Resin Injection Mold Ventilation Channel Design
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Solution Overview
Problem
Existing molds for resin injection molding face challenges in achieving uniform gas pressure and efficient heating and cooling due to communication resistance and non-uniform ventilation volume caused by low-density shaped portions used for both primary and secondary vents.
Innovation Solution
A mold design with ventilation channels forming a hollow state surrounded by a peripheral wall of high-density or low-density shaped portions, where secondary vents are formed with a thinner wall than the shaping region, ensuring equal pressure and efficient gas flow between primary and secondary vents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all ventilation channels (primary vent and secondary vent) are formed by low-density shaped portion, then gas venting function is fulfilled, but communication resistance increases causing extremely high pressure and non-uniform ventilation volume
Solution Approach 1:
The patent applies local quality by differentiating the density characteristics of different vent regions. The secondary vent is formed entirely by low-density shaped portion to ensure gas permeability and venting function, while the primary vent includes high-density shaped portion to reduce communication resistance and control pressure. This localized differentiation allows each region to perform its specific function optimally without compromising the other.
2Productivity
If all ventilation channels are formed by low-density shaped portion, then gas flow is enabled, but pressure at secondary vent becomes non-uniform affecting heating and cooling uniformity
Solution Approach 1:
The patent implements local quality by assigning different density characteristics to different vent regions. The primary vent incorporates high-density shaped portion to regulate and uniformize pressure distribution, while the secondary vent uses low-density shaped portion to maintain gas flow efficiency. This spatial differentiation of material properties ensures both uniform pressure at secondary vents and efficient gas flow through the ventilation system.
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 design prevents pressure loss and achieves uniform heating and cooling with controlled ventilation volume, enhancing the efficiency and uniformity of gas flow during resin injection molding.
Implementation Method 1
a low-density shaped portion having a sintered density that allows a gas discharged with filling of a gas or resin blown or sucked in heating or cooling to pass therethrough
Implementation Method 2
a constitution in which all of the ventilation channels through which a gas blown or sucked by a primary vent passes and a secondary vent which are in contact with a resin molding portion are formed by a low-density shaped portion
Data Source
Figure 1~2
Figure 3
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AI summary
A mold for resin injection molding (1) having a shaping region formed by a low-density shaped portion (22) and a high-density shaped portion (21) in which each ventilation channel (32) for gas existing between external region and molding portion region forms a hollow state with situation surrounded by a peripheral wall having any oneorbothof thehigh-densityshapedportion (21) andthelow-density shaped portion (22), and the secondary vent (33) connecting communicatively with a region molding portion is formed only by a low-density shaped portion (22) with thickness thinner than that of the shaping region.