Moving Electrode Expansion Forming for Buckling-Free Metal Pipes
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Solution Overview
Problem
Existing expansion forming apparatuses face challenges in preventing deformation and buckling of metal pipes during thermal expansion due to Joule heating, as the end portions are restrained, leading to potential forming failures.
Innovation Solution
The apparatus incorporates an electrode movement actuator that adjusts the position of electrodes along the extension direction of the metal pipe during heating, allowing for controlled thermal expansion without inducing stress and buckling, using a combination of hydraulic and pneumatic systems for precise movement and gripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the end portions of the metal pipe are restrained by fixed electrodes during Joule heating, then the pipe can be held in position for forming, but the thermal expansion causes stress and buckling leading to deformation
Solution Approach 1:
The electrode mounting unit is designed to move the electrode along the extension direction of the metal pipe in response to thermal expansion during heating. This dynamic adjustment allows the electrode to maintain contact with the pipe end while accommodating length changes, preventing buckling and deformation while preserving position stability
Solution Approach 2:
The system changes the position parameter of the electrode along the pipe's extension direction based on temperature-induced expansion. By dynamically adjusting the electrode position parameter, the system accommodates thermal effects while maintaining forming precision
2Manufacturing precision
If the electrode is moved along the extension direction of the metal material during heating, then deformation and buckling are suppressed, but the device complexity increases due to additional actuators
Solution Approach 1:
The electrode mounting unit serves multiple functions: it holds the electrode in position, allows movement along the extension direction to accommodate thermal expansion, and maintains electrical contact. This multi-functionality reduces the need for separate components, managing device complexity while achieving forming precision
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 solution effectively suppresses deformation and buckling, enabling successful expansion forming of curved or bent metal pipes by dynamically adjusting electrode positions based on temperature data, ensuring high forming quality and facilitating automation.
Implementation Method 1
an electrode that comes into contact with the metal material and performs energization heating
Implementation Method 2
the temperature of the metal pipe material with Joule heating by energization, and supplying high-pressure air into the metal pipe material
Data Source
AI summary
An expansion forming apparatus that shapes a metal material with a die includes an electrode that comes into contact with the metal material and performs energization heating, and an electrode mounting unit having an electrode movement actuator that moves the electrode along an extension direction of the metal material during heating.