Finned Spindle Liner Extrusion for Vibration Damping
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Solution Overview
Problem
Conventional spindle liners for metal turning machine tools are costly to manufacture, heavy, and difficult to insert and remove, leading to increased wear and vibration due to their mass and design.
Innovation Solution
A finned spindle liner made from materials like high density polypropylene or PVC, with axially oriented fins that reduce the spindle diameter without increasing rotational inertia, allowing for easier insertion and removal and providing vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cast or machined spindle liners are used, then manufacturing precision and structural integrity are improved, but production cost and manufacturing time increase
Solution Approach 1:
The patent changes the manufacturing method from casting or machining to extrusion, and changes the material from metal/urethane to thermoplastic polymer. This parameter change enables cost-effective production while achieving the required precision through the extrusion process itself, eliminating expensive post-cast machining operations
Solution Approach 2:
The patent replaces traditional mechanical manufacturing methods (casting, machining) with an extrusion process that forms the liner directly in its final shape. This substitution eliminates the need for expensive post-processing operations while maintaining manufacturing precision through process control
2Strength
If conventional solid spindle liners are used, then structural support is improved, but mass and moment of inertia increase
Solution Approach 1:
The patent segments the liner structure into a series of longitudinal ribs or fins extending along the liner length. This segmentation provides structural support through the distributed rib structure while significantly reducing the overall material mass compared to a solid liner, thereby reducing the moment of inertia of the spindle assembly
Solution Approach 2:
The patent uses a thin-walled extruded polymer structure with longitudinal ribs that provides sufficient structural support through its geometry rather than material mass. The thin-film nature of the extruded liner reduces weight while maintaining the necessary support function
3Stability of the object's composition
If annular bearings or O-rings are used in conventional liners, then concentric rotation support is improved, but insertion and removal difficulty increase
Solution Approach 1:
The patent extracts the separate bearing or O-ring components from the liner structure and integrates the concentric rotation support function directly into the extruded liner body through the longitudinal rib structure. This eliminates the need for separate insertion of bearing components and simplifies the overall assembly process
Solution Approach 2:
The patent merges the functions of structural support, concentric rotation guidance, and vibration damping into a single integrated extruded liner structure with longitudinal ribs. This combination eliminates the need for separate components and simplifies insertion and removal operations
4Strength
If heavy conventional liners are used, then structural rigidity is improved, but spindle wear and machine tool stress increase
Solution Approach 1:
The patent changes the material parameter from dense metal or urethane to thermoplastic polymer with lubricating additives, and changes the structural parameter from solid to ribbed configuration. This provides sufficient rigidity through the rib geometry while the polymer material reduces spindle wear through its inherent lubricating properties
Solution Approach 2:
The patent uses a polymer liner that can be easily replaced when worn, rather than attempting to make the liner last indefinitely. The low cost of the extruded polymer liner allows for periodic replacement, and the reduced mass minimizes spindle wear during its service life
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
The finned design reduces production costs, minimizes mass, simplifies insertion and removal, and enhances rotational speed by damping vibrations, while maintaining concentric rotation of stock pieces with the spindle.
Implementation Method 1
The fins also provide vibration damping, permitting the spindle to rotate more quickly.
Implementation Method 2
extruding a material such as high density polypropylene, polyvinyl chloride ("PVC"), nylon lubricated with molybdenum disulfide or the like
Data Source
AI summary
A spindle liner including an axial sleeve having an axial length and an inner bore for receiving a stock piece is provided. The spindle liner further includes fins extending radially outward from the axial sleeve for supporting the axial sleeve within a spindle. Each fin extends along the axial length of the spindle liner. The spindle liner may be extruded from a high density material such as high density polypropylene, polyvinyl chloride or nylon and molybdenum disulfide. The spindle liner may further include an retaining flange attached to a distal end of the spindle liner.