Adjustable Guide Unit for Hot Rolling Stand Threading
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Solution Overview
Problem
Conventional roll stand designs face challenges in reliably guiding heavily deformed and thick rolling stock into the roll gap, particularly in heavy-plate and roughing stands, due to fixed guide plate angles that either lead to descaling issues or rolling stock collision.
Innovation Solution
A roll stand with a guide unit featuring a guide element close to the roll with a fixed angle and a remotely located guide element connected in an articulated manner, allowing the angle of attack to be varied by a controllable adjustment unit, which is electronically controlled based on material, rolling, and descaling parameters, ensuring reliable threading and reduced downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide plate has a steep, fixed angle of attack, then the threading of rolled material into the roll gap is more reliable, but the descaling unit must be positioned very close to the roll gap requiring complex sealing and exposing components to abrasive descaling water
Solution Approach 1:
The guide plate transitions from a fixed angle design to a dynamically adjustable angle design. The guide plate is equipped with an adjustment mechanism that allows its angle of attack to be varied according to the specific rolling conditions, material type, and process requirements. This dynamic adjustment capability enables the system to optimize threading reliability for each scenario without being constrained by a fixed steep angle, thereby eliminating the need for complex sealing arrangements and close positioning of the descaling unit.
Solution Approach 2:
The angle of attack of the guide plate is changed from a fixed parameter to a variable parameter. By adjusting the angle parameter within a certain range, the system can adapt to different material geometries and deformation conditions. This parameter change allows the guide plate to maintain reliable threading performance across various operating conditions while avoiding the drawbacks associated with always using a steep fixed angle, thus simplifying the descaling unit positioning and sealing requirements.
2Device complexity
If the guide plate has a shallow, fixed angle of attack, then the descaling unit is positioned at a greater distance from the roll gap, but the rolled material can collide with the guide plate without being guided into the roll gap
Solution Approach 1:
The guide plate transitions from a fixed shallow angle design to a dynamically adjustable angle design. The adjustment mechanism allows the guide plate angle to be optimized for each specific rolling condition, ensuring that the angle is steep enough to reliably guide heavily deformed material into the roll gap while still maintaining sufficient distance from the roll gap to simplify descaling unit positioning and sealing requirements.
Solution Approach 2:
The angle of attack parameter is made variable, allowing it to be adjusted within an optimal range. This parameter change enables the system to find the right balance between guiding reliability and descaling unit positioning for each specific material and process condition, rather than being constrained by a fixed shallow angle that compromises threading reliability.
3Device complexity
If the guide plate angle is fixed, then the device structure is simpler, but the system cannot adapt to varying rolling stock geometries and deformation conditions
Solution Approach 1:
The guide plate is designed with adjustable angle capability through an integration mechanism that can pivot or rotate the guide plate relative to the rolling direction. This dynamic adjustment feature allows the system to adapt to various rolling stock geometries and deformation conditions while maintaining a relatively simple overall structure. The adjustment mechanism is designed to be compact and straightforward, avoiding excessive structural complexity while providing the necessary adaptability.
Solution Approach 2:
The guide plate is designed to serve multiple functions: guiding material into the roll gap, adapting to different material geometries, and working in conjunction with the descaling unit at various positions. By making the guide plate angle adjustable, a single guide plate structure can effectively handle diverse rolling conditions and material types, replacing what would otherwise require multiple fixed-angle guide plates for different scenarios.
Data Source
Figure 1
AI summary
The invention relates to a rolling stand (1) for a hot rolling mill, comprising at least one upper work roll (2) adjustable against a rolled material, at least one entry-side or exit-side guide unit (5, 6) for guiding the rolled material entering or exiting the rolling stand (1), and at least one controllable adjusting unit (7, 8) connected to the guide unit (5, 6), wherein the guide unit (5, 6) comprises at least one roll-adjacent guide element (9, 10) with a fixed angle of approach and at least one roll-remote guide element (12, 13) connected to the adjusting unit (7, 8) and pivotally connected to the roll-adjacent guide element (9, 10), and wherein an angle of approach (α1, α2) of the roll-remote guide element (12, 13) is variable by means of the adjusting unit (7, 8).In order to reliably thread and roll even highly deformed rolled material into a roll gap of the rolling stand (1), the rolling stand (1) has at least one control electronics (28) connected to the adjustment unit (7, 8), which is configured to control the adjustment unit (7, 8) taking into account at least one rolled material parameter (P1), at least one rolling parameter (P2) and/or at least one descaling parameter (P3).