One-Piece Rolling Mill Stand with Horizontal Roller Displacement
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Solution Overview
Problem
Existing one-piece rolling mill stands face challenges in accommodating various roll diameters and maintaining sufficient opening for product insertion and maintenance without separating the upper and lower frames, particularly during incidents like strip breakage.
Innovation Solution
Incorporating a secondary displacement mechanism that allows at least one row of support rollers to move horizontally, slaved to the primary vertical or inclined displacement, increasing the internal space between work rolls for larger rolls and enabling easier maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rolling mill stand is constructed as a one-piece type with fixed assembly of upper and lower frames, then the structural strength and rigidity are improved, but the opening space between work rolls is insufficient for inserting larger diameter rolls and for maintenance operations
Solution Approach 1:
The support rollers are divided into multiple rows (first row, second row, third row, fourth row) that can be independently displaced horizontally. This segmentation allows selective opening of specific roller rows to create sufficient space for roll insertion and maintenance while maintaining the one-piece frame structure for strength.
Solution Approach 2:
The support rollers are made dynamically adjustable through horizontal displacement mechanisms (101, 102, 103, 104) that allow the rollers to move between a tight rolling position during operation and an open position during maintenance or roll change. This dynamic capability resolves the contradiction between structural rigidity and operational accessibility.
2Manufacturing precision
If the support rollers are fixed in position to maintain structural rigidity, then the manufacturing precision is improved, but the adaptability to accommodate various roll diameters is reduced
Solution Approach 1:
The support rollers are equipped with horizontal displacement mechanisms that enable them to adjust their positions dynamically. During normal operation, the rollers maintain a precise tight rolling position for manufacturing precision, but can be horizontally displaced to accommodate different roll diameters when needed, providing adaptability without sacrificing structural rigidity.
Solution Approach 2:
The rolling mill stand is designed with universally adjustable support rollers that can accommodate various roll diameters through horizontal displacement. The same stand structure and mechanism serve multiple functions: maintaining precise positioning during operation and enabling adaptability for different product specifications, eliminating the need for multiple dedicated stands.
3Adaptability or versatility
If a secondary horizontal displacement mechanism is added to the support rollers, then the adaptability and ease of operation are improved, but the device complexity increases
Solution Approach 1:
The displacement mechanism is segmented and distributed across individual support roller rows rather than using a single complex centralized system. Each row (first, second, third, fourth row) has its own displacement capability, allowing independent adjustment. This segmentation simplifies the overall system design and control while achieving the adaptability goal.
Solution Approach 2:
The patent introduces intermediate displacement mechanisms (101, 102, 103, 104) that act as mediators between the fixed one-piece frame structure and the support rollers. These intermediaries enable horizontal movement of the rollers without compromising the structural integrity of the main frame, resolving the complexity issue by providing a clear functional interface between the rigid structure and the adjustable components.
Data Source
AI summary
The present invention describes a multi-roller rolling mill stand comprising, in a vertical direction, an upper frame part and a lower frame part joined together in a single piece, each of the frame parts comprising respectively a set of upper and lower rolls, said upper and lower rolls being composed of rows of support rollers intended to create pressure effects on intermediate rolls, themselves creating pressure effects on a pair of work rolls intended to roll two faces of a horizontally moving metal product when, internally within the frames, the sets of upper and lower rolls are brought into a tight rolling position by first means of movement respectively having a predominantly vertical rectilinear component or even inclined with respect to the vertical.The rolling mill stand according to the invention is further characterized in that at least one of the rows of support rollers (such as rows A, D, E, H of Figure 1) is coupled to a second means of movement generating a main component of movement of the row along at least one horizontal axis in the direction of the working rolls, said second means of movement being activated as soon as the set of lower or upper rolls to which said row of support rollers belongs is brought vertically towards the tight rolling position.