CN118463585A - A casting process for a high temperature resistant large kiln rotary kiln support wheel assembly - Google Patents

Abstract

The present invention discloses a casting process of a high-temperature resistant large-scale kiln rotary kiln supporting roller assembly, which relates to the technical field of supporting roller assembly casting, including a supporting roller assembly, wherein the supporting roller assembly includes a supporting roller body, and supporting roller shafts are installed at both ends of the supporting roller body, and the supporting roller body and the supporting roller shaft are formed by integral casting, and the supporting roller body and the supporting roller shaft are provided with cooling liquid through grooves. The present invention can input and output cooling liquid into and out of the cooling liquid through grooves without hindering the rotation of the supporting roller body and the supporting roller shaft by providing the existing cooling liquid through grooves and rotary joints, thereby improving the cooling effect of the supporting roller body and the supporting roller shaft, and can fine-tune the angle of the supporting seat by providing the fixing seat and the base, and the threaded rod inserted into the arc groove can limit the amplitude of the fixing seat angle adjustment, thereby adjusting the angle of the supporting roller body, ensuring that the supporting roller body is parallel to the angle of the rotary kiln roller body, thereby improving the service life of the supporting roller assembly.

Description

A casting process for a high temperature resistant large kiln rotary kiln support wheel assembly

Technical Field

The invention relates to the technical field of casting of a supporting wheel assembly, in particular to a casting process of a high-temperature resistant large-scale kiln rotary kiln supporting wheel assembly.

Background Art

The supporting wheel assembly of a large kiln rotary kiln is an important component of the kiln system. It is mainly used to support and rotate the rotating part of the kiln. The supporting wheel is the main load-bearing part of the assembly and needs to bear the weight of the kiln and various forces during operation. In the process of rotating the kiln, continuous rotation will cause the heat of the supporting wheel to increase. Therefore, high-strength, high-temperature-resistant and wear-resistant materials are required.

The existing high temperature resistant large kiln rotary kiln support wheel assembly has the following defects:

1. Patent document CN215676386U discloses a high temperature and wear resistant large kiln rotary kiln supporting wheel assembly, but the above document cannot adjust the angle of the supporting wheel assembly according to the angle of the rotary kiln roller body, which easily leads to the technical problem that the supporting wheel assembly is easily damaged;

2. Patent document CN110270266A discloses a mixer support wheel and its processing technology. However, the temperature and time of the smelting and pouring processes are not strictly controlled in the above document during the casting process, making it difficult to ensure the hardness and toughness of the casting;

3. Patent document CN217890401U discloses a large-scale kiln rotary kiln support wheel assembly grinding robot. However, the above document does not perform carburization treatment on the surface of the rotary kiln support wheel assembly after grinding, which easily leads to a technical problem of reducing the service life of the support wheel assembly;

4. Patent document CN113606257A discloses a processing technology for a mixer wheel bracket base, but the above document does not adopt an integrated casting process, which easily causes material waste during the casting process, and the connection positions where multiple castings are connected are prone to damage.

Summary of the invention

The object of the present invention is to provide a high temperature resistant casting process for a large-scale kiln rotary kiln support wheel assembly to solve the technical problems raised in the above background technology.

To achieve the above object, the present invention provides the following technical solution: a high temperature resistant large-scale kiln rotary kiln supporting wheel assembly, comprising a supporting wheel assembly, the supporting wheel assembly comprising a supporting wheel body, both ends of the supporting wheel body are equipped with supporting wheel shafts, the supporting wheel body and the supporting wheel shaft are integrally cast, the supporting wheel body and the supporting wheel shaft are both provided with cooling liquid grooves, and both ends of the cooling liquid grooves are movably connected with rotating joints;

The outer wall of the supporting wheel shaft is movably connected with an upper bearing seat and a lower bearing seat through a bearing, and the top of the lower bearing seat is connected with the upper bearing seat through bolts, and the bottom of the lower bearing seat is fixedly connected with a fixing seat, the lower bearing seat and the fixing seat are integrally cast, and the front and back sides of the fixing seat are both provided with arc grooves;

The bottom of the fixing seat is movably connected with a base, and a group of threaded holes are provided on the front and back of the base. The inner walls of the threaded holes are threadedly connected with threaded rods, and the front end of the threaded rods is not provided with threads. The front end of the threaded rods is movably connected to the inner wall of the arc groove. The top of the base is provided with a groove, and the groove is movably connected to the bottom of the outer wall of the fixing seat. The inner wall of the groove is provided with a plurality of installation grooves, and the inner wall of the installation groove is movably connected with a plurality of rollers, and the outer wall of the roller is movably connected to the bottom of the outer wall of the fixing seat.

Preferably, the casting steps of the high temperature resistant large kiln rotary kiln support wheel assembly are as follows:

S1. Mould design and manufacturing: According to the shapes and sizes of the various components of the supporting wheel assembly, design precise casting moulds, and use high-strength and high-temperature resistant materials to manufacture the moulds to ensure that they can withstand high temperatures and high pressures;

S2. Material selection and preparation: Select alloy materials with excellent high temperature resistance, and conduct strict chemical analysis and physical property tests on the raw materials to ensure that they meet the design requirements;

S3, Melting and pouring: Place the selected alloy material with excellent high temperature resistance into a high temperature melting furnace for melting treatment, strictly control the melting temperature, and record the melting temperature and time, and pour the molten metal into the prepared multiple molds to ensure that the molten metal fills the entire mold;

S4, demoulding and cleaning: After the molten metal in the mold is completely solidified, the mold is opened for demoulding to obtain the required metal casting, and impurities and burrs on the surface of the metal casting are cleaned;

S5. Heat treatment: Annealing, normalizing, quenching and tempering are performed on the cleaned metal castings to eliminate casting stress, improve organizational stability and improve performance;

S6. Sandblasting and carburizing: Put the heat-treated metal casting into the sandblasting machine, and clean and roughen the surface of the metal casting by sandblasting, increase the roughness of the metal casting surface, and improve the adhesion and diffusion effect of active carburizing during carburizing. Carburizing is to place the metal casting in a heating environment with active carburizing medium to make carbon atoms penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer;

S7. Processing and installation: Obtain the integrally cast supporting roller body and supporting roller shaft with coolant grooves through the mold, and install the rotary joints at both ends of the coolant grooves respectively, install the supporting roller shaft in the bearings fixed by the upper bearing seat and the lower bearing seat, and then install the fixing seat in the groove where the roller has been installed, and finally use a threaded rod to install it into the threaded groove, and move the area at the front end of the threaded rod where no thread is set to the arc groove, so as to obtain the cast and installed supporting roller assembly.

Preferably, the alloy material in S2 is a nickel-based alloy or a cobalt-based alloy.

Preferably, the smelting temperature in S3 is 1350° C.-1400° C., and the smelting time is 15 min-25 min.

Preferably, the pouring temperature in S3 is 1300° C.-1340° C., and the pouring time is 30s-40s.

Preferably, in the annealing process flow of S5, the cast casting is subjected to step heating. After being heated to 820°C-860°C, the casting is subjected to heat preservation treatment for 4 hours and slowly cooled to room temperature with the furnace to eliminate residual stress inside the workpiece and prevent deformation and cracking.

Preferably, in the normalizing process in S5, the cast casting is subjected to step heating. After being heated to 900°C-960°C, the casting is subjected to insulation treatment for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature, so as to increase the hardness and strength of the material and further eliminate residual stress.

Preferably, in the quenching process in S5, the cast casting is subjected to step heating. After being heated to 840°C-860°C, the casting is subjected to heat preservation treatment for 4 hours. The casting is taken out and placed in the air to slowly cool to room temperature, so as to increase the rigidity and wear resistance of the material.

Preferably, in the tempering process flow of S5, the cast casting is subjected to step heating. After being heated to 620°C-680°C, the casting is subjected to heat preservation treatment for 1 hour, and then slowly cooled to room temperature with the furnace to eliminate the brittleness generated during the quenching process and to achieve a more balanced hardness and toughness of the material.

Preferably, the coolant through groove (14) is provided in S6, and the surface of the coolant through groove (14) needs to be ground, polished and rust-proofed to increase the service life of the coolant through groove (14).

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention can input and output coolant into the coolant groove without hindering the rotation of the roller body and the roller shaft by providing the existing coolant groove and the rotary joint, thereby improving the cooling effect of the roller body and the roller shaft. The angle of the fixed seat can be finely adjusted by providing the fixed seat and the base. The threaded rod inserted into the arc groove can limit the adjustment range of the fixed seat angle, thereby adjusting the angle of the roller body, ensuring that the angle of the roller body is parallel to the angle of the rotary kiln roller body, thereby improving the service life of the roller assembly.

2. The present invention strictly controls the temperature and time of the smelting and pouring processes through multiple groups of tests, which is beneficial to improving the integrity rate of the obtained castings and reducing the probability of pores in the castings. The heating temperature in annealing, normalizing, quenching and tempering treatments is strictly controlled, which is beneficial to ensuring the hardness and toughness of the obtained castings, thereby improving the quality and durability of the supporting wheel assembly;

3. The present invention places the heat-treated metal casting into a sandblasting machine, cleans and roughens the surface of the metal casting by sandblasting, increases the roughness of the surface of the metal casting, improves the adhesion and diffusion effect of active carburizing during carburizing, and then places the metal casting in a heating environment with an active carburizing medium to allow carbon atoms to penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer, thereby improving the quality and service life of the supporting wheel assembly;

4. The present invention can improve the high temperature resistance of metal castings by selecting nickel-based alloys or cobalt-based alloys with high strength and high temperature resistance. The nickel-based alloys and cobalt-based alloys have good fluidity and filling properties in the molten state, which can ensure the precise molding and high quality of the support wheel assembly. By arranging multiple devices into an integrated casting molding setting, it is beneficial to improve the casting quality and production efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG2 is a schematic diagram of the front cross-sectional structure of the present invention;

FIG. 3 is a schematic diagram of the casting process of the present invention.

In the figure: 2, supporting roller body; 3, supporting roller shaft; 4, upper bearing seat; 5, lower bearing seat; 6, fixing seat; 7, arc groove; 8, base; 9, threaded hole; 10, threaded rod; 11, groove; 12, mounting groove; 13, roller; 14, coolant channel; 15, rotary joint.

DETAILED DESCRIPTION

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.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Embodiment 1: Please refer to FIG. 1 and FIG. 2 , an embodiment provided by the present invention: a high temperature resistant large kiln rotary kiln supporting wheel assembly, comprising a supporting wheel assembly, the supporting wheel assembly comprising a supporting wheel body 2, both ends of the supporting wheel body 2 are equipped with supporting wheel shafts 3, the supporting wheel body 2 and the supporting wheel shaft 3 are integrally cast, the supporting wheel body 2 and the supporting wheel shaft 3 are both provided with cooling liquid grooves 14, and both ends of the cooling liquid grooves 14 are movably connected with rotary joints 15;

The outer wall of the supporting wheel shaft 3 is movably connected with an upper bearing seat 4 and a lower bearing seat 5 through a bearing, and the top of the lower bearing seat 5 is connected with the upper bearing seat 4 through bolts, and the bottom of the lower bearing seat 5 is fixedly connected with a fixing seat 6, the lower bearing seat 5 and the fixing seat 6 are integrally cast, and the front and back sides of the fixing seat 6 are provided with arc grooves 7;

The bottom of the fixed seat 6 is movably connected with a base 8, and a group of threaded holes 9 are provided on the front and back of the base 8. The inner wall of the threaded hole 9 is threadedly connected with a threaded rod 10, and the front end of the threaded rod 10 is not provided with a thread. The front end of the threaded rod 10 is movably connected to the inner wall of the arc groove 7, and a groove 11 is provided on the top of the base 8, and the groove 11 is movably connected to the bottom of the outer wall of the fixed seat 6. The inner wall of the groove 11 is provided with a plurality of mounting grooves 12, and the inner wall of the mounting groove 12 is movably connected with a plurality of rollers 13, and the outer wall of the roller 13 is movably connected to the bottom of the outer wall of the fixed seat 6;

In S6, a coolant groove 14 is provided, and the surface of the coolant groove 14 needs to be ground, polished and rust-proofed to increase the service life of the coolant groove 14.

Furthermore, the one-piece casting is beneficial to improving the casting quality and production efficiency. By providing the coolant groove 14 and the rotary joint 15, the coolant can be input and output into the coolant groove 14 without hindering the rotation of the roller body 2 and the roller shaft 3, thereby improving the cooling effect of the roller body 2 and the roller shaft 3. By providing the fixing seat 6 and the base 8, the angle of the fixing seat 6 can be fine-tuned. The threaded rod 10 inserted into the arc groove 7 can limit the adjustment range of the angle of the fixing seat 6, thereby adjusting the angle of the roller body 2 to ensure that the roller body 2 is parallel to the angle of the rotary kiln roller body, thereby improving the service life of the roller assembly.

The casting steps of the high temperature resistant large kiln rotary kiln support wheel assembly are as follows:

Embodiment 2: Please refer to FIG. 3 , an embodiment provided by the present invention: the casting steps of the high temperature resistant large kiln rotary kiln support wheel assembly are as follows:

S1. Mould design and manufacturing: According to the shapes and sizes of the various components of the supporting wheel assembly, design precise casting moulds, and use high-strength and high-temperature resistant materials to manufacture the moulds to ensure that they can withstand high temperatures and high pressures;

S2. Material selection and preparation: Select alloy materials with excellent high temperature resistance, and conduct strict chemical analysis and physical property tests on the raw materials to ensure that they meet the design requirements;

S3, Melting and pouring: Place the selected alloy material with excellent high temperature resistance into a high temperature melting furnace for melting treatment, strictly control the melting temperature, and record the melting temperature and time, and pour the molten metal into the prepared multiple molds to ensure that the molten metal fills the entire mold;

S4, demoulding and cleaning: After the molten metal in the mold is completely solidified, the mold is opened for demoulding to obtain the required metal casting, and impurities and burrs on the surface of the metal casting are cleaned;

S5. Heat treatment: Annealing, normalizing, quenching and tempering are performed on the cleaned metal castings to eliminate casting stress, improve organizational stability and improve performance;

S6. Sandblasting and carburizing: Put the heat-treated metal casting into the sandblasting machine, and clean and roughen the surface of the metal casting by sandblasting, increase the roughness of the metal casting surface, and improve the adhesion and diffusion effect of active carburizing during carburizing. Carburizing is to place the metal casting in a heating environment with active carburizing medium to make carbon atoms penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer;

S7, processing and installation: obtain the integrally cast supporting roller body 2 and supporting roller shaft 3 with coolant through groove 14 through the mold, and install the rotary joint 15 at both ends of the coolant through groove 14 respectively, install the supporting roller shaft 3 in the bearings fixed by the upper bearing seat 4 and the lower bearing seat 5, and then install the fixing seat 6 in the groove 11 where the roller 13 has been installed, and finally use the threaded rod 10 to thread into the threaded groove, and move the area at the front end of the threaded rod 10 without thread to the arc groove 7, so as to obtain the cast and installed supporting roller assembly;

The alloy material used in S2 is one of nickel-based alloy or cobalt-based alloy;

Furthermore, by selecting nickel-based alloys or cobalt-based alloys with high strength and high temperature resistance, the high temperature resistance of metal castings can be improved, and nickel-based alloys and cobalt-based alloys have good fluidity and filling properties in the molten state, which can ensure the precise molding and high quality of the roller assembly, and thus more precise size and shape can be obtained during the manufacturing process, thereby improving the overall performance and service life of the roller assembly.

Embodiment 3: Please refer to FIG. 3 , an embodiment provided by the present invention: the casting steps of the high temperature resistant large kiln rotary kiln support wheel assembly are as follows:

S1. Mould design and manufacturing: According to the shapes and sizes of the various components of the supporting wheel assembly, design precise casting moulds, and use high-strength and high-temperature resistant materials to manufacture the moulds to ensure that they can withstand high temperatures and high pressures;

S2. Material selection and preparation: Select alloy materials with excellent high temperature resistance, and conduct strict chemical analysis and physical property tests on the raw materials to ensure that they meet the design requirements;

S3, Melting and pouring: Place the selected alloy material with excellent high temperature resistance into a high temperature melting furnace for melting treatment, strictly control the melting temperature, and record the melting temperature and time, and pour the molten metal into the prepared multiple molds to ensure that the molten metal fills the entire mold;

S4, demoulding and cleaning: After the molten metal in the mold is completely solidified, the mold is opened for demoulding to obtain the required metal casting, and impurities and burrs on the surface of the metal casting are cleaned;

S5. Heat treatment: Annealing, normalizing, quenching and tempering are performed on the cleaned metal castings to eliminate casting stress, improve organizational stability and improve performance;

S6. Sandblasting and carburizing: Put the heat-treated metal casting into the sandblasting machine, and clean and roughen the surface of the metal casting by sandblasting, increase the roughness of the metal casting surface, and improve the adhesion and diffusion effect of active carburizing during carburizing. Carburizing is to place the metal casting in a heating environment with active carburizing medium to make carbon atoms penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer;

S7, processing and installation: obtain the integrally cast supporting roller body 2 and supporting roller shaft 3 with coolant through groove 14 through the mold, and install the rotary joint 15 at both ends of the coolant through groove 14 respectively, install the supporting roller shaft 3 in the bearings fixed by the upper bearing seat 4 and the lower bearing seat 5, and then install the fixing seat 6 in the groove 11 where the roller 13 has been installed, and finally use the threaded rod 10 to thread into the threaded groove, and move the area at the front end of the threaded rod 10 without thread to the arc groove 7, so as to obtain the cast and installed supporting roller assembly;

The smelting temperature in S3 is 1370°C and the smelting time is 20 min;

The pouring temperature in S3 is 1320°C and the pouring time is 35 seconds.

Example 4: Please refer to FIG. 3 , an example provided by the present invention: the specific implementation is the same as that of Example 3, except that the temperature during smelting in S3 is 1300° C.-1400° C., and the smelting time is 13 minutes;

The pouring temperature in S3 is 1260°C and the pouring time is 35 seconds.

Example 5: Please refer to FIG. 3 , an example provided by the present invention: the specific implementation is the same as that of Example 3, except that the smelting temperature in S3 is 1370° C. and the smelting time is 20 min;

The pouring temperature in S3 is 1320°C and the pouring time is 20s.

Example 6: Please refer to FIG. 3 , an example provided by the present invention: the specific implementation is the same as that of Example 3, except that the smelting temperature in S3 is 1370° C. and the smelting time is 20 min;

The pouring temperature in S3 is 1320°C and the pouring time is 40s.

Test 1: The castings cast in Examples 3-5 were tested:

Casting integrity rate % Casting porosity% Example 3 99.4 0.5 Example 4 90.5 4 Example 5 86.3 10 Example 6 83.2 4

Furthermore, by strictly controlling the temperature and time during the smelting and pouring process, it is helpful to improve the integrity rate of the casting and reduce the probability of pores. When the melting temperature does not meet the standard, there will be particles or impurities in the molten metal, making it difficult for the casting to fill the mold and there will be pores. If the pouring time is too long, it is easy for the molten metal to overcool in the mold. If the pouring time is too short, it is easy for the gas in the mold to be unable to be fully discharged, resulting in incomplete castings and the presence of pores.

Embodiment 7: Please refer to FIG. 3 , an embodiment provided by the present invention: the casting steps of the high temperature resistant large kiln rotary kiln support wheel assembly are as follows:

S1. Mould design and manufacturing: According to the shapes and sizes of the various components of the supporting wheel assembly, design precise casting moulds, and use high-strength and high-temperature resistant materials to manufacture the moulds to ensure that they can withstand high temperatures and high pressures;

S2. Material selection and preparation: Select alloy materials with excellent high temperature resistance, and conduct strict chemical analysis and physical property tests on the raw materials to ensure that they meet the design requirements;

S3, Melting and pouring: Place the selected alloy material with excellent high temperature resistance into a high temperature melting furnace for melting treatment, strictly control the melting temperature, and record the melting temperature and time, and pour the molten metal into the prepared multiple molds to ensure that the molten metal fills the entire mold;

S4, demoulding and cleaning: After the molten metal in the mold is completely solidified, the mold is opened for demoulding to obtain the required metal casting, and impurities and burrs on the surface of the metal casting are cleaned;

S5. Heat treatment: Annealing, normalizing, quenching and tempering are performed on the cleaned metal castings to eliminate casting stress, improve organizational stability and improve performance;

S6. Sandblasting and carburizing: Put the heat-treated metal casting into the sandblasting machine, and clean and roughen the surface of the metal casting by sandblasting, increase the roughness of the metal casting surface, and improve the adhesion and diffusion effect of active carburizing during carburizing. Carburizing is to place the metal casting in a heating environment with active carburizing medium to make carbon atoms penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer;

S7, processing and installation: obtain the integrally cast supporting roller body 2 and supporting roller shaft 3 with coolant through groove 14 through the mold, and install the rotary joint 15 at both ends of the coolant through groove 14 respectively, install the supporting roller shaft 3 in the bearings fixed by the upper bearing seat 4 and the lower bearing seat 5, and then install the fixing seat 6 in the groove 11 where the roller 13 has been installed, and finally use the threaded rod 10 to thread into the threaded groove, and move the area at the front end of the threaded rod 10 without thread to the arc groove 7, so as to obtain the cast and installed supporting roller assembly;

In the annealing process of S5, the casting is heated in a step-wise manner. After heating to 840°C, the casting is kept warm for 4 hours and then slowly cooled to room temperature with the furnace to eliminate the residual stress inside the workpiece and prevent deformation and cracking.

In the normalizing process of S5, the casting is heated in a step-wise manner. After heating to 930°C, the casting is kept warm for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature, which is used to increase the hardness and strength of the material and further eliminate residual stress.

In the quenching process of S5, the casting is heated in a step-wise manner. After heating to 850°C, the casting is kept warm for 4 hours. The casting is taken out and placed in the air to slowly cool to room temperature to increase the rigidity and wear resistance of the material.

In the tempering process of S5, the casting is heated in a step-wise manner. After heating to 650°C, the casting is kept warm for 1 hour and then slowly cooled to room temperature with the furnace to eliminate the brittleness generated during the quenching process and achieve a more balanced hardness and toughness of the material.

Example 8: Please refer to FIG. 3 , an example provided by the present invention: the specific implementation is the same as that of Example 7, except that, in the annealing process flow in S5, the casting is heated in a stepwise manner, and after being heated to 650° C., the casting is subjected to a heat preservation treatment for 4 hours, and then slowly cooled to room temperature with the furnace;

In the normalizing process of S5, the casting is heated in a step-wise manner. After heating to 800°C, the casting is kept warm for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

In the quenching process of S5, the casting is heated in a step-wise manner. After heating to 650°C, the casting is kept warm for 4 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

In the tempering process of S5, the casting is heated in a step-wise manner. After being heated to 450°C, the casting is kept warm for 1 hour and then slowly cooled to room temperature in the furnace.

Embodiment 9: Please refer to FIG. 3 , an embodiment provided by the present invention: in the annealing process flow in S5 , the casting is heated in a stepwise manner to 1000° C., and then the casting is subjected to heat preservation treatment for 4 hours, and then slowly cooled to room temperature with the furnace;

In the normalizing process of S5, the casting is heated in a step-wise manner. After heating to 1050°C, the casting is kept warm for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

In the quenching process of S5, the casting is heated in a step-wise manner. After heating to 980°C, the casting is kept warm for 4 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

In the tempering process of S5, the casting is heated in a step-wise manner. After being heated to 820°C, the casting is kept warm for 1 hour and then slowly cooled to room temperature in the furnace.

Example 10: Please refer to FIG. 3 , an example provided by the present invention: the specific implementation method is the same as that of Example 7, except that, in the annealing process flow in S5, the casting is heated in a stepwise manner, and after being heated to 650° C., the casting is subjected to a heat preservation treatment for 4 hours, and then slowly cooled to room temperature with the furnace;

In the normalizing process of S5, the casting is heated in a step-by-step manner. After heating to 800°C, the casting is kept warm for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

Embodiment 11: Please refer to FIG. 3 , an embodiment provided by the present invention: in the annealing process flow in S5, the casting is heated in a stepwise manner to 1000° C., and then the casting is subjected to heat preservation treatment for 4 hours, and then slowly cooled to room temperature with the furnace;

In the normalizing process of S5, the casting is heated in a step-by-step manner. After heating to 1050°C, the casting is kept warm for 5 hours. The casting is taken out and placed in the air to slowly cool to room temperature.

Test 2: Comparative data on hardness, toughness and residual stress of the casting obtained in Example 7 and the casting obtained in Examples 8-11 were used, and the hardness and toughness of the casting data in Example 7 were set to 100 and 100, respectively.

hardness toughness Example 7 100 100 Example 8 70.3 68.5 Example 9 65.8 70.2 Example 10 82.2 72.2 Embodiment 11 79.5 75.4

Furthermore, strictly controlling the heating temperature during annealing, normalizing, quenching and tempering in the heat treatment is beneficial to ensuring the hardness and toughness of the casting.

Working principle: the setting of one-piece casting is beneficial to improving the casting quality and production efficiency. By setting the existing coolant groove 14 and the rotary joint 15, the coolant can be input and output into the coolant groove 14 without hindering the rotation of the roller body 2 and the roller shaft 3, thereby improving the cooling effect of the roller body 2 and the roller shaft 3. By setting the fixed seat 6 and the base 8, the angle of the fixed seat 6 can be fine-tuned. The threaded rod 10 inserted into the arc groove 7 can limit the adjustment range of the angle of the fixed seat 6, thereby adjusting the angle of the roller body 2 to ensure that the angle of the roller body 2 is parallel to the angle of the rotary kiln roller body, thereby improving the service life of the roller assembly. By putting the heat-treated metal casting into the sandblasting machine, the surface of the metal casting is cleaned and roughened by sandblasting, the roughness of the metal casting surface is increased, and the adhesion and diffusion effect of active carburizing during carburizing is improved. Carburizing is to The metal casting is placed in a heating environment with an active carburizing medium to allow carbon atoms to penetrate into the surface of the steel part, thereby obtaining a high-carbon surface layer, thereby improving the quality and service life of the roller assembly. Through multiple groups of tests, the temperature and time of the smelting and pouring processes are strictly controlled, which is beneficial to improving the integrity rate of the casting and reducing the probability of pores in the casting. Strictly controlling the heating temperature during annealing, normalizing, quenching and tempering treatments is beneficial to ensuring the hardness and toughness of the casting, thereby improving the quality and durability of the roller assembly. By selecting nickel-based alloys or cobalt-based alloys with high strength and high temperature resistance, the high temperature resistance of metal castings can be improved, and nickel-based alloys and cobalt-based alloys have good fluidity and filling properties in the molten state, which can ensure the precise forming and high quality of the roller assembly, and thus more precise size and shape can be obtained during the manufacturing process, thereby improving the overall performance and service life of the roller assembly.

It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims (10)

1. The utility model provides a high temperature resistant large-scale kiln rotary kiln riding wheel subassembly, includes riding wheel subassembly, its characterized in that: the riding wheel assembly comprises a riding wheel body (2), riding wheel shafts (3) are arranged at two ends of the riding wheel body (2), the riding wheel body (2) and the riding wheel shafts (3) are integrally cast, cooling liquid through grooves (14) are formed in the riding wheel body (2) and the riding wheel shafts (3), and rotary connectors (15) are movably connected at two ends of the cooling liquid through grooves (14);

The outer wall of the riding wheel shaft (3) is movably connected with an upper bearing seat (4) and a lower bearing seat (5) through bearings, the top of the lower bearing seat (5) is connected with the upper bearing seat (4) through bolts, the bottom of the lower bearing seat (5) is fixedly connected with a fixing seat (6), the lower bearing seat (5) and the fixing seat (6) are integrally cast, and the front surface and the back surface of the fixing seat (6) are provided with arc-shaped grooves (7);

Fixing base (6) bottom swing joint has base (8), a set of screw hole (9) have all been seted up to the front and the back of base (8), the inner wall threaded connection of screw hole (9) has threaded rod (10), the front end of threaded rod (10) is not provided with the screw thread, the front end swing joint of threaded rod (10) is in the inner wall of arc wall (7), recess (11) have been seted up at base (8) top, and recess (11) swing joint in the bottom of fixing base (6) outer wall, a plurality of mounting groove (12) have been seted up to the inner wall of recess (11), the inner wall swing joint of mounting groove (12) has a plurality of gyro wheel (13), and the outer wall swing joint of gyro wheel (13) is in the bottom of fixing base (6) outer wall.

2. A casting process of a high-temperature-resistant rotary kiln riding wheel assembly of a large kiln, which is applicable to the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln according to claim 1, and is characterized in that: the casting steps of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln are as follows:

s1, designing and manufacturing a die: according to the shape and the size of each component included in the riding wheel assembly, an accurate casting mould is designed, and a high-strength high-temperature-resistant material is adopted to manufacture the mould, so that the bearing of high temperature and high pressure is ensured;

S2, material selection and preparation: selecting an alloy material with excellent high temperature resistance, and carrying out strict chemical analysis and physical property test on the raw material to ensure that the alloy material meets the design requirements;

S3, smelting and pouring: placing the selected alloy material with excellent high temperature resistance into a high-temperature smelting furnace for smelting treatment, strictly controlling the smelting temperature, recording the smelting temperature and the smelting time, pouring the smelted molten metal into a plurality of prepared moulds, and ensuring that the molten metal fills the whole mould;

S4, demolding and cleaning: after the molten metal in the mold is completely solidified, opening the mold to perform demolding, obtaining a required metal casting, and cleaning impurities and burrs on the surface of the metal casting;

s5, heat treatment: annealing, normalizing, quenching and tempering the cleaned metal casting to eliminate casting stress, improve tissue stability and improve performance;

S6, sand blasting and carburizing: placing the metal casting after heat treatment into a sand blasting machine, cleaning and roughening the surface of the metal casting by sand blasting, increasing the roughness of the surface of the metal casting, and improving the adhesion and diffusion effects of active carburization during carburization, wherein the carburization is to place the metal casting in a heating environment with active carburization medium, so that carbon atoms penetrate into the surface layer of a steel part, thereby obtaining a high-carbon surface layer;

S7, processing and installing: the die is used for obtaining the integral casting formed riding wheel body (2) and riding wheel shaft (3) with the cooling liquid through groove (14), rotating joints (15) are respectively arranged at two ends of the cooling liquid through groove (14), the riding wheel shaft (3) is arranged in bearings fixed by the upper bearing seat (4) and the lower bearing seat (5), the fixing seat (6) is arranged in a groove (11) in which the idler wheel (13) is arranged, finally, a threaded rod (10) is used for being installed in a threaded groove, the front end of the threaded rod (10) is not provided with a threaded area, and the rotating joints are moved into the arc-shaped groove (7), so that a riding wheel assembly which is cast and installed is obtained.

3. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: the alloy material in the S2 is one of nickel-based alloy and cobalt-based alloy.

4. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: the smelting temperature in the step S3 is 1350-1400 ℃, and the smelting time is 15-25 min.

5. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: the temperature of the casting in the step S3 is 1300-1340 ℃, and the casting time is 30-40S.

6. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: and in the annealing process flow in the step S5, the cast casting is heated to 820-860 ℃ in a step heating mode, and then is subjected to heat preservation treatment for 4 hours, and is slowly cooled to room temperature along with a furnace, so that the residual stress in the workpiece is eliminated, and deformation and cracking are prevented.

7. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: and (5) adopting a step heating mode to cast castings, carrying out heat preservation treatment on the castings after the castings are heated to 900-960 ℃, wherein the heat preservation time is 5h, taking out the castings, placing the castings in air, slowly cooling the castings to room temperature for increasing the hardness and strength of materials, and further eliminating residual stress.

8. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: and S5, the quenching process flow adopts a step heating mode to heat the cast casting to 840-860 ℃, then carries out heat preservation treatment on the casting for 4 hours, takes out the casting, and slowly cools the casting to room temperature in air for increasing the rigidity and the wear resistance of the material.

9. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: and in the tempering process flow in the step S5, the cast casting is heated to 620-680 ℃ in a step heating mode, then the casting is subjected to heat preservation treatment, the heat preservation time is 1h, and the casting is slowly cooled to room temperature along with a furnace, so that brittleness generated in the quenching process is eliminated, and the hardness and toughness of the material reach a more balanced state.

10. The casting process of the high-temperature-resistant rotary kiln riding wheel assembly of the large kiln as recited in claim 2, wherein the casting process comprises the following steps of: and S6, a cooling liquid through groove (14) is formed, and polishing, polishing and rust prevention treatment are required to be carried out on the surface of the cooling liquid through groove (14) so as to prolong the service life of the cooling liquid through groove (14).