A mould for casting ingots of steel with continuous cooling capacity

Abstract

A kind of steel ingot mould for die casting with continuous cooling capacity, including steel ingot mould body, it is characterized in that: the bottom of the mould cavity of the steel ingot mould body is equipped with first cooling pipe, the outer wall of the mould cavity of steel ingot mould body is equipped with second cooling pipe, second cooling pipe inlet is connected with the outlet of first cooling pipe, the inlet of first cooling pipe is connected with cooling liquid supply system, wireless temperature sensor is installed on the side of steel ingot mould body, the bottom of the mould cavity of steel ingot mould body is reserved with the opening hole for facilitating the dismounting of first cooling pipe maintenance.The utility model has the characteristics of simple and reasonable structure, easy to disassemble, good cooling and solidification effect, at the same time, wide applicability, meet the demand of large steel ingot to organization uniformity, and have very important practical significance.

Description

Technical Field

[0001] This utility model belongs to the field of steel ingot mold technology, and relates to a steel ingot mold with continuous cooling capability for die casting. Background Technology

[0002] A steel ingot mold (also known as a casting mold or cast iron ingot mold) is a container used in the iron and steel metallurgy industry to pour and cool molten steel into steel ingots of specific shapes and sizes. Steel ingot molds primarily serve four functions: 1) Shaping: The inner cavity of the steel ingot mold is designed according to the required shape and size of the steel ingot; 2) Cooling and solidification: Cooling is the core function of the steel ingot mold. High-temperature molten steel effectively dissipates heat through the mold wall, allowing heat to be quickly transferred from the molten steel. The solidification sequence generally follows a top-down approach, from the mold wall towards the center, ultimately forming a solid steel ingot; 3) Controlling the solidification process: The structural design of the steel ingot mold (such as wall thickness, inner cavity shape, and taper) directly affects the solidification sequence and quality of the molten steel; 4) Controlling surface quality: The smoothness and stability of the inner surface of the steel ingot mold directly affect the quality of the solidified steel ingot surface. A better mold cavity can greatly reduce defects such as scabs, cracks, and sand adhesion on the steel ingot surface.

[0003] The effectiveness of the ingot mold in cooling and solidifying molten steel directly affects the uniformity of the internal microstructure of the formed ingot. Poor cooling results in a significantly smaller equiaxed crystal region compared to the columnar crystal region at the core. This excessively large columnar crystal region leads to severe elongation and increases the time and difficulty of subsequent homogenization heat treatment and forging. For large steel structural components, the microstructure uniformity of the original large ingot directly impacts the time, difficulty, and cost of manufacturing. Large ingots with better microstructure uniformity significantly reduce the time required for homogenization heat treatment and the number of forging and upsetting cycles, thus mitigating the difficulty of achieving core microstructure uniformity.

[0004] In most steel mills today, the cooling and solidification effect of ingot molds often depends on the structural design of the ingot molds. However, this method is limited by the shape and size of the ingot and the material properties of the ingot mold, making it difficult to meet the cooling and solidification requirements of large ingots with high requirements for microstructure uniformity. As a result, when preparing large steel forgings, the homogenization heat treatment time of large ingots needs to be too long, the internal grains are eventually too large, and during forging, due to insufficient core deformation, it is difficult to achieve the same recrystallization and refinement effect as the outer layer. This easily leads to a situation where the internal grain size of the forging is significantly larger than that of the surface layer, resulting in poor microstructure uniformity of the forging.

[0005] Therefore, designing a steel ingot mold with continuous cooling capability for die casting can well meet the requirements of large steel ingots for uniform microstructure and has very important practical significance. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a steel ingot mold with continuous cooling capacity that is simple in structure, easy to disassemble, and has the characteristics of good cooling and solidification effect and wide applicability.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a steel ingot mold with continuous cooling capability for die casting, comprising a steel ingot mold body, characterized in that: a first cooling pipe is provided at the bottom of the mold cavity of the steel ingot mold body, a second cooling pipe is provided on the outer wall of the mold cavity of the steel ingot mold body, the inlet of the second cooling pipe is connected to the outlet of the first cooling pipe, the inlet of the first cooling pipe is connected to the coolant supply system, a wireless temperature sensor is installed on the side of the steel ingot mold body, and an opening is reserved at the bottom of the mold cavity of the steel ingot mold body to facilitate the maintenance and disassembly of the first cooling pipe.

[0008] As an improvement, the steel ingot mold body is a cubic structure with an open top. The first cooling pipe is arranged in a serpentine coiled manner below the mold cavity of the steel ingot mold body. The outer surface of the part of the first cooling pipe exposed outside the steel ingot mold body is covered with a heat insulation coating.

[0009] Furthermore, the second cooling pipes are arranged in a spiral pattern around the outer wall of the steel ingot mold from bottom to top at a certain interval and angle. The outlet of the second cooling pipe is located at the upper part of the steel ingot mold, and the exposed outer surface of the second cooling pipe is covered with a heat-insulating coating.

[0010] Furthermore, both the first and second cooling pipes have semi-circular cross-sections. The planar side of the first cooling pipe faces upwards as the main cooling surface, while the planar side of the second cooling pipe is in close contact with the outer wall of the steel ingot mold. The arc surface of the second cooling pipe has an insulating coating.

[0011] Furthermore, the coolant supply system includes a liquid nitrogen storage tank, a liquid nitrogen output switch, a vacuum insulated pipe, a flow control valve, and a liquid nitrogen pressurization device. One end of the vacuum insulated pipe is connected to the liquid nitrogen storage tank via the liquid nitrogen output switch. The flow control valve and the liquid nitrogen pressurization device are installed on the vacuum insulated pipe. The other end of the vacuum insulated pipe is connected to the inlet of the first cooling pipe via a pipe connector.

[0012] Furthermore, the liquid nitrogen storage tank is a vertical or horizontal vacuum insulated tank, and both the liquid nitrogen storage tank and the liquid nitrogen output switch are installed outside the workshop.

[0013] Furthermore, there are two wireless temperature sensors, one at the top and one at the bottom, respectively installed on the side wall of the steel ingot mold and at the upper and lower ends of the second cooling pipe.

[0014] Furthermore, two hanging shafts are installed on the outer side of the steel ingot mold body. The two hanging shafts are symmetrically distributed on the upper and lower side walls of the steel ingot mold body, and the hanging shafts are located above the second cooling pipe and below the first cooling pipe, respectively.

[0015] Finally, the four vertical sides of the outer wall of the steel ingot mold body are rounded edges to facilitate the coiling of the second cooling pipe, and the four vertical sides of the inner wall of the mold cavity of the steel ingot mold body are rounded edges.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] 1. A first cooling pipe is provided at the bottom of the mold cavity of the steel ingot mold, and a second cooling pipe is provided on the side wall of the mold cavity. The cooling pipes are connected to the coolant supply system and have continuous cooling capacity through the liquid nitrogen cooling pipes. The steel ingot mold with continuous cooling capacity can quickly remove the heat in the steel ingot mold through liquid nitrogen, so that the heat in the molten steel can be transferred through the steel ingot mold, which greatly reduces the columnar crystal region inside the steel ingot, expands the equiaxed crystal region, refines the internal grain size, and greatly improves the uniformity of the internal structure of the steel ingot.

[0018] 2. A wireless temperature sensor is installed on the surface of the steel ingot mold. The wireless temperature sensor is matched with the flow controller in the coolant supply system, so that the flow controller can control the liquid nitrogen flow based on the electrical signal of the temperature rise and fall of the steel ingot mold wall, thereby realizing the controllability of the continuous cooling capacity of the steel ingot mold.

[0019] 3. The steel ingot mold and coolant supply system can be easily disassembled, facilitating equipment transfer and maintenance;

[0020] This utility model features a simple and reasonable structure, convenient disassembly, and good cooling and solidification effect. It also has wide applicability, meets the requirements of large steel ingots for uniform microstructure, and has very important practical significance. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0022] Figure 2 This is a structural schematic diagram from another angle of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the first cooling pipe;

[0024] Figure 4 This is a schematic diagram of the steel ingot mold.

[0025] Figure 5 yes Figure 4 Side view;

[0026] Figure 6 yes Figure 4 Top view;

[0027] Figure 7 yes Figure 4 A longitudinal sectional view. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figures 1-7 As shown, a steel ingot mold with continuous cooling capability for die casting includes a steel ingot mold body 9 and a coolant supply system. The bottom of the mold cavity of the steel ingot mold body 9 is provided with a first cooling pipe 7, and the outer wall of the mold cavity of the steel ingot mold body 9 is provided with a second cooling pipe 8. The inlet 14 of the second cooling pipe is connected to the outlet 13 of the first cooling pipe, and the inlet 12 of the first cooling pipe is connected to the coolant supply system. A wireless temperature sensor 11 is installed on the side of the steel ingot mold body 9, and an opening 20 is reserved at the bottom of the mold cavity of the steel ingot mold body 9 to facilitate the maintenance and disassembly of the first cooling pipe 7.

[0030] The specific structure is as follows: The coolant supply system includes a liquid nitrogen storage tank 1, a liquid nitrogen output switch 2, a vacuum-insulated pipe 3, a flow control valve 4, and a liquid nitrogen pressurization device 5. One end of the vacuum-insulated pipe 3 is connected to the liquid nitrogen storage tank 1 via the liquid nitrogen output switch 2. The function of the liquid nitrogen output switch 2 is mainly to control the terminal output of liquid nitrogen from the liquid nitrogen storage tank 1. The flow control valve 4 and the liquid nitrogen pressurization device 5 are installed on the vacuum-insulated pipe 3. The other end of the vacuum-insulated pipe 3 is connected to the inlet 12 of the first cooling pipe via a pipe connector 6. The liquid nitrogen storage tank 1 is a vertical or horizontal vacuum-insulated tank. Both the liquid nitrogen storage tank 1 and the liquid nitrogen output switch 2 are installed outside the workshop to reduce safety risks. The vacuum-insulated pipe 3 is a circular cross-section pipe used between the liquid nitrogen storage tank 1 and the cooling station. It can effectively ensure that the liquid nitrogen is not lost during the liquid nitrogen transportation process. The flow control valve 4 controls the liquid nitrogen flow rate according to the temperature change of the steel ingot mold, thereby achieving real-time temperature control of the steel ingot mold. The liquid nitrogen pressurization device 5 transforms the low-speed, low-pressure liquid nitrogen regulated by the flow control valve 4 into high-speed, high-pressure liquid nitrogen through pressurization, ensuring that the liquid nitrogen has sufficient kinetic energy to overcome potential energy and complete the flow of liquid nitrogen in the first cooling pipe 7 and the second cooling pipe 8, thereby cooling the steel ingot mold 9. The pipe connector 6 serves to connect or disconnect the vacuum insulated pipe 3 from the first cooling pipe 7, facilitating the hoisting, transfer, and demolding of the steel ingot mold after the molten steel has solidified.

[0031] The ingot mold 9 is a cubic structure with an open top. The first cooling pipe 7 is arranged in a serpentine coil below the mold cavity of the ingot mold 9. In this embodiment, the first cooling pipe 7 is a serpentine pipe with four bends. Slots are provided on the front and rear sides of the lower part of the ingot mold for inserting the bent ends of the first cooling pipe 7. The first cooling pipe 7 is positioned by inserting its bent ends into the slots. The outer surface of the portion of the first cooling pipe 7 exposed outside the ingot mold 9 has an insulating coating to reduce nitrogen consumption. The second cooling pipe 8 is arranged at a certain interval and angle, coiled around the outer wall of the ingot mold 9 from bottom to top. The outlet of the second cooling pipe 8 is located at the upper part of the ingot mold 9, and liquid nitrogen is ultimately discharged as nitrogen gas from the outlet 15 of the second cooling pipe. The exposed outer surface of the second cooling pipe 8 also has an insulating coating to reduce nitrogen consumption.

[0032] In this embodiment, the cross-sections of the first cooling pipe 7 and the second cooling pipe 8 are both semi-circular. The planar side of the first cooling pipe 7 is set upward as the main cooling surface, so that the first cooling pipe can uniformly cool the bottom of the steel ingot mold cavity in a planar form. The planar side of the second cooling pipe 8 is tightly wrapped around the outer wall of the steel ingot mold 1 to ensure uniform cooling of the surface of the steel ingot mold 1. The arc surface of the second cooling pipe 8 is exposed and has an insulating coating.

[0033] There are two wireless temperature sensors 11, one at the top and one at the bottom, installed on the side wall of the ingot mold 9 and at the top and bottom of the second cooling pipe 8, respectively. By sending electromagnetic signals of the bottom and top temperatures of the ingot mold 9 to the flow control valve 4, the flow rate of liquid nitrogen is increased or decreased according to the actual temperature rise of the ingot mold wall 18 by the molten steel, so as to achieve precise temperature control.

[0034] A lifting shaft 10 is installed on the outside of the steel ingot mold body 9 to facilitate the lifting and demolding operation of the steel ingot mold body 9. There are two lifting shafts 10, one above the other, which are symmetrically distributed on the upper and lower side walls of the steel ingot mold body 9, and the lifting shafts 10 are located above the second cooling pipe 8 and below the first cooling pipe 7, respectively.

[0035] The outer wall of the ingot mold 1 has rounded corners 16 on all four vertical sides, which facilitates the coiling of the second cooling pipe 8 and allows liquid nitrogen to flow more easily within it. The inner wall of the ingot mold 9 has rounded corners 17 on all four vertical sides. These rounded corners 17 reduce stress concentration on the surface of the ingot and allow for uniform cooling of the mold wall 18 throughout. The opening 20 at the bottom of the mold cavity of the ingot mold 9 is a semi-circular hole, which facilitates the maintenance, disassembly, and replacement of the first cooling pipe 7.

[0036] In this embodiment, the ingot mold is equipped with continuous cooling capability through a liquid nitrogen cooling pipe. Previously, ingot molds relied primarily on their own steel body for heat conduction, resulting in limited cooling of the molten steel. This led to an excessively large columnar crystal region in the core of the ingot after solidification, severely impacting subsequent heat treatment and processing. However, the ingot mold with continuous cooling capability can rapidly remove heat from the mold using liquid nitrogen, allowing heat transfer from the molten steel to the mold. This significantly reduces the columnar crystal region within the ingot, expands the equiaxed crystal region, refines the internal grain size, and greatly improves the uniformity of the ingot's internal structure.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A steel ingot mold for die casting with continuous cooling capability, comprising a steel ingot mold body, characterized in that: The bottom of the mold cavity of the steel ingot mold is provided with a first cooling pipe, and the outer wall of the mold cavity of the steel ingot mold is provided with a second cooling pipe. The inlet of the second cooling pipe is connected to the outlet of the first cooling pipe, and the inlet of the first cooling pipe is connected to the coolant supply system. A wireless temperature sensor is installed on the side of the steel ingot mold, and an opening is reserved at the bottom of the mold cavity of the steel ingot mold to facilitate the maintenance and disassembly of the first cooling pipe.

2. The steel ingot mold according to claim 1, characterized in that: The steel ingot mold body is a cubic structure with an open top. The first cooling pipe is arranged in a serpentine coil below the mold cavity of the steel ingot mold body. The outer surface of the part of the first cooling pipe exposed outside the steel ingot mold body is covered with a heat insulation coating.

3. The steel ingot mold according to claim 2, characterized in that: The second cooling pipes are arranged in a spiral pattern around the outer wall of the steel ingot mold from bottom to top at a certain interval and angle. The outlet of the second cooling pipe is located at the upper part of the steel ingot mold, and the exposed outer surface of the second cooling pipe is covered with a heat insulation coating.

4. The steel ingot mold according to claim 3, characterized in that: The first cooling pipe and the second cooling pipe both have semi-circular cross-sections. The flat side of the first cooling pipe is set upwards as the main cooling surface, and the flat side of the second cooling pipe is in close contact with the outer wall of the steel ingot mold. The arc surface of the second cooling pipe has an insulating coating.

5. The steel ingot mold according to claim 4, characterized in that: The coolant supply system includes a liquid nitrogen storage tank, a liquid nitrogen output switch, a vacuum insulated pipe, a flow control valve, and a liquid nitrogen pressurization device. One end of the vacuum insulated pipe is connected to the liquid nitrogen storage tank through the liquid nitrogen output switch. The flow control valve and the liquid nitrogen pressurization device are installed on the vacuum insulated pipe. The other end of the vacuum insulated pipe is connected to the inlet of the first cooling pipe through a pipe connector.

6. The steel ingot mold according to claim 5, characterized in that: The liquid nitrogen storage tank is a vertical or horizontal vacuum insulated tank, and both the liquid nitrogen storage tank and the liquid nitrogen output switch are installed outside the workshop.

7. The steel ingot mold according to any one of claims 1 to 6, characterized in that: The wireless temperature sensor consists of two units, one at the top and one at the bottom, which are respectively installed on the side wall of the steel ingot mold and at the upper and lower ends of the second cooling pipe.

8. The steel ingot mold according to any one of claims 1 to 6, characterized in that: The steel ingot mold body is equipped with two hanging shafts, one above the other, which are symmetrically distributed on the upper and lower side walls of the steel ingot mold body, and the hanging shafts are located above the second cooling pipe and below the first cooling pipe, respectively.

9. The steel ingot mold according to any one of claims 1 to 6, characterized in that: The four vertical sides of the outer wall of the steel ingot mold are rounded edges to facilitate the coiling of the second cooling pipe, and the four vertical sides of the inner wall of the mold cavity of the steel ingot mold are rounded edges.

Images