Method for predicting fatigue life of hot-rolled strip rolling mill
A fatigue life prediction, hot-rolled plate technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as spalling, metal fatigue damage, roll failure, etc., to achieve strong guidance, high safety, The effect of flexible and easy operation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0035] The 3164# rough rolling work roll, made of high chromium steel, was off the machine normally on October 7, and the roll fatigue (micro cracks) was found after grinding. The roll body diameter after grinding was: ¢1147.11mm Range: 1250 ~ 1125mm).
[0036] It was retrieved that the number of alternating load repetitions Ni of the roll in current service was 260km, which exceeded the normal standard by 28.7%. Substitute its Ni into formula 3 to get △dBw 预 ≈0.92. The actual value △dBw is measured by means of ultrasonic testing 实 =2.7.
[0037] In order to ensure the safe use of the roll on the machine and the smooth production of the rolling mill, it is necessary to properly dispose of the roll, and the methods are but not limited to the following two: First, the fatigue (micro-crack) ultrasonic characteristic signal Only when it drops below 0.92 can it continue to be tracked and used; the second is to coordinate with the production unit to shorten the number of alterna...
Embodiment 2
[0040] 2603# finishing back-up roll, made of Cr5 cast steel, was taken off the machine normally on February 13, and the phenomenon of roll fatigue (micro cracks) was found for the first time after grinding. The diameter of the roll body after grinding was: ¢1522.613mm Use range: 1600 ~ 1440 mm).
[0041] It was retrieved that the number of alternating load repetitions Ni of the roll in current service was 6200km, which exceeded the normal standard by 24.3%. In the predicted curve ( figure 2 ) to find its corresponding ultrasonic characteristic signal △dBw 预 ≈4.2; the actual value △dBw is measured by means of ultrasonic testing 实 =3.9;
[0042] After analysis, because △dBw 实 Less than △dBw 预 , so the roll can continue to be put into turnover, tracking use.
Embodiment 3
[0044] 2603#, finish rolling backup roll, made of Cr5 cast steel, was off the machine normally on March 29, and was in service state of roll fatigue (micro crack) for the second time in a row. The diameter of the roll body after grinding was: ¢1518.317 mm (roll Body diameter use range: 1600 ~ 1440 mm).
[0045]It was retrieved that the number of alternating load repetitions Ni=6500km of the roll in current service exceeded the normal standard by 36.7%. In the predicted curve ( figure 2 ) to find its corresponding ultrasonic characteristic signal △dBw 预 ≈4.4; the actual value of its characteristic signal △dBw measured by ultrasonic 实 =7.6.
[0046] After coordinating with the production unit, 2603# chooses the method of option 2 in "Example 1", that is, the normal service time of the roller is shortened by 50%, and the tracking is used.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More