A pretreatment tank for semi-continuous casting electromagnetic energy grain refinement

Abstract

The present invention discloses a pretreatment trough for semi-continuous casting electromagnetic energy grain refinement, comprising a trough body and a heat-insulating cover arranged on the trough body, two connecting ports are arranged on two opposite trough walls of the trough body, at least one pair of U-shaped silicon steel cores are fixedly arranged on the heat-insulating cover and the trough body, four end posts of each pair of U-shaped silicon steel cores are in the same straight line, a magnetic induction coil is wound around each end post of the U-shaped silicon steel core, and both ends of the magnetic induction coil are connected to a power supply. The present invention is provided with a trough body, a heat-insulating cover and a U-shaped silicon steel core on the trough body and the heat-insulating cover, and a magnetic induction coil is wound around the U-shaped silicon steel core, and a pulse magnetic field is generated after a pulse current is passed through the magnetic induction coil, and the pulse magnetic field instantly generates a large magnetic flux, thereby obtaining pulse electromagnetic energy, which is used to treat the melt and refine the grains of the casting. When in use, the trough body is placed between the flow trough and the casting plate, which can slow down the flow rate and increase the processing time, thereby improving the nucleation rate.

Description

Technical field:

[0001] The invention relates to a pretreatment tank, in particular to a pretreatment tank for semi-continuous casting electromagnetic energy grain refinement. Background technology:

[0002] In the processing and application of aluminum and aluminum alloys, in order to achieve satisfactory results, strict requirements are placed on their organization and performance. Having a uniform and fine grain structure can significantly improve the strength and elongation of the material, while reducing the thermal cracking tendency of the material.

[0003] At present, the commonly used methods for solidification microstructure refinement in industry are mainly chemical method and thermal control method. The chemical method is a method of adding grain refiners or grain growth inhibitors to liquid metal to achieve grain refinement. The function of grain refiners is to strengthen the heterogeneous nucleation process. It can be directly used as a nucleation agent for added nuclei, which are some high-melting-point phases or similar metal particles that have an interface coherent correspondence with the phase to be refined. They can be used as an effective substrate for the phase to be refined in liquid metal to promote heterogeneous nucleation. Adding grain growth inhibitors can reduce the growth rate of grains, increase the number of nuclei relatively, and obtain fine equiaxed crystal structures. The surface active elements it introduces have different adsorption amounts on the crystal faces, which not only changes the relative growth rate of each crystal face during crystal growth, but also promotes dendrite liberation and value-added, thereby changing the number and morphology of grains.

[0004] The thermal control method is to use lower melt processing temperature and pouring temperature during the solidification process, and control the mold temperature and reduce the temperature gradient between the melt and the shell to refine the solidification structure. The thermal control method mainly includes increasing the cooling rate and low superheat casting.

[0005] Electromagnetic energy treatment technology to improve cast structure is a breakthrough technology in improving the structure and performance of metal materials. Starting from the origin of material phase change, this technology affects the phase change dynamics and improves the structure by affecting the energy change during the phase change process. Metal solidification behavior belongs to the material phase change process, and the crystallization behavior during the phase change process is accompanied by energy changes, that is, phase change requires energy to proceed smoothly. In the classical phase change theory, structural fluctuations, composition fluctuations and energy fluctuations are necessary conditions for phase change, among which changing or increasing energy fluctuations is conducive to the phase change. Electromagnetic acts in the form of energy during the material phase change process, which is bound to affect the energy fluctuations and thus affect the phase change process. However, most of the existing electromagnetic energy treatment devices remain in the experimental stage, and the effect of application in the industrial aluminum alloy forming process is not significant. Therefore, it is urgent to develop an industrial electromagnetic energy treatment device that can refine the metal solidification structure and improve product quality. Summary of the invention:

[0006] The object of the present invention is to provide an electromagnetic energy grain refinement pretreatment tank for semi-continuous casting.

[0007] The present invention is implemented by the following technical scheme: a semi-continuous casting electromagnetic energy grain refinement pretreatment tank, which includes a tank body and a heat-insulating cover arranged on the tank body, two connecting ports are arranged on two opposite tank walls of the tank body, at least one pair of U-shaped silicon steel cores are fixed on the heat-insulating cover and the tank body, each pair of the U-shaped silicon steel cores are respectively fixed on the heat-insulating cover and the tank body, the four end columns of each pair of the U-shaped silicon steel cores are all in the same straight line, a magnetic induction coil is wound on each end column of the U-shaped silicon steel core, and both ends of the magnetic induction coil are connected to a power supply.

[0008] Furthermore, the U-shaped silicon steel core disposed on the upper portion of the thermal insulation cover has two end columns penetrating the thermal insulation cover and being disposed in the tank body.

[0009] Furthermore, the magnetic induction coil is a hollow copper tube, and the hollow copper tube is connected to a cooling air source.

[0010] Furthermore, a baffle is vertically provided inside the tank body.

[0011] Furthermore, a plurality of baffles are vertically arranged inside the trough body, and the plurality of baffles are staggeredly arranged inside the trough body, and the planes where the baffles are located intersect with the connecting line between the two connecting ports.

[0012] Furthermore, a resistance wire and a thermocouple are provided inside the groove wall of the groove body.

[0013] Furthermore, a hook is provided on the upper part of the heat-insulating cover.

[0014] Furthermore, a groove is provided at the lower edge of the heat-insulating cover to be engaged with the trough body.

[0015] Furthermore, the U-shaped silicon steel core is formed by laminating multiple layers of high magnetic induction oriented silicon steel sheets.

[0016] Furthermore, the trough body is a rectangular structure, the two communicating ports are respectively opened in the middle of two opposite trough walls, four baffles are provided in the middle position inside the trough body and near the two communicating ports, and the plate surface of the baffle is perpendicular to the line between the two communicating ports.

[0017] Furthermore, the dimensions of the trough body are 300-1000 mm in length, 200-900 mm in width, and 100-500 mm in height.

[0018] Advantages of the present invention:

[0019] 1. The present invention provides a trough body, a heat preservation cover, and a U-shaped silicon steel core on the trough body and the heat preservation cover. The U-shaped silicon steel core is wound with a magnetic induction coil. After a pulse current is passed through the magnetic induction coil, a pulse magnetic field is generated. The pulse magnetic field instantly generates a large magnetic flux, and the pulse electromagnetic energy obtained is used to treat the melt and refine the grains of the casting. When in use, the trough body is placed between the flow trough and the casting plate, which can slow down the flow rate and increase the processing time, thereby improving the nucleation rate.

[0020] 2. This solution takes into account that the magnetic field decays exponentially in space, so U-shaped silicon steel cores and magnetic induction coils are set on the insulation cover and the bottom of the tank, which greatly improves the work efficiency and processes a large amount of melt in a short time.

[0021] 3. The present invention is provided with a heat-insulating cover, a thermocouple and a resistance wire, which can slow down the temperature loss and can always maintain the optimal casting temperature between 30°C and 40°C above the liquidus temperature, and can achieve excellent electromagnetic energy treatment effect. Description of the drawings:

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of a pretreatment tank for semi-continuous casting electromagnetic energy grain refinement in Example 1;

[0024] Figure 2 for Figure 1 A partial cross-sectional view of

[0025] Figure 3 This is a schematic diagram of a tank body for a semi-continuous casting electromagnetic energy grain refinement pretreatment tank in Example 1;

[0026] Figure 4 This is a schematic diagram of a heat preservation cover for a semi-continuous casting electromagnetic energy grain refinement pretreatment tank in Example 1;

[0027] Figure 5 This is a usage state diagram of a semi-continuous casting electromagnetic energy grain refinement pretreatment tank in Example 1;

[0028] Figure 6 This is another use state diagram of a semi-continuous casting electromagnetic energy grain refinement pretreatment tank according to Example 1;

[0029] Figure 7This is a schematic diagram of the magnetic flux of an electromagnetic energy grain refinement pretreatment tank used for semi-continuous casting in Example 1.

[0030] Figure 8 This is a schematic diagram of a U-shaped silicon steel core formed by laminating multiple layers of high magnetic induction oriented silicon steel sheets in Example 1.

[0031] In the figure: tank body 1, insulation cover 2, preset hole 3, hook 4, connecting port 5, U-shaped silicon steel core 6, magnetic induction coil 7, baffle 8. Specific implementation method:

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] A semi-continuous casting electromagnetic energy grain refinement pretreatment tank, comprising a rectangular tank body 1 and a heat preservation cover 2 arranged on the tank body 1, the size of the tank body 1 is 800mm×600mm×200mm in length×width×height. The tank body 1 is fixed on a special bracket, and is provided with preset holes 3 around it for placing special heat preservation resistance wires and thermocouples, and is wrapped with 304 austenitic stainless steel on the outside to ensure its strength.

[0035] The insulation cover 2 is wrapped with 304 austenitic stainless steel to support its overall structure, and is provided with a hook 4. The interior is made of high temperature resistant material to achieve the effect of heat preservation. According to the actual casting speed, flow rate and other characteristics, the dimensions of the insulation cover 2 are 800mm×600mm×50mm in length×width×height, and a 10mm groove is provided on the edge to facilitate the placement of the insulation cap on the tank body 1;

[0036] Two connecting ports 5 are provided on the two opposite walls of the tank body 1, and bolt connection devices are provided on the connecting ports 5; two pairs of U-shaped silicon steel cores 6 are fixedly provided on the heat preservation cover 2 and the tank body 1, and the diameter of the U-shaped silicon steel core 6 is 50mm, and the center distance between the two end columns is 300mm. The four end columns of each pair of U-shaped silicon steel cores 6 are in the same straight line, and a hollow copper tube magnetic induction coil 7 is wound on each end column of the U-shaped silicon steel core, and the two ends of the magnetic induction coil 7 are connected to the power supply, and the magnetic induction coil 7 is connected to the compressed air source, and the magnetic induction coil 7 uses compressed air for cooling; four baffles 8 are provided in the middle position of the tank body and near the two connecting ports 5, and the thickness of the baffle 8 is 30mm, and the plate surface of the baffle 8 is perpendicular to the line between the two connecting ports 5, which can reduce the flow rate and increase the residence time of the melt.

[0037] In this embodiment, the U-shaped silicon steel core 6 located on the insulation cover 2 has two end columns penetrating the insulation cover 2 and is placed in the tank body 1, and the bottom ends of the end columns are about 10 mm away from the melt surface.

[0038] Each U-shaped silicon steel core 6 can form a closed loop magnetic field to process the melt, but the pulse power supply and coil winding method can be adjusted between the two upper and lower U-shaped silicon steel cores to connect the magnetic flux between the two U-shaped silicon steel cores. The tank body 1 is wrapped with 304 austenitic stainless steel. The tank body 1 itself does not have magnetic conductivity, and the magnetic field will not be conducted away by the tank body 1.

[0039] Working principle:

[0040] When in use, the two connecting ports 5 of the trough body 1 are respectively connected to the flow trough and the casting plate of the semi-continuous casting system by bolts, and the hollow copper tube magnetic induction coil 7 is connected to compressed air and pulse current to release the magnetic field; the melt flows into the trough body 1 from the flow trough, and the residence time in the trough body 1 is increased due to the increase in the longitudinal cross-section and the blocking of the baffle 8; when the melt passes through the trough body 1, it is affected by the top and bottom composite double-pulse magnetic field, which improves the nucleation rate; at the same time, the thermocouple monitors the trough wall temperature in real time, indirectly reflects the melt temperature, and heats the melt through the resistance wire, and performs temperature compensation on the melt, so that the melt temperature is always maintained between 30°C and 40°C above the liquidus temperature, so as to achieve excellent electromagnetic energy treatment effect.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pretreatment tank for semi-continuous casting electromagnetic energy grain refinement, characterized in that: It comprises a trough body and a heat-insulating cover arranged on the trough body, two communicating ports are arranged on two opposite trough walls of the trough body, at least one pair of U-shaped silicon steel cores are fixed on the heat-insulating cover and the trough body, each pair of the U-shaped silicon steel cores are respectively fixed on the heat-insulating cover and the trough body, four end posts of each pair of the U-shaped silicon steel cores are all in the same straight line, a magnetic induction coil is wound on each end post of the U-shaped silicon steel core, and both ends of the magnetic induction coil are connected to a power source; A U-shaped silicon steel core is arranged on the upper part of the insulation cover, and its two end columns penetrate the insulation cover and are placed in the tank body; a plurality of baffles are vertically arranged inside the tank body, and the plurality of baffles are staggered in the tank body, and the planes where the baffles are located intersect with the connecting line between the two connecting ports.

2. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 1, characterized in that: The magnetic induction coil is a hollow copper tube, and the hollow copper tube is connected to a cooling air source.

3. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 1, characterized in that: A resistance wire and a thermocouple are arranged inside the groove wall of the groove body.

4. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 1, characterized in that: A hook is arranged on the upper part of the heat-insulating cover.

5. The electromagnetic energy grain refining pretreatment tank for semi-continuous casting according to claim 1, characterized in that: A groove which is engaged with the trough body is arranged at the lower edge of the heat-insulating cover.

6. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 1, characterized in that: The U-shaped silicon steel core is formed by laminating multiple layers of high magnetic induction oriented silicon steel sheets.

7. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 1, characterized in that: The trough body is a rectangular structure, and the two communicating ports are respectively opened in the middle of two opposite trough walls. Four baffles are provided in the middle position inside the trough body and near the two communicating ports, and the plate surface of the baffle is perpendicular to the line between the two communicating ports.

8. The electromagnetic energy grain refinement pretreatment tank for semi-continuous casting according to claim 7, characterized in that: The dimensions of the trough body are 300-1000 mm in length, 200-900 mm in width, and 100-500 mm in height.

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