Upper Punch: Width 20-100 mm, Working Length 50-300 mm

Component Specifications

Definition

The upper punch is a precision tooling component in V-die sets used for sheet metal bending operations. It is mounted on the press ram and descends to force sheet metal into the V-shaped lower die, creating controlled bends with specific angles and radii. This component directly contacts the workpiece and determines the bend geometry through its tip profile and dimensional accuracy.

Working Principle

The upper punch applies downward force to sheet metal positioned over a V-shaped lower die. As the press ram descends, the punch tip contacts the sheet metal and pushes it into the die opening, causing plastic deformation along a predetermined bend line. The V-angle of the die and punch geometry determine the final bend angle, while the punch radius controls the inside bend radius of the formed part.

Materials

Tool steel (typically D2, A2, or M2 grades), hardened to 58-62 HRC with surface treatments like nitriding or chrome plating for wear resistance

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	20-100 mm
Height	40-150 mm
Hardness	58-62 HRC
Tip Radius	0.5-12.7 mm
Mounting Type	T-slot or bolt-on
Surface Finish	Ra 0.4 μm max
Working Length	50-300 mm

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

Standards

DIN 8586, ISO 2768-m

Parent Products

This component is used in the following industrial products

V-Die Set

A specialized tooling assembly used in press brakes to create precise V-shaped bends in metal sheets.

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Engineering Analysis

Risks & Mitigation

Tool wear leading to dimensional inaccuracies
Improper alignment causing sheet metal marking
Fatigue failure from cyclic loading
Incompatible material causing galling or adhesion

FMEA Triads

Trigger: Insufficient hardness or improper heat treatment
Failure: Premature wear and radius deformation
Mitigation: Implement material certification and hardness testing protocols

Trigger: Misalignment with lower die
Failure: Asymmetric bending and sheet metal marking
Mitigation: Use precision alignment tools and regular calibration checks

Trigger: Excessive tonnage or off-center loading
Failure: Cracking or catastrophic failure
Mitigation: Implement press force monitoring and proper tool selection guidelines

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.025 mm on critical dimensions, ±0.1° on angular features

Test Method

CMM verification, surface roughness testing, hardness testing per ASTM E18

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 Upper Punch

Manufacturer profiles associated with Upper Punch.

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Related Components

Mounting Interface

Precision mounting interface connecting punch tips to pharmaceutical tablet press machines for accurate tablet production.

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

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.

Main Frame

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.

Frequently Asked Questions

What is the difference between standard and custom upper punches?

Standard punches follow common industry dimensions and radii for general applications, while custom punches are engineered for specific bend geometries, specialized materials, or unique production requirements with non-standard angles or profiles.

How often should upper punches be inspected for wear?

Inspect upper punches every 8,000-10,000 cycles in normal production environments. High-volume operations or abrasive materials may require inspection every 5,000 cycles. Key wear indicators include radius deformation, surface scoring, and dimensional changes exceeding 0.05 mm.

Can upper punches be reground or reconditioned?

Yes, qualified punches can be reground to restore the original radius profile and surface finish, typically allowing 2-3 regrinds before replacement. This requires precision grinding equipment and heat treatment expertise to maintain hardness specifications.

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.

Upper Punch