What is the working principle of Two High Rolling Machine

       The core working component of Two High Rolling Machine is a pair of parallel rollers arranged vertically. By relying on the gap between the two rollers, rolling pressure is applied to metal sheets, strips, and billets, causing plastic deformation of the materials, reducing thickness and elongation, and achieving thinning and shaping. Divided into reversible and irreversible; Cold rolling and hot rolling double roll mills have a simple structure and are commonly used for rough rolling of thin strips, foils, non-ferrous metals, and steel billets.

Complete explanation of working principle

1.Roller gap setting

      Adjust the gap between the upper and lower rollers through a pressing mechanism (hydraulic/screw pressing) to set the target rolling thickness; The rolling mill is driven by the main motor and reducer, and rotates at a constant speed in opposite directions: the upper rolling mill rotates downward, and the lower rolling mill rotates upward.

2.Bite into the billet

      The billet is fed into the entrance side between two rolling mills. Friction is generated between the rotating roller surface and the billet, which pulls the workpiece into the roller gap. This process is called biting.

3.Plastic deformation (rolling core)

      The billet enters the gap between the rollers and is subjected to the squeezing effect of two rollers, causing plastic deformation inside the metal:

      Thickness reduction (compression)

      The length direction is extended and lengthened

      Slight widening of the width

      The volume of metal remains basically unchanged, and materials with reduced thickness are transformed into length extensions.

      Inside the gap between the rollers, there is relative sliding between the material and the rollers, and the velocity of the billet on the inlet side is lower than the linear velocity of the rollers; On the exit side, the rolling speed is higher than the surface speed of the rolling mill, and there is a neutral surface.

4.Rolling output

      After being squeezed by the roll gap, the rolled piece is sent out from the exit side of the rolling mill to obtain the sheet/strip with reduced thickness.

      Irreversible double roll rolling mill: The material passes through in one direction to complete the rolling process;

      Reversible double roll rolling mill: The rolling mill can be reversed, and the rolled piece repeatedly passes through the rolls back and forth, gradually thinning, suitable for large reduction processing.

5.Collaborative auxiliary system

      Roller cooling: The rolling process generates a large amount of deformation heat, and a cooling medium is sprayed to control the temperature of the rollers;

      Tension mechanism: Install front and rear coilers during strip rolling to establish tension and ensure flatness of the plate shape;

      Pressing system: Real time adjustment of roller gap to control the accuracy of finished product thickness;

      Lubrication system: Rolling oil lubrication reduces roll wear and improves surface quality.

Main Features

      Simple structure, few roller systems, and relatively low equipment investment;

      Suitable for hot rolling and cold rolling; Can roll copper, aluminum, stainless steel, carbon steel, etc;