3D Printed Injection Mold Coating for Thermal Management
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Solution Overview
Problem
Existing three-dimensional printed injection molds have a short lifespan due to high temperatures and pressures, leading to softening, thermal warpage, or hot tearing, limiting their use in rapid production and prototyping.
Innovation Solution
A modified mold design incorporating a cooling channel between exterior and interior walls and a coating on the interior wall to enhance thermal conductivity, with conformal air micro channels and water channels to efficiently transfer heat away from the mold body, and a housing with through-bores for improved thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 3D printed polymeric molds are used for rapid prototyping and small batch manufacturing, then manufacturing cost and turnaround time are reduced, but the mold lifespan is limited to maximum 100 parts due to softening, thermal warpage, or hot tearing
Solution Approach 1:
The patent applies composite materials by combining 3D printed polymeric mold bodies with metal coatings (such as nickel, chromium, or other refractory metals) deposited on the cavity surfaces. This composite structure allows the mold to maintain the manufacturing advantages of 3D printing while gaining the thermal stability and durability of metal coatings, extending lifespan from 100 parts to potentially 1000+ parts.
Solution Approach 2:
The patent changes the thermal and mechanical parameters of the mold surface through coating applications. The metal coatings alter the surface properties to resist softening, thermal warpage, and hot tearing, thereby extending the operational lifespan while maintaining the cost-effectiveness of 3D printed molds for rapid prototyping and small batch production.
2Strength
If conventional subtractive manufacturing techniques are used to make steel or aluminum mold tools, then mold strength and durability are improved for high-volume manufacturing, but manufacturing cost increases and turnaround time extends to 15+ days
Solution Approach 1:
The patent creates a composite system where 3D printed polymeric molds are enhanced with metal coatings to achieve the strength and durability previously only available in steel or aluminum molds. This allows small batch manufacturing and rapid prototyping to access high-durability characteristics without the high costs and long lead times of conventional mold making.
Solution Approach 2:
The patent applies local quality by depositing metal coatings only on the cavity surfaces that require enhanced durability and thermal resistance, rather than making the entire mold from expensive metal. This localized enhancement provides the necessary strength and durability for high-volume manufacturing capability while maintaining the cost and time advantages of 3D printing for the bulk mold structure.
3Temperature
If conformal water cooling channels are incorporated in large channels in the interior of molds, then cooling capability is improved, but the thermal conductivity of the polymer is prohibitively low and the front of the mold cannot sufficiently exhaust heat
Solution Approach 1:
The patent introduces metal coatings as an intermediary layer between the polymer mold body and the cooling system. These metal coatings have high thermal conductivity and act as heat transfer mediators, efficiently conducting heat from the cavity surfaces to the conformal water cooling channels, thereby overcoming the low thermal conductivity limitation of the polymer material and improving heat exhaustion efficiency.
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 solution significantly extends the lifespan of the molds, allowing for more efficient and cost-effective production of injection molded parts by effectively managing heat and maintaining mechanical integrity under high pressures.
Implementation Method 1
The cooling channel is thereby configured to improve the thermal conductivity of the mold body by transferring heat energy from the mold body to the environment exterior to the exterior wall
Implementation Method 2
The interior wall of the mold body includes at least one coating disposed thereon, with the at least one coating being configured to improve the thermal conductivity of the mold body
Data Source
AI summary
A problem exists of prohibitively high costs associated with molds for small run, legacy, or prototype injection molded parts. Further, the lead time on molds is currently on the order of about two weeks. A mold is provided that is formed from three-dimensional printing. The mold includes a series of air and/or water cooling channels to limit thermal stresses to the mold. Additionally, a series of coatings is added to the surface of a 3D printed mold to extend the lifetime of the mold and increase the performance of the mold. The coatings perform a function other than to define a shape of an injection cavity, such as improving thermal conductivity, providing a thermal barrier between the injection material and the mold body, or improving the detachment of the final mold product from the mold body.