Tube Profiling via Reciprocating Roll Deformation
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Solution Overview
Problem
Existing methods for profiling metal tubes suffer from anomalous deformation of the leading end portion and require frequent changes in forming dies for different tube sizes and cross sections, leading to increased costs and production holdups.
Innovation Solution
A method using pairs of opposite rolls that are radially adjustable and powered to gradually deform the tube by alternating axial movement and rotation, allowing for flexible adaptation to various tube sizes and shapes without static radial load, thus minimizing waste and equipment changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional forming dies are used to profile metal tubes, then the tube cross section can be transformed to desired shapes, but anomalous deformation occurs at the leading end portion requiring removal of wasted material
Solution Approach 1:
The patent applies heating to change the physical state of the tube material, transforming it from a cold, rigid state to a hot, plastic state that allows uniform deformation without anomalous end deformation. This parameter change (temperature) enables the tube to be profiled without the leading end portion deformation problem that occurs in cold forming processes.
2Manufacturing precision
If forming dies are designed for specific tube sizes and cross sections, then precise profiling can be achieved, but frequent die changes are required for different specifications increasing production time
Solution Approach 1:
The patent employs universal forming rolls with adjustable spacing that can accommodate different tube sizes and cross-sectional shapes. Instead of requiring specific dies for each tube specification, the same set of rolls can be adjusted radially to profile various tube types, eliminating the need for frequent die changes and improving production efficiency.
Solution Approach 2:
The forming rolls are designed with radial adjustability, allowing their spacing to be dynamically changed according to the specific tube dimensions and desired cross-section. This dynamic adjustment capability enables a single forming system to handle multiple tube specifications without requiring physical die changes, thus maintaining both precision and productivity.
3Shape
If static radial load is applied by rolls to deform the tube, then profiling can be achieved, but ovalization occurs and transverse stability is compromised
Solution Approach 1:
The patent employs alternating reciprocating motion of the rolls, applying radial load in periodic cycles rather than continuous static pressure. The rolls move forward to apply deformation, then retract to allow the tube to recover and maintain stability. This periodic action prevents ovalization and maintains transverse stability while achieving the desired cross-sectional transformation.
Solution Approach 2:
The patent combines heating (changing temperature parameter) with periodic reciprocating motion to achieve uniform plastic deformation. The heated tube material becomes more plastic and deformable, allowing the periodic roll action to reshape the cross-section without causing instability or ovalization that would occur with cold static loading.
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
This method effectively profiles metal tubes with reduced waste and equipment costs by ensuring even deformation and adaptability to different sizes and shapes, while maintaining tube stability and efficiency.
Implementation Method 1
which is heated in order to allow radial penetration of the rolls
Implementation Method 2
the radial load applied by the rolls to the tube at any step-adjustment of the gap is a static radial load, which would involve ovalization of the tube
Implementation Method 3
The tube is then reciprocated between the rolls to obtain deformation of the aforementioned intermediate portion of the tube
Data Source
AI summary
An embodiment of a method for profiling a tube of given length, whereby, after inserting the tube between at least one pair of rolls having respective coplanar, parallel axes of rotation crosswise to the tube, the rolls are moved onto the tube and pressed gradually against the tube, which, at the same time, is moved axially back and forth.