Modular Rolling Mill Units for Variable Product Sizes
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Solution Overview
Problem
Conventional rolling mill finishing sections can only produce a narrow range of finished product sizes from a single feed product size, requiring multiple feed product sizes and significant downtime for changes between sizes.
Innovation Solution
A modular rolling mill with shiftable rolling units, each comprising two roll stands for oval and round passes, allowing for varied area reductions by replacing specific rolling units with units having different area reduction capabilities, while keeping upstream units unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rolling mill finishing sections use fixed roll stands with alternating oval and round passes, then the mill can produce finished products, but only a narrow range of finished product sizes can be produced from one entry size
Solution Approach 1:
The finishing section is divided into multiple independent rolling units, each capable of being individually configured. This segmentation allows different rolling units to be set up for different product sizes without reconfiguring the entire mill, thereby expanding the range of finished product sizes that can be produced from a single entry size while managing complexity through modular design
Solution Approach 2:
The rolling mill configuration is made dynamic through the ability to quickly change roll passes and rolling sequences between production runs. This dynamic reconfigurability allows the same equipment to adapt to different product size requirements, improving versatility without permanently increasing device complexity
2Adaptability or versatility
If multiple feed product sizes are used to produce different finished product sizes, then the range of finished products can be expanded, but the number of differently sized feed products required increases
Solution Approach 1:
The rolling mill finishing section is designed with universal rolling units that can be configured to produce multiple different finished product sizes from a single feed product size. This multi-functionality eliminates the need to produce and handle multiple different feed product sizes, as the same feed product can be processed through different rolling sequences to achieve various finished dimensions
3Adaptability or versatility
If roll changes and guide changes are made when shifting from one entry size to another, then the mill can produce different finished product sizes, but production downtime increases
Solution Approach 1:
Rolling unit configurations and rolling sequences are pre-planned and prepared in advance for different finished product sizes. This preliminary preparation allows for faster changeovers between product sizes, as the reconfiguration steps are already determined and can be executed more efficiently, thereby reducing production downtime while maintaining flexibility
Data Source
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AI summary
A feed product is rolled into different sized finished products in a rolling mill finishing section which comprises a plurality of modular rolling units (RU1, RU2, RU3, RU5) arranged along the mill pass line. Each rolling unit includes two roll stands (S1-S10) with work rolls configured to define successive oval and round roll passes. The roll stands are designed to effect specific area reductions on products rolled through their respective oval and round roll passes. Feed products (FP1) having the same entry size are rolled into finished products (FP2) having different reduced sizes by providing altered rolling sequences in which a selected rolling unit (RU5) is replaced along the pass line with rolling units (RU5a, RU5b) having roll stands designed to effect area reductions that differ from those of the roll stands of the replaced rolling unit. Rolling units downstream from the replaced rolling unit are removed from the pass line. The roll stands of rolling units upstream from the replaced rolling unit remain unchanged.