INDUSTRY COMPONENT

Upper Punch

Upper punch component for V-die sets in sheet metal bending operations

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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
  • 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
Standards
ISO 9001, DIN 8586, ISO 2768-m

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Upper Punch.

upper punch V-die punch bending punch sheet metal tooling press brake tooling metal forming components industrial punches Upper Punch in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.8 / 5.0 (14 reviews)

"The Upper Punch we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

"Found 14+ suppliers for Upper Punch on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Upper Punch is very thorough, especially regarding technical reliability."

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Upper Mold Plate Upper Tool (Punch)