Semi-continuous casting growth stage grain refinement device

Abstract

The invention belongs to the technical field of metal material preparation, and particularly relates to a semi-continuous casting growth 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; and the ultrasonic vibration device is arranged on one side of the crystallizer, the vibration end of the ultrasonic vibration device is located below the crystallizer, and the vibration end of the ultrasonic vibration device makes contact with the side wall of the casting blank. The vibration end of the ultrasonic vibration device abuts against the side wall close to the casting blank and is arranged below the crystallizer, ultrasonic acts on the grain growth stage of the semi-continuous casting process, the internal quality of the semi-continuous casting blank is improved through the cavitation effect and the acoustic streaming effect of the ultrasonic, and the problem that the structure of the semi-continuous casting blank is not uniform 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 growth 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] In the semi-continuous casting process, due to the contact between the molten metal and the crystallizer, the quenching effect of the crystallizer causes the molten metal to begin nucleation and growth, which results in a small grain size at the edge of the continuous casting billet, while the cooling rate of the core of the continuous casting billet is slow and the grain size is large, which leads to uneven organization of the continuous casting billet. The larger the size of the continuous casting billet, the more obvious the organizational inhomogeneity. Therefore, inhibiting the growth process of the grains will be beneficial to obtaining a microstructure with uniform grain refinement. Therefore, a semi-continuous casting growth stage grain refinement device is urgently needed to solve this problem. Summary of the invention

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

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

[0006] A semi-continuous casting growth 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, a vibration end of the ultrasonic vibration device is located below the crystallizer, and the vibration end of the ultrasonic vibration device is arranged in contact with the side wall of the casting billet.

[0009] Preferably, the vibration end of the ultrasonic vibration device is located 5-20 mm below the crystallizer.

[0010] 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 one end of an ultrasonic tool head, the ultrasonic tool head is located 5-20 mm below the crystallizer, and the other end of the ultrasonic tool head is arranged in contact with the outer wall of the ingot.

[0011] Preferably, the ultrasonic tool head is 100-150 mm in length.

[0012] Preferably, the ultrasonic tool head has a diameter of 20-40 mm.

[0013] Preferably, the ultrasonic frequency of the ultrasonic generator is 19-21 kHz.

[0014] Preferably, the ultrasonic power of the ultrasonic generator is 100-3000W.

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

[0016] When in use, the present invention places the vibration end of the ultrasonic vibration device in contact with the side wall of the ingot and arranges it below the crystallizer, so that ultrasound acts on the grain growth stage of the semi-continuous casting process, and utilizes the cavitation effect and acoustic streaming effect of ultrasound to improve the internal quality of the semi-continuous casting ingot and improve the problem of uneven structure of the semi-continuous casting ingot. 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] Among them, 1. crystallizer; 2. ultrasonic generator; 3. ultrasonic transducer; 4. amplitude transformer; 5. ultrasonic tool head; 6. molten metal; 7. ingot. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] Embodiment 1:

[0023] Reference Figure 1This embodiment discloses a semi-continuous casting growth stage grain refinement device, comprising:

[0024] A crystallizer 1, wherein the liquid inlet end of the crystallizer 1 is used to inject molten metal 6, and the molten metal 6 solidifies at the liquid outlet end of the crystallizer 1 to form a casting 7;

[0025] The ultrasonic vibration device is arranged on one side of the crystallizer 1 , the vibration end of the ultrasonic vibration device is located below the crystallizer 1 , and the vibration end of the ultrasonic vibration device is arranged in contact with the side wall of the casting billet 7 .

[0026] When in use, the present invention places the vibrating end of the ultrasonic vibration device in contact with the side wall of the ingot 7 and is arranged below the crystallizer 1, so that ultrasound acts on the grain growth stage of the semi-continuous casting process, and utilizes the cavitation effect and acoustic streaming effect of ultrasound to improve the internal quality of the semi-continuous casting ingot and improve the problem of uneven structure of the semi-continuous casting ingot.

[0027] According to a further optimized solution, the vibration end of the ultrasonic vibration device is located 5-20 mm below the crystallizer 1.

[0028] A further optimized solution is that the ultrasonic vibration device includes an ultrasonic generator 2, which is electrically connected to an ultrasonic transducer 3, which is transmission-connected to one end of a variable amplitude rod 4, and the other end of the variable amplitude rod 4 is fixedly connected to one end of an ultrasonic tool head 5, and the ultrasonic tool head 5 is located 5-20 mm below the crystallizer 1, and the other end of the ultrasonic tool head 5 is arranged in contact with the outer wall of the ingot 7.

[0029] According to a further optimized solution, the length of the ultrasonic tool head 5 is 100-150 mm.

[0030] According to the further optimized solution, the diameter of the ultrasonic tool head 5 is 20-40 mm.

[0031] According to a further optimization scheme, the ultrasonic frequency of the ultrasonic generator 1 is 19-21 kHz.

[0032] According to a further optimization scheme, the ultrasonic power of the ultrasonic generator 1 is 100-3000W.

[0033] Embodiment 2:

[0034] This embodiment is an application example of Embodiment 1.

[0035] The ultrasonic power of the ultrasonic generator 2 is set to 1000W, and the ultrasonic frequency is set to 20kHz. The ultrasonic generator 2 is electrically connected to the ultrasonic transducer 3, and the output end of the ultrasonic transducer 3 is fixed to one end of the horn 4. The other end of the horn 4 is threadedly connected to one end of the ultrasonic tool head 5. The other end of the ultrasonic tool head 5 abuts on the side wall of the ingot 7. The ultrasonic tool head 5 is located 10mm below the crystallizer 1. The ultrasonic tool head 5 is 100mm long and 30mm in diameter. The ultrasonic tool head 5 is driven by the horn 4 to vibrate. The ultrasonic tool head 5 abuts against the side wall of the ingot 7. The ultrasonic vibration is transmitted through the side wall of the ingot 7 to the molten metal 6 that has not yet solidified in the liquid cavity. The grains that are growing at the junction of the molten metal 6 and the ingot 7 are broken and fine under the action of the ultrasonic vibration. Only tiny grains can be formed, which inhibits the growth of grains, thereby improving the internal quality of the ingot 7 and improving the problem of uneven structure of the semi-continuous casting ingot.

[0036] 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.

[0037] 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 growth stage grain refinement device, characterized in that: include: A crystallizer (1), wherein the liquid inlet end of the crystallizer (1) is used to inject molten metal (6), and the molten metal (6) solidifies at the liquid outlet end of the crystallizer (1) to form a cast billet (7); An ultrasonic vibration device is arranged on one side of the crystallizer (1), the vibration end of the ultrasonic vibration device is located below the crystallizer (1), and the vibration end of the ultrasonic vibration device is arranged in contact with the side wall of the casting billet (7).

2. A semi-continuous casting growth stage grain refinement device according to claim 1, characterized in that: The vibration end of the ultrasonic vibration device is located 5-20 mm below the crystallizer (1).

3. A semi-continuous casting growth stage grain refinement device according to claim 2, characterized in that: The ultrasonic vibration device comprises an ultrasonic generator (2), the ultrasonic generator (2) is electrically connected to an ultrasonic transducer (3), the ultrasonic transducer (3) is transmission-connected to one end of a variable amplitude rod (4), the other end of the variable amplitude rod (4) is fixedly connected to one end of an ultrasonic tool head (5), the ultrasonic tool head (5) is located 5-20 mm below the crystallizer (1), and the other end of the ultrasonic tool head (5) is arranged in contact with the outer wall of the ingot (7).

4. The semi-continuous casting growth stage grain refinement device according to claim 3, characterized in that: The ultrasonic tool head (5) has a length of 100-150 mm.

5. The semi-continuous casting growth stage grain refinement device according to claim 4, characterized in that: The ultrasonic tool head (5) has a diameter of 20-40 mm.

6. The semi-continuous casting growth stage grain refinement device according to claim 3, characterized in that: The ultrasonic frequency of the ultrasonic generator (1) is 19-21 kHz.

7. The semi-continuous casting growth stage grain refinement device according to claim 6, characterized in that: The ultrasonic power of the ultrasonic generator (1) is 100-3000W.

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