Mandrel Assembly: Mandrel Diameter 0.5-200 mm

Component Specifications

Definition

A mandrel assembly is a critical component in industrial tube bending machines, consisting of a rigid mandrel rod, support balls or segments, and mounting hardware. It is inserted into the tube interior during bending to maintain cross-sectional shape, prevent wrinkling, ovalization, or collapse, and ensure precise bend geometry with minimal wall thinning.

Working Principle

The mandrel assembly works by providing internal support to the tube wall during the bending process. As the bending die applies force, the mandrel's rigid structure counteracts compressive forces on the inner radius and tensile forces on the outer radius, distributing stress evenly to maintain tube integrity and dimensional accuracy.

Materials

Typically made from hardened tool steel (e.g., AISI D2, H13), stainless steel, or carbide for wear resistance. Support balls may use bronze or polymer coatings to reduce friction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	Custom to tube length
Mandrel Diameter	0.5-200 mm
Surface Hardness	58-62 HRC
Ball/Segment Count	3-10
Operating Temperature	-20°C to 200°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 12163, DIN 2448

Parent Products

This component is used in the following industrial products

Industrial Tube Bending Machine

An industrial tube bending machine is a CNC-controlled device designed to precisely bend metal tubes and pipes to specific angles and radii.

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Engineering Analysis

Risks & Mitigation

Mandrel wear leading to tube defects
Improper alignment causing scratches or jamming
Material incompatibility with tube coating

FMEA Triads

Trigger: Abrasive tube materials or lack of lubrication
Failure: Excessive mandrel wear, reduced support, tube collapse
Mitigation: Use hardened materials, apply lubricants, implement regular inspection schedules

Trigger: Misalignment during setup
Failure: Tube scratching, uneven bending, machine damage
Mitigation: Follow calibration procedures, use alignment tools, train operators

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm on diameter, ±0.1 mm on straightness

Test Method

Dimensional inspection with micrometers, bend testing with sample tubes, wear analysis via surface roughness measurement

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

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Manufacturers of Mandrel Assembly

Manufacturer profiles associated with Mandrel Assembly.

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Frequently Asked Questions

What is the purpose of a mandrel assembly in tube bending?

It prevents tube deformation (collapse, wrinkling) during bending by providing internal support, ensuring precise bend geometry and wall integrity.

How do I select the right mandrel assembly for my application?

Consider tube material, diameter, wall thickness, bend radius, and required precision. Match mandrel diameter closely to tube ID, and choose ball count based on bend severity.

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 Assembly