Sleeve Connection Piece With Cast Internal Thread Projections
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Solution Overview
Problem
Existing methods for producing connecting parts with internal threads are complex, requiring unscrewing cores and post-processing, which complicates the production process.
Innovation Solution
A connecting part with inwardly projecting projections formed by casting or 3D printing along a sleeve-shaped section, allowing connection to an external thread without forming continuous internal threads, using spaced projections that can be produced without turning cores or complex post-processing, and featuring bendable webs for additional functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If continuous internal threads are formed by casting with cores, then threaded connection capability is achieved, but production complexity increases due to core machining and removal
Solution Approach 1:
The continuous internal thread is segmented into multiple discrete projections distributed along the thread pitch. Each projection is formed independently by casting or 3D printing without requiring continuous core machining. The projections are arranged in several planes around the circumference, creating a functional equivalent to continuous threading while enabling simpler manufacturing through discrete feature formation.
Solution Approach 2:
Instead of forming a continuous internal thread by machining a core through the material and then removing it, the invention inverts the approach by directly forming discrete projections through casting or 3D printing. This eliminates the need for core insertion, machining, and removal operations, fundamentally reversing the traditional thread production sequence.
2Productivity
If spaced-apart projections are formed instead of continuous threads, then production complexity is reduced, but thread connection effectiveness must be maintained
Solution Approach 1:
The projections are strategically positioned at specific locations along the thread pitch rather than forming a continuous structure. Each projection is locally optimized to engage with corresponding features on the mating external thread. The distributed arrangement of projections in multiple circumferential planes provides sufficient engagement points to maintain connection reliability while reducing material usage and simplifying manufacturing.
Solution Approach 2:
The invention uses a partial thread formation approach where only discrete segments (projections) of the thread are created rather than the full continuous thread. This partial action is sufficient to achieve the required connection functionality, reducing manufacturing complexity and production time while maintaining adequate connection reliability for the application.
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
Enables efficient production of connecting parts suitable for threaded connections with high power transmission capabilities and flexible design options, such as expansion dowels or pipe screw connections, without the need for complex core removal or post-processing.
Implementation Method 1
a plurality of inwardly projecting projections produced by casting or 3D printing are integrally formed along at least one thread pitch on an inner side of the sleeve-shaped section
Implementation Method 2
a plurality of inwardly projecting projections produced by casting or 3D printing are integrally formed along at least one thread pitch on an inner side of the sleeve-shaped section
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A connecting part (1) comprises a cast body in which a sleeve-shaped section (2) is formed, wherein a plurality of inwardly projecting protrusions (4), produced by casting or 3D printing, are integrally formed along at least one thread on an inner surface of the sleeve-shaped section (2). This allows the connecting part to be manufactured in a plastic injection molding process or in an aluminum die casting process.