Real projects, real results. Explore how Sunmy has helped OEMs, engineering teams, and product developers across Europe and North America bring their designs to life — from complex CNC machined parts and precision turning to stamped components, castings, and injection-molded assemblies.
Each case study shows the challenge, the process, and the outcome — including how we handled material selection, tolerances, surface finishing, and quality verification with CMM and FAI.
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EMI/RF Shielding Can
Custom Precision Stamped Tin-Plated SPCC EMI/RF Shielding Can (65x28x3mm)
Precision Progressive Die Stamping, Precision Bending, Tin Plating
During surface mount technology (SMT) reflow soldering, the 65mm long-span low-profile (3mm) shielding cans experienced thermal distortion, resulting in a coplanarity deviation exceeding 0.12mm. This lack of flatness caused localized solder joint failures (tombstoning/voids) and severe RF leakage in the high-frequency electronics module. Additionally, micro-tearing occurred at the stepped inner corners during the 90-degree bend, degrading the continuous Faraday cage effect.
Sunmy Hardware engineers conducted structural FEA to identify stress concentration zones. We redesigned the progressive die layout by integrating localized stress-relief notches and implementing a multi-stage forming sequence to minimize springback. A pre-tin-plated SPCC material with optimized grain orientation was selected to eliminate post-plating corner buildup. We maintained strict flatness controls using laser profilometry to guarantee coplanarity under 0.05mm across the entire 65mm span.
Achieved 100% SMT yield rate with zero RF leakage detected. The co-planarity was consistently held below 0.03mm, and production scaled to 500,000 units/month with a stable Cpk > 1.66.
Established in 2016, Sunmy specializes in custom metal and plastic parts made from 2D drawings, 3D models, or physical samples. Our capabilities include CNC machining, precision turning, casting, sheet-metal stamping, injection molding, tooling development, surface finishing, and assembly.
