Ductile Interlayer for Silicon Part Assembly
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Solution Overview
Problem
Current assemblies of silicon-based parts with metal components are prone to breakage during assembly due to inadequate bonding or insufficient binding, making the process expensive and unreliable.
Innovation Solution
An adhesive-free assembly method using an intermediate part made of a ductile material, which is elastically and plastically deformed to securely attach a silicon-based part to a metal member without applying destructive axial stress, utilizing pierced holes and slots to distribute radial stress uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding is used to secure silicon-based parts to metal members, then the assembly is secured, but the process becomes expensive and requires extremely delicate application
Solution Approach 1:
An intermediate part made of ductile material (such as metal) is introduced between the silicon-based part and the metal member. This intermediate part serves as a mediator that can be deformed to create a secure mechanical connection, replacing the need for delicate bonding processes. The intermediate part includes deformation means that engage with both the silicon part and the metal member, providing a reliable connection through mechanical interlocking rather than chemical bonding.
2Productivity
If conventional assembly methods are used for silicon parts, then assembly is achieved, but the silicon part breaks during assembly due to inadequate bonding or insufficient binding
Solution Approach 1:
The material properties of the intermediate part are specifically selected to be ductile, allowing it to undergo plastic deformation during assembly. This parameter change in material behavior enables the intermediate part to absorb assembly stresses without breaking the fragile silicon-based part. The deformation means of the intermediate part can yield and conform to the silicon part's aperture, creating a secure connection that protects the silicon part from breakage.
3Force
If axial stress is applied during assembly of silicon parts, then assembly force is achieved, but destructive stress is applied to the silicon part
Solution Approach 1:
The assembly mechanism transitions from axial loading to radial loading through the deformation means of the intermediate part. Instead of applying assembly force directly along the axial direction (which would stress the silicon part), the intermediate part's deformation means expand radially to create interference fits and mechanical engagement. This dimensional change in the assembly mechanism allows strong bonding forces to be generated in the radial direction while keeping axial stresses on the silicon part minimal and non-destructive.
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 method securely attaches the silicon-based part to the metal member without breaking it, ensuring a non-destructive assembly process and preventing relative movements, while maintaining precision and adaptability to manufacturing dispersions.
Implementation Method 1
the intermediate part has a hole for receiving said member, in that the part includes pierced holes forming elastic deformation means distributed around the aperture and in that the elastically and plastically deformed intermediate part radially grips said member and stresses the elastic deformation means of the part
Implementation Method 2
the elastically and plastically deformed intermediate part radially grips said member and stresses the elastic deformation means of the part
Implementation Method 3
The shape of the external wall of the intermediate part substantially matches the aperture in the part so as to exert a substantially uniform radial stress on the wall of the part surrounding said aperture
Data Source
AI summary
An assembly of a member, made of a first material in an aperture of a part, made of a second material having no plastic domain, using an intermediate part made of a third material, mounted between the member and the part. The intermediate part includes a hole for receiving the member. The part includes pierced holes forming a deformation mechanism distributed around the aperture thereof. The elastically and plastically deformed intermediate part radially grips the member and stresses the elastic deformation mechanism of the part so as to secure the assembly in a manner that is not destructive for the part. Such an assembly can for example be used in the field of timepieces.