Insert Molded Split Injection Guide for Housing Joint Strength
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Solution Overview
Problem
Injection molding of insert molded splits in housings often results in non-uniform strength due to varying material injection velocities, leading to weaker areas prone to damage.
Innovation Solution
The use of an injection guide with a specific shape, such as tube, X-beam, or I-beam, is inserted between housing elements, guiding material injection to create strength points and weaker points that correspond to known stresses, with the option to include additional material with different orientations and fibers for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection molding is used to form insert molded splits, then housing elements can be joined efficiently, but the strength of the joint becomes non-uniform due to varying material injection velocities
Solution Approach 1:
The injection guide creates localized regions of controlled material flow velocity within the joint. By designing the guide geometry (tube, X-beam, I-beam, or cross-beam shapes), different sections of the joint receive material at optimized velocities, ensuring uniform strength distribution throughout the joint rather than having weak curved regions.
Solution Approach 2:
The injection guide acts as an intermediary component inserted between housing elements during molding. This guide structure mediates the material flow from the injection point to the joint regions, controlling velocity distribution and ensuring uniform material deposition and fiber alignment throughout the joint.
2Productivity
If material is injected at high velocity into non-edge areas, then faster molding is achieved, but weaker curved solidification forms resulting in damage-prone areas
Solution Approach 1:
The injection guide enables different injection velocities in different regions. Edge areas can receive higher velocity material for faster filling, while non-edge areas receive controlled velocity material that solidifies stronger, eliminating the weakness caused by uniformly high velocity injection.
3Strength
If injection guide shape is optimized for strength points, then joint strength is improved, but device complexity increases
Solution Approach 1:
The injection guide is divided into simple geometric segments (tube sections, X-beam elements, I-beam components, or cross-beam structures). These segmented forms are easier to manufacture and insert than complex custom guides, while still providing the necessary strength point distribution for optimized joint strength.
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 method produces insert molded splits with defined strength and weaker points, improving the structural integrity of the joints between housing elements by aligning material fibers and guide orientation with expected stresses, thereby enhancing the overall strength and durability of the housing assembly.
Implementation Method 1
an injection guide that extends between a first aperture of the first housing element and a second aperture of the second housing element
Implementation Method 2
the velocity at which material is injected into areas that do not border surface edges of the housing elements or other components may be higher than the velocity at which material is injected into areas to that do border such edges or other components
Implementation Method 3
the material may include fibers such as glass fibers, carbon fibers, metallic fibers, and so on. In cases where the material includes fibers, the strength points may correspond to fibers with a straighter orientation than fibers corresponding to the weaker points
Data Source
AI summary
A housing includes first and second housing elements coupled by an insert molded split. The insert molded split includes an injection guide that extends between a first aperture of the first housing element and a second aperture of the second housing element and material injection molded around the injection guide. A method for producing an insert molded split in a housing includes selecting an injection guide, inserting the injection guide into a first aperture of the first housing and the second aperture of the second housing, and injection molded material into and/or at least partially around the injection guide to form the insert molded split.