Embossed Cage Nut Structure to Prevent Paint Bonding
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Solution Overview
Problem
Conventional cage nuts in vehicle manufacturing face issues with adhesive bonding between the screw nut and nut cage after cathodic dip painting, leading to difficulties in manual screwing due to the paint's adhesive forces, which require manual force or hammer blows to loosen, compromising reliable function.
Innovation Solution
A cage nut design with spacers formed on the screw nut through an embossing process, reducing contact surfaces and preventing adhesive bonding by creating small, sharp burrs on the support surface, allowing paint to run off and minimizing adhesion between the screw nut and nut cage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screw nut has large contact surfaces with the cage axial stop, then the screw nut is stable and centered in the nut cage, but adhesive bonding occurs after cathodic dip painting making manual screwing difficult
Solution Approach 1:
The contact surface between the screw nut and cage axial stop is segmented into multiple small contact points through the formation of spacers and burrs, rather than having a large continuous contact surface. This segmentation reduces the total adhesive bonding area while maintaining positioning stability through distributed contact points.
Solution Approach 2:
The screw nut is given non-uniform surface properties through the embossing process, creating localized spacers and burrs with specific geometries. These local modifications create areas of reduced adhesion while maintaining overall structural integrity and positioning function.
2Reliability
If conventional cage nuts are used with large contact surfaces, then the screw nut is automatically centered by threading tip, but paint adheres between screw nut and counter surface requiring force to loosen
Solution Approach 1:
The embossing process that creates spacers and burrs, which initially appears to modify the screw nut structure, actually converts the harmful adhesive bonding into a beneficial non-sticking surface. The sharp burrs created by material displacement provide paint run-off paths, transforming the adhesive problem into a solution where paint naturally sheds.
3Ease of operation
If the screw nut is deformed to create spacers through embossing, then adhesive bond is reduced, but the forming process requires external force on circumferential edge
Solution Approach 1:
The spacers and burrs are formed on the screw nut during the production process through embossing, before the cathodic dip painting and assembly operations. This preliminary formation of the anti-adhesive surface structure eliminates the need for additional treatments or adjustments later in the manufacturing process.
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
Ensures reliable function of the cage nut by preventing adhesive bonding after cathodic dip painting, facilitating easier screwing and assembly processes, both manual and automated, by reducing adhesive forces through the embossing process.
Implementation Method 1
the spacer on the screw nut is produced in a forming process. In the forming process, the screw nut is deformed to create the spacer
Implementation Method 2
very small, sharp burrs can be produced by material displacement on the support surface, on which the screw nut rests within the nut cage. The cathodic dip paint between the screw nut and the nut cage can therefore run off after the dipping process
Data Source
AI summary
A cage nut for connection to a support element having a screw nut which is arranged in a captive and/or twist-proof manner in a nut cage which can be fastened to the support element and has play. The screw nut can be displaced between axial stops in the non-screwed state, and at least one spacer is formed on the screw nut front side facing toward an axial stop, via which the screw nut can be brought into contact with the axial stop, due to which an adhesive bond between the screw nut and the axial stop of the nut cage can be reduced. The spacer is produced in a forming process in which the screw nut is deformable to produce the spacer.