---
title: "Lower Blade"
industry: "Fabricated Metal Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:LOWER_BLADE"
  data_integrity_hash: "6512920f0657625fc443a36de7b748e1"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:LOWER_BLADE"
  data_source_uri: "https://cnfx.com/llms/industry/fabricated-metal-product-manufacturing/product/lower-blade.md"
  official_resource_url: "https://cnfx.com/industry/fabricated-metal-product-manufacturing/product/lower-blade"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-3.0 mm blade clearance from upper blade, 200-800 MPa shear stress during cutting"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 0.05
    unit: "mm"
    consequence: "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"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Work hardening of sheet metal exceeding Rockwell C 45 hardness"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated hardness sensor with automatic blade clearance adjustment system"
  - node_2:
      trigger: "Thermal expansion mismatch between blade (α=11×10⁻⁶/°C) and holder (α=23×10⁻⁶/°C)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Bimetallic compensation design with Invar interlayer (α=1.2×10⁻⁶/°C)"
bom_nodes:
  cutting-edge:
    type: "component"
    urn: "URN:CNFX:ME:CUTTING_EDGE"
    interface_type: "physical-logic-coupled"
  blade-body:
    type: "component"
    urn: "URN:CNFX:ME:BLADE_BODY"
    interface_type: "physical-logic-coupled"
  mounting-holes:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_HOLES"
    interface_type: "physical-logic-coupled"
  wear-surface:
    type: "component"
    urn: "URN:CNFX:ME:WEAR_SURFACE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/fabricated-metal-product-manufacturing/product/lower-blade.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "904b6bc9eddc05ae63a45f8d021d904a425a8ed06ecadfb94220c2ef8eb08874"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Lower Blade

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-3.0 mm blade clearance from upper blade, 200-800 MPa shear stress during cutting**. Failure boundary: **Blade edge radius exceeding 0.05 mm, clearance deviation beyond ±0.1 mm from set value, shear stress exceeding 1200 MPa**, Mechanism: **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**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Work hardening of sheet metal exceeding Rockwell C 45 hardness | 8 | Premature edge chipping and micro-fracture formation | Integrated hardness sensor with automatic blade clearance adjustment system |
| Thermal expansion mismatch between blade (α=11×10⁻⁶/°C) and holder (α=23×10⁻⁶/°C) | 8 | Blade warping exceeding 0.02 mm flatness deviation | Bimetallic compensation design with Invar interlayer (α=1.2×10⁻⁶/°C) |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Sheet Metal Guillotine Shear**, **Material Handling Crane**, **Hydraulic Power Unit**  
**Downstream Applications**: Metal Cabinet Panels, Ductwork Sections, Structural Brackets  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are best for a lower blade in metal fabrication?
**A**: 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.

### Q: How does the lower blade work with the upper blade in a guillotine shear?
**A**: 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.

### Q: What are the key components of a lower blade's BOM?
**A**: 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.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Lower Blade](https://cnfx.com/industry/fabricated-metal-product-manufacturing/product/lower-blade)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: LOWER_BLADE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 3b4b5626
