Pipe Segment Fusion Using a Rotating Central Workpiece
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Solution Overview
Problem
Existing methods for fusing or bonding pipe segments are not feasible when only one segment can be rotated or when space is limited, as they require both segments to be rotated or have ample space for alignment.
Innovation Solution
A system that secures first and second metal workpieces to a central metal workpiece using clamps, heating elements, and a rotating central gear to heat and align the workpieces, allowing them to bond at hot working temperatures while the central workpiece rotates, and then cool for bonding, without the need for extensive space or axial movement of all workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both pipe segments are rotated for fusion, then bonding quality is improved, but device complexity and space requirements increase
Solution Approach 1:
Instead of rotating both pipe segments as in conventional fusion methods, this invention rotates only the central mandrel while keeping the outer pipe segment stationary. The inner pipe segment is rotated relative to the central mandrel during fusion. This inversion of the rotation approach reduces device complexity and space requirements while maintaining bonding quality through controlled relative motion between the pipe segments.
Solution Approach 2:
The central mandrel serves as an intermediary component that enables fusion without requiring rotation of both pipe segments. By rotating the central mandrel and controlling the rotation of the inner pipe segment relative to it, the system achieves effective fusion in a constrained configuration, reducing the overall device complexity and space requirements compared to conventional dual-rotation systems.
2Manufacturing precision
If ample space is provided for pipe alignment, then fusion accuracy is improved, but adaptability to confined spaces deteriorates
Solution Approach 1:
The invention employs a nested configuration where the inner pipe segment is positioned within the central mandrel, and the outer pipe segment surrounds the assembly. This nested arrangement enables precise alignment and fusion control within a compact footprint, allowing the system to achieve high fusion accuracy while adapting to confined spaces that would not accommodate conventional spread-out alignment methods.
Solution Approach 2:
The system transitions from a conventional linear alignment approach to a radial/dimensional arrangement where pipe segments are positioned in different spatial dimensions around the central mandrel. This dimensional reconfiguration enables accurate fusion control without requiring extensive linear space, thereby improving adaptability to confined spaces while maintaining manufacturing precision.
3Reliability
If axial movement of all workpieces is required, then fusion completeness is improved, but ease of operation deteriorates
Solution Approach 1:
The fusion process is segmented into controlled rotation phases: the central mandrel rotates independently, and the inner pipe segment rotates relative to the mandrel. This segmentation of rotational motion eliminates the need for axial movement of all workpieces while ensuring complete fusion through staged, controlled relative motion. The segmented approach simplifies operation by allowing independent control of each component's rotation.
Solution Approach 2:
The system employs dynamic rotational control where the central mandrel and inner pipe segment rotate at different speeds and phases. This dynamic approach ensures complete fusion coverage without requiring axial movement, as the differential rotation creates sufficient relative motion between surfaces. The dynamic control simplifies operation by eliminating the need for complex axial positioning mechanisms.
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 bonding of metal workpieces in limited spaces without heat-affected zones, achieving uniform microstructures through partial plastic deformation and recrystallization, even when only one workpiece can be rotated or when space is constrained.
Implementation Method 1
Heating elements heat opposed ends of the first metal workpiece and the central metal workpiece, and opposed ends of the second metal workpiece and the central metal workpiece, to a hot working temperature
Implementation Method 2
achieving uniform microstructures through partial plastic deformation and recrystallization
Implementation Method 3
achieving uniform microstructures through partial plastic deformation and recrystallization
Data Source
AI summary
A system for securing first and second metal workpieces to a central metal workpiece located therebetween. The system includes clamps to secure the first and second metal workpieces in coaxial alignment with the central metal workpiece, which is rotatable about its axis. Heating elements heat opposed ends of the first metal workpiece and the central metal workpiece, and opposed ends of the second metal workpiece and the central metal workpiece, to a hot working temperature. While the opposed ends are at the hot working temperature, the opposed end of the first metal workpiece is urged against the end opposed thereto of the rotating central metal workpiece, while the central metal workpiece rotates. At the same time, the rotating central metal workpiece's end opposed to the second metal workpiece is engaged with the opposed end of the second metal workpiece. The workpieces are allowed to cool, for bonding the opposed ends.