What is crystallizer of the continuous casting machine

The crystallizer is a very important part of the continuous casting machine(CCM), and it is a forced water-cooled bottomless steel ingot mold. We can call it the “heart” of continuous casting machine.

A trough-shaped container with a jacket on the wall or a serpentine tube in the container for heating or cooling the solution in the trough. The crystallization tank can be used as an evaporative crystallizer or a cooling crystallizer. In order to increase the intensity of crystal production, a stirrer can be added to the tank. The crystallization tank can be used for continuous operation or batch operation. The crystals obtained by intermittent operation are relatively large, but the crystals are easy to connect into crystal clusters, which entrain the mother liquor, which affects the purity of the product.

This kind of crystallizer has simple structure and low production intensity, and is suitable for the production of small batch products (such as chemical reagents and biochemical reagents, etc.).

At this time, the inner wall of the mold bears the combined effect of mechanical stress and thermal stress generated by the static pressure of the high-temperature molten steel and the friction force relative to the billet shell, and its working conditions are extremely harsh.

In order to obtain qualified cast steel billets, the basic conditions that the mold should meet are:

1. It has good thermal conductivity, so that the molten steel can be quickly condensed and formed.
2. It has good wear resistance to extend the life of the crystallizer, reduce the maintenance workload and the time of replacing the crystallizer, and improve the operating rate of the continuous casting machine.
3. It has sufficient rigidity, especially in the case of chilling and heating, and a large temperature gradient. Small deformation is required.
4. The structure is simple, compact, easy to manufacture, easy to disassemble and assemble, and easy to adjust. The cooling water circuit can be connected by itself for quick replacement; the self-weight is small to reduce the inertial force of the mold vibration and reduce the driving power of the vibration device, and make The crystallizer vibrates smoothly.

1. Gradually solidify the molten steel into a blank shell of the required specification and shape;
2. Through the vibration of the mold, the billet shell can be separated from the mold wall without being broken or broken;
3. By adjusting the parameters of the mold, the casting billet does not produce defects such as squaring, bulging and cracks;
4. Ensure the uniform and stable generation of the blank shell.

According to the shape of its inner wall, the type of mold can be divided into straight shape and arc shape.

The inner wall of the straight mold is vertical along the moving direction of the blank shell, so the thermal conductivity is good, and the blank shell is cooled uniformly.

This type of mold is also beneficial to improve the quality of the billet shell and the drawing speed, simple structure, easy to manufacture, easy to install and debug; the inclusions are evenly distributed; but the cast billet is prone to bending cracks, and the height and investment of the continuous caster increase . Straight molds are used for vertical and vertical bending and straight-arc continuous casting machines.

The inner wall of the arc mold is arc-shaped along the moving direction of the blank shell, so the cast slab is not easy to produce bending cracks; but the thermal conductivity is worse than that of the straight mold; The arc crystallizer is used on full arc and elliptical continuous casting machines.

According to the method of obtaining the supersaturated state of the solution, it can be divided into an evaporation crystallizer and a cooling crystallizer; according to the flow mode, it can be divided into a mother liquor circulation crystallizer and a crystal slurry (ie a mixture of mother liquor and crystals) circulation crystallizer; according to the operation mode, it can be divided into a continuous crystallizer And batch crystallizer.

Popularly speaking, the continuous casting mold is a cold forming equipment for molten steel. Basically by the frame, water tank and copper plate (back plate and copper plate), adjustment system (adjustment device, reducer, etc.); lubrication system (oil pipe oil circuit), cooling system and spray equipment.