CN113667898A - High-vanadium high-speed steel composite roller and manufacturing method thereof - Google Patents
High-vanadium high-speed steel composite roller and manufacturing method thereof Download PDFInfo
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- CN113667898A CN113667898A CN202111021896.8A CN202111021896A CN113667898A CN 113667898 A CN113667898 A CN 113667898A CN 202111021896 A CN202111021896 A CN 202111021896A CN 113667898 A CN113667898 A CN 113667898A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/10—Repairing defective or damaged objects by metal casting procedures
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
Abstract
The invention provides a high-vanadium high-speed steel composite roller and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: the roller comprises a roller working layer and a roller core roller shaft, wherein the roller working layer is made of high-vanadium high-speed steel, and the high-vanadium high-speed steel comprises the following chemical components in percentage by weight: 1.5 to 2.2 percent of C, 0.8 to 1.6 percent of Si, 0.5 to 1.0 percent of Mn, 4.0 to 7.0 percent of Cr, 3.0 to 6.0 percent of Mo, 8.0 to 12.0 percent of V, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S and the balance of Fe. The high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the invention realize casting production of the high-vanadium high-speed steel composite roll and break through the production mode that only powder sintering is used. Due to the increase of the V element and the carbide thereof, the wear resistance of the roller is improved, and the service life of the roller is prolonged; the roller core adopts a short-flow process technology of remanufacturing waste rollers, so that the production cost of the manufactured roller is greatly reduced; the roller core adopts the waste roller remanufacturing short-flow process technology, so that the smelting and spheroidizing processes of the nodular cast iron molten iron at the core are omitted, the energy consumption is reduced, and the pollution to the atmospheric environment is reduced.
Description
Technical Field
The invention relates to the technical field of roller manufacturing, in particular to a high-vanadium high-speed steel composite roller and a manufacturing method thereof.
Background
The rolling mill is important equipment in metal rolling production and is a remarkable mark for measuring the technical level of steel development in one region. The roller is also a main component of the rolling mill, is a key part which is consumed in large quantity in steel rolling production, and is a basic guarantee for determining the development level of rolling technology in a region, and the quality of the roller not only influences the surface quality of a rolled material, but also influences the operation rate of the rolling mill, and directly restricts the economic benefit of enterprises.
The consumption of steel rolls per ton in the current steel rolling industry is around 0.8kg/T, which means that a total of up to 100 ten thousand tons of rolls are consumed per year. According to the requirements of rolling production, the roller has high wear resistance, good thermal crack resistance and good peeling resistance, and simultaneously, the roller shaft of the roller core is required to have high strength and is continuously rolled in the using process. The high-speed steel composite roller is generally adopted and advocated by the steel rolling industry due to high hardness, good wear resistance and excellent use effect, and particularly, the high-speed steel roller is applied to a bar and wire rolling mill to create a new bar rolling era due to excellent comprehensive performance. However, in the prior art of high-speed steel roll production, such as ZL 97100083.2 technology, the content of wear-resistant element V cannot be added too high due to component segregation caused by the action of centrifugal gravity field, and the adding amount of V is generally controlled below 6%. Metal V and its carbides are known for high wear resistance and high vanadium high speed steel rolls are usually produced and applied by powder metallurgy sintering because the density of V is 6.1kg dm 3, the density of VC is 5.7kg dm 3, and the lower density elements of V and its carbides are heavily agglomerated towards the inner surface of the working layer of the roll under the action of centrifugal gravitational field.
When the addition of V is more than 8 percent, the content of V on the inner surface of the working layer of the centrifugally cast high-vanadium high-speed steel composite roll reaches about 40 percent, the content of V on the outer surface of the working layer of the roll is reduced to below 3 percent, and serious unevenness and segregation are generated on the alloy content and the structure in the whole working layer of the roll, so that the centrifugally cast high-vanadium high-speed steel composite roll is difficult to realize in production.
Therefore, it is necessary to provide a high-vanadium high-speed steel composite roll and a manufacturing method thereof to solve the above technical problems.
Disclosure of Invention
The invention provides a high-vanadium high-speed steel composite roller and a manufacturing method thereof, which solve the technical problems that the V content of the outer surface of a roller working layer is reduced to be below 3%, and the alloy content and the structure in the whole working layer of the roller are seriously uneven and segregated, so that the centrifugal casting of the high-vanadium high-speed steel composite roller is difficult to realize in production.
In order to solve the technical problems, the invention provides a high-vanadium high-speed steel composite roller and a manufacturing method thereof, wherein the manufacturing method comprises the following steps:
the roller comprises a roller working layer and a roller core roller shaft, wherein the roller working layer is made of high-vanadium high-speed steel, and the high-vanadium high-speed steel comprises the following chemical components in percentage by weight: 1.5 to 2.2 percent of C, 0.8 to 1.6 percent of Si, 0.5 to 1.0 percent of Mn, 4.0 to 7.0 percent of Cr, 3.0 to 6.0 percent of Mo, 8.0 to 12.0 percent of V, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S and the balance of Fe.
Preferably, the formula of the high-vanadium high-speed steel material for the roller working layer is as follows: 1.99% of C, 0.85% of Si, 0.65% of Mn, 4.12% of Cr4, 4.19% of Mo, 9.89% of V, 0.029% of P, 0.026% of S and the balance of Fe.
Preferably, the formula of the high-vanadium high-speed steel material for the roller working layer is as follows: 1.55% of C, 0.92% of Si, 0.95% of Mn, 6.80% of Cr, 5.33% of Mo, 8.25% of V, 0.023% of P, 0.021% of S and the balance of Fe.
Preferably, the formula of the high-vanadium high-speed steel material for the roller working layer is as follows: 2.16% of C, 0.82% of Si, 0.91% of Mn, 5.09% of Cr, 5.81% of Mo, 11.65% of V, 0.025% of P, 0.025% of S and the balance of Fe.
Preferably, the formula of the high-vanadium high-speed steel material for the roller working layer is as follows: 1.87% of C, 1.05% of Si, 0.78% of Mn, 5.93% of Cr, 4.89% of Mo, 9.05% of V, 0.033% of P, 0.028% of S and the balance of Fe.
A manufacturing method of a high-vanadium high-speed steel composite roller comprises the following steps:
s1, waste collection: the diameter and the length of the waste roller used in the steel mill are more than 10mm larger than those of the roller neck of the roller to be remanufactured. The influence of oxidation and deformation on the processing amount of the two ends of the roller shaft during the later quenching of the high-vanadium high-speed steel roller is met;
s2, waste pretreatment: turning to remove the residual part of the used outer layer of the roll body of the old roll to form a complete roll core part roll shaft; in order to better compound the high-vanadium high-speed steel molten metal and the roll shaft, the compound surface of the roll shaft is processed into a tooth shape, the tooth height is controlled to be 3-10mm, and the tooth pitch width is not limited;
s3, processing waste materials: the roll shaft is placed in a resistance furnace and heated to a certain temperature, the surface temperature and the internal heat storage capacity of the roll shaft are ensured, and a bottom box, a cope box and a pouring cup for casting are baked and dried;
s4, preparing composite pouring: before the high-vanadium high-speed molten steel on the roller working layer is poured, firstly, a bottom box is laid flat, a sizing block is arranged in the middle of the bottom box and used for placing and positioning a roller shaft, then, an upper sand box is assembled, the roller shaft is lifted out of a furnace, a dust removal device is used for removing floating dust on the surface and then immediately placed into the sand box, a pre-prefabricated sand core protection is sleeved on a roller neck part at the upper end of the roller shaft, and each part is compacted and then poured;
s5, composite pouring: and melting the high-vanadium high-speed molten steel on the working layer of the roller by using an intermediate frequency electric furnace, tapping and slagging off when the components and the temperature of the high-vanadium high-speed molten steel meet preset requirements, pouring the molten steel into a casting mold after mold closing by adopting a bottom pouring static pouring mode, and then cooling and forming to finally obtain the manufactured composite roller. Because the roller is a cylinder, when in pouring, the high-vanadium high-speed molten steel enters the liquid level in the casting mould from the tangent pouring gate and rotates and stably rises, the control of the instantaneous equilibrium temperature of the contact surface of the high-vanadium high-speed molten steel and the roller shaft can melt the surface of the roller shaft, and a large amount of alloy in the high-vanadium high-speed molten steel can not be diffused into the roller shaft, so that the melt compounding of the liquid high-vanadium high-speed molten steel and the solid nodular cast iron is realized. The liquid level height generally exceeds 300-600mm of the top of the tooth surface of the roll shaft according to the size of the roll so as to ensure that sufficient feeding amount and a space for floating and remaining slag in the high-vanadium high-speed molten steel are reserved.
Preferably, the casting temperature of the high-vanadium high-speed molten steel in S5 is 1550-.
Preferably, the resistance furnace in S3 is heated to 750-.
Preferably, the dust removal device used in S4 includes a base, the both sides at base top are all fixedly connected with support frame, two fixedly connected with roof between the relative one side of support frame, the top of roof is provided with the dust catcher.
Preferably, the bottom fixedly connected with of roof is used for the cylinder bucket of placing to the roller, the sliding tray has been seted up in the front of cylinder bucket, sliding connection has the dust absorption head on the sliding tray, the overhead intercommunication of dust absorption has the hose, the top of hose with the inside intercommunication of dust catcher.
Compared with the related technology, the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the invention have the following beneficial effects:
the invention provides a high-vanadium high-speed steel composite roller and a manufacturing method thereof, which realizes the casting production of the high-vanadium high-speed steel composite roller and breaks through the production mode that only powder sintering is used. Due to the increase of the V element and the carbide thereof, the wear resistance of the roller is improved, and the service life of the roller is prolonged; the roller core adopts a short-flow process technology of remanufacturing waste rollers, so that the production cost of the manufactured roller is greatly reduced; the roller core adopts a short-flow process technology of remanufacturing waste rollers, so that the smelting and spheroidizing processes of nodular cast iron molten iron at the core are omitted, the energy consumption is reduced, and the pollution to the atmospheric environment is reduced;
the wear resistance of the roller is improved and the service life of the roller is prolonged by adding a large amount of V elements in the high-speed steel material of the working layer of the roller; the molten high-vanadium high-speed steel of the roller working layer adopts a static pouring production process technology, so that the problem of segregation of components and tissues caused by centrifugal casting is avoided, and the wear resistance uniformity of the roller working layer is good; the short-flow process technology for remanufacturing the waste roller is adopted, the roller manufacturing cost is reduced, the economic benefits of enterprises are improved, and the roller core is recycled by adopting the waste roller, so that the energy consumption and the pollution caused by core molten iron smelting are avoided, the previous core molten iron spheroidizing process is reduced, and the pollution of a large amount of smoke generated by spheroidizing to the environment is avoided.
Drawings
FIG. 1 is a block flow diagram of a first embodiment of a high vanadium high speed steel composite roll and method of making the same according to the present invention;
FIG. 2 is a graph comparing the weight percent of the ingredients of the example of the present invention and a prior art product;
FIG. 3 is a graph comparing the results of the use of the product of the present invention with the results of the prior art, the cost of the product, and the amount of pollutants emitted;
fig. 4 is a schematic structural diagram of a fifth embodiment of the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the invention.
Reference numbers in the figures: 1. the dust collector comprises a base, 2, a support frame, 3, a top plate, 4, a dust collector, 5, a cylindrical barrel, 6, a sliding groove, 7, a dust collection head, 8 and a hose.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
First embodiment
Referring to fig. 1, fig. 1 is a schematic structural diagram of a high-vanadium high-speed steel composite roll and a manufacturing method thereof according to a first embodiment of the present invention. A high vanadium high speed steel composite roll comprising:
the roller comprises a roller working layer and a roller core roller shaft, wherein the roller working layer is made of high-vanadium high-speed steel, and the high-vanadium high-speed steel comprises the following chemical components in percentage by weight: 1.5 to 2.2 percent of C, 0.8 to 1.6 percent of Si, 0.5 to 1.0 percent of Mn, 4.0 to 7.0 percent of Cr, 3.0 to 6.0 percent of Mo, 8.0 to 12.0 percent of V, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S and the balance of Fe.
The formula of the high-vanadium high-speed steel material for the roller working layer comprises the following components: 1.99% of C, 0.85% of Si, 0.65% of Mn, 4.12% of Cr, 4.19% of Mo, 9.89% of V, 0.029% of P, 0.026% of S and the balance of Fe.
A manufacturing method of a high-vanadium high-speed steel composite roller comprises the following steps:
s1, waste collection: the diameter and the length of a waste roller used in a steel plant are more than 10mm larger than those of a roller neck of a roller to be remanufactured;
the influence of oxidation and deformation on the processing amount of the two ends of the roller shaft during the later quenching of the high-vanadium high-speed steel roller is met;
s2, waste pretreatment: turning to remove the residual part of the used outer layer of the roll body of the old roll to form a complete roll core part roll shaft;
in order to better compound the high-vanadium high-speed steel molten metal and the roll shaft, the compound surface of the roll shaft is processed into a tooth shape, the tooth height is controlled to be 3-10mm, and the tooth pitch width is not limited;
s3, processing waste materials: the roll shaft is placed in a resistance furnace and heated to a certain temperature, the surface temperature and the internal heat storage capacity of the roll shaft are ensured, and a bottom box, a cope box and a pouring cup for casting are baked and dried;
s4, preparing composite pouring: before the high-vanadium high-speed molten steel on the roller working layer is poured, firstly, a bottom box is laid flat, a sizing block is arranged in the middle of the bottom box and used for placing and positioning a roller shaft, then, an upper sand box is assembled, the roller shaft is lifted out of a furnace, a dust removal device is used for removing floating dust on the surface and then immediately placed into the sand box, a pre-prefabricated sand core protection is sleeved on a roller neck part at the upper end of the roller shaft, and each part is compacted and then poured;
s5, composite pouring: melting high-vanadium high-speed steel molten steel on a roller working layer by using a medium-frequency electric furnace, tapping and slagging off when the components and the temperature of the high-vanadium high-speed steel molten steel meet preset requirements, pouring the molten steel into a casting mold after mold closing by adopting a bottom pouring static pouring mode, and then cooling and forming to finally obtain a manufactured composite roller;
because the roller is a cylinder, when in pouring, the high-vanadium high-speed molten steel enters the liquid level in the casting mould from the tangent pouring gate and rotates and stably rises, the control of the instantaneous equilibrium temperature of the contact surface of the high-vanadium high-speed molten steel and the roller shaft can melt the surface of the roller shaft, and a large amount of alloy in the high-vanadium high-speed molten steel can not be diffused into the roller shaft, so that the melt compounding of the liquid high-vanadium high-speed molten steel and the solid nodular cast iron is realized. The liquid level height generally exceeds 300-600mm of the top of the tooth surface of the roll shaft according to the size of the roll so as to ensure that sufficient feeding amount and a space for floating and remaining slag in the high-vanadium high-speed molten steel are reserved.
The casting temperature of the high-vanadium high-speed molten steel in the S5 is 1550-1650 ℃, the temperature of a roller shaft during casting is 700-800 ℃, and the casting temperature is 300-400 ℃;
thereby ensuring that the instantaneous equilibrium temperature of the contact surface of the high-vanadium high-speed molten steel and the roll shaft is controlled to be about 1150 ℃.
And S3, heating the mixture in a resistance furnace to 800 ℃ at 750-.
The working principle of the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the invention is as follows:
s1, waste collection: the diameter and the length of the waste roller used in the steel mill are more than 10mm larger than those of the roller neck of the roller to be remanufactured. The influence of oxidation and deformation on the processing amount of the two ends of the roller shaft during the later quenching of the high-vanadium high-speed steel roller is met;
s2, waste pretreatment: turning to remove the residual part of the used outer layer of the roll body of the old roll to form a complete roll core part roll shaft; in order to better compound the high-vanadium high-speed steel molten metal and the roll shaft, the compound surface of the roll shaft is processed into a tooth shape, the tooth height is controlled to be 3-10mm, and the tooth pitch width is not limited;
s3, processing waste materials: the roll shaft is placed in a resistance furnace and heated to a certain temperature, the surface temperature and the internal heat storage capacity of the roll shaft are ensured, and a bottom box, a cope box and a pouring cup for casting are baked and dried;
s4, preparing composite pouring: before the high-vanadium high-speed molten steel on the roller working layer is poured, firstly, a bottom box is laid flat, a sizing block is arranged in the middle of the bottom box and used for placing and positioning a roller shaft, then, an upper sand box is assembled, the roller shaft is lifted out of a furnace, a dust removal device is used for removing floating dust on the surface and then immediately placed into the sand box, a pre-prefabricated sand core protection is sleeved on a roller neck part at the upper end of the roller shaft, and each part is compacted and then poured;
when the dust removal device is used, the roller shaft to be subjected to dust removal is placed in the cylindrical barrel 5, the dust collector 4 is started to generate suction force, the dust collection head 7 is enabled to collect dust on the surface of the roller shaft, the dust collection head 7 is pushed to slide in the sliding groove 6, then the roller shaft is rotated to remove dust on the surface of the roller shaft, and therefore the dust removal rate of the roller shaft is improved;
s5, composite pouring: and melting the high-vanadium high-speed molten steel on the working layer of the roller by using an intermediate frequency electric furnace, tapping and slagging off when the components and the temperature of the high-vanadium high-speed molten steel meet preset requirements, pouring the molten steel into a casting mold after mold closing by adopting a bottom pouring static pouring mode, and then cooling and forming to finally obtain the manufactured composite roller.
Compared with the related technology, the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the invention have the following beneficial effects:
the casting production of the high-vanadium high-speed steel composite roller becomes a reality, and breaks through the production mode that the high-vanadium high-speed steel composite roller only depends on powder sintering. Due to the increase of the V element and the carbide thereof, the wear resistance of the roller is improved, and the service life of the roller is prolonged; the roller core adopts a short-flow process technology of remanufacturing waste rollers, so that the production cost of the manufactured roller is greatly reduced; the roller core adopts a short-flow process technology of remanufacturing waste rollers, so that the smelting and spheroidizing processes of nodular cast iron molten iron at the core are omitted, the energy consumption is reduced, and the pollution to the atmospheric environment is reduced;
the wear resistance of the roller is improved and the service life of the roller is prolonged by adding a large amount of V elements in the high-speed steel material of the working layer of the roller; the molten high-vanadium high-speed steel of the roller working layer adopts a static pouring production process technology, so that the problem of segregation of components and tissues caused by centrifugal casting is avoided, and the wear resistance uniformity of the roller working layer is good; the short-flow process technology for remanufacturing the waste roller is adopted, the roller manufacturing cost is reduced, the economic benefits of enterprises are improved, and the roller core is recycled by adopting the waste roller, so that the energy consumption and the pollution caused by core molten iron smelting are avoided, the previous core molten iron spheroidizing process is reduced, and the pollution of a large amount of smoke generated by spheroidizing to the environment is avoided.
Second embodiment
Referring to fig. 2-3, a second embodiment of the present application provides another high-vanadium high-speed steel composite roll and a manufacturing method thereof based on the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the first embodiment of the present application. The second embodiment is only the preferred mode of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the second embodiment of the present application provides a high-vanadium high-speed steel composite roll and a manufacturing method thereof, which are different in that: the formula of the high-vanadium high-speed steel material for the roller working layer comprises the following components: 1.55% of C, 0.92% of Si, 0.95% of Mn, 6.80% of Cr, 5.33% of Mo, 8.25% of V, 0.023% of P, 0.021% of S and the balance of Fe.
The roller shaft of the roller core part adopts a scrapped ductile cast iron roller used by a rolling frame in a bar mill, the size of the roller body part of the roller shaft is phi 270 multiplied by 700mm after turning, the surface of the roller body part of the roller shaft is processed into a tooth surface with the height of 7mm, and the diameter of the roller neck bearing position at two ends of the roller shaft is phi 220 mm; respectively molding a bottom box and a cope box of the casting mold according to the specification requirement of the roller, and reserving the height of a roller working layer part in the bottom box by 30mm so as to facilitate the arrangement of a cross gate and the shrinkage processing amount; the roll shaft was heated to 720 ℃ in a resistance furnace and held for 2 hours, while the bottom box for casting, together with the parallels, cope flask and pouring cup, was heated to 380 ℃ in another car furnace and held for 4 hours.
Melting high-vanadium high-speed molten steel on a roller working layer by using a single medium-frequency electric furnace, closing the high-vanadium high-speed molten steel about 20 minutes before pouring, firstly, flatting a bottom box, then, closing a cope box, putting the cope box on a sprue cup for fixing firmly, removing impurities in a casting mold and a pouring system, finally, lifting a roller shaft out of a resistance furnace, removing surface floating dust, immediately putting the roller shaft on a sizing block in the casting mold, simultaneously checking that the gap between the periphery of the roller shaft and the cope box is uniform, sleeving a roller neck protection sand core at the upper end of the roller shaft, fixing firmly, and waiting for pouring after each part is compact.
And immediately tapping, slagging off and pouring when the components and the temperature of the molten steel of the high-vanadium high-speed steel meet preset requirements. The casting temperature of the high-vanadium high-speed molten steel is 1630 ℃, the roll shaft temperature during casting is 705 ℃, and the casting temperature is 360 ℃. When pouring, observing the rising of the liquid level of the high-vanadium high-speed steel liquid steel from the upper end of the casting mould, controlling the liquid level to rotate stably and rise, controlling the liquid level to exceed the tooth surface part of the roll shaft by about 350mm, naturally cooling the poured composite roll to 80 ℃, opening the box and cleaning.
Third embodiment
Referring to fig. 2-3, a third embodiment of the present application provides another high-vanadium high-speed steel composite roll and a manufacturing method thereof based on the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the first embodiment of the present application. The third embodiment is only the preferable mode of the first embodiment, and the implementation of the third embodiment does not affect the implementation of the first embodiment alone.
Specifically, the third embodiment of the present application provides a high-vanadium high-speed steel composite roll and a manufacturing method thereof, which are different in that: the formula of the high-vanadium high-speed steel material for the roller working layer comprises the following components: 2.16% of C, 0.82% of Si, 0.91% of Mn, 5.09% of Cr, 5.81% of Mo, 11.65% of V, 0.025% of P, 0.025% of S and the balance of Fe.
The roller shaft of the roller core part adopts a scrapped ductile cast iron roller used by a rolling frame in a bar mill, the size of the roller body part of the roller shaft is phi 280 multiplied by 800mm after turning, the surface of the roller body part of the roller shaft is processed into a tooth surface with the height of 10mm, and the diameter of the roller neck bearing position at two ends of the roller shaft is phi 220 mm; respectively molding a bottom box and a cope box of the casting mold according to the specification requirement of the roller, and reserving the height of a roller working layer part in the bottom box by 40mm so as to facilitate the arrangement of a cross gate and the shrinkage processing amount; the roll shaft was heated to 730 ℃ for 2 hours in a resistance furnace, and the bottom box for casting, together with the parallels, cope flask and pouring cup, was heated to 420 ℃ for 4 hours in another car.
Melting high-vanadium high-speed molten steel on a roller working layer by using a single medium-frequency electric furnace, closing the high-vanadium high-speed molten steel about 20 minutes before pouring, firstly, flatting a bottom box, then, closing a cope box, putting the cope box on a sprue cup for fixing firmly, removing impurities in a casting mold and a pouring system, finally, lifting a roller shaft out of a resistance furnace, removing surface floating dust, immediately putting the roller shaft on a sizing block in the casting mold, simultaneously checking that the gap between the periphery of the roller shaft and the cope box is uniform, sleeving a roller neck protection sand core at the upper end of the roller shaft, fixing firmly, and waiting for pouring after each part is compact.
And immediately tapping, slagging off and pouring when the components and the temperature of the molten steel of the high-vanadium high-speed steel meet preset requirements. The casting temperature of the high-vanadium high-speed steel molten steel is 1598 ℃, the roll shaft temperature during casting is 710 ℃, and the casting temperature is 400 ℃. When pouring, observing the rising of the liquid level of the high-vanadium high-speed molten steel from the upper end of the casting mold, controlling the liquid level to rotate stably and rise, controlling the liquid level to exceed the tooth surface of the roll shaft by about 400mm, naturally cooling the poured composite roll to 80 ℃, opening the mold and cleaning.
Fourth embodiment
Referring to fig. 2-3, a fourth embodiment of the present application provides another high-vanadium high-speed steel composite roll and a manufacturing method thereof based on the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided by the first embodiment of the present application. The fourth embodiment is only a preferable mode of the first embodiment, and the implementation of the fourth embodiment does not affect the implementation of the first embodiment alone.
Specifically, the fourth embodiment of the present application provides a high-vanadium high-speed steel composite roll and a manufacturing method thereof, which are different in that: the formula of the high-vanadium high-speed steel material for the roller working layer comprises the following components: 1.87% of C, 1.05% of Si, 0.78% of Mn, 5.93% of Cr, 4.89% of Mo, 9.05% of V, 0.033% of P, 0.028% of S and the balance of Fe.
The roller shaft of the roller core part adopts a scrapped ductile cast iron roller used by a rolling frame in a bar mill, the size of the roller body part of the roller shaft is phi 280 multiplied by 800mm after turning, the surface of the roller body part of the roller shaft is processed into a tooth surface with the height of 8mm, and the diameter of the roller neck bearing position at two ends of the roller shaft is phi 220 mm; respectively molding a bottom box and a cope box of the casting mold according to the specification requirement of the roller, and reserving the height of a roller working layer part in the bottom box by 40mm so as to facilitate the arrangement of a cross gate and the shrinkage processing amount; the roll shaft is heated to 800 ℃ in a resistance furnace and is kept warm for 2 hours, and simultaneously the bottom box for casting, the sizing block, the cope box and the pouring cup are heated to 400 ℃ in another trolley furnace and are kept warm for 4 hours.
Melting high-vanadium high-speed molten steel on a roller working layer by using a single medium-frequency electric furnace, closing the high-vanadium high-speed molten steel about 20 minutes before pouring, firstly, flatting a bottom box, then, closing a cope box, putting the cope box on a sprue cup for fixing firmly, removing impurities in a casting mold and a pouring system, finally, lifting a roller shaft out of a resistance furnace, removing surface floating dust, immediately putting the roller shaft on a sizing block in the casting mold, simultaneously checking that the gap between the periphery of the roller shaft and the cope box is uniform, sleeving a roller neck protection sand core at the upper end of the roller shaft, fixing firmly, and waiting for pouring after each part is compact.
And immediately tapping, slagging off and pouring when the components and the temperature of the molten steel of the high-vanadium high-speed steel meet preset requirements. The casting temperature of the high-vanadium high-speed steel molten steel is 1570 ℃, the temperature of a roll shaft during casting is 740 ℃, and the casting temperature is 380 ℃. When pouring, observing the rising of the liquid level of the high-vanadium high-speed steel liquid steel from the upper end of the casting mould, controlling the liquid level to rotate stably and rise, controlling the liquid level to exceed the tooth surface part of the roll shaft by about 350mm, naturally cooling the poured composite roll to 90 ℃, opening the box and cleaning.
As can be seen from the comparison result in the attached figure 3, the wear resistance of the high-vanadium high-speed steel composite roller produced by adopting the technology of the invention is obviously higher than that of the product in the prior art, the steel passing amount of a single groove is increased by 70-80% each time, the production cost of the high-vanadium high-speed steel composite roller is reduced by 20% compared with that of the traditional high-speed steel roller, and the pollutant emission amount produced by the production process of the high-vanadium high-speed steel composite roller produced by adopting the technology of the invention is reduced by about 70% compared with that produced by the production process of the product in the prior art.
Fifth embodiment
Referring to fig. 4, based on the high-vanadium high-speed steel composite roll and the manufacturing method thereof provided in the first embodiment of the present application, a fifth embodiment of the present application provides another high-vanadium high-speed steel composite roll and the manufacturing method thereof. The fifth embodiment is only a preferable mode of the first embodiment, and the implementation of the fifth embodiment does not affect the implementation of the first embodiment alone.
Specifically, a fifth embodiment of the present application provides a high-vanadium high-speed steel composite roll and a manufacturing method thereof, which are different in that: the dust removal device used in the S4 comprises a base 1, wherein two sides of the top of the base 1 are fixedly connected with support frames 2, a top plate 3 is fixedly connected between two opposite sides of the support frames 2, and a dust collector 4 is arranged at the top of the top plate 3;
the dust collector 4 is connected with an external power supply and a control switch;
the dust collector who sets up can absorb the dust on roller surface, reaches the effect of dust removal.
The bottom of the top plate 3 is fixedly connected with a cylindrical barrel 5 used for placing a roller shaft, the front of the cylindrical barrel 5 is provided with a sliding groove 6, the sliding groove 6 is connected with a dust collection head 7 in a sliding manner, the dust collection head 7 is communicated with a hose 8, and the top end of the hose 8 is communicated with the inside of the dust collector 4;
the hose 8 can be stretched to meet the requirements of sliding left and right;
the sliding groove 6 is arranged to improve the moving stability of the dust collection head 7.
The roller shaft to be dedusted is placed in the cylindrical barrel 5, the dust collector 4 is started to generate suction, the dust collecting head 7 is enabled to absorb dust on the surface of the roller shaft, the dust collecting head 7 is pushed to slide in the sliding groove 6, then the roller shaft is rotated to remove dust on the surface of the roller shaft, and therefore the dust removing rate of the roller shaft is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A high-vanadium high-speed steel composite roll is characterized by comprising:
the roller comprises a roller working layer and a roller core roller shaft, wherein the roller working layer is made of high-vanadium high-speed steel, and the high-vanadium high-speed steel comprises the following chemical components in percentage by weight: 1.5 to 2.2 percent of C, 0.8 to 1.6 percent of Si, 0.5 to 1.0 percent of Mn0, 4.0 to 7.0 percent of Cr, 3.0 to 6.0 percent of Mo, 8.0 to 12.0 percent of V, less than or equal to 0.035 percent of P, less than or equal to 0.030 percent of S and the balance of Fe.
2. The high-vanadium high-speed steel composite roll according to claim 1, wherein the formula of the high-vanadium high-speed steel material for the working layer of the roll is as follows: 1.99% of C, 0.85% of Si, 0.65% of Mn, 4.12% of Cr, 4.19% of Mo, 9.89% of V, 0.029% of P, 0.026% of S and the balance of Fe.
3. The high-vanadium high-speed steel composite roll according to claim 1, wherein the formula of the high-vanadium high-speed steel material for the working layer of the roll is as follows: 1.55% of C, 0.92% of Si, 0.95% of Mn, 6.80% of Cr, 5.33% of Mo, 8.25% of V, 0.023% of P, 0.021% of S and the balance of Fe.
4. The high-vanadium high-speed steel composite roll and the manufacturing method thereof according to claim 1, wherein the formula of the high-vanadium high-speed steel material for the working layer of the roll is as follows: 2.16% of C, 0.82% of Si, 0.91% of Mn, 5.09% of Cr, 5.81% of Mo, 11.65% of V, 0.025% of P, 0.025% of S and the balance of Fe.
5. The high-vanadium high-speed steel composite roll and the manufacturing method thereof according to claim 1, wherein the formula of the high-vanadium high-speed steel material for the working layer of the roll is as follows: 1.87% of C, 1.05% of Si, 0.78% of Mn, 5.93% of Cr, 4.89% of Mo, 9.05% of V, 0.033% of P, 0.028% of S and the balance of Fe.
6. The manufacturing method of the high-vanadium high-speed steel composite roller is characterized by comprising the following steps of:
s1, waste collection: the diameter and the length of a waste roller used in a steel plant are more than 10mm larger than those of a roller neck of a roller to be remanufactured;
s2, waste pretreatment: turning to remove the residual part of the used outer layer of the roll body of the old roll to form a complete roll core part roll shaft;
s3, processing waste materials: the roll shaft is placed in a resistance furnace and heated to a certain temperature, the surface temperature and the internal heat storage capacity of the roll shaft are ensured, and a bottom box, a cope box and a pouring cup for casting are baked and dried;
s4, preparing composite pouring: before the high-vanadium high-speed molten steel on the roller working layer is poured, firstly, a bottom box is laid flat, a sizing block is arranged in the middle of the bottom box and used for placing and positioning a roller shaft, then, an upper sand box is assembled, the roller shaft is lifted out of a furnace, a dust removal device is used for removing floating dust on the surface and then immediately placed into the sand box, a pre-prefabricated sand core protection is sleeved on a roller neck part at the upper end of the roller shaft, and each part is compacted and then poured;
s5, composite pouring: and melting the high-vanadium high-speed molten steel on the working layer of the roller by using an intermediate frequency electric furnace, tapping and slagging off when the components and the temperature of the high-vanadium high-speed molten steel meet preset requirements, pouring the molten steel into a casting mold after mold closing by adopting a bottom pouring static pouring mode, and then cooling and forming to finally obtain the manufactured composite roller.
7. The method for manufacturing the high-vanadium high-speed steel composite roller according to claim 6, wherein the casting temperature of the molten high-vanadium high-speed steel in S5 is 1550-1650 ℃, the roll shaft temperature during casting is 700-800 ℃, and the casting temperature is 300-400 ℃.
8. The method for manufacturing the high-vanadium high-speed steel composite roller as claimed in claim 6, wherein the resistance furnace is heated to 800 ℃ at 750-.
9. The high-vanadium high-speed steel composite roll and the manufacturing method thereof according to claim 6, wherein the dust removing device used in S4 comprises a base, support frames are fixedly connected to two sides of the top of the base, a top plate is fixedly connected between the two opposite sides of the support frames, and a dust collector is arranged on the top of the top plate.
10. The high-vanadium high-speed steel composite roll and the manufacturing method thereof according to claim 9, wherein a cylindrical barrel for placing a roll shaft is fixedly connected to the bottom of the top plate, a sliding groove is formed in the front surface of the cylindrical barrel, a dust suction head is connected to the sliding groove in a sliding manner, a hose is communicated with the dust suction head, and the top end of the hose is communicated with the inside of the dust collector.
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| CN202111021896.8A CN113667898A (en) | 2021-09-01 | 2021-09-01 | High-vanadium high-speed steel composite roller and manufacturing method thereof |
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| CN202111021896.8A CN113667898A (en) | 2021-09-01 | 2021-09-01 | High-vanadium high-speed steel composite roller and manufacturing method thereof |
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