- Sales@tenghui-proto.com
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TENGHUI provides precision CNC turret punching services and custom sheet metal stamping for one-off prototypes, low-volume batches, and repeat high-volume production orders. We fabricate accurate hole patterns, slots, perforations, custom cutouts, louvers, knockouts, embossments, and formed mechanical features with consistent dimensions and dependable part-to-part repeatability.
Upload your DXF, DWG, PDF drawings, or 3D CAD files for rapid engineering evaluation within 24 hours.
CNC punching and metal stamping both utilize punches and dies, but they serve distinct manufacturing objectives. Our engineers evaluate your order quantity, geometric complexity, and tooling budget to designate the most cost-effective solution.
| Manufacturing Method | Best Suited For | Tooling & Setup | Core Engineering Advantages |
|---|---|---|---|
|
CNC Turret Punching
Flexible NC Sheet Processing
|
Prototypes & Low-to-Medium Batches
Ideal for perforated screens, ventilation enclosures, and rapid design changes requiring fast turnaround. |
Standard & Auto-Index Tools
Zero custom die fees; incorporates in-turret forming tools for louvers, embosses, and knockouts in the same setup. |
No tooling investment; instant CAD-to-NC programming with economical modification flexibility. |
|
Sheet Metal Stamping
Dedicated Press Die Tooling
|
High-Volume Serial Production
Optimal for repeat mass runs (5,000+ units) demanding tight tolerances and consistent dimensional repeatability. |
Dedicated Hard Tooling Dies
Requires upfront tooling design and precision tool-steel dies (single-stage, compound, or progressive dies). |
Lowest amortized unit cost; high-speed multi-feature blanking and forming in a single press stroke. |
Material suitability depends on alloy grade, temper condition, hardness, and required die clearances. We select optimal tooling geometries to ensure burr-free cut edges, precise hole patterns, and clean formed features.
SPCC, SPHC, DC01, DC05, Q235, Q355
Widely specified for chassis panels, mounting brackets, and structural covers. Offers predictable shear characteristics, minimal edge burrs, and stable formability for louvers and embosses.
SUS301, SUS304, SUS316, 316L
High tensile strength and work-hardening require increased punch press tonnage, tighter die clearance (18–20%), and premium coated tool-steel punches to prevent galling and edge rollover.
1050, 5052-H32, 5754, 6061-T6
Softer alloys (5052) provide outstanding punchability and progressive deep-draw formability. Polished tooling with specialized lubrication prevents aluminum adhesion on die cut faces.
SECC (Electrolytic), SGCC (Hot-Dip)
Economical choice for internal chassis partitions, equipment frames, and perforated air grills. Zinc coating provides cathodic protection on sheared hole perimeters without secondary plating.
T2 Pure Copper, C110, H62, H65 Brass
High electrical conductivity and excellent ductileness. Ideal for precision progressive stamped electrical contacts, connector pins, grounding clips, and conductive busbar plates.
For standard-sized parts with suitable material thicknesses, CNC-punched features can typically achieve dimensional tolerances starting from approximately ±0.1 mm. Large sheets, thick materials, dense hole patterns, high-strength alloys, and formed features may require wider tolerances. Critical dimensions, datums, and inspection requirements should be clearly identified on the 2D drawing.
| Feature | Typical Capability | Important Considerations |
|---|---|---|
|
Standard CNC-Punched Features
|
From ±0.1 mm |
Depends on base material alloy, sheet thickness, overall panel size, and tooling sharp condition. |
|
Hole & Slot Position
|
From ±0.1 mm |
Accumulated positional variation should be taken into account across large hole arrays or distant mounting centers. |
|
Repeated Perforations
|
Drawing Review Required |
Hole spacing, web width between holes, and post-punch material sheet flatness directly influence overall accuracy. |
|
Louvers, Embosses & Extrusions
|
Drawing Review Required |
Formed feature height, metal plastic flow, and material springback characteristics govern achievable tolerances. |
|
Custom Stamped Features
|
Tooling Review Required |
Achievable limits depend on stamping die architecture, press tonnage, raw material temper, and production quantity. |
TENGHUI manufactures custom punched and stamped metal components designed to provide reliable structural integration, ventilation, and protection across a wide range of products and industries.
Robust panels and enclosures featuring precision cutouts, mounting holes, and electrical knockouts for industrial control switchgear.
Precision stamped copper, brass, and alloy components engineered for high-conductivity electrical contact, grounding, and signal transfer.
Custom protective housings integrated with accurate slide-rail slot patterns, connector cutouts, and fastener mounting locations.
Sheet covers optimized with high-density repeated perforation patterns and formed louvers for efficient passive or forced airflow cooling.
Load-bearing structural frameworks and formed mounting brackets engineered for maximum rigidity and precise mechanical mating alignment.
Air handling elements, duct panels, and stamped louvered grilles designed for weather resistance and aerodynamic intake/exhaust distribution.
Operator safety enclosures and heavy-gauge access covers built with rugged structural profiles to withstand industrial factory environments.
Fully tailored stamped and CNC-punched parts combining specialized forming features (embosses, ribs, bridge lances) for unique applications.
CNC punching uses programmable positioning and interchangeable standard tooling, making it suitable for prototypes, changing designs, and lower quantities. Sheet metal stamping uses dedicated dies and is more economical for stable, repeat production runs.
CNC punching is generally more suitable for low-volume production because it utilizes programmable positioning and standard off-the-shelf tooling, eliminating expensive upfront die development costs and making design revisions fast and economical.
Stamping becomes more economical when product geometry is frozen and annual order volumes are high enough to amortize the cost of dedicated tooling. The break-even quantity depends on part complexity, die architecture, raw material, and required stroke rate.
Standard CNC-punched features can typically achieve dimensional tolerances starting from approximately ±0.1 mm. Actual achievable tolerances depend on the base material grade, sheet thickness, overall panel size, hole pattern density, and tool sharpness condition.
As a general DFM rule, the minimum hole diameter should be approximately equal to or greater than the sheet thickness (D ≥ T). For stainless steel and other high-strength alloys, minimum feature sizes may need to be larger to prevent premature punch tip breakage.
Yes. When suitable feature-specific in-turret tooling is configured, our CNC punch presses form louvers, electrical knockouts, card guides, embossments, and countersinks in a single setup. Feasibility depends on sheet thickness, form height, and spacing from adjacent features.
Mechanical shearing naturally creates a small burr on the die-exit side. Burr height depends on material hardness, die clearance, and punch edge sharpness. Critical burr direction and deburring requirements should be clearly indicated on your 2D manufacturing drawings.
Yes. Custom stamping operations typically require dedicated tool-steel punches and dies (such as single-stage, compound, or progressive dies). Tooling investment and fabrication lead times vary based on geometric complexity, material thickness, and anticipated production lifecycle.
Please submit a 3D CAD model (STEP, STP, or IGES) alongside a fully dimensioned 2D print (PDF, DXF, or DWG). Be sure to specify raw material alloy grade, thickness, order batch quantities, critical tolerances, burr orientation, and secondary surface finishing needs.
Cost drivers include raw material type and thickness, total number of punched hits per sheet, machine cycle time, sheet nesting efficiency, custom tooling requirements, production volume, and secondary deburring or finishing specifications.
If you have any questions or would like to book a session please contact us.
Once we receive your design files, our senior manufacturing engineers will manually perform a comprehensive DFM review and deliver an accurate, optimized quote within 24 hours.
