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CNC Punching & Sheet Metal Stamping Services

TENGHUI provides precision CNC punching services and custom sheet metal stamping for prototypes, low-volume batches, and repeat production orders. We manufacture accurate holes, slots, perforations, cutouts, louvers, knockouts, and formed features with consistent dimensions and reliable part-to-part repeatability.

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Industrial Enclosures

CNC Punching and Metal Stamping Capabilities

Fabrication Punching & Stamping

Our CNC punching and sheet metal stamping capabilities support a wide range of custom panels, brackets, covers, chassis, enclosures, terminals, and other precision sheet metal parts.

Manufacturing Processes & Formed Features

01
CNC Punching Uses programmable positioning and interchangeable tooling to produce holes, slots, cutouts, and repeated patterns efficiently. It is well suited to prototypes, product variations, and low- to medium-volume production.
02
Custom Sheet Metal Stamping Uses dedicated punches and dies for blanking, piercing, and forming. It provides consistent dimensions, fast production cycles, and competitive unit costs for repeat medium- and high-volume orders.
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Punch-Formed Features: Specialized tooling can create louvers, knockouts, embosses, extrusions, and other formed features directly in the sheet. Available features are confirmed according to the material, thickness, geometry, and tooling requirements.

CNC Punching vs. Sheet Metal Stamping

CNC Punching vs. Sheet Metal Stamping

 
CNC punching and metal stamping both use punches and dies, but they serve different production requirements. Our engineers review your production quantity, geometry, tolerance requirements, and tooling budget to determine the most suitable process.
 
ProcessBest Suited ForTooling RequirementsMain Advantages
CNC PunchingPrototypes and low- to medium-volume ordersInterchangeable standard or special toolsFlexible programming, lower initial tooling costs, and easier design changes
Sheet Metal StampingRepeat medium- and high-volume productionDedicated stamping diesFaster production, consistent parts, and lower unit costs at volume
Punch FormingLouvers, knockouts, embosses, and extrusionsFeature-specific forming toolsProduces cut and formed features directly in the sheet

Custom Punched and Stamped Features

Capabilities Punched & Stamped Features

Advanced tooling configurations allow for a wide range of functional geometries to be integrated directly into sheet metal components, optimizing structural integrity and assembly performance.

Precision Geometries & Formed Elements

01
Holes and Slots Round, square, rectangular, oblong, and custom-shaped holes and slots can be produced with consistent dimensions and positioning.
02
Perforated Metal Patterns Repeated ventilation holes, grids, and perforated patterns can be punched efficiently in panels, covers, screens, and enclosure components.
03
Louvers Formed louvers provide airflow and ventilation for electrical cabinets, equipment enclosures, HVAC components, and protective covers.
04
Knockouts Electrical knockouts create removable cable-entry features in control panels, junction boxes, cabinets, and other electrical enclosures.
05
Embosses Raised or recessed embosses can increase panel stiffness, provide clearance, create locating features, or add identification marks.
06
Extruded Holes Extruded holes increase the available material thickness around an opening, providing additional engagement for tapping or mechanical fastening.

Materials for CNC Punching and Sheet Metal Stamping

Materials Suitability & Grades

Material suitability depends on grade, temper, thickness, hardness, feature geometry, and required tolerances. Not every material grade is suitable for every formed feature. Final feasibility is confirmed after reviewing the material condition and technical drawings.

Material Available Grades Punching and Stamping Considerations
Aluminum 1050 1060 5052 5754 5083 6061 6063 7075 Softer grades provide better punchability and formability. High-strength grades require individual review.
Stainless Steel SUS301 SUS304 SUS316 Requires suitable tool clearance and greater punching force due to strength and work hardening.
Cold-Rolled & Hot-Rolled Steel SPCC SPHC DC01 DC05 Q235 Q355 Widely used for panels, brackets, covers, frames, and structural stamped components.
Galvanized Steel SECC SGCC Tooling and handling must account for the zinc coating and required surface appearance.
Copper and Brass T2 H62 H65 Suitable for electrical terminals, contacts, conductive plates, and decorative components.
Titanium TC4 Available for selected projects; punching and forming feasibility require individual engineering review.
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Material Feasibility Notice: Final feasibility is confirmed after reviewing the material condition and technical drawings.

CNC Punching Accuracy and Tolerances

Precision & Quality

CNC Punching Accuracy and Tolerances

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 material, thickness, sheet size, and tooling condition
Hole and Slot Position From ±0.1 mm Accumulated variation should be considered across large patterns
Repeated Perforations Drawing review required Hole spacing and material flatness may affect accuracy
Louvers, Embosses and Extrusions Drawing review required Form height, material flow, and springback affect dimensions
Custom Stamped Features Tooling review required Depends on die design, material condition, and production quantity

Design Guidelines for Punched Sheet Metal Parts

Design Guidelines Punched Sheet Metal

Following strict DFM rules for minimum hole sizes, spacing, edge distances, and burr directions ensures structural integrity and dimensional accuracy in punched sheet metal parts.

01
Minimum Hole and Slot Size
As an initial guideline, the minimum punched hole diameter or slot width should be approximately equal to or greater than the material thickness. Harder materials may require larger minimum features.
02
Hole-to-Hole Spacing
Maintain approximately 2 times the material thickness between adjacent holes to reduce web distortion during the punching process.
03
Hole-to-Edge Distance
Maintain approximately 2 times the material thickness between a punched hole and the sheet edge to reduce edge deformation and secure structural strength.
04
Formed Feature Spacing
Formed features should be positioned at least 3 times the material thickness from the sheet edge and approximately 6 times the material thickness from adjacent formed features.
05
Burr Direction
Punching produces rollover on the entry side and a small burr on the die-exit side. Specify the required burr direction when it affects appearance, handling, or assembly.
06
Material and Tool Clearance
Punch-and-die clearance must match the material and thickness. Incorrect clearance increases burr height, punching force, tool wear, and dimensional variation.
Note
DFM Initial Guidelines
These values are initial DFM guidelines rather than universal limits. Final feature spacing is determined by the material, thickness, tooling, and geometry.

Applications of CNC-Punched and Stamped Parts

Applications Punched & Stamped Parts

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.

01

Electrical Cabinets & Control Panels

Robust panels and enclosures featuring precision cutouts, mounting holes, and electrical knockouts.

02

Electronic Chassis & Equipment Enclosures

Custom protective housings integrated with accurate slot patterns and fastener mounting locations.

03

Ventilation Panels & Perforated Covers

Components optimized with repeated perforation patterns and louvers for efficient thermal management.

04

Mounting Brackets & Structural Supports

Load-bearing frameworks and formed brackets engineered for stability and precise mechanical alignment.

05

HVAC Panels & Air-Management Components

Air handling elements and louvered panels designed for optimal airflow and weather resistance.

06

Electrical Terminals & Conductive Parts

Precision stamped copper, brass, and alloy components for electrical contact and signal transfer.

07

Machinery Guards & Protective Covers

Safety enclosures built with rugged structural profiles to withstand heavy mechanical operations.

08

Custom Industrial Sheet Metal Components

Fully tailored stamped and punched parts combining specialized forming features for unique applications.

Our CNC Punching and Stamping Process

Workflow Punching & Stamping Process

Our systematic manufacturing workflow ensures rigorous engineering review, precise tooling preparation, and strict quality control from initial drawing analysis to final production.

Step-by-Step Production Sequence

01
Drawing and Quantity Review We review the material, thickness, dimensions, tolerances, feature geometry, order quantity, and cosmetic requirements.
02
Process Selection Our engineers determine whether CNC punching, custom stamping, or feature-specific forming tooling is the most economical manufacturing method.
03
Programming and Tool Preparation CNC toolpaths and sheet layouts are prepared, or dedicated punches and dies are developed for the approved design.
04
First-Article Inspection Initial parts are produced and inspected to verify dimensions, feature positions, forming quality, and surface condition.
05
Repeat Production After first-article verification, production continues under controlled tooling and inspection procedures.

CNC Punching & Sheet Metal Stamping FAQs

1. What is the difference between CNC punching and sheet metal stamping?

CNC punching uses programmable positioning and interchangeable 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.

2. Which process is better for low-volume sheet metal parts?

CNC punching is generally more suitable for low-volume production because it uses programmable positioning and standard tooling, reducing initial tooling costs and making design changes easier.

3. When does custom metal stamping become more cost-effective?

Stamping becomes more economical when the design is stable and the production quantity is high enough to offset the cost of dedicated tooling. The break-even quantity depends on part complexity, tooling cost, material, and production rate.

4. What tolerances can CNC punching achieve?

Standard CNC-punched features can typically achieve tolerances starting from approximately ±0.1 mm. Actual tolerances depend on the material, thickness, part size, feature pattern, and tool condition.

5. What is the minimum punched hole size?

As a general guideline, the minimum hole diameter should be approximately equal to or greater than the material thickness. Stainless steel and other high-strength materials may require larger features.

6. Can CNC punching create louvers, knockouts, and embosses?

Yes, when suitable feature-specific tooling is available. Feasibility depends on material type, thickness, dimensions, form direction, and spacing from adjacent features.

7. Will CNC-punched parts have burrs?

Punching naturally creates a small burr on the die-exit side. Burr height depends on the material, tool clearance, and tooling condition. Required burr direction should be specified on the drawing.

8. Does sheet metal stamping require custom tooling?

Yes. Custom stamping normally requires dedicated punches and dies. Tooling cost and lead time depend on part complexity, tolerances, material, and expected production quantity.

9. What files are required for a quotation?

Provide a STEP or STP model together with a dimensioned PDF, DXF, or DWG drawing. Specify the material, thickness, quantity, tolerances, critical features, burr direction, and cosmetic requirements.

10. What affects CNC punching and stamping costs?

Cost depends on material, thickness, number of punched features, machine hits, tooling requirements, order quantity, material utilization, tolerances, and inspection requirements.

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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.