Semi-continuous casting nucleation stage grain refinement device

Abstract

The invention belongs to the technical field of metal material preparation, and particularly relates to a semi-continuous casting nucleation stage grain refinement device which comprises a crystallizer, the liquid inlet end of the crystallizer is used for injecting molten metal, and the molten metal is solidified at the liquid outlet end of the crystallizer to form a casting blank; the ultrasonic vibration device is arranged on one side of the crystallizer, the vibration end of the ultrasonic vibration device is located below the liquid level of the molten metal and is close to the liquid level of the molten metal, and a distance is formed between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer. The vibration end of the ultrasonic vibration device is arranged below the liquid level of molten metal and in the area close to the inner wall of the crystallizer, when the molten metal forms a casting blank, heat of the molten metal located on the outer side is prone to loss, and nodules are prone to being generated firstly, the vibration area acts on the nucleation stage of the semi-continuous casting process, and therefore the casting blank is formed. The internal quality of a semi-continuous casting blank is improved by utilizing the cavitation effect and the acoustic streaming effect of ultrasound, grains are refined, and the solute segregation problem is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a grain refinement device in a semi-continuous casting nucleation stage. Background Art

[0002] Semi-continuous casting is an advanced casting method. Its principle is to continuously pour molten metal into a crystallizer, solidify it into a billet, and continuously pull it out from the other end of the crystallizer. It can obtain billets of any length or a specific length. However, semi-continuous casting also has disadvantages such as internal solute element segregation and large core grain size. In recent years, power ultrasound has become a hot topic of research because it produces cavitation effect, acoustic streaming effect, thermal effect, etc. when propagating in a liquid medium to improve the internal structure quality of the continuous casting billet.

[0003] Since ultrasonic propagation is directional, the cavitation effect it produces in the liquid has a small range, which makes it easy to produce larger nodules outside the vibration range, affecting the quality of the continuous casting billet. Therefore, a grain refinement device in the nucleation stage of semi-continuous casting is urgently needed to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a grain refinement device in the semi-continuous casting nucleation stage to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A semi-continuous casting nucleation stage grain refinement device, characterized by comprising:

[0007] A crystallizer, wherein the liquid inlet end of the crystallizer is used to inject molten metal, and the molten metal solidifies at the liquid outlet end of the crystallizer to form a casting billet;

[0008] An ultrasonic vibration device is arranged on one side of the crystallizer, the vibration end of the ultrasonic vibration device is located below the liquid metal surface and close to the liquid metal surface, and a distance is set between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer.

[0009] Preferably, the vibration end of the ultrasonic vibration device is located 10-20 mm below the surface of the molten metal.

[0010] Preferably, the distance between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer is 10-30 mm.

[0011] Preferably, the ultrasonic vibration device includes an ultrasonic generator, the ultrasonic generator is electrically connected to an ultrasonic transducer, the ultrasonic transducer is transmission-connected to one end of a variable amplitude rod, the other end of the variable amplitude rod is fixedly connected to an ultrasonic vibration ring through a connecting rod, the ultrasonic vibration ring is located 10-20 mm below the liquid surface of the molten metal, and the distance between the outer edge of the ultrasonic vibration ring and the inner wall of the crystallizer is 10-30 mm.

[0012] Preferably, the ultrasonic vibration ring has a thickness of 5-10 mm and a height of 10-30 mm.

[0013] Preferably, the cross-section of the connecting rod is a 20 mm square, and the length of the connecting rod is 200-300 mm.

[0014] Preferably, the ultrasonic generator has an ultrasonic frequency of 19-21 kHz and an ultrasonic power of 100-3000 W.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects:

[0016] When in use, the present invention sets the vibration end of the ultrasonic vibration device in an area below the liquid surface of the molten metal and close to the inner wall of the crystallizer. Since the heat of the molten metal located on the outside is easy to dissipate when the molten metal forms the ingot, and nodules are likely to be produced first, the device will use the vibration area to act on the nucleation stage of the semi-continuous casting process, and use the ultrasonic cavitation effect and acoustic streaming effect to improve the internal quality of the semi-continuous casting ingot, refine the grains, and improve the solute segregation problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 A top view of the ultrasonic vibration ring of the present invention;

[0020] Among them, 1. ultrasonic generator; 2. ultrasonic transducer; 3. amplitude transformer; 4. ultrasonic vibration ring; 5. crystallizer; 6. molten metal; 7. ingot. DETAILED DESCRIPTION

[0021] 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.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Embodiment 1:

[0024] Reference Figure 1 to Figure 2 This embodiment discloses a semi-continuous casting nucleation stage grain refinement device, comprising:

[0025] A crystallizer 5, wherein the liquid inlet end of the crystallizer 5 is used to inject the molten metal 6, and the molten metal 6 solidifies at the liquid outlet end of the crystallizer 5 to form a casting slab 7;

[0026] The ultrasonic vibration device is arranged on one side of the crystallizer 5 , the vibration end of the ultrasonic vibration device is located below the liquid metal 6 surface and is arranged close to the liquid metal 6 surface, and a distance is set between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer 5 .

[0027] When in use, the present invention sets the vibration end of the ultrasonic vibration device in an area below the liquid surface of the molten metal 6 and close to the inner wall of the crystallizer 5. Since the heat of the molten metal 6 located on the outside is easy to dissipate when the molten metal 6 forms the ingot 7, it is easy to produce nodules first. The device uses the cavitation effect and acoustic streaming effect of ultrasound to improve the internal quality of the semi-continuous casting ingot 7, refine the grains, and improve the solute segregation problem.

[0028] According to a further optimized solution, the vibration end of the ultrasonic vibration device is located 10-20 mm below the surface of the molten metal 6 .

[0029] According to a further optimization scheme, the distance between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer 5 is 10-30 mm.

[0030] A further optimized solution is provided, wherein the ultrasonic vibration device comprises an ultrasonic generator 1, the ultrasonic generator 1 is electrically connected to an ultrasonic transducer 2, the ultrasonic transducer 2 is transmission-connected to one end of a variable amplitude rod 3, the other end of the variable amplitude rod 3 is fixedly connected to an ultrasonic vibration ring 4 through a connecting rod, the ultrasonic vibration ring 4 is located 10-20 mm below the liquid surface of the molten metal 6, and the distance between the outer edge of the ultrasonic vibration ring 4 and the inner wall of the crystallizer 5 is 10-30 mm.

[0031] According to a further optimization scheme, the thickness of the ultrasonic vibration ring 4 is 5-10 mm and the height is 10-30 mm.

[0032] Further optimization scheme, the cross section of the connecting rod is 20mm square, and the length of the connecting rod is 200-300mm.

[0033] According to the further optimization scheme, the ultrasonic frequency of the ultrasonic generator 1 is 19-21kHz, and the ultrasonic power is 100-3000W.

[0034] Embodiment 2:

[0035] This embodiment is a specific application example of Embodiment 1.

[0036] The ultrasonic power of the ultrasonic generator 1 is set to 100W, and the ultrasonic frequency is set to 20kHz. The ultrasonic generator 1 is electrically connected to the ultrasonic transducer 2, and the output end of the ultrasonic transducer 2 is fixedly connected to one end of the horn 3. The other end of the horn 3 is threadedly connected to the top end of the connecting rod, and the bottom end of the connecting rod is fixedly connected to the ultrasonic vibration ring 4. The ultrasonic vibration ring 4 is driven to vibrate by the horn 3. The ultrasonic vibration ring 4 is placed 10mm below the surface of the molten metal, and the outer edge of the ultrasonic vibration ring 4 is 10mm away from the crystallizer. When nodules are generated near the inner wall of the crystallizer 5, the nodules are broken by the action of ultrasonic vibration, and only tiny grains can be formed, which inhibits grain growth, thereby improving the internal quality of the ingot 7 and improving the solute segregation problem.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A semi-continuous casting nucleation stage grain refinement device, characterized in that: include: A crystallizer (5), wherein the liquid inlet end of the crystallizer (5) is used to inject the molten metal (6), and the molten metal (6) solidifies at the liquid outlet end of the crystallizer (5) to form a cast billet (7); An ultrasonic vibration device is arranged on one side of the crystallizer (5), the vibration end of the ultrasonic vibration device is located below the liquid surface of the molten metal (6) and is arranged close to the liquid surface of the molten metal (6), and a distance is provided between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer (5).

2. The semi-continuous casting nucleation stage grain refinement device according to claim 1, characterized in that: The vibration end of the ultrasonic vibration device is located 10-20 mm below the surface of the molten metal (6).

3. The semi-continuous casting nucleation stage grain refinement device according to claim 2, characterized in that: The distance between the outer edge of the vibration end of the ultrasonic vibration device and the inner wall of the crystallizer (5) is 10-30 mm.

4. The semi-continuous casting nucleation stage grain refinement device according to claim 3, characterized in that: The ultrasonic vibration device comprises an ultrasonic generator (1), the ultrasonic generator (1) is electrically connected to an ultrasonic transducer (2), the ultrasonic transducer (2) is transmission-connected to one end of a variable amplitude rod (3), the other end of the variable amplitude rod (3) is fixedly connected to an ultrasonic vibration ring (4) via a connecting rod, the ultrasonic vibration ring (4) is located 10-20 mm below the liquid surface of the molten metal (6), and the distance between the outer edge of the ultrasonic vibration ring (4) and the inner wall of the crystallizer (5) is 10-30 mm.

5. The semi-continuous casting nucleation stage grain refinement device according to claim 4, characterized in that: The ultrasonic vibration ring (4) has a thickness of 5-10 mm and a height of 10-30 mm.

6. The semi-continuous casting nucleation stage grain refinement device according to claim 4, characterized in that: The cross section of the connecting rod is a 20 mm square, and the length of the connecting rod is 200-300 mm.

7. The semi-continuous casting nucleation stage grain refinement device according to claim 4, characterized in that: The ultrasonic generator (1) has an ultrasonic frequency of 19-21 kHz and an ultrasonic power of 100-3000 W.

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