Adjustable Glass Saddle Mold for Flash-Free Rubber Encapsulation
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Solution Overview
Problem
Existing glass encapsulation molds face challenges in sealing against varying glass thicknesses, leading to flash issues and require time-consuming, inefficient, and risky adjustments due to the need for precise assembly and high operating temperatures.
Innovation Solution
A mold with an adjustable glass saddle made from a material with a higher thermal expansion rate than surrounding components, allowing external user adjustment via a mechanical system with wedges and springs, and enhanced cooling features to reduce downtime and safety risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mold uses fixed shims under the glass saddle to compensate for glass thickness variation, then the glass gap can be adjusted, but the mold requires partial disassembly and extensive downtime for adjustment
Solution Approach 1:
The glass saddle is made adjustable through a mechanical system with wedges and springs that can be operated externally, transforming a static fixed-saddle design into a dynamic adjustable one. This allows the glass gap to be modified without disassembling the mold, resolving the contradiction between adjustment precision and adjustment downtime.
Solution Approach 2:
A mechanical intermediary system consisting of wedges, springs, and a user-interface mechanism is introduced between the glass saddle and the mold structure. This intermediary allows external operation to internally adjust the glass gap, eliminating the need for direct access to the tight, dangerous location inside the mold and reducing adjustment downtime.
2Temperature
If the mold is heated to high operating temperature (350-410°F) for rubber curing, then the rubber can properly vulcanize, but the glass saddle material must withstand thermal expansion differences
Solution Approach 1:
The glass saddle is made from a material with a higher thermal expansion coefficient than the surrounding mold materials. This deliberate use of thermal expansion differences allows the saddle to expand more than the mold cavity when heated, creating a press fit that maintains sealing reliability at high operating temperatures while accommodating glass thickness variations.
Solution Approach 2:
The material selection for the glass saddle is specifically optimized to have different thermal expansion characteristics compared to the mold materials. This parameter change in material properties enables the system to maintain reliable sealing and fit stability throughout the temperature range from room temperature to 350-410°F operating conditions.
3Ease of operation
If a gap of 0.03 mm is provided between the glass saddle and mold cavity parts at room temperature, then mechanical adjustment systems can function properly, but the gap must be closed during operation to prevent flash
Solution Approach 1:
The glass saddle material's higher thermal expansion coefficient causes it to expand more than the mold cavity when heated to operating temperature. This thermal expansion automatically closes the 0.03 mm gap that exists at room temperature to allow adjustment, eliminating the gap during operation and preventing rubber flash without requiring additional sealing mechanisms.
Solution Approach 2:
The system utilizes the thermal phase transition from room temperature to operating temperature (350-410°F) to transform the gap state from open (for adjustment) to closed (for sealing). This temperature-driven phase transition in the material dimensions automatically resolves the contradiction between needing a gap for adjustment and needing no gap to prevent flash.
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 effectively eliminates flash by creating a press fit during heating and allows for quick, safe adjustments without disassembly, enhancing the efficiency and safety of the glass encapsulation process.
Implementation Method 1
a glass saddle comprising a material with a higher rate of thermal expansion than surrounding, adjacent, and/or related mold materials and portions
Implementation Method 2
enhanced cooling features to reduce downtime and safety risks
Data Source
AI summary
An injection molding apparatus is provided that is suited for rubber injection and glass-encapsulation molding. A gap or interior portion of the mold for receiving a glass structure is provided, and the gap is adjustable by manipulation of a user-interface portion that extends outside of the mold and/or through the properties of thermal expansion based on select materials.