Silicon Mold Parallelism Adjustment for High-Temperature Molding
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Solution Overview
Problem
Traditional silicon mold designs fail to account for the thermal expansion and deformation of both the mold base and mold core, leading to precision issues such as altered clamping and centering positions, and unaddressed parallelism problems during high-temperature compression molding of optical elements.
Innovation Solution
A silicon mold device with an upper and lower mold base, supported by symmetrical upper mount columns and secured by spring push blocks, pre-press blocks, and high-precision quartz strips, allowing for adjustable force and precise positioning to mitigate deformation and ensure parallelism, with detection holes for monitoring deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional silicon mold design is used, then the mold structure is simple, but the processing precision deteriorates due to unaddressed thermal expansion and deformation
Solution Approach 1:
The mold base is divided into upper and lower segments with independent mounting structures. Each segment has its own support columns and positioning mechanisms, allowing separate adjustment and compensation for thermal deformation, thereby maintaining processing precision without requiring a completely complex integrated structure
Solution Approach 2:
The mold incorporates adjustable parameters through screw mechanisms and spring-loaded positioning blocks that can be tuned to compensate for thermal expansion. By changing geometric parameters and positioning adjustments, the system maintains precision despite temperature-induced dimensional changes
2Manufacturing precision
If fixed parallelism design is used, then the manufacturing process is simple, but the parallelism between upper and lower molds cannot be adjusted, compromising precision
Solution Approach 1:
The parallelism adjustment mechanism transforms the static fixed parallelism design into a dynamic adjustable system. Screw-driven adjustment devices allow the parallelism between upper and lower molds to be modified during maintenance or operation, enabling precision compensation without requiring complex manufacturing processes
Solution Approach 2:
The mold design incorporates pre-adjusted parallelism features during manufacturing, with built-in adjustment capabilities activated only when needed. This preliminary setup reduces manufacturing complexity while maintaining the ability to adjust parallelism precision when required
3Manufacturing precision
If thermal expansion of mold base is ignored, then the design is simple, but the clamping and centering position changes, affecting product precision
Solution Approach 1:
The mold base incorporates compensation mechanisms that actively account for thermal expansion. Expansion joints and adjustable positioning systems are designed with predetermined thermal growth allowances, allowing the clamping and centering positions to be maintained despite temperature-induced dimensional changes in the mold base
4Manufacturing precision
If silicon mold core expansion at high temperature is ignored, then the design is simple, but eccentricity occurs in the mold core, affecting product precision
Solution Approach 1:
The centering adjustment mechanism uses asymmetric positioning features that compensate for the symmetric thermal expansion of the silicon mold core. By introducing controlled asymmetric adjustment elements, the system counteracts the symmetric expansion forces and maintains precise centering despite high-temperature conditions
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 enhances processing precision and adjustability, achieving dimensional tolerance and form precision within 1 micron, improving the accuracy and reliability of high-temperature compression molding processes.
Implementation Method 1
spring push blocks symmetrically outside the silicon mold core and connected to the lower mold base by springs
Implementation Method 2
quartz strips, situated below the spring push blocks, serve to limit the specific position of the silicon mold core during fixation
Implementation Method 3
detection holes for monitoring deformation
Data Source
AI summary
The present invention relates to a silicon mold device for production of an optical element in a high temperature environment and a preparation method thereof. The silicon mold device utilized in this invention features a symmetrical structure, ensuring uniform deformation during heating to mitigate eccentricity issues. Additionally, a stepped silicon mold core is employed and secured by applying force through an electrode pressure plate, thereby enhancing overall parallelism. Support columns assist in the closure and alignment of the upper and lower molds. Each support column can be individually adjusted for parallelism, facilitating the enhancement of precision and reliability in the preparation of optical elements.