Press Joint Embossing Coating Dissimilar Materials
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Solution Overview
Problem
Press connections between dissimilar materials face issues such as reduced strength, increased electrical resistance, and reduced service life due to differing material properties, thermal expansion coefficients, and potential for microcracking, especially in crimp connectors where radial displacements and oxide formation occur.
Innovation Solution
The solution involves designing the joining partners with a smooth surface quality and applying a coating material to enhance the contact surface, specifically using embossing to create an intermetallic phase during pressure welding, which increases the effective contact area and reduces corrosion, while ensuring the embossing depth and force match the material's mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If press connections are made between dissimilar materials, then mechanical connection is achieved, but joint strength is reduced due to different plastic deformation components
Solution Approach 1:
A coating layer is applied to at least one joining surface to act as an intermediary between dissimilar materials. This coating prevents direct contact between incompatible materials, reducing galvanic corrosion and improving joint strength by enabling more effective plastic deformation without material incompatibility issues.
Solution Approach 2:
The surface properties of the joining partners are modified through coating application and embossing processes. These parameter changes in surface roughness, hardness, and chemical composition enable better mechanical interlocking and reduce the negative effects of material dissimilarity on joint strength.
2Strength
If embossing is applied to create plastic deformation components, then mechanical interlocking is improved, but microcracking occurs in brittle materials
Solution Approach 1:
The embossing process creates localized plastic deformation zones with specific geometric patterns on the joining surface. This local quality change provides mechanical interlocking features while controlling the deformation to avoid propagating cracks in brittle materials by concentrating strain in specific embossed regions.
Solution Approach 2:
The joining surfaces are prepared in advance through coating application and embossing before the actual pressing operation. This preliminary action creates a more ductile surface layer and mechanical interlocking features that accommodate deformation without causing microcracking during the pressing process.
3Strength
If joining surfaces have rough surface quality, then mechanical interlocking is enhanced, but electrical resistance increases due to oxide formation and reduced contact area
Solution Approach 1:
A conductive coating layer is applied to the joining surfaces to serve as an intermediary that maintains electrical conductivity while providing a surface suitable for mechanical interlocking. The coating prevents oxide formation and ensures low electrical resistance even when embossing creates surface irregularities for mechanical bonding.
4Adaptability or versatility
If dissimilar materials are joined, then design flexibility is improved, but service life is reduced due to differing thermal expansion coefficients
Solution Approach 1:
The coating layer acts as a buffer between dissimilar materials with different thermal expansion coefficients. This intermediary layer accommodates thermal stress differences, preventing crack propagation and maintaining connection integrity over extended service life despite thermal cycling.
Solution Approach 2:
The surface properties and thickness of the coating layer are optimized to accommodate thermal expansion differences. By controlling coating parameters such as thickness, elasticity, and adhesion strength, the connection can withstand repeated thermal cycles without failure, extending service life while maintaining design flexibility.
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 approach enhances the mechanical and electrical connection strength, reduces electrical resistance, and increases the service life by promoting a stable intermetallic phase and effective surface bonding, even under varying thermal loads and material differences.
Implementation Method 1
an embossing with plastic deformation components
Implementation Method 2
pressure welding takes place at the interfaces, so that an intermetallic phase is formed
Data Source
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AI summary
The invention relates to a press fit for a plug connector component, comprising a first joining surface on a first joining partner and at least a second joining surface on at least a second joining partner, wherein the connection at at least one partially common contact surface of the joining surfaces is formed by an embossing with plastic deformation components, wherein the materials of the joining partners have different material properties and at least one joining surface is coated at least partially with a coating material. The invention further relates to a method for producing a press fit for plug connector components and such a plug connector component.