Semi-continuous casting whole process grain refinement device
By setting up a multi-source ultrasonic processing device during semi-continuous casting, the grain nucleation and growth are suppressed, and the grain structure of the casting blank is refined, which solves the problem of large grain size in semi-continuous casting and improves the casting blank Internal quality.
Patent Information
- Application Number
- CN202411203747.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2024-12-10
AI Technical Summary
During the semi-continuous casting process, the ultrasonic source is single and only acts on the solidified end of the metal melt or casting billet, resulting in the segregation of the internal solute element and the grain size are too large, which affects the quality of the casting billet. A whole-process grain refining device is needed. .
A semi-continuous casting process grain refining device is designed, including a multi-source ultrasonic processing device at the nucleation stage, growth stage and liquid hole solidification end of the crystallizer, which is located below the metal liquid surface and casting through the vibration end Multi-source ultrasonic treatment of the side wall contact of the blank inhibits the grain nucleation and growth, breaks the dendrites, and refines the grain structure of the continuous cast blank.
Through multi-source ultrasonic treatment, the grain nucleation and growth of the semi-continuous casting metal is suppressed, and the grain structure of the continuous casting billet is refined, and the internal quality of the metal continuous casting billet is improved.
Smart Images
Figure CN119098565A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a semi-continuous casting whole-process grain refinement device. 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 the propagation of ultrasound is directional, the cavitation effect it produces in the liquid has a small range of action, which makes it easy to produce large nodules outside the vibration range, affecting the quality of the continuous casting billet. The existing patent only sets a single ultrasonic source, and it only acts on the solidification end of the metal melt or the casting billet. During the semi-continuous casting process, the metal liquid contacts the crystallizer, and nucleation begins due to the chilling effect of the crystallizer. During the billet drawing process, the grain casting grows. The above processes will affect the grain size and performance of the continuous casting billet. Therefore, inhibiting the nucleation and growth process of the grains will be beneficial to obtaining a microstructure with uniform grain refinement. Therefore, a semi-continuous casting whole-process grain refinement device is urgently needed to solve this problem. Summary of the invention
[0004] The purpose of the present invention is to provide a semi-continuous casting whole process 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 whole process grain refinement device, 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] A nucleation stage ultrasonic processing device is arranged on one side of the crystallizer, wherein the vibration end of the nucleation stage ultrasonic processing device is located below the liquid surface of the molten metal and is arranged close to the liquid surface of the molten metal, and a distance is set between the outer edge of the vibration end of the nucleation stage ultrasonic processing device and the inner wall of the crystallizer;
[0009] A growth stage ultrasonic processing device is arranged at one side of the crystallizer, wherein the vibration end of the growth stage ultrasonic processing device is located below the crystallizer, and the vibration end of the growth stage ultrasonic processing device is arranged in contact with the side wall of the casting billet;
[0010] The ultrasonic treatment device for the end of liquid cavity solidification is arranged above the crystallizer, and the vibration end of the ultrasonic treatment device for the end of liquid cavity solidification is vertically inserted into the metal liquid.
[0011] Preferably, the vibration end of the ultrasonic treatment device in the nucleation stage is located 10-20 mm below the surface of the molten metal.
[0012] Preferably, the distance between the outer edge of the vibration end of the ultrasonic treatment device in the nucleation stage and the inner wall of the crystallizer is 10-30 mm.
[0013] Preferably, the ultrasonic processing device in the nucleation stage includes a first ultrasonic generator, the first ultrasonic generator is electrically connected to a first ultrasonic transducer, the first ultrasonic transducer is transmission-connected to one end of a first amplitude transformer, the other end of the first amplitude transformer 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.
[0014] Preferably, the ultrasonic vibration ring has a thickness of 5-10 mm and a height of 10-30 mm.
[0015] Preferably, the cross-section of the connecting rod is a 20 mm square, and the length of the connecting rod is 200-300 mm.
[0016] Preferably, the ultrasonic frequency of the first ultrasonic generator is 19-21 kHz, and the ultrasonic power is 100-3000W.
[0017] Preferably, the vibrating end of the ultrasonic treatment device in the growth stage is located 5-20 mm below the crystallizer.
[0018] Preferably, the growth stage ultrasonic processing device includes a second ultrasonic generator, the second ultrasonic generator is electrically connected to a second ultrasonic transducer, the second ultrasonic transducer is transmission-connected to one end of a second amplitude-changing rod, the other end of the second amplitude-changing rod is fixedly connected to one end of a second ultrasonic tool head, the second ultrasonic tool head is located 5-20 mm below the crystallizer, and the other end of the second ultrasonic tool head is arranged in contact with the outer wall of the ingot.
[0019] Preferably, the second ultrasonic tool head has a length of 100-150 mm and a diameter of 20-40 mm.
[0020] Preferably, the ultrasonic frequency of the second ultrasonic generator is 19-21 kHz, and the ultrasonic power is 100-3000W.
[0021] Preferably, the ultrasonic processing device at the end of liquid cavity solidification includes a third ultrasonic generator, the third ultrasonic generator is electrically connected to a third ultrasonic transducer, the third ultrasonic transducer is transmission-connected to the top end of a third amplitude transformer, the bottom end of the third amplitude transformer is fixedly connected to a third ultrasonic tool head, the third ultrasonic tool head is vertically inserted into the center of the molten metal, and the bottom end of the third ultrasonic tool head is located 30-300 mm below the liquid surface of the molten metal.
[0022] Preferably, the third ultrasonic tool head has a length of 300-500 mm and a diameter of 20-40 mm.
[0023] Preferably, the ultrasonic frequency of the third ultrasonic generator is 19-21 kHz, and the ultrasonic power is 100-3000W.
[0024] Compared with the prior art, the present invention has the following advantages and technical effects:
[0025] When used, the present invention applies multi-source ultrasonic treatment during the entire process of semi-continuous casting metal solidification to inhibit the nucleation and growth of grains, break the dendrites at the end of liquid cavity solidification, refine the grain structure of the continuous casting billet, and improve the quality of the metal continuous casting billet. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] 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:
[0027] Figure 1 It is a schematic diagram of the structure of the present invention;
[0028] Figure 2 A top view of the ultrasonic vibration ring of the present invention;
[0029] Among them, 1. the first ultrasonic generator; 2. the first ultrasonic transducer; 3. the first amplitude transformer; 4. the ultrasonic vibration ring; 5. the crystallizer; 6. the second ultrasonic generator; 7. the second ultrasonic transducer; 8. the second amplitude transformer; 9. the second ultrasonic tool head; 10. the molten metal; 11. the ingot; 12. the third ultrasonic generator; 13. the third ultrasonic transducer; 14. the third amplitude transformer; 15. the third ultrasonic tool head. DETAILED DESCRIPTION
[0030] 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.
[0031] 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.
[0032] Embodiment 1:
[0033] Reference Figure 1 to Figure 2 This embodiment discloses a semi-continuous casting whole process grain refinement device, comprising:
[0034] A crystallizer 5, wherein the liquid inlet end of the crystallizer 5 is used to inject the molten metal 10, and the molten metal 10 solidifies at the liquid outlet end of the crystallizer 5 to form a casting billet 11;
[0035] The nucleation stage ultrasonic treatment device is arranged on one side of the crystallizer 5, the vibration end of the nucleation stage ultrasonic treatment device is located below the liquid surface of the molten metal 10 and is arranged close to the liquid surface of the molten metal 10, and a distance is set between the outer edge of the vibration end of the nucleation stage ultrasonic treatment device and the inner wall of the crystallizer 5;
[0036] The growth stage ultrasonic processing device is arranged on one side of the crystallizer 5, the vibration end of the growth stage ultrasonic processing device is located below the crystallizer 5, and the vibration end of the growth stage ultrasonic processing device is arranged in contact with the side wall of the casting billet 11;
[0037] The ultrasonic treatment device for the end of liquid cavity solidification is arranged above the crystallizer 5 , and the vibrating end of the ultrasonic treatment device for the end of liquid cavity solidification is vertically inserted into the molten metal 10 .
[0038] When used, the present invention applies multi-source ultrasonic treatment during the entire process of semi-continuous casting metal solidification to inhibit the nucleation and growth of grains, break the dendrites at the end of liquid cavity solidification, refine the grain structure of the continuous casting billet, and improve the quality of the metal continuous casting billet.
[0039] According to a further optimized solution, the vibration end of the ultrasonic treatment device during the nucleation stage is located 10-20 mm below the surface of the molten metal 10 .
[0040] According to a further optimization scheme, the distance between the outer edge of the vibration end of the ultrasonic treatment device and the inner wall of the crystallizer 5 during the nucleation stage is 10-30 mm.
[0041] A further optimized solution is provided, in which the ultrasonic processing device in the nucleation stage comprises a first ultrasonic generator 1, the first ultrasonic generator 1 is electrically connected to a first ultrasonic transducer 2, the first ultrasonic transducer 2 is transmission-connected to one end of a first amplitude transformer 3, the other end of the first amplitude transformer 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 10, 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.
[0042] 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.
[0043] Further optimization scheme, the cross section of the connecting rod is 20mm square, and the length of the connecting rod is 200-300mm.
[0044] According to a further optimization scheme, the ultrasonic frequency of the first ultrasonic generator 1 is 19-21kHz, and the ultrasonic power is 100-3000W.
[0045] According to a further optimized solution, the vibration end of the ultrasonic treatment device during the growth stage is located 5-20 mm below the crystallizer 5.
[0046] A further optimized solution is that the ultrasonic processing device in the growth stage includes a second ultrasonic generator 6, the second ultrasonic generator 6 is electrically connected to a second ultrasonic transducer 7, the second ultrasonic transducer 7 is transmission-connected to one end of a second amplitude-changing rod 8, the other end of the second amplitude-changing rod 8 is fixedly connected to one end of a second ultrasonic tool head 9, the second ultrasonic tool head 9 is located 5-20 mm below the crystallizer 5, and the other end of the second ultrasonic tool head 9 is arranged in contact with the outer wall of the ingot 11.
[0047] According to a further optimized solution, the second ultrasonic tool head 9 has a length of 100-150 mm and a diameter of 20-40 mm.
[0048] According to a further optimization scheme, the ultrasonic frequency of the second ultrasonic generator 6 is 19-21 kHz, and the ultrasonic power is 100-3000 W.
[0049] A further optimized solution is that the ultrasonic processing device at the end of liquid cavity solidification includes a third ultrasonic generator 12, the third ultrasonic generator 12 is electrically connected to a third ultrasonic transducer 13, the third ultrasonic transducer 13 is transmission-connected to the top end of a third amplitude transformer 14, the bottom end of the third amplitude transformer 14 is fixedly connected to a third ultrasonic tool head 15, the third ultrasonic tool head 15 is vertically inserted into the center of the molten metal 10, and the bottom end of the third ultrasonic tool head 15 is located 30-300 mm below the liquid surface of the molten metal 10.
[0050] According to a further optimized solution, the third ultrasonic tool head 15 has a length of 300-500 mm and a diameter of 20-40 mm.
[0051] According to a further optimization scheme, the ultrasonic frequency of the third ultrasonic generator 12 is 19-21 kHz, and the ultrasonic power is 100-3000 W.
[0052] Embodiment 2:
[0053] This embodiment is an application example of Embodiment 1.
[0054] This embodiment includes a nucleation stage ultrasonic processing device, a growth stage ultrasonic processing device and a cavitation solidification terminal ultrasonic processing device.
[0055] The ultrasonic treatment device in the semi-continuous casting nucleation stage includes a first ultrasonic generator 1, a first ultrasonic transducer 2, a first horn 3 and an ultrasonic vibration ring 4; the first ultrasonic generator 1 and the first ultrasonic transducer 2 are electrically connected; the first horn 3 is threadedly connected to the top of the connecting rod, the bottom of the connecting rod is fixedly connected to the ultrasonic vibration ring 4, the ultrasonic vibration ring 4 is placed 10 mm below the liquid surface of the molten metal 10, and the outer edge of the ultrasonic vibration ring 4 is 20 mm away from the crystallizer. The ultrasonic vibration ring 4 is placed 10 mm below the liquid surface of the molten metal, and the outer edge of the ultrasonic vibration ring 4 is 10 mm away from the crystallizer. The straight wall section of the connecting rod is 20*20 mm, the length is 200 mm, the ultrasonic vibration ring 4 is 5 mm thick, and the height is 20 mm; the ultrasonic frequency of the first ultrasonic generator is 20 kHz, and the ultrasonic power is 100 W.
[0056] The ultrasonic treatment device for the semi-continuous casting grain growth stage includes a second ultrasonic generator 6, a second ultrasonic transducer 7, a second horn 8 and a second ultrasonic tool head 9; the second ultrasonic generator 6 and the second ultrasonic transducer 7 are electrically connected; the second horn 8 is threadedly connected to the second ultrasonic tool head 9, and the second ultrasonic tool head 9 is placed 10 mm below the crystallizer 5 and contacts the outer wall of the continuous casting billet 11. The second ultrasonic tool head 9 has a length of 100 mm and a diameter of 30 mm. The ultrasonic frequency of the second ultrasonic generator 6 is 20 kHz, and the ultrasonic power is 1000 W.
[0057] The ultrasonic treatment device for the end of the solidification of the semi-continuous casting liquid cavity includes a third ultrasonic generator 12, a third ultrasonic transducer 13, a third horn 14 and a third ultrasonic tool head 15; the third ultrasonic generator 12 and the third ultrasonic transducer 13 are electrically connected; the third horn 14 is threadedly connected to the third ultrasonic tool head 15, and the bottom end of the third ultrasonic tool head 15 penetrates 300mm below the liquid surface of the metal liquid 10. The third ultrasonic tool head 15 is 400mm long and 30mm in diameter. The ultrasonic frequency of the third ultrasonic generator 12 is 20kHz and the ultrasonic power is 3000W. Through such an arrangement, multi-source ultrasonic treatment is applied during the entire process of semi-continuous casting metal solidification to inhibit the nucleation and growth of grains, so that the dendrites at the end of the liquid cavity solidification are broken, which plays a role in refining the grain structure of the continuous casting billet and improving the quality of the metal continuous casting billet.
[0058] 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.
[0059] The above embodiments 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 whole process 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 (10), and the molten metal (10) solidifies at the liquid outlet end of the crystallizer (5) to form a cast billet (11); a nucleation stage ultrasonic processing device, arranged on one side of the crystallizer (5), wherein a vibration end of the nucleation stage ultrasonic processing device is located below the liquid surface of the molten metal (10) and is arranged close to the liquid surface of the molten metal (10), and a distance is provided between the outer edge of the vibration end of the nucleation stage ultrasonic processing device and the inner wall of the crystallizer (5); A growth stage ultrasonic processing device is arranged on one side of the crystallizer (5), the vibration end of the growth stage ultrasonic processing device is located below the crystallizer (5), and the vibration end of the growth stage ultrasonic processing device is arranged in contact with the side wall of the casting billet (11); The liquid cavity solidification end ultrasonic processing device is arranged above the crystallizer (5), and the vibration end of the liquid cavity solidification end ultrasonic processing device is vertically inserted into the metal liquid (10).
2. The semi-continuous casting whole process grain refinement device according to claim 1, characterized in that: The vibration end of the ultrasonic treatment device in the nucleation stage is located 10-20 mm below the liquid surface of the molten metal (10); The distance between the outer edge of the vibration end of the ultrasonic treatment device in the nucleation stage and the inner wall of the crystallizer (5) is 10-30 mm.
3. A semi-continuous casting whole process grain refinement device according to claim 2, characterized in that: The nucleation stage ultrasonic processing device comprises a first ultrasonic generator (1), the first ultrasonic generator (1) is electrically connected to a first ultrasonic transducer (2), the first ultrasonic transducer (2) is transmission-connected to one end of a first amplitude change rod (3), the other end of the first amplitude change 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 (10), 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.
4. The semi-continuous casting whole process grain refinement device according to claim 3, characterized in that: The ultrasonic vibration ring (4) has a thickness of 5-10 mm and a height of 10-30 mm.
5. The semi-continuous casting whole process 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.
6. The semi-continuous casting whole process grain refinement device according to claim 1, characterized in that: The vibrating end of the ultrasonic treatment device in the growth stage is located 5-20 mm below the crystallizer (5).
7. The semi-continuous casting whole process grain refinement device according to claim 6, characterized in that: The growth stage ultrasonic processing device comprises a second ultrasonic generator (6), the second ultrasonic generator (6) is electrically connected to a second ultrasonic transducer (7), the second ultrasonic transducer (7) is transmission-connected to one end of a second amplitude-changing rod (8), the other end of the second amplitude-changing rod (8) is fixedly connected to one end of a second ultrasonic tool head (9), the second ultrasonic tool head (9) is located 5-20 mm below the crystallizer (5), and the other end of the second ultrasonic tool head (9) is arranged in contact with the outer wall of the ingot (11).
8. The semi-continuous casting whole process grain refinement device according to claim 7, characterized in that: The second ultrasonic tool head (9) has a length of 100-150 mm and a diameter of 20-40 mm.
9. The semi-continuous casting whole process grain refinement device according to claim 1, characterized in that: The liquid cavity solidification terminal ultrasonic processing device comprises a third ultrasonic generator (12), the third ultrasonic generator (12) is electrically connected to a third ultrasonic transducer (13), the third ultrasonic transducer (13) is transmission-connected to the top end of a third amplitude-changing rod (14), the bottom end of the third amplitude-changing rod (14) is fixedly connected to a third ultrasonic tool head (15), the third ultrasonic tool head (15) is vertically inserted into the center of the metal liquid (10), and the bottom end of the third ultrasonic tool head (15) is located 30-300 mm below the liquid surface of the metal liquid (10).
10. The semi-continuous casting whole process grain refinement device according to claim 9, characterized in that: The third ultrasonic tool head (15) has a length of 300-500 mm and a diameter of 20-40 mm.