Profile Ring Rolling

The driving force that rotates the ring in the ring mill is generated by the main roll and the axial roll. Of these two rotational speeds, the rotational speed of the main roll is used as a reference, and the axial roll is controlled according to the rotational speed of the main roll.  Normally, the rotation speed of the main roll is fixed and the rotation speed of the axial roll is controlled according to the position of the ring. In the previous, we have understood the concept of linear velocity( What is linear velocity ) and studied how to obtain the linear velocity of the main roll( The linear velocity of main roll ) and the linear velocity of the axial roll( The linear velocity of axial roll ). The linear velocity of the main roll(V m ) is fixed and constant and we control the rpm of axial roll to match the linear velocity of the axial roll(V a ) with that of the main roll. The linear velocity of the main roll(V m ) is, V m = R m x ω m The linear velocity of the a...

I posted on this blog about the linear velocity of the main roll.( The linear velocity of the main roll in ring rolling ) The formula for calculating the linear velocity of an axial roll is a bit more complicated than that of the main roll because the axial roll is a cone shape. As you know, the linear velocity is the product of the rotation radius and the rotation speed. V = R x ω (V : linear velocity, R : rotation radius, ω : rotation speed) 1. The rotation radius of the axial roll The rotation radius of the main roll(R m ) is constant, but the rotation radius of the axial roll(R a ) varies with the position of the ring. The rotation radius of the axial roll(R a ) is, R a   = TR x sin(θ/2) (TR : the encoder value of the Tracer Roll, θ : the cone angle of the axial roll) I explained in the previous post about the TR encoder( The encoders of the ring mill ). 2. The linear velocity of the axial roll The linear velocity of the axial roll is, V a = R...

The three main rolls in the ring mill are the main roll, the mandrel and the axial roll. This means that these three rolls wear quickly and that these rolls should be replaced frequently. And among these three rolls, axial roll is the most expensive roll. Because the axial roll is cone shape, it is difficult to machine.   Why is the axial roll not a cylindrical shape that is easy to machine, but a cone shape that is difficult to machine? I have to explain the linear velocity of the axial roll to tell the reason. I explained the linear velocity of the main roll before  YouTube(What is the linear velocity) In the ring mill, the main roll and axial roll rotate the ring.  The linear velocities of the ring by the main roll(V1) and by the axial roll(V2) should be same.  This ensures that the ring remains in the center of the ring mill. When the linear velocity(V2) of the axial roll is faster or slower than the linear velocity(V1) of the main roll, the center of the ...