Composite Profile Sliding Guide for Thermal Deformation
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Solution Overview
Problem
Composite profiles for doors, windows, and facade elements face issues with thermal expansion and deformation due to differing coefficients of linear expansion between metal and plastic materials, leading to unwanted movements and leaks, which existing shear-resistant designs fail to adequately address, especially under extreme weather conditions.
Innovation Solution
A composite profile design featuring a smooth surface section on a wire that allows the insulating web to slide, creating a sliding guide with defined sliding properties, which helps mitigate both manufacturing and weather-related deformations by setting the coefficient of friction and maintaining a shear-proof connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a shear-resistant connection is used between metal and plastic components, then structural stability is improved, but thermal deformation and warping occur due to different expansion coefficients
Solution Approach 1:
The connection between metal and plastic components is designed to be dynamically adaptable through controlled friction. The friction force adjusts automatically based on thermal expansion differences, allowing the components to move relative to each other when expansion occurs while maintaining connection under normal conditions. This resolves the contradiction by making the connection neither fully rigid nor completely loose, but dynamically responsive to thermal conditions.
Solution Approach 2:
The friction coefficient is carefully selected and controlled as a key parameter to balance shear resistance and thermal accommodation. By optimizing the friction parameter, the connection provides sufficient shear strength for structural stability while allowing controlled movement to accommodate thermal expansion, preventing warping and deformation.
2Shape
If a movable connection is used to accommodate thermal expansion, then thermal deformation is reduced, but shear strength and structural stability are compromised
Solution Approach 1:
The friction coefficient serves as a controlling parameter that balances the two opposing requirements. By selecting an appropriate friction value, the connection provides sufficient resistance to maintain structural stability while allowing controlled movement to accommodate thermal expansion, thus resolving the contradiction between stability and deformation resistance.
Solution Approach 2:
The connection utilizes friction between different materials (metal and plastic) with different thermal expansion coefficients. The friction-based connection allows these dissimilar materials to be joined while accommodating their inherent differences in thermal behavior, enabling both structural integrity and thermal accommodation.
3Manufacturing precision
If a form-fitting connection is used during manufacturing, then manufacturing precision is improved, but unwanted deformations occur under extreme weather conditions
Solution Approach 1:
The connection transitions from a static form-fitting design to a dynamic friction-based connection that can adapt to changing conditions. During manufacturing, the friction provides sufficient holding force for precise assembly, but under extreme weather conditions, the friction allows controlled movement to prevent deformation, thus resolving the contradiction between manufacturing precision and weather resistance.
4Strength
If friction is increased to prevent sliding, then shear strength is improved, but thermal expansion accommodation is reduced
Solution Approach 1:
The friction coefficient is optimized as a key parameter to achieve the right balance. Sufficient friction is maintained to provide shear strength and prevent unwanted sliding under normal conditions, while allowing controlled movement when thermal expansion forces exceed the friction threshold, thus accommodating thermal expansion without sacrificing shear 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 design effectively reduces unwanted deformations and leaks by allowing controlled movement between metal and plastic components, maintaining structural integrity and thermal insulation while being simple and cost-effective to integrate into production processes.
Implementation Method 1
the wire has a smooth surface section on which the respective web comes to rest in order to define the respective end section of the insulating web slidably... the web forms a first contact surface A1 on the smooth surface section of the wire and a remaining surface of the wire on the insulating web forms a second bearing surface A2 and the surface pressures p of the bearing surfaces A1 and A2 that are created by the assembly of the components are in the ratio pA1 ≥ pA2
Implementation Method 2
different weather-related thermal expansion of the inner and outer shells of a frame profile results in a bimetal effect... differently large coefficients of linear expansion of the materials used for the metal profiles and the insulating webs usually made of a plastic material
Data Source
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AI summary
A composite profile (4) for doors (1), windows or facade elements comprising a first metal profile (13) and at least one insulating web (17), wherein the first metal profile (13) is connected in at least one insulating web zone to the one or more insulating webs (17), and the insulating web(s) (17) each has at least one end section (24).having, wherein at least one of the end sections (24) of each insulating web (17) engages in a corresponding groove (25) formed by the first metal profile (13), wherein the groove (25) is formed by a bead (29) and a web (26), wherein the web (26) rests on the circumference of a wire (28) inserted into the respective insulating web (17), is characterized in that the wire (28) has a smooth surface section (30) on which the respective web (26) rests to slidably fix the respective end section (24) of the insulating web (17), wherein the web (26) forms a first bearing surface (A1) on the smooth surface section (30) of the wire (28) and a residual surface of the wire (28) on the insulating web (17) forms a second bearing surface (A2), and which are formed by mounting the components (13, 17, 28) forming surface pressures p of the bearing surfaces A1 and A2 in the ratio pA1 ≥ pA2.