Intermediate frequency induction heating type hot double-roll reversing roller and rolling method

Abstract

The invention relates to a medium-frequency induction heating type thermal double-roll reversible mill and a rolling method. A common double-roll reversible mill is used for hot rolling of magnesium and magnesium alloy, zinc and zinc alloy. In a hot rolling process of the magnesium alloy and the zinc alloy, generally, a blank needs to be heated to be between 400 and 450 DEG C, and simultaneously a roller needs to be preheated to be between 100 and 200 DEG C. A preheating mode for the roller generally adopts flame or a resistance heating mode. The medium-frequency induction heating type thermal double-roll reversible mill comprises a semi-open type induction heater reversible mill body, induction load coils of the mill body are arranged along the axial direction of the roller, a bearing of the mill body is provided with a cooling water channel for cooling cyclic water, a roller heating system of the mill body adopts a crystal gate type medium-frequency induction heating device, and the surface temperature of the roller is detected through a far infrared sensor. The mill and the rolling method are applied in the technical field of rolling.

Description

Technical field: [0001] The invention relates to a rolling method using a medium-frequency induction heating type hot double-roll reversing rolling mill and equipment used in the method. Background technique: [0002] Generally, two-roll reversing mills are used for hot rolling of magnesium and magnesium alloys and zinc and zinc alloys. The roll preheating temperature is much lower than the billet heating temperature, and the roll preheating is only carried out before rolling. Once the rolling starts, the roll does not need to be heated for preheating. During the rolling process, the temperature of the rolled billet is far Higher than the preheating temperature of the roll, at this time, the billet conducts heat to the roll, that is to say, the billet transfers heat to the roll. This is the case for all rolling processes, and this state is called "rolling process with positive temperature field" here. [0003] Since the crystal structure of magnesium alloy and zinc alloy i...

AI Technical Summary

Problems solved by technology

[0003] Since the crystal structure of magnesium alloy and zinc alloy is close-packed hexagonal, the plasticity is poor, and they are hard-to-deform materials. Plastic processing is very difficult, especially the rolling plate is more difficult, and the slab is heated many times. The amount of deformation is about 100%, and the increase in the amount of rolling down in each pass is very easy to produce cracks, resulting in low yield, low production efficiency and high cost, making magnesium and magnesium alloy plates, zinc and zinc alloy plates expensive, and generally difficult to achieve mass production , limiting the popular application of these two materials

Although a lot of research has been done at home and abroad in an attempt to solve the technical problems of hot rolling of magnesium alloys and zinc alloys, there has been no essential breakthrough so far.

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