Mold Closing Surface Roughness for Glass Thermoforming
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Solution Overview
Problem
Existing optical technologies face issues with uneven filling, asynchronous demoulding, and a large error between mold cavities during the production of glass products using thermoforming molds.
Innovation Solution
A mold design featuring a lower and upper mold with pressing surfaces that include molding surfaces and closing surfaces with sequentially arranged mold closing regions, where the surface roughness increases from the center to the outside, improving filling efficiency and demoulding synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional glass processing mold is used for thermoforming, then the glass product can be produced, but uneven filling occurs where the center is filled easier than the periphery
Solution Approach 1:
The mold closing surface is designed with varying surface roughness in different regions. Specifically, the surface roughness increases from the center to the periphery of the mold closing surface, creating different friction characteristics in different locations. This local variation in surface quality helps the glass material fill more uniformly across the entire mold cavity, addressing the uneven filling problem where the center was filled easier than the periphery.
2Ease of operation
If a conventional glass processing mold is used, then the glass product can be formed, but asynchronous demoulding occurs between different regions of the mold
Solution Approach 1:
The mold closing surface incorporates regions with different surface roughness values, creating varying friction forces between the glass product and mold surface at different locations. This local differentiation in surface properties ensures that demoulding occurs more uniformly across the entire mold cavity, eliminating the asynchronous demoulding problem where different regions released at different times.
3Productivity
If a conventional glass processing mold is used, then production can proceed, but a relatively large error between mold cavities exists
Solution Approach 1:
By designing the mold closing surface with a specific roughness distribution pattern (increasing from center to periphery), the invention creates more uniform filling and demoulding conditions across all mold cavities. This reduces the variability between different mold cavities, thereby decreasing the error between mold cavities while maintaining production capacity.
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 proposed mold design enhances even filling, achieves synchronous demoulding, and reduces the error between mold cavities, resulting in improved glass product quality and manufacturing efficiency.
Implementation Method 1
The at least two mold closing regions have surface roughnesses increasing from the center to the outside
Data Source
AI summary
A mold for molding a glass product is provided. The mold includes a lower mold and an upper mold. The lower mold includes a lower pressing surface. The upper mold includes an upper pressing surface. The upper pressing surface includes a plurality of upper molding surfaces and an upper mold closing surface connecting the plurality of upper molding surfaces. The lower pressing surface includes a plurality of lower molding surfaces and a lower mold closing surface for connecting the plurality of lower molding surfaces. The upper mold closing surface and/or the lower mold closing surface include at least two mold closing regions sequentially arranged from center to outside. The at least two mold closing regions have surface roughnesses increasing from center to outside. The disclosure achieves the technical effect of even filling, synchronous demoulding, and reduced error between mold cavities.