CN115780025A - Grinding roller of vertical mill and preparation method thereof - Google Patents
Grinding roller of vertical mill and preparation method thereof Download PDFInfo
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- CN115780025A CN115780025A CN202211442337.9A CN202211442337A CN115780025A CN 115780025 A CN115780025 A CN 115780025A CN 202211442337 A CN202211442337 A CN 202211442337A CN 115780025 A CN115780025 A CN 115780025A
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Abstract
The invention relates to a vertical mill grinding roller and a preparation method thereof, wherein the grinding roller comprises a grinding roller base body and an insert, the insert comprises longitudinal insert strips and transverse insert strips, the longitudinal insert strips and the transverse insert strips are provided with radians attached to the outer surface of the base body, the longitudinal insert strips are uniformly distributed on the surface of the base body at intervals, a plurality of groups of transverse insert strips are uniformly distributed between every two adjacent longitudinal insert strips, the part of each insert strip, which is fused with the base body, is in an isosceles trapezoid structure, the part exposed outside the base body is in a semicircular structure, the transverse insert strips are in an equilateral triangle structure, the insert parts are made of medium chromium alloy steel, and the base body is made of high chromium alloy steel. Firstly, preparing an insert part, embedding the insert part into a casting mould of a grinding roller, pouring matrix iron liquid of the grinding roller, metallurgically combining the matrix iron liquid and the insert to obtain a grinding roller blank, and annealing, quenching and tempering to obtain a finished product. This grinding roller can increase of service life, guarantees safe in utilizationly.
Description
Technical Field
The invention relates to a grinding roller, and belongs to the technical field of metal materials and processing.
Background
In recent years, vertical mills (short for vertical mills) are increasingly applied to industries such as cement, thermal power generation and the like, grinding rollers are the most easily worn and most easily failed parts of the vertical mills, the normal operation of the vertical mills is influenced due to the easily worn and volatile effects of the grinding rollers, and the vertical mills stop operating due to the serious wear or abnormal failure of the grinding rollers, so that great economic loss is brought. Therefore, the grinding roller which is safe to use and long in service life is important to develop, the safe grinding roller can avoid frequent failure, and the economic benefit can be improved.
With regard to the material and the process of the grinding roller, a great deal of research and development work is carried out by researchers and manufacturers of related enterprises, and various grinding rollers with excellent performance are developed. For example, patent CN 111590053B discloses a method for manufacturing easily-processed and repairable high-wear-resistance metal ceramic composite grinding roller, which comprises the steps of firstly performing surface metallization pretreatment on ceramic particles, then uniformly mixing the ceramic particles with a binder, adding ceramic powder into the mixture, uniformly filling the particle mixture into a foamed ceramic mold for drying, demolding after drying out of the foamed ceramic mold to obtain a ceramic prefabricated member, and then sequentially pouring wear-resistant alloy molten metal and carbon steel molten metal to obtain a metal ceramic roller skin lining plate with three layers of ceramic prefabricated member/wear-resistant alloy/carbon steel from the vertical downward working surface. The working part of the grinding roller is made of ceramic materials, the ceramic materials have the outstanding characteristics of high hardness and poor toughness, compared with carbon steel used for the non-working surface of the grinding roller, the hardness is higher than that of the non-working surface, and the toughness is far lower than that of the non-working surface, so that the safety is not ensured in use, and the ceramic prefabricated member is easy to fall off or crack in a large area and other failure conditions because of poor toughness. In addition, it is difficult to ensure complete fusion with molten metal even though the ceramic particles are subjected to surface metallization pretreatment. In the patent, the wear-resistant alloy is made of high-chromium cast iron or high-manganese steel, the initial hardness of the high-manganese steel is about HB200, the hardness difference is too large compared with that of ceramics (the hardness of the ceramics is generally more than HB 600), and the matching is unreasonable. Patent CN 210022447U discloses a "wear-resisting roller shell for coal pulverizer," and this roller shell's main characterized in that the roller shell body is by interior inside to outside in proper order including inner liner, ceramic grained layer and cortex, and this patent main application operating mode is the coal pulverizer, and the ceramic grained layer has covered the wearing and tearing position of roller shell comprehensively, has increased substantially the life-span of roller shell. The wear part of the roller sleeve in the technology is large in area, and a large amount of ceramic materials with high hardness and low toughness are used. Patent CN111185273A provides a metal ceramic composite grinding roller and a preparation method thereof. The ceramic composite roller consists of a roller core and a high-chromium cast iron layer outside the roller core, wherein a ceramic precast block is embedded in the high-chromium cast iron layer, and the ceramic precast block is prepared from zirconia reinforced alumina ceramic. The metal ceramic composite grinding roller provided by the invention has the advantages that the roller core and the ceramic prefabricated block made of specific ceramics are infiltrated and compounded through the high-chromium cast iron layer to form an integral structure, the inner roller core is easy to process, the outer ceramic prefabricated block has the characteristic of high hardness, the wear resistance and the impact resistance are ensured, and the high-carbon ferrochrome is saved. The ceramic precast block is embedded in a high-chromium cast iron layer, high-chromium cast iron is already a brittle material, and a ceramic material with high hardness and poor toughness is embedded on the high-chromium cast iron material, so that the ceramic precast block is certainly brittle and is difficult to cope with complex working condition environments. The patent CN114939646A discloses a TiC metal ceramic particle reinforced composite wear-resistant grinding roller and a preparation process thereof, wherein the melting wetting angle of the TiC metal ceramic particles and an iron matrix is less than 30 degrees, the thermal expansion coefficient of the TiC metal ceramic particles and the alloy matrix is close, and the polarity of chemical bonds is similar, so that the TiC metal ceramic particle reinforced composite wear-resistant grinding roller has high bonding strength with the matrix, is not easy to fall off in the using process, is obviously higher than ZTA, and can be applied to the working condition with higher extrusion or impact load. The grinding roller of the invention adopts TiC metal ceramic particles and an iron matrix, and the used part is ceramic particles.
Patent CN 212943173U provides a "take roller shell of compound wear-resisting nail", and the characterized in that roller shell body surface of roller shell is provided with first wear-resisting nail and a plurality of second wear-resisting nail, and the outer terminal surface of first wear-resisting nail is the bar structure, and the exposed part of the wear-resisting nail of second is cylindrical structure, and the wear-resisting nail of second and the dislocation set of first wear-resisting nail, the beneficial technological effect of this patent is: the roller sleeve with the composite wear-resistant nails is provided with the wear-resistant nails of two structures, and the structural performance of the roller sleeve can be effectively improved. The technology only designs the roller sleeve with the structure, and the material of the roller sleeve is not specifically specified for the material of the wear-resistant nail. Patent CN110846582A discloses a 'squeeze roller sleeve in a roller press and a preparation method thereof', wherein the squeeze roller sleeve in the roller press comprises a parent body, and the exterior of the parent body consists of a deposited metal A and a deposited metal B hard alloy block. The hard alloy blocks are uniformly cast on the outer circle of the matrix in an embedding mode, the hard alloy blocks are arranged at intervals in an orderly mode in the axial direction, deposited metal A is welded in a surfacing mode in the circumferential gap of the hard alloy blocks in the axial direction, deposited metal B is welded on the upper face of the deposited metal A in a surfacing mode, and the average height of the deposited metal B is larger than the height of the hard alloy blocks. The roll sleeve of the squeeze roll greatly increases the wear resistance, prolongs the service life, and saves the cost because the roll sleeve of the squeeze roll is always in a high-efficiency state. The deposited metal B is overlaid on the deposited metal A in a surfacing mode, the average height of the deposited metal B is larger than the height of the hard alloy block, the stability of the deposited metal A and the deposited metal B is difficult to guarantee through the design, and under the condition of severe working conditions, the deposited metal A and the deposited metal B are easy to fall off, so that the failure of the roller sleeve is caused, and the normal production is seriously influenced.
In patent CN 104630610B, a super wear-resistant composite vertical mill roller sleeve and a manufacturing method thereof are invented. The super wear-resistant composite vertical mill roller sleeve comprises a double-layer structure of a super wear-resistant outer layer and a high-toughness inner layer, wherein the outer layer is carbide super wear-resistant cast iron with the content of more than 35%, the inner layer is high-toughness medium-carbon low-alloy steel, and the outer layer and the inner layer are combined together through metallurgy, so that failure modes such as block falling and peeling caused by welding microcracks are thoroughly eliminated, and the purpose of being free of maintenance for the whole life is achieved. The carbide super-wear-resistant cast iron material with the content of more than 35 percent is used, the hardness is very high, and meanwhile, the toughness is necessarily very low, so the design idea is that the working part has high hardness, and the determining factor of the toughness is ignored. Patent CN 103170392A invents a vertical mill bimetal grinding roller, is used for the vertical mill bimetal grinding roller of cement and electric power industry, including core and outer hard surface layer, core and outer hard surface layer are as an organic whole through centrifugal composite casting, and outer hard surface layer is high-speed alloy steel: 0.7-4.0% of carbon, <2% of silicon, <2% of manganese, 4-18% of chromium, 0.5-4% of nickel, 3-10% of vanadium, 2-10% of molybdenum, 0.5-7% of niobium, 0-2% of cobalt and 0.5-8% of tungsten. The technical defects are as follows: firstly, core and outer hard surface layer are as an organic whole through centrifugal composite casting, and the technology is complicated, if control is not good, probably can not obtain the better foundry goods of metallurgical combination, secondly contains a large amount of noble metal materials in the outer high-speed alloy steel, has undoubtedly increased the cost, now for the outer high-speed alloy steel that is of skin, and carbon content wherein sets up to 0.7 ~ 4.0% carbon, when carbon content reached 4%, is not the scope of steel already. In addition, the external structure of the bimetal grinding roller is not improved.
The patent CN 114086068A discloses a high-wear-resistance grinding roller and a preparation method thereof, wherein the high-wear-resistance grinding roller comprises an insert A, an insert B and a base body, the insert A and the insert B are both of rod-shaped structures with one thick end and one thin end, the rod-shaped structures are embedded in the base body, the thin end surfaces of the rod-shaped structures are exposed on the surface of the base body and the surface of the base body to form a working surface of the grinding roller, and the thin end surfaces of the insert A and the insert B are uniformly distributed on the surface of the base body in a staggered mode at intervals; the insert A is made of medium and high alloy steel, the insert B is made of ultrahigh alloy cast iron, and the matrix is made of medium alloy steel. The grinding roller has good safety and wear resistance, wide application range, difficult fracture and easy recycling. The technology has the defects that two high-hardness materials of the insert A and the insert B are still adopted at the working part, the hidden trouble of abnormal failure exists under the condition that the grinding roller is stressed excessively or is stressed unevenly, and the safe and normal operation of the grinding roller cannot be ensured.
In summary, the following disadvantages mainly exist in the prior art related to the grinding roller:
(1) In order to improve the wear resistance of products and prolong the service life of the existing grinding roller, most of the products use a prefabricated body made of ceramics or ceramics similar to the prefabricated body, the high-hardness and low-toughness material is used as the prefabricated body, the toughness of the material embedded in the design is greatly reduced compared with that of a base material although the material has higher hardness and wear resistance, and when the grinding roller and related products are used, the conditions of cracking, falling, failure and the like can occur due to low toughness, so that the products such as the grinding roller and the like fail, the normal operation of equipment cannot be ensured, and the consideration of use safety is insufficient.
(2) For the structure combining the metal insert block and the metal matrix, on one hand, the combination mode is simple physical composition, the consideration and the related factors for the chemical components of the materials of the embedded prefabricated body and the grinding roller matrix, the heat treatment process, the smelting process and the like are less, and the risk of separation exists in the use process; on the other hand, although some technologies design the appearance, the shape and the related structure size of the inlaid material, the actual design has strong subjectivity, the structure shape and other details are not accurately designed according to the use working condition of the grinding roller product, and the falling or the block falling or the cracking are often caused by the problems of uneven stress, insufficient toughness and the like locally in the use process.
Compared with a base body of the grinding roller, the local stress part of the grinding roller needs excellent toughness and hardness, and in the using process, the grinding roller is usually caused to fall off or fall into blocks or crack due to the problems of uneven stress or insufficient toughness and the like locally, so that the grinding roller is abnormally ineffective, and therefore, the development of the grinding roller material with excellent local performance is particularly important.
Disclosure of Invention
The invention aims to overcome the defects and provide the vertical grinding roller and the preparation method thereof, which can prolong the service life and ensure the use safety.
The technical scheme adopted by the invention is as follows:
the utility model provides a vertical mill grinding roller, including grinding roller base member and insert, insert including vertical insert strip and horizontal insert strip, vertical insert strip and horizontal insert strip all have the radian with the laminating of base member surface, vertical insert strip interval arrangement evenly distributed is on the base member surface, there is the horizontal insert strip evenly distributed of multiunit between two adjacent vertical insert strips, that part that each insert strip fuses with the base member (the part that imbeds in the base member promptly) all adopts the longitudinal section to be trapezoidal structure, the part that exposes outside the base member, vertical insert strip adopts the longitudinal section to be semicircular structure, horizontal insert strip adopts the longitudinal section to be equilateral triangle's structure, insert part adopt medium chromium alloy steel, the base member adopts high chromium alloy steel.
The high-chromium alloy steel material adopted by the substrate comprises the following chemical components in percentage by weight: c:1.315 to 1.429%, si:0.327 to 0.465%, mn: 0.881-0.926%, S is less than or equal to 0.026%, P is less than or equal to 0.028%, cr:13.281 to 15.197%, ni:0.621 to 0.703%, mo:0.891 to 0.923%, cu:0.627 to 0.639%, V:0.215 to 0.338%, ti: 0.0299-0.0415%, re:0.132 to 0.219%, B:0.0811 to 0.0953%, nb:0.116 to 0.178%, W:0.233 to 0.349%, zr:0.0391 to 0.0456%, al: 0.0325-0.0449%, N:0.0018 to 0.0045 percent, and the balance of Fe and impurities.
The insert part is made of medium chromium alloy steel material, and the chemical components in percentage by weight are as follows: c: 0.568-0.617%, si:0.325 to 0.457%, mn: 0.587-0.751%, S, P less than or equal to 0.025%, cr:6.155 to 6.338%, ni: 0.183-0.269%, mo:1.115 to 1.577%, cu:0.513 to 0.628%, V:1.715 to 1.747 percent, ti: 0.021-0.0315%, re:0.03 to 0.04%, B:0.0031 to 0.0039%, nb:0.268 to 0.291%, W:0.353 to 0.464%, al:0.0355 to 0.0416 percent, N:0.056 to 0.078 percent, and the balance of Fe and impurities, wherein the total amount of the impurities is less than or equal to 0.038 percent.
The longitudinal insert strip and the transverse insert strip are of an integral structure without an interface in the matrix and exposed outside the matrix. The part of each insert strip fused with the matrix preferably adopts a structure with an isosceles trapezoid longitudinal section. The part of the insert exposed outside the matrix is consistent with the part embedded in the matrix in height.
The longitudinal insert strips are in a structure with a semicircular longitudinal section, the semicircular diameter of the longitudinal insert strips is 9.6-15.8 mm, the transverse insert strips are preferably in a structure with an equilateral triangle longitudinal section, and the side length of the equilateral triangle is 9.0-15.8 mm.
The preparation method of the vertical grinding roller comprises the following steps: firstly, casting a blank of the insert part and forging and forming, embedding the insert part into a casting mold of the grinding roller according to a designed structure, pouring a base iron liquid of the grinding roller, metallurgically combining the base iron liquid and the insert to obtain a blank of the grinding roller, and annealing, quenching and tempering the blank of the grinding roller to obtain a finished product of the grinding roller.
The preparation method of the vertical grinding roller comprises the following steps:
(I) preparing an insert preform
(1) Preparing raw materials
Weighing scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferronickel, ferromolybdenum, copper, ferrovanadium, ferrotitanium, ferroboron, ferroniobium, ferrotungsten, aluminum wire, chromium nitride and rare earth ferrosilicon materials;
(2) Moulding
Molding by using a sand mold;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is according to the sequence of scrap steel, ferroalloy, scrap steel and precious metal, when molten iron reaches 1506-1557 ℃, pre-deoxidation treatment is carried out, 0.55% ferromanganese is added firstly, 0.25% ferrosilicon is added, chemical components of molten iron are assayed, the chemical components of the molten iron are adjusted by weight percentage to meet the requirements of the medium chromium alloy steel, when the temperature of the molten iron in a furnace reaches 1635-1646 ℃, 0.028% of aluminum wires are inserted, and then the molten iron is discharged;
(4) Inoculation pouring
Pouring the obtained molten iron into a casting ladle for modification inoculation, after inoculation, pouring the molten iron into a casting mold, and cooling to room temperature to obtain a blank;
(5) Forging and forming
Polishing the obtained blank, cleaning, then placing the blank into a heating furnace for heating, controlling the heating temperature to be 1066-1168 ℃, keeping the temperature for 2-2.5 hours, after keeping the temperature, placing the blank into a die for forging and forming, wherein the initial forging temperature is 1O 65-1155 ℃, the final forging temperature is not less than 898 ℃, obtaining an insert preform after forging, and cleaning and polishing the forged and formed preform again for later use;
(II) preparing the composite grinding roller
(1) Preparing raw materials
Weighing scrap steel, ferrosilicon, ferromanganese, low-carbon ferrochrome, ferronickel, ferromolybdenum, copper, electrolytic vanadium, ferrotitanium, rare earth ferrosilicon, ferroboron, ferroniobium, ferrotungsten, ferrozirconium, aluminum wire and chromium nitride material;
(2) Moulding
Placing the insert block prefabricated body into a casting mold in the process of molding to ensure that the insert block prefabricated body is uniformly distributed in the casting mold, and preheating the insert block prefabricated body to 196-265 ℃ before casting;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is carried out according to the sequence of scrap steel, iron alloy, scrap steel and precious alloy, when the temperature of molten iron reaches 1548-1565 ℃, carrying out pre-deoxidation treatment, firstly adding 0.43% of ferromanganese, then adding 0.13% of ferrosilicon, testing the chemical components of molten iron, adjusting the weight percentage of the chemical components of the molten iron to meet the requirements of the high-chromium alloy steel, when the temperature of the molten iron in a furnace reaches 1628-1635 ℃, inserting 0.023% of aluminum wires, and then discharging the molten iron;
(4) Modification inoculation pouring
Pouring the obtained iron liquid into a casting ladle for modification inoculation, drying a modification inoculant before tapping, putting the modification inoculant into the casting ladle, pouring the modification inoculant into a grinding roller casting mold, cooling to room temperature, and opening the mold;
(5) Cleaning and polishing
Removing a casting head of the obtained casting, and then cleaning and polishing to obtain a composite casting grinding roller blank;
(III) Heat treatment of grinding rolls
(1) Annealing: charging the obtained grinding roller blank and annealing;
(2) Rough machining: carrying out rough machining on the grinding roller obtained after annealing;
(3) Quenching: charging the grinding roller blank obtained by rough machining, and quenching;
(4) Tempering: re-charging the quenched casting, and carrying out tempering treatment;
(5) And finishing the tempered grinding roller.
In the preparation method, the inoculation alterant used in inoculation and pouring for preparing the insert preform comprises the following components: 0.263% ferroboron, 0.121% aluminum wire, 0.256% rare earth silicon, 0.115% silicon carbide, 0.138% ferrotitanium. The inoculation modifier used in the modification inoculation pouring for preparing the composite grinding roller is as follows: 0.453% rare earth ferrosilicon, 0.252% ferrotitanium, 0.234% chromium nitride, 0.068% ferrozirconium, and 0.245% ferroboron.
In the preparation method, the annealing treatment process in the heat treatment comprises the following steps: the temperature of the cast entering the furnace is controlled to be below 185 ℃ and below 300 ℃, the heating rate is controlled to be 29-33 ℃/hour, the temperature is kept at 300 ℃ for 1 hour and 300-650 ℃, the heating rate is controlled to be 41-53 ℃/hour, the temperature is kept at 650 ℃ for 1.5 hour and 650-1006 ℃, the heating rate is controlled to be 62-75 ℃/hour, the temperature of the cast is kept at 1106 ℃ for 3.5-5.5 hours, the temperature is properly adjusted according to the wall thickness of the cast, and the cast is cooled in the furnace along with the furnace after the temperature is kept at 1106 ℃.
The quenching treatment process comprises the following steps: controlling the charging temperature of the casting to be within 189 ℃ and within 300 ℃, controlling the heating rate to be 38-45 ℃/h, preserving heat for 1 hour at 300 ℃, controlling the heating rate to be between 300 ℃ and 650 ℃, controlling the heating rate to be 41-53 ℃/h, preserving heat for 1.5 hours at 650 ℃, controlling the heating rate to be 62-75 ℃/h, preserving heat for 3.5-4.5 hours at 1108-1110 ℃ of the casting, and properly adjusting the heat preservation time according to the wall thickness of the casting; and after heat preservation, cutting off the power, cooling along with the furnace, preserving the heat for 1.5-2.5 hours when the temperature in the furnace is reduced to 1046-1058 ℃, discharging, quenching, wherein the quenching adopts a mode of air cooling and spraying (water mist), the air cooling and spraying are started after the casting is discharged, the spraying is stopped when the temperature of the casting is reduced to be lower than 685 ℃, the air cooling is continued, the air cooling is stopped when the temperature is reduced to be lower than 550 ℃, and the air blowing is stopped, and the casting is naturally cooled in the air.
The tempering treatment process comprises the following steps: the temperature of the cast in the furnace is controlled below 188 ℃, the heating rate is controlled to be 48-51 ℃/h, and the temperature is kept for 4.5-7.5 h at 500-560 ℃. And after the heat preservation time is up, discharging, naturally cooling in the air, and tempering for 1-2 times.
The invention has the beneficial effects that:
(1) According to the grinding roller, the insert is made of medium alloy steel, the medium alloy steel is forged and then is metallurgically combined with the base body to cast a finished grinding roller, the base body is made of high-chromium alloy steel, the toughness and hardness of the insert are higher than those of the base body, and the insert has enough toughness; the insert has enough hardness and can also ensure the wear resistance of the use part; the hardness of the insert is close to that of the base material, so that the insert or the base cannot be seriously abraded in use. Therefore, the two parts are mutually crossed and supplemented, and the material selection and the structural design ensure the safety and the wear resistance.
(2) The invention designs an insert structure, an insert is cast on a substrate, longitudinal insert strips and transverse insert strips are crossed and uniformly distributed on the surface of the substrate, the longitudinal section of each longitudinal insert strip is in a semicircular design, and the longitudinal insert strips are designed to facilitate the extrusion of materials into grooves formed between the longitudinal insert strips; the longitudinal section of the transverse insert strip is designed to be an equilateral triangle, and the design of the transverse insert strip can enable materials to be extruded and crushed after entering the groove, so that the grinding and crushing efficiency is improved. When the equipment operates, the material is extruded into the groove of the grinding roller, and meanwhile, the material extruded into the groove is extruded and crushed, so that on one hand, the direct abrasion to the base material of the grinding roller is reduced by extruding the material into the groove, and on the other hand, the material is secondarily crushed by arranging the transverse insert strip in the groove as a crushing mechanism, so that the production efficiency is improved, the abrasion is reduced, and the service life of the grinding roller is prolonged.
(3) Compared with the existing ceramic-metal composite, the grinding roller disclosed by the invention can effectively avoid the conditions of fracture, block falling and the like caused by poor composite. The toughness index of the material and the process selected by the invention is far higher than that of a ceramic material, so that the absolute safety of a working part is ensured, and the conditions of falling or cracking and the like can not occur like ceramic compounding. And meanwhile, all the grinding rollers are made of metal materials, so that the used grinding rollers are more convenient to recycle. And the ceramic-metal composite grinding roller is not easy to recycle because the matrix contains a large amount of ceramics, thereby causing resource waste.
(4) The grinding roller has good safety and wear resistance after heat treatment, wherein the insert preform is made of medium chromium alloy steel (Cr 6 series), the preform is metallurgically combined with a matrix after being forged, and the performance of the insert preform after heat treatment reaches: the hardness of the matrix reaches: HRC 61-63, and the impact property reaches: (unnotched sample) 18-26 j/cm 2 . The insert block preform is used as a main working part, so that the sufficient toughness and the sufficient hardness are ensured, and the use safety of the grinding roller is ensured. The matrix is made of high-chromium cast steel (Cr 15 series), and after casting and heat treatment, the mechanical properties of the matrix can reach: hardness: HRC 58-61, impact toughness 10-16 j/cm 2 . Ensuring enough hardness to improve the wear resistance of the grinding roller. The grinding roller of the invention has 2.5 to 3 times of the single high-chromium cast iron grinding roller in wear resistance, has good market prospect,can create considerable economic benefit.
The composite grinding roller has reasonable material selection and scientific structural design, and the insert has excellent toughness and hardness, so the composite grinding roller can normally and safely operate under the working conditions of high stress and hard materials, thereby greatly reducing the accident frequency and prolonging the service life of the grinding roller.
Table 1 shows a comparison of several common grinding roller indexes
Drawings
FIG. 1 is a schematic view of a grinding roll insert distribution of the present invention;
FIG. 2 is a cross-sectional view of a grinding roll according to the invention;
FIG. 3 is a block diagram of the insert of the present invention;
FIG. 4 is a metallographic representation (100 times) of a grinding roll insert of the invention showing 4% nitrol corrosion (martensite + small amounts of retained austenite) after heat treatment;
FIG. 5 is a metallographic representation (100 times) of the base of a grinding roll according to the invention, showing 4% nitrol corrosion (martensite + carbides + small amounts of retained austenite) after heat treatment;
wherein, 1 is a longitudinal insert strip, and 2 is a transverse insert strip.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and specific embodiments.
Example 1
The utility model provides a vertical mill grinding roller, including grinding roller base member and insert, the part of inserting includes vertical insert strip 1 and horizontal insert strip 2, vertical insert strip 1 and horizontal insert strip 2 all have the radian with the laminating of base member surface, vertical insert strip interval arrangement evenly distributed is on the base member surface, there is the horizontal insert strip evenly distributed of multiunit between two adjacent vertical insert strips, that part that each insert strip fuses with the base member is whole to adopt the longitudinal section to be isosceles trapezoid's structure, the part that exposes outside the base member, vertical insert strip adopts the longitudinal section to be semicircular structure, horizontal insert strip adopts the longitudinal section to be equilateral triangle's structure, the part of inserting adopt medium chromium alloy steel, the base member adopts high chromium alloy steel. The part of the insert exposed outside the matrix is consistent with the part embedded in the matrix in height.
The preparation method comprises the following steps:
preparing an insert preform
(1) Preparing raw materials
Weighing materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferronickel, ferromolybdenum, copper, ferrovanadium, ferrotitanium, ferroboron, ferroniobium, ferrotungsten, aluminum wire, chromium nitride, rare earth ferrosilicon and the like according to the calculated weight percentage;
wherein, the alterant raw materials used when smelting the insert preform are as follows: ferroboron, aluminum wire, rare earth silicon, silicon carbide and ferrotitanium;
(2) Moulding
Molding by using a resin sand mold;
(3) Smelting of raw materials
Smelting the raw materials in the first step, wherein the smelting sequence is according to the sequence of scrap steel, ferroalloy, scrap steel and precious metal, and the precious metal is added at the later stage so as to avoid burning loss. When the temperature of the molten iron in the furnace reaches 1556 ℃, carrying out pre-deoxidation treatment, firstly adding 0.55% ferromanganese, adding 0.25% ferrosilicon after 8 minutes, testing the chemical components of the molten iron, adjusting the chemical components of the molten iron, inserting 0.028% aluminum wires when the temperature of the molten iron in the furnace reaches 1638 ℃, and then discharging;
(4) Inoculation and modification pouring
Pouring the obtained iron liquid into a casting ladle for modification inoculation, wherein the inoculation modifier comprises the following components: 0.263% ferroboron, 0.121% aluminum wire, 0.256% rare earth silicon, 0.115% silicon carbide and 0.138% ferrotitanium, wherein the alterants are dried in advance before molten iron is discharged from a furnace, uniformly mixed, placed at the bottom of a casting ladle, inoculated in molten iron, cast in a casting mold and cooled to room temperature to obtain a blank;
(5) Forging and forming
Polishing the obtained blank, cleaning, then placing the blank into a heating furnace for heating, controlling the heating temperature at 1168 ℃, keeping the temperature for 2-2.5 hours, after keeping the temperature, placing the blank into a die for forging and forming, wherein the initial forging temperature is 1155 ℃, the final forging temperature is not less than 968 ℃, obtaining an inlaid preform after forging, and cleaning and polishing the forged preform again for later use;
the prepared insert preform comprises the following chemical components in percentage by mass: c:0.617%, si:0.365%, mn:0.731%, S:0.021, P:0.025%, cr:6.338%, ni:0.259%, mo:1.577%, cu:0.593%, V:1.747%, ti:0.0315%, re:0.04%, B:0.0039%, nb:0.291%, W:0.464%, al:0.0416%, N:0.066%, the balance being Fe and impurities, and the total amount of impurities: 0.028 percent.
(II) preparing the composite grinding roller
(1) Preparing raw materials
Weighing materials such as scrap steel, ferrosilicon, ferromanganese, low-carbon ferrochrome, ferronickel, ferromolybdenum, copper, electrolytic vanadium, ferrotitanium, rare earth ferrosilicon, ferroboron, ferroniobium, ferrotungsten, ferrozirconium, aluminum wire, chromium nitride and the like.
Wherein, alterant raw materials used when smelting the grinding roller substrate are as follows: rare earth ferrosilicon, ferrotitanium, chromium nitride, ferrozirconium and ferroboron;
(2) Moulding
And placing the insert preform into the mold, wherein the insert which is finally required to be exposed outside the working surface is required to be embedded into the mold sand, and the other part is not required to be embedded into the mold. The method aims to ensure that the part which does not need to be exposed is wrapped by the alloy liquid after the alloy liquid is poured and is melted with the grinding roller base alloy liquid into a whole, the insert prefabricated body is uniformly distributed in a casting mold in the molding process, and the insert prefabricated body is preheated to 265 ℃ before pouring;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is carried out according to the sequence of scrap steel, iron alloy, scrap steel and precious alloy, when the temperature of molten iron reaches 1560 ℃, carrying out pre-deoxidation treatment, adding 0.43% ferromanganese, adding 0.13% ferrosilicon after 10 minutes, testing the chemical components of molten iron, adjusting the chemical components of the molten iron, when the temperature of the molten iron in a furnace reaches 1629 ℃, inserting 0.023% aluminum wires, and then discharging the molten iron;
(4) Inoculation and modification pouring
The obtained iron liquid is poured into a casting ladle for inoculation, and inoculation alterants comprise 0.453 percent of rare earth ferrosilicon, 0.252 percent of ferrotitanium, 0.234 percent of chromium nitride, 0.068 percent of ferrozirconium and 0.245 percent of ferroboron. Drying the inoculation alterant in advance before discharging, putting the inoculation alterant into a casting ladle, pouring the inoculation alterant into a grinding roller casting mold, cooling the inoculation alterant to room temperature, and opening the mold;
(5) Cleaning and polishing
Removing a casting head of the obtained casting, and then cleaning and polishing to obtain a composite casting grinding roller blank;
the grinding roller base body prepared comprises the following chemical components in percentage by mass: c:1.428%, si:0.435%, mn:0.881%, S:0.021%, P:0.023%, cr:15.197%, ni:0.703%, mo:0.923%, cu:0.639%, V:0.338%, ti:0.0415%, re:0.219%, B:0.0953%, nb:0.178%, W:0.349%, zr:0.0456%, al:0.0325%, N:0.0045 percent, and the balance of Fe and impurities.
(III) Heat treatment of grinding rolls
(1) Annealing of
The obtained grinding roller blank is subjected to furnace charging, annealing treatment and annealing treatment processes: controlling the temperature of the cast in the furnace to be below 185 ℃ and below 300 ℃, controlling the heating rate to be 33 ℃/h, keeping the temperature at 300 ℃ for 1 h, between 300 ℃ and 650 ℃, controlling the heating rate to be 53 ℃/h, keeping the temperature at 650 ℃ for 1.5 h, between 650 ℃ and 1106 ℃, controlling the heating rate to be 75 ℃/h, keeping the temperature of the cast at 1106 ℃ for 5.5 h, keeping the temperature at 1106 ℃, and cooling the cast in the furnace along with the furnace after keeping the temperature;
(2) Roughing
Roughly processing the grinding roller obtained after annealing according to a drawing;
(3) Quenching
Charging a grinding roller blank obtained by rough machining, quenching, wherein the quenching process comprises the following steps: controlling the charging temperature of the casting within 189 ℃ and 300 ℃, controlling the heating rate at 45 ℃/h, keeping the temperature at 300 ℃ for 1 h, between 300 ℃ and 650 ℃, controlling the heating rate at 53 ℃/h, keeping the temperature at 650 ℃ for 1.5 h, between 650 ℃ and 1020 ℃, controlling the heating rate at 75 ℃/h, keeping the temperature of the casting at 1110 ℃ for 4.5 h, and properly adjusting the heat-preservation time according to the wall thickness of the casting; after heat preservation, cutting off power, cooling along with the furnace, preserving heat for 2.5 hours when the temperature in the furnace is reduced to 1058 ℃, discharging, quenching, wherein the quenching adopts a mode of air cooling and spraying (water mist), after the casting is discharged, air cooling and spraying are started, spraying is stopped when the temperature of the casting is reduced to be lower than 685 ℃, air cooling is continued, air blowing is stopped when the temperature is reduced to be lower than 550 ℃, and air is naturally cooled;
(4) Tempering
And (3) re-charging the quenched casting, and carrying out tempering and tempering processes: the temperature of the cast in the furnace is controlled below 188 ℃, the heating rate is controlled at 51 ℃/h, and the temperature is kept at 560 ℃ for 7.5 h. After the heat preservation time is up, discharging, naturally cooling in air, and tempering for 2 times;
(5) Finish machining
Finely processing the tempered grinding roller according to the requirements of a drawing;
(6) Quality detection
Carrying out hardness, impact toughness and ultrasonic flaw detection on the finished grinding roller;
the sample is subjected to heat treatment along with the casting, and the mechanical properties of the grinding roller substrate are as follows: impact properties (no specimen notch): 11j/cm 2 HRC59.5. The insert has the following mechanical properties: impact toughness (unnotched sample) 23.5j/cm 2 ，HRC62；
(7) Packaging and warehousing
And packaging and warehousing grinding roller finished products meeting the drawing requirements.
Example 2
The utility model provides a vertical mill grinding roller, including grinding roller base member and insert, the part of inserting includes vertical insert strip 1 and horizontal insert strip 2, vertical insert strip 1 and horizontal insert strip 2 all have the radian with the laminating of base member surface, vertical insert strip interval arrangement evenly distributed is on the base member surface, there is the horizontal insert strip evenly distributed of multiunit between two adjacent vertical insert strips, that part that each insert strip fuses with the base member is whole to adopt the longitudinal section to be isosceles trapezoid's structure, the part that exposes outside the base member, vertical insert strip adopts the longitudinal section to be semicircular structure, horizontal insert strip adopts the longitudinal section to be equilateral triangle's structure, the part of inserting adopt medium chromium alloy steel, the base member adopts high chromium alloy steel. The part of the insert exposed outside the matrix is consistent with the part embedded in the matrix in height.
The preparation method comprises the following steps:
preparing an insert preform
(1) Preparing raw materials
Weighing materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferronickel, ferromolybdenum, copper, ferrovanadium, ferrotitanium, ferroboron, ferroniobium, ferrotungsten, aluminum wire, chromium nitride, rare earth ferrosilicon and the like according to the calculated weight percentage;
wherein, alterant raw materials used when smelting the inlaid preform are as follows: ferroboron, aluminum wire, rare earth silicon, silicon carbide and ferrotitanium;
(2) Moulding
Molding by utilizing a resin sand mold;
(3) Smelting of raw materials
The raw materials are smelted according to the sequence of scrap steel, ferroalloy, scrap steel and precious metal, and the precious metal is added at the later stage so as to avoid burning loss. When the temperature of the molten iron in the furnace reaches 1630 ℃, inserting 0.028% of aluminum wires, and then discharging the molten iron;
(4) Inoculation pouring
Pouring the obtained iron liquid into a casting ladle for modification inoculation, wherein the modifier comprises the following components: 0.263% ferroboron, 0.121% aluminum wire, 0.256% rare earth silicon, 0.115% silicon carbide and 0.138% ferrotitanium, wherein the alterants are dried and mixed in advance before molten iron is discharged from a furnace, the alterants are put at the bottom of a casting ladle, the molten iron is inoculated and then cast in a casting mold, and the casting mold is cooled to room temperature to obtain a blank;
(5) Forging and forming
Polishing the obtained blank, cleaning, then placing the blank into a heating furnace for heating, controlling the heating temperature at 1118 ℃, keeping the temperature for 2.5 hours, after keeping the temperature, placing the blank into a die for forging and forming, wherein the initial forging temperature is 1110 ℃, the final forging temperature is more than or equal to 988 ℃, obtaining an embedded prefabricated body after forging, and cleaning and polishing the prefabricated body after forging and forming again for later use;
the prepared insert preform comprises the following chemical components in percentage by mass: c:0.598%, si:0.425%, mn:0.628%, S:0.021%, P:0.021%, cr:6.238%, ni:0.239%, mo:1.437%, cu:0.528%, V:1.726%, ti:0.0235%, re:0.031%, B:0.0036%, nb:0.288%, W:0.398%, al:0.0395%, N:0.066%, and the balance of Fe and impurities.
(II) preparing the composite grinding roller
(1) Preparing raw materials
Weighing materials such as scrap steel, ferrosilicon, ferromanganese, low-carbon ferrochrome, ferronickel, ferromolybdenum, copper, electrolytic vanadium, ferrotitanium, rare earth ferrosilicon, ferroboron, ferroniobium, ferrotungsten, ferrozirconium, aluminum wire, chromium nitride and the like;
wherein, alterant raw materials used when smelting the grinding roller substrate are as follows: rare earth ferrosilicon, ferrotitanium, chromium nitride, ferrozirconium and ferroboron;
(2) Moulding
Placing the insert prefabricated body into a casting mold, wherein the insert which is finally required to be exposed out of the working surface is required to be embedded into casting mold sand, and the other part is not required to be embedded into the casting mold; the aim is that after the alloy liquid is poured, the part which does not need to be exposed is wrapped by the alloy liquid and is melted with the alloy liquid of the grinding roller matrix into a whole; in the molding process, the insert preforms are ensured to be uniformly distributed in the casting mold; preheating an insert preform to 245 ℃ before casting;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is carried out according to the sequence of scrap steel, ferroalloy, scrap steel and precious alloy, when the temperature of molten iron reaches 1550 ℃, carrying out pre-deoxidation treatment, adding 0.43% ferromanganese, adding 0.13% ferrosilicon after 10 minutes, testing the chemical components of molten iron, adjusting the chemical components of the molten iron, when the temperature of the molten iron in a furnace reaches 1630 ℃, inserting 0.023% aluminum wires, and then discharging the molten iron; (4) Pouring with metamorphic inoculation
Pouring the obtained iron liquid into a ladle for modification inoculation, wherein the modification inoculant comprises 0.453% of rare earth ferrosilicon, 0.252% of ferrotitanium, 0.234% of chromium nitride, 0.068% of ferrozirconium and 0.245% of ferroboron. The modification inoculant is dried in advance before being taken out of the furnace, is put into a casting ladle, is poured into a grinding roller casting mold, is cooled to room temperature and is unpacked;
(5) Cleaning and polishing
Removing a casting head of the obtained casting, and then cleaning and polishing to obtain a composite casting grinding roller blank;
the grinding roller substrate prepared comprises the following chemical components in percentage by mass: c:1.315%, si:0.327%, mn:0.881%, S:0.022%, P:0.023%, cr:13.281%, ni:0.621%, mo:0.891%, cu:0.627%, V:0.215%, ti:0.0299%, re:0.132%, B:0.0811%, nb:0.116%, W:0.233%, zr:0.0391%, al:0.0325%, N:0.0018 percent, and the balance of Fe and impurities.
(III) Heat treatment of grinding rolls
(1) Annealing
The obtained grinding roller blank is subjected to furnace charging, annealing treatment and annealing treatment processes: the temperature of the casting entering the furnace is controlled below 185 ℃ and below 300 ℃, the heating rate is controlled at 33 ℃/h, the temperature is kept at 300 ℃ for 1 h and 300-650 ℃, the heating rate is controlled at 53 ℃/h, the temperature is kept at 650 ℃ for 1.5 h and 650-1100 ℃, the heating rate is controlled at 75 ℃/h, and the temperature of the casting is kept at 1100 ℃ for 5.5 h. After the temperature is kept at 1100 ℃, cooling in the furnace along with the furnace;
(2) Roughing
Roughly processing the grinding roller obtained after annealing according to a drawing;
(3) Quenching
The grinding roller blank obtained by rough machining is subjected to charging and quenching treatment, and the quenching treatment process comprises the following steps: controlling the temperature of the cast in the furnace to be 189 ℃, controlling the heating rate to be 45 ℃/h within 300 ℃ after the cast is put in the furnace, keeping the temperature at 300 ℃ for 1 h, between 300 and 650 ℃, controlling the heating rate to be 53 ℃/h, keeping the temperature at 650 ℃ for 1.5 h, between 650 and 1110 ℃, controlling the heating rate to be 75 ℃/h, keeping the temperature of the cast at 1110 ℃ for 4.5 h, and properly adjusting the heat preservation time according to the wall thickness of the cast; after heat preservation, cutting off power, cooling along with the furnace, preserving heat for 2.5 hours when the temperature in the furnace is reduced to 1056 ℃, discharging, quenching, wherein the quenching adopts a mode of air cooling and spraying (water mist), after the casting is discharged, air cooling and spraying are started, spraying is stopped when the temperature of the casting is reduced to be lower than 685 ℃, air cooling is continued, air blowing is stopped when the temperature is reduced to be lower than 550 ℃, and air is naturally cooled;
(4) Tempering
And (3) re-charging the quenched casting, and carrying out tempering and tempering processes: controlling the charging temperature of the casting below 188 ℃, controlling the heating rate at 51 ℃/h, preserving heat for 7.5 h at 555 ℃, discharging the casting after the heat preservation time is up, naturally cooling in the air, and tempering for 2 times;
(5) Finish machining
Finely processing the tempered grinding roller according to the requirements of a drawing;
(6) Quality detection
Carrying out hardness, impact toughness and ultrasonic flaw detection on the finished grinding roller;
the sample is subjected to heat treatment along with the casting, and the mechanical properties of the grinding roller matrix are as follows: impact properties (test specimens without notches): 12j/cm 2 HRC60. The insert has the following mechanical properties: impact toughness (unnotched sample) 22.5j/cm 2 ，HRC61.5；
(7) Packaging and warehousing
And packaging and warehousing the grinding roller finished products meeting the drawing requirements.
Example 3
The structure and the preparation method steps are the same as those of example 2, except that the chemical composition of the grinding roller substrate is as follows:
(1) The grinding roller substrate comprises the following chemical components in percentage by weight: c:1.388%, si:0.427%, mn:0.893%, S:0.021%, P:0.021%, cr:14.281%, ni:0.665%, mo:0.891%, cu:0.629%, V:0.225%, ti:0.0415%, re:0.182%, B:0.0811%, nb:0.156%, W:0.349%, zr:0.0391%, al:0.0325%, N:0.0028%, and the balance of Fe and impurities.
(2) The mechanical property indexes of the grinding roller matrix after heat treatment are as follows: impact properties (test specimens without notches): 13j/cm 2 ，HRC59.5。
(3) The insert had the same chemical composition and mechanical properties as in example 2.
Example 4
The procedure of the preparation method was the same as in example 2, except for the chemical composition of the grinding roller base.
(1) The grinding roller base body comprises the following chemical components in percentage by weight: c:1.355%, si:0.427%, mn:0.889%, S:0.021%, P:0.021%, cr:14.556%, ni:0.671%, mo:0.923%, cu:0.637%, V:0.338%, ti:0.0299%, re:0.136%, B:0.0811%, nb:0.136%, W:0.233%, zr:0.0391%, al:0.0375%, N:0.0038 percent, and the balance of Fe and impurities.
(2) The mechanical property indexes of the grinding roller matrix after heat treatment are as follows: impact properties (no specimen notch): 10.5j/cm 2 ，HRC61。
(3) The insert had the same chemical composition and mechanical properties as in example 2.
Example 5
The procedure was the same as in example 2, except for the chemical composition of the grinding roll base body.
(1) The grinding roller base body comprises the following chemical components in percentage by weight: c:1.365%, si:0.455%, mn:0.886%, S:0.022%, P:0.023%, cr:15.111%, ni:0.621%, mo:0.923%, cu:0.637%, V:0.265%, ti:0.0299%, re:0.219%, B:0.0953%, nb:0.116%, W:0.233%, zr:0.0391%, al:0.0325%, N:0.0035 percent, and the balance of Fe and impurities.
(2) The mechanical property indexes of the grinding roller matrix after heat treatment are as follows: impact properties (no specimen notch): 12.5j/cm 2 ，HRC60。
(3) The insert had the same chemical composition and mechanical properties as in example 2.
Example 6
The procedure of the preparation method was the same as in example 2, except for the chemical composition of the grinding roll base and the chemical composition of the insert.
(1) The grinding roller substrate comprises the following chemical components in percentage by weight: c:1.386%, si:0.442%, mn:0.899%, S:0.021%, P0.023%, cr:14.355%, ni:0.699%, mo:0.911%, cu:0.628%, V:0.331%, ti:0.0299%, re:0.136%, B:0.0811%, nb:0.166%, W:0.349%, zr:0.0456%, al:0.0325%, N:0.0018 percent, and the balance of Fe and impurities.
(2) The insert comprises the following chemical components in percentage by weight: c:0.611%, si:0.421%, mn:0.588%, S:0.021%, P0.024%, cr:6.186%, ni:0.198%, mo:1.115%, cu:0.513%, V:1.726%, ti:0.029%, re:0.031%, B:0.0031%, nb:0.268%, W:0.353%, al:0.0355%, N:0.056 percent and the balance of Fe and impurities.
(3) Mechanical property indexes of the grinding roller substrate after heat treatment are as follows: impact properties (no specimen notch): 13.5j/cm 2 ，HRC60.5。
(4) The mechanical property indexes of the insert after heat treatment are as follows: impact properties (no specimen notch): 19.5j/cm 2 ，HRC62。
The present invention has been described in detail with reference to the specific embodiments, but the scope of the present invention is not limited thereto.
Claims (10)
1. The utility model provides a vertical mill grinding roller, includes the grinding roller base member and inserts, characterized by, insert including vertical insert strip and horizontal insert strip, vertical insert strip and horizontal insert strip all have the radian of laminating with the substrate surface, vertical insert strip interval arrangement evenly distributed is on the substrate surface, there is the horizontal strip evenly distributed of inserting of multiunit between two adjacent vertical insert strips, that part that each insert strip fuses with the base member all adopts the longitudinal section to be trapezoidal structure, the part that exposes outside the base member, vertical insert strip adopts the longitudinal section to be semicircular structure, horizontal insert strip adopts the longitudinal section to be triangular structure, the part of inserting adopt the medium chromium alloy steel, the base member adopts high chromium alloy steel.
2. The grinding roller of a vertical mill according to claim 1, wherein the substrate is made of high chromium alloy steel materials, and the chemical components by weight percentage are as follows: c:1.315 to 1.429%, si:0.327 to 0.465%, mn: 0.881-0.926%, S is less than or equal to 0.026%, P is less than or equal to 0.028%, cr:13.281 to 15.197%, ni:0.621 to 0.703%, mo:0.891 to 0.923%, cu: 0.627-0.639%, V:0.215 to 0.338%, ti:0.0299 to 0.0415%, re:0.132 to 0.219%, B:0.0811 to 0.0953%, nb:0.116 to 0.178%, W:0.233 to 0.349%, zr:0.0391 to 0.0456%, al: 0.0325-0.0449%, N:0.0018 to 0.0045 percent, and the balance of Fe and impurities.
3. The grinding roller of a vertical mill according to claim 1, wherein the insert part is made of a medium chromium alloy steel material, and the medium chromium alloy steel material comprises the following chemical components in percentage by weight: c: 0.568-0.617%, si:0.325 to 0.457%, mn: 0.587-0.751%, S, P less than or equal to 0.025%, cr:6.155 to 6.338%, ni: 0.183-0.269%, mo:1.115 to 1.577%, cu:0.513 to 0.628%, V:1.715 to 1.747 percent, ti:0.021 to 0.0315%, re:0.03 to 0.04%, B:0.0031 to 0.0039%, nb:0.268 to 0.291%, W:0.353 to 0.464%, al: 0.0355-0.0416%, N:0.056 to 0.078 percent, and the balance of Fe and impurities, wherein the total amount of the impurities is less than or equal to 0.038 percent.
4. The grinding roll of claim 1, wherein the longitudinal insert strips and the transverse insert strips are integrally formed without an interface in the substrate and exposed outside the substrate, and the portions of the insert strips, which are fused with the substrate, are of an isosceles trapezoid-shaped longitudinal section.
5. A grinding roller for a vertical mill according to claim 1 or 4, wherein the longitudinal insert strips are of a semi-circular configuration in longitudinal section, the semi-circular diameter being 9.6 to 15.8mm, and the transverse insert strips are of an equilateral triangle configuration in longitudinal section, the sides of the equilateral triangle being 9.0 to 15.8mm.
6. A method for manufacturing a grinding roller of a vertical mill as defined in any one of claims 1 to 5, characterized in that the method comprises the steps of casting a blank of the insert portion and forging the blank, embedding the insert portion into a mold of the grinding roller in accordance with a designed structure, pouring a base iron liquid of the grinding roller, metallurgically combining the base iron liquid and the insert to obtain a blank of the grinding roller, and annealing, quenching and tempering the blank of the grinding roller to obtain a finished product of the grinding roller.
7. The method for preparing the grinding roller of the vertical mill according to claim 6, which is characterized by comprising the following steps:
preparing an insert preform
(1) Preparing raw materials
Weighing scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferronickel, ferromolybdenum, copper, ferrovanadium, ferrotitanium, ferroboron, ferroniobium, ferrotungsten, aluminum wire, chromium nitride and rare earth ferrosilicon materials;
(2) Moulding
Molding by using a sand mold;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is according to the sequence of scrap steel, ferroalloy, scrap steel and precious metal, when molten iron reaches 1506-1557 ℃, pre-deoxidation treatment is carried out, 0.55% ferromanganese is added firstly, 0.25% ferrosilicon is added, chemical components of molten iron are assayed, the chemical components of the molten iron are adjusted by weight percentage to meet the requirements of the medium chromium alloy steel, when the temperature of the molten iron in a furnace reaches 1635-1646 ℃, 0.028% of aluminum wires are inserted, and then the molten iron is discharged;
(4) Inoculation pouring
Pouring the obtained molten iron into a casting ladle for modification inoculation, after inoculation, pouring the molten iron into a casting mold, and cooling to room temperature to obtain a blank;
(5) Forging and forming
Polishing the obtained blank, cleaning, then placing the blank into a heating furnace for heating, controlling the heating temperature to be 1066-1168 ℃, keeping the temperature for 2-2.5 hours, after keeping the temperature, placing the blank into a die for forging and forming, wherein the initial forging temperature is 1O 65-1155 ℃, the final forging temperature is not less than 898 ℃, obtaining an insert preform after forging, and cleaning and polishing the forged and formed preform again for later use;
(II) preparing the composite grinding roller
(1) Preparing raw materials
Weighing scrap steel, ferrosilicon, ferromanganese, low-carbon ferrochrome, ferronickel, ferromolybdenum, copper, electrolytic vanadium, ferrotitanium, rare earth ferrosilicon, ferroboron, ferroniobium, ferrotungsten, ferrozirconium, aluminum wire and chromium nitride material;
(2) Moulding
Putting the insert block preform into a casting mold in the molding process to ensure that the insert block preform is uniformly distributed in the casting mold, and preheating the insert block preform to 196-265 ℃ before casting;
(3) Smelting of raw materials
Smelting raw materials, wherein the smelting sequence is carried out according to the sequence of scrap steel, iron alloy, scrap steel and precious alloy, when the temperature of molten iron reaches 1548-1565 ℃, carrying out pre-deoxidation treatment, firstly adding 0.43% of ferromanganese, then adding 0.13% of ferrosilicon, testing the chemical components of molten iron, adjusting the weight percentage of the chemical components of the molten iron to meet the requirements of the high-chromium alloy steel, when the temperature of the molten iron in a furnace reaches 1628-1635 ℃, inserting 0.023% of aluminum wires, and then discharging the molten iron;
(4) Modification inoculation pouring
Pouring the obtained iron liquid into a casting ladle for modification inoculation, drying a modification inoculant before tapping, putting the modification inoculant into the casting ladle, pouring the modification inoculant into a grinding roller casting mold, cooling to room temperature, and opening the mold;
(5) Cleaning and grinding
Removing a casting head of the obtained casting, and then cleaning and polishing to obtain a composite casting grinding roller blank;
(III) Heat treatment of grinding rolls
(1) Annealing: charging the obtained grinding roller blank and carrying out annealing treatment;
(2) Rough machining: roughly machining the grinding roller obtained after annealing according to a drawing;
(3) Quenching: charging the grinding roller blank obtained by rough machining, and quenching;
(4) Tempering: re-charging the quenched casting, and carrying out tempering treatment;
(5) And finishing the tempered grinding roller.
8. The method for preparing a grinding roller of a vertical mill according to claim 7, wherein the inoculation modifier used in the inoculation casting for preparing the insert preform is: 0.263% ferroboron, 0.121% aluminum wire, 0.256% rare earth silicon, 0.115% silicon carbide, 0.138% ferrotitanium; the inoculation alterant used in the inoculation and pouring for preparing the composite grinding roller comprises the following components: 0.453% rare earth ferrosilicon, 0.252% ferrotitanium, 0.234% chromium nitride, 0.068% ferrozirconium, and 0.245% ferroboron.
9. The method for preparing the grinding roller of the vertical mill according to claim 7, wherein the annealing treatment process in the heat treatment comprises the following steps: the temperature of the casting entering the furnace is controlled below 185 ℃ and below 300 ℃, the heating rate is controlled between 29 ℃/h and 33 ℃/h, the temperature is kept at 300 ℃ for 1 hour and between 300 ℃ and 650 ℃, the heating rate is controlled between 41 ℃/h and 53 ℃/h, the temperature is kept at 650 ℃ for 1.5 hour and between 650 ℃ and 1006 ℃, the heating rate is controlled between 62 ℃/h and 75 ℃/h, the temperature of the casting is kept at 1106 ℃ for 3.5 to 5.5 hours, the wall thickness of the casting is properly adjusted, and the casting is cooled in the furnace along with the furnace after the temperature is kept at 1106 ℃.
10. The method for preparing the grinding roller of the vertical mill according to claim 7, wherein the quenching treatment process comprises the following steps: controlling the charging temperature of the casting to be within 189 ℃ and within 300 ℃, controlling the heating rate to be 38-45 ℃/h, preserving heat for 1 hour at 300 ℃, controlling the heating rate to be between 300 ℃ and 650 ℃, controlling the heating rate to be 41-53 ℃/h, preserving heat for 1.5 hours at 650 ℃, controlling the heating rate to be 62-75 ℃/h, preserving heat for 3.5-4.5 hours at 1108-1110 ℃ of the casting, and properly adjusting the heat preservation time according to the wall thickness of the casting; and after heat preservation, cutting off the power, cooling along with the furnace, preserving the heat for 1.5-2.5 hours when the temperature in the furnace is reduced to 1046-1058 ℃, discharging, quenching, and cooling by adopting an air cooling and spraying mode, starting the air cooling and spraying after the casting is discharged, stopping spraying when the temperature of the casting is reduced to be lower than 685 ℃, continuing air cooling, cooling to be lower than 550 ℃, stopping blowing, and naturally cooling in the air.
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| CN117399568A (en) * | 2023-12-14 | 2024-01-16 | 山东硕源工业机械设备有限公司 | Large wear-resistant embedded hard alloy roller sleeve and one-step molding manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117399568A (en) * | 2023-12-14 | 2024-01-16 | 山东硕源工业机械设备有限公司 | Large wear-resistant embedded hard alloy roller sleeve and one-step molding manufacturing method thereof |
| CN117399568B (en) * | 2023-12-14 | 2024-02-23 | 山东硕源工业机械设备有限公司 | Large wear-resistant embedded hard alloy roller sleeve and one-step molding manufacturing method thereof |
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