Punch: Length Range 25-300 mm, Diameter Range 0.5-200 mm

Component Specifications

Definition

A punch is a hardened, precision-machined component in a forming die set that serves as the male counterpart to a die. It applies controlled force to sheet metal or other materials to perform operations such as blanking, piercing, forming, or drawing. The punch typically moves vertically within a press to engage with the stationary die, creating the desired shape or hole through mechanical deformation or shearing action.

Working Principle

The punch operates on the principle of applying concentrated mechanical force to deform or shear material. When mounted in a press, it descends into the die cavity, forcing the workpiece material to flow, fracture, or conform to the die shape. The clearance between punch and die edges determines whether the operation is shearing (cutting) or forming (shaping without cutting).

Materials

Tool steel (D2, A2, M2), carbide (tungsten carbide), high-speed steel (HSS), or powder metallurgy steels. Hardness typically 58-65 HRC for steel punches, 85-92 HRA for carbide.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.01 mm to ±0.05 mm
Shank Type	Straight, shouldered, or ball-lock
Length Range	25-300 mm
Diameter Range	0.5-200 mm
Point Geometry	Flat, conical, bullet-nose, or shaped
Surface Finish	Ra 0.4-0.8 μm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8020, DIN 9861, JIS B 5012

Parent Products

This component is used in the following industrial products

Forming Die Set

A precision tool assembly used in metal forming processes to shape sheet metal into specific geometries through pressing operations.

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Precision Tooling (Die & Punch)

Specialized tooling components used for cutting, forming, or shaping materials in precision pressing operations

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Engineering Analysis

Risks & Mitigation

Tool breakage causing production downtime
Material springback affecting dimensional accuracy
Punch wear leading to burr formation
Misalignment causing shearing instead of forming
Fatigue failure from cyclic loading

FMEA Triads

Trigger: Excessive clearance between punch and die
Failure: Burr formation, poor edge quality, increased wear
Mitigation: Maintain proper clearance (typically 5-10% of material thickness), regular dimensional inspection

Trigger: Material hardness variation
Failure: Punch chipping or premature wear
Mitigation: Verify material specifications, use appropriate punch material (carbide for harder materials)

Trigger: Improper lubrication
Failure: Gallling, material adhesion, increased friction
Mitigation: Apply appropriate lubricant for material type, ensure consistent application

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, ISO 8015 for geometrical tolerancing

Test Method

Dimensional verification with CMM, hardness testing per ISO 6508, surface roughness measurement per ISO 4287

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Punch

Manufacturer profiles associated with Punch.

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Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

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The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

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Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between a blanking punch and a piercing punch?

A blanking punch cuts the entire perimeter of a part from sheet metal, producing the desired component. A piercing punch creates holes within a part without cutting the outer perimeter. The clearance and edge preparation differ between these applications.

How often should punches be inspected and maintained?

Punches should be visually inspected every shift for wear or damage. Dimensional checks should be performed weekly or every 10,000 cycles. Regular maintenance includes cleaning, lubrication, and edge condition verification to prevent premature failure.

What causes punch breakage in forming operations?

Common causes include excessive clearance between punch and die, misalignment, material hardness variations, inadequate lubrication, fatigue from cyclic loading, and improper punch material selection for the application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Punch