Molten metal pool stabilizing system and method

Abstract

The invention discloses a molten metal pool stabilizing system and method.The molten metal pool stabilizing system comprises a suspension crucible, an electric push rod, a flow guide groove and an induction coil, and the suspension crucible is used for containing molten metal; the electric push rod is arranged above the suspension crucible, the electric push rod comprises a telescopic arm and a rotating arm, one end of the telescopic arm can stretch out and draw back transversely, the other end of the telescopic arm is connected with the rotating arm through a rotating shaft, and the rotating arm is connected with the outer side wall of the suspension crucible; a groove opening of the flow guide groove is formed below the suspension crucible, the flow guide groove comprises a casting pipe and a flow baffle, the lower end of the casting pipe is located above the molten metal pool, and flow holes allowing molten metal to pass through are formed by the two sides of the flow baffle and the groove wall of the flow guide groove; and the induction coil is arranged around the outer side wall of the diversion trench. The molten metal pool stabilizing system provided by the invention can ensure the stability of the physical state of the molten metal pool and control the temperature of the molten metal.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum suspension furnace plate rolling, and in particular to a molten metal pool stabilization system and method. Background Art

[0002] With the development of materials science, the demand for high-performance metals and alloys is increasing, especially in aerospace, electronic equipment and high-tech fields. These materials usually have high melting points and strict requirements on purity, and traditional smelting and rolling processes often make it difficult to achieve efficient production while ensuring metal quality. Therefore, the use of vacuum suspension melting technology has become an effective solution. This technology mainly uses induction heating to heat the metal to a molten state under vacuum or inert gas protection, and keeps it in a suspended state to reduce oxidation and contamination and ensure the high purity of the molten metal.

[0003] The vacuum suspension rolling equipment rolls the molten metal into thin plates, strips or bars through two high-speed rotating rollers. During the rolling process, the state of the molten metal pool is crucial to the quality of the final product, which is mainly reflected in two aspects: first, the physical state of the molten metal pool must be stable to avoid drastic fluctuations or unevenness; second, the temperature of the molten metal needs to be kept in an appropriate range to prevent oxidation or solidification, which has a direct impact on the rolling effect and product quality. Therefore, how to achieve stability and temperature control of the molten metal pool is an important challenge facing this technology. Summary of the invention

[0004] The main purpose of the present invention is to provide a stabilization system and method for a molten metal pool, aiming to provide a system and method that can ensure the stability of the physical state of the molten metal pool and control the temperature of the molten metal pool.

[0005] To achieve the above object, the present invention provides a stabilization system for a molten metal pool, comprising:

[0006] Suspension crucible, used to hold molten metal;

[0007] An electric push rod is arranged above the suspension crucible, the electric push rod comprises a telescopic arm and a rotating arm, one end of the telescopic arm can be laterally telescoped, the other end of the telescopic arm is connected to the rotating arm through a rotating shaft, and the rotating arm is connected to the outer side wall of the suspension crucible;

[0008] A guide groove, wherein the groove opening of the guide groove is arranged below the suspension crucible, the guide groove comprises a casting pipe and a baffle, the lower end of the casting pipe is located above the molten metal pool, and the two sides of the baffle and the groove wall of the guide groove form a flow hole for the molten metal to pass through; and,

[0009] An induction coil is arranged around the outer side wall of the guide groove.

[0010] Preferably, the metal liquid pool stabilization system further comprises:

[0011] The first infrared thermometer is used to monitor the temperature of the poured molten metal in real time;

[0012] The second infrared thermometer is used to monitor the temperature of the diversion trough in real time;

[0013] A smelting power supply cabinet, used for heating the suspension crucible; and

[0014] An induction heating power supply preheats the guide groove through the induction coil.

[0015] Preferably, the molten metal pool stabilization system also includes a smelting operation cabinet, and the smelting operation cabinet remotely controls the smelting power supply cabinet and the induction heating power supply.

[0016] Preferably, the smelting operation cabinet outputs a control program to the electric push rod, and a rotating arm of the electric push rod pushes the suspended crucible.

[0017] Preferably, the groove wall of the guide groove is cylindrical, and the upper plane of the cylinder is an inclined surface.

[0018] Preferably, the groove bottom of the guide groove is disc-shaped, the groove bottom side wall of the guide groove is provided with an internal thread, and the groove wall of the guide groove is provided with an external thread corresponding to the internal thread.

[0019] Preferably, grooves are provided on both sides of the baffle plate in the length direction, and a groove bottom of the guide groove is provided with a groove engaged with the groove.

[0020] Preferably, the inner upper surface of the groove bottom of the guide groove is provided with a certain slope, and a stepped hole is provided near the lower edge of the slope.

[0021] Preferably, the casting tube has an appearance of a long tubular structure, and a longitudinal cross-section is Y-shaped. A stepped ring matching the stepped hole is provided on the outer side of the upper end of the casting tube.

[0022] The present invention also provides a method for stabilizing a molten metal pool, comprising the following steps:

[0023] S1. Add the metal material to be smelted into the suspension crucible, arrange the guide groove at the pouring position, arrange the induction coil around the guide groove, and then close the vacuum chamber, evacuate the vacuum chamber, and fill it with argon gas;

[0024] S2, start the induction heating power supply, preheat the guide trough through the induction coil, use the second infrared thermometer to detect the temperature of the guide trough in real time, when most of the bottom of the guide trough is heated to the set temperature, the smelting operation cabinet outputs the insulation program to stabilize the temperature of the guide trough;

[0025] S3, start the smelting power cabinet, start smelting and use the first infrared thermometer to detect the smelting temperature in real time. After reaching the casting temperature, start the constant temperature program. The smelting operation cabinet adjusts the output power at any time according to the data of the first infrared thermometer;

[0026] S4. Start the automatic furnace turning operation. The molten metal flows down evenly. The flow hits the high side wall of the guide groove, flows down along the side wall and is blocked by the baffle. The molten metal bypasses the flow holes on both sides and flows into the cavity where the casting tube is located. Since the inner hole of the casting tube is relatively thin, after the second flow limiting of the casting tube, the molten metal flows into the gap between the rollers at the required flow rate and flow velocity.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The metal liquid pool stabilization system provided by the present invention realizes the stable dumping of the metal liquid in the suspension crucible by using the electric push rod, the guide groove and the structure of the suspension crucible to stabilize the state of the metal liquid pool between the rollers. At the same time, the servo system and the temperature sensor monitor the state of the liquid pool in real time, and automatically adjust the frequency and power of the induction heating to maintain the stability and suitable temperature of the metal liquid and reduce the defects in the rolling process. These innovative methods provide a solid foundation for the efficient operation of vacuum suspension plate rolling equipment and show broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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 the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of a stabilization system for a molten metal pool of the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of the middle diversion trough;

[0032] Figure 3 for Figure 1 A top view of the middle diversion trough;

[0033] Figure 4 for Figure 1 Schematic diagram of the structure of the electric linear actuator.

[0034] Description of the accompanying drawings of the embodiments provided by the present invention:

[0035]

[0036]

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] 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.

[0039] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] In view of the special requirements of the rolling process on the state of the molten metal pool between the rollers, the present invention proposes a molten metal pool stabilization system 100, referring to Figures 1 to 4 , Figure 1 It is a structural schematic diagram of an embodiment of a stabilization system for a molten metal pool of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the middle diversion trough; Figure 3 for Figure 1 A top view of the middle diversion trough; Figure 4 for Figure 1 The metal liquid pool stabilization system 100 will be described in detail below with reference to the accompanying drawings.

[0042] In the embodiment of the present invention, Figure 1As shown, the molten metal pool stabilization system 100 includes a suspension crucible 1, an electric push rod 2, a guide groove 3 and an induction coil 4. The suspension crucible 1 is used to hold molten metal; the electric push rod 2 is arranged above the suspension crucible 1, and the electric push rod 2 includes a telescopic arm 21 and a rotating arm 22, one end of the telescopic arm 21 can be laterally telescopic, and the other end of the telescopic arm 21 is connected to the rotating arm 22 through a rotating shaft, and the rotating arm 22 is connected to the outer wall of the suspension crucible 1; the notch of the guide groove 3 is arranged below the suspension crucible 1, and the guide groove 3 includes a casting pipe 31 and a baffle 32, the lower end of the casting pipe 31 is located above the molten metal pool, and the two sides of the baffle 32 and the groove wall of the guide groove 3 form a flow hole for the molten metal to pass through; the induction coil 4 is arranged around the outer wall of the guide groove 3, and can heat the molten metal in the guide groove 3.

[0043] The metal liquid pool stabilization system 100 provided by the present invention realizes the stable dumping of the metal liquid in the suspension crucible 1 by using the electric push rod 2, the guide groove 3 and the structure of the suspension crucible 1, thereby realizing the stability of the metal liquid pool state between the rollers 10. At the same time, the servo system and the temperature sensor monitor the liquid pool state in real time, and automatically adjust the frequency and power of the induction heating to maintain the stability and suitable temperature of the metal liquid and reduce the defects in the rolling process. These innovative methods provide a solid foundation for the efficient operation of vacuum suspension plate rolling equipment and show broad application prospects.

[0044] Specifically, please refer to Figure 1 Figure 4 The telescopic arm 21 of the electric push rod 2 includes a servo motor 211, a power transmission mechanism 212 and a positioning cylinder 213. The servo motor 211 first provides power for the telescopic arm 21 to extend and retract, and then transmits it to the power transmission mechanism 212, and then realizes lateral telescopic movement through the positioning cylinder 213, driving the rotating arm 22 to move. Since one end of the rotating arm 22 is connected to the outer side wall of the suspension crucible 1, the rotating arm 22 drives the suspension crucible 1 to rotate and realize the tilting action. The smelting operation cabinet 9 outputs the control program to the electric push rod 2 to accurately control the angle and speed of the tilting. The design of the automation program ensures that the flow rate of the molten metal poured from the suspension crucible 1 is controllable.

[0045] Please refer to Figure 2The baffle plate 32 divides the guide groove 3 into two chambers. The molten metal poured from the suspension crucible 1 first enters the chamber with higher side walls. The higher part protects the molten metal from splashing out during casting. The lateral sides of the baffle plate 32 form flow holes with the side walls of the guide groove 3. The molten metal flows to the other chamber through the flow holes, and then flows to the casting pipe, and then flows to the metal pool through the casting pipe. The flow velocity and flow rate of the molten metal are further slowed down through the guide groove 3, thereby ensuring that the liquid level remains unchanged during the rolling process and the molten metal does not have severe impact during pouring.

[0046] See also Figure 1 Preferably, the metal liquid pool stabilization system 100 also includes a first infrared thermometer 5, a second infrared thermometer 6, a smelting power supply cabinet 7, an induction heating power supply 8 and a smelting operation cabinet 9. The first infrared thermometer 5 is used to monitor the temperature of the molten metal in real time, and transmit the detected temperature data to the smelting operation cabinet 9. After reaching the casting temperature, the constant temperature program is started, and the smelting operation cabinet 9 adjusts the output power at any time according to the data of the first infrared thermometer 5; the second infrared thermometer 6 is used to monitor the temperature of the guide groove 3 in real time, and transmit the detected temperature data to the smelting operation cabinet 9. When most of the bottom of the guide groove 3 is heated to the set temperature, the smelting operation cabinet 9 outputs the insulation program, and the stabilization The temperature of the guide trough 3 is fixed; the smelting power supply cabinet 7 is used to accurately heat the suspension crucible 1 to ensure the temperature control of the molten metal during the smelting process, which can effectively avoid the quality problems of the metal caused by temperature fluctuations and ensure the uniformity and purity of the molten metal; the induction heating power supply 8 preheats the guide trough 3 through the induction coil 4, further improving the thermal efficiency of the overall equipment, reducing energy loss, and ensuring the timeliness and stability of the smelting process; the smelting operation cabinet 9 remotely controls the smelting power supply cabinet 7 and the induction heating power supply 8. The operator does not need to directly contact the high-temperature environment and can perform real-time monitoring and adjustment at a safe distance, which speeds up the response speed and improves the convenience and safety of operation.

[0047] See also Figure 1 Figure 4 Furthermore, the smelting operation cabinet 9 outputs the control program to the electric push rod 2, and the rotating arm 22 of the electric push rod 2 pushes the suspension crucible 1. The rotating arm 22 of the electric push rod 2 can accurately adjust the position and working state of the suspension crucible 1 under the command of the control system. This automated control method not only improves the accuracy of the operation, but also reduces the error caused by human operation, making the suspension smelting process more reliable and stable.

[0048] Preferably, see Figure 1 Figure 2, the groove wall of the guide groove 3 is cylindrical, and the upper plane of the cylinder is an inclined surface. This design can ensure that the molten metal will not splash out during pouring. The groove bottom of the guide groove 3 is disc-shaped, and the groove bottom side wall of the guide groove 3 is provided with an internal thread, and the groove wall of the guide groove 3 is provided with an external thread corresponding to the internal thread. This design can adjust the position of the bottom casting port so that it is aligned with the center of the roller 10. The inner upper surface of the groove bottom of the guide groove 3 is provided with a certain slope, and a stepped hole is provided near the lower edge of the slope. The molten metal can flow along the slope to the stepped hole and then enter the casting pipe. The casting pipe 31 has an appearance of a long tubular structure, and the longitudinal cross-section is Y-shaped. The outer side of the upper end of the casting pipe 31 is provided with a stepped ring matching the stepped hole, and its size matches the stepped hole at the bottom of the guide groove 3.

[0049] See also Figure 2 In order to facilitate the installation and removal of the baffle plate 32, grooves are provided on both sides of the length direction of the baffle plate 32, and a groove engaging with the groove is provided on the bottom of the guide groove 3. By inserting the baffle plate 32 into the groove at the bottom of the guide groove 3, the guide groove 3 can be divided into two chambers.

[0050] The present invention also proposes a method for stabilizing a molten metal pool, which is implemented based on a molten metal pool stabilization system 100. The specific structure of the molten metal pool stabilization system 100 refers to the above embodiment. Since the method for stabilizing a molten metal pool adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The method for stabilizing a molten metal pool includes the following steps:

[0051] S1. Add the metal material to be smelted into the suspension crucible 1, arrange the guide groove 3 at the pouring position to ensure that the molten metal can flow into the predetermined rolling area quickly and smoothly, arrange the induction coil 4 around the guide groove 3 to form an effective heating system, and then close the vacuum chamber and evacuate the vacuum chamber to 6.67×10 -2 PaPa to reduce the oxygen content and avoid metal oxidation, and then fill the vacuum chamber with argon gas to maintain the vacuum chamber pressure at 0.5×10 5 Pa, while providing inert gas protection to ensure the purity and smelting quality of the metal;

[0052] S2, start the induction heating power supply 8, preheat the guide groove 3 through the induction coil 4, provide a suitable temperature environment for the molten metal, reduce the temperature loss of the molten metal during the flow process, use the second infrared thermometer 6 to detect the temperature of the guide groove 3 in real time, when most of the bottom of the guide groove 3 is heated to the set temperature, the smelting operation cabinet 9 outputs the insulation program to stabilize the temperature of the guide groove 3. This temperature preset and maintenance is to improve the efficiency of the subsequent smelting process and the fluidity of the molten metal;

[0053] S3, start the smelting power cabinet 7, start smelting and use the first infrared thermometer 5 to detect the smelting temperature in real time. After reaching the casting temperature, start the constant temperature program. The smelting operation cabinet 9 adjusts the output power at any time according to the data of the first infrared thermometer 5 to keep the temperature consistent and prevent the metal from solidifying or oxidizing. This process ensures the ideal flow state of the molten metal and prepares for subsequent casting;

[0054] S4. Start the automatic furnace turning operation, the molten metal flows down evenly, the flow rate hits the high side wall of the guide groove 3, and is blocked by the baffle plate 32 after flowing down along the side wall. The molten metal bypasses the flow holes on both sides and flows into the chamber where the casting tube 31 is located. This design ensures that the molten metal will not have turbulence or uneven distribution during the transfer and flow process, which is beneficial to maintaining the properties of the molten metal. Since the inner hole of the casting tube 31 is relatively fine, after the second flow limiting of the casting tube 31, the molten metal flows into the gap between the rollers 10 at the required flow rate and flow velocity. This design avoids the problem of overshoot or insufficient flow of the molten metal, thereby contributing to the uniformity of casting and high-quality output.

[0055] The automatic furnace turning operation specifically includes the following steps:

[0056] S41, initialization setting: before the operation starts, the smelting operation cabinet 9 will be initialized according to the preset program. This process includes:

[0057] Confirm the status of the electric push rod 2 to ensure that the servo motor 211, the power transmission mechanism 212 and the positioning cylinder 213 are all operating normally;

[0058] The initial position and the preset tilting angle of the suspension crucible 1 are determined.

[0059] S42, activation of the telescopic arm 21: Once the system initialization is completed, the smelting operation cabinet 9 will start the servo motor 211:

[0060] Through the control program, the servo motor 211 obtains the corresponding command and starts to provide power;

[0061] The power transmission mechanism 212 receives power from the servo motor 211 and starts to operate.

[0062] S43, motion control of the positioning cylinder 213: according to the control program output by the smelting operation cabinet 9:

[0063] The power transmission mechanism 212 transmits power to the positioning cylinder 213 to start the lateral telescopic movement;

[0064] The telescopic movement of the positioning cylinder 213 is carried out at a set speed and amplitude to ensure smooth and controllable movement.

[0065] S44, the tilting action of the rotating arm 22: Since one end of the rotating arm 22 is connected to the outer wall of the suspension crucible 1, when the positioning cylinder 213 completes the lateral extension and contraction, the rotating arm 22 moves accordingly, driving the suspension crucible 1 to achieve the tilting action; through program control, the tilting angle can be set, usually between 0° and 90°, depending on the flow requirements of the molten metal.

[0066] S45, precise control of tilting angle and speed: the smelting operation cabinet 9 makes dynamic adjustments based on real-time monitoring feedback:

[0067] If you need to change the tilting angle or speed, you can directly enter the new parameters through the control panel, and the program will update the control instructions in real time;

[0068] The precise design of the servo motor 211 and related mechanical components ensures the smoothness of the tipping process and avoids the splashing and waste of molten metal.

[0069] S46, complete tipping and resetting: Once the tipping operation is completed, the control program will:

[0070] Stop the power supply of the servo motor 211 to ensure that the rotating arm 22 and the suspension crucible 1 are in a safe and stable position;

[0071] By activating the reset procedure, the positioning cylinder 213 and the telescopic arm 21 will return to their initial positions, ready for the next operation.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stabilization system for a molten metal pool, characterized in that: include: A suspension crucible (1) for containing molten metal; An electric push rod (2) is arranged above the suspension crucible (1), the electric push rod (2) comprising a telescopic arm (21) and a rotating arm (22), one end of the telescopic arm (21) can be laterally telescoped, the other end of the telescopic arm (21) is connected to the rotating arm (22) via a rotating shaft, and the rotating arm (22) is connected to the outer side wall of the suspension crucible (1); a guide groove (3), wherein the groove opening of the guide groove (3) is arranged below the suspension crucible (1), the guide groove (3) comprises a casting pipe (31) and a baffle (32), the lower end of the casting pipe (31) is located above the molten metal pool, and the two sides of the baffle (32) and the groove wall of the guide groove (3) form a flow hole for the molten metal to pass through; and, An induction coil (4), wherein the induction coil (4) is arranged around the outer side wall of the guide groove (3).

2. The metal liquid pool stabilization system according to claim 1, characterized in that: The metal liquid pool stabilization system also includes: A first infrared thermometer (5) is used to monitor the temperature of the poured metal melt in real time; A second infrared thermometer (6) is used to monitor the temperature of the guide groove (3) in real time; a smelting power supply cabinet (7), used for heating the suspension crucible (1); and An induction heating power source (8) preheats the guide groove (3) through the induction coil (4).

3. The metal liquid pool stabilization system according to claim 2, characterized in that: The molten metal pool stabilization system also includes a smelting operation cabinet (9), and the smelting operation cabinet (9) remotely controls the smelting power supply cabinet (7) and the induction heating power supply (8).

4. The metal liquid pool stabilization system according to claim 3, characterized in that: The smelting operation cabinet (9) outputs a control program to the electric push rod (2), and the rotating arm (22) of the electric push rod (2) pushes the suspension crucible (1).

5. The metal liquid pool stabilization system according to claim 1, characterized in that: The groove wall of the guide groove (3) is cylindrical, and the upper plane of the cylinder is an inclined surface.

6. The metal liquid pool stabilization system according to claim 1, characterized in that: The groove bottom of the guide groove (3) is disc-shaped, the groove bottom side wall of the guide groove (3) is provided with an internal thread, and the groove wall of the guide groove (3) is provided with an external thread corresponding to the internal thread.

7. The metal liquid pool stabilization system according to claim 1, characterized in that: Grooves are provided on both sides of the baffle plate (32) in the length direction, and a groove bottom of the guide groove (3) is provided with a groove engaged with the groove.

8. The metal liquid pool stabilization system according to claim 1, characterized in that: The inner upper surface of the groove bottom of the guide groove (3) is provided with a certain slope, and a stepped hole is provided near the lower edge of the slope.

9. The metal liquid pool stabilization system according to claim 8, characterized in that: The casting tube (31) has an elongated tubular structure and a Y-shaped longitudinal cross section. A stepped ring matching the stepped hole is disposed on the outer side of the upper end of the casting tube (31).

10. A method for stabilizing a molten metal pool, characterized in that: The following steps are involved: S1, adding the metal material to be smelted into the suspension crucible (1), arranging the guide groove (3) at the pouring position, arranging the induction coil (4) on the periphery of the guide groove (3), and then closing the vacuum chamber, evacuating the vacuum chamber, and filling the chamber with argon gas; S2, starting the induction heating power supply (8), preheating the guide trough (3) through the induction coil (4), using the second infrared thermometer (6) to detect the temperature of the guide trough (3) in real time, when most of the bottom of the guide trough (3) is heated to the set temperature, the smelting operation cabinet (9) outputs the insulation program to stabilize the temperature of the guide trough (3); S3, start the smelting power cabinet (7), start smelting and detect the smelting temperature in real time through the first infrared thermometer (5), after reaching the casting temperature, start the constant temperature program, and the smelting operation cabinet (9) adjusts the output power at any time according to the data of the first infrared thermometer (5); S4. Automatic furnace turning operation is started, and the molten metal flows down evenly. The flow rate hits the high side wall of the guide groove (3), flows down along the side wall and is blocked by the baffle plate (32). The molten metal bypasses the flow holes on both sides and flows into the chamber where the casting pipe (31) is located. Since the inner hole of the casting pipe (31) is relatively thin, after passing through the second flow restriction of the casting pipe (31), the molten metal flows into the gap between the rollers (10) at the required flow rate and flow velocity.

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