Polycrystalline Diamond Injection Mold Cavity Wear Resistance
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Solution Overview
Problem
Injection molding molds made from traditional materials like steel and aluminum exhibit uneven wear rates due to variations in polymer flow rates and temperatures, leading to reduced lifecycle and cost effectiveness, necessitating the development of materials with improved wear resistance.
Innovation Solution
The use of superhard materials such as polycrystalline diamond and other superhard materials to form at least a portion of the mold cavity, which can be combined with substrates and secured to mold plates to create durable and long-lasting injection mold assemblies and inserts, allowing for the formation of mold cavities of various sizes and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional materials like steel and aluminum are used for injection mold cavities, then the initial manufacturing cost is lower, but the wear resistance and lifecycle are reduced
Solution Approach 1:
The patent applies composite materials by combining superhard material (such as polycrystalline diamond) with a substrate material to form a molding element. The superhard material provides exceptional wear resistance for the mold cavity surfaces, while the substrate provides structural support and ease of manufacture. This composite structure resolves the contradiction by achieving high reliability through the superhard material layer while maintaining manufacturing feasibility through the substrate.
2Duration of action of stationary object
If superhard materials are used to form mold cavities, then wear resistance and lifecycle are significantly increased, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the mold cavity into distinct components: a substrate portion and a superhard material portion. The superhard material is applied as a separate layer or coating on the substrate, rather than attempting to manufacture the entire mold cavity from superhard material. This segmentation reduces device complexity by allowing each component to be manufactured and processed independently, then assembled together.
Solution Approach 2:
The patent applies local quality by concentrating the superhard material specifically at the mold cavity surfaces where wear occurs, rather than making the entire mold structure from superhard material. The superhard material is applied locally to the portions of the substrate that form the mold cavity, providing enhanced wear resistance only where needed, while the rest of the mold structure maintains the properties of the substrate material.
3Productivity
If superhard materials are used in injection molds, then the productivity and number of components produced increase, but the initial investment and manufacturing cost increase
Solution Approach 1:
The patent changes the material parameter of the mold cavity from traditional steel or aluminum to a composite structure with superhard material. This parameter change dramatically increases the wear resistance and extends the mold lifecycle, allowing the production of many more components before the mold requires replacement or major maintenance. The initial manufacturing cost increase is offset by the extended productivity and reduced downtime for mold replacement.
Data Source
AI summary
Embodiments relate to injection mold assemblies that include superhard materials, such as polycrystalline diamond compacts (“PDCs”), and related injection mold presses, components, and methods. The superhard materials are positioned to define at least a portion of a mold cavity for injection molding. Superhard materials may be fully or partially encapsulated by a substrate and the superhard materials and substrate may be secured to the injection mold. Superhard materials may be formed or otherwise separated from a substrate and secured to the injection mold without support of a substrate. Superhard materials may also be attachable to an injection mold to define only a portion of a mold cavity. In an embodiment, an injection mold insert includes a superhard material for insertion into a generic cavity within an injection mold assembly.