Bimetallic Raw Wire Roll Profiling for Stable Mixing Ratio
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Solution Overview
Problem
Existing methods for producing bimetallic wires with different yield strengths, such as nickel and aluminum, face challenges in maintaining a consistent mixing ratio and preventing elongation issues during roll forming, leading to unpredictable wire composition and deformation difficulties.
Innovation Solution
The method involves separating the deformation process into two groups of roll stands, where the metal strip with higher yield strength is preformed into a trough shape before integrating the lower yield strength strip, allowing for controlled clamping and reduced elongation, ensuring a consistent cross-sectional composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple metal strips with different yield strengths are processed together from the start in roll forming, then the production efficiency is improved, but the mixing ratio becomes unpredictable and elongation issues occur
Solution Approach 1:
The roll forming process is segmented into two distinct phases: Phase 1 processes only the first metal strip (higher yield strength) through 5-7 roll stands to create a preform, while Phase 2 introduces the second metal strip (lower yield strength) through additional roll stands to complete the final profile. This segmentation prevents the mixing ratio problems and elongation issues that occur when both strips are processed simultaneously from the start.
Solution Approach 2:
The first metal strip is preliminarily formed into a preform with a trough-shaped cross-section before the second metal strip is introduced. This preliminary action creates a stable structural base that prevents the softer second strip from elongating excessively during subsequent forming operations, thereby maintaining consistent mixing ratio throughout the wire.
2Ease of manufacture
If the softer metal strip is introduced early in the roll forming process, then the deformation process is simplified, but the strip elongates excessively and may be pushed out or form folds
Solution Approach 1:
The first metal strip is preliminarily formed into a preform with a trough-shaped cross-section before the second metal strip is introduced. This preliminary action creates a stable structural base that prevents the softer second strip from elongating excessively during subsequent forming operations, thereby maintaining consistent mixing ratio throughout the wire.
Solution Approach 2:
The roll forming process is segmented into two distinct phases: Phase 1 processes only the first metal strip (higher yield strength) through 5-7 roll stands to create a preform, while Phase 2 introduces the second metal strip (lower yield strength) through additional roll stands to complete the final profile. This segmentation prevents the mixing ratio problems and elongation issues that occur when both strips are processed simultaneously from the start.
3Loss of time
If both metal strips are processed together from the beginning, then the process time is reduced, but the different yield strengths cause relative movements and elongation differences
Solution Approach 1:
The roll forming process is segmented into two distinct phases: Phase 1 processes only the first metal strip (higher yield strength) through 5-7 roll stands to create a preform, while Phase 2 introduces the second metal strip (lower yield strength) through additional roll stands to complete the final profile. This segmentation prevents the mixing ratio problems and elongation issues that occur when both strips are processed simultaneously from the start.
Solution Approach 2:
The first metal strip is preliminarily formed into a preform with a trough-shaped cross-section before the second metal strip is introduced. This preliminary action creates a stable structural base that prevents the softer second strip from elongating excessively during subsequent forming operations, thereby maintaining consistent mixing ratio throughout the wire.
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 prevents excessive elongation and maintains a stable mixing ratio, enabling the production of bimetallic wires with improved dimensional stability and suitability for thermal spraying applications.
Implementation Method 1
the yield point is exceeded a change in shape remains, i.e. an extension in a tensile test
Data Source
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AI summary
The invention relates to a method for producing a raw wire (7) from a first metal strip (2) and at least one further metal strip (4) by roll profiling, in particular wherein the first (2) and the at least one further metal strip (4) are made from different metals, preferably from different metals having different yield strengths, wherein a sleeve is formed from the first metal strip (2) in several passes by roll profiling with a plurality of roll stands (G1, G2), said sleeve completely surrounding in the final shape the at least one further metal strip (4) in the circumferential direction. The invention is characterized in that first only the first metal strip (2) is shaped into a preform in several passes with a first group (G1) of roll stands and thereafter, in a second group (G2) of roll stands, the first (2) and the at least one further metal strip (4) are shaped together to form the final shape.