Industry-Verified Manufacturing Data (2026)

Lower Blade

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Lower Blade used in the Fabricated Metal Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Lower Blade is characterized by the integration of Cutting Edge and Blade Body. In industrial production environments, manufacturers listed on CNFX commonly emphasize Tool steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The stationary cutting blade in a sheet metal guillotine shear that works in conjunction with the upper blade to shear metal sheets.

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Product Specifications

Technical details and manufacturing context for Lower Blade

Definition
The lower blade is a critical component of sheet metal guillotine shears, serving as the fixed cutting edge against which the movable upper blade presses to perform clean, straight cuts through metal sheets. It is precisely mounted on the shear's bed or frame and remains stationary during operation, providing the counter-force necessary for the shearing action.
Working Principle
The lower blade remains fixed while the upper blade descends with significant force. The metal sheet is placed between them. As the upper blade presses down, the material is forced against the sharp edge of the lower blade, creating a shearing action that cleanly separates the metal along the cutting line through plastic deformation and fracture.
Common Materials
Tool steel, High-carbon steel, Alloy steel
Technical Parameters
  • Length of the cutting edge, typically matching or exceeding the maximum cutting width capacity of the shear machine (mm) Standard Spec
Components / BOM
  • Cutting Edge
    Primary shearing surface that contacts and cuts the metal
  • Blade Body
    Main structural support that holds the cutting edge and mounts to the shear bed
  • Mounting Holes
    Precision holes for securing the blade to the shear machine with bolts
  • Wear Surface
    Area that contacts the upper blade during shearing, designed for durability
Engineering Reasoning
0.5-3.0 mm blade clearance from upper blade, 200-800 MPa shear stress during cutting
Blade edge radius exceeding 0.05 mm, clearance deviation beyond ±0.1 mm from set value, shear stress exceeding 1200 MPa
Design Rationale: Edge dulling through abrasive wear (Archard's wear equation: V = K·W·L/H, where K=3×10⁻⁶ for tool steel), fatigue crack propagation at stress concentrations exceeding fracture toughness K_IC=60 MPa·√m
Risk Mitigation (FMEA)
Trigger Work hardening of sheet metal exceeding Rockwell C 45 hardness
Mode: Premature edge chipping and micro-fracture formation
Strategy: Integrated hardness sensor with automatic blade clearance adjustment system
Trigger Thermal expansion mismatch between blade (α=11×10⁻⁶/°C) and holder (α=23×10⁻⁶/°C)
Mode: Blade warping exceeding 0.02 mm flatness deviation
Strategy: Bimetallic compensation design with Invar interlayer (α=1.2×10⁻⁶/°C)

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lower Blade.

guillotine shear lower blade replacement sheet metal cutting stationary blade tool steel lower blade for metal shear high-carbon steel guillotine blade alloy steel fabricated metal product blade

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Sheet Metal Guillotine Shear
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Scrap Cutter
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (stationary component, experiences shear force, not fluid pressure)
other spec: Max shear force: Dependent on blade material and thickness; Typical blade hardness: 58-62 HRC for standard carbon steel blades
temperature: Ambient to 150°C (302°F) for continuous operation, short-term peaks to 200°C (392°F)
Media Compatibility
✓ Mild steel sheets (up to 6mm thickness) ✓ Stainless steel sheets (up to 3mm thickness) ✓ Aluminum sheets (up to 8mm thickness)
Unsuitable: Abrasive composite materials (e.g., fiberglass-reinforced plastics) due to accelerated blade wear
Sizing Data Required
  • Sheet metal thickness (mm/inches)
  • Sheet metal tensile strength (MPa/psi)
  • Required cutting length (mm/inches) of the blade

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Fatigue cracking
Cause: Cyclic loading from operational stresses leading to crack initiation and propagation, often exacerbated by material defects or improper heat treatment.
Abrasive wear
Cause: Contact with hard particles in the processed material causing gradual material loss, typically due to inadequate material hardness or contaminated feedstock.
Maintenance Indicators
  • Unusual vibration or audible knocking during operation
  • Visible cracks, chips, or excessive wear on the cutting edge
Engineering Tips
  • Implement regular non-destructive testing (e.g., dye penetrant or ultrasonic) to detect subsurface defects before catastrophic failure
  • Optimize blade material selection and apply wear-resistant coatings (e.g., tungsten carbide) based on specific application requirements

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality management systems ANSI B94.55M - Specifications for cutting tools DIN 1838 - Tolerances for cutting tools
Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Blade flatness: 0.05mm
Quality Inspection
  • Dimensional verification with CMM
  • Hardness testing (Rockwell C scale)

Factories Producing Lower Blade

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

T Technical Director from Australia Feb 19, 2026
★★★★★
"The technical documentation for this Lower Blade is very thorough, especially regarding technical reliability."
Technical Specifications Verified
P Project Engineer from Singapore Feb 16, 2026
★★★★☆
"Reliable performance in harsh Fabricated Metal Product Manufacturing environments. No issues with the Lower Blade so far. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Germany Feb 13, 2026
★★★★★
"Testing the Lower Blade now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

5 sourcing managers are analyzing this specification now. Last inquiry for Lower Blade from Poland (1h ago).

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Frequently Asked Questions

What materials are best for a lower blade in metal fabrication?

Tool steel, high-carbon steel, and alloy steel are optimal for lower blades due to their hardness, wear resistance, and ability to maintain a sharp cutting edge under repetitive shearing forces in fabricated metal product manufacturing.

How does the lower blade work with the upper blade in a guillotine shear?

The stationary lower blade provides a fixed cutting edge against which the moving upper blade presses to shear metal sheets. This scissor-like action ensures clean, precise cuts with minimal burring or deformation.

What are the key components of a lower blade's BOM?

The bill of materials typically includes the blade body for structural support, the cutting edge for shearing, mounting holes for secure installation, and wear surfaces designed to withstand abrasion from metal sheets during operation.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Fabricated Metal Product Manufacturing sector.

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