Integral Ferrule Grounding for Shielded Cable Automation
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Solution Overview
Problem
Existing methods for forming a grounding arrangement on shielded cables are cumbersome, particularly in automating the assembly of ferrules and accommodating varying wire gauges, leading to increased production time and costs.
Innovation Solution
A method involving inner and outer ferrules with crimp wings and a bypass wing arrangement, formed by punching and stamping sheet stock, allows for automated production and easy assembly on shielded cables, accommodating multiple gauge sizes by crimping the ferrules around the conductive and core insulation layers to securely capture the conductive shield layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If deep drawing or machining processes are used to manufacture loose-piece ferrules, then manufacturing precision is improved, but device complexity and manual assembly requirements increase
Solution Approach 1:
The inner ferrule and outer ferrule are merged into a single integral structure formed from a single piece of sheet metal. This eliminates the need for separate manufacturing and assembly operations while maintaining the functional separation between inner and outer ferrules through the integral design with cutouts and flanges.
Solution Approach 2:
The integral ferrule structure serves multiple functions simultaneously: the inner ferrule portion provides grounding connection, the outer ferrule portion provides structural support and insulation, and the integrated design enables automated assembly while accommodating various cable sizes through adjustable features.
2Ease of manufacture
If inner and outer ferrules are integrally formed from sheet metal, then ease of manufacture and automation are improved, but positioning difficulty and adaptability to single gauge size worsen
Solution Approach 1:
The integral ferrule is segmented into distinct functional zones: an inner ferrule portion for grounding connection, an outer ferrule portion for structural support, and intermediate features like cutouts and flanges. This segmentation allows each zone to be optimized for its specific function while maintaining overall adaptability to different cable configurations.
Solution Approach 2:
The integral ferrule incorporates dynamic features such as adjustable flanges and cutouts that can be positioned or configured to accommodate different cable diameters and shield layer thicknesses. This dynamic adaptability allows a single ferrule design to work across multiple cable gauge sizes without requiring precise pre-positioning.
3Manufacturing precision
If manual assembly of ferrules is required, then manufacturing precision is maintained, but productivity and production time decrease
Solution Approach 1:
By combining the inner and outer ferrules into a single integral component, the assembly process is simplified to a single insertion operation rather than multiple separate assembly steps. This merging enables automated placement while maintaining the precise positioning that would otherwise require manual assembly.
Solution Approach 2:
The integral ferrule design features self-aligning and self-positioning characteristics through its geometric configuration, including tapered portions and complementary shapes that guide automatic placement into the correct position on the cable assembly, eliminating the need for complex alignment procedures.
4Productivity
If automated production is implemented, then productivity is improved, but manufacturing complexity and positioning precision worsen
Solution Approach 1:
The ferrule design incorporates self-aligning features such as tapered leading edges and complementary geometric shapes that automatically guide the ferrule into correct positioning during automated insertion. This self-positioning capability eliminates the need for complex automated alignment systems while maintaining high positioning precision.
Solution Approach 2:
The integral ferrule is pre-formed with built-in positioning features and geometric constraints during manufacturing that ensure correct orientation and placement. This preliminary preparation of positioning features allows automated systems to simply insert the ferrule without requiring complex sensing or adjustment mechanisms.
Data Source
Figure 1~3
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Figure 10~16
AI summary
A method is provided for forming a grounding arrangement (12) on a shielded cable (10) which includes a conductive core (14), a core insulation layer (18), a conductive shield layer (20), and an outer insulation layer (22). An inner ferrule (24) is positioned adjacent an end portion of the conductive shield layer (20) that has been exposed, the inner ferrule (24) is crimped around the core insulation layer (18), and the end portion is folded over the inner ferrule (24) to radially surround the inner ferrule (24). An electrically conductive outer ferrule (26) is positioned radially adjacent to the end portion and the outer ferrule (26) is crimped radially around the inner ferrule (24) to capture the end portion radially between the inner ferrule (24) and the outer ferrule (26), thereby fixing the outer ferrule (26) in electrical contact with the conductive shield layer (20).