---
title: "Expanding Mandrel"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:EXPANDING_MANDREL"
  data_integrity_hash: "0157ba44474eacedea75ce1854942f0f"
  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:EXPANDING_MANDREL"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/expanding-mandrel.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/expanding-mandrel"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.0 MPa hydraulic pressure, 150-600 mm diameter expansion range, 0.1-0.3 mm radial expansion per segment"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "MPa"
    consequence: "Plastic deformation of expansion segments due to cyclic loading exceeding material fatigue limit (S-N curve at 10^6 cycles: 300 MPa for steel), hydraulic fluid contamination causing seal abrasion (particle size &gt;15 μm)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination with ISO 4406 Class 21/19/16 particles"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10 μm absolute filtration with differential pressure monitoring at 0.15 MPa"
  - node_2:
      trigger: "Coil centering misalignment exceeding 3 mm radial offset"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement laser alignment system with 0.1 mm precision and automatic coil centering mechanism"
bom_nodes:
  central-shaft:
    type: "component"
    urn: "URN:CNFX:ME:CENTRAL_SHAFT"
    interface_type: "physical-logic-coupled"
  expansion-segmentsshoes:
    type: "component"
    urn: "URN:CNFX:ME:EXPANSION_SEGMENTSSHOES"
    interface_type: "physical-logic-coupled"
  actuation-mechanism:
    type: "part"
    urn: "URN:CNFX:ME:ACTUATION_MECHANISM"
    interface_type: "physical-logic-coupled"
  wear-padsliners:
    type: "component"
    urn: "URN:CNFX:ME:WEAR_PADSLINERS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 286-2:2010 (LIMITS AND FITS)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 5480-1:2006 (SPLINED CONNECTIONS WITH INVOLUTE SPLINES BASED ON REFERENCE DIAMETERS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/expanding-mandrel.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "a4ab47f2da5c8ba0ab0cd4fbd7a8347ad3d569d0a5348bffe80394e5032d7b5e"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Expanding Mandrel

## 1. Technical Definition
A mechanical component within a decoiler/uncoiler that expands to grip the inner diameter of a coil, providing the driving force to unwind material.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.0 MPa hydraulic pressure, 150-600 mm diameter expansion range, 0.1-0.3 mm radial expansion per segment**. Failure boundary: **Material yield strength exceeded at 450 MPa stress, hydraulic seal failure at 2.5 MPa pressure, segment deformation beyond 0.5 mm permanent set**, Mechanism: **Plastic deformation of expansion segments due to cyclic loading exceeding material fatigue limit (S-N curve at 10^6 cycles: 300 MPa for steel), hydraulic fluid contamination causing seal abrasion (particle size &gt;15 μm)**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Hydraulic fluid contamination with ISO 4406 Class 21/19/16 particles | 8 | Seal extrusion and leakage causing pressure loss below 0.3 MPa | Install 10 μm absolute filtration with differential pressure monitoring at 0.15 MPa |
| Coil centering misalignment exceeding 3 mm radial offset | 8 | Asymmetric loading causing segment bending stress concentration at 550 MPa | Implement laser alignment system with 0.1 mm precision and automatic coil centering mechanism |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Actuation Mechanism](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/actuation-mechanism.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Coil Car**, **Straightener**, **Shear or Cut-to-Length Line**  
**Downstream Applications**: Sheet Metal Panels, Automotive Body Parts, Appliance Housings  

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

### Q: What materials are used in expanding mandrels for durability?
**A**: Our expanding mandrels are constructed from alloy steel for structural strength and hardened tool steel for wear-resistant components like expansion segments and wear pads, ensuring long service life in demanding manufacturing environments.

### Q: How does an expanding mandrel work in a decoiler/uncoiler system?
**A**: The expanding mandrel's actuation mechanism expands the segments/shoes against the coil's inner diameter, creating a secure grip that provides the driving force to unwind material smoothly and consistently during manufacturing processes.

### Q: What maintenance do expanding mandrels require?
**A**: Regular inspection of wear pads/liners and expansion segments is recommended, as these components experience friction during operation. Proper lubrication of the actuation mechanism and central shaft also helps maintain optimal performance and longevity.

## 6. Manufacturing Compliance
- ISO 286-2:2010 (LIMITS AND FITS)
- DIN 5480-1:2006 (SPLINED CONNECTIONS WITH INVOLUTE SPLINES BASED ON REFERENCE DIAMETERS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Expanding Mandrel](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/expanding-mandrel)**

### 🌐 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**: EXPANDING_MANDREL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 1bb60dd3
