53results about How to "Small drop in hardness" patented technology

The invention discloses a manufacturing technology and device for an improved forged steel roller neck high nickel chrome molybdenum alloy cast composite roller. The roller comprises, by mass percent, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, not larger than 0.05% of P, not larger than 0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE and the balance Fe and inevitable micro elements. Yttrium base rare-earth nodulizing and Ba, Ca, and silicon iron composite inoculation are adopted, Nb, Ti, V, B and Sb are added for modification, and the mechanical performance of the roller is improved; by the adoption of the forged steel roller neck, the strength of the roller is improved, an induction heater is adopted to carry out in-mold whole heating casting on a core stick, a water cooled crystallizer is molded, a composite layer interface can be dynamically controlled, the technology is simple, the efficiency is high, power consumption is small, the cost is low, no composition segregation exists, and the service life of the roller is long.

The invention discloses a centrifugal cast Cr12MoV shape steel straightening roll and a production technology thereof. A centrifugal layer of a roll ring comprises a work layer and an inner layer and is cast through two times of centrifugal casting in an interval mode. The material of the work layer is Cr12MoV. The material of the inner layer is graphitic steel. The production technology comprises the steps that molten steel is subjected to the processing procedures of component design, stokehold molten steel treatment, spraying of cold type coating, smelting, centrifugal pouring, pit heat preservation, hot box opening and heat treatment, and the Cr12MoV shape steel straightening roll is obtained. According to the centrifugal cast Cr12MoV shape steel straightening roll and the production technology thereof, the problems that the roll face of a forged straightening roll axially cracks and loses efficacy in the using process are solved. The centrifugal cast Cr12MoV shape steel straightening roll has the characteristics of being high in abrasion resistance and long in service life, and the manufacture cost of the straightening roll is reduced.

The invention discloses a modified manufacturing process for a high-chromium cast iron composite roll through a forged steel roll neck and equipment. The material comprises, by mass, 3.0%-3.6% of C, 0.60%-1.20% of Si, 0.30%-1.20% of Mn, 3.0%-5.0% of Ni, 1.0%-2.0% of Cr, 0.40%-1.2% of Mo, 0.1%-2% of W, 0.5%-1.0% of Cu, 0%-0.05% of P, 0%-0.03% of S, 0.04%-0.06% of Mg, 0.1%-0.3% of Nb, 0.1%-0.30% of Ti, 0.2%-0.6% of V, 0.05%-0.2% of B, 1.5%-2.5% of Ba, 1%-2% of Ca, 1%-3% of Sb, 0.02%-0.18% of N, 1.0%-2.0% of Y/RE and the balance Fe and inevitable microelements. Yttrium-based rare earth nodulizing and compound inoculating of Ba, Ca and silicon iron are adopted, and modification treatment is conducted by adding Nb, Ti, V, B, and Sb, so that the mechanical property of the roll is improved. The strength of the roll is improved through the forged steel roll neck. Overall in-mold heating and fusion casting are conducted on a core rod through an induction heater. Forming is conducted through a water cooled crystallizer. A composite layer interface can be dynamically controlled. The process is simple, the efficiency is high, power consumption is small, the cost is low, composition segregation is avoided, and the service life of the roll is long.

The invention discloses a manufacturing technique and equipment for a high-performance composite roller shaft. The manufacturing technique comprises the steps that a mandril installed in a combined water-cooling crystallizer is integrally heated to 840-1100 DEG C through an induction heater; molten liquid of a working layer of the roller shaft is poured into the mandril, and then the mandril is continued to be heated for 10-50 minutes; a lifting device is stared so as to lift the heater at a certain speed for 5-15 minutes, and the heater is stopped in the position of a heat-insulating ring; and heating is continued for 10-50 minutes, feeding is conducted on a dead head, and after heating is stopped, cooling is conducted for 30 minutes to 24 hours through water. When the composite roller shaft is manufactured through the manufacturing technique, the number of controllable technological parameters is small, the interface of a composite layer is easy to control, the technique is simple, the efficiency is high, the power consumption is low, the cost is low, the composite layer is free of composition segregation, and the service life of the roller shaft is long; the defect of a centrifugation method that structure segregation is prone to occurring is overcome, and the problems of a CPC method and an ESR method that the production technique is complex, and the cost is high are solved.

The invention discloses a manufacturing technology and device of a forged steel roller neck alloy nodular cast iron composite roller. The forged steel roller neck alloy nodular cast iron composite roller comprises, by mass percent, 3.2%-3.9% of C, 1.6%-2.1% of Si, 0.4%-0.8% of Mn, not larger than 0.05% of P, not larger than 0.03% of S, 0.2%-0.5% of Cr, 0.3%-0.7% of Mo, 1.4%-2.0% of Ni, 0.04%-0.06% of Mg, 0.06%-0.2% of Nb, 0.1%-0.25% of Ti, 0.2%-0.5% of V, 1.5%-2.5% of Ba, 1%-2% of Ca, 1.0%-2.0% of RE and the balance Fe. Rare-earth nodulizing and Ba, Ca and silicon iron compound inoculation are adopted, and Nb, Ti and V are added for modification, so that the mechanical property of the roller is improved, a forged steel roller neck is adopted to improve the strength of the roller, and an induction heater is adopted to carry out in-mold whole heating casting on a forged steel or cast steel core stick; and a combined type water cooled crystallizer is molded, a lifting device lifts the heater upwards at a certain speed to form area directional solidification, a composite layer interface is dynamically controlled, the technology is simple, the efficiency is high, the electric consumption is small, the cost is low, no composition segregation exists in the composite layer, and the service life of the roller is long.

The invention discloses a technique and equipment for a forged steel roll neck high-chrome cast iron composite roller. Materials comprise, by mass, 2.4-3.3% of C, 0.60-1.0% of Si, 0.50-1.20% of Mn, 0.8-1.2% of Ni, 15-20.0% of Cr, 0.80-2.2% of Mo, 0.5-1% of W, 0-0.05% of P, 0-0.03% of S, 1-3% of Sb, 0.02-0.18% of N, 0.1-0.3% of Y, and the balance Fe and inevitable trace elements. The rare earth Y and silicon iron are adopted for composite inoculation; grain refinement treatment is conducted by adding the Sb and the N, so that the mechanical properties of the roller are improved; the strength of the roller is improved by the adoption of a forged steel roll neck; integral in-mold heating and casting are conducted on a mandril through an induction heater, and a water-cooling crystallizer is used for formation. The interface of a composite layer can be dynamically controlled, the technique is simple, the cost is low, composition segregation is avoided, and the service life of the roller is long.

The invention discloses a method and a dedicated roller body shaping device for producing a grooved cast roller through a centrifugal method. The dedicated roller body shaping device comprises a cold type, and further comprises locating movable blocks and hole type movable blocks. The cold type is located outside, the annular locating movable blocks and the annular hole type movable blocks are arranged on the inner wall of the cold type in parallel at intervals. Two ends of the hole type movable blocks are limited by the locating movable blocks respectively. According to the principle, a roller body with a hole type is directly produced through the centrifugal method, therefore, a previous roller body shaping device is changed, on the basis of the existing cold type, the locating movable blocks and the hole type movable blocks are ingeniously designed, the hole type can be cast in the roller body of a roller in advance, fine grain high-abrasion-resisting layers are arranged at the bottom and on the surface of the hole type, the bottom and the surface of the hole type have identical hardness and abrasion resistance, and the service life of the roller can be effectively prolonged.

The invention provides an inoculation line formula for gray cast iron feeding and inoculation and a production process. The inoculation line formula comprises elements: 2.0-2.5% of magnesium, 50-58% of silicon, 1-3% of rare earth, 2.0-3.5% of barium, less than or equal to 1.5% of calcium, less than or equal to 2% of aluminum, and the balance iron. The production process of the inoculation line formula comprises the steps of selecting raw materials including, by mass, 60-65% of steel scraps, 30-35% of recirculated iron and 5-10% of pig iron to be proportioned; smelting and controlling the material compositions; and conducting feeding and inoculation through the inoculation line formula after pre-burying 0.15-0.2% of ferrosilicon to conduct inoculation on molten iron for the first time. Through rational chemical composition control, the actions of all the elements under different environments are given full play to, so that the tensile strength of a produced gray cast iron material is greater than or equal to 330 MPa, and the yield strength is greater than or equal to 220 MPa. As the inoculation line contains rare earth, the inoculation effect is enhanced, inoculation fade is effectively prevented, and inoculation is uniform. After gray cast iron casting through the inoculation line formula, the obtained gray cast iron is excellent in performance, small in hardness drop and highin stability.

The invention relates to a novel graphite semi-steel bar and finished product roller assembly, which comprises an upper roller and a lower roller. The upper roller comprises an upper roller body, andan upper roller neck and an upper bearing retainer roll neck located on two ends of the upper roller body; the lower roller comprises a lower roller body, and a lower roller neck and a lower bearing retainer roll neck arranged correspondingly; 2 to 5 'U'-shaped grooves surrounding the upper roller body are arranged on the upper roller body at intervals; 2 to 5 inverted 'U'-shaped bulges surrounding the lower roller body are arranged on the lower roller body at corresponding intervals; a smooth platform is arranged between each two adjacent grooves or bulges; and the upper roller body and the lower roller body are mutually meshed. According to the novel graphite semi-steel bar and finished product roller assembly provided by the invention, through the inverted 'U'-shaped bulges and the 'U'-shaped grooves of the roller bodies, bars and parts with required shapes are rolled, and meanwhile, through adjusting a distance between the two rollers, the thicknesses of the rolled bars and partsare adjusted, so that the production efficiency is improved.

The invention relates to a novel pinch roll. The novel pinch roll comprises an upper pinch roll body and a lower pinch roll body, wherein the upper pinch roll body comprises an upper pinch roll sleeve, an upper pinch roll mandrel is arranged in the upper pinch roll sleeve, the length of the main body of the upper pinch roll mandrel is greater than that of the main body of the upper pinch roll sleeve, end face baffles are arranged at the two ends of an opening of the upper pinch roll sleeve, a connecting key block is arranged on one side of each end face baffle, each connecting key block is provided with a key block fastening bolt used for fixing, baffle fastening bolts used for fixing are arranged on the end face baffles and are opposite to the connecting key blocks, shaft shoulders matched with the inner sides of the end face baffles on the two sides are arranged in the middle of the upper pinch roll mandrel, and mandrel connecting key blocks are arranged at the connecting positions of the end face baffles and the upper pinch roll mandrel; and the lower pinch roll body comprises a lower pinch roll sleeve, and a metallurgical bonding lower pinch roller mandrel is arranged in the lower pinch roll sleeve. The novel pinch roll overcomes shortcomings of existing technology and is reasonable in structure and high in abrasion resistance and toughness, and the comprehensive use performance of the pinch roll is improved.

The invention discloses a production process of a niobium-molybdenum chilled alloy composite roller, which comprises the following steps: smelting a working layer raw material by using a 1.5-ton intermediate frequency furnace to prepare working layer iron liquid, and smelting a core layer raw material by using a 3-ton intermediate frequency furnace to prepare core roller neck iron liquid; fourthly, centrifugal casting is conducted at the temperature of 1350-1370 DEG C, and a working layer is formed after casting is finished; then, core roller neck iron liquid with the temperature of 1375-1385 DEG C is cast in a static core filling mode to form a core layer. Through scientific research and innovation, by adjusting a matrix structure, then adding niobium and molybdenum and through iron mold centrifugal chilling casting, the hardness fall is reduced, and the hardness of a working layer of the roller is improved; the carbon content fully ensures that metal and carbon can form stable network carbide, and the hardness and toughness of the roller are improved.

The invention discloses a preparation method of a high-alloy centrifugal roller, and belongs to the field of preparation of rollers. The high-alloy centrifugal roller comprises a working layer and a core portion. The preparation method includes the steps: slowly cooling the rollers; rapidly reducing temperature; annealing at lower temperature. According to the method, solidification and cooling processes and annealing temperature and time of the rollers are reasonably controlled, high-temperature quenching of a preparation process of the high-alloy centrifugal roller is omitted, so that production processes are simplified, device investment is reduced, a production cycle is shortened, production cost is reduced, and the roller meets requirements and is stable in performance.

The invention relates to an improvement on a material and a quenching mode for an integrated cast steel supporting roller. The integrated cast steel supporting roller is characterized by consisting of a supporting roller body and a mandrel cast steel material, wherein the mandrel cast steel material comprises the following components in percentage by weight: 0.4 to 0.6 percent of C, 0.3 to 0.6 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.3 percent of Ni, 4.8 to 5.2 percent of Cr, 0.5 to 0.7 percent of Mo, 0.1 to 0.2 percent of V, 0.1 to 0.2 percent of Ti, 0.005 to 0.1 percent of B, 0.01 to 0.03 percent of Ca, 0.6 to 0.9 percent of Mn and the balance of iron and inevitable impurities; and the roller body is quickly heated by adopting a differential temperature furnace in heat treatment, and quenching is performed after the temperature of a working layer reaches the quenching requirement. The defects that the conventional 50Cr5MoV cast blank grains are thick, loose and not compact are overcome; and the tissue grains of the obtained supporting roller are fine, the issue is bainite, and the supporting roller basically has no pearlite tissue, so the strength, toughness and quenching capacity of the supporting roller are improved, and the service life is prolonged. The working layer is subjected to effective thorough quenching by differential temperature quick quenching, so the service life of the working layer of the supporting roller is prolonged; the mandrel tissue of the inner layer is not changed, and the quenching basically does not affect the performance of the mandrel, so the strength of the mandrel is ensured, and the mandrel has high strong toughness; and the whole service life of the supporting roller is prolonged by 30 percent compared with that of the conventional 50Cr5MoV supporting roller.

The invention discloses a high-performance flange shaft, and belongs to the technical field of flange shaft preparation. Based on conventionally adding Cr, Mn and Ni, N, Al, Zr and other elements are further added by starting from the angle of improving the flange shaft microhardness and refining the flange shaft grains to refine the flange shaft structure. The high-performance flange shaft is prepared by the following steps: casting a casting blank according to the proportion of chemical element components; annealing the flange shaft; stepwise heating the flange shaft by adopting a vacuum gas quenching furnace; introducing argon into the vacuum gas quenching furnace to quickly cool the flange shaft; and putting the flange shaft in a controlled-cooling device to control rotation of the flange shaft, coating a nano-ceramic coating to the surface of the flange shaft, discharging when the surface temperature of the flange shaft is lower than 150 DEG C, cooling in the air, and refining. The high-performance flange shaft can be used for improving the structure homogeneity, has small hardness drop and good abrasion resistance, and can be used for effectively improving the problem of out-of-round deformation of the flange shaft and improving the production yield.