Aluminum Alloy Strip Casting With In-Line Compression Cooling
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Solution Overview
Problem
Conventional processes for manufacturing aluminum-based alloy sheets are lengthy, energy-intensive, and require multiple steps, leading to increased inventories and scrap losses, while also failing to efficiently produce sheets with desired mechanical properties directly from molten aluminum.
Innovation Solution
A continuous casting process using a belt caster to produce a substantially solid aluminum-based alloy strip thinner than 10 mm, which is simultaneously cooled with a compression force and then cold-rolled without intermediate heat treatments, allowing for the direct production of aluminum-based alloy sheets with properties comparable to heat-treated sheets in fewer steps and less time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional batch processes with multiple heat treatment steps are used, then aluminum-based alloy sheets with desired mechanical properties can be produced, but the processing time is lengthy (several weeks) and energy consumption is high
Solution Approach 1:
The invention performs homogenization heat treatment during the casting process itself, before the alloy is fully solidified and before subsequent rolling operations. This preliminary action eliminates the need for separate post-casting homogenization steps, reducing total processing time from several weeks to a fraction of that time while achieving the same mechanical properties
Solution Approach 2:
The invention merges the homogenization heat treatment step with the casting process by maintaining the alloy at homogenization temperature during solidification and initial cooling. This combines two previously separate operations (casting and homogenization) into one integrated process, eliminating intermediate handling and reducing overall processing time
2Manufacturing precision
If conventional batch processes with extensive heat treatment steps are used, then aluminum-based alloy sheets can be produced, but energy consumption is high due to multiple heating and cooling cycles
Solution Approach 1:
The invention merges homogenization heat treatment with the casting process, eliminating the need for separate pre-heating, homogenization holding, and cooling cycles that would otherwise be required. This integration reduces the number of independent heating/cooling cycles from multiple separate operations to a single continuous thermal process
Solution Approach 2:
The invention maintains continuous heating and holding at homogenization temperature throughout the casting and initial solidification process, eliminating the intermittent heating and cooling cycles characteristic of batch processing. This continuous thermal action reduces energy losses associated with repeated temperature cycling
3Manufacturing precision
If conventional batch processes are used, then aluminum-based alloy sheets can be produced, but inventories of work in progress and final products must be maintained due to lengthy processing times
Solution Approach 1:
The invention enables continuous casting and processing of aluminum-based alloys, allowing material to flow through the process continuously rather than being processed in discrete batches that require storage. This continuity eliminates the need for large inventories of work-in-progress and finished goods that must be maintained during lengthy batch processing cycles
4Manufacturing precision
If conventional batch processes with multiple steps are used, then aluminum-based alloy sheets can be produced, but scrap losses occur at each stage of the batch process
Solution Approach 1:
The invention merges homogenization and casting operations, eliminating intermediate handling steps where material is transferred between different equipment and processes. This integration reduces opportunities for defects to develop and material to be rejected as scrap during transfers and intermediate storage
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 process reduces processing complexity, material handling, and costs by directly producing aluminum-based alloy sheets with mechanical properties meeting transport and beverage container industry standards, while minimizing energy consumption and eliminating the need for intermediate heat treatments.
Implementation Method 1
continuously casting and simultaneously cooling a substantially solid aluminum-based alloy strip thinner than about 10 mm
Implementation Method 2
with a compression force on a solidifying aluminum-based alloy strip in a range of about 2 to about 3000 pounds per linear inch of alloy strip width
Data Source
AI summary
A process for manufacturing an aluminum-based alloy sheet directly from a molten aluminum-based alloy is described. In a continuous caster, such as a belt-caster, and directly from the molten aluminum-based alloy, a substantially solid and substantially thin aluminum-based alloy strip, thinner than about 10 mm, is continuously cast and simultaneously cooled with a compression force on the solidifying aluminum-based alloy in a range of about 2 to about 3000 pounds per linear inch of alloy strip width. The substantially solid aluminum-based alloy strip can then be rolled, so as to obtain the aluminum-based alloy sheet. The process can include pulse heating the aluminum-based allowed sheet.