High-Quality Brass Stamping Exporter & Factory

Pure copper (such as C11000 ETP) provides superior electrical conductivity (around 100% IACS) but has higher ductility, which often leads to severe tearing, edge burring, and sticking inside die punches. Brass (Cu-Zn alloy) introduces zinc to dramatically enhance shear strength, yield point, and stiffness, making high-speed progressive shearing and punching much cleaner. However, brass alloys have pronounced springback characteristics that must be accounted for via FEA stamping simulations and compensated die punch angles during initial DFM reviews.

All high-volume progressive stamping tools are constructed using high-grade carbide inserts (such as KD20, Sumitomo, or DAIDO tungsten steel) in dynamic punching and forming stations. Tool frames utilize precision guide pins and ball cages from MISUMI or FIBRO. Additionally, our presses feature acoustic emission sensors and optical in-die strip position detectors that trigger an emergency stop if misfeeds or die clearances vary by more than 0.005 mm, preventing die damage and scrap batch production.

We purchase certified strip coils exclusively from audited, reputable raw material mills (e.g., Chinalco, Wieland, or KME). Every incoming batch arrives with mill test certificates (MTC) stating precise chemical spectrometry. In addition, our in-house QC laboratory utilizes optical emission spectrometry (OES) and XRF scanners to test raw metal strips and finished stamped samples, guaranteeing that lead concentrations remain beneath regulatory limits (< 0.1% for lead-free or strictly documented under EU RoHS exemption 6(c)).

Every export shipment includes a comprehensive quality dossier: First Article Inspection (FAI) reports covering all GD&T callouts, Certificate of Analysis/Material Test Certificates (COA/MTC) with heat lot traceability, coordinate measuring machine (CMM) dimensional verification charts, plating thickness reports (measured via X-ray fluorescence), and a Certificate of Conformance (COC) signed by our lead quality engineer.

Bare brass is chemically sensitive to moisture, saltwater vapor, and sulfuric gases present in maritime environments. Depending on part geometry and assembly requirements, we apply organic anti-tarnish inhibitors (e.g., benzotriazole passivation) or inert chemical cleans. Packaging incorporates vapor corrosion inhibitor (VCI) bags filled with desiccants, vacuum-sealed barrier liners, and custom thermoformed plastic trays or reel carrier tape designed to mechanically immobilize delicate terminals against inter-part rubbing.

Yes. As an integrated manufacturer, Sunmy maintains dedicated CNC machining centers, Swiss precision turning lines, stamping presses, and injection molding machinery on the same campus. We routinely produce multi-process engineered assemblies: stamping brass lead frames, overmolding them with engineering polymers (PBT, PA66, PPS), and tapping high-tolerance threads or turn-milling mating studs in a single, coordinated production flow.