METHOD OF MONITORING WEAR OF SPINDLE JOINT OF ROLLING MILL STAND Russian patent published in 2025 - IPC B21B37/00 B21B28/00 B21B35/00 B21B38/00 

FIELD: measuring.

SUBSTANCE: invention relates to a method of monitoring wear of a spindle connection of a rolling mill stand. After each transfer of working rolls, the test mode is included in the roll calibration program. Motor torque M₁ is compared with a given motor torque dead zone -ΔM₁ ≤ M₁ ≤ +ΔM₁. When said condition is met, opening of the angular gap is recorded, the motor speed value n_1op and the value of time t_op is stored. After the angular gap is opened in time intervals Δτ, stored are discrete values of the motor speed n₁(Δτ), n₁(2Δτ), n₁(3Δτ), … n₁(kΔτ), n₁((k+1)Δτ). Through time delay t_del=10∙Δτ after the opening of the angular gap, calculate the dynamic change in motor speed Δn₁(kΔτ,(k+1)Δτ)=n₁(kΔτ)-n₁((k+1)Δτ) and comparing it with specified dead zone of dynamic change of motor speed -Δn*₁≤Δn₁(kΔτ,(k+1)Δτ)≤+Δn*₁. When said condition is met, closing of angular gap is fixed. Motor speed value n_1cl and value of time t_cl are stored. Calculated is motor speed difference modulus Δn₁=|n_1op - n_1cl|. Calculated is time interval Δt=t_cl - t_op, during which the angular gap is open. Value of angular clearance in connection of spindle and working roll of stand is calculated by relationship α=(Δn₁/2)∙Δt∙z, where (Δn₁/2) is average dynamic change of engine speed in the interval while the angular gap is open, z=6 is the conversion factor (rpm) to (degree/s).

EFFECT: control of angular gap in connection of spindle and working roll of heavy-sheet mill stand and registration of dynamics of fatigue damages.

1 cl, 10 dwg, 1 tbl