Babbitt Bearing Shoe Laser Cladding to Prevent Undercut
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Solution Overview
Problem
Existing methods for repairing Babbitt metal bearing shoes face issues such as low bonding strength, undercut, and decladding due to overheating during laser cladding, requiring complete removal of the original Babbitt metal layer, leading to material waste and high maintenance costs.
Innovation Solution
A method for laser cladding that retains the original Babbitt metal layer and uses metal plates to prevent undercut and decladding by planning a quadrilateral cladding range, setting laser scanning directions, and employing metal plates for cooling, with specific process parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the original Babbitt metal layer is completely removed for repair, then the bonding strength of the new layer is improved, but material consumption increases and maintenance costs rise
Solution Approach 1:
The patent applies local quality by selectively removing only the defective portions of the Babbitt metal layer (areas with porosity, needle holes, and air holes) rather than completely removing the entire layer. This localized removal approach preserves the sound original Babbitt metal, reducing material waste while ensuring that only necessary areas are repaired with new material.
Solution Approach 2:
The patent implements preliminary action by performing selective machining removal of defective areas before laser cladding. This preparatory step removes harmful defects while retaining the original Babbitt metal layer, creating an optimized substrate that improves bonding strength of the subsequent cladding layer without requiring complete removal of the original material.
2Loss of substance
If laser cladding is performed on the original Babbitt metal layer, then material consumption is reduced, but undercut and decladding occur due to overheating
Solution Approach 1:
The patent applies the taking out principle by extracting (removing via machining) the defective portions of the Babbitt metal layer before laser cladding. By removing porosity, needle holes, and air holes in advance, the patent eliminates the sources that would cause undercut and decladding during laser processing, thereby maintaining manufacturing precision while preserving material.
Solution Approach 2:
The patent implements preliminary action by performing selective machining removal of defective areas before laser cladding. This preparatory step removes harmful defects while retaining the original Babbitt metal layer, creating an optimized substrate that improves bonding strength of the subsequent cladding layer without requiring complete removal of the original material.
3Loss of substance
If the original Babbitt metal layer is retained for local repair, then material consumption and maintenance costs are reduced, but the bonding strength may be compromised
Solution Approach 1:
The patent applies local quality by selectively removing only the defective portions of the Babbitt metal layer (areas with porosity, needle holes, and air holes) rather than completely removing the entire layer. This localized removal approach preserves the sound original Babbitt metal, reducing material waste while ensuring that only necessary areas are repaired with new material.
Solution Approach 2:
The patent implements preliminary action by performing selective machining removal of defective areas before laser cladding. This preparatory step removes harmful defects while retaining the original Babbitt metal layer, creating an optimized substrate that improves bonding strength of the subsequent cladding layer without requiring complete removal of the original material.
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
Reduces material consumption and maintenance costs by allowing local repair without complete removal, minimizing undercut and decladding, and enhancing repair efficiency.
Implementation Method 1
a laser additive manufacturing method
Implementation Method 2
Because a melting point of the Babbitt metal is only over 200° C., a groove or a recess is easy to be generated on an edge of a repairing area during cladding
Implementation Method 3
uses metal plates for cooling
Data Source
AI summary
Disclosed is a method for repairing a Babbitt metal bearing shoe by laser cladding, metal plates are placed around a cladding range, thereby assisting in cooling a cladding area and accelerating heat conduction of a base material in the cladding area, and since the metal plates protrude out of a surface of the cladding area to form a step-like shape, thereby avoiding a phenomenon of an undercut of an edge side cladding channel; and by planning an area to be repaired, the cladding area is limited in a range as small as possible, and in addition, the metal plates are arranged around the cladding area for cooling, thereby avoiding a phenomenon of decladding of an original Babbitt metal layer caused by overheating deformation.