Drying process for lower casting mold of high manganese steel frog

Abstract

According to the high-manganese steel frog lower casting mold drying process, a high-manganese steel frog lower casting mold drying device is provided, and the device is provided with a movable cover plate covering the upper end face of a high-manganese steel frog lower casting mold; the movable cover plate is provided with a hot air pipe, and hot air is introduced into the hot air pipe to dry the high manganese steel frog lower casting mold cavity. The technical problem of how to dry the lower casting mold of the high manganese steel frog is solved, the thick coating part can be completely dried in a short time, the thick coating part is dried and crusting is achieved, the scouring influence of molten steel on the casting mold in the pouring process is reduced, and the water content of the thick coating part and the surface layer of the lower casting mold is reduced; the air pressure in the lower casting mold cavity is increased during drying, so that the water in the inner surface layer of the casting mold can migrate to the outer surface layer and volatilize, and the overall water content of the casting mold is reduced, so that the surface quality of the casting is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of operation transportation mold drying, and particularly relates to a drying process for the lower mold of a high manganese steel frog. Background Art

[0002] The frog company of China National Railway Baqiao Group mainly produces high manganese steel frogs. The frog mold is made of molding sand mixed with water glass and water as binders and forsterite sand. Among them, the coating sprayed in the cavity of the lower mold of the high manganese steel frog is an alcohol-based magnesia coating, and thick coating is applied locally on the cavity. After the coating burns, the water content in the thick coating part and the inside of the mold increases. Coupled with the increase in summer temperature, the amount of water glass added decreases, and the amount of water added increases, resulting in a relatively high air humidity inside the workshop. The moisture in the mold cannot evaporate quickly. Finally, when pouring, the moisture in the mold quickly vaporizes, increasing the air pressure inside the mold and affecting the surface quality of the casting. In response to this, the following improved technical solutions are proposed. Summary of the Invention

[0003] The technical problem solved by the present invention: Provide a drying process for the lower mold of a high manganese steel frog to solve the technical problem of how to dry the lower mold of a high manganese steel frog.

[0004] The technical solution adopted by the present invention: A drying process for the lower mold of a high manganese steel frog, having a drying device for the lower mold of a high manganese steel frog. The device has a movable cover plate covering the upper end face of the lower mold of a high manganese steel frog; a hot air pipe is arranged on the movable cover plate, and hot air is passed through the hot air pipe to dry the cavity of the lower mold of a high manganese steel frog.

[0005] In the above technical solution, further: 1 to 4 hot air pipes are evenly arranged on the movable cover plate.

[0006] In the above technical solution, preferably: The hot air pipe is connected to an electric hot air blower to pass hot air for drying.

[0007] In the above technical solution, further: The hot air pipe is detachably connected to the movable cover plate.

[0008] In the above technical solution, further: For a longer lower mold of a high manganese steel frog, drying is achieved by moving the movable cover plate in sections and batches.

[0009] In the above technical solution, further: The hot air temperature for each drying is 100 - 300 °C, and the drying time for each time is 5 - 20 min.

[0010] In the above technical solution, the drying process is carried out after the repair of the lower mold of a high manganese steel frog is completed and the floating sand in the cavity is cleaned up.

[0011] Advantages of the present invention compared with the prior art:

[0012] 1. The present invention dries the lower casting cavity by hot air, which can completely dry the thick coating part in a short time, making the thick coating part completely dry and crusty, and reducing the scouring effect of molten steel on the mold during pouring.

[0013] 2. The present invention dries the lower casting cavity by hot air, which can reduce the water content in the thick coating part and the surface layer of the lower mold, making the inner surface layer of the lower mold dry, and reducing the amount of gas generated by the water in the surface layer of the lower mold under the influence of molten steel during pouring.

[0014] 3. The present invention dries the lower casting cavity by hot air. During the drying process, the air pressure in the lower casting cavity increases, which can realize the migration and volatilization of the water in the inner surface layer of the mold to the outer surface layer, reducing the overall water content of the mold.

[0015] 4. The present invention can dry the lower molds of different types of high manganese steel frog through a displaceable movable cover plate, reducing the water content in the molding sand of the lower molds of all types of frogs. It has a simple structure, labor-saving operation, strong adaptability, uniform drying, stable drying quality, energy conservation and environmental protection, and is easy to implement.

[0016] 5. The present invention evenly arranges 1 - 4 hot air pipes to ensure the uniform distribution of hot air inside the mold, avoiding the problems of insufficient local drying or over-drying, significantly improving the drying efficiency, shortening the drying time, having a high heat transfer efficiency, quickly evaporating the water in the cavity, being beneficial to more precisely control the temperature distribution inside the mold, ensuring the stability of the drying quality, avoiding drying quality problems caused by overheating or overcooling, having a consistent drying degree, avoiding quality problems such as cracks and deformations, helping to improve production efficiency, reducing operation difficulty, reducing energy waste, reducing production costs, and improving economic benefits.

[0017] 6. The hot air pipes of the present invention are connected to an electric hot air blower to blow hot air for drying, which is efficient, uniform, has precisely controllable temperature, strong adaptability, energy conservation, environmental protection and no pollution, simple operation, high degree of automation, easy to maintain, and has remarkable energy-saving effects.

[0018] 7. The detachable connection design of the present invention enables the hot air pipes to be replaced individually without replacing the entire movable cover plate, reducing the maintenance cost, improving the economic efficiency of the equipment, being easy to store after disassembly, saving space. In practical applications, by replacing hot air pipes with different specifications or performances, the drying parameters can be flexibly adjusted to meet the drying requirements of different molds, and at the same time, it is convenient for inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a use state diagram of the drying device for the lower mold of high manganese steel frog used in the process of the present invention;

[0020] In the figure: 1 - lower mold of high manganese steel frog, 2 - movable cover plate, 3 - hot air pipe. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will combine with the accompanying drawings in the embodiments of the present invention Figure 1 to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0022] A drying process for the lower casting mold of a high manganese steel frog, (as Figure 1 shown) has a drying device for the lower casting mold of a high manganese steel frog. The device has a movable cover plate 2 covering the upper end surface of the lower casting mold 1 of the high manganese steel frog; the movable cover plate 2 is provided with a hot air pipe 3, and the hot air pipe 3 passes hot air to dry the cavity of the lower casting mold 1 of the high manganese steel frog.

[0023] It should be noted that: by arranging the hot air pipe 3, the hot air is sent into the cavity of the lower casting mold 1 of the high manganese steel frog to realize the circulating flow of the hot air. This design can ensure that every corner inside the casting mold can be evenly heated by the hot air, thereby improving the drying efficiency. The design of the movable cover plate 2 enables the hot air to enter the inside of the casting mold more conveniently, and is also convenient for operation and adjustment. When drying casting molds of different sizes, the cover plate can be moved to adapt to different drying requirements. The temperature of the hot air introduced into the hot air pipe 3 can be precisely controlled as needed, so as to ensure that the casting mold is evenly heated during the drying process and avoid drying quality problems caused by overheating or overcooling. Since the hot air circulates inside the casting mold, it can ensure that the drying degree of each part of the casting mold is the same, avoiding the situation of insufficient local drying or over-drying. The drying device can be equipped with an automatic control system to realize functions such as automatic feeding of hot air, automatic temperature adjustment, and automatic control of drying time, thereby reducing the labor intensity of the operators. The design of the movable cover plate 2 enables the device to adapt to the drying requirements of casting molds of different sizes and shapes. At the same time, the arrangement of the hot air pipe 3 can also be adjusted and optimized according to the actual situation to improve the drying effect. By precisely controlling the temperature and drying time of the hot air, the waste of energy can be minimized and the energy utilization efficiency can be improved. The drying device adopts the hot air drying method and does not need to use chemical agents or other pollutants for emission, meeting the environmental protection requirements.

[0024] In the above embodiments, further: the movable cover plate 2 is evenly provided with 1 to 4 hot air pipes 3.

[0025] It should be noted that: By evenly arranging the hot air pipes 3 on the movable cover plate 2, it can ensure that the hot air is evenly distributed inside the mold, avoiding the problems of insufficient local drying or over-drying. This evenly distributed hot air can significantly improve the drying efficiency and shorten the drying time. The hot air pipes 3 directly heat the inside of the mold, with high heat transfer efficiency, and can quickly evaporate the moisture inside the mold, thus achieving rapid drying. Since the number of hot air pipes 3 is appropriate and evenly distributed, the temperature distribution inside the mold can be controlled more precisely. This precise temperature control helps to ensure the stability of the drying quality and avoid drying quality problems caused by overheating or overcooling. Multiple hot air pipes 3 work simultaneously, ensuring that the drying degree of each part of the mold is the same. This uniform drying effect helps to avoid quality problems such as cracks and deformations inside the mold. Since the number of hot air pipes 3 is appropriate and reasonably distributed, operators can more conveniently adjust and control drying parameters such as hot air temperature and drying time. This simple operation method helps to improve production efficiency and reduce the operation difficulty. By precisely controlling the heating power and drying time of the hot air pipes 3, the waste of energy can be minimized. This efficient energy utilization method helps to reduce production costs and improve economic benefits.

[0026] In the above embodiment, preferably: The hot air pipe 3 is connected to an electric hot air blower to blow hot air for drying.

[0027] It should be noted that: The electric hot air blower can quickly generate hot air and send the hot air into the mold through the hot air pipes 3 to achieve rapid drying. This efficient drying method can significantly shorten the drying time and improve production efficiency. The electric hot air blower is usually equipped with a temperature control system, which can accurately adjust the temperature of the hot air according to needs. This precise temperature control helps to ensure that the mold is evenly heated during the drying process and avoid drying quality problems caused by overheating or overcooling. By adjusting the heating power and hot air temperature of the electric hot air blower, it can meet the drying requirements of molds with different materials and sizes. This strong adaptability makes this drying method have a wide application prospect. The hot air generated by the electric hot air blower can be fully utilized to avoid waste of energy. At the same time, by precisely controlling the temperature and drying time of the hot air, the energy utilization efficiency can be further improved and the production cost can be reduced. Drying with an electric hot air blower meets environmental protection requirements and helps to protect the environment and reduce pollution. The electric hot air blower is usually equipped with an automatic control system, which can realize functions such as automatic feeding of hot air, automatic temperature adjustment, and automatic control of drying time. This highly automated operation method can reduce the labor intensity of operators and improve production efficiency. The structures of the hot air pipes 3 and the electric hot air blower are simple and easy to maintain and repair. This easy-to-maintain feature helps to extend the service life of the equipment and reduce the maintenance cost. By recycling the hot air, the heating power and hot air temperature of the electric hot air blower can be reduced, thereby reducing energy consumption. This significant energy-saving feature makes this drying method have great economic advantages.

[0028] In the above embodiments, further: The hot air duct 3 is detachably connected to the movable cover plate 2.

[0029] It should be noted that: Specifically, a plug-in design or a threaded connection design. The detachable connection design enables the hot air duct 3 to be replaced separately without replacing the entire movable cover plate 2. This reduces the maintenance cost and improves the economic efficiency of the equipment. At the same time, it is easy to store after disassembly, saving storage space. In practical applications, different molds may require different drying temperatures and drying times. By replacing the hot air ducts 3 with different specifications or performances, the drying parameters can be flexibly adjusted to meet the drying requirements of different molds, and it is also convenient for inspection and maintenance.

[0030] In the above embodiments, further: The lower mold 1 of the longer high manganese steel frog is dried in sections and batches by moving the movable cover plate 2.

[0031] By drying in sections and batches, it is possible to avoid energy waste caused by a large amount of heat energy input at one time. At the same time, since the drying time for each section is relatively short, the working load of the electric hot air blower will also be correspondingly reduced, thereby reducing energy consumption and emissions, and at the same time, it can adapt to the drying requirements of different parts. By moving the movable cover plate 2, the size and position of the drying area can be flexibly adjusted to adapt to molds of different lengths. This flexibility makes this drying method have a wide range of application prospects. The operation of drying in sections and batches is relatively simple, and the operator can conveniently adjust the drying parameters and drying sequence according to the actual situation. Since the method of drying in sections and batches is adopted, there is no need to purchase large-scale drying equipment or increase additional drying areas. This helps to reduce the equipment investment cost and improve the economic benefits. The method of drying in sections and batches makes the maintenance of the equipment simpler and more convenient. When a certain part fails or needs maintenance, it can be processed separately without shutting down the entire drying system for maintenance, which helps to reduce the maintenance cost and improve the reliability of the equipment.

[0032] In the above embodiments, further: The hot air temperature for each drying is 100 - 300 °C, and the drying time for each time is 5 - 20 min.

[0033] Example 1: The hot air temperature for each drying is 100 °C, and the drying time for each time is 5 min.

[0034] Example 2: The hot air temperature for each drying is 200 °C, and the drying time for each time is 12 - 13 min.

[0035] Example 3: The hot air temperature for each drying is 300 °C, and the drying time for each time is 20 min.

[0036] Appropriate temperature and time control can ensure that every corner inside the mold is evenly heated, avoiding problems such as insufficient local drying or over-drying, which helps improve the overall quality and performance of the mold. Within this temperature range, the working load of the electric heating blower is moderate, which can reduce energy consumption and emissions. By precisely controlling the hot air temperature and drying time, the thermal energy can be maximally utilized, improving the energy utilization efficiency, helping to reduce production costs and increase economic benefits. Appropriate drying temperature and time can avoid overheating damage to the mold material, protect its physical properties and chemical stability, help extend the service life of the mold, and improve product quality. Drying within this temperature and time range can effectively reduce mold deformation or crack generation, improving the overall performance of the mold.

[0037] In the above embodiment, the drying process is carried out after the repair of the lower mold 1 of the high manganese steel frog is completed and the floating sand in the cavity is cleaned up.

[0038] The working principle of the present invention is as follows: After the repair of the lower mold 1 of the high manganese steel frog is completed and the floating sand in the cavity is cleaned up, the drying process of the lower mold of the high manganese steel frog of the present invention is added. Before drying, the cavity of the lower mold 1 of the high manganese steel frog is covered with a movable cover plate 2. The air inlet end of the hot air pipe 3 is connected to an electric heating blower, and the air outlet end of the hot air pipe 3 is inserted into the reserved hole of the movable cover plate 2. The hot air temperature generated by the electric heating blower is controlled at 100 - 300 °C, and the cavity of the lower mold 1 of the high manganese steel frog is continuously dried at 1 - 4 reserved points on the cover plate for 5 - 20 minutes. While strengthening the circulation of hot dry air inside the lower mold, the water content of the thick coating part and the surface layer of the lower mold sand mold is reduced, thereby reducing the influence of the rapid gasification of the water inside the mold during pouring on the casting, and further ensuring the quality of the mold.

[0039] Through the above description, it can be found that: by drying the lower mold cavity with hot air, the thick coating part can be completely dried within a short time, making the thick coating part completely dry and form a crust, reducing the scouring effect of the molten steel on the mold during pouring.

[0040] By drying the lower mold cavity with hot air, the present invention can reduce the water content of the thick coating part and the surface layer of the lower mold, making the inner surface layer of the lower mold dry, and reducing the amount of gas generated by the water on the surface layer of the lower mold under the influence of the molten steel during pouring.

[0041] By drying the lower mold cavity with hot air, the air pressure inside the lower mold cavity increases during the drying process, which can realize the migration and volatilization of the water on the inner surface layer of the mold to the outer surface layer, reducing the overall water content of the mold.

[0042] The present invention can realize the drying of the lower molds of different models of high manganese steel frogs by displacing the movable cover plate, reducing the water content in the mold sand of the lower molds of all models. It has a simple structure, labor-saving operation, strong adaptability, and is easy to implement.

[0043] It should be understood that although this specification is mainly described according to one embodiment, it does not mean that this embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in this embodiment can also be appropriately arranged and combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high manganese steel frog lower casting mold drying process, characterized in that: A high manganese steel frog lower casting mold drying device is provided, wherein the device comprises a movable cover plate (2) which is arranged on the upper end surface of the high manganese steel frog lower casting mold (1); a hot air pipe (3) is arranged on the movable cover plate (2), and the hot air pipe (3) dries the mold cavity of the high manganese steel frog lower casting mold (1) through hot air.

2. The process according to claim 1, characterized in that: The movable cover plate (2) is evenly provided with 1 to 4 hot air pipes (3).

3. The process according to claim 1 or 2, characterized in that: The hot air pipe (3) is connected to an electric hot air blower to pass hot air for drying.

4. The process according to claim 3, characterized in that: The hot air pipe (3) is detachably connected to the movable cover plate (2).

5. The process according to claim 1, characterized in that: The relatively long high manganese steel frog lower casting mold (1) is dried in sections and batches by moving the movable cover plate (2).

6. The process according to claim 1 or 5, characterized in that: The hot air temperature of each drying is 100-300°C, and the drying time of each drying is 5-20 minutes.

7. The process according to claim 6, characterized in that: The process is carried out after the high manganese steel frog lower casting mold (1) is finished being repaired and the loose sand in the mold cavity is cleaned.

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