---
title: "Positioning Fixture"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:POSITIONING_FIXTURE"
  data_integrity_hash: "176455a2a0594564cbce9012b34e618a"
  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:POSITIONING_FIXTURE"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/positioning-fixture.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/positioning-fixture"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.02-0.05 mm positioning tolerance, 150-300 N clamping force, 20-80°C operating temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 100
    unit: "N"
    consequence: "Thermal expansion mismatch between fixture steel (α=12×10⁻⁶/°C) and aluminum frame components (α=23×10⁻⁶/°C) causing dimensional drift, hydraulic pressure loss below 5 MPa leading to insufficient clamping force"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination with 15 μm particles exceeding ISO 4406 18/16/13 cleanliness code"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10 μm absolute filtration with differential pressure monitoring at 0.3 MPa warning threshold"
  - node_2:
      trigger: "Cyclic loading at 0.5 Hz frequency exceeding 10⁷ cycles at 250 N amplitude"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement shot peening to induce 400 MPa compressive residual stress at critical weld locations"
bom_nodes:
  base-plate:
    type: "component"
    urn: "URN:CNFX:ME:BASE_PLATE"
    interface_type: "physical-logic-coupled"
  locating-pin:
    type: "component"
    urn: "URN:CNFX:ME:LOCATING_PIN"
    interface_type: "physical-logic-coupled"
  clamp-arm:
    type: "component"
    urn: "URN:CNFX:ME:CLAMP_ARM"
    interface_type: "physical-logic-coupled"
  support-block:
    type: "component"
    urn: "URN:CNFX:ME:SUPPORT_BLOCK"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "ANSI B5.54-2005 - METHODS FOR PERFORMANCE EVALUATION OF COMPUTER NUMERICALLY CONTROLLED MACHINING CENTERS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/positioning-fixture.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "2262f7dd0bdeb18df9f474382e93d4dddd2528da11e7e8b0c91ebe96bff1af90"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Positioning Fixture

## 1. Technical Definition
A specialized clamping device that precisely holds and positions trailer frame components during robotic welding operations.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.02-0.05 mm positioning tolerance, 150-300 N clamping force, 20-80°C operating temperature**. Failure boundary: **Clamping force drops below 100 N, positioning tolerance exceeds 0.1 mm, temperature exceeds 120°C**, Mechanism: **Thermal expansion mismatch between fixture steel (α=12×10⁻⁶/°C) and aluminum frame components (α=23×10⁻⁶/°C) causing dimensional drift, hydraulic pressure loss below 5 MPa leading to insufficient clamping force**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Hydraulic fluid contamination with 15 μm particles exceeding ISO 4406 18/16/13 cleanliness code | 8 | Spool valve sticking causing 40% reduction in clamping force | Install 10 μm absolute filtration with differential pressure monitoring at 0.3 MPa warning threshold |
| Cyclic loading at 0.5 Hz frequency exceeding 10⁷ cycles at 250 N amplitude | 8 | Fatigue crack initiation at fixture baseplate fillet welds (stress concentration factor Kt=2.8) | Implement shot peening to induce 400 MPa compressive residual stress at critical weld locations |

## 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**: **Robotic Welding System**, **CNC Plasma Cutter**, **Automated Material Handling System**  
**Downstream Applications**: Trailer Frame Assembly, Semi-Trailer Chassis, Commercial Vehicle Frame  

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

### Q: What makes this positioning fixture suitable for robotic welding operations?
**A**: This fixture features precise locating pins and clamp arms that securely hold trailer frame components in exact positions, ensuring consistent weld quality and repeatability in automated manufacturing environments.

### Q: How does the carbon steel and alloy steel construction benefit motor vehicle manufacturing?
**A**: Carbon steel provides excellent strength and durability for the base structure, while alloy steel components offer enhanced wear resistance and precision for clamping elements, ensuring long service life in demanding production settings.

### Q: What components are included in the BOM and how do they function together?
**A**: The BOM includes a base plate for stability, clamp arms for secure holding, locating pins for precise positioning, and support blocks for structural reinforcement. These components work together to create a rigid, repeatable fixturing system for trailer frame assembly.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- ANSI B5.54-2005 - METHODS FOR PERFORMANCE EVALUATION OF COMPUTER NUMERICALLY CONTROLLED MACHINING CENTERS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Positioning Fixture](https://cnfx.com/industry/motor-vehicle-manufacturing/product/positioning-fixture)**

### 🌐 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**: POSITIONING_FIXTURE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 37eec82f
