ODM Metal Punching s Manufacturers & Products

For precision progressive metal punching and fine blanking operations, Sunmy routinely holds feature-to-feature center distances and pitch tolerances to ±0.005 mm (5 microns) under climate-controlled stamping conditions. Aperture hole diameters are held within ±0.008 mm depending on material thickness, tensile strength, and alloy hardness.

For secondary CNC post-machined features (such as bearing bores, O-ring sealing grooves, and dowel locating holes in thick stampings), we verify true positional concentricity within ±0.005 mm using our in-house Zeiss coordinate measuring machines (CMM).

Slug-pulling and burr propagation are the two most prevalent failure modes in sheet metal punching. Sunmy prevents these issues through a multi-tiered engineering approach:

• Engineered Die Clearances: We precisely calculate punch-to-die clearance between 7% and 14% of sheet thickness based on material shear-strength FEA models, preventing double shear rings and severe burr emergence.
• Anti-Slug Design Geometry: Punches are engineered with spring-loaded ejector pins, vacuum suction assist ports beneath the die bed, or rooftop/shear-angle cutting faces that mechanically prevent slugs from sticking to the punch face.
• Advanced Tool Coatings: All micro-punches and cutting inserts utilize hardened ASP-23, Vanadis 4, or sub-micron tungsten carbide coated with TiAlN or DLC (Diamond-Like Carbon) to resist adhesive galling.

To deliver uncompromising quality ownership, Shenzhen Sunmy Hardware owns and directly operates its high-precision CNC machining centers (3, 4, and 5-axis), Swiss-type turning lathes, and precision sheet metal stamping/punching facilities in Shenzhen. Casting (die casting, investment casting) and bulk surface finishing (electropolishing, automated anodizing, powder coating) are performed by ISO-certified partner plants under our direct supervision.

Crucially, 100% of final quality control, first article metrology, CMM dimensional verification, spectrographic material analysis, and export packaging are conducted in-house by Sunmy quality engineers before any crate departs Shenzhen.

Every overseas shipment is accompanied by a comprehensive quality dossier designed to clear customs and pass customer receiving audits without friction:

• Full First Article Inspection (FAI) reports mapped to ballooned 2D engineering drawings.
• Batch CMM dimensional inspection logs with statistical Cp and Cpk values (maintaining Cpk > 1.67 on critical-to-quality dimensions).
• Original raw material test certificates (MTC 3.1) showing metallurgical chemical analysis and tensile/yield stress test results.
• RoHS 3 and REACH chemical compliance certifications verified by internal XRF testing.
• Surface finish measurement reports detailing coating thickness (anodizing microns, plating thickness) and surface roughness (Ra/Rz).

Progressive die tooling requires significant capital allocation ($5,000 to $50,000+). To protect our clients, we deploy a staged prototype validation pathway. We utilize fiber laser cutting, wire EDM, precision CNC turret punching, and modular stage bending dies to produce functional pre-series prototypes (10 to 1,000 units) from the exact production alloy.

This allows your mechanical engineering team to conduct physical fit checks, structural stress tests, and environmental validations before cutting steel for multi-station progressive stamping tools.

Standard lead times across typical project stages include:

• DFM & Tooling Strip Layout: Completed within 24 to 48 hours following CAD submission.
• Rapid Prototyping (Laser/EDM/CNC): 5 to 7 business days.
• Progressive Stamping Tool Fabrication: 20 to 35 business days depending on die complexity and number of stations.
• T1 First Article Samples with FAI Report: Dispatched via air express (DHL/FedEx) within 3 business days following mold completion.
• Mass Production Cycle: 2 to 3 weeks upon receipt of written FAI golden sample sign-off.