Two-Shot Molded Parts for Portable Electronics
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Solution Overview
Problem
The complex and costly process of forming housing parts for portable electronic devices using jigs and adhesives in traditional methods limits efficiency and accuracy, particularly in creating intricate designs that obstruct molding tool movement.
Innovation Solution
A two-shot injection molding process where a first molded part with guide portions is formed, allowing a second molded part to be accurately positioned and integrated, eliminating the need for adhesives and jigs, and enabling the creation of complex designs with different materials and structural features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional methods using jigs and adhesives are used to join cover parts, then the housing can be assembled, but the process becomes complex and costly
Solution Approach 1:
The patent merges the joining function into the molding process itself by creating interlocking features directly during injection molding. The first and second molded parts include integrated protrusions and recesses that mechanically interlock, eliminating the need for separate joining operations using jigs and adhesives. This integration of joining functionality into the primary manufacturing process simplifies the overall manufacturing approach while reducing process complexity.
Solution Approach 2:
The molded parts are designed with self-aligning and self-locking features that enable automatic positioning and securing during assembly. The guide portions on the first molded part automatically align with corresponding features on the second molded part, and the interlocking protrusions and recesses automatically secure the parts together without requiring external jigs or adhesive application equipment. This self-service capability eliminates complex auxiliary joining equipment.
2Strength
If jigs and adhesives are used for adhering cover parts, then parts can be joined, but production costs increase
Solution Approach 1:
The joining function is merged into the injection molding process, allowing mechanical interlocking features to be created during the primary manufacturing operation. This eliminates the need for separate adhesive application steps and associated materials, reducing manufacturing costs while maintaining joint strength through the molded-in interlocking geometry.
Solution Approach 2:
The patent replaces expensive adhesive materials and complex jigging equipment with simple molded-in plastic features that are integral to the parts themselves. The interlocking geometry provides sufficient joint strength without requiring additional consumable materials like adhesives, thereby reducing material costs and eliminating the need for expensive auxiliary equipment.
3Adaptability or versatility
If complex designs with obstructing features are created, then design versatility is improved, but molding tool movement is blocked
Solution Approach 1:
The patent employs nested molding where the second molded part is injection molded directly onto the first molded part while the first part remains in the mold. This nested approach allows the molding tool to access and form complex three-dimensional features, recesses, and protrusions on both parts without requiring the tool to move around obstructing features, as the parts are formed in a hierarchical sequence within the same mold cavity.
Data Source
AI summary
Various embodiments may relate to an apparatus including a first molded part including a first portion extending along a first axis, and a second portion extending along a second axis having a different orientation to the first axis; and a second molded part, molded to the first molded part, and including a third portion positioned adjacent the first portion and defining a gap there between.