Bell-Shaped Fixed Platen for Flat Resin Sealing Molds
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Solution Overview
Problem
Existing resin sealing apparatuses face challenges in maintaining mold fixing surface flatness while applying large mold closing forces, leading to deformation and increased weight due to thick and heavy platens, which are contradictory issues.
Innovation Solution
A resin sealing apparatus with a fixed platen design featuring a bell-shaped portion, circumferential recessed portion, and integral formation by casting, which concentrates stress on arm portions to prevent deformation and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the fixed platen is increased to prevent deformation of the mold fixing surface under large mold closing forces, then the flatness of the mold fixing surface is maintained, but the weight of the fixed platen increases significantly
Solution Approach 1:
The fixed platen employs local quality by varying the thickness distribution - the bell-shaped portion has increased thickness at its base where stress concentrates, while other areas maintain standard thickness. This localized reinforcement prevents deformation at critical stress points without uniformly increasing the entire platen's weight, resolving the contradiction between maintaining flatness and reducing weight.
Solution Approach 2:
The bell-shaped portion with its curved, spherical-like geometry provides structural strength through geometric shape rather than uniform thickness increase. The curved surfaces distribute stress more effectively, maintaining flatness of the mold fixing surface while using less material compared to a uniformly thick design, thus reducing overall weight.
2Strength
If a thicker fixed platen is used to withstand large mold closing forces, then deformation is prevented, but the complexity of the press device increases
Solution Approach 1:
The bell-shaped portion is integrally formed with the main body of the fixed platen through casting, merging the reinforcement structure with the base component. This integration eliminates the need for separate reinforcement plates or additional fastening mechanisms, maintaining strength while reducing structural complexity and the number of parts.
3Force
If the fixed platen is made thicker to maintain flatness, then mold closing force capacity increases, but the production efficiency decreases due to heavier weight
Solution Approach 1:
By concentrating material only where stress occurs (at the base of the bell-shaped portion) rather than uniformly throughout, the design maintains the ability to withstand large mold closing forces while minimizing unnecessary weight. This localized reinforcement improves production efficiency by reducing inertial effects during rapid platen movement while preserving force capacity.
Data Source
AI summary
The resin sealing apparatus according to the present invention includes a press device for closing and opening an upper mold and a lower mold. The press device includes a fixed platen to which one of the upper mold and the lower mold is fixed and a movable platen to which the other one is fixed, a tie bar fixing the fixed platen and holding the movable platen so that the movable platen can be lifted and lowered, and a drive device lifting and lowering the movable platen. The fixed platen has a fixed portion fixed to the tie bar on the side of a first surface of a main body portion and a bell-shaped portion provided on the side of a second surface opposite to the first surface, and one of the upper mold and the lower mold is fixed to the bell-shaped portion.