High-quality wear-resistant round roller for crusher and preparation method of high-quality wear-resistant round roller

Abstract

The invention discloses a high-quality wear-resistant round roller for a crusher and a preparation method of the high-quality wear-resistant round roller, and belongs to the technical field of high manganese steel materials and crushing machinery. The wear-resistant round roller comprises a round roller body assembly and a plurality of wear-resistant blocks detachably arranged on the peripheral wall of the round roller body assembly, the wear-resistant blocks are fixed through a welding platform, convenient replacement after local wear is achieved, and the overall service life of the round roller is remarkably prolonged. The core of the preparation method is as follows: high manganese steel with specific components (C-Mn-Cr-Ni-Mo-RE) is adopted; a rare earth composite treatment agent with the ratio of La to Ce being 1: (1.6-1.8) is added at the 1 / 3-1 / 2 height of the liquid level of a molten metal casting ladle for modification treatment, molten steel is effectively purified, inclusions are spheroidized, and grains are refined; the invention further discloses an optimized water toughening treatment process. The round roller wear-resistant block prepared through the method has excellent surface hardness, wear resistance and impact toughness, the problem that a traditional high manganese steel round roller wear-resistant part is prone to being rapidly worn is solved, and meanwhile the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high manganese steel materials, in particular to a high-quality wear-resistant round roller for a crusher and a preparation method thereof. Background Art

[0002] The rollers in a crusher are the core working components of a roller crusher, squeezing, shearing, or crushing materials through counter-rotation. In the prior art, the wear-resistant teeth of the rollers are typically integrally cast or welded to the roller body. This structure has a significant drawback: as the component directly subject to wear, the wear rate of the wear-resistant teeth is much higher than that of the roller base material. When some wear-resistant teeth are severely worn, the crushing efficiency of the entire roller drops sharply, but the roller base material often still has value. Replacing the entire roller is not only costly but also wastes material. Furthermore, even when high-manganese steel is used to manufacture the entire wear-resistant toothed roller, the material's toughness, work-hardening capacity, and ultimate wear resistance are not fully utilized due to issues such as the poor morphology and distribution of carbides in the as-cast structure and brittle inclusions at the grain boundaries. This means that the service life of the wear-resistant teeth still has significant room for improvement. Therefore, there is an urgent need to develop a crusher roller with replaceable wear-resistant teeth and a significantly optimized base material performance, as well as a preparation method. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a high-quality wear-resistant round roller for the crusher and a preparation method thereof, which solves the two key problems pointed out in the background technology: "high overall replacement cost" and "insufficient wear resistance of traditional high manganese steel".

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-quality wear-resistant round roller for a crusher and a preparation method thereof, comprising a round roller body and a lifting frame arranged thereon, the round roller body being composed of a plurality of round stick body assemblies, a plurality of wear-resistant blocks being detachably fixedly connected to the outer peripheral wall of the round stick body assembly, and the wear-resistant blocks being arranged at intervals on the outer peripheral wall of the round stick body assembly through a welding platform.

[0005] Preferably, the welding platform is fixedly connected to the outer wall of the round rod body assembly, and the wear-resistant block is replaceably welded to the welding platform.

[0006] Preferably, the method comprises the following steps:

[0007] S1: Raw material pretreatment: The chemical composition of the high-performance high-manganese steel material requires precise batching, and after mixing, it is smelted and refined to obtain molten metal, and the molten metal is deoxidized;

[0008] S2: Molten metal modification and pouring: The molten metal deoxidized in S1 is transferred to a ladle. When the molten metal level in the ladle reaches 1 / 3 to 1 / 2 of the ladle height, a rare earth composite treatment agent is added to the molten metal.

[0009] The rare earth composite treatment agent is composed of a mixture of lanthanide rare earth and cerium rare earth in a weight ratio of 1: (1.6-1.8), and the weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100: (0.2-0.6);

[0010] After adding the rare earth composite treatment agent, let it stand for 10 to 15 minutes, and take samples to test to ensure that the dissolved oxygen content is ≤30ppm;

[0011] Then, inert gas is blown into the bottom of the ladle for protection, and the ladle is poured into a mold to form a cast steel billet.

[0012] S3: Water annealing: The cast steel billet is subjected to water annealing, which includes: heating the billet to 650°C at an initial rate of ≤50°C / h, then heating to 1080°C±5°C at the rated power of the heat treatment furnace, and holding the temperature for 4 hours; after the holding period, completely immersing the billet in a cooling water pool at a temperature of 30°C±5°C for ≤45 seconds; during the cooling process, the billet is kept in motion in the water by mechanical stirring or manual shaking; and the billet is removed after it is completely cooled;

[0013] The residual amount of rare earth elements in the final green body is controlled at 0.05% to 0.09%.

[0014] Preferably, based on S1:

[0015] The crusher uses high-quality round roller high manganese steel material, the chemical composition by mass percentage is: C: 1.0% ~ 1.20%, Si: 0.35% ~ 0.60%, Mn: 11.0% ~ 14.0%, Cr: 2.0% ~ 3.0%, Ni: 0.40% ~ 0.60%, Mo: 0.20% ~ 1.0%, S ≤ 0.035%, P ≤ 0.040%, Al ≤ 0.06%, rare earth (RE): 0.05% ~ 0.09%, the balance is Fe and unavoidable impurities;

[0016] Wherein, the rare earth (RE) is mainly composed of lanthanum (La) and cerium (Ce).

[0017] Preferably, based on S1:

[0018] Melting and refining treatment: medium frequency induction furnace is used for melting, the melting temperature is controlled at 1550-1600℃, alloy elements are added in batches during the melting process, and argon is introduced for stirring during the refining process.

[0019] Preferably, based on S2:

[0020] When the height of the deoxidized molten metal in the ladle accounts for one-third to one-half of the ladle height, add a rare earth composite treatment agent to the molten metal to directly react with dissolved oxygen to form oxides that precipitate and float. After deoxidation, let it stand for 10 to 15 minutes and take samples to test the oxygen content ≤30ppm;

[0021] The rare earth composite treatment agent is composed of a mixture of lanthanum rare earth and cerium rare earth, and the weight ratio of lanthanum rare earth to cerium rare earth is 1:1.6-1.8;

[0022] The weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100:0.2-0.6.

[0023] Preferably, in step S3, when loading the furnace, the distance between the green bodies is kept at not less than 50 mm, and refractory bricks are provided between the green bodies and the furnace wall for thermal insulation;

[0024] During the insulation stage, the atmosphere in the furnace is kept dry and clean;

[0025] Initial heating stage: heating at an initial heating rate of 50°C / h;

[0026] Medium-speed heating stage: When the temperature reaches 650℃ and is kept for 2 hours, the heating speed is based on the rated power of the heat treatment furnace;

[0027] Insulation stage: The insulation time is 4 hours according to the wall thickness of the lining. During the insulation process, the temperature in the furnace is kept stable at 1080℃, and the temperature fluctuation range is controlled within ±5℃;

[0028] Preparation for unloading: After the holding time is over, open the furnace door and prepare to unload the green body. Before unloading, ensure that the water temperature in the cooling water pool is controlled at 30℃.

[0029] Quick immersion in water: The casting should be immersed in water for no more than 45 seconds after being taken out of the furnace, and the blank should be completely immersed in the cooling water pool;

[0030] Water movement: keep the casting in motion in water, achieved by mechanical stirring or artificial shaking;

[0031] Complete cooling: After the blank has completely cooled in the water, take it out of the pool.

[0032] Preferably, the residual amount of rare earth is controlled at 0.05% to 0.09%.

[0033] The present invention discloses a high-quality wear-resistant circular roller for a crusher and a preparation method thereof, which has the following beneficial effects:

[0034] 1. The crusher uses high-quality wear-resistant round rollers and their preparation method. The wear-resistant teeth are designed as independent wear-resistant blocks, which are detachably fixed to the round roller body assembly through a welding platform. This design allows that when a single wear-resistant block exceeds the wear standard, it can be removed by gas cutting and the surface of the welding platform is polished and cleaned before re-welding a new wear-resistant block. This completely solves the problem of the entire round roller being scrapped due to local wear, extends the service life of the round roller body assembly by several times, and significantly reduces equipment maintenance costs and spare parts consumption.

[0035] 2. The crusher uses high-quality wear-resistant round rollers and their preparation method, significantly improving the metallurgical quality of the material: rare earth modification treatment effectively purifies the molten steel (increased deoxidation rate, [O] ≤ 30ppm; desulfurization) and significantly reduces brittle inclusions at grain boundaries. Rare earths spheroidize and disperse the carbides and inclusions, refining the grains. Strictly controlled harmful elements (S, P) and optimized rare earth residues further ensure the purity and uniformity of the material.

[0036] 3. The crusher utilizes high-quality wear-resistant round rollers and their manufacturing method, along with an optimized water-toughening process, to achieve a single, uniform, supercooled austenite structure. This structure rapidly produces significant work-hardening under the impact loads of crushing conditions, significantly increasing surface hardness to over HB500. This enhanced core toughness and strength (due to composition design, grain refinement, and grain boundary purification) ensures the wear-resistant blocks possess both high surface hardness and high toughness, extending their wear life by an estimated 30%-50% compared to wear-resistant parts made from conventional high-manganese steel.

[0037] 4. The crusher uses high-quality wear-resistant round rollers and their preparation method, and the process is stable and controllable: the key process parameters (timing / amount / ratio of rare earth addition, water toughening temperature / time / cooling speed) are clear and optimized through practice, with good reproducibility, suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0040] Figure 2 This is a schematic diagram of the assembly of the round stick body assembly of this embodiment;

[0041] Figure 3 This is a schematic structural diagram of the round stick body assembly of this embodiment;

[0042] Figure 4 This is a schematic structural diagram of the other side of the round stick body assembly of this embodiment;

[0043] Figure 5 This is a schematic diagram of the grinding gear structure of this embodiment;

[0044] Figure 6 This is a flow chart for preparing high-quality wear-resistant round rollers in this embodiment.

[0045] In the figure: 1. round rod body assembly; 21. welding platform; 22. wear-resistant block; 3. lifting frame. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] The embodiment of the present application provides a high-quality wear-resistant round roller for a crusher and a preparation method thereof, which solves the problem that the grinding teeth 2 will wear out after long-term use during the processing process, resulting in the round roller being unusable and requiring replacement of the round roller. The wear-resistant round roller 1 produced by the high-manganese steel material processed by the existing technology has a general strength, plasticity and toughness of the cast steel material, resulting in the grinding teeth 2 being damaged quickly when the material is extruded, sheared or crushed. The wear-resistant round roller 1 is lifted by the lifting frame 3. After the wear-resistant round roller 1 is lifted and installed, the wear-resistant round roller 1 is driven to rotate by the driving motor, so that the welding platform 21 on the outer peripheral wall of the wear-resistant round roller 1 rotates accordingly. The rotation of the welding platform 21 drives the wear-resistant block 22 to crush. When the wear-resistant block 22 is damaged after long-term use, the severely worn wear-resistant block 22 is replaced and a new wear-resistant block 22 is re-welded to ensure the crushing effect of the wear-resistant round roller 1.

[0048] High manganese steel is modified by selecting a rare earth composite modifier: the surface active elements in rare earths have a strong effect of refining primary crystals; rare earths significantly improve the morphology and distribution of carbides and inclusions in steel, making them spheroidized; rare earths have strong deoxidation and desulfurization capabilities, and react with harmful impurities such as oxygen and sulfur in molten steel to form high-melting-point products, effectively improving the metallurgical quality of high manganese steel;

[0049] By adjusting the timing of adding the rare earth composite treatment agent and the liquid level, the performance of the round rod can be optimized for different working conditions: more thorough deoxidation and inclusion purification, reducing brittle inclusions at grain boundaries, and improving material uniformity, making it suitable for working conditions requiring high fatigue strength or impact toughness. By refining the grains and adjusting the inclusion distribution by controlling the liquid level, the material's surface hardness and wear resistance are improved.

[0050] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0051] The embodiment of the present invention discloses a high-quality wear-resistant round roller for a crusher and a preparation method thereof.

[0052] According to the attached Figure 1-6 As shown, it includes a round stick body component 1 and a lifting frame 3 arranged thereon, and a plurality of wear-resistant blocks 22 are detachably fixedly connected to the outer peripheral wall of the round stick body component 1, and the wear-resistant blocks 22 are arranged on the outer peripheral wall of the round stick body component 1 at intervals through a welding platform 21.

[0053] The round roller body is composed of a plurality of round stick body components 1. In this embodiment, the round roller body is formed by three round stick body components 1.

[0054] The welding platform 21 is fixedly connected to the outer wall of the round rod body assembly 1 , and the wear-resistant block 22 is replaceably welded to the welding platform 21 .

[0055] The wear-resistant round roller 1 is lifted by the lifting frame 3. After the wear-resistant round roller 1 is lifted and installed, the wear-resistant round roller 1 is rotated by the driving motor, so that the welding platform 21 on the outer peripheral wall of the wear-resistant round roller 1 rotates accordingly, and the rotation of the welding platform 21 drives the wear-resistant block 22 to be broken;

[0056] When the wear-resistant blocks 22 are partially damaged after long-term use, the severely worn wear-resistant blocks 22 are replaced and new wear-resistant blocks 22 are re-welded to ensure the crushing effect of the wear-resistant round roller 1.

[0057] A method for preparing a high-quality wear-resistant round roller for a crusher comprises the following steps:

[0058] S1: Raw material pretreatment: The chemical composition of high-performance high manganese steel materials requires precise batching, and after mixing, smelting and refining are carried out to obtain molten metal, and the molten metal is deoxidized;

[0059] S2: Molten metal modification and pouring: The molten metal deoxidized in S1 is transferred to a ladle. When the molten metal level in the ladle reaches 1 / 3 to 1 / 2 of the ladle height, a rare earth composite treatment agent is added to the molten metal.

[0060] The rare earth composite treatment agent is composed of a mixture of lanthanide rare earth and cerium rare earth in a weight ratio of 1: (1.6-1.8), and the weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100: (0.2-0.6);

[0061] After adding the rare earth composite treatment agent, let it stand for 10 to 15 minutes, and take samples to test to ensure that the dissolved oxygen content is ≤30ppm;

[0062] Then, inert gas is blown into the bottom of the ladle for protection, and the ladle is poured into a mold to form a cast steel billet.

[0063] S3: Water annealing: The cast steel billet is subjected to water annealing, which includes: heating the billet to 650°C at an initial rate of ≤50°C / h, then heating it to 1080°C±5°C at the rated power of the heat treatment furnace, and holding it for 4 hours; after the holding period, completely immersing the billet in a cooling water pool at a temperature of 30°C±5°C within ≤45 seconds; during the cooling process, the billet is kept in motion in the water by mechanical stirring or manual shaking; and the billet is removed after it is completely cooled;

[0064] The residual amount of rare earth elements in the final green body is controlled at 0.05% to 0.09%.

[0065] Based on S1:

[0066] The crusher uses high-quality round roller high manganese steel material, the chemical composition by mass percentage is: C: 1.0% ~ 1.20%, Si: 0.35% ~ 0.60%, Mn: 11.0% ~ 14.0%, Cr: 2.0% ~ 3.0%, Ni: 0.40% ~ 0.60%, Mo: 0.20% ~ 1.0%, S ≤ 0.035%, P ≤ 0.040%, Al ≤ 0.06%, rare earth (RE): 0.05% ~ 0.09%, the balance is Fe and unavoidable impurities;

[0067] Among them, rare earth (RE) is mainly composed of lanthanum (La) and cerium (Ce).

[0068] Based on S1:

[0069] Melting and refining treatment: medium frequency induction furnace is used for melting, the melting temperature is controlled at 1550-1600℃, alloy elements are added in batches during the melting process, and argon is introduced for stirring during the refining process.

[0070] Based on S2:

[0071] When the height of the deoxidized molten metal in the ladle accounts for one-third to one-half of the ladle height, add a rare earth composite treatment agent to the molten metal to directly react with dissolved oxygen to form oxides that precipitate and float. After deoxidation, let it stand for 10 to 15 minutes and take samples to test the oxygen content ≤30ppm;

[0072] Adding the rare earth treatment agent when the ladle is one-third to one-half of the liquid level can ensure that the rare earth treatment agent is fully dispersed and participates in the reaction, avoiding burning caused by adding too early or uneven mixing caused by adding too late;

[0073] When the molten metal height is less than one-quarter of the ladle height, the volume of the molten steel is small, and the addition of the deoxidizer is affected by insufficient stirring intensity in the molten pool and thus affects uniform dispersion, resulting in incomplete reaction between the deoxidizing elements and inclusions.

[0074] When the molten metal height is between one-third and one-half, the volume of the molten steel increases and the stirring is sufficient. The deoxidizer can be quickly melted and evenly distributed, which promotes the aggregation and floating of deoxidation products, thereby efficiently purifying the molten steel.

[0075] When the height of the molten metal is higher than half the height of the ladle, the volume of the molten steel is too large and the stirring is insufficient. The deoxidizer can melt quickly and distribute on the surface, which cannot promote the aggregation and floating of the deoxidation products, and thus cannot efficiently purify the molten steel.

[0076] During actual operation, when the height of the deoxidized molten metal in the ladle accounts for one-third of the height of the ladle, the rare earth composite treatment agent is added.

[0077] The rare earth composite treatment agent is composed of a mixture of lanthanum rare earth and cerium rare earth, and the weight ratio of lanthanum rare earth to cerium rare earth is 1:1.6-1.8;

[0078] Modification of high manganese steel by selecting rare earth composite modifier:

[0079] 1. The surface active elements in rare earth elements have a strong effect of refining primary crystals;

[0080] Second: Use rare earth to significantly improve the morphology and distribution of carbides and inclusions in steel, making them spheroidized;

[0081] 3. Rare earths have strong deoxidation and desulfurization capabilities, and can generate high-melting-point products with harmful impurities such as oxygen and sulfur in molten steel, effectively improving the metallurgical quality of high manganese steel.

[0082] By adjusting the timing of adding the rare earth composite treatment agent and the liquid level conditions, the performance of the round roller can be optimized according to different working conditions:

[0083] 1: More thorough deoxidation and inclusion purification, reducing brittle inclusions at grain boundaries, improving material uniformity, and suitable for working conditions requiring high fatigue strength or impact toughness.

[0084] Second: Refine the grains and adjust the inclusion distribution by controlling the liquid level to improve the surface hardness and wear resistance of the material;

[0085] Rare earth treatment can significantly improve the oxidation resistance and corrosion resistance of steel.

[0086] The weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100:0.2-0.6.

[0087] Based on S3:

[0088] Furnace loading: The qualified cast steel billets are stably hoisted into the forklift heat treatment furnace. The billet axis is aligned with the direction of furnace gas flow. The spacing between adjacent billets is maintained at least 80mm.

[0089] Place refractory support bricks ≥50mm thick between the blank and the furnace wall to ensure smooth hot air flow and uniform heating. Make sure the furnace is clean and dry before loading.

[0090] Heating: Close the furnace door and raise the furnace temperature from room temperature to 650°C at a heating rate of 45-50°C / h, preferably 48°C / h. Below 400°C, appropriately reduce the heating rate or increase the holding time, such as holding at 350°C for 1 hour, to facilitate the full discharge of moisture and gas and reduce the risk of cracking. This can be an optimization point.

[0091] Keep at 650℃ for 2 hours. Above 650℃, increase the temperature by about 120-150℃ / h at the maximum rated power of the equipment, depending on the furnace power and furnace load, until the furnace temperature reaches 1080℃.

[0092] Keep warm: Start the keep warm timer when the furnace temperature reaches 1080℃. Use multiple thermocouples on the furnace top to monitor the temperature uniformity and adjust the burner power to strictly control the furnace temperature within the range of 1080℃±5℃.

[0093] The holding time is strictly calculated based on the thickest section of the blank to ensure that it is ≥4h. For example, for a blank with a wall thickness of 100mm, 4h of holding time is sufficient.

[0094] Unloading and quenching: 30 minutes before the end of the holding period, start the circulating cooling system and / or refrigeration system of the cooling water pool to ensure that the water temperature is stable at 30℃±5℃. Prepare a forklift.

[0095] When the holding time is up, quickly open the furnace door and the forklift operator should immediately use the forklift to steadily clamp or hook the billet and completely immerse the hot billet into the cooling water pool at the fastest speed within 30 seconds or less, and ensure that it is completely immersed in 45 seconds or less. Avoid violent collision with the pool wall or bottom during the immersion process.

[0096] Before the blank enters the water, immediately start the mechanical stirring paddle installed on the side wall of the pool or turn on a large-flow water pump to create water flow and strongly stir the water flow so that the blank is always in the violently moving water flow after entering the water.

[0097] If manual shaking is used, a long-handled tool must be used to continuously and forcefully push the blank in the water. This forced movement must continue until the blank's temperature drops to near the water temperature.

[0098] Post-cooling treatment: After the blank has completely cooled to room temperature, it can be soaked in water for ≥2 hours and then lifted out of the pool.

[0099] Immediately visually inspect the surface of the blank for cracks or severe deformation. Use a grinding wheel or shot blasting equipment to clean the surface oxide scale and water stains. Perform a Brinell hardness HBW test on the blank or sample with an expected value of ≥450HBW and a Charpy V-notch impact test with an expected value of ≥120J / cm 2 @Room temperature, metallographic examination confirms expected austenite grain size ≥ grade 7 and carbide dissolution.

[0100] Qualified blanks enter subsequent processing such as machining welding platforms and assembling wear-resistant blocks.

[0101] The poor thermal conductivity of high manganese steel during solidification easily leads to coarsening of grains, the formation of a large amount of carbides in the as-cast structure and the precipitation of more manganese oxide on the grain boundaries, which increases the tendency of hot cracking and reduces the impact toughness.

[0102] By selecting rare earth composite modifiers to modify high manganese steel, rare earth elements have a significant modifying effect on inclusions in steel, converting high-melting-point Al2 and O3 inclusions into low-melting-point rare earth aluminates or sulfur oxides, thereby reducing the harmfulness of inclusions.

[0103] The contact time between the rare earth composite treatment agent and the inclusions is longer, the modification effect is more significant, the large-sized inclusions generated are easier to float up and discharge, and the cleanliness of the molten steel is higher.

[0104] In order to avoid excessive rare earth from deteriorating the shape of inclusions, it is advisable to control the residual rare earth content to 0.05% to 0.09%.

[0105] The core innovation of the present invention is:

[0106] 1. Composition design: Based on standard high manganese steel, Cr, Ni, and Mo alloying elements are added to improve strength, toughness, and hardenability; S and P contents are strictly controlled to reduce hot brittleness; and rare earth (RE) content (0.05%-0.09%) is precisely controlled as a key modifier.

[0107] 2. Rare earth metamorphic treatment:

[0108] Timing optimization: Add the rare earth composite treatment agent when the metal level in the ladle reaches 1 / 3 to 1 / 2 of its height. This height range allows for sufficient stirring of the molten pool, ensuring rapid dissolution and uniform dispersion of the rare earth agent while promoting the effective floating of the high-melting-point deoxidation and desulfurization products generated by its reaction with dissolved oxygen and sulfur. This avoids burnout caused by adding the agent too early or uneven mixing caused by adding the agent too late. Adding the agent at 1 / 3 of its height is preferred.

[0109] Ratio optimization: A rare earth agent consisting of lanthanum (La) and cerium (Ce) in a weight ratio of 1:1.6-1.8 is used. This ratio, based on extensive practical experience, can synergistically leverage La's strong deoxidation capabilities and Ce's excellent modification (spheroidizing inclusions and refining grains) capabilities to achieve the best overall effect.

[0110] Precise Control: Strictly control the addition amount (molten metal: rare earth agent = 100: (0.2-0.6)) and the rest time (10-15 minutes) to ensure that the oxygen content after deoxidation is ≤30ppm and the final rare earth residual content is stabilized at 0.05%-0.09%. This residual range is key to ensuring sufficient deterioration while avoiding excessive rare earth from forming harmful large particle inclusions.

[0111] 3. Optimize water toughening treatment:

[0112] High temperature austenitization (1080℃±5℃): For high manganese steel containing Cr, Ni, and Mo alloying elements, the holding temperature is increased to ensure full dissolution of carbides and homogenization of austenite.

[0113] Extremely fast quenching (≤45s into water): Strictly control the time from when the billet leaves the furnace to when it is completely immersed in 30°C cooling water, to minimize the precipitation of carbides during the transfer process of high-temperature austenite, laying the foundation for obtaining a single supercooled austenite structure.

[0114] Forced hydrodynamic cooling: During the quenching process, mechanical stirring or manual shaking is used to keep the blank moving to ensure uniform cooling, significantly reduce internal stress and deformation, avoid soft spots, and ensure the consistency of the overall performance of the material.

[0115] When the wear block 22 is worn to a predetermined limit, such as when the height loss exceeds 1 / 3 of the original height or when it breaks, replace it according to the following steps:

[0116] 1. Stop the machine and ensure that the round roller body assembly 1 is fixed.

[0117] 2. Use a gas cutting gun to carefully remove the worn-out wear-resistant block 22 from the welding platform 21, taking care to avoid damaging the surface of the welding platform 21.

[0118] 3. Use an angle grinder or grinding wheel to thoroughly clean the welding slag and oxide scale remaining on the surface of the welding platform 21 until the metallic luster is exposed.

[0119] 4. Place the newly processed wear-resistant block 22 made of the same batch of high manganese steel material prepared by the above method on the cleaned welding platform 21 and adjust the position.

[0120] 5. Use preheating to about 150-200℃ and low hydrogen type welding rods such as E309LMo or special high manganese steel welding rods to make a strong peripheral fillet weld. It is recommended to weld in multiple layers and multiple passes, and control the temperature between layers to avoid overheating.

[0121] 6. After welding, cover with asbestos felt to cool slowly and check the quality of the weld. After completion, it can be put back into use.

[0122] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-quality wear-resistant round roller for a crusher, comprising a round roller body and a lifting frame (3) arranged thereon, characterized in that: The round roller body is composed of a plurality of round stick body assemblies (1), and a plurality of wear-resistant blocks (22) are detachably fixedly connected to the outer peripheral wall of the round stick body assembly (1). The wear-resistant blocks (22) are arranged on the outer peripheral wall of the round stick body assembly (1) at intervals through a welding platform (21).

2. The high-quality wear-resistant round roller for a crusher according to claim 1, characterized in that: The welding platform (21) is fixedly connected to the outer wall of the round rod body component (1), and the wear-resistant block (22) is replaceably welded to the welding platform (21).

3. A method for preparing a high-quality wear-resistant round roller for a crusher, according to any one of claims 1 and 2, characterized in that: The following steps are involved: S1: Raw material pretreatment: The chemical composition of the high-performance high-manganese steel material requires precise batching, and after mixing, it is smelted and refined to obtain molten metal, and the molten metal is deoxidized; S2: Molten metal modification and pouring: The molten metal deoxidized in S1 is transferred to a ladle. When the molten metal level in the ladle reaches 1 / 3 to 1 / 2 of the ladle height, a rare earth composite treatment agent is added to the molten metal. The rare earth composite treatment agent is composed of a mixture of lanthanide rare earth and cerium rare earth in a weight ratio of 1: (1.6-1.8), and the weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100: (0.2-0.6); After adding the rare earth composite treatment agent, let it stand for 10 to 15 minutes, and take samples to test to ensure that the dissolved oxygen content is ≤30ppm; Then, inert gas is blown into the bottom of the ladle for protection, and the ladle is poured into a mold to form a cast steel billet. S3: Water annealing: The cast steel billet is subjected to water annealing, which includes: heating the billet to 650°C at an initial rate of ≤50°C / h, then heating to 1080°C±5°C at the rated power of the heat treatment furnace, and holding the temperature for 4 hours; after the holding period, completely immersing the billet in a cooling water pool at a temperature of 30°C±5°C for ≤45 seconds; during the cooling process, the billet is kept in motion in the water by mechanical stirring or manual shaking; and the billet is removed after it is completely cooled; The residual amount of rare earth elements in the final green body is controlled at 0.05% to 0.09%.

4. The method for preparing a high-quality wear-resistant round roller for a crusher according to claim 3, characterized in that: Based on S1: The crusher uses high-quality round roller high manganese steel material, the chemical composition by mass percentage is: C: 1.0% ~ 1.20%, Si: 0.35% ~ 0.60%, Mn: 11.0% ~ 14.0%, Cr: 2.0% ~ 3.0%, Ni: 0.40% ~ 0.60%, Mo: 0.20% ~ 1.0%, S ≤ 0.035%, P ≤ 0.040%, Al ≤ 0.06%, rare earth (RE): 0.05% ~ 0.09%, the balance is Fe and unavoidable impurities; Wherein, the rare earth (RE) is mainly composed of lanthanum (La) and cerium (Ce).

5. The method for preparing a high-quality wear-resistant round roller for a crusher according to claim 3, characterized in that: Based on S1: Melting and refining treatment: medium frequency induction furnace is used for melting, the melting temperature is controlled at 1550-1600℃, alloy elements are added in batches during the melting process, and argon is introduced for stirring during the refining process.

6. The method for preparing a high-quality wear-resistant round roller for a crusher according to claim 3, characterized in that: Based on S2: When the height of the deoxidized molten metal in the ladle accounts for one-third to one-half of the ladle height, add a rare earth composite treatment agent to the molten metal to directly react with dissolved oxygen to form oxides that precipitate and float. After deoxidation, let it stand for 10 to 15 minutes and take samples to test the oxygen content ≤30ppm; The rare earth composite treatment agent is composed of a mixture of lanthanum rare earth and cerium rare earth, and the weight ratio of lanthanum rare earth to cerium rare earth is 1:1.6-1.8; The weight ratio of the deoxidized metal liquid to the rare earth composite treatment agent is 100:0.2-0.

6.

7. The method for preparing a high-quality wear-resistant round roller for a crusher according to claim 3, characterized in that: In step S3, when loading the furnace, the distance between the green bodies is kept at least 50 mm, and refractory bricks are placed between the green bodies and the furnace wall for thermal insulation; During the insulation stage, the atmosphere in the furnace is kept dry and clean; Initial heating stage: heating at an initial heating rate of 50°C / h; Medium-speed heating stage: When the temperature reaches 650℃ and is kept for 2 hours, the heating speed is based on the rated power of the heat treatment furnace; Insulation stage: The insulation time is 4 hours according to the wall thickness of the lining. During the insulation process, the temperature in the furnace is kept stable at 1080℃, and the temperature fluctuation range is controlled within ±5℃; Preparation for unloading: After the holding time is over, open the furnace door and prepare to unload the green body. Before unloading, ensure that the water temperature in the cooling water pool is controlled at 30℃. Quick immersion in water: The casting should be immersed in water for no more than 45 seconds after being taken out of the furnace, and the blank should be completely immersed in the cooling water pool; Water movement: keep the casting in motion in water, achieved by mechanical stirring or artificial shaking; Complete cooling: After the blank has completely cooled in the water, take it out of the pool.

8. The method for preparing a high-quality wear-resistant round roller for a crusher according to claim 3, characterized in that: The residual amount of rare earth is controlled at 0.05% to 0.09%.

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