Linear Friction Joining for Dissimilar End-Surface Geometries
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Solution Overview
Problem
Existing linear friction-joining methods face challenges in forming good joints for materials of different sizes and shapes, as the appropriate joining conditions have not been clearly defined, leading to difficulties in optimizing the joining process.
Innovation Solution
The method involves setting the protrusion length of the member with the smaller end surface area to be equal to or greater than the upset distance, with a preference for higher thermal conductivity materials, and controlling the burr discharge direction and amount to ensure a strong and efficient joint, while using a fixing jig to prevent deformation and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear friction-joining is applied to materials of different sizes and shapes, then the versatility and adaptability of the joining method is improved, but the complexity of determining appropriate joining conditions increases significantly
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between protrusion length and upset distance for different material combinations. By defining that the protrusion length of the member with smaller end surface area should be equal to or greater than the upset distance, the patent transforms the complex optimization problem into a manageable parameter setting process based on material properties and geometry.
Solution Approach 2:
The patent employs preliminary action by pre-determining the protrusion length based on the upset distance before the actual joining process. This preliminary setup ensures that burr is properly discharged during joining, eliminating the need for extensive trial-and-error optimization during production and simplifying the overall process for dissimilar materials.
2Manufacturing precision
If the protrusion length is increased to ensure proper burr discharge, then the joining quality is improved, but the amount of material loss increases
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal parameter range where the protrusion length is set to be equal to or greater than the upset distance, but not excessively larger. This controlled parameter relationship ensures sufficient burr discharge for high-quality joints while minimizing unnecessary material removal, achieving balance between joining quality and material efficiency.
3Strength
If the joining process is optimized for each specific material combination, then the joining strength is improved, but the time required for process development and testing increases
Solution Approach 1:
The patent reduces process development time by establishing a systematic parameter setting method based on the relationship between protrusion length and upset distance. Instead of requiring extensive testing for each material combination, engineers can determine appropriate parameters by considering the member with smaller end surface area and its protrusion length relative to the expected upset distance, significantly accelerating the process optimization for dissimilar materials.
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 allows for the efficient formation of excellent joined portions between materials of varying sizes and shapes, ensuring strong and reliable linear friction-joined structures, even with dissimilar materials, by accurately controlling the joining conditions and burr discharge.
Implementation Method 1
repeatedly sliding the one member and the other member on the same trajectory to discharge burr from the interface to be joined
Implementation Method 2
linear friction-joining method for solid-phase joining metal materials
Data Source
AI summary
Provided are an easy and efficient linear friction-joining method with which it is possible to form an excellent joined section between materials being joined that are of different sizes and shapes, and a linear friction-joining structure obtained through the aforementioned friction-joining method. The present invention discloses a linear friction-joining method characterized by having a first step for bringing an end surface of one member into contact with an end surface of another member to form a joining interface, a second step for repeatedly causing the one member and the other member to slide on the same trajectory in a state in which pressure is applied roughly perpendicularly to the joining interface and eliminating burrs from the joining interface, and a third step for stopping the sliding and forming a joined surface, the linear friction-joining method also being characterized in that the end surface of the one member and the end surface of the other member have different surface areas, and in that the protrusion length of the member having the lesser surface area is set equal to or greater than the upset distance.