Hot Strip Mill Shear Cooling With Radiant Heat Shielding
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Solution Overview
Problem
Existing cooling methods for knife-carrying elements in cross-cutting shears, such as drum shears, are inefficient as they either lead to heat transfer to the rolled strip or are complex and costly to implement, failing to adequately reduce thermal stress on the knife-carrying elements.
Innovation Solution
A device with a protective device and guide mechanism that positions shielding elements between the knife-carrying element and the rolled strip to shield the knife-carrying element from heat radiation, using a guide system to move the protective device between cooling and cutting positions without interfering with the knife's movement, and incorporating trough areas for cooling water that flows past the rolled strip, reducing direct heat exposure and heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling water is sprayed onto the knife-carrying element, then the cooling effect is improved, but the rolled strip is also cooled which leads to heat loss
Solution Approach 1:
The cooling system is segmented into separate zones: one for cooling the knife-carrying element and another for cooling the rolled strip. By using separate coolant streams and targeted application points, the system can cool the knife surface without necessarily cooling the strip, or can control the extent of strip cooling independently.
Solution Approach 2:
The cooling water application is localized to specific areas where it is most needed - primarily on the knife-carrying element surface that contacts the hot strip. The cooling intensity and application points are optimized to protect the knife surface while minimizing interference with the strip's thermal requirements.
2Temperature
If the knife drums are rotated out of the rolling line for cooling, then the cooling access is improved, but this results in unintentional cutting of the rolled strip
Solution Approach 1:
The cooling system is designed to be dynamic and adaptive. The knife drums can rotate to optimal cooling positions when the line is idle, and the system automatically adjusts the cooling application timing and intensity based on the operational state, preventing unintentional cutting during active operation.
Solution Approach 2:
The system incorporates automatic detection and control mechanisms that monitor the operational state and autonomously adjust cooling application. When the drum shear is actively cutting, the system detects this and prevents cooling water application that would cause unintentional cutting, allowing the system to self-regulate based on real-time conditions.
3Temperature
If internal cooling holes are inserted into the knife drums, then the cooling coverage is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of making the knife drums themselves complex with internal cooling channels, the invention inverts the approach by using external cooling structures and methods. The cooling is applied from the outside through optimized spray systems and heat dissipation structures on the drum surface, avoiding the need for complex internal drilling and channel formation.
Solution Approach 2:
The system uses simpler, more cost-effective cooling structures that can be easily manufactured and replaced if needed, rather than investing in complex, expensive knife drums with internal cooling channels. The external cooling components are designed to be economical and straightforward to implement.
4Temperature
If internal cooling of the knife drum is implemented, then the cooling capacity is improved, but the stress level reduction is insufficient
Solution Approach 1:
The cooling system employs asymmetric cooling strategies that target the specific stress-prone areas of the knife-carrying element. By applying cooling preferentially to regions experiencing the highest thermal gradients and stress concentrations, the system more effectively reduces thermal stress than uniform internal cooling would achieve.
Solution Approach 2:
The cooling system applies cooling water in advance to prevent excessive temperature rise and stress development, rather than attempting to cool down already-heated components. The preliminary cooling action maintains lower thermal gradients and reduces peak stress levels in the knife-carrying element.
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 solution effectively reduces thermal stress on knife-carrying elements by shielding them from direct heat radiation and minimizing heat loss, achieving efficient cooling without the need for cooling water to reach the rolled strip, thus maintaining lower temperatures and reducing internal stresses.
Implementation Method 1
The rolled strip passes through the shear and heats the areas of the shear adjacent to the rolled strip. In particular, the lower side of the upper blade-bearing element is exposed to intense heat from the rolled strip.
Implementation Method 2
cooling water is sprayed downwards onto the upper knife drum
Implementation Method 3
cooling water then also reaches a surface of the rolled strip
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a device (100) and to a method for cooling a knife-bearing element (102.1, 102.2) of a cross-cutting shear (103), which is in particular installed in a hot rolling mill. When the knife-bearing element (102.1, 102.2) is at standstill, at least one guard device (105) is positioned in a cooling position (K) between the knife-bearing element (102.1, 102.2) and a roll strip (101) running continually through the roller mill, such that a side of the knife-bearing element (102.1, 102.2) opposite the roll strip is shielded by the guard device (105).