Hybrid Micromachining and Electroplating for Microstructure Array Mold Fabrication
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Solution Overview
Problem
Existing methods for manufacturing polymeric microstructure array molds are complex and require extensive machining, making them inefficient and costly.
Innovation Solution
A method involving the formation of a master mold through micromachining processes, followed by electroplating and mechanical micromachining to create a durable metal mold, which reduces the need for extensive machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional micromolding and lithography techniques are used to fabricate molds, then microstructure arrays can be produced, but the manufacturing process becomes complex and requires extensive machining
Solution Approach 1:
The patent uses a master mold with microprotrusions to create negative impressions in elastomeric material, which are then used as molds. This copying approach allows the complex microstructure geometry to be replicated without requiring complex machining operations for each subsequent mold, thereby reducing device complexity while maintaining manufacturing precision
Solution Approach 2:
The patent replaces conventional mechanical micromolding and lithography techniques with a solvent casting method. Instead of using complex mechanical machining processes to create molds, the invention uses chemical solvent casting where the mold material (elastomer) chemically interacts with the master mold to create accurate replicas, simplifying the manufacturing process while maintaining precision
2Manufacturing precision
If conventional micromolding techniques are used, then microstructure arrays can be manufactured, but extensive machining is required making the process inefficient and costly
Solution Approach 1:
The patent replaces time-consuming mechanical machining operations with a chemical solvent casting process. The mold material is cast onto the master mold and cured chemically, which is significantly faster and more efficient than mechanical micromachining, thereby improving productivity while maintaining the required manufacturing precision for microstructure arrays
Solution Approach 2:
The patent creates a master mold with the desired microstructure geometry in advance using photolithography. This preliminary action allows subsequent molds to be created through simple solvent casting without requiring repeated complex machining operations, thereby improving manufacturing efficiency for producing multiple microstructure arrays
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
This method simplifies the manufacturing process, reduces costs, and allows for the production of microstructure array molds with desired shapes and structures efficiently.
Implementation Method 1
electroplating a metal onto the mold, to fill cavities in the mold and to create a base layer
Data Source
AI summary
A method of forming a master mold (52), comprising: a) forming a plurality of microstructure portions (42) in a substrate formed of a first material by a first micromachining process, each microstructure portion comprising a shaft (40) and a distal tip (38); b) preparing a negative mold (46) of the plurality of microstructure portions, wherein the mold is formed of a second material and comprises a plurality of cavities (48) corresponding to each microstructure portion in the plurality of microstructure portions (42); c) electroplating a metal (50) onto the negative mold to fill each cavity in the plurality of cavities and to form a base layer (54) extending from the negative mold; d) forming a proximal section (56) for each of the microstructures in the base layer using a second micromachining process (e.g. mechanical micromachining); and e) before or after said step d), removing the negative mold from the metal to form a master mold.