A method of repairing a centrifugal casting hot die

Abstract

A kind of repair method of centrifugal casting hot die, comprising the following steps: S1, the damaged area of pipe mould is removed using milling head, forming the standard pit to be repaired;S2, the standard pit formed in step S1 is repaired three-dimensionally using laser cladding head;S3, repeat step S1 and step S2 until all areas of pipe mould are repaired;S4, replace milling head with grinding head, polish the surface of all repaired areas to make the surface smooth;S5, stress relief annealing is carried out on the repaired part of pipe mould.The repair method uses mechanization to remove the damaged area of pipe mould to form standard pit, then fills the standard pit using laser cladding method and polishes it to be smooth, which can not only repair internal cracks of pipe mould, but also repair external damage of pipe mould, and further cooperate with professional heat treatment equipment to carry out stress relief annealing after laser three-dimensional repair, with high production efficiency, and standardized operation also improves the quality of repair.

Description

Technical Field

[0001] This invention relates to the field of mold repair technology, and specifically to a method for repairing a hot mold used in centrifugal casting. Background Technology

[0002] Centrifugal cast pipe, also known as centrifugal cast steel pipe, is produced using the centrifugal casting method. This method is not only highly efficient but also produces pipes with a dense microstructure. The hot mold used for centrifugal casting refers to the pipe mold used in the hot mold method for centrifugal casting of steel pipes (hereinafter referred to as "mold"). After prolonged use, shallow or deep cracks may appear inside the mold due to thermal stress, and the outside may also be damaged by various external impacts. However, considering cost and other economic factors, localized damage is usually not enough to render the entire mold unusable. Therefore, the damaged areas of the mold need to be repaired before continued use.

[0003] In existing technologies, the damaged area is often removed manually by grinding, and then filled with filler material by welding before being ground smooth and flat. This repair method is labor-intensive, difficult to operate due to space limitations, and has extremely low repair efficiency. At the same time, the repair quality is not easy to guarantee. There is a need to develop a mechanized method for repairing pipe molds that is both efficient and of high quality. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for repairing hot molds used in centrifugal casting. This method employs a mechanized approach to first remove damaged areas of the mold to form standard pits, then fills the standard pits using laser cladding, and finally polishes them smooth. This method can repair not only internal cracks in the mold but also external damage, resulting in high production efficiency. Furthermore, standardized operations improve the quality of the repair.

[0005] The technical solution of the present invention is as follows:

[0006] A method for repairing a hot mold used in centrifugal casting includes the following steps:

[0007] S1, Use a milling head to remove the damaged area of ​​the tube mold to form a standard pit to be repaired;

[0008] S2, using a laser cladding head to 3D repair the standard pit formed in step S1;

[0009] S3. Repeat steps S1 and S2 until all damage to the mold area is repaired.

[0010] S4. Replace the milling head with a grinding head and grind all the repaired areas to make the surface smooth and flat.

[0011] S5, stress-relief annealing is performed on the repaired parts of the tube mold.

[0012] The repair method for the hot mold used in centrifugal casting as described above, wherein step S1 includes:

[0013] S1-1, The tube mold is rotatably placed on the support seat of the clamping and rotating device;

[0014] S1-2, after the two half clamping wheels are fitted onto the outer periphery of the tube mold, they are fastened together, and the combined clamping wheels and the tube mold are tightly fitted.

[0015] S1-3, Place the drive belt onto the clamping wheel and the drive wheel;

[0016] S1-4, Start the rotating motor to drive the tube mold to rotate and adjust its position;

[0017] S1-5, Adjust the height of the milling head with the rod height adjustment device so that the milling head does not interfere with the mold when it is inserted into the mold or the outer peripheral area;

[0018] S1-6, Adjust the length of the adjusting rod so that the milling head moves to the area to be repaired;

[0019] S1-7, The height of the milling head is gradually adjusted by the rod height adjustment device so that the milling head gradually contacts the tube mold to remove the material from the area to be repaired. During this process, the material removal range is adjusted by rotating the tube mold.

[0020] S1-8, After completing the above steps, move the milling head outside the mold.

[0021] The repair method for the hot mold used in centrifugal casting as described above, step S2 includes:

[0022] S2-1, Adjust the height of the laser cladding head using the mounting height adjustment device so that the laser cladding head and connecting rod do not interfere with the mold when they are inserted into the mold or its outer periphery.

[0023] S2-2, Start the sliding motor and move the laser cladding head to the standard pit formed in S1;

[0024] S2-3, Start the laser cladding host and fill the standard pits using a three-dimensional deposition method. During this process, the deposition path and filling range are adjusted by rotating the mold. After filling is complete, turn off the laser cladding host.

[0025] S2-4 After the above steps are completed, move the laser cladding head outside the mold.

[0026] In the repair method for the hot mold used in centrifugal casting as described above, step S4 includes:

[0027] S4-1, Remove the milling head from the end of the rod height adjustment device and install the grinding head;

[0028] S4-2, Adjust the height of the grinding head using the rod height adjustment device so that the grinding head does not interfere with the mold when it is inserted into the mold or the outer peripheral area;

[0029] S4-3, Adjust the length of the adjusting rod so that the grinding head moves to the area to be ground;

[0030] S4-4, Use the rod height adjustment device to gradually adjust the height of the grinding head so that the grinding head gradually contacts the mold and grinds the area to be ground smooth and flat. During this process, the grinding position and grinding range are adjusted by rotating the mold.

[0031] S4-5, After completing the above steps, move the grinding head outside the mold.

[0032] In the repair method of the hot mold for centrifugal casting described above, step S5 involves placing the mold in an annealing furnace for stress-relief annealing, or using a local heat treatment device to locally anneal the mold, depending on the number of parts to be repaired.

[0033] The repair method for centrifugal casting hot molds described above includes the following steps: local annealing of the mold using a local heat treatment device.

[0034] S5-1 After the tube mold is removed from the clamping and rotating device, it is hoisted to the heat treatment station and placed on the two side support frames of the local heat treatment equipment.

[0035] S5-2, the heating box is driven to move between the two support frames by the heating box drive assembly until the heating chamber of the heating box covers the part of the tube mold that needs to be locally annealed;

[0036] S5-3, Close and lock the upper and lower halves of the heating box to the part of the tube mold that needs local annealing, and perform heating, heat preservation and cooling according to the annealing process; S5-4, Move the heating box to another part of the tube mold that needs local annealing to perform the annealing process, or open the upper half of the heating box and lift out the annealed tube mold.

[0037] In the repair method of the hot mold for centrifugal casting described above, in step S1-1, a rotatable support roller is provided on the support base, and the tube mold is placed on the support roller.

[0038] In the repair method of the hot mold for centrifugal casting described above, in step S1-2, when the area to be repaired is the outer periphery of the mold, the position of the semi-clamping wheel on the outer periphery of the mold is adjusted to avoid the area to be repaired on the outer periphery of the mold.

[0039] As described above, in the method for repairing hot molds used for centrifugal casting, when there are more than three repair sites on the mold and their distribution reaches more than one-third of the mold length, or when the repair sites appear at the socket forming end of the mold, the mold should be placed in an annealing furnace for stress-relieving annealing; otherwise, a local heat treatment device should be used to locally anneal the mold.

[0040] In the repair method for the hot mold used in centrifugal casting described above, the height of the heating box can be adjusted within a certain range.

[0041] The beneficial effects of this invention are as follows:

[0042] This invention provides a repair method for hot molds used in centrifugal casting. The repair method uses a mechanized approach to first remove the damaged area of ​​the mold to form a standard pit, and then uses laser cladding to fill the standard pit and polish it smooth. This method can not only repair internal cracks in the mold, but also repair external damage. Furthermore, it can be combined with professional heat treatment equipment for stress-relieving annealing after laser three-dimensional repair. The method has high production efficiency, and the standardized operation also improves the quality of repair. Attached Figure Description

[0043] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] In the attached diagram:

[0045] Figure 1 This is a flowchart illustrating the repair method for a centrifugal casting hot mold according to the present invention.

[0046] Figure 2 A schematic diagram of the repair equipment used to perform the repair method of the present invention;

[0047] Figure 3 This is a schematic diagram of the structure of a laser cladding equipment;

[0048] Figure 4 for Figure 3 A partial view from center A;

[0049] Figure 5 This is a schematic diagram of the structure of the clamping and rotating device;

[0050] Figure 6 for Figure 5 The right-hand view;

[0051] Figure 7 This is a schematic diagram of the structure of milling and grinding equipment;

[0052] Figure 8 for Figure 7 Top view;

[0053] Figure 9 A schematic diagram of a local heat treatment device used to perform the repair method of the present invention;

[0054] Figure 10 for Figure 9 A schematic diagram of the heating box structure.

[0055] The components represented by the various reference numerals in the diagram are:

[0056] 1. Tube mold (hot mold for centrifugal casting);

[0057] 2. Equipment base; 201. Rail; 202. Rack;

[0058] 3. Laser cladding equipment, 301. Laser cladding head, 302. Connecting rod, 303. Laser cladding main unit, 304. Cladding main unit mounting base, 305. Mounting base height adjustment device, 306. Sliding base, 307. Sliding motor, 308. Gear;

[0059] 4. Clamping and rotating device, 401. Support base, 4011. Support roller, 402. Half clamping wheel, 403. Transmission belt, 404. Drive wheel, 405. Rotating motor;

[0060] 5. Milling and grinding equipment, 501. Milling head or grinding head, 502. Guide column, 5021. Slide groove, 503. Adjusting rod, 5031. Guide block, 504. Rod height adjustment device;

[0061] 6. Local heat treatment equipment; 61. Support frame; 62. Heating box; 621. Upper half of the chamber; 622. Lower half of the chamber; 623. Flange; 624. Insulation and adjustment pad; 63. Lock; 64. Heating box drive assembly; 65. Guide component. Detailed Implementation

[0062] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0063] Example 1

[0064] like Figure 1 As shown, the repair method for the hot mold used in centrifugal casting provided in this embodiment is implemented through a combination of additive and subtractive processing and stress-relieving annealing heat treatment, and more specifically includes the following steps:

[0065] S1, use a milling head to remove the damaged area of ​​the tube mold 1 to form a standard pit to be repaired.

[0066] S2, using a laser cladding head to 3D repair the standard pit formed in step S1.

[0067] S3. Repeat steps S1 and S2 until all damage in all areas of the mold 1 has been repaired.

[0068] S4. Replace the milling head with a grinding head to grind all the repaired areas to make the surface smooth and flat.

[0069] S5, stress-relief annealing is performed on the repaired parts of the tube mold 1.

[0070] like Figure 2 The diagram shows the structural structure of the equipment upon which the repair method for hot molds used in centrifugal casting is based. The equipment consists of three parts: a laser cladding device 3, a clamping and rotating device 4, and a milling and grinding device 5. All three devices are placed on the equipment base 2. The clamping and rotating device 4 is located in the middle and is used to clamp and rotate the mold 1. The milling and grinding device 5 is used to remove material from the part of the mold 1 to be repaired and to grind it smooth after cladding. The laser cladding device 3 is used to fill the standard pits in the part to be repaired.

[0071] like Figure 3 and Figure 4 As shown, the laser cladding equipment 3 includes a laser cladding head 301, a connecting rod 302, a laser cladding main unit 303, a cladding main unit mounting base 304, a mounting base height adjustment device 305, a sliding base 306, a sliding motor 307, and a gear 308. The laser cladding main unit 303 includes a laser and a powder feeder. The laser cladding head 301 is connected to the laser via the connecting rod 302. The connecting rod 302 contains an optical path channel and a powder feeding pipe. The optical path channel supplies laser light to the laser cladding area; one end of the optical path channel is located inside the laser cladding head 301, and the other end is connected to the output end of the laser. The powder feeding pipe supplies coating powder to the laser cladding area; the other end of the powder feeding pipe is also located inside the laser cladding head 301, and the other end is connected to the powder feeder in the laser cladding main unit 303. The laser cladding head 301 forms a certain angle with the surface of the mold 1, thus allowing the laser cladding head 301 to perform three-dimensional repair work on any position on the surface of the mold 1 using the principle of internal powder feeding.

[0072] The laser cladding host 303 is fixedly placed on the cladding host mounting base 304, which is mounted on the sliding base 306 via a mounting base height adjustment device 305. Specifically, the mounting base height adjustment device 305 can be a cylinder, a hydraulic cylinder, an electric push rod, or a servo electric cylinder. The sliding base 306 is slidably mounted on the equipment base 2. A track 201 is provided on the equipment base 2, and a groove matching the shape of the track 201 is provided below the sliding base 306. The sliding base 306 is driven to slide by a sliding motor 307, which is fixed on the sliding base 306. A gear 308 is connected to the output shaft of the sliding motor 307, and a rack 202 is provided on the equipment base 2. The sliding motor 307 drives the gear 308 to cooperate with the rack 202, and the groove cooperates with the track 201 to achieve linear left and right sliding of the sliding base 306 on the equipment base 2.

[0073] Furthermore, in order to improve the quality of laser cladding, a necessary inert gas channel is provided in the connecting rod 302. One end of the inert gas channel is connected to an external inert gas source, and the other end is located in the laser cladding head 301. The inert gas is sprayed into the laser cladding area through the laser cladding head 301 to prevent the additive coating from being oxidized during the laser cladding process.

[0074] like Figure 5 and Figure 6 As shown, the clamping and rotating device 4 includes a support base 401, half-clamping wheels 402, a transmission belt 403, a drive wheel 404, and a rotating motor 405. The support base 401 is fixedly placed on the device base 2. A semi-circular hole is provided on the upper part of the support base 401. At least three rotatable support rollers 4011 are evenly distributed in the semi-circular hole. The tube mold 1 is placed on the support rollers 4011 and can rotate. The two half-clamping wheels 402 are fastened with bolts to form a clamping wheel. The clamping wheel is fitted on the outer circumference of the tube mold 1 and is tightly fitted with it. The outer circle of the clamping wheel is connected to the drive wheel 404 through the transmission belt 403. The drive wheel 404 is connected to the output shaft of the rotating motor 405. As can be seen from the figure, the length of the drive wheel 404 is much longer than the length of the clamping wheel. This is done so that the clamping wheel has a certain amount of adjustment in the left and right directions, which is used to avoid damage to the outer circumference when clamping the tube mold 1.

[0075] like Figure 7 and Figure 8As shown, the milling and grinding equipment includes a milling head or grinding head 501, a guide post 502, an adjusting rod 503, and a rod height adjusting device 504. The milling head or grinding head 501 is detachably mounted on the end of the adjusting rod 503. A guide block 5031 is fixed on the rod body of the adjusting rod 503. The guide block 5031 cooperates with the slide groove 5021 provided on the guide post 502. The adjusting rod 503 is connected to the equipment base through the rod height adjusting device 504. The rod height adjusting device 504 can be a cylinder, a hydraulic cylinder, an electric push rod, or a servo electric cylinder. The guide post 502 is also fixed on the equipment base 2. The length of the adjusting rod 503 itself is adjustable. Preferably, the adjusting rod 503 is a servo electric cylinder, and the milling head or grinding head 501 is mounted on the cylinder head of the servo electric cylinder.

[0076] Based on the aforementioned equipment, in the repair method for the aforementioned centrifugal casting hot mold, step S1 includes:

[0077] S1-1, The tube mold 1 is rotatably placed on the support base 401 of the clamping and rotating device 4.

[0078] Depend on Figure 6 It is known that a rotatable support roller 4011 is provided on the support base 401. Placing the tube mold 1 on the support roller 4011 can assist the tube mold 1 in rotating. In the driving part, an elastic rubber pad can be placed between the semi-clamping wheel 402 and the tube mold 1 to adjust the clamping gap and provide a certain protection for the tube mold 1.

[0079] S1-2, the two semi-clamping wheels 402 are fitted onto the outer periphery of the tube mold 1 and then fastened together, and the combined clamping wheels are tightly fitted with the tube mold 1.

[0080] In this step, when the area to be repaired is the outer periphery of the mold 1, the position of the semi-clamping wheel 402 on the outer periphery of the mold 1 is adjusted to avoid the area to be repaired on the outer periphery of the mold 1. If the worker cannot completely avoid the area to be repaired on the outer periphery of the mold 1 by adjusting the position of the semi-clamping wheel 402 on the outer periphery of the mold 1 during operation, steps S1-S4 are performed first to repair the damage in other areas, and then the position of the semi-clamping wheel 402 on the outer periphery of the mold 1 is readjusted to repair the obscured area.

[0081] S1-3, put the transmission belt 403 on the clamping wheel and the drive wheel 404.

[0082] S1-4, Start the rotating motor 405 to drive the tube mold 1 to rotate and adjust its position.

[0083] S1-5, the height of the milling head is adjusted by the rod height adjustment device 504 so that the milling head does not interfere with the tube mold 1 when it is inserted into the tube mold 1 or the outer peripheral area.

[0084] S1-6, Adjust the length of the adjusting rod 503 so that the milling head moves to the area to be repaired.

[0085] S1-7, the height of the milling head is gradually adjusted by the rod height adjustment device 504 so that the milling head gradually contacts the tube mold 1 to remove the material from the area to be repaired. During this process, the material removal range is adjusted by rotating the tube mold 1.

[0086] S1-8, After completing the above steps, move the milling head outside the tube mold 1.

[0087] Step S2 includes:

[0088] S2-1, the height of the laser cladding head 301 is adjusted by the mounting height adjustment device 305 so that the laser cladding head 301 and the connecting rod 302 do not interfere with the tube mold 1 when they are inserted into the inside or outer periphery of the tube mold 1.

[0089] S2-2, Start the sliding motor 307 to move the laser cladding head 301 to the standard pit formed in S1. S2-3, Start the laser cladding host and fill the standard pit using a three-dimensional deposition method. During this process, the deposition path and filling range are adjusted by rotating the tube mold 1. After filling is completed, turn off the laser cladding host.

[0090] S2-4 After the above steps are completed, move the laser cladding head 301 outside the tube mold 1.

[0091] Step S4 includes:

[0092] S4-1, Remove the milling head from the end of the rod height adjustment device 504 and install the grinding head.

[0093] S4-2, the height of the grinding head is adjusted by the rod height adjustment device 504 so that the grinding head does not interfere with the tube mold 1 when it is inserted into the tube mold 1 or the outer peripheral area.

[0094] S4-3, adjust the length of the adjusting rod 503 so that the grinding head moves to the area to be ground.

[0095] S4-4, the height of the grinding head is gradually adjusted by the rod height adjustment device 504 so that the grinding head gradually contacts the tube mold 1 to grind the area to be ground smooth and flat. During this process, the grinding position and grinding range are adjusted by rotating the tube mold 1.

[0096] S4-5, After completing the above steps, move the grinding head outside the mold 1.

[0097] As can be seen, the repair method provided in this embodiment first removes the damaged area of ​​the mold to form a standard pit using a mechanized method, then fills the standard pit with laser cladding and polishes it smooth. This method can not only repair internal cracks of the mold, but also repair external damage to the mold. It has high production efficiency, and the standardized operation also improves the quality of repair.

[0098] Furthermore, in step S5, this embodiment can perform stress-relief annealing on the repaired part of the tube mold 1 to eliminate the thermal stress generated during the laser rapid melting and solidification three-dimensional repair process.

[0099] Stress-relief annealing of the tube mold 1 can generally be performed using an annealing furnace used in production to anneal cast pipe products. However, when the repair area is small, it is not economical to heat treat the entire tube mold 1. In this case, a special equipment for local heat treatment of the pipe can be used to carry out the stress-relief annealing process. This method will be introduced in the following embodiments.

[0100] Example 2

[0101] See Figure 9 and Figure 10 This embodiment uses Figure 9 and Figure 10 The provided local heat treatment equipment 6 facilitates the operation of small-scale local stress-relieving annealing of the tube mold 1.

[0102] Local heat treatment equipment 6 includes a support frame 61, a heating chamber 62, and a heating chamber drive assembly 64, such as Figure 9 As shown, a heating box 62 is connected between the two support frames 61 via a heating box drive assembly 64. Driven by the heating box drive assembly 64, the heating box 62 can move left and right between the two support frames 61 to adjust its position. In this embodiment, the heating box drive assembly 64 preferably uses a motor-screw drive assembly and is equipped with necessary guides 65, but other drive methods that can be conceived by those skilled in the art are also possible.

[0103] Further integration Figure 10 It is known that the heating box 62 has an openable structure, which is suitable for modification from a tubular electric furnace. It includes an upper half-cavity 621 and a lower half-cavity 622. The upper half-cavity 621 is open on the lower half-cavity 622, so that the tube mold 1 can be placed on the two side support frames 61. The upper half-cavity 621 is closed on the lower half-cavity 622, so that part of the tube mold 1 can be wrapped in the heating cavity. The upper half-cavity 621 is locked on the lower half-cavity 622 by the latch 63, so that the heating and heat preservation effect is better.

[0104] In addition Figure 10As can be seen, the upper half of the bore 621 and the lower half of the bore 622 have flanges 623 on the left and right sides of the semi-circular cavity that accommodates the pipe fitting. These flanges 623 can be used in conjunction with the insulation adjustment pads 624 made of insulation material to adapt to the pipe diameter fluctuation and the surrounding gaps of the pipe mold 1. Therefore, multiple insulation adjustment pads 624 of different thicknesses can be provided for use. The flanges 623 pressing the insulation adjustment pads 624 can also further enhance the edge insulation effect.

[0105] This embodiment provides another feasible operation method for stress-relief annealing in step S5 of embodiment 1. After step S4, the choice can be made based on the number of repaired parts on the tube mold 1: whether to place the tube mold 1 in an annealing furnace for stress-relief annealing or to use the local heat treatment equipment 6 of this embodiment to perform local annealing on the tube mold 1. Generally, when there are more than three repaired parts on the tube mold 1 and their distribution reaches more than one-third of the length of the tube mold 1, or when the repaired parts appear at the socket forming end (expanded end) of the tube mold 1, it is possible to place the tube mold 1 in an annealing furnace for stress-relief annealing; otherwise, the local heat treatment equipment 6 of this embodiment is used to perform local annealing on the tube mold 1.

[0106] The steps of performing local annealing on the tube mold 1 using the local heat treatment equipment 6 in this embodiment include:

[0107] S5-1 After the tube mold 1 is removed from the clamping and rotating device 4, it is hoisted to the heat treatment station and placed on the two side support frames 61 of the local heat treatment device 6.

[0108] S5-2, the heating box 62 is driven by the heating box drive assembly 64 to move between the two side support frames 61 until the heating chamber of the heating box 62 covers the part of the tube mold 1 that needs to be locally annealed.

[0109] S5-3, the upper half of the heating chamber 621 and the lower half of the heating chamber 62 are closed and locked to the part of the tube mold 1 that needs to be partially annealed. After locking, if the gap between the two sides of the heating chamber 62 and the tube mold 1 is large, a suitable heat-insulating and adjusting pad 624 is inserted and then the chamber is closed and locked again. Then, the power is turned on for heating. The heating chamber 62 can control the temperature and time, which is convenient for heating, heat preservation and cooling to be performed according to the annealing process.

[0110] S5-4, move the heating box 62 to another part of the tube mold 1 that needs to be partially annealed to perform the annealing process, or open the upper half of the heating box 62 621 and lift out the annealed tube mold 1.

[0111] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for repairing a hot mold used in centrifugal casting, characterized in that, Includes the following steps: S1, using the milling head of the milling and grinding equipment, the damaged area of ​​the tube mold (1) which is rotatably placed on the support of the clamping rotating equipment is removed to form a standard pit to be repaired; S2, a standard pit formed in step S1 by the three-dimensional repair of the laser cladding head (301) of the laser cladding equipment; S3, repeat steps S1 and S2 until all damage in all areas of the mold (1) is repaired; S4, replace the milling head of the milling and grinding equipment with a grinding head, and grind all the repaired areas to make the surface smooth and flat; S5, stress-relief annealing is performed on the repaired parts of the tube mold (1); when there are more than three repaired parts on the tube mold (1) and the distribution position has reached more than one-third of the length of the tube mold (1), or when the repaired parts appear at the socket forming end of the tube mold (1), the tube mold (1) is placed in the annealing furnace for stress-relief annealing; otherwise, the tube mold (1) is locally annealed using a local heat treatment device (6). The laser cladding equipment, clamping and rotating equipment, and milling and grinding equipment are all placed on the equipment base, with the clamping and rotating equipment in the middle; The clamping and rotating device includes a support base, half-clamping wheels, a transmission belt, a drive wheel, and a rotating motor. The support base is fixedly placed on the equipment base. A semi-circular hole is provided on the upper part of the support base. At least three rotatable support rollers are evenly distributed in the semi-circular hole. The tube mold is placed on the support rollers and can rotate. Two half-clamping wheels are fastened together with bolts to form a clamping wheel. The clamping wheel is fitted around the outer circumference of the tube mold and fits tightly with it. The outer circle of the clamping wheel is connected to the drive wheel through the transmission belt. The drive wheel is connected to the output shaft of the rotating motor. The length of the drive wheel is longer than the length of the clamping wheel so that the clamping wheel has a certain amount of adjustment in the left and right directions, which is used to avoid damage to the outer circumference when clamping the tube mold. The local heat treatment equipment includes a support frame, a heating box, and a heating box drive assembly. The heating box is connected between the two support frames via the heating box drive assembly. Driven by the heating box drive assembly, the heating box can move left and right between the two support frames to adjust its position. The heating box includes an upper half and a lower half. The upper half is open or closed on the lower half. The upper and lower half contain semi-circular cavities for accommodating pipe fittings. Flanges are provided on the left and right edges of these cavities. These cavities are fitted with insulation adjustment pads made of insulation material to accommodate the pipe diameter fluctuations and surrounding gaps of the pipe mold. Multiple insulation adjustment pads of different thicknesses are provided for use.

2. The method for repairing a hot mold used in centrifugal casting according to claim 1, characterized in that, Step S1 includes: S1-1, The tube mold (1) is rotatably placed on the support base (401) of the clamping and rotating device (4); S1-2, the two half clamping wheels (402) are fitted onto the outer periphery of the tube mold (1) and then fastened together. The combined clamping wheels and the tube mold (1) are tightly fitted together. S1-3, the transmission belt (403) is placed on the clamping wheel and the drive wheel (404); S1-4, start the rotating motor (405) to drive the tube mold (1) to rotate and adjust its position; S1-5, the height of the milling head is adjusted by the rod height adjustment device (504) so ​​that the milling head does not interfere with the tube mold (1) when it is inserted into the tube mold (1) or the outer peripheral area; S1-6, Adjust the length of the adjusting rod (503) so that the milling head moves to the area to be repaired; S1-7, the height of the milling head is gradually adjusted by the rod height adjustment device (504) so ​​that the milling head gradually contacts the tube mold (1) to remove the material in the area to be repaired. During this process, the material removal range is adjusted by rotating the tube mold (1). S1-8 After the above steps are completed, move the milling head outside the tube mold (1).

3. The method for repairing a hot mold used in centrifugal casting according to claim 2, characterized in that, Step S2 includes: S2-1, the height of the laser cladding head (301) is adjusted by the mounting height adjustment device (305) so that the laser cladding head (301) and the connecting rod (302) do not interfere with the tube mold (1) when they are inserted into the tube mold (1) or the outer peripheral area; S2-2, start the sliding motor (307) to move the laser cladding head (301) to the standard pit formed in S1; S2-3, start the laser cladding host and fill the standard pits by three-dimensional deposition. During this process, the deposition path and filling range are adjusted by rotating the tube mold (1). After filling is completed, turn off the laser cladding host. S2-4 After the above steps are completed, the laser cladding head (301) is moved outside the tube mold (1).

4. The method for repairing a hot mold used in centrifugal casting according to claim 3, characterized in that, Step S4 includes: S4-1, Remove the milling head from the end of the rod height adjustment device (504) and install the grinding head; S4-2, the height of the grinding head is adjusted by the rod height adjustment device (504) so ​​that the grinding head does not interfere with the tube mold (1) when it is inserted into the tube mold (1) or the outer peripheral area; S4-3, Adjust the length of the adjusting rod (503) so that the grinding head moves to the area to be ground; S4-4, the height of the grinding head is gradually adjusted by the rod height adjustment device (504) so ​​that the grinding head gradually contacts the tube mold (1) and the area to be ground is ground smooth and flat. During this process, the grinding position and grinding range are adjusted by rotating the tube mold (1). S4-5 After the above steps are completed, move the grinding head outside the mold (1).

5. The method for repairing a hot mold used in centrifugal casting according to claim 4, characterized in that, The steps of locally annealing the tube mold (1) using a local heat treatment device (6) include: S5-1, After the tube mold (1) is removed from the clamping and rotating device (4), it is hoisted to the heat treatment station and placed on the two side support frames (61) of the local heat treatment device (6); S5-2, the heating box (62) is driven by the heating box drive assembly (64) to move between the two side support frames (61) until the heating chamber of the heating box (62) covers the part of the tube mold (1) that needs to be locally annealed; S5-3, close and lock the upper half of the heating box (621) and the lower half of the heating box (622) to the part of the tube mold (1) that needs to be locally annealed, and perform heating, heat preservation and cooling according to the annealing process; S5-4, move the heating box (62) to another part of the tube mold (1) that needs to be locally annealed and perform the annealing process, or open the upper half of the heating box (621) and lift out the annealed tube mold (1).

6. A method for repairing a hot mold used in centrifugal casting according to any one of claims 2-5, characterized in that, In step S1-2, when the area to be repaired is the outer periphery of the tube mold (1), the position of the half clamping wheel (402) on the outer periphery of the tube mold (1) is adjusted to avoid the area to be repaired on the outer periphery of the tube mold (1).

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