The elastic curve of the mill is not exactly a straight line, at the beginning of the elastic curve is not a straight line, but a small section of the curve. This is due to the existence of a certain gap between the components of the mill and the contact is not uniform.
The elastic curve of the mill is not exactly a straight line, at the beginning of the elastic curve is not a straight line, but a small section of the curve. This is due to the existence of a certain gap between the components of the mill and the contact is not uniform. With the increase in rolling pressure, the slope of the elastic curve gradually increases. When the rolling pressure increases to a certain value, the elasticity curve can be approximated as a straight line. In practice, most of the millwork is in the elastic curve of the straight-line range, therefore, the slope of the straight-line part is usually called the mill stiffness factor K, or called the mill modulus.
The physical significance of the mill stiffness coefficient refers to the size of the working mill seat resistance to elastic deformation. That is when the mill produces a unit (1mm) of elastic deformation required when the size of the rolling pressure, the greater the force. The greater the stiffness coefficient (that is, the steeper the elastic curve), indicating that the greater the stiffness of the mill, and the smaller the elastic deformation of the mill. In layman's terms, the mill stiffness coefficient K that the work of the mill seat of the degree of softness.
As a result of full hydraulic press down, so do not consider the elastic deformation of the press down the device. The use of oil film bearing, the thickness of the oil film with the roll speed and oil film temperature changes, the current use of a general simple mathematical formula to calculate the oil film thickness changes and difficulties. The rough stiffness calculation, may not consider the effect of oil film thickness. Therefore, the elastic deformation of the working seat of the four-roller mill includes.
(1) the deformation of the plate δH
(2) the deformation of the roll δ R, including three parts
Work roll deformation δR1
The contact deformation between the work roll and the support roll δR2
Bending and shear deflection of the support roll δR3
(3) The deformation between the bearing seat and the bearing seat and the plate δC
Where DB is the diameter of the support roller, W is the length of the support roller, DW is the diameter of the working roller, W2 is the width of the pagoda column, W3 is the thickness of the pagoda column.
Substitute the data provided by Qinggang into the above formula to get the deformation of the pagoda
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