Editorial Technical Reference

Case Positioning Fixture

This page explains how Case Positioning Fixture is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A specialized fixture designed to precisely hold and position a case or housing during assembly operations.

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Case Positioning Fixture in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Case Positioning Fixture

Definition
The Case Positioning Fixture is a critical component within the Primer Assembly and Insertion Module, responsible for securely clamping and accurately aligning a case or housing component to ensure proper orientation and location for subsequent assembly steps, such as primer insertion or component attachment. It provides the necessary stability and repeatability required for automated or manual assembly processes. The fixture typically employs mechanical clamps, pneumatic actuators, or servo-driven mechanisms to engage with specific features or surfaces of the case. It holds the case in a predefined, fixed position relative to the module's coordinate system, ensuring that the case's critical interfaces (e.g., openings for primers) are correctly presented to other tools or robots within the assembly station. Key parameters include clamping force (5–20 kN), positioning accuracy (±0.02 mm per ISO 230-2), repeatability (±0.01 mm per ISO 230-2), operating temperature (-10–60 °C), maximum load capacity (500–2000 kg), clamping stroke (10–50 mm), air supply pressure (0.4–0.8 MPa per ISO 8573-1), weight (50–150 kg), base plate dimensions (400×400–800×800 mm), material hardness (HRC 45–60 per ASTM E18), surface finish (Ra 0.8–1.6 μm per ISO 1302), and corrosion resistance (ISO 9227: 72 h). Materials on file include tool steel and aluminum alloy. These values are directory reference ranges and must be confirmed for the actual model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The fixture operates by engaging with the case's external features or surfaces using mechanical clamps, pneumatic actuators, or servo-driven mechanisms. It applies a controlled clamping force to hold the case securely, while precision alignment features ensure the case is positioned accurately relative to the module's coordinate system. This allows subsequent assembly tools to interact with the case's critical interfaces consistently. The fixture's design incorporates adjustable stops or guides to accommodate case size variations within the specified clamping stroke. The clamping force is regulated to prevent deformation or movement during machining or assembly, and the entire system is designed for repeatable positioning within tight tolerances.
Common Materials
Tool Steel, Aluminum Alloy
Technical Parameters
ParameterTypical rangeNotes & selection driver
Clamping Force5–20 kNRequired to prevent case movement during machining
Positioning Accuracy±0.02 mmEnsures consistent assembly alignmentISO 230-2
Repeatability±0.01 mmCritical for batch productionISO 230-2
Operating Temperature-10–60 °COutside range may affect seal integrity
Maximum Load Capacity500–2000 kgMust exceed workpiece weight with safety factor
Clamping Stroke10–50 mmAccommodates case size variations
Air Supply Pressure0.4–0.8 MPaBelow 0.4 MPa clamping force insufficientISO 8573-1
Weight50–150 kgAffects portability and installation
Base Plate Dimensions400×400–800×800 mmMust fit machine worktable
Material HardnessHRC 45–60 HRCEnsures wear resistanceASTM E18
Surface FinishRa 0.8–1.6 μmAffects corrosion resistance and frictionISO 1302
Corrosion ResistanceISO 9227: 72 hMinimum salt spray test durationISO 9227

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Base Plate Part
    Provides the foundational mounting surface and reference plane for the fixture.
    Material: steel
  • Clamping Arm
    Actuated arm that moves to engage and secure the case against locators.
    Material: steel
  • Locating Pin Part
    Precision pin that engages with a hole or feature on the case to define its position.
    Material: hardened steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (mechanical fixture, no fluid pressure)
other spec: Max Load Capacity: 50 kg, Positioning Accuracy: ±0.05 mm, Vibration Tolerance: <5 g RMS
temperature: -20°C to 80°C
Media Compatibility
✓ Aluminum Housings ✓ Plastic Enclosures ✓ Stamped Steel Cases
Unsuitable: High-corrosive chemical environments (e.g., acid baths)
Sizing Data Required
  • Case Dimensions (LxWxH)
  • Weight of Case/Assembly
  • Required Clamping Force

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear and misalignment
Cause: Repeated clamping cycles and abrasive particles causing dimensional inaccuracies and loss of positioning precision
Hydraulic/pneumatic system failure
Cause: Seal degradation, fluid contamination, or pressure loss leading to insufficient clamping force
Maintenance Indicators
  • Visible misalignment or workpiece slippage during operation
  • Unusual hissing sounds (pneumatic) or fluid leaks (hydraulic) from the fixture
Engineering Tips
  • Implement regular calibration checks and preventive cleaning to remove debris from clamping surfaces
  • Use filtered air/hydraulic fluid and monitor pressure gauges to maintain optimal system performance

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI B5.54 - Machine tool components - Workholding devices DIN 6325 - Cylindrical pins with internal thread

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Parallelism of mounting surfaces: 0.02mm
Quality Inspection
  • Coordinate Measuring Machine (CMM) dimensional verification
  • Surface roughness measurement per ISO 4287
Technical documentation
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Manufacturing capability
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Inspection readiness
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Manufacturers of Case Positioning Fixture

Manufacturer profiles associated with Case Positioning Fixture.

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Frequently Asked Questions

What is the primary function of a Case Positioning Fixture?

It securely clamps and accurately aligns a case or housing during assembly, ensuring proper orientation for subsequent operations like primer insertion.

What materials are commonly used for this fixture?

Tool steel and aluminum alloy are listed as materials on file, but confirm the specific material for your application with the supplier.

How is positioning accuracy verified?

Positioning accuracy is specified as ±0.02 mm per ISO 230-2. Verification should be performed using appropriate measurement methods and standards.

What is the recommended air supply pressure?

The air supply pressure range is 0.4–0.8 MPa per ISO 8573-1. Ensure your system provides this pressure for proper clamping force.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Primer Assembly and Insertion Module
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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