Variable-Wall Tube Extrusion Using an Adjustable Tapered Mandrel
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Solution Overview
Problem
Current metal extrusion techniques face challenges in producing materials with specified or variable wall thickness, particularly for lightweight metals like magnesium and aluminum, which require high energy consumption, complex processing, and often result in brittle intermetallic compounds, limiting their application in industries such as automotive and energy conversion.
Innovation Solution
Shear-assisted extrusion processes that combine rotational and axial forces to create extrudates with adjustable inner diameters, allowing for the production of materials with improved mechanical properties and reduced energy consumption by varying the mandrel position relative to the die, enabling the extrusion of hollow structures with specific or variable thickness without preheating, and using a die tool with a rotating face and tapered mandrel to control the extrusion aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metal extrusion techniques are used to produce extrudates with specified wall thickness, then manufacturing capability is provided, but energy consumption increases and processing complexity increases
Solution Approach 1:
The patent applies dynamics by making the mandrel position adjustable during the extrusion process. The mandrel can be moved axially relative to the die to vary the extrusion aperture dimensions in real-time, enabling dynamic control of wall thickness without requiring complex pre-heating or multi-step processing, thus reducing energy consumption while maintaining manufacturing precision
Solution Approach 2:
The patent changes the geometric parameters of the extrusion aperture by adjusting the mandrel position. By varying the axial position of the mandrel, the aperture dimensions change, which directly controls the wall thickness of the extrudate. This parameter change approach allows precise wall thickness control without increasing energy consumption or processing complexity
2Ease of manufacture
If conventional extrusion techniques are used for lightweight metals like magnesium and aluminum, then material processing is achieved, but brittle intermetallic compounds form and mechanical properties deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-positioning the mandrel at specific locations before extrusion begins. This allows the extrusion aperture to be pre-configured with optimal dimensions for the specific material being processed, preventing the formation of brittle intermetallic compounds from the outset and maintaining mechanical properties throughout the manufacturing process
Solution Approach 2:
The patent applies local quality by allowing different sections of the mandrel to have different positions relative to the die. This enables variation in the extrusion aperture dimensions along the length of the extrudate, optimizing local material flow and microstructure formation to prevent brittle intermetallic compound formation in critical areas while maintaining ease of manufacture
3Device complexity
If fixed aperture extrusion is used, then processing simplicity is maintained, but adaptability to produce variable wall thickness extrudates is limited
Solution Approach 1:
The patent transforms the static extrusion aperture into a dynamic one by enabling axial movement of the mandrel. This dynamic adjustment capability allows the same extrusion device to produce extrudates with varying wall thicknesses along their length or across different production runs, significantly improving adaptability while adding only minimal complexity to the processing system
Solution Approach 2:
The patent makes the extrusion device universal by enabling it to produce multiple types of extrudates with different wall thickness specifications using the same basic apparatus. By simply adjusting the mandrel position, the device can accommodate different product requirements without requiring tooling changes or complex reconfiguration, achieving multi-functionality with minimal added complexity
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 approach enables the production of extrudates with enhanced strength, corrosion resistance, and electrical conductivity at lower temperatures and forces, reducing production costs and energy consumption, and allows for the direct extrusion of metal wires, bars, or tubes from various feedstocks, including powders or flakes, with fewer processing steps.
Implementation Method 1
A portion of the billet material within the container can be extruded through the extrusion aperture in response to a rotational shearing force and an axial extrusion force
Implementation Method 2
Plasticized billet material can be directed through the extrusion aperture
Data Source
AI summary
An extrusion system can establish or adjust a position of a tapered, rotationally fixed mandrel with respect to a die orifice to adjustably establish or vary an extrusion aperture width therebetween. This, in turn, can adjustably establish or vary a wall thickness of a tubular extrusion product formed by the extrusion. A die tool can provide rotational shear force and axial compression force to plasticize a billet material for extrusion. The rotationally fixed mandrel can include a lateral outer dimension that varies along a longitudinal direction to vary an inner boundary of the extrusion aperture in response to movement of the rotationally fixed mandrel with respect to the die tool along the central longitudinal axis.