Manufacturing process of wear-resistant lining plate with long service life and toughness

Abstract

The invention discloses a manufacturing process of a long-service-life tough wear-resistant lining plate, and relates to the technical field of metal material preparation. Comprising a centrifugal casting mold body composed of multiple layers, a plurality of lining plate mold bodies are evenly arranged on the periphery of each layer with a rotating shaft as the center, centrifugal casting of solid lining plates is achieved, use of casting sand and binders is greatly reduced, chemical pollution, solid waste generation and dust pollution are reduced, and the centrifugal casting mold is more environmentally friendly; the requirements of large-scale production can be met; centrifugal force is applied to molten iron, growth of austenite dendritic crystals is limited, rapid cooling is carried out, fine graphite nodules and short-distance austenite dendritic crystals are finally obtained, and fine acicular ferrite with the large graphite nodule quantity is presented after isothermal quenching; cr is added to increase carbide hard spots, so that the structure of the lining plate presents a wear-resistant phase, the abrasion is 25% lower than that of high-chromium cast iron, the lining plate is suitable for high-abrasion and high-impact funnel equipment in the industries of mines, metallurgy and the like, and the maintenance frequency and the shutdown cost are remarkably reduced.

Description

Technical Field

[0001] The invention relates to the field of mechanical parts manufacturing, and in particular to a manufacturing process of a long-life, strong, tough, and wear-resistant liner. Background Art

[0002] Wear-resistant liners are protective components installed inside equipment such as material conveying, crushing, and grinding equipment. They are primarily used to protect the equipment from direct wear from materials, extending its service life. Their core function is to leverage their inherent wear resistance to concentrate wear on the liner, thereby protecting the main equipment structure (such as the hopper, chute, and crusher chamber) from rapid wear. Common production methods for wear-resistant liners include sandbox casting and V-casting, which are complex processes with low production efficiency. The resulting wear-resistant liners are generally of average quality and generate harmful gases and solid waste, which are environmentally unfriendly.

[0003] In view of this, in order to improve the overall quality of wear-resistant liners and meet the market demand for high wear resistance and long life liners, it is necessary to develop a highly efficient and environmentally friendly manufacturing process. Summary of the Invention

[0004] The present invention provides a manufacturing process for a long-life, strong and tough wear-resistant liner, so as to achieve the purpose of changing the production mode of the wear-resistant liner, improving production efficiency, and improving the performance and quality of the wear-resistant liner.

[0005] A centrifugal casting mold for a long-life, strong, tough, and wear-resistant liner, characterized in that the centrifugal casting mold is composed of multiple layers, including a base plate and a cover plate on each layer; mounting holes are provided at corresponding positions of the base plate and the cover plate, and through bolts are provided in the mounting holes, and the base plate and the cover plate are fixed to the vertical centrifuge by the through bolts; a plurality of liner molds are evenly arranged around the rotating shaft on each base plate of the mold, and radial runners are provided at corresponding positions of the liner molds; a refractory clay convex hump is provided at the center of one base plate, so that the molten iron can flow to the surrounding radial runners when pouring molten iron; a center hole is provided at the center of the middle base plate for inserting the pouring riser of the lower layer; a cofferdam is provided at the edge of the center hole to prevent the molten iron of this layer from falling into the lower layer; an annular runner is provided outwardly of the cofferdam, and the annular runner is connected to the radial runner; the cover plate is provided with a center hole, and a cofferdam is provided at the edge of the center hole, and the center hole is larger to make room for all the pouring risers of the lower layer; the area outside the annular runner and the radial runner of each layer is filled with refractory sand with the same thickness.

[0006] Furthermore, the annular runner and radial runner are both welded from section steel, with refractory sand as the lining and spray coating on the surface.

[0007] Furthermore, the lining mold includes a mold lower plate and a mold upper plate. Air holes are evenly arranged on the mold upper plate and the mold lower plate, filled and leveled with coated sand, and the inner side surfaces are sprayed with paint and baked and cured, so that they are well breathable and easy to demold. Square steel is arranged between the mold upper plate and the mold lower plate, and the lining cavity is assembled through the square steel and spot welded to the mold upper plate or the mold lower plate. The position of the lining cavity opening corresponds to the radial runner position; asbestos pad sealing mud is filled on the outside of the lining cavity, and a bolt core prefabricated with coated sand is arranged in the lining cavity at a position corresponding to the screw hole of the liner; after the mold lower plate and the mold upper plate are buckled together, the four corners are fastened with bolts.

[0008] Furthermore, the coating is prepared by uniformly stirring silica powder as refractory powder, bentonite as suspending agent, water as carrier liquid, and water glass as binder, and can adhere to the surface of the metal mold to play a role in heat insulation protection.

[0009] Furthermore, the liner template will bend after being poured with molten iron several times in a row, and the template needs to be turned over for use to correct the deformation. The template can be reused by using the front and back alternately.

[0010] Furthermore, a support plate surface is provided on each layer of the base plate, the liner mold is installed on the support plate surface, the liner cavity opening corresponds to the radial gate, and an asbestos pad is provided between them; baffles are provided on both sides of the support plate surface, and notches are provided on the liner mold at positions corresponding to the baffles, and a wedge is driven between the baffle and the notch to fix the liner mold on the base plate.

[0011] Based on the centrifugal casting mold of the long-life, strong, tough, and wear-resistant liner according to claim 1, a manufacturing process of the long-life, strong, tough, and wear-resistant liner is characterized by comprising the following steps: The first step is to melt the selected raw materials in a medium frequency induction furnace to make the alloy composition fully homogenized; add silicon carbide to increase carbon in the furnace, adjust the CE range to 4.5%, and take it out of the furnace at 1420°C; The second step is to introduce the molten iron into the spheroidizing bag and adopt the wire feeding spheroidizing process for spheroidization. It will reach the casting platform of the vertical centrifuge 90 seconds after the slag is removed. The third step is to quickly pour the molten iron into each layer of the casting mold rotating on the vertical centrifuge through multiple pouring pipes set on the pouring platform. The molten iron enters the pouring port through the radial pouring channel and flows into the liner mold under the action of centrifugal force.

[0012] Step 4: After pouring, the centrifugal casting mold is cooled; after 20 minutes, the centrifuge stops rotating; Step 5: Remove the mold and install another set of molds on the centrifuge; Step 6: Repeat steps 2 to 5 for the newly installed mold to achieve continuous operation; disassemble the removed mold, remove the liner, and cut off the gate part by plasma cutting; Step 7: Place the liner plates upright in the material basket. Warm quenching is performed using alternating water-air quenching followed by isothermal treatment in an air furnace to prevent thermal warping. Use blocks to separate the liner plates, with intervals of 1.5 plate thicknesses, to ensure unimpeded cooling water flow.

[0013] Furthermore, the water-air alternating quenching + air furnace isothermal treatment first enters the air quenching furnace to heat for 1 hour, keeps warm at 880°C for 1 hour, is taken out by forklift lift, enters water to cool for 15 seconds within 15 seconds, then rises above the water surface, stays in the air for 15 seconds, slightly uniformizes the temperature of the liner, enters water to cool for 10 seconds for the second time, rises above the water surface for the second time, the liner temperature is about 280°C, enters a 280°C tempering furnace to keep warm for 1.5 hours, and air cools; the water temperature before quenching is 32°C, and the water temperature after quenching is 36°C. During the quenching process, high-pressure air is sprayed from the bottom of the pool for stirring, and the propeller rotates and stirs from one side. The outdoor cooling tower provides circulating heat dissipation for the quenching pool, and continuous heat treatment is performed. The quenching water pool is kept below 40°C to maintain the quenching intensity.

[0014] Furthermore, the rotation speed of the vertical centrifuge is selected to be 100 rpm.

[0015] The present invention provides a manufacturing process for a long-life, strong, and wear-resistant liner, which realizes centrifugal casting of a solid liner. Compared with traditional sand box casting, it greatly reduces the use of casting sand and binder, reduces chemical pollution, the generation of solid waste and dust pollution, and is more environmentally friendly. The one-mold, multi-cavity centrifugal casting mold design realizes rapid batch production of blanks. After subsequent processing steps, the production cycle is short, which can meet the needs of large-scale production. CADI ductile iron centrifugal casting thin-walled liner, centrifugal force is applied to the molten iron to limit the growth of austenite dendrites, and extremely rapid cooling is performed to finally obtain fine graphite balls and short-spacing austenite dendrites, which present a large amount of graphite balls and fine acicular ferrite after isothermal quenching. Cr is added to increase carbide hard points, so that the liner structure presents a wear-resistant phase, and the wear is 25% lower than that of high-chromium cast iron. This solution is particularly suitable for high-wear and high-impact funnel equipment in mining, metallurgy and other industries, and can significantly reduce maintenance frequency and downtime costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the centrifugal casting mold of the present invention; Figure 2 1 is a schematic structural diagram of a bottom plate of a centrifugal casting mold according to an embodiment of the present invention; Figure 3 1 is a schematic structural diagram of a second bottom plate of a centrifugal casting mold according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the liner mold of the present invention; Figure 5 It is a schematic diagram of the structure inside the liner mold of the present invention; Figure 6 This is a schematic structural diagram of a centrifugal casting mold cover plate of the present invention; Figure 7 This is a process curve diagram of austempering of a centrifugal casting mold of the present invention; Figure 8 The invention is centrifugally cast and traditional sand casting liner, carbide-containing and carbide-free, as-cast and austempered liner are compared. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0018] like Figure 1 As shown, this embodiment provides a centrifugal casting mold for a long-life, strong, and wear-resistant liner. The mold consists of three layers: a first-layer base plate 1, a second-layer base plate 2, a third-layer base plate 3, and a cover plate 4. Six liner molds 5 are evenly arranged around each base plate, centered around the rotating axis. The pouring weight of the three-layer liner casting is 450 kg, which matches the 500 kg capacity of the factory's current melting furnace. Mounting holes 6 are provided at corresponding positions of each bottom plate and cover plate, and through-bolts are provided in the mounting holes to fix the bottom plate and cover plate to the vertical centrifuge through the through-bolts; like Figure 2 As shown, a refractory clay convex bag is set in the center of the bottom plate, and when pouring molten iron, the molten iron can flow to the surrounding radial runner 12; Figure 3 As shown, a center hole 13 is provided in the center of the second-layer bottom plate for inserting the pouring riser of the lower layer; a cofferdam 14 is provided at the edge of the center hole to prevent the molten iron of this layer from falling into the lower layer; an annular runner 15 is provided outward from the cofferdam, and the annular runner is connected to the radial runner 12, and the radial runner corresponds to each lining plate mold 5; compared with the second-layer bottom plate, the center hole of the third-layer bottom plate is larger, making room for the first and second bottom plates; the cover plate is provided with a center hole 13, and a cofferdam is provided at the edge of the center hole. The center hole is larger, making room for all the pouring risers of the lower layer; in addition to fixing each layer of the bottom plate, the cover plate also fixes the refractory bricks of the top layer.

[0019] In this embodiment, to save materials and reduce costs, the first-layer base plate 1, the second-layer base plate 2, and the third-layer base plate 3 all include a base plate 16 and a runner assembly 17, which are welded together. The annular runner and radial runner surfaces on the runner assembly are lined with refractory sand and sprayed with paint to prevent direct contact between molten iron and the runner assembly, which could damage the runner assembly. The areas outside the annular runner and radial runner are filled with refractory sand to the same height, forming a "trench" pattern. After the previous base plate is installed, there are no gaps between the layers, preventing molten iron from entering the gaps between the layers and reducing interlayer leakage. The fan-shaped section of the radial gate of the runner assembly is provided with a mounting groove 18, within which refractory bricks 19 are installed. An outlet 20 is provided between the refractory bricks and the runner assembly, corresponding to the position of the liner mold. After pouring is completed, these bricks are removed, and the liner casting, along with the gate, can be removed.

[0020] The annular runner is the landing point for the molten iron. A slightly wider design prevents overflow, and the molten iron then flows into the narrower radial runner. The narrow runner has a small heat dissipation area, which helps maintain the fluidity of the molten iron. As it approaches the liner, the gate widens into a fan-shaped shape, which facilitates filling the liner and allows for continuous pouring and bubbling to remove gas, preventing "air suffocation" in the mold cavity.

[0021] Each lining mold includes a mold lower plate 7 and a mold upper plate 8. The mold upper plate and the mold lower plate have air holes 9 with a diameter of Ф8 distributed in a 30mm×30mm grid, which are filled and leveled with coated sand. The entire metal mold surface is sprayed with 2mm of paint and baked and cured at 280°C for 20 minutes. It has good air permeability and is easy to demould, resulting in a lining casting with a smooth surface. The paint is made of silica powder as refractory powder, bentonite as suspending agent, water as carrier liquid, and water glass as binder, and is evenly stirred and prepared. It can adhere to the surface of the metal mold and play a role in heat insulation protection.

[0022] When producing a 20mm liner, a 20mm thick square steel 10 is set between the upper and lower plates of the mold. The square steel is assembled into a liner cavity and spot welded to the upper or lower plate of the mold. An opening 11 is reserved in the liner cavity, and its position corresponds to the position of the outlet 20. A conforming asbestos pad is set on the top of the square steel assembled into the liner cavity. A prefabricated bolt core made of coated sand is set in the liner cavity at the position corresponding to the screw hole of the liner. Then the lower and upper plates of the mold are buckled together and bolted at the four corners. This makes the liner mold airtight and prevents the poured molten iron from leaking or overflowing. Due to the shrinkage of the liner molten iron, the parts that need to be evacuated are mainly the bolt holes. Therefore, a prefabricated bolt core made of coated sand is set to meet the evacuation condition. In addition, since the lower and upper plates of the liner mold will be arched after repeated use, the inside and outside of the lower and upper plates can be reversed after a period of use to correct the deformation, so that the lower and upper plates can be reused repeatedly. Under this process condition, paint, bolt core and coated sand are molding consumables, and the amount used is extremely small. There is no other consumption, which is environmentally friendly.

[0023] like Figure 2-3 As shown, a support plate surface 21 is provided on each bottom plate, and the liner mold is installed on the support plate surface. The opening surface of the liner cavity corresponds to the radial runner outlet surface, and an asbestos pad is provided between them; Figure 4 As shown, baffles 22 are provided on both sides of the support plate surface, notches 23 are provided on the lining plate mold at positions corresponding to the baffles, and wedges 24 are driven between the baffles and the notches to fix the lining plate mold on the base plate; in actual production, using one wedge on the left and one on the right is sufficient to install and fix the lining plate mold on the base plate. In order to further increase the reliability of fixation, vertical plates 25 are provided on the side of the baffle, and notches 26 are provided on the vertical plates. The position of the notch corresponds to the height of the lining plate mold, and driving a wedge can further fix the lining plate mold.

[0024] A manufacturing process for a long-life, strong, and wear-resistant liner provided in a centrifugal casting mold according to this embodiment includes the following steps: The first step is to melt the selected raw materials in a medium frequency induction furnace to make the alloy composition fully homogenized; add silicon carbide to increase carbon in the furnace, adjust the CE range to about 4.5%, and take it out of the furnace at about 1420°C; The second step is to introduce the molten iron into the spheroidizing bag and adopt the wire feeding spheroidizing process for spheroidization. It will reach the casting platform of the vertical centrifuge 90 seconds after the slag is removed. The third step is to rapidly pour molten iron into each runner layer of the casting mold rotating in a vertical centrifuge through multiple pouring pipes 27 installed on the pouring platform. Silicon-bismuth inoculants are added along the flow. The molten iron enters the pouring port through radial runners and, under the action of centrifugal force, flows into the liner mold. The vertical centrifuge's rotation speed is selected to be 100 rpm, which achieves a gravity coefficient of 5.4, ensuring good mold filling of the liner casting. At 200 rpm, the gravity coefficient increases to 22, increasing the possibility of molten iron leakage and splashing. A total of 18 liner plates are cast in the three layers, weighing 450 kg, and the smelting furnace capacity is 500 kg.

[0025] Step 4: After pouring is completed, the mold is cooled naturally for 20 minutes and the centrifuge stops rotating.

[0026] Step 5: Remove the mold and install another set of molds on the centrifuge; Step 6: Repeat steps 2 to 5 for the newly installed mold to achieve continuous operation; disassemble the removed mold, remove the liner, and use plasma cutting to remove the gate part; Step 7: Place the lining plates in a basket and place them upright to prevent them from warping due to heat. Use blocks to separate the lining plates, with a spacing of 1.5 plate thicknesses to ensure smooth flow of cooling water during quenching. Isothermal quenching adopts water-air alternating quenching + air furnace isothermal treatment. Figure 7As shown, the liner is first placed in an air quenching furnace for an hour, then held at 880°C for an hour. The liner is then removed by a forklift and immersed in water for a cooling period of 15 seconds. The liner is then lifted out of the water and held in air for 15 seconds to even out the liner temperature. The liner is then immersed in water for a second cooling period of 10 seconds. After being lifted out of the water again, the liner reaches approximately 280°C. The liner is then placed in a tempering furnace at 280°C for 1.5 hours and then air-cooled. The water temperature is 32°C before quenching and 36°C after quenching. During the quenching process, high-pressure air is sprayed from the bottom of the tank, and a propeller rotates from one side to stir the liner. An outdoor cooling tower provides circulating heat dissipation for the quenching tank. This continuous heat treatment process maintains the quenching water temperature below 40°C to maintain the quenching intensity. After austempering, the liner achieves a hardness of 55-59 HRC and an impact strength of 9-12J.

[0027] Liners are subject to impact and wear from ore during operation and must possess high strength and wear resistance. Experience shows that an impact toughness of 9J ensures protection against breakage and belt tearing. High-chromium cast iron, with an impact toughness of 4J, is not suitable for use in port machinery liners unless the material is extremely small, especially for thin liners measuring 14mm to 16mm.

[0028] According to GB / T24733-2009 and QTD1200-3 grades of "Austempered Ductile Iron Castings", the chemical composition of the liner produced by the manufacturing process of this application is shown in Table 1. Table 1. Chemical composition of lining board (w%) Since the 20mm liner is a thin-walled casting with good hardenability, there is no need to add rare metals such as Mo and Cu. By adding Cr appropriately to obtain 10% to 15% carbides, the final product is CADI austempered ductile iron.

[0029] The liner is a thin-walled casting, formed between the upper and lower metal mold templates, with a significant chilling effect. The columnar crystals between the fine crystals on the upper and lower surfaces run through the cross section of the liner, and no equiaxed crystals appear in the middle. The end surface of the liner has a white cast transgranular structure, which makes the spheroidization rate high, up to 1019 balls / mm2, the cast hardness HRC45, and the austempering hardness HRC55~59.

[0030] Table 2. Performance comparison between the centrifugal casting liner of this application and the traditional sand casting liner Comparison of centrifugal casting and sand casting liners, carbide-containing and carbide-free, as-cast and austempered gold, with reference to Figure 8 .

[0031] The present invention provides a manufacturing process for a long-life, strong, and wear-resistant liner, which realizes centrifugal casting of a solid liner. Compared with traditional sand box casting, it greatly reduces the use of casting sand and binder, reduces chemical pollution, the generation of solid waste and dust pollution, and is more environmentally friendly. The one-mold, multi-cavity centrifugal casting mold design realizes rapid batch production of blanks. After subsequent processing steps, the production cycle is short, which can meet the needs of large-scale production. CADI ductile iron centrifugal casting thin-walled liner, centrifugal force is applied to the molten iron to limit the growth of austenite dendrites, and extremely rapid cooling is performed to finally obtain fine graphite balls and short-spacing austenite dendrites, which present a large amount of graphite balls and fine acicular ferrite after isothermal quenching. Cr is added to increase carbide hard points, so that the liner structure presents a wear-resistant phase, and the wear is 25% lower than that of high-chromium cast iron. This solution is particularly suitable for high-wear and high-impact funnel equipment in mining, metallurgy and other industries, and can significantly reduce maintenance frequency and downtime costs.

[0032] The above embodiments are provided for persons familiar with the art to implement or use the technical solutions of the present application. The temperature and time mentioned in the solutions are standard times for reference. There is no need to pursue absolute accuracy in actual production. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the idea of ​​the technical solutions of the present application. Therefore, the scope of protection of the present application is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A centrifugal casting mold for a long-life, strong, wear-resistant liner, characterized in that: The centrifugal casting mold is composed of multiple layers, including a base plate and a cover plate of each layer; a plurality of liner molds are evenly arranged around the rotating shaft on each base plate of the mold, and radial runners are set at positions corresponding to the liner molds; the radial runners on one base plate converge to the center, and a refractory clay bulge is set at the center; refractory clay is set at the center of one base plate; a center hole is set at the center of the middle base plate for inserting the pouring riser of the lower layer; a cofferdam is set at the edge of the center hole to prevent the molten iron of this layer from falling into the lower layer; an annular runner is set outward from the cofferdam, and the annular runner is connected to the radial runner; the cover plate is provided with a center hole, and a cofferdam is set at the edge of the center hole. The center hole is larger to make room for all the pouring risers of the lower layer; refractory sand is lined on the surface of the annular runner and radial runner of each layer and sprayed with paint; other areas are filled with refractory sand so that the bottom surface of the upper base plate cooperates with it to seal; mounting holes are set at corresponding positions of the base plate and the cover plate, and through bolts are set in the mounting holes, and the base plate and the cover plate are fixed to the vertical centrifuge by the through bolts.

2. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 1, characterized in that: The sector of the radial gate is connected by an upper and a lower part, the upper part of which is a movable refractory brick. After the pouring is completed, the brick is removed and the liner casting together with the gate can be taken out.

3. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 1, characterized in that: A support plate surface is provided on each layer of the bottom plate, and the liner mold is installed on the support plate surface. The liner cavity opening corresponds to the radial gate, and an asbestos pad is provided between them; baffles are provided on both sides of the support plate surface, and notches are provided on the liner mold at positions corresponding to the baffles. A wedge is driven between the baffle and the notch to fix the liner mold on the bottom plate.

4. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 1, characterized in that: The lining mold comprises a mold lower plate and a mold upper plate, and the mold upper plate and the mold lower plate are evenly provided with air holes, which are filled and leveled with coated sand; the lining cavity is assembled through square steel and fixed to the mold upper plate or the mold lower plate by spot welding, and the position of the lining cavity opening corresponds to the radial runner position; the outer edge of the lining cavity is padded with asbestos pads, and the mold upper plate and the mold lower plate are buckled and sealed; the inner side surface of the lining mold is sprayed with paint and baked and cured, so that it has good air permeability and easy demoulding; bolt cores prefabricated with coated sand are set in the lining cavity at positions corresponding to the screw holes of the liner; after the mold lower plate and the mold upper plate are buckled, the four corners are fastened with bolts.

5. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 4, characterized in that: The coating is prepared by uniformly stirring and mixing silica powder as refractory powder, bentonite as suspending agent, water as carrier liquid and water glass as binder. The coating can adhere to the surface of the metal mold and play a role of heat insulation protection.

6. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 1, characterized in that: The lining plate template will be arched after several consecutive iron liquid pourings. The template can be turned over and used to correct the deformation. The template can be reused by using the front and back alternately, thereby increasing the service life.

7. The centrifugal casting mold for a long-life, strong, and wear-resistant liner according to claim 1, characterized in that: A support plate surface is provided on each layer of the bottom plate, and the liner mold is installed on the support plate surface. The liner cavity opening corresponds to the radial gate, and an asbestos pad is provided between them; baffles are provided on both sides of the support plate surface, and notches are provided on the liner mold at positions corresponding to the baffles. A wedge is driven between the baffle and the notch to fix the liner mold on the bottom plate.

8. A manufacturing process for a long-life, strong, and wear-resistant liner based on the centrifugal casting mold of claim 1, characterized in that: The following steps are involved: The first step is to melt the selected raw materials in a medium frequency induction furnace to make the alloy composition fully homogenized; add silicon carbide to increase carbon in the furnace, adjust the CE range to about 4.5%, and take it out of the furnace at about 1420°; The second step is to introduce the molten iron into the spheroidizing bag and adopt the wire feeding spheroidizing process for spheroidization. After slag removal, it reaches the casting platform of the vertical centrifuge; The third step is to quickly pour the molten iron into each layer of the casting mold rotating on the vertical centrifuge through multiple pouring pipes set on the pouring platform. The molten iron enters the pouring gate through the radial pouring channel and flows into the liner mold under the action of centrifugal force. Step 4: After pouring, the centrifugal casting mold is cooled; the centrifuge stops rotating; Step 5: Remove the mold and install another set of molds on the centrifuge; Step 6: Repeat steps 2 to 5 for the newly installed mold to achieve continuous operation; disassemble the removed mold, remove the liner, and cut off the excess part of the gate; Step 7: Heat treatment of the lining plate.

9. The manufacturing process of a long-life, strong and wear-resistant liner according to claim 8, characterized in that: The heat treatment method is water-air alternating quenching + isothermal treatment in an air furnace; the liner is placed upright in a material basket and first enters an air quenching furnace to heat up for 1 hour, keep warm at 880°C for 1 hour, take it out by forklift lift, enter water within 15 seconds to cool for 15 seconds, then rise above the water surface, stay in the air for 15 seconds to slightly uniformize the temperature of the liner, enter water for cooling for 10 seconds a second time, rise above the water surface a second time, the liner temperature is about 280°, enter a 280° tempering furnace to keep warm for 1.5 hours, and air cool; the water temperature before quenching is 32°, and the water temperature after quenching is 36°. During the quenching process, high-pressure air is sprayed from the bottom of the pool for stirring, and a propeller rotates and stirs from one side. The outdoor cooling tower provides circulating heat dissipation for the quenching pool, and continuous heat treatment is performed. The quenching pool is kept below 40° to maintain the quenching intensity.

10. The manufacturing process of a long-life, strong, tough, and wear-resistant liner according to claim 8, wherein the rotation speed of the vertical centrifuge is 100 rpm.

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