A nano-hub casting production line and a cast steel preparation method thereof

Abstract

A kind of nanometer hub casting production line and its cast steel preparation method, belong to hub field.The production line includes multiple intermediate frequency furnaces arranged before clarifying tank, the inside of pool wall before clarifying tank furnace is inclined structure, conveying belt is arranged before clarifying tank discharge of steelmaking furnace, multiple hub manufacturing molds are arranged on conveying belt, mold is inner mold of fusible material, ceramic shell formed by refractory clay after drying is coated on the periphery of inner mold, the components of casting are:Cr0.5~0.8%, Mn0.55~0.8%, C0.15~0.2%, Ni0.03~0.05%, Nb0.01~0.03%, Al0.03~0.06%, Cu0.06~0.1%, Co0.02~0.05%, P+S+Ca≤0.03, Mo+W+V+Ti+Sc+Sn≤0.02, the balance is Fe, except Fe, all are nanometer material, the present application adopts nanometer raw material, special mold, can shorten melting time, change casting mode, improve hub strength, prevent environmental pollution.

Description

TECHNICAL FIELD

[0001] The application relates to an iron alloy wheel hub, in particular to a nano wheel hub casting production line and a steel casting preparation method thereof, and belongs to the wheel hub field. BACKGROUND

[0002] The wheel hub of a vehicle is a rotating part for installing an axle end, is a metal ring for supporting and fixing a tire and rotating together with the tire, buffers external impact, realizes contact between the tire and a road surface, and guarantees driving performance of the vehicle. The automobile wheel hub comprises a wheel rim arranged at an inner periphery of the tire, a wheel core arranged at the axle end and rotating through a bearing, and the wheel core is supported between the wheel rim through spokes, the wheel hub is a rotating metal part for supporting the wheel rim and the wheel core, and the wheel hub is also called a wheel ring, a steel ring, a hub, and a tire ring. The wheel hub comprises a wheel hub formed through plate rolling and stamping and a wheel hub formed through a casting method, the wheel hub formed through plate rolling and stamping has many processes and high processing difficulty, compared with prefabrication, the casting wheel hub is formed through molten iron liquid and a mold, has few intermediate processing links, and has low cost. In recent years, with continuous development of the manufacturing industry, the wheel hub develops towards the direction of tubeless, and the vehicle has a load, especially a load truck, and deformation often occurs, main reasons are as follows: 1, insufficient strength of the wheel hub, 2, the tire continues to run when the tire is deflated or the tire pressure is low, 3, the tire or the wheel hub collides with a relatively hard object, and 4, the tire cannot completely buffer the impact force, and part of the force reaches the wheel hub.

[0003] The nano material can improve the strength of the casting, application number CN99802918.1 discloses a lost foam mold and a manufacturing method, the method is that a slurry formed by coating a refractory material on the periphery of a thermoplastic material is dried to form a ceramic shell mold, after pouring, the inner mold is melted, and after the shell mold of the ceramic product used in the periphery is removed, the casting product is formed. The method can avoid making a sand mold, reduce pollution, and recycle the ceramic shell mold, in order to avoid deformation of the wheel hub and improve load strength of the wheel hub, new wheel hub materials need to be researched and developed. SUMMARY

[0004] In view of the fact that the existing wheel hub is prone to deformation under load and external force, according to strength requirements of the wheel hub and simulation software calculation of iron raw materials and other metal raw materials, an optimized wheel hub casting formula is obtained through actual melting and testing, and a melting production line matched with the formula is designed, the application provides a nano wheel hub casting production line and a steel casting preparation method thereof, the purpose is to adopt nano raw materials and special molds, shorten manufacturing time, change a casting method, improve strength of the casting wheel hub, and prevent environmental pollution.

[0005] The technical scheme of the present application is: a kind of nanometer hub casting production line, including batching equipment, intermediate frequency furnace, the intermediate frequency furnace includes multiple, multiple intermediate frequency furnace is arranged in steelmaking furnace clarifier before, using multiple intermediate frequency furnace smelting after molten iron flows into steelmaking furnace clarifier 22 and keeps warm clarification, the inner side of pool wall before clarifier of steelmaking furnace clarifier is inclined structure, mould conveying belt is set before the discharge port of clarifier of steelmaking furnace clarifier, multiple hub manufacturing molds are set on conveying belt according to same interval, intermediate frequency furnace outlet and steelmaking clarifier discharge port are provided with electric gate, the electronic scale and inclined pouring mechanism are set on pouring ladle below clarifier discharge port, after weighing, inclined pouring mechanism rotates pouring ladle and pours after inclination to mould, then cooling, disassembly, the mould is the ceramic shell formed after the outer periphery of inner mould of fusible material is coated with refractory material,

[0006] The thickness of the upper layer of refractory bricks of the inclined structure pool wall towards the direction of the clarifier is greater than the thickness of the lower layer of refractory bricks, and the thickness of the refractory bricks constituting the inclined structure pool wall towards the direction of the clarifier is greater on the upper surface than on the lower surface. The outer side of the pool wall on one side of the furnace front is a vertical pool wall, and the inner side towards the steelmaking clarifier is an inclined structure pool wall. A groove and a through hole are provided in the refractory bricks in the height direction at the end of the furnace front. The through hole is provided with a counterbore at both ends.

[0007] Further, a feeding port is provided above the intermediate frequency furnace, which includes a feeding port for nanometer powder and a feeding port for iron raw material. A discharge port is provided below the intermediate frequency furnace. A screw feeder is provided in front of the feeding port for nanometer powder. An inclined discharge channel is connected to the discharge port. The inclined discharge channel is connected to the inner side of the front wall of the steelmaking furnace clarifier and is located above the inclined structure pool wall.

[0008] Further, an iron raw material feeding port and a nanometer powder feeding port are provided above the intermediate frequency furnace. A nanometer powder weighing and batching system and a mixing system are provided in front of the nanometer powder feeding port.

[0009] Further, the mould is an inner mould made of fusible material. An environmentally friendly refractory mortar is coated on the outer part of the inner mould to form a ceramic shell mould after drying. The inner mould is consistent with the shape of the product. A pouring port is left on the ceramic shell mould, and a ember outlet is provided below. The molten metal melts the inner mould to form a hub product.

[0010] Further, a threaded rod is provided in the through hole of the refractory brick. A hole pressing plate is provided in the groove. The threaded rod includes a screw rod, and a nut is provided at the upper end of the screw rod. The hole pressing plate is pressed below the nut. Each refractory brick corresponds to a threaded rod. The threaded rod of the upper layer of refractory bricks is screwed to the nut at the upper end of the lower threaded rod. A steel structure is provided around the pool wall in front of the steelmaking furnace clarifier. The upper and lower ends of the pressing rod formed by the multiple threaded rods are fixed to the upper and lower steel structures.

[0011] A method for preparing a nano-wheel hub cast steel by using a nano-wheel hub casting production line as claimed in any one of the preceding claims, wherein the nano-wheel hub cast steel comprises Cr 0.5-0.8%, Mn 0.55-0.8%, C 0.15-0.2%, Ni 0.03-0.05%, Nb 0.01-0.02%, Al 0.03-0.06%, Cu 0.06-0.1%, Co 0.02-0.05%, P+S+Ca≤0.03%, Mo+W+V+Ti+Sc+Sn≤0.02%, and the balance of Fe, wherein the nano-wheel hub cast steel is prepared by mixing and smelting the nano-powder and Fe raw material in a medium frequency furnace, and then flowing into a large clarifying tank for clarification, and the nano-wheel hub cast steel is used for wheel hub production, and wherein the nano-powder is added first and heated to a temperature of 500°C, and then the Fe raw material is added and heated to a temperature of 1470°C.

[0012] 1) the nano-powder is added first and heated to a temperature of 500°C;

[0013] 2) the Fe raw material is added and heated to a temperature of 1470°C;

[0014] 3) the molten metal is flowed into a clarifying tank of a steelmaking furnace, and the temperature of the molten metal in the clarifying tank of the steelmaking furnace is maintained at 1350-1450°C;

[0015] 4) pouring is performed at a temperature of 1350-1400°C;

[0016] Further, the nano-wheel hub cast steel comprises Cr 0.55-0.7%, Mn 0.6-0.8%, C 0.13-0.15%, Ni 0.025-0.04%, Nb 0.01-0.02%, Al 0.04-0.055%, Cu 0.07-0.09%, Co 0.02-0.04%, P+S+Ca≤0.025%, Mo+W+V+Ti+Sc+Sn≤0.015%, and the balance of Fe.

[0017] The present application has the positive effect that: by using the intermediate frequency furnace for the steel smelting furnace, using the nanometer raw material powder in the steel smelting furnace, by using the nanometer raw material powder, the smelting time can be reduced, the nanometer powder can be made into the iron raw material in a short time, by using the intermediate frequency furnace, the flying of the nanometer raw material can be prevented, if the traditional steel smelting furnace is directly used, the nanometer raw material can be sucked away or become smoke under the action of the chimney, it is difficult to guarantee the component ratio of the raw material, the design purpose cannot be reached, by using the melting of multiple intermediate frequency furnaces, not only the nanometer raw material can be prevented from being sucked away, but also the melting time can be shortened, the melting quality can be guaranteed, and the material strength can be improved; by setting the iron raw material and the nanometer principle inlet on the intermediate frequency furnace, the special material and mixing system can be used for mixing the nanometer raw material, the iron raw material is large in material and high in material consumption, the special feeding port is used for feeding first, the nanometer raw material feeding is not excessive flying; a large clarifying tank is arranged after the intermediate frequency furnace, the melting temperature of the molten liquid can be further unified in the flowing process in the clarifying tank, the bubbles generated in the raw material melting process can be further reduced, the density of the casting can be improved, the sand eyes generated by the bubbles in the casting can be eliminated, the number of the settings such as the cold iron in the mold can be reduced, the metal liquid flowing into the clarifying tank is designed as an inclined structure on one side of the clarifying tank, the erosion of the metal liquid flow to the inner side of the furnace front tank wall during feeding can be prevented, the inner side of the clarifying tank furnace front tank wall is an inclined structure tank wall, the excessive doping of the refractory bricks into the metal liquid can be prevented, the purity of the metal liquid can be guaranteed, the refractory material entering the metal liquid can be prevented, the quality of the casting can be prevented, the strength of the casting can be reduced, especially the refractory bricks are arranged as the upper layer thickness greater than the lower layer thickness, which is beneficial to the inclination of the inner wall, in order to prevent the furnace front tank wall from tilting inwardly due to the weight of the upper part, a groove or a through hole in the height direction is arranged on the refractory brick on one side of the furnace front, the refractory brick front end is pressed by using the threaded rod and the hole pressing plate, the inward tilting of the furnace front tank wall can be prevented; by setting the gate plate on the clarifying tank discharge, the weight of the metal liquid flowing into the pouring ladle can be controlled by using the controller, the metal liquid in one pouring ladle can be guaranteed to be poured into the mold, the excessive or insufficient liquid can be prevented, the waste of the excessive metal liquid or the insufficient metal liquid can be avoided, the stratification phenomenon in the casting after multiple pouring can be prevented, and the quality of the casting is affected;The wax, foam plastic stool and the meltable material are melted by the molten metal liquid to form a metal casting with very beautiful appearance in the ceramic shell, the ceramic shell formed by using the refractory clay can be reused after being crushed, and the environmental pollution caused by the sand casting in the prior art is avoided, so that a new revolution is brought to the casting technology, the melting time is reduced, the melting quality is improved, the sand eyes in the casting are reduced, the scattering of the nano material is prevented by using the intermediate frequency furnace and the refractory brick clarifying tank, the consistency of the iron alloy composition in the casting with the design is ensured, the consistency of the composition is ensured, the product quality is improved, and the product quality is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The cross-sectional structure of the clarifying tank 22 of the steel smelting furnace provided with multiple intermediate frequency furnaces is shown in a schematic view.

[0019] Figure 2 The structure of the clarifying tank furnace front pool wall is shown in a schematic view. Figure One .

[0020] Figure 3 The structure of the clarifying tank furnace front pool wall is shown in a schematic view. Figure Two .

[0021] Figure 4 The structure of the threaded rod is shown in a schematic view.

[0022] Label explanation: 10-iron raw material feeding port, 11-mixed nano powder conveying pipeline, 12-nano powder furnace front stock bin, 13-iron raw material stock bin, 14-spiral feeder, 15-intermediate frequency furnace, 16-electric gate valve one, 17-inclined pool wall structure, 18-pressing rod, 19-batching plant roof steel structure, 20-pool top steel structure, 21-pool bottom steel structure, 22-clarifying tank, 22a-metal liquid, 23-electric gate valve two, 24-electric scale, 25-inclined pouring mechanism, 26-pouring ladle, 27-mold, 28-conveying belt, 29-pool bottom support steel structure, 30-refractory brick, 31-inclined surface, 32-groove, 33-through hole, 34a-circular counterbore, 34b-hexagonal counterbore, 35-threaded rod, 36-screw rod, 37-rod end nut, 38-internal thread. DETAILED DESCRIPTION

[0023] The specific technical solutions of the present application will be described in detail below with reference to the accompanying drawings.

[0024] The technical solution of the present application is: a nano iron alloy hub manufacturing production line, which comprises a batching device, an intermediate frequency furnace 15, Figure 1This is a cross-sectional structural diagram of a steelmaking furnace clarification tank 22 equipped with multiple intermediate frequency furnaces 15. Each intermediate frequency furnace 15 has a nano-powder furnace front silo 12 and an iron raw material silo 13 respectively positioned above it. The iron raw material silo 13 has an iron raw material feeding port 10, and a weighing and feeding system is located above the iron raw material feeding port 10. A nano-powder mixing conveying pipe 11 is connected to the nano-powder furnace front silo 12, and a nano-powder mixing system is connected before the nano-powder conveying pipe 11. The nano-powder furnace front silo 12 is connected via a propeller. The feeder 14 is connected to multiple intermediate frequency furnaces 15, which are located above and in front of the steelmaking furnace clarification pool 22. The molten iron smelted by the multiple intermediate frequency furnaces 15 flows into the steelmaking furnace clarification pool 22 for heat preservation and clarification. The inner side of the furnace wall of the steelmaking furnace clarification pool 22 is inclined. A mold 27 and a conveyor belt 28 are set in front of the discharge port of the steelmaking furnace clarification pool 22. Multiple hub manufacturing molds 27 are set on the conveyor belt 28 at the same interval. Electric gate 16 or electric gate 23 are set at the outlet of the intermediate frequency furnace 15 and the discharge port of the steelmaking furnace clarification pool 22, respectively. A casting ladle 26 is set below the discharge port of the steelmaking furnace clarification pool 22. An electronic scale 24 and an inclined casting mechanism 25 are set on the casting ladle 26. After weighing, the inclined casting mechanism 25 rotates the casting ladle 26 and tilts it to pour into the mold 27. Then, cooling and demolding are performed.

[0025] Figure 2 This is a schematic diagram of the refractory brick structure used for the clarifier pool wall in front of furnace 22. Figure One . Figure 3 This is a schematic diagram of the refractory brick structure used for the clarifier pool wall in front of furnace 22. Figure Two The steelmaking furnace clarification tank 22, the medium-frequency furnace 15, the nano-powder furnace front silo 12, and the iron raw material silo 13 are all supported by steel structures, including the steel structure 19 for the batching plant roof, the steel structure 20 for the tank roof, the steel structure 21 for the tank bottom, and the steel structure 29 for the tank bottom support. A feeding port is provided above the medium-frequency furnace 15, including a feeding port from the nano-powder furnace front silo 12 and a feeding port from the iron raw material silo 13. A discharge port is provided below the medium-frequency furnace 15. A screw feeder 14 is provided in front of the feeding port of the nano-powder furnace front silo 12. The screw feeder 14 is located in front of the nano-powder furnace front silo 12. An inclined discharge channel is connected to the discharge port. An electric gate 16 is equipped on the inclined discharge channel of the medium-frequency furnace 15. The inclined discharge channel is connected to the front wall of the steelmaking furnace clarification tank 22 and is located above the inclined structure tank wall. The clarification tank 22 heats the molten metal, which eliminates air bubbles in the liquid as it flows toward the outlet, thus achieving the purpose of clarification.

[0026] The thickness of the upper layer of pool wall firebricks 17 of the inclined structure pool wall towards the direction of the clarifying pool 22 is greater than the thickness of the lower layer of pool wall firebricks 30, the thickness of the pool wall firebricks 17 of the inclined structure pool wall towards the direction of the clarifying pool 22 is greater than the thickness of the lower layer, the outer side of the pool wall at the front of the furnace is a vertical pool wall, the inner side of the pool wall towards the clarifying pool 22 of the steelmaking is the inclined structure pool wall 17, the pool wall firebricks 17 at the front of the furnace are provided with grooves 32 and through holes 33 in the height direction, the through holes 33 are provided with counterbores at both ends, in the embodiment, the upper end face of the through hole is a circular counterbore 34a, the lower end face of the through hole is a hexagonal counterbore 34b, the surface area of the hexagonal counterbore 34b is greater than or equal to the surface area of the hexagonal nut, and the depth of the hexagonal counterbore 34b is greater than or equal to the height of the hexagonal nut.

[0027] The medium frequency furnace 15 is provided above with an iron raw material feeding port and a nano powder feeding port, the nano powder feeding port is provided in front with a nano powder weighing and batching system and a mixing system.

[0028] The mold 27 is an inner mold made of a fusible material, the outer part of the inner mold is coated with an environmentally friendly refractory mortar, and a ceramic shell mold is formed after drying, the inner mold is consistent with the shape of the product, the ceramic shell mold has a pouring port and a ember outlet below, and the molten metal liquid 22a forms a hub product after melting the inner mold.

[0029] In the embodiment, a foamed plastic inner mold is used, the foamed plastic inner mold is obtained by using a mold, the mold of foamed plastic is made of aluminum alloy, the aluminum alloy mold is easy to process and has good surface finish, the shape of the aluminum alloy mold is consistent with the shape of the cast product, the size of the product can be inspected before pouring, and the foamed plastic inner mold can be obtained very well, the outer surface of the foamed plastic inner mold is coated with an environmentally friendly refractory mortar before pouring, and a hard ceramic shell is obtained after drying, the shell can be knocked off from the periphery of the casting, the shell after demolding can be crushed for recycling, and is a renewable material and an environmentally friendly and sustainable material.

[0030] Figure 4The schematic structure diagram of the threaded rod is shown in the figure. The threaded rod 35 is arranged in the through hole 33 of the pool wall firebrick 17, a hole pressing plate is arranged in the groove 32, the threaded rod 35 comprises a screw rod 36, a nut 37 is arranged at the upper end of the screw rod 36, the hole pressing plate is pressed below the nut 37, the height of the nut 37 is higher than the height of the hole pressing plate, the upper surface of the hole pressing plate is in the same plane with the upper surface of the pool wall firebrick 17, the nut 37 is just located in the lower surface hexagonal hole 34b of the upper pool wall firebrick 17, of course, the hexagonal hole 34b can be a circular hole which can be inserted into the nut 37, each pool wall firebrick 17 corresponds to a threaded rod 35, the threaded rod 35 of the upper pool wall firebrick 17 is screwed at the inner thread 38 of the nut 37 at the upper end of the lower threaded rod 35, the steel structure is arranged at the front of the pool wall of the steel refining furnace, and the upper and lower ends of the compression rod 18 formed by the multilayer threaded rod 35 are fixed on the upper and lower steel structures

[0031] A method for preparing a nano-wheel hub cast steel by using the nano-iron alloy wheel hub manufacturing production line in any one of the above-mentioned methods, the components of the nano-wheel hub cast steel are as follows: Cr 0.5-0.8%, Mn 0.55-0.8%, C 0.15-0.2%, Ni 0.03-0.05%, Nb 0.01-0.03%, Al 0.03-0.06%, Cu 0.06-0.1%, Co 0.02-0.05%, P+S+Ca≤0.03%, Mo+W+V+Ti+Sc+Sn≤0.02%, and the balance is Fe, wherein, except the Fe raw material, the rest components are nano-powder, after mixing and smelting in a medium frequency furnace, the mixture is flowed into a large clarifying tank for clarification, and is used for wheel hub production.

[0032] 1) first, the nano-powder is added, and heated to 500°C;

[0033] 2) then, the Fe raw material is added, and heated to 1470°C;

[0034] 3) the molten metal is flowed into a steel refining furnace clarifying tank, and the temperature of the molten metal in the steel refining furnace clarifying tank is kept at 1350°C-1450°C;

[0035] 4) pouring is implemented at a temperature of 1350°C-1400°C;

[0036] In the present application, the content of Cr is 0.5-0.8%, which can form a metallographic structure of pearlite or pearlite framework ferrite, is beneficial to improve the toughness and fatigue performance of the castings, has the functions of stabilizing carbide and hindering graphitization, and is also beneficial to the processing of the castings.

[0037] In the present invention, the content of Mn is 0.55-0.8%, which can play the role of alloy, fully play the role of stabilizing carbide and pearlite. If the amount of manganese is too high, it can promote the formation and refinement of pearlite, or increase the strength and hardness of the casting. On the contrary, it reduces plasticity and toughness. In the present invention, the proportion of 0.55-0.8% is a compromise between strength, hardness and reduction of plasticity and toughness.

[0038] In the present invention, the content of C is designed to be 0.15-0.2%. If the content of C in the casting is too high, the tensile strength and yield strength will increase, which will not be beneficial to the anti-jolt performance on the road.

[0039] In the present invention, the content of Ni is 0.03-0.04%, which can form very fine pearlite. If the content of Ni is too high, it will increase the hardness, but will reduce the toughness and plasticity. The range of 0.03-0.04% can meet the demand of the wheel hub.

[0040] In the present invention, Al, Cu and Co can ensure the increase of spheroidization rate. Proper addition of Al can improve its corrosion resistance. If Cu is too high, it will affect the spheroidization effect, the spheroidization rate will decrease sharply, the number of balls will decrease sharply, and even the appearance of massive graphite will occur. Sometimes the graphite will gradually change from spherical to massive. The addition of a small amount of Mo can refine the pearlite and also refine the graphite. W can stabilize the carbonization and hinder the graphitization, which can moderate the effect of stable carbide.

[0041] Other element contents are not described in detail here.

[0042] Examples, evaluation data and evaluation results

[0043]

[0044] In the above formula, the formula is optimized as follows: Cr 0.55-0.7%, Mn 0.6-0.8%, C 0.16-0.18%, Ni 0.03-0.04%, Nb 0.01-0.02%, Al 0.04-0.055%, Cu 0.07-0.09%, Co 0.02-0.04%, P+S+Ca≤0.025%, Mo+W+V+Ti+Sc+Sn≤0.015%, the balance being Fe.

[0045] 1) First, add nano powder, heat to 500°C;

[0046] 2) Then add Fe raw material, heat to 1470°C;

[0047] 3) Flow the molten metal into the clarifying tank of the steelmaking furnace, and the temperature of the molten metal in the clarifying tank of the steelmaking furnace is kept at 1350°C-1450°C;

[0048] 4) the casting is performed at a temperature of 1350°C - 1400°C;

[0049] The implementation of the optimization scheme is as follows:

[0050] At the same time, the products were subjected to stress deformation tests, the results of which are as follows:

[0051]

[0052] At the same time, the products were subjected to stress deformation tests, the results of which are as follows:

[0053] Stress deformation curve

[0054]

[0055] The present application adopts the intermediate frequency furnace 15 for the steel smelting furnace, adopts the nanometer raw material powder in the steel smelting furnace, can reduce the smelting time through the nanometer raw material powder, can make the nanometer powder into the iron raw material in a short time, can prevent the flying of the nanometer raw material through the use of the intermediate frequency furnace 15, if directly using the traditional steel smelting furnace, can be drawn away or become flue gas under the action of the chimney, it is difficult to guarantee the component proportion of the raw material, cannot reach the design purpose, through the smelting of multiple intermediate frequency furnaces 15, not only can guarantee that the nanometer raw material will not be sucked away, but also can shorten the melting time, guarantee the smelting quality, improve the material strength, through the iron raw material and the nanometer principle entrance arranged on the intermediate frequency furnace 15, the nanometer raw material can be mixed by using the special batching and mixing system, the iron raw material is large in material and high in material consumption, the special feeding port is used for feeding first, the nanometer raw material feeding will not be excessive flying, a large clarifying tank 22 is arranged after the intermediate frequency furnace 15, the molten liquid can be further unified in the flowing process in the clarifying tank 22, and the bubbles generated in the raw material melting process can be further reduced, the density of the casting can be improved, the sand eyes generated by the bubbles in the casting can be eliminated, the number of settings such as cold iron in the mold 27 can be reduced, the inner side of the inclined structure pool wall 17 is designed into an inclined structure on the side of the clarifying tank 22 in the steel smelting, the inclined structure is composed of multiple inclined surfaces 31 of refractory bricks, the molten metal liquid 22a in the clarifying tank 22 can be prevented from flowing into the metal liquid 22a in the clarifying tank 22, the erosion of the metal liquid 22a to the inner side of the pool wall in front of the furnace can be prevented, the inner side of the clarifying tank 22 in front of the furnace is the inclined structure pool wall 17, the composition of the pool wall refractory brick 17 can be prevented from being excessively doped into the metal liquid 22a, the purity of the metal liquid 22a can be guaranteed, the influence of the refractory material entering the metal liquid 22a on the quality of the casting can be prevented, the strength of the casting is reduced, especially the pool wall refractory brick 17 is involved into the upper layer with the thickness greater than that of the lower layer, which is beneficial to the inclination of the inner wall, in order to prevent the front pool wall of the furnace from tilting inward due to the weight of the upper part, the height direction groove 32 or through hole 33 is arranged on the pool wall refractory brick 17 on the side of the furnace front, the front end of the pool wall refractory brick is pressed by using the threaded rod 35 and the hole pressing plate, so that the inward tilting of the front pool wall of the furnace can be prevented; a gate is arranged on the discharge of the clarifying tank 22, the weight of the metal liquid 22a flowing into the pouring ladle 26 can be controlled by using the controller, the metal liquid 22a in a pouring ladle 26 can be guaranteed to be poured into the mold 27, the excessive or insufficient liquid can be prevented, the waste of excessive metal liquid or insufficient metal liquid can be avoided, the stratification phenomenon in the casting after multiple pouring can be prevented, and the quality of the casting is affected.By using the inside mould made of fusible material inside the mould 27, the wax, foam plastic stool fusible material can be melted by the molten metal liquid 22a, and the metal casting with very beautiful appearance can be formed inside the ceramic shell, and by using the ceramic shell formed by the refractory clay, not only the used shell can be crushed and reused, but also the environmental pollution caused by the sanding of the prior art is avoided, and a new revolution is brought to the casting technology, and by adopting the nanoscale material, the melting time can be reduced, the melting quality can be improved, the sand hole in the casting can be reduced, the nanoscale material scattering phenomenon can be prevented by adopting the intermediate frequency furnace 15 cooperating with the pool wall refractory brick clarifying pool 22, the consistency of the ferroalloy composition in the casting with the design is ensured, the consistency of the composition is ensured, the product quality is improved, and the product quality is ensured.

Claims

1. A nanohub casting production line comprising a batching plant, a medium frequency furnace, characterized in that: The intermediate frequency furnace comprises a plurality of intermediate frequency furnaces arranged in front of a steelmaking furnace clarifying tank, and the molten iron after smelting by the plurality of intermediate frequency furnaces flows into the steelmaking furnace clarifying tank for heat preservation and clarification, the inner side of the pool wall in front of the steelmaking furnace clarifying tank tank is of an inclined structure, a mold conveying belt is arranged in front of the discharge port of the steelmaking furnace clarifying tank, a plurality of hub manufacturing molds are arranged on the conveying belt at the same interval, an electric gate is arranged at the outlet of the intermediate frequency furnace and the discharge port of the steelmaking clarifying tank, a pouring ladle is arranged below the discharge port of the steelmaking clarifying tank, an electronic scale and an inclined pouring mechanism are arranged on the pouring ladle, the inclined pouring mechanism is rotated after weighing, and the pouring ladle is poured into the mold after being inclined, and the mold is cooled, demolded and formed into a ceramic shell after being coated with refractory material on the outer periphery of a fusible material inner mold, The thickness of the upper layer of refractory bricks of the inclined structure pool wall towards the clarifying tank is greater than the thickness of the lower layer of refractory bricks, the thickness of the upper layer of refractory bricks of the inclined structure pool wall towards the clarifying tank is greater than the thickness of the lower layer of refractory bricks, the outer side of the pool wall on one side of the furnace front is a vertical pool wall, and the inner side of the pool wall towards the steelmaking clarifying tank is an inclined pool wall, grooves and through holes are arranged in the refractory bricks in the height direction of the furnace front, and counterbores are arranged at both ends of the through holes.

2. A nanohub casting production line according to claim 1, characterized in that: The intermediate frequency furnace is provided with a feeding port above the intermediate frequency furnace, the feeding port comprises a feeding port of a nanometer powder material furnace front stock bin and a feeding port of an iron raw material stock bin, a discharge port is arranged below the intermediate frequency furnace, a spiral feeder is arranged in front of the feeding port of the nanometer powder material furnace front stock bin, an inclined discharge channel is connected to the inner side of the front wall of the steelmaking furnace clarifying tank, and the inclined discharge channel is connected to the upper position of the inclined structure pool wall.

3. A nanohub casting production line according to claim 1, characterized in that: The intermediate frequency furnace is provided with an iron raw material feeding port and a nanometer powder material feeding port above the intermediate frequency furnace, and a nanometer powder material weighing and batching system and a mixing system are arranged in front of the nanometer powder material feeding port.

4. A nanohub casting production line according to claim 1, characterized in that: The platinum gate is arranged at the contact metal liquid part of the electric gate arranged at the outlet of the intermediate frequency furnace and the discharge port of the steelmaking clarifying tank.

5. A nanohub casting production line according to claim 1, characterized in that: The mold is an inner mold made of a fusible material, the outer part of the inner mold is coated with an environmentally friendly refractory mortar, and a ceramic shell mold is formed after drying, the inner mold is consistent with the shape of the product, a pouring port is left on the ceramic shell mold, and a cinder outlet is arranged below, the molten metal liquid melts the inner mold to form a hub product.

6. A nanohub casting line according to claim 3, characterized in that: A threaded rod is arranged in the through hole of the refractory brick, a hole pressing plate is arranged in the groove, the threaded rod comprises a screw rod, a nut is arranged at the upper end of the screw rod, the hole pressing plate is pressed below the nut, each refractory brick corresponds to a threaded rod, the threaded rod of the upper layer of refractory bricks is screwed on the nut at the upper end of the lower threaded rod, a steel structure is arranged around the pool wall in front of the steelmaking furnace clarifying tank, and the upper and lower ends of the pressing rod formed by the plurality of threaded rods are fixed on the upper and lower steel structures.

7. A method for producing a nanohub cast steel using a nanohub casting line as claimed in any one of claims 1 to 6, characterized in that: The component of the nanometer hub casting is: Cr 0.5~0.8%, Mn 0.55~0.8%, C 0.15~0.2%, Ni 0.03~0.05%, Nb 0.01~0.03%, Al 0.03~0.06%, Cu 0.06~0.1%, Co 0.02~0.05%, P+S+Ca≤0.03%, Mo+W+V+Ti+Sc+Sn≤0.02%, the balance is Fe, in addition to the Fe raw material, the rest components are nanometer powder, after mixing smelting in the medium frequency furnace, flowing into the large clarifying tank for clarification, used for hub production, when adding the material 1) first add the nanometer powder, heat to 500°C temperature; 2) then add the Fe raw material, heat to 1470°C; 3) flow the melted metal liquid into the steelmaking furnace clarifying tank, the molten liquid temperature in the steelmaking furnace clarifying tank is kept at 1350°C-1450°C; 4) implement pouring at the temperature of 1350°C-1400°C.

8. A method of producing a cast steel nanohub according to claim 7, characterized in that: The component of the nanometer hub casting is: Cr 0.55~0.7%, Mn 0.6~0.8%, C 0.16~0.18%, Ni 0.03~0.04%, Nb 0.01~0.02%, Al 0.04~0.055%, Cu 0.07~0.09%, Co 0.02~0.04%, P+S+Ca≤0.025%, Mo+W+V+Ti+Sc+Sn≤0.015%, the balance is Fe. ​

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