Lower Tool (Die): Opening Width (V-die) 4-200 mm

Component Specifications

Definition

The lower tool, commonly called a die, is a precision-engineered stationary component in metal plate bending machines that provides the forming surface against which the metal plate is pressed by the upper punch. It determines the final bend angle, radius, and geometry of the workpiece through controlled deformation.

Working Principle

Works on the principle of three-point bending: the metal plate is positioned over the die opening, and the upper punch applies force downward, causing the plate to bend into the die's V-shaped or U-shaped cavity. The die supports the plate at two points while the punch applies pressure at the center, creating precise plastic deformation.

Materials

Typically made from high-strength tool steels (e.g., AISI D2, AISI O1, or 42CrMo4) with hardness of 58-62 HRC, often hardened and tempered. For high-wear applications, carbide inserts or surface coatings like TiN or CrN may be applied.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	Standard 835 mm, custom up to 6000 mm
Die Angle	30°, 45°, 90° (standard)
Surface Finish	Ra ≤ 0.8 μm
Tonnage Rating	Up to 2000 tons
Shoulder Radius	0.5-20 mm
Opening Width (V Die)	4-200 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

ISO 9010, DIN 55202, ISO 12165

Parent Products

This component is used in the following industrial products

Metal Plate Bending Machine

A metal plate bending machine is a standalone industrial device used in metal fabrication shops to bend sheet metal and plates into precise angular shapes.

View Product Details

Engineering Analysis

Risks & Mitigation

Tool wear leading to dimensional inaccuracies
Improper alignment causing asymmetric bends
Overloading beyond tonnage rating causing tool fracture
Material springback affecting final angle

FMEA Triads

Trigger: Excessive tonnage or material thickness
Failure: Die fracture or permanent deformation
Mitigation: Adhere to machine tonnage limits and material specifications; use overload protection systems.

Trigger: Abrasive materials or high cycle counts
Failure: Wear on die shoulders affecting bend radius
Mitigation: Use hardened tool steels with wear-resistant coatings; implement regular inspection and maintenance schedules.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical dimensions, ±0.25° on bend angles per ISO 9010

Test Method

Coordinate measuring machine (CMM) verification, bend angle measurement with protractors or laser scanners, hardness testing per ISO 6508

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 Lower Tool (Die)

Manufacturer profiles associated with Lower Tool (Die).

Sourcing Lower Tool (Die) from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

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.

Shaft Bearing

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

Frequently Asked Questions

What is the difference between a V-die and a U-die?

V-dies create sharp bends with defined angles (typically 30°-90°), while U-dies produce rounded bends with larger radii, suitable for thicker materials or specific geometries.

How do I select the correct die opening width?

Die opening is typically 6-8 times the material thickness for mild steel. For example, a 3 mm plate requires an 18-24 mm V-opening. Consult machine manufacturer guidelines for specific materials.

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.

Lower Tool (Die)