Brake Caliper Housing Alignment for Friction Stir Welding
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Solution Overview
Problem
Traditional methods of welding brake caliper housings using bolts require additional machining steps and complex jig designs for precise alignment, while traditional welding methods face mechanical strength concerns for complex shapes, especially in brake caliper housings with hydraulic caliper braking discs.
Innovation Solution
A brake caliper housing design featuring positioning pins and holes on the connecting surfaces of left and right shells allows precise alignment and fixation without jigs, facilitating friction stir welding by using a rotating shoulder tool to intermix softened metal materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional welding methods using welding materials and flux are used to weld the skin surfaces, then the welding process can be performed on complex three-dimensional shapes, but the mechanical strength of the weld joint is insufficient
Solution Approach 1:
The patent replaces traditional welding methods (which use welding materials and flux) with friction stir welding. This substitution uses mechanical friction and stirring action to create the weld joint, eliminating the need for welding materials and flux while producing superior mechanical strength in the weld joint.
Solution Approach 2:
The patent changes the fundamental parameters of the welding process by using friction-generated heat and mechanical stirring instead of arc heat and filler materials. This parameter change enables welding of complex three-dimensional shapes with significantly improved mechanical strength properties.
2Ease of manufacture
If the left and right shells are locked and fixed by bolts, then the assembly can be easily manufactured separately, but additional machining processes and special design considerations are required
Solution Approach 1:
The patent merges the separate bolted assembly into a single integrated friction stir welded structure. By combining the left and right shells through friction stir welding, the need for separate manufacturing, additional machining for threaded holes, and special bolt locking design considerations is eliminated.
Solution Approach 2:
The patent extracts and removes the bolt locking mechanism entirely, replacing it with a direct friction stir welded joint. This extraction eliminates the need for threaded holes, bolts, and associated design considerations while maintaining the structural integrity of the assembly.
3Manufacturing precision
If jigs and fixtures are designed for friction stir welding of complex three-dimensional shapes, then precise alignment can be achieved, but the jig and fixture designs become comparatively complex
Solution Approach 1:
The patent incorporates positioning holes and positioning pins directly into the shell structures before welding. This preliminary action of built-in positioning features eliminates the need for external jigs and fixtures, achieving precise alignment while simplifying the overall device complexity.
Solution Approach 2:
The shells themselves provide the positioning and alignment functions through integrated positioning holes and pins, making the system self-sufficient. This self-service approach eliminates the need for separate positioning devices, reducing device complexity while maintaining manufacturing precision.
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
Enables secure, precise alignment and clamping of shells for friction stir welding, reducing processing steps and mechanical strength concerns, and enhancing the stability of the weld joint.
Implementation Method 1
friction stir welding by using a rotating shoulder tool to intermix softened metal materials
Implementation Method 2
the friction stir welding, due to its superior mechanical properties compared to traditional welding methods
Data Source
AI summary
A brake caliper housing includes a left shell having a left connecting surface, and a right shell having a right connecting surface. The left connecting surface has at least one positioning hole, and the right connecting surface protrudes with at least one positioning pin inserted into the at least one positioning hole, such that the left connecting surface is abutted against and aligned with the right connecting surface. The right connecting surface is fixedly connected with the left connecting surface by a friction stir welding. As a result, during the friction stir welding, the left and right shells can be precisely aligned and joined together.