Composite casting device and method for high-boron low-alloy high-speed steel roller

Abstract

The invention relates to the technical field of steel roller composite casting, in particular to a high-boron low-alloy high-speed steel roller composite casting device and method.The device comprises a base, a stabilizing plate is fixedly connected to the top of the base, an electric cabinet is arranged on the outer side of the stabilizing plate, and a composite casting mechanism is arranged at the top of the base; the composite casting mechanism comprises a casting mold, the top of the casting mold is fixedly connected with a feeding pipe, the cooling mechanism drives the first air outlet cover and the second air outlet cover to move on the outer side of the casting mold through transmission structures such as a bevel gear and a lead screw, and cold air provided by a refrigerating machine and an air pump is evenly blown to the mold through air outlet holes; according to the device, comprehensive and uniform cooling is achieved, defects such as internal stress and cracks are reduced, the product percent of pass is improved, the problem of uneven cooling caused by fixed cooling of an existing device is solved, all parts are in close fit, an automatic whole is formed, and then the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of composite casting technology for steel rolls, specifically to a composite casting apparatus and method for high-boron low-alloy high-speed steel rolls. Background Technology

[0002] In the fields of iron and steel metallurgy and metal processing, rolling mill rolls are key components of rolling equipment. Their performance directly affects the quality of rolled products, production efficiency and service life of equipment. High boron low alloy high speed steel has become an ideal material for manufacturing high-performance rolling mill rolls due to its excellent wear resistance, red hardness and toughness. Existing equipment typically includes basic components such as a base, casting mold, raw material handling mechanism, and cooling mechanism. The base serves as a supporting foundation, bearing the weight of each component and ensuring overall stability. The casting mold is the core area for roll forming, and its shape and size are determined according to the roll specifications. The raw material handling mechanism is mainly responsible for heating and melting high-boron low-alloy high-speed steel raw materials. The cooling mechanism is used to cool down the mold and the internal raw materials after casting. Existing cooling mechanisms mostly employ fixed-position cooling methods, where cooling components cannot be moved and can only cool localized areas of the casting mold. This method results in significant differences in cooling rates across different parts of the mold, which can easily lead to internal stress within the rolls, causing defects such as cracks and deformation. This significantly reduces product yield, increases production costs, and also affects production schedules. Furthermore, existing cooling devices cannot be integrated with the overall equipment; their independent operation requires an additional power source, resulting in energy waste and contradicting the current integrated design concept for equipment.

[0003] Therefore, a composite casting device and method for high-boron low-alloy high-speed steel rolls are proposed to address the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a composite casting apparatus and method for high boron low alloy high-speed steel rolls to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A composite casting device for high boron low alloy high-speed steel rolls includes a base, a stabilizing plate fixedly connected to the top of the base, an electrical control box disposed on the outside of the stabilizing plate, a composite casting mechanism disposed on the top of the base, the composite casting mechanism including a casting mold, a feed pipe fixedly connected to the top of the casting mold, a hot melt box fixedly connected to the outside of the stabilizing plate, a stirring mechanism disposed inside the hot melt box, and a cooling mechanism disposed on the outside of the casting mold. The stirring mechanism includes a motor, the output end of which is fixedly connected to a rotating shaft, and a stirring blade is fixedly connected to the outside of the rotating shaft; The cooling mechanism includes a first bevel gear, with a second bevel gear meshing with its outer side. A rotating rod is fixedly connected to the outer side of the shaft end of the second bevel gear. A lead screw is fixedly connected to the end of the rotating rod away from the second bevel gear. A rotating plate is fixedly connected to the outer side of the hot melt box. A collar is threadedly connected to the outer side of the lead screw. A limit rod is fixedly connected to the outer side of the collar. A moving groove is formed in the inner wall of the rotating plate. A connecting rod is fixedly connected to the end of the collar away from the limit rod. A first vent hood is fixedly connected to the bottom of the connecting rod. A retaining ring is fixedly connected to the bottom of the first vent hood. A conduit is retaining itself inside the retaining ring. A second vent hood is fixedly connected to the end of the conduit away from the retaining ring. As a further optimization of this utility model, the base is fixedly connected to a support plate, and the support plates are symmetrically distributed on the top of the base. The casting mold is fixedly connected to the top of the two support plates.

[0006] As a further optimization of this utility model, the top of the hot melt box is fixedly connected to a feed hopper, the outside of the hot melt box is fixedly connected to an extraction pump, and the output end of the extraction pump is located inside the feed pipe, while the feed end of the extraction pump is located inside the lower part of the hot melt box.

[0007] As a further optimization of this utility model, the hot melt box is fixedly connected to a fixing plate on its outer side, the motor is fixedly connected to the bottom of the fixing plate, the rotating shaft is rotatably connected to the inside of the hot melt box, and the stirring blades are evenly distributed on the outer side of the rotating shaft.

[0008] As a further optimization of this utility model, the first bevel gear is fixedly connected to the outside of the rotating shaft and is located on the outside of the hot melt box. The rotating rod passes through the inside of the operating plate, and the lead screw is rotatably connected to the outside of the operating plate through the rotating rod.

[0009] As a further optimization of this utility model, the snap ring and the guide tube are symmetrically distributed on the bottom outer side of the first vent hood, and the second vent hood is symmetrically connected to the first vent hood and movably connected to the outside of the casting mold.

[0010] As a further optimization of this utility model, the interiors of the No. 2 vent hood and the No. 1 vent hood are hollowed out, and air vents are provided in the inner walls of the No. 2 vent hood and the No. 1 vent hood.

[0011] As a further optimization of this utility model, a refrigeration unit is fixedly connected to the outer side of the operating plate, an air pump is fixedly connected to the bottom of the refrigeration unit, and an air pipe is fixedly connected to the bottom of the air pump.

[0012] As a further optimization of this utility model, the following features are provided: the refrigeration unit, the motor, and the electrical control box are electrically connected; the end of the vent pipe away from the air pump is fixedly connected to the inside of the No. 1 vent hood; the end of the limiting rod away from the collar is slidably connected to the inside of the moving groove; and the No. 1 vent hood is movably connected to the outside of the casting mold via a connecting rod.

[0013] A composite casting apparatus and method for high-boron low-alloy high-speed steel rolls: S1: Raw material preparation and hot melting: High boron low alloy high speed steel raw material is fed into the hot melting box through the feeding hopper. The hot melting box is started through the electrical control box to heat and melt the raw material. At the same time, the motor is started, and the motor drives the rotating shaft to rotate. The stirring blades on the outside of the rotating shaft stir the molten raw material to make the raw material evenly mixed. S2: Raw materials are injected into the casting mold. When the raw materials in the hot melt box reach the preset casting temperature and are mixed evenly, the extraction pump is started through the electrical control box. The extraction pump extracts the molten raw materials in the hot melt box and transports them to the casting mold through the feed pipe. S3: Casting mold cooling. During the process of raw material injection into the casting mold, the refrigeration unit and air pump are started through the electrical control box. The refrigeration unit generates cold air, and the air pump delivers the cold air to the No. 1 and No. 2 air hoods through the ventilation pipes, and then blows it onto the casting mold through the air outlets. At the same time, the rotating shaft drives the No. 1 bevel gear to rotate, the No. 1 bevel gear drives the No. 2 bevel gear to rotate, the No. 2 bevel gear drives the rotating rod to rotate, the rotating rod drives the lead screw to rotate, and the rotation of the lead screw causes the collar to move along the moving groove on the operating plate through the limit rod. The collar drives the No. 1 and No. 2 air hoods to move outside the casting mold through the connecting rod, so as to achieve uniform cooling of the casting mold. S4: Roll forming and removal. After the raw material in the casting mold has cooled and formed, stop the refrigeration unit, air pump and motor, open the casting mold and remove the formed high boron low alloy high speed steel roll.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (i) In this invention, in terms of raw material mixing, the uniformly distributed stirring blades in the stirring mechanism fully stir the molten raw materials in the hot melt box under the drive of the motor, which solves the problem of simple stirring and insufficient mixing in the existing device, ensures uniform raw material composition and improves the mechanical properties of the roll.

[0015] (ii) In this invention, the cooling mechanism drives the No. 1 and No. 2 air vents to move outside the casting mold through a transmission structure such as bevel gears and lead screws. Combined with the cold air provided by the refrigeration unit and air pump, the cold air is blown evenly onto the mold through the air vents to achieve comprehensive and uniform cooling, reduce internal stress and cracks and other defects, improve the product qualification rate, and overcome the problem of uneven cooling caused by the fixed cooling of existing devices.

[0016] (III) In this invention, the support plate provides stable support for the casting mold, the snap ring and the guide tube work together to enable the No. 2 vent hood and the No. 1 vent hood to work together, the limiting rod and the moving groove ensure the stable movement of the collar, the overall structure is compact and reasonable, the components have strong synergy, which improves the stability and efficiency of the device operation and solves the problem of poor component synergy in the existing device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure from one side of the present invention; Figure 3 This is a schematic diagram of the internal structure of the casting mold of the present invention; Figure 4 This is a schematic diagram of the outer structure of the casting mold of the present invention; Figure 5 This is a schematic diagram of the internal structure of the hot melt box of the present invention; Figure 6 This is a schematic diagram of the outer structure of the cooling mechanism of the present invention; Figure 7 This is a schematic diagram of the structure between the refrigeration unit and the No. 1 exhaust hood of the present invention; Figure 8 This is a schematic diagram of the outer structure of the stirring mechanism of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of the structure at point A in the middle; Figure 10 For the present invention Figure 6 Enlarged view of the structure at point B.

[0018] In the diagram: 1. Base; 2. Stabilizing plate; 3. Electrical control box; 4. Composite casting mechanism; 41. Support plate; 42. Casting mold; 43. Feed pipe; 44. Hot melt box; 45. Feed hopper; 46. Extraction pump; 5. Stirring mechanism; 51. Fixing plate; 52. Motor; 53. Rotating shaft; 54. Stirring blade; 6. Cooling mechanism; 61. First bevel gear; 62. Second bevel gear; 63. Rotating rod; 64. Lead screw; 65. Operating plate; 66. Collar; 67. Limiting rod; 68. Moving groove; 69. Connecting rod; 610. First vent hood; 611. Vent hole; 612. Snap-fit ​​ring; 613. Conduit; 614. Second vent hood; 615. Refrigeration unit; 616. Air pump; 617. Vent pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Please see Figures 1-10 The present invention provides a technical solution: A composite casting device and method for high boron low alloy high-speed steel rolls includes a base 1, a stabilizing plate 2 fixedly connected to the top of the base 1, an electrical control box 3 arranged on the outside of the stabilizing plate 2, a composite casting mechanism 4 arranged on the top of the base 1, the composite casting mechanism 4 including a casting mold 42, a feed pipe 43 fixedly connected to the top of the casting mold 42, a hot melt box 44 fixedly connected to the outside of the stabilizing plate 2, a stirring mechanism 5 arranged inside the hot melt box 44, and a cooling mechanism 6 arranged on the outside of the casting mold 42. The stirring mechanism 5 includes a motor 52, the output end of which is fixedly connected to a rotating shaft 53, and the outer side of the rotating shaft 53 is fixedly connected to a stirring blade 54. The cooling mechanism 6 includes a first bevel gear 61, a second bevel gear 62 meshing with the outer side of the first bevel gear 61, a rotating rod 63 fixedly connected to the outer side of the shaft end of the second bevel gear 62, a lead screw 64 fixedly connected to the end of the rotating rod 63 away from the second bevel gear 62, a rotating plate 65 fixedly connected to the outer side of the hot melt box 44, a collar 66 threadedly connected to the outer side of the lead screw 64, a limit rod 67 fixedly connected to the outer side of the collar 66, a moving groove 68 opened in the inner wall of the rotating plate 65, a connecting rod 69 fixedly connected to the end of the collar 66 away from the limit rod 67, a first vent 610 fixedly connected to the bottom of the connecting rod 69, a snap ring 612 fixedly connected to the bottom of the first vent 610, a conduit 613 snapped into the inside of the snap ring 612, and a second vent 614 fixedly connected to the end of the conduit 613 away from the snap ring 612.

[0022] It should be noted that: a support plate 41 is fixedly connected to the top of the base 1, and the support plates 41 are symmetrically distributed on the top of the base 1; the casting mold 42 is fixedly connected to the top of the two support plates 41; a feed hopper 45 is fixedly connected to the top of the hot melt box 44; a suction pump 46 is fixedly connected to the outside of the hot melt box 44, and the output end of the suction pump 46 is located inside the feed pipe 43; the feed end of the suction pump 46 is located inside the lower part of the hot melt box 44; a fixing plate 51 is fixedly connected to the outside of the hot melt box 44; a motor 52 is fixedly connected to the bottom of the fixing plate 51; a rotating shaft 53 is rotatably connected to the inside of the hot melt box 44; and stirring blades 54 are evenly distributed on the outside of the rotating shaft 53.

[0023] Furthermore: the first bevel gear 61 is fixedly connected to the outside of the rotating shaft 53, and the first bevel gear 61 is located outside the hot melt box 44. The rotating rod 63 passes through the inside of the operating plate 65. The lead screw 64 is rotatably connected to the outside of the operating plate 65 through the rotating rod 63. The snap ring 612 and the guide tube 613 are symmetrically distributed on the bottom outside of the first vent 610. The second vent 614 is symmetrically connected to the first vent 610 and movably connected to the outside of the casting mold 42. The first bevel gear 61 and the rotating shaft 53 are fixed by a key connection and reinforced with set screws to ensure synchronous rotation. The tooth surfaces of the first bevel gear 61 and the second bevel gear 62 are treated with high frequency quenching to improve wear resistance and transmission accuracy. The meshing gap between the two is precisely adjusted to reduce noise and energy loss during transmission. The part of the rotating rod 63 that passes through the operating plate 65 is equipped with a bearing. The fit clearance between the bearing and the operating plate 65 is extremely small, which ensures the flexible rotation of the rotating rod 63 and can withstand a certain radial force. The lead screw 64 and the rotating rod 63 are integrally formed. The lead screw 64 has high thread precision and fits tightly with the internal thread of the collar 66, ensuring that the collar 66 will not jam during movement.

[0024] Specifically: the interiors of the second vent 614 and the first vent 610 are hollow, and vent holes 611 are opened in the inner walls of the second vent 614 and the first vent 610. A refrigeration unit 615 is fixedly connected to the outer side of the operating plate 65, and an air pump 616 is fixedly connected to the bottom of the refrigeration unit 615. A vent pipe 617 is fixedly connected to the bottom of the air pump 616. The limiting rod 67 fixed to the outer side of the collar 66 forms a moving groove 68 on the inner wall of the operating plate 65. The sliding fit is achieved by installing a wear-resistant slider at the end of the limiting rod 67. Lubricant is applied to the contact surface between the slider and the moving groove 68 to reduce sliding friction. The connection between the connecting rod 69 and the collar 66, as well as the first vent 610, uses detachable bolts for easy maintenance and replacement. An elastic rubber pad is installed inside the snap ring 612 at the bottom of the first vent 610, ensuring a tight seal and facilitating the installation and removal of the conduit 613. The symmetrical design of the second vent 614 and the first vent 610 allows for simultaneous cooling from both sides of the casting mold 42, improving cooling efficiency. The vent holes 611 on the inner walls of both vents are arranged in a matrix with consistent diameter, ensuring that cold air is evenly distributed across the surface of the casting mold 42.

[0025] Meanwhile, the casting mold 42 is made of special steel with high temperature resistance and excellent thermal conductivity. Its internal cavity is precisely machined according to the shape of a high-boron low-alloy high-speed steel roll, and the cavity surface is polished to reduce resistance during the raw material forming process and ensure a smooth roll surface. The top feed pipe 43 is connected to the casting mold 42 by welding, and the interface is sealed to prevent leakage of molten raw materials. The outer shell of the hot melt box 44 adopts a double-layer insulation structure, with the inner layer being high-temperature resistant stainless steel and the outer layer filled with heat insulation material, which can effectively reduce heat loss, reduce energy consumption, and prevent operators from being burned by contact with the box.

[0026] Furthermore, the fixing plate 51 fixed to the outside of the hot melt box 44 is tightly connected to the box body by bolts. The motor 52 fixed at its bottom is a servo motor with good speed regulation performance, which can adjust the speed according to the melting state of the raw materials. The connection between the output end of the motor 52 and the rotating shaft 53 adopts a coupling structure, which can effectively buffer the torque during rotation and protect the motor 52 and the rotating shaft 53. The rotating shaft 53 is made of solid alloy steel, which has high strength and wear resistance. The stirring blades 54 evenly distributed on its outer side are arranged in a spiral shape. The edges of the blades are passivated, which not only ensures the stirring effect, but also avoids scratching the inner wall of the hot melt box 44. The welding of the stirring blades 54 and the rotating shaft 53 adopts argon arc welding process to ensure a firm connection and prevent them from falling off during high-speed stirring.

[0027] As a further implementation of this scheme, the refrigeration unit 615, the motor 52 and the electrical control box 3 are electrically connected. The end of the vent pipe 617 away from the air pump 616 is fixedly connected to the inside of the first vent 610. The end of the limiting rod 67 away from the collar 66 is slidably connected to the inside of the moving groove 68. The first vent 610 is movably connected to the outside of the casting mold 42 through the connecting rod 69.

[0028] However, the refrigerator 615 and air pump 616, which are fixed to the outside of the operating plate 65, are connected to the operating plate 65 through a bracket. The height of the bracket is adjusted so that the refrigerator 615 and air pump 616 are in a horizontal position to ensure their normal operation. The vent pipe 617 is made of flexible and high-temperature resistant hose. Its connection with the air pump 616 and the first air outlet hood 610 is fixed with clamps, which facilitates disassembly and maintenance. The outer shell of the electrical control box 3 is designed to be waterproof and dustproof. The internal circuit layout is reasonable, and there is enough heat dissipation space between each electrical component to ensure that the electrical control box 3 can stably and reliably control the operation of each component.

[0029] Work process: The operator puts the high boron low alloy high speed steel raw material into the hot melt box 44 through the feed hopper 45 at the top of the hot melt box 44. Then, the operator starts the hot melt box 44 through the electrical control box 3 on the outside of the stabilizing plate 2 to heat the raw material inside until the raw material reaches a molten state. At the same time, the electrical control box 3 controls the motor 52 at the bottom of the fixed plate 51 to start. The output end of the motor 52 drives the rotating shaft 53 to rotate inside the hot melt box 44. The stirring blades 54 evenly distributed on the outside of the rotating shaft 53 rotate together with the rotating shaft 53 to fully stir the molten raw material and ensure that the components in the raw material are mixed evenly, laying the foundation for the subsequent casting of rolls with stable performance. Next, the raw material injection casting stage begins. When the molten raw material in the hot melt box 44 is mixed evenly and reaches the preset casting temperature, the electrical control box 3 starts the extraction pump 46 on the outside of the hot melt box 44. The feed end of the extraction pump 46 is located inside the lower part of the hot melt box 44, which can smoothly extract the molten raw material and then transport it to the feed pipe 43 on the top of the casting mold 42 through its output end, so that the molten raw material enters the casting mold 42. The casting mold 42 is fixedly supported by the support plates 41 symmetrically distributed on the top of the base 1, which ensures the stability of the mold during the raw material injection process. While the raw material is being injected into the casting mold 42, the cooling mechanism 6 starts working. The electrical control box 3 starts the refrigerator 615 and air pump 616 on the outside of the operating plate 65. The refrigerator 615 generates cold air, and the air pump 616 delivers the cold air to the inside of the first air outlet 610 through the bottom vent pipe 617. Since the first air outlet 610 is connected to the second air outlet 614 through the snap ring 612 and the conduit 613, and both of them are hollow inside, the cold air will enter the second air outlet 614 at the same time, and then blow it onto the casting mold 42 through the air outlet holes 611 opened on the inner wall of both to cool the mold. Meanwhile, the rotation of the rotating shaft 53 in the stirring mechanism 5 will also drive the first bevel gear 61 located outside the hot melt box 44 to rotate. The first bevel gear 61 meshes with the second bevel gear 62, thereby driving the second bevel gear 62 to rotate. The rotating rod 63 on the outer side of the shaft end of the second bevel gear 62 will rotate accordingly. The rotating rod 63 passes through the interior of the operating plate 65, thereby driving the lead screw 64 at its other end to rotate outside the operating plate 65. Under the rotation of the lead screw 64, the collar 66 threaded on the outer side of the lead screw 64 slides along the moving groove 68 on the inner wall of the operating plate 65 through the limiting rod 67 fixedly connected on the outer side, realizing the stable movement of the collar 66. The end of the collar 66 away from the limiting rod 67 drives the first air hood 610 and the second air hood 614 to move outside the casting mold 42 through the connecting rod 69, so that the cold air blown out of the air vent 611 can evenly cover the surface of the casting mold 42, realizing uniform cooling. After the raw material in the casting mold 42 cools and solidifies, the electrical control box 3 shuts down the refrigeration unit 615, the air pump 616 and the motor 52. The operator can then open the casting mold 42 and remove the solidified high-boron low-alloy high-speed steel roll. The entire process is controlled centrally by the electrical control box 3, which realizes the automated and coordinated operation of raw material hot melting and stirring, injection into the mold and cooling and shaping, ensuring the high efficiency and high quality of roll casting.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compound casting device of high-boron low-alloy high-speed steel roller, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected with a stable plate (2), the outer side of the stable plate (2) is provided with an electric control box (3), the top of the base (1) is provided with a composite casting mechanism (4), the composite casting mechanism (4) comprises a casting mold (42), the top of the casting mold (42) is fixedly connected with a feeding pipe (43), the outer side of the stable plate (2) is fixedly connected with a hot melting box (44), the inside of the hot melting box (44) is provided with a stirring mechanism (5), and the outer side of the casting mold (42) is provided with a cooling mechanism (6). The stirring mechanism (5) comprises a motor (52), the output end of the motor (52) is fixedly connected with a rotating shaft (53), and the outer side of the rotating shaft (53) is fixedly connected with a stirring blade (54). The cooling mechanism (6) comprises a No. 1 bevel gear (61), the outer side of the No. 1 bevel gear (61) is engaged with a No. 2 bevel gear (62), the outer side of the shaft center end of the No. 2 bevel gear (62) is fixedly connected with a rotating rod (63), one end of the rotating rod (63) away from the No. 2 bevel gear (62) is fixedly connected with a lead screw (64), the outer side of the hot melting box (44) is fixedly connected with a rotating plate (65), the outer side of the lead screw (64) is threadedly connected with a sleeve ring (66), the outer side of the sleeve ring (66) is fixedly connected with a limiting rod (67), the inner wall of the rotating plate (65) is provided with a moving groove (68), one end of the sleeve ring (66) away from the limiting rod (67) is fixedly connected with a connecting rod (69), the bottom of the connecting rod (69) is fixedly connected with a No. 1 air outlet cover (610), the bottom of the No. 1 air outlet cover (610) is fixedly connected with a clamping ring (612), the inside of the clamping ring (612) is clamped with a conduit (613), and one end of the conduit (613) away from the clamping ring (612) is fixedly connected with a No. 2 air outlet cover (614).

2. The compound casting device of high-boron low-alloy high-speed steel roller according to claim 1, characterized in that: The top of the base (1) is fixedly connected with a support plate (41), and the support plates (41) are symmetrically distributed on the top of the base (1), and the casting mold (42) is fixedly connected on the top of the two support plates (41).

3. The compound casting device of high-boron low-alloy high-speed steel roller according to claim 1, characterized in that: The top of the hot melting box (44) is fixedly connected with a feeding hopper (45), the outer side of the hot melting box (44) is fixedly connected with a suction pump (46), and the output end of the suction pump (46) is located in the inside of the feeding pipe (43), and the feeding end of the suction pump (46) is located below the inside of the hot melting box (44).

4. The compound casting device of high-boron low-alloy high-speed steel roller according to claim 1, characterized in that: The outer side of the hot melting box (44) is fixedly connected with a fixed plate (51), the motor (52) is fixedly connected on the bottom of the fixed plate (51), the rotating shaft (53) is rotatably connected in the inside of the hot melting box (44), and the stirring blades (54) are uniformly distributed on the outer side of the rotating shaft (53).

5. The compound casting device of high-boron low-alloy high-speed steel roller according to claim 1, characterized in that: The No. 1 bevel gear (61) is fixedly connected on the outer side of the rotating shaft (53), and the No. 1 bevel gear (61) is located on the outer side of the hot melting box (44), the rotating rod (63) penetrates through the inside of the rotating plate (65), and the lead screw (64) is rotatably connected on the outer side of the rotating plate (65) through the rotating rod (63).

6. The compound casting device of high-boron low-alloy high-speed steel roller according to claim 1, characterized in that: The clamping ring (612) is symmetrically distributed with the catheter (613) on the bottom of the first gas cover (610), the second gas cover (614) is symmetrically and movably connected with the first gas cover (610) on the outside of the casting mold (42).

7. The compound casting device of high boron low alloy high speed steel roller according to claim 1, characterized in that: The second gas cover (614) and the first gas cover (610) are hollow inside, and the second gas cover (614) and the first gas cover (610) are provided with gas outlets (611) in the inner wall.

8. The compound casting device of high boron low alloy high speed steel roller according to claim 1, characterized in that: The outer side of the running plate (65) is fixedly connected with a refrigerating machine (615), the bottom of the refrigerating machine (615) is fixedly connected with an air pump (616), and the bottom of the air pump (616) is fixedly connected with an air pipe (617).

9. The compound casting device of high boron low alloy high speed steel roller according to claim 1, characterized in that: The refrigerating machine (615), the motor (52) and the electric control box (3) are electrically connected, one end of the air pipe (617) away from the air pump (616) is fixedly connected in the first gas cover (610), one end of the limiting rod (67) away from the sleeve ring (66) is slidably connected in the moving groove (68), and the first gas cover (610) is movably connected with the connecting rod (69) on the outside of the casting mold (42).

10. The high-boron low-alloy high-speed steel roller composite casting device and method according to any one of claims 1-9, characterized in that: S1: raw material preparation and hot melting, the high-boron low-alloy high-speed steel raw material is put into the hot melting box (44) through the feeding hopper (45), the raw material is heated and melted by starting the hot melting box (44) through the electric control box (3), and the motor (52) is started, the motor (52) drives the rotating shaft (53) to rotate, the stirring blade (54) on the outer side of the rotating shaft (53) stirs the molten raw material, and the raw material is uniformly mixed; S2: raw material injection into casting mold, when the raw material in the hot melting box (44) reaches the preset casting temperature and is uniformly mixed, the extraction pump (46) is started through the electric control box (3), the molten raw material in the hot melting box (44) is extracted and delivered into the casting mold (42) through the feeding pipe (43); S3: cooling of the casting mold, in the process of injecting the raw material into the casting mold (42), the refrigerating machine (615) and the air pump (616) are started through the electric control box (3), the refrigerating machine (615) generates cold air, the air pump (616) delivers the cold air to the first gas cover (610) and the second gas cover (614) through the air pipe (617), and then blows the cold air to the casting mold (42) through the gas outlet (611); at the same time, the rotating shaft (53) drives the first bevel gear (61) to rotate, the first bevel gear (61) drives the second bevel gear (62) to rotate, the second bevel gear (62) drives the rotating rod (63) to rotate, the rotating rod (63) drives the lead screw (64) to rotate, the lead screw (64) rotates to make the sleeve ring (66) move on the running plate (65) through the limiting rod (67) along the moving groove (68), the sleeve ring (66) drives the first gas cover (610) and the second gas cover (614) to move outside the casting mold (42) through the connecting rod (69), and the casting mold (42) is uniformly cooled. S4: roller forming and taking out, after the raw material in the casting mold (42) is cooled and formed, stop the refrigerator (615), the air pump (616) and the motor (52), open the casting mold (42), and take out the formed high-boron low-alloy high-speed steel roller.

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