Mandrel: Diameter Tolerance ±0.01 mm, Hardness 45-62 HRC

Component Specifications

Definition

A mandrel is a precision-engineered cylindrical component that forms the internal surface of hollow profiles during extrusion through an annular die. It maintains dimensional accuracy, controls wall thickness uniformity, and provides structural support to prevent collapse of the material being extruded. In annular die systems, the mandrel is typically mounted concentrically within the die body, creating the annular gap through which material flows to form pipes, tubes, or other hollow cross-sections.

Working Principle

The mandrel works by creating a fixed internal boundary within the annular die gap. As molten material (plastic, rubber, or metal) is forced through the die under pressure, it flows around the mandrel, taking the shape of the annular space between the mandrel's outer surface and the die's inner surface. The mandrel's precise geometry determines the internal dimensions and surface finish of the extruded product while providing thermal management and preventing material sagging or deformation.

Materials

Tool steel (H13, D2), carbide alloys, nitrided steels, or ceramic-coated metals for high-wear applications; selected based on extrusion material, temperature, and production volume requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	45-62 HRC
Concentricity	0.005 mm TIR
Surface Finish	Ra 0.2-0.4 μm
Diameter Tolerance	±0.01 mm
Thermal Conductivity	15-40 W/m·K
Max Operating Temperature	400°C

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

Standards

ISO 9001, DIN 16780, ASTM D5422

Parent Products

This component is used in the following industrial products

Annular Die

A critical component in plastic film blowing machines that shapes molten plastic into a continuous tubular film.

View Product Details

Downcoiler

A critical component in hot strip rolling mills that winds the finished steel strip into coils for storage and transport.

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Engineering Analysis

Risks & Mitigation

Thermal expansion causing dimensional inaccuracies
Material buildup leading to flow restrictions
Wear from abrasive compounds reducing lifespan
Improper alignment causing wall thickness variations

FMEA Triads

Trigger: Insufficient cooling or excessive extrusion temperatures
Failure: Thermal deformation altering mandrel dimensions
Mitigation: Implement temperature monitoring systems and use materials with higher thermal stability

Trigger: Abrasive additives in extrusion compounds
Failure: Premature wear and surface degradation
Mitigation: Apply wear-resistant coatings and establish regular inspection intervals

Trigger: Improper installation or alignment
Failure: Eccentric extrusion and inconsistent wall thickness
Mitigation: Use precision alignment tools and implement installation verification procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, ISO 8015 for geometrical tolerancing

Test Method

Coordinate measuring machine (CMM) verification, surface roughness testing per ISO 4287, hardness testing per ISO 6508

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Mandrel

Manufacturer profiles associated with Mandrel.

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Frequently Asked Questions

What is the primary function of a mandrel in annular die extrusion?

The mandrel creates and maintains the internal dimensions of hollow extruded products, ensuring consistent wall thickness and preventing collapse during material flow.

How does mandrel design affect extrusion quality?

Mandrel geometry, surface finish, and thermal properties directly impact product dimensional accuracy, surface quality, and production speed through controlled material flow and cooling.

What materials are commonly used for manufacturing mandrels?

Tool steels like H13 are standard for durability; carbide or ceramic coatings are added for abrasive materials or high-temperature applications to extend service life.

Data Basis

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

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.

Mandrel