Measuring thermal expansion and the thermal crown of rolls
AssigneeNovelis Inc.
InventorAntoine Jean Willy Pralong
Life of this patent
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Abstract
Systems and methods for measuring the thermal crown of rolls in-situ (e.g., at high temperature) either inside or outside the rolling mill can include sensors that measure propagation times of mechanical waves through the rolls. In some embodiments, one or more sensors are used to measure the propagation times of ultrasonic waves traveling inside the roll and normal to the roll's axis. These measurements can be taken when the roll is still hot and can be used to determine in real-time the thermal expansion at various points along the roll.
Claims12
A method for measuring thermal expansion of a roll having a diameter and a surface comprising:
- determining a reference propagation time of a reference mechanical wave propagating along at least one of the diameter or a chord of the roll and through the roll at a reference temperature of the roll, wherein the reference mechanical wave is transmitted through a coupling positioned between a sensor and the roll in a direction that lies within a plane that is normal to an axis of rotation of the roll and wherein the reference propagation time of the reference mechanical wave depends on the reference temperature of the roll;
- transmitting an in situ mechanical wave at a first location on the surface and across at least one of the diameter or the chord and through the roll at an in situ temperature of the roll, the roll rotating about an axis of rotation, wherein the in situ mechanical wave is transmitted through the coupling in a direction that lies within a plane that is normal the axis of rotation during rotation of the roll;
- measuring an in situ propagation time of the in situ mechanical wave through the roll at a second location, wherein the in situ propagation time of the in situ mechanical wave depends on the in situ temperature of the roll;
- and
- determining an amount of thermal expansion of the roll, through which the reference mechanical wave and the in situ mechanical wave pass, between the reference temperature and the in situ temperature by comparing the in situ propagation time with the reference propagation time.
Dependencies are inferred from the claim text.