Composite Tooling Joint With Overmolded Ceramic-Polymer Punch
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Solution Overview
Problem
Existing tooling for powder compaction, such as metallic and ceramic assemblies, face issues with brittleness, joint weakness, and frequent replacement, leading to increased maintenance and refurbishing costs due to wear and strain hardening.
Innovation Solution
A composite tooling assembly combining a ceramic or cermet punch with a polymer composite base, utilizing overmolding to create a secure connection through grooves and protuberances, enhancing tensile strength and preventing rotational movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic components are used in metallic tooling assemblies, then compressive properties are improved, but brittleness and chipping increase
Solution Approach 1:
The patent applies composite materials by combining ceramic components with polymer matrix material to create a hybrid structure. The ceramic portions provide superior compressive properties while the polymer matrix provides flexibility and impact resistance, eliminating the brittleness issue of pure ceramic tooling.
2Strength
If ceramic punch is connected to steel housing, then compressive strength is improved, but joint weakness and force transfer failure increase
Solution Approach 1:
The patent replaces the steel-ceramic joint with a polymer-ceramic composite structure. The polymer matrix material bonds to the ceramic punch, creating a unified composite component that eliminates the weak joint interface between dissimilar materials while maintaining force transfer integrity.
Solution Approach 2:
The patent merges the ceramic punch and polymer housing into a single integrated composite component. The ceramic punch is embedded within and bonded to the polymer matrix, eliminating the separate joint interface and creating a unified structure that transfers force efficiently throughout the tooling assembly.
3Duration of action of stationary object
If metallic tooling is used, then durability is reduced due to creep and bending, but weight and shipping cost increase
Solution Approach 1:
The patent uses polymer composite materials with high strength-to-weight ratios to replace traditional metallic tooling. These composite materials provide comparable or superior durability without creep and bending while significantly reducing the weight of the tooling assembly.
4Ease of repair
If EDM techniques are used to replace ceramic rod, then ceramic replacement is achieved, but steel housing is progressively weakened
Solution Approach 1:
The patent replaces the ceramic rod with a ceramic-polymer composite rod that is integrated into the housing. This composite structure eliminates the need for EDM machining to replace the rod, as the composite material can be replaced as a unified component without progressively weakening the housing through repeated machining operations.
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 tooling provides improved durability, reduced maintenance, and cost-effectiveness by leveraging ceramic properties while minimizing the drawbacks of metallic connections, with enhanced tensile strength and flexibility.
Implementation Method 1
The rod is overmolded with a polymer composite material to form a polymer composite base rod portion
Data Source
AI summary
A tooling assembly, including an elongated ceramic member having a distal end and an oppositely disposed proximal end, a plurality of spaced protuberances extending from the elongated proximal end, at least one groove formed in the proximal end, and an elongated polymer member enveloping the distal end. The overlap of the elongated polymer member and the elongated ceramic member defines a joint. The joint has a tensile strength of at least 11121 Newtons.