Dynamic Scraper Pressure for Rolling Mill Lubricant Removal
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Solution Overview
Problem
Existing roll stand systems face challenges in effectively preventing lubricant coating on the rolled strip surface, leading to increased energy consumption in annealing treatments, noise emissions, and surface discolouration due to unsteady lubricant coverage during roll acceleration and braking.
Innovation Solution
A method and device that dynamically adjust the contact pressure of the scraper edge with the roll surface based on operating parameters like peripheral speed, temperature, and lubricant properties, combined with a cleaning device for the scraper edge, to ensure reliable lubricant removal without excessive wear or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high contact pressure is applied to the scraper device to ensure effective lubricant removal, then lubricant removal effectiveness is improved, but wiper lip wear increases and noise emissions increase
Solution Approach 1:
The scraper device is designed with a flexible mounting that allows the scraper edge to dynamically adapt its contact pressure with the roll surface. Instead of fixed high pressure, the scraper can flex and conform to the roll surface conditions, maintaining effective lubricant removal while reducing excessive wear and noise during operation.
Solution Approach 2:
The contact pressure parameter is changed from a constant high value to a variable value that adapts to operating conditions. The flexible mounting system allows the contact pressure to vary automatically based on roll surface conditions, lubricant film thickness, and operational phase, optimizing the balance between removal effectiveness and wear/noise reduction.
2Reliability
If high contact pressure is applied to the scraper device to ensure reliable lubricant stripping, then lubricant removal reliability is improved, but noise emissions increase during low roller speeds
Solution Approach 1:
The flexible mounting enables the scraper device to dynamically adjust its contact characteristics. During low-speed operation, the flexibility allows the scraper to conform to the roll surface without maintaining excessive contact pressure, thereby reducing noise emissions while preserving adequate lubricant stripping capability when needed.
3Object-generated harmful factors
If the scraper device is not in contact with the roll surface during acceleration and braking, then noise emissions are reduced, but lubricant coating on the rolled strip surface increases
Solution Approach 1:
The flexible mounting system allows the scraper to maintain light contact with the roll surface during acceleration and braking phases without generating excessive noise. The flexibility enables the scraper to follow the roll surface motion dynamically, ensuring continuous lubricant removal coverage even during transient operational phases.
Solution Approach 2:
The contact pressure parameter is dynamically adjusted through the flexible mounting to be sufficient for lubricant removal during acceleration and braking, but not excessive to cause noise. This automatic parameter adaptation ensures reliable lubricant stripping across all operational phases without sacrificing noise control.
4Reliability
If constant high contact pressure is applied to the scraper edge, then lubricant removal effectiveness is maintained across all operating conditions, but energy consumption and wear increase
Solution Approach 1:
The flexible mounting transforms the constant high pressure system into a dynamic system that automatically adjusts contact characteristics. The scraper flexes and adapts to actual operating conditions, maintaining consistent lubricant removal effectiveness while reducing energy consumption and wear by avoiding unnecessarily high contact pressures during normal operation.
Data Source
Figure 1
Figure 2~4
AI summary
The method involves conveying a rolled strip (14) through a rolling gap (13) formed between work rollers (12) in the strip running direction (15), and fitting a scraping unit (20,21) with a scraping edge (25,26) on an inlet side or an outlet side of the rolling mill (10) with contact pressure against a rolling surface (24) of the work roller or a support roller (16,17) supporting the work roller in the rolling mill. The contact pressure is changed corresponding to the operating parameter of the rolling process. An independent claim is also included for a device for removing coolant and lubricant of rollers of a rolling mill.