CN202490919U - Device by using electromagnetic induction water-cooling joint-cutting type crystallizer as ingot mould - Google Patents

Abstract

The utility model discloses a device for an electromagnetic induction water-cooled slit crystallizer as an ingot mould. The device can be used to obtain extra-thick plate raw materials meeting the internal quality and compression ratio requirements of the ingot. The utility model is composed of an electromagnetic induction device, a water-cooled slotted crystallizer, a filling material and an auxiliary mechanism, wherein the electromagnetic induction device includes two or three sets of induction coils, and the water-cooled slotted crystallizer includes a liftable water-cooled chassis and a wall opening. The four-sided condensation wall with holes, the filling material is filled in the holes on the four-sided condensation wall to increase the magnetic permeability and prevent steel leakage. The auxiliary mechanism includes the frame and auxiliary electromagnetic induction device arranged outside the induction coil, and the driving mechanism for the lifting of the water-cooled chassis . The utility model effectively improves the magnetic permeability of the ingot mold, which is beneficial to make full use of the magnetic efficiency and reduce the power consumption of the induction device; it is beneficial to cast a steel ingot with dense internal structure, less segregation and less inclusions; the ingot mold device is easy to operate, safe and not easy damage.

Description

An electromagnetic induction water-cooled slit crystallizer as an ingot mold device

technical field

The utility model belongs to the technical field of metallurgical casting, in particular to an electromagnetic induction water-cooled slit crystallizer as an ingot mould.

Background technique

Extra-thick steel plates are often used in shells of atomic power stations, bases of high-rise buildings, offshore oil platforms, high-pressure vessels, aircraft carrier armor plates, heavy chemical reaction towers, hydropower, thermal power, wind turbine bases, etc., which are high performance, high purity, and high added value. Products, most of which require ultrasonic flaw detection, and some also require Z-direction performance. At present, some countries in Europe, the United States and Japan have invested a lot of time and energy in research on the production of extra-thick plate raw materials, and have made breakthroughs.

At present, conventional ingot molds are mostly cast iron molds. When using them to produce steel ingots, due to the solidification and shrinkage of molten steel, an air gap is generated between the ingot mold and the steel ingot, which seriously affects the heat transfer conditions. Most of the cast steel ingots have congenital inverted V-shaped segregation, Casting defects such as center segregation and center looseness; the water cooling strength at the bottom of the directional solidification technology device is relatively strong, and the head is equipped with a heat preservation cover, which is conducive to the production of columnar crystals, but there is a solute-enriched layer on the top of the ingot cast by it, which is difficult to clean , It also affects its popularization and application; while the ordinary water-cooled crystallizer device has enhanced cooling capacity, but there is still no external heat source, the upper part of the ingot is insufficiently fed, and it is difficult to ensure the internal quality when casting larger ingots.

Utility model content

The purpose of the utility model is to provide an electromagnetic induction water-cooled slit crystallizer as an ingot mould, which can be used to obtain extra-thick plate raw materials that meet the requirements of the internal quality and compression ratio of the ingot.

The utility model provides a device using an electromagnetic induction water-cooled slit crystallizer as an ingot mold, which is composed of an electromagnetic induction device, a water-cooled slit crystallizer, a filling material and an auxiliary mechanism, wherein the water-cooled slit crystallizer is set In the center of the device, the water-cooled slotted crystallizer includes a water-cooled chassis that can be lifted at the bottom and a condensation wall with holes evenly opened on the four sides of the wall. Filling materials are filled in the holes on the condensation wall to increase magnetic permeability and prevent steel leakage. Electromagnetic induction The device is arranged on the periphery of the water-cooled slotted crystallizer. The electromagnetic induction device includes two sets of induction coils, the upper and the lower. The auxiliary mechanism includes a frame arranged outside the induction coil, an electromagnetic induction device drive mechanism, and a water-cooled chassis drive mechanism.

The driving mechanism of the electromagnetic induction device and the driving mechanism of the water-cooled chassis are lead screws or hydraulic cylinders. The driving mechanism of the electromagnetic induction device is arranged next to the water-cooled slit crystallizer, and the driving mechanism of the water-cooled chassis is arranged under the water-cooled chassis, and is connected with the water-cooled chassis. connected.

For the two sets of induction coils, the upper coil is fed with a high-frequency alternating current of 1-100 kHz, and the lower coil is fed with a low-frequency alternating current of 50-1000 Hz. During the solidification process of the steel ingot, the upper and lower induction coils in the electromagnetic induction device are driven by the driving mechanism, and can be controlled to rise and fall according to the needs of the solidification process of the steel ingot.

The water-cooled chassis and the four-sided condensation walls are made of copper alloy with good thermal conductivity, assembled and disassembled by bolts, the water-cooled chassis and the four-side condensation walls have their own water inlets and outlets, respectively connected to the water inlet and outlet pipes.

The water-cooled chassis is automatically lifted and lowered by PLC under the action of the driving mechanism, so that the same set of ingot moulds can produce ingots with different ingot weights. In the early stage of pouring, the water-cooled chassis is gradually lowered from the upper end by the driving mechanism to prevent excessive splashing of molten steel, and finally the demoulding is performed by lowering the water-cooled chassis.

On the four sides of the condensing wall, avoiding the waterway, there are even holes and seams that are inclined at an angle to the vertical direction of the condensing wall, and are filled and sealed with heat-conducting and non-conductive materials. 0° to 360°, the width of the strip-shaped aperture is 0.01mm to 20mm, and the diameter of the circular aperture is equal to the width of the strip-shaped aperture.

Compared with the existing device, the utility model has remarkable beneficial effects embodied in:

1. The crystallizer with holes and slits effectively improves the magnetic permeability of the ingot mold, which is conducive to making full use of the magnetic efficiency, reducing the power consumption of the induction device, and saving production costs.

2. The upper and lower induction coils in the electromagnetic induction device can be controlled up and down according to the needs of the solidification process through the auxiliary mechanism. The upper coil not only has the function of soft contact, which improves the surface quality of the steel ingot, but also has the effect of a certain hot-top mold, which maintains the heat source in a certain area on the upper part of the ingot, so that there is a certain temperature difference between it and the cooling area on the lower part of the ingot, effectively improving the feeding strength of the upper part of the ingot. To ensure the sequential solidification of steel ingots from bottom to top; the lower induction coil has the function of electromagnetic stirring, which is conducive to improving the flow and heat transfer conditions of molten steel in the liquid phase and improving the internal quality of steel ingots.

3. Due to the water-cooled slit-type copper crystallizer of the utility model, the solidification speed of the steel ingot is fast, and the production rhythm is improved. In addition, the water-cooled chassis can be automatically controlled by the PLC to lift and lower under the action of the driving mechanism, so that the same set of ingot molds can produce ingots with different ingot weights. In the early stage of pouring, the driving mechanism controls the water-cooled chassis to gradually descend from the upper end to prevent excessive splashing of molten steel. Finally, the demoulding is performed by lowering the water-cooled chassis. The operation is simple, safe, and not easy to damage.

4. The utility model does not have the difficulty of finally cutting off the solute-enriched area, and has higher efficiency and lower energy consumption than the electroslag remelting device on the basis of ensuring quality.

The utility model will be further described below through the accompanying drawings and specific embodiments, but it does not mean to limit the protection scope of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of the device structure of an electromagnetic induction water-cooled slit crystallizer as an ingot mould;

Fig. 2 is a schematic diagram of the structure of the condensation wall wide surface of the device of the electromagnetic induction water-cooled slit type crystallizer as the ingot mold (the perforated seam on the condensation wall is a vertical strip);

Fig. 3 is the condensate wall wide-face structural representation of the device of the electromagnetic induction water-cooled slit type crystallizer as the ingot mould (the perforated slit on the condensate wall is a horizontal strip shape);

Fig. 4 is a schematic diagram of the structure of the wide surface of the condensation wall of the device of the electromagnetic induction water-cooled slotted crystallizer as the ingot mold (the holes and seams opened on the condensation wall are circular).

In the figure: condensation wall 1, water-cooled chassis 2, electromagnetic induction device 3, induction coil 4, driving mechanism 5, waterway 6, holes and seams 7.

Detailed ways

As shown in Figure 1, an electromagnetic induction water-cooled slit mold is used as an ingot mold device, which is composed of an electromagnetic induction device 3, a water-cooled slit mold, filling materials and auxiliary mechanisms. Among them, the electromagnetic induction device 3 includes two sets of induction coils 4; the water-cooled slit mold includes a bottom water-cooled chassis 2 and a four-sided condensation wall 1 with holes evenly opened on the wall, and the water-cooled chassis 2 and the four-side condensation wall 1 are assembled and disassembled by bolts , the water-cooled chassis 2 and the four-side condensation wall 1 have their own water inlets and water outlets, which are respectively connected to the water inlet pipe and the water outlet pipe; the filling material is a heat-conducting and non-conductive material, which is filled in the holes 7 on the four-side condensation wall; the auxiliary mechanism includes setting The frame outside the induction coil 4 and the auxiliary electromagnetic induction device 3 and the drive mechanism 5 for lifting the water-cooled chassis. The driving mechanism 5 is a leading screw or a hydraulic cylinder. The driving mechanism of the electromagnetic induction device is arranged beside the water-cooled slotted crystallizer, and the driving mechanism of the water-cooled chassis is arranged under the water-cooled chassis and connected with the water-cooled chassis.

The upper coil in the electromagnetic induction device 3 is fed with a high-frequency alternating current of 1-100 kHz, and the lower coil is fed with a low-frequency alternating current of 50-1000 Hz. During the solidification process of the steel ingot, the upper and lower induction coils in the electromagnetic induction device 3 are driven by the driving mechanism, and are controlled to rise and fall according to the needs of the solidification process of the steel ingot.

Under the action of the driving mechanism, the water-cooled chassis is automatically controlled by PLC to lift up and down, so that the same set of ingot molds can produce ingots with different ingot weights. In the early stage of pouring, the water-cooled chassis is gradually lowered from the upper end by the driving mechanism to prevent excessive splashing of molten steel, and finally the demoulding is performed by lowering the water-cooled chassis.

As shown in Figures 2, 3, and 4, on the condensation wall 1, avoiding the waterway 6, there are evenly opened holes 7 that form a certain inclination angle with the vertical direction of the condensation wall, and are filled and sealed with heat-conducting and non-conductive materials. It is strip-shaped or circular, with an inclination angle of 0° to 360°, a strip-shaped slit width of 0.01mm to 20mm, and a circular slit diameter equal to the strip-shaped slit width.

The utility model provides an electromagnetic induction water-cooled slit crystallizer as an ingot mould, and the working process is as follows:

Before working, assemble the water-cooled chassis 2 and the four-sided condensing walls 1 through bolts to form a cavity to form an ingot mold, and pass cooling water. When the working state is stable, the PLC automatically controls the driving mechanism 5 to make the water-cooled chassis rise to the vicinity of the cap mouth. Pour the smelted molten steel into the ingot mold, and control the water-cooled chassis to gradually lower to prevent excessive splashing of the molten steel until the required ingot weight is reached, and arrange the mold powder on the liquid surface. Due to the effect of the condensation wall 1 and the water-cooled chassis 2, the molten steel solidifies from bottom to top and from outside to inside. When the electromagnetic induction device 3 and the driving mechanism 5 are turned on, since the upper and lower coils 4 are passed with alternating currents of different frequencies and powers, the power and frequency tend to decrease from top to bottom, and at the same time, large induction heat and Electromagnetic pressure, the heat becomes the upper heat source in the solidification process of the steel ingot, which promotes the solidification of the steel ingot from bottom to top, which is helpful for the feeding of the upper molten steel, and the electromagnetic pressure is also conducive to forming a soft contact effect and improving the surface quality of the steel ingot; at the same time, electromagnetic induction The electromagnetic stirring force generated by device 3 which decreases from bottom to top can improve the flow and heat transfer conditions of molten steel, not only prevent slag entrainment on the surface of molten steel, but also help disperse segregation and remove gas inclusions. According to the needs of the solidification simulation process of the molten steel in the ingot mold, the induction coil 4 is driven by the driving mechanism 5 and is automatically controlled by the PLC to rise slowly until the steel ingot is fully solidified and the power supply and cooling water are stopped. Finally, under the action of the driving mechanism 5, the water-cooled chassis is gradually lowered for demoulding, and the cast steel ingot is taken out. So far, the device of the present invention can cast a steel ingot with dense internal structure, no porosity, no inverted V-shaped segregation, less inclusions, and meets requirements.

Claims (6)

1. A device using an electromagnetic induction water-cooled slit crystallizer as an ingot mold, characterized in that the device is made up of an electromagnetic induction device, a water-cooled slit crystallizer, filling materials and auxiliary mechanisms, wherein it is a water-cooled slit crystallizer The water-cooled slit crystallizer includes a water-cooled chassis that can be lifted at the bottom and a condensation wall with holes evenly opened on the four sides. The filling material is filled in the holes on the condensate wall, and the electromagnetic induction device is installed in the water-cooled slit. The electromagnetic induction device includes two sets of upper and lower induction coils, and the auxiliary mechanism includes a frame arranged outside the induction coil, an electromagnetic induction device drive mechanism, and a water-cooled chassis drive mechanism. 2. The device according to claim 1 as an ingot mould, characterized in that said electromagnetic induction device drive mechanism and water-cooled chassis drive mechanism are lead screws or hydraulic cylinders, and the electromagnetic induction device The driving mechanism is arranged beside the water-cooled slit crystallizer, and the water-cooled chassis driving mechanism is arranged under the water-cooled chassis and connected with the water-cooled chassis. 3. The device according to claim 1 as the ingot mould, characterized in that said two groups of induction coils, the upper coil is connected with 1～100kHz high-frequency alternating current, and the lower coil The upper and lower sets of induction coils in the electromagnetic induction device can be controlled to rise and fall under the drive of the driving mechanism by passing a low-frequency alternating current of 50-1000 Hz. 4. The device using electromagnetic induction water-cooled slotted crystallizer as ingot mold according to claim 1, characterized in that said water-cooled chassis and four-sided condensation walls are made of copper alloy with good thermal conductivity, assembled and disassembled by bolts , the water-cooled chassis and the four sides of the condensing wall have their own water inlets and outlets, which are connected to the water inlet pipe and the water outlet pipe respectively. 5. The device using electromagnetic induction water-cooled slotted crystallizer as ingot mold according to claim 1, characterized in that said water-cooled chassis is automatically controlled up and down by PLC under the action of a driving mechanism. 6. The device according to claim 1, wherein the electromagnetic induction water-cooled slit crystallizer is used as an ingot mould, wherein said four-sided condensing wall avoids water passages and evenly has a slanting angle with the vertical direction of the condensing wall. The holes are filled and sealed with thermally conductive and non-conductive materials. The shape of the holes is long or circular, and the inclination angle is 0° to 360°. The diameter of the aperture is equal to the width of the strip aperture.

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