machining, Deburring, Edge Sealing

Order Scope: Functional Prototype → Low‑volume Batch Production

Project Background

Our European customer develops high‑performance radar antenna assemblies for ground‑station communication devices. They required large‑size, complex‑curved FR‑4 insulating structural parts. FR‑4 delivers excellent dielectric insulation performance for radio‑frequency signal transmission. The customer needed a reliable supplier to produce geometric‑challenging prototypes first, then support low‑volume serial manufacturing with stable edge quality and strict dimensional control.

Key Challenges

1.   Complex double‑sided curved contours with distributed mounting holes; multiple re‑clamping will introduce cumulative position deviation.
2.   FR‑4 glass‑fiber material tends to generate burrs, fiber fraying and edge chipping during cutting, which harms insulation performance.
3.   Thin‑wall curved features are prone to warping under cutting heat and mechanical stress. Tolerance requirement up to ±0.02 mm.
4.   Clean, sealed edges are mandatory to prevent moisture penetration and guarantee long‑term dielectric stability for radar service life.

Chenrong Technology Solution

1.   DFM review: Our engineering team optimized fillet radii and support layout without altering electrical‑function requirements, lowering risks of chipping and thin‑wall distortion.
2.   5‑axis one‑setup machining: Completed all curved surfaces, positioning holes and installation features in single clamping to eliminate re‑fixture positioning errors.
3.   Adopted dedicated PCD cutting tools and tuned high‑speed cutting parameters, reducing fiber fraying and burr generation on FR‑4 edges. Vacuum fixture was applied to suppress thin‑part warping.
4.   Specialized manual deburring and edge‑sealing post‑process to seal exposed glass‑fiber cross‑sections against moisture ingress.
5.   Full‑dimensional inspection including profile scanning; deliver inspection reports for every batch.

Final Outcome

• Prototypes passed customer dielectric‑property testing and dimensional verification on schedule. No fiber fraying or edge chipping on critical surfaces.
• Curved profile tolerance and hole‑position accuracy fully satisfied radar assembly requirements. Edge sealing improved environmental stability.
• Follow‑up low‑volume batches maintained consistent quality. The customer extended cooperation for new‑generation radar hardware development.