Cast Strand Shear Cutting With Wedge Upsetting for Rolling Grip
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Solution Overview
Problem
Existing methods for cutting and rolling thin slabs in cast rolling mills often fail to maintain the necessary grasping condition, leading to production interruptions and require complex, expensive equipment, as they struggle with reduced thickness and friction issues during the rolling process.
Innovation Solution
The method involves using shears to cut the cast strand or intermediate strip with an upsetting tool that creates a wedge-shaped contour, increasing friction for improved rolling by reducing the thickness and incorporating a wedge shape on the slab's front face, allowing for easier grasping during the rolling process, and includes adjustable tools and a controller for adaptive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If greater working roller diameters are provided to prevent grasping condition problems, then rolling reliability is improved, but device complexity and cost increase due to stronger drivetrain requirements
Solution Approach 1:
The method creates a preliminary feed by reducing the thickness of the slab portion that will enter the rolling mill through upsetting before rolling. This preliminary action ensures that the grasping condition is fulfilled during rolling without requiring larger roller diameters or stronger drivetrains, thereby resolving the contradiction between reliability and device complexity
2Reliability
If additional measures are taken to fulfill the grasping condition, then rolling reliability is improved, but production continuity deteriorates due to manual intervention requirements
Solution Approach 1:
The system performs self-service by automatically creating the necessary feed through upsetting before rolling. The controller automatically adjusts the upsetting tool to reduce slab thickness when the grasping condition is not fulfilled, eliminating the need for manual operator intervention and maintaining continuous production, thus resolving the contradiction between reliability and productivity
3Reliability
If a different pass schedule is used with less reduction in the first pass, then grasping condition is improved, but manufacturing precision deteriorates as the originally planned hot-strip thickness may not be achieved
Solution Approach 1:
The method segments the thickness reduction process into two distinct stages: first, upsetting the slab to create a preliminary feed that ensures grasping condition fulfillment; second, performing the planned rolling passes to achieve the target hot-strip thickness. This segmentation allows both the grasping condition and manufacturing precision to be satisfied, resolving the contradiction between reliability and manufacturing precision
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 approach enhances the rolling process by ensuring the grasping condition is met, reducing equipment complexity and cost, and allowing for lighter, more efficient hot-rolling mills with higher output and operational safety.
Implementation Method 1
upset forging a wedge-shaped contour on the start of the cast strand or intermediate strip by pressing an upsetting tool onto both surfaces of the cast strand or intermediate strip such that the thickness of the start of the cast strand or intermediate strip is reduced
Implementation Method 2
a feed can be created with drives, which, in the end, increase the friction after a certain time and thus enable the grasping by the rollers
Data Source
AI summary
A method for cutting a cast strand or intermediate strip using shears. In order to facilitate improved rolling of the section having significantly reduced thickness, the method according has the following steps: a) bringing part of the completely solidified cast strand or intermediate strip in the conveying direction (F) of the cast strand or intermediate strip in front of the shears; b) placing a first blade of the shears onto the one surface of the cast strand or intermediate strip and placing a second blade of the shears onto the other surface of the cast strand or intermediate strip and performing a cut by carrying out a relative movement of the two blades, wherein at least one of the blades is in a pushed-forward position; c) upset forging or upset forging with stamping a wedge-shaped contour on the end of the cast strand.