PAEK Composite Mold Inserts for Rapid Tooling
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Solution Overview
Problem
Conventional mold production techniques are costly and inefficient for small production batches, and additive manufacturing methods face limitations with material availability and part geometry constraints, while rapid tooling techniques often result in rough surfaces requiring extensive machining.
Innovation Solution
A composite article made from a polyarylether ketone (PAEK) composition with thermally conductive fillers, such as ceramics, metals, and carbon-based additives, enhanced with reinforcing fibers, achieving improved thermal conductivity and mechanical properties suitable for rapid tooling applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional building technologies (milling or electric discharge machining) are used to produce molds, then the tools are very robust and suitable for mass production, but the costs are prohibitive for smaller production batches
Solution Approach 1:
The patent changes the material parameters by using PAEK polymers with specific thermal conductivity values (0.25-0.50 W/mK) and mechanical properties (tensile strength ≥50 MPa, flexural modulus ≥3.0 GPa) to create mold inserts that maintain robustness while enabling cost-effective production for small batches through additive manufacturing
Solution Approach 2:
The patent employs composite materials consisting of PAEK polymer matrices combined with thermally conductive fillers (such as aluminum oxide, boron nitride, or carbon fibers) to achieve the required thermal conductivity and mechanical strength properties for robust mold inserts manufactured by additive processes
2Ease of manufacture
If additive manufacturing techniques (powder bed fusion or FFF) are used to produce parts, then there is no upfront tooling cost making it appealing for small batches, but the materials available are limited and part geometries are constrained
Solution Approach 1:
The patent expands material parameters for additive manufacturing by developing PAEK-based compositions with controlled thermal conductivity (0.25-0.50 W/mK) and mechanical properties that can be processed by both powder bed fusion and FFF techniques, significantly broadening the range of suitable materials beyond the narrow subset previously available
Solution Approach 2:
The patent uses composite materials combining PAEK polymers with various thermally conductive fillers to create formulations that are compatible with multiple additive manufacturing processes (powder bed fusion and FFF), thereby increasing adaptability and versatility while maintaining the advantage of no upfront tooling costs
3Strength
If metal laser sintering is used for rapid tooling, then robust molds with suitable material properties are produced, but the sintering process results in rough surfaces requiring extensive machining
Solution Approach 1:
The patent changes the material composition parameters by formulating PAEK-based composites with optimized filler content and distribution to achieve both the required mechanical strength (tensile strength ≥50 MPa) and improved surface finish quality that reduces or eliminates the need for extensive post-machining operations
Solution Approach 2:
The patent employs composite materials with PAEK polymer matrices and thermally conductive fillers that provide both the robustness needed for mold applications and surface properties that are more suitable for direct use or require minimal finishing, thereby resolving the contradiction between strength and manufacturing precision
4Productivity
If rapid tooling techniques are used, then time and cost for mold-forming process are reduced and flexibility in tool design is improved, but the tools require withstanding high temperature and pressure conditions
Solution Approach 1:
The patent changes the thermal and mechanical parameters of the mold material by selecting PAEK polymers with high service temperature capability and appropriate mechanical strength to withstand injection molding pressures, enabling rapid tooling applications while maintaining reliability under high temperature and pressure conditions
Solution Approach 2:
The patent uses composite materials combining PAEK polymers with thermally conductive fillers to enhance heat dissipation capability and mechanical strength, allowing the rapid tooling inserts to withstand the high temperature and pressure conditions of injection molding while maintaining the productivity benefits of reduced mold-forming process time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite article exhibits enhanced thermal conductivity and mechanical properties, reducing molding cycle times and enabling the production of robust, cost-effective mold parts with improved surface finish and adaptability for various geometries.
Implementation Method 1
a composite article, such as a mold part or an extrusion die, made of a composition based on PAEK(s) and a thermally conductive filler, wherein the composite article has a thermal conductivity measured according to the Guarded Heat Flow Meter Technique as described in ASTM E1530-19 at 25° C. of at least 0.5 W/mK
Data Source
AI summary
The invention concerns a composite article, such as a mold part or an extrusion die, made of a composition comprising at least one polyarylether ketone and at least one thermally conductive filler, wherein the composite article has a thermal conductivity of at least 0.5 W/mK. The invention also concerns a composition and uses thereof.