Injection Molded Components for Road Construction Signage
This project involved the design and production of two custom injection-molded nylon components used in road construction, specifically for “STOP/SLOW” signs. These parts work together to allow the sign’s pole to telescope upward, increasing its height for enhanced visibility and improved safety on roadways.
Both components are manufactured using 4-cavity molds, producing four identical parts per cycle to maximize efficiency and output. The smaller cap is particularly complex due to its internal threaded design, which presents significant molding challenges. To achieve this, the mold utilizes an unscrewing mechanism that disengages the threads from the molded part during ejection.
The unscrewing process required a highly intricate mold design incorporating gears and hydraulic systems to rotate the cores precisely. This level of engineering ensures the threads are formed accurately and released without damage, maintaining the part’s quality and functionality.
The result is a set of durable, precision-molded components that play a critical role in road safety equipment, providing reliable performance in demanding field conditions.
Mold Configuration
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Both components are manufactured using 4-cavity molds, allowing for the production of four identical parts per cycle.
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This configuration maximizes efficiency and output, reducing cycle time and increasing production capacity.
Complex Part Design
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The smaller cap features an internal threaded design, which is inherently challenging to mold.
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Traditional ejection methods cannot be used because of the threaded geometry, requiring a specialized solution.
Unscrewing Mechanism
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To release the threaded part, the mold incorporates an unscrewing mechanism.
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During ejection, this mechanism disengages the threads by rotating the core, allowing the part to be safely removed.
Engineering Requirements
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The unscrewing process required a highly intricate mold design, including:
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Precision gears to control the rotation.
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Hydraulic systems to drive the movement of the cores.
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This advanced engineering ensures:
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Accurate thread formation.
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Clean and damage-free part release.
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Consistent part quality and functionality over repeated production cycles.
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