Speaker Module Housing Structure for Injection Shrinkage Control
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Solution Overview
Problem
Speaker module housings experience shrinkage during injection molding due to thinness in certain regions, leading to ineffective glue holding and increased risk of shrinkage.
Innovation Solution
Incorporating a plastic structure in the gate and fixed regions of the front shell, with varying thicknesses and orientations to stabilize the plastic flow and prevent rapid cooling, thereby enhancing the effective holding time and reducing shrinkage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the front shell is made with thin walls to reduce material usage and weight, then material consumption and weight are reduced, but the shell becomes prone to shrinkage during injection molding
Solution Approach 1:
The patent applies local quality by introducing a thickened section at the gate region of the front shell. This localized thickness increase specifically at the injection gate area allows the plastic to freeze in a controlled sequence, preventing shrinkage in the fixed region while maintaining thin walls elsewhere to reduce overall material consumption.
2Manufacturing precision
If the plastic thickness in the gate region is increased to prevent shrinkage, then shrinkage risk is reduced, but the holding time becomes too short due to quick freezing
Solution Approach 1:
The thickened section at the gate region acts as a preliminary thermal buffer. This localized thickness increase is designed to control the freezing sequence, ensuring that the gate region freezes after the fixed region, thereby extending the effective holding time for the fixed region without causing overall prolongation of the molding cycle.
3Manufacturing precision
If the front shell thickness is increased throughout to prevent shrinkage, then shrinkage risk is reduced, but the weight and material usage increase
Solution Approach 1:
The patent implements local quality by concentrating the thickness increase only at the gate region where it is most needed for controlling the freezing sequence and preventing shrinkage. The rest of the front shell maintains its original thin wall design, thereby preventing shrinkage while avoiding unnecessary weight increase throughout the entire housing.
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 plastic structure in the gate and fixed regions stabilizes the plastic flow, preventing ineffective glue holding and reducing shrinkage, ensuring a more robust and reliable speaker module housing.
Implementation Method 1
the plastic structure and the front shell are integrally injection-molded
Data Source
AI summary
Speaker module housing and speaker module, the speaker module housing includes front shell with accommodating cavity and back cover fixed to front shell and covering accommodating cavity. Front shell has gate region for injection molding and fixed region opposite to gate region and away from gate region. Thickness of part of front shell between gate region and fixed region is smaller than thickness of fixed region. Speaker module housing further includes plastic structure fixed in accommodating cavity. Plastic structure and front shell are integrally injection-molded, and plastic structure is located in gate region and/or fixed region. Plastic structure is arranged in gate region and/or fixed region of front shell, so that part of front shell located in gate region and fixed region has sufficient plastic thickness, which extends effective holding time of shrinkage position of front shell and reduce risk of shrinkage in fixed region of front shell.