Backer Plate: Thickness Range 25-150 mm, Hardness 48-52 HRC

Component Specifications

Definition

The backer plate is a critical structural element in extrusion die assemblies, positioned behind the die plate to absorb and distribute hydraulic pressure during extrusion processes. It ensures dimensional stability of the die opening, prevents deflection under high pressure (typically 100-500 bar), and maintains consistent material flow for producing precise cross-sectional profiles in continuous extrusion operations.

Working Principle

The backer plate functions as a pressure-bearing support structure that transfers extrusion forces from the die plate to the die body. It maintains the geometric integrity of the die opening by preventing elastic deformation under pressure, ensuring uniform material flow distribution across the die face. The plate's thickness and material properties are engineered to withstand cyclic loading while minimizing thermal expansion effects during temperature variations in the extrusion process.

Materials

High-strength tool steels (AISI H13, D2, or equivalent), heat-treated to 48-52 HRC for wear resistance. Alternative materials include hardened stainless steels (420SS) for corrosive environments or beryllium-copper alloys for specialized thermal applications. Surface finishes typically range from 0.4-1.6 μm Ra.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	48-52 HRC
Pressure Rating	Up to 500 bar
Thickness Range	25-150 mm
Flatness Tolerance	≤0.02 mm/m
Thermal Conductivity	24-42 W/m·K
Maximum Operating Temperature	350°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 12164, DIN 16742

Parent Products

This component is used in the following industrial products

Extrusion Die

A precision tool that shapes molten aluminum into specific cross-sectional profiles during extrusion.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking from cyclic pressure loading
Thermal stress-induced warping
Insufficient hardness leading to permanent deformation
Corrosion in humid processing environments

FMEA Triads

Trigger: Inadequate material hardness or improper heat treatment
Failure: Permanent deformation under pressure causing profile dimensional inaccuracies
Mitigation: Specify minimum 48 HRC hardness with certified heat treatment documentation and implement regular hardness testing

Trigger: Thermal cycling exceeding material limits
Failure: Micro-cracking and reduced fatigue life
Mitigation: Implement controlled heating/cooling cycles and use materials with matched thermal expansion coefficients to adjacent components

Trigger: Improper mounting or uneven clamping force
Failure: Localized stress concentrations leading to premature failure
Mitigation: Use torque-controlled fastening procedures and verify flatness during installation with precision straightedges

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flatness: ±0.02 mm/m, Parallelism: ±0.03 mm, Thickness: ±0.1 mm

Test Method

Coordinate measuring machine (CMM) verification, surface plate inspection with dial indicators, ultrasonic thickness testing, Rockwell hardness testing per ASTM E18

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 Backer Plate

Manufacturer profiles associated with Backer Plate.

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Frequently Asked Questions

What is the primary function of a backer plate in extrusion dies?

The backer plate provides structural support to prevent die plate deflection under high extrusion pressure, ensuring consistent profile dimensions and material flow distribution.

How does backer plate thickness affect extrusion performance?

Thicker plates increase rigidity and pressure distribution but add weight and thermal mass. Optimal thickness balances deflection control with thermal responsiveness for the specific extrusion material and pressure.

Can backer plates be refurbished or resurfaced?

Yes, worn backer plates can be resurfaced through precision grinding if minimum thickness requirements are maintained, though heat treatment may need reapplication depending on material removal depth.

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.

Backer Plate