INDUSTRY COMPONENT

Bolster Plate

A bolster plate is a structural support component in extrusion dies that distributes clamping forces and maintains die alignment during plastic or metal extrusion processes.

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Component Specifications

Definition
The bolster plate is a critical structural element in extrusion die assemblies, typically positioned between the die body and the extrusion press. Its primary function is to evenly distribute high clamping forces (often exceeding 1000 tons) across the die face, preventing distortion and maintaining precise alignment of die components during operation. This component ensures uniform material flow, dimensional stability of extruded profiles, and protects delicate die elements from excessive mechanical stress.
Working Principle
The bolster plate operates on the principle of force distribution and structural reinforcement. When the extrusion press applies clamping pressure, the bolster plate transfers this force evenly across the entire die surface through its rigid construction. This prevents localized stress concentrations that could cause die deflection or misalignment. The plate's thickness and material properties are engineered to withstand cyclic loading while maintaining dimensional stability throughout production cycles.
Materials
Typically manufactured from high-strength alloy steels (AISI 4140, 4340, H13 tool steel) or pre-hardened steels (P20, 718) with hardness ranging from 28-42 HRC. For corrosive environments, stainless steel grades (17-4PH, 420) may be used. Surface treatments include nitriding or chrome plating for wear resistance.
Technical Parameters
  • Hardness 30-40 HRC
  • Surface Finish Ra 0.8-1.6 μm
  • Thickness Range 50-300 mm
  • Flatness Tolerance ±0.05 mm/m
  • Thermal Expansion Coefficient 11-13 ×10⁻⁶/°C
Standards
ISO 12164, DIN 69893, ASTM A681

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bolster Plate.

extrusion die bolster plate die support plate clamping plate extrusion tooling die alignment plate force distribution plate Bolster Plate Bolster Plate in Machinery and Equipment Manufacturing

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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Stamping Module

A specialized component within an automated production line that performs metal stamping operations to shape or cut materials.

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Engineering Analysis

Risks & Mitigation
  • Fatigue cracking under cyclic loading
  • Thermal distortion in high-temperature applications
  • Wear at mounting interfaces
  • Improper force distribution leading to die deflection
FMEA Triads
Trigger: Insufficient plate thickness or material strength
Failure: Excessive deflection under clamping forces
Mitigation: Conduct finite element analysis (FEA) to optimize thickness and select appropriate high-strength materials
Trigger: Poor surface finish or flatness
Failure: Uneven force distribution and die misalignment
Mitigation: Implement precision grinding and lapping processes with strict flatness verification
Trigger: Inadequate thermal management
Failure: Thermal expansion mismatch causing stress concentrations
Mitigation: Design with compatible thermal expansion coefficients and incorporate cooling channels where necessary

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness: ±0.05 mm/m, Parallelism: ±0.03 mm, Dimensional: IT7 grade
Test Method
Coordinate measuring machine (CMM) verification, surface plate inspection with dial indicators, ultrasonic thickness testing

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the main purpose of a bolster plate in extrusion dies?

The primary purpose is to evenly distribute clamping forces from the extrusion press across the die face, preventing distortion and maintaining precise alignment of all die components during operation.

How does bolster plate thickness affect extrusion performance?

Thicker plates provide greater stiffness and better force distribution but increase tooling weight and cost. Optimal thickness balances deflection resistance with practical handling considerations.

Can bolster plates be used with different die materials?

Yes, they are compatible with various die materials including tool steels, carbide inserts, and ceramic components, provided proper interface design and thermal expansion considerations are addressed.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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Body/Casing Bolt Assembly