Coiler Mandrel Stiffness for High-Strength Steel
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Solution Overview
Problem
Existing coiler mandrels for winding hot strip materials face challenges in handling high-strength and ultra-high-strength steels due to insufficient rigidity and load capacity, as they are not designed to manage the increased strength and corrosion resistance requirements of newer steel grades.
Innovation Solution
The design of the coiler mandrel is enhanced by supporting wear plates on the closed mandrel body rather than the mandrel extension, eliminating axial recesses at the ends of the mandrel body to increase stiffness, and incorporating pivotably mounted lugs and strategically positioned recesses for improved assembly and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mandrel body is open at the front to allow easy assembly of spreader bar and segments, then ease of manufacture is improved, but rigidity and load capacity deteriorate
Solution Approach 1:
The mandrel body is designed with a closed front end before assembly operations, maintaining structural rigidity. The spreader bar and segments are pre-assembled with tabs that engage with recesses in the mandrel body, allowing the closed mandrel design to be maintained while still enabling assembly through the side recesses rather than requiring an open front end.
2Strength
If the mandrel body is closed at the front end to increase rigidity, then strength is improved, but ease of assembly deteriorates
Solution Approach 1:
The mandrel body is segmented into a closed front end portion and a rear end portion with recesses. The spreader bar and segments form a separable assembly that can be inserted into the closed mandrel body through the recesses, allowing the mandrel to maintain its closed rigid structure while still enabling assembly operations.
3Ease of manufacture
If wear plates are supported on the mandrel extension instead of the closed mandrel body, then ease of assembly is improved, but load capacity deteriorates
Solution Approach 1:
The wear plates are integrated with the closed mandrel body structure rather than being separate components on the mandrel extension. This merging of the wear plate support function into the main mandrel body structure allows the wear plates to benefit from the higher load-bearing capacity of the closed end while maintaining proper wear protection functionality.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a coiler mandrel (1) for coiling sheet metal, especially hot-rolled strips. Said mandrel comprises a mandrel base (2), an expansion bar (3) that can be adjusted relative to the mandrel base (2) in an axial direction (a) and a plurality of segments (4) which can be radially adjusted when the expansion bar (3) is axially displaced relative to the mandrel base (2). A plurality of brackets (5) are arranged between the expansion bar (3) and the segments (4) and are hinged to the expansion bar (3) and to the segments (4). The aim of the invention is to allow high-strength and ultra-strength materials to be coiled on such a coiler mandrel. For this purpose, at least one plurality of brackets (5) extend, when the coiler mandrel (1) is mounted, through recesses (6) in the mandrel base (2), said recesses being introduced into the mandrel base (2) in such a manner that the latter, at least on one of its axial ends (7) is free from recesses (6).