Adjustable Orbital Lathe for Kingpin Surface Roughness Control
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Solution Overview
Problem
Existing portable lathes for in-situ machining of fifth wheel kingpins fail to achieve desirable surface roughness due to mechanical vibrations caused by fixed cutting tool positioning and imprecise mechanical fits, which are critical for maintaining the security of the tractor-trailer connection.
Innovation Solution
A portable orbital lathe with adjustable cutting tool positioning mechanisms, including radial, orthogonal, and parallel movements, and a drive mechanism for rotating the cutting tool about the kingpin axis, allowing precise control over surface roughness by adjusting the cutting tool's position relative to the kingpin axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cutting tool is fixed in position relative to the kingpin centerline, then the machining process is simple, but mechanical vibrations occur that deteriorate surface roughness
Solution Approach 1:
The cutting tool positioning mechanism is transformed from a fixed static arrangement to a dynamic adjustable system. The tool can now be positioned at different radial distances from the kingpin centerline and at different angular orientations, allowing the operator to optimize the cutting path to minimize vibrations and achieve desired surface roughness while maintaining operational simplicity.
Solution Approach 2:
The invention introduces adjustable parameters for cutting tool positioning, specifically the radial distance from the centerline and the angular orientation. By varying these parameters, the machining process can be optimized to reduce mechanical vibrations and improve surface finish quality without significantly increasing device complexity.
2Ease of manufacture
If the cutting tool mounting arrangement uses imprecise mechanical fit, then the device is easier to assemble, but vibrations are generated that affect surface roughness
Solution Approach 1:
The mounting arrangement transitions from a rigid fixed-fit design to an adjustable mounting system that allows for precise positioning of the cutting tool. This dynamic adjustment capability enables the tool to be securely mounted at optimal positions, reducing vibrations while maintaining ease of assembly through standardized adjustment mechanisms.
3Manufacturing precision
If the kingpin is removed from the trailer for machining, then the surface roughness can be improved, but the downtime increases
Solution Approach 1:
The orbital lathe is designed to be a portable self-contained machining system that can be deployed directly at the trailer site. It includes its own support column for stabilization, adjustable positioning mechanisms for the cutting tool, and a drive mechanism for rotating the kingpin. This self-service capability enables high-precision machining to be performed in-situ without removing the kingpin from the trailer, thereby eliminating downtime while achieving desired surface roughness.
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 economical in-situ machining of fifth wheel kingpins with improved surface roughness, minimizing downtime and ensuring secure tractor-trailer connections by effectively removing material to achieve desired surface finishes.
Implementation Method 1
a drive mechanism for rotating the cutting tool about the pin axis to cause the cutting tool to remove material from the kingpin
Implementation Method 2
a first positioning mechanism for moving the cutting tool at least radially relative to the pin axis, a second positioning mechanism for rotating the cutting tool about a centerline axis generally orthogonal to the pin axis, and a third positioning mechanism for moving the cutting tool parallel to the centerline axis
Data Source
AI summary
An orbital lathe for in situ resurfacing a fifth wheel kingpin, having a pin axis, where the orbital lathe includes a support column generally axially aligned with the pin axis of the kingpin, a cutting tool mounted to the support column for rotation about the pin axis and having a first positioning mechanism for moving the cutting tool at least radially relative to the pin axis, a second positioning mechanism for rotating the cutting tool about a centerline axis generally orthogonal to the pin axis, and a third positioning mechanism for moving the cutting tool parallel to the centerline axis, and a drive mechanism for rotating the cutting tool about the pin axis to cause the cutting tool to remove material from the kingpin. The position of the cutting tool in relation to the centerline axis determines a surface roughness of the kingpin. Another embodiment of the orbital lathe and a method are also disclosed.