35results about How to "Reduce the number of roll changes" patented technology

A method for a rolling mill to roll round steel with the diameter phi of 120mm and round steel with the diameter phi of 130mm by one roller set includes the ten-pass design of a 650mm rolling mill and a regulating method thereof. The two types of round steel share the first, second, third, fourth and fifth passes and the eighth pass of leader passes. When in rolling of the round steel with the diameter phi of 120mm, the roller gap of the upper rolling line is 6mm, feeding is carried out after 90-degree rotation from the seventh pass to the eighth pass. When in rolling of the round steel with the diameter phi of 130mm, the roller gap of the upper rolling line is regulated to be 11mm, feeding is carried out from the fifth pass to the eighth pass after the sixth pass and the seventh pass arecast off, the third pass and the fifth pass meet the requirement for the entry width of the previous pass in the processes of rolling the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously, the eighth pass meets requirements of the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously,the width B of the eighth pass meets requirements of the round steel with the diameter phi of 130mm, and the height H thereof meets requirements of the round steel with the diameter phi of 120mm. By the method, the rolling mill can roll the round steel in two specifications by the same roller set, and roller changing frequency and time due to alternating of the two specifications can be reduced.

The invention relates to a method for rolling square steel. A frame is at least provided with a frame group consisting of an elliptical hole frame and a round hole frame, and a diamond hole frame and a square hole frame are connected behind the frame group. By the method for rolling the square steel, for steel rolling manufacturers which are put into operation, when square steel and round steel products are collinearly rolled by the same set of continuous rolling unit, the phenomenon of round steel hole pattern accompanying turning caused by nonuniform rolling yield can be effectively avoided, the utilization rate of a roller can be effectively improved, the consumption of the roller is reduced, and times for changing the roller can be reduced; the types of hole patterns are reduced, the sharing performance of on-line hole patterns is greatly improved, the times for changing the roller in a rolling line are reduced, and the roller is fully utilized; fishtail at the tail of a rolled piece, which is formed due to nonuniform deformation, has small length, so that the yield of the rolled piece is improved; the stress concentration of the roller is relatively small, so that risk that the roller is broken is reduced; and a tilting gear in front of a continuous rolling machine is saved, so that equipment investment is reduced.

The invention discloses a furnace roller surface anti-dross device of a strip steel annealing furnace, belongs to the equipment of strip steel thermal treatment, and in particular relates to a continuous strip steel annealing furnace. The furnace roller surface anti-dross device is characterized in that a gas inlet pipeline is arranged on a nitrogen conveying tube; the gas outlet end of the gas inlet pipeline is connected with a nitrogen humidifying device through a nitrogen inlet valve, a depressurizing valve, a wet gas adjusting valve and a dry gas adjusting valve; the nitrogen humidifying device is connected with a wet gas nozzle at the bottom of a uniform heating section of the annealing furnace through a wet gas inlet adjusting valve and an injection pipeline; and a gas path is formed by the gas inlet pipeline, the nitrogen humidifying device, the injection pipeline and the annealing furnace. The furnace roller surface anti-dross device has the advantages that the dew point of the atmosphere of the uniform heating section inside the annealing furnace is minus 27 DEG C to minus 35 DEG C, gas particles with high dew points are firstly enriched at rough valley points of a non-strip steel contact surface of a furnace roller, the high temperature strip steel from the heating section wraps the gas particles, and the gas particles are heated to expand, so that the sponge iron on the strip steel is effectively prevented from being bonded into dross on the furnace roller, the product quality is improved, the times of opening the furnace to replace the roller are reduced, the cost of spare parts and the production cost are lowered, and the product yield and the machine set working rate are increased.

The invention relates to a tungsten carbide roller. The tungsten carbide roller comprises the following components of: 84.5 to 85.5 percent of WC, 6.8 to 7.5 percent of Co, 6.8 to 7.5 percent of Ni, 0.2 to 0.5 percent of TiC, 0.2 to 0.5 percent of CrC, and 0.1 to 0.3 percent of VC. The mixed raw material powder is molded by an isostatic pressing process, and a roller blank is subjected to vacuum sintering treatment at the temperature of between 1,390 and 1,490 DEG C. Because a mixture of cobalt and nickel elements, titanium carbide, chrome carbide and vanadium carbide of hard alloy phase with extremely good bonding performance is added, the composition of the tungsten carbide roller is improved, and a reasonable internal tissue structure is formed. By reasonably selecting the sintering temperature in the vacuum state, defects of under sintering, over sintering and deformation are avoided, the tungsten carbide roller with good comprehensive performance is obtained, the rolling quantity of single-roll single rolling rings is improved by over two times, workload and expenditure of roller replacement are reduced, the work efficiency of the roller is improved, and the quality of wire products is ensured.

The invention discloses a tungsten carbide roll collar formula being capable of effectively solving the problems of low combination property and low rolling amount of the traditional tungsten carbide roll collar. The tungsten carbide roll collar formula comprises the following components in weight percentage: 93-98 percent of WC, 1.5-5 percent of Co, 0-4 percent of Ni, 0.2-0.3 percent of TiC, 0.2-0.3 percent of CrC, 0.05-0.3 percent of VC and 0.05-0.1 percent of Y. The invention has the advantages that the raw material composition and the component proportion of a tungsten carbide roll are improved so that the tungsten carbide roll has the internal condition formed by an internal organization structure meeting the service performance requirement, and moreover, the roll collar has small abrasion loss, smooth surface and long service period, cannot be broken and has low roll replacing frequency, and thus, the roll replacing work load is reduced, the cost is reduced, the operating rate of a rolling mill and the product quality are improved and the inherent quality and the surface quality of produced wire rod products are ensured.

The invention relates to a high-speed reeling machine, and particularly relates to a high-speed reeling machine for reeling steel belts rolled by a rolling mill. The high-speed reeling machine comprises a base which is provided with a stander; the stander is provided with an electric motor, a speed reducer and a reel; an output shaft of the electric motor is fixedly connected with an input shaft of the speed reducer and an output shaft of the speed reducer is fixedly connected with the reel; the outer end of the reel is arranged on a first bracket by means of a shaft; and a winding drum is sleeved on the reel in a reeling state. The high-speed reeling machine is characterized in that the base is provided with two rails parallel to each other; and two columns of rollers are arranged at the bottom of the stander, are respectively arranged in the corresponding rails and can roll along the longitudinal direction of the rails. A second bracket is arranged on one side, far away from and opposite to the reel, of the base, a first hydraulic oil cylinder is fixed on the second bracket, and a piston rod of the first hydraulic oil cylinder is hinged with the stander together. The high-speed reeling machine is used for reeling steel belts, and is large in reeling diameter and high in reeling precision.

The invention relates to the field of laser fusion covering alloy materials, in particular to a nano ceramic alloy material for strengthening the surface of a ductile iron roller with laser and a preparation method thereof. The method is characterized by taking WC ceramic alloy as the base and comprising the following chemical components in weight percentage: 4.0 to 5.5 percent of C, 1.2 to 2.0 percent of B, 1.5 to 2.5 percent of Si, 4.0 to 14.0 percent of Co, 0.02 to 0.06 percent of Ce, and the balance of W. The laser fusion covering nano ceramic alloy material of the surface of the ductile iron roller is characterized by taking WC ceramic alloy as the base and comprising the following chemical components in weight percentage: 4.0 to 5.5 percent of C, 1.2 to 2.0 percent of B, 1.2 to 2.0 percent of Ti, 4.0 to 14.0 percent of Co, 0.02 to 0.06 percent of Ce, and the balance of W. Compared with the prior art, the nano ceramic alloy material has the advantages that the nano ceramic alloy material provides a convenient and rapid method for repairing disabled ductile iron rollers for steel rolling industry, with remarkable efficiency.

The invention discloses a method for eliminating spiral roll marks on a steel strip surface finishing machine. The method comprises the following steps of: initially washing the roll surface of the finishing machine by using spiral water current; and scraping the roll surface of the finishing machine by using fan-shaped water current, and further washing the roll surface. The invention further discloses a device for eliminating spiral roll marks on the steel strip surface finishing machine. Under the condition of slightly modifying high-pressure washing equipment of the finishing machine, thedefect of spiral roll marks on the steel strip surface finishing machine can be eliminated, the roll replacing times of the finishing machine on a continuous zinc-plating production line can be reduced, and the production cost is greatly lowered.

The invention relates to a plate shape controlling method for an oriented silicon steel plate, and particularly relates to a plate shape controlling method for an oriented silicon steel wedge-shaped plate. The method comprises the following steps: (1) cutting a raw material into equal coils A and B; (2) machining one end of an intermediate roll to be conical, wherein the taper of the last intermediate roll is on the operating side, while the taper of next intermediate roll is on the transmission side; (3) controlling the plate shape by adopting an intermediate roll shaft axial roll shape adjusting mechanism; and (4) controlling the plate shape by adopting an ASU rack radial roll shape adjusting mechanism. According to the method, the shape of a roll gap at the edge of a steel strip is changed by axial movement of the upper and lower intermediate rolls having certain taper at one end, so that the plate shape is adjusted; and according to two wedge-shaped plate coiled materials in different shapes, the changes of the taper length and taper height of one intermediate roll are adjusted, and the effective plane quantity of one intermediate roll is changed, so that the defect that the adjusting range of one side is limited by a limit value when one intermediate roll is adjusted is overcome, and the plate shape adjusting effect is improved.

The invention relates to the field of preparation of rolling mill equipment, in particular to a preparation method of a roll collar for a rolling mill and aims to improve the rolling quality and the rolling efficiency of a wire and rod rolling mill and reduce rolling costs. The preparation method comprises steps as follows: a roll collar base body and a roll collar sleeve are prepared, the roll collar base body is arranged between the inner side wall and the outer side wall of an annular cylinder of the roll collar sleeve, a powder accommodating channel is located above an accommodating cavity in the roll collar sleeve, compaction operation is performed after the alloy powder is injected, and a top cover is mounted at the top of the powder accommodating channel; the roll collar sleeve with the roll collar base body and the alloy powder inside is put into a degassing furnace to be vaccumized and subjected to degassing thermal insulation and then is put into a hot isostatic pressure furnace for hot isostatic pressure treatment; the roll collar is obtained after the roll collar sleeve is removed, and the roll collar is sequentially subjected to annealing treatment, quenching treatment and tempering treatment. The roll collar prepared with the method has better wear resistance and long service life, and the thickness of a work layer is uniform.

The invention relates to the field of disposable sanitary product production processes, in particular to an uncoiling process of a winding coil material. The uncoiling process mainly solves the problem that in the prior art, an uncoiling process of a narrow non-woven fabric winding coil material is adopted to reduce waste of joint wastes as the joints are relatively long and to lower the processing cost. The process comprises the following steps: (1) separately assembling two non-woven fabric winding coils on an unwinding device for emptying; (2) limiting the emptied non-woven fabrics througha round ring limiting device in an early stage; (3) realizing forward overturning of the limited non-woven fabrics at a clamping mechanism by means of clamping roller action on the clamping mechanismfirst and then realizing reverse overturning under the action of another clamping roller; (4) after overturning, arranging a flattening device to flatten the non-woven fabrics to remove folded wrinkles in the overturning process; and (5) carrying out sweat soldering on the flattened non-woven fabrics through a material breaking and connecting device.

The invention relates to the field of iron and steel smelting, in particular to a method for prolonging the service life of a bar slitting and rolling finished product hole. The method for prolongingthe service life of the bar slitting and rolling finished product hole comprises the steps: after the bar is cut, a first-section rolled piece and a tail-section rolled piece are included; the first-section rolled piece and the tail-section rolled piece are conveyed to a finished product hole after being twisted by a twisting guide; the first section rolled piece and the tail section rolled pieceare respectively twisted by the twisting guide; and during twisting, the first rolled piece and the tail rolled piece are twisted in a mirroring mode. The slitting ends are twisted toward the direction of an identifier, so that the slitting ends with higher temperature can be always in contact with the identifier in the finished product hole, and the first end and the second end of the bar with lower temperature can be prevented from being in contact with the identifier in the finished product hole. Therefore, the situation that the finished hole is integrally replaced due to different abrasion degrees of the finished hole caused by uneven temperature can be avoided. Further, the service life of the finished product hole can be effectively prolonged.

The invention provides a rough rolling pass system for flexible rolling of H-shaped steel and a rolling method. The rough rolling pass system is composed of a flat rolling pass and a vertical rolling pass, the flat rolling pass is used for reducing the thickness of a web of a special-shaped billet, compressing the width of a flange and controlling the width of the inner side of the web, the vertical rolling pass is used for vertically pressing the special-shaped billet, the height of the inner side of the web is reduced to different sizes, and intermediate billets required by production of the H-shaped steel of different types are obtained. According to the system, the same roughing mill pass system can produce the intermediate billets required by different types of H-shaped steel. When the H-shaped steel with the same flange width and different types is produced, one roughing mill can finish rolling of multiple types of intermediate billets, rollers of the roughing mill do not need to be replaced, only the finish rolling mill needs to be replaced, the roller replacing frequency is greatly reduced, the production efficiency is improved, and the number of the rollers and the production cost are reduced.

The invention relates to a method for improving the roll grinding rate of a finishing mill. In the method, after a program controlled computer computes the data acquired by an executing computer on the grinding at the last roll grinding rhythm, a grinding time is set to control the executing computer to perform grinding alone in an IN BAR or BAR To BAR manner or in In BAR and BAR TO BAR manners, which can be switched automatically, in a preset mode. The method has the advantages that: the grinding rate of the working roll of the finishing mill is doubled, the surface roughness of the working roll is kept between 1.0 and 1.5 micrometers constantly; the residual abrasion loss of the working roll is reduced; the roll surface transition is smooth and the rebound width of 250 millimeters is realized; annular grooves are not formed on the surface of the roll, local high points on the cross sections of steel strips are eliminated, and the fixed-width rolling amount is up to over 70 kilometers; and meanwhile, the service life of the roll is prolonged, the roll replacement times are reduced, the working efficiency of the finishing mill is improved and the surface quality of the steel strips are improved.

The invention discloses a technological rolling lubricating system of a finish rolling mill for hot-rolled strip steel. The lubricating system comprises a water supply device, an oil supply device and a metering pump station. The oil supply device is connected with oil inlets of the metering pump station by working oil pumps on the oil supply device, the water supply device is connected to a water inlet of an oil and water mixing control unit, the metering pump station is connected to an oil inlet of the oil and water mixing control unit, and the oil and water mixing control unit is connected with a lubricating header. The technological rolling lubricating system has the advantages that the stability of the shape of a roller can be improved, and the service life of the roller can be effectively prolonged; stressed conditions of the surface of the roller can be relieved, accordingly, the roller replacement frequency can be reduced, and the operation time of the roller can be prolonged; rolling force can be reduced, so that electric energy can be saved; the quality of the surface of the strip steel can be improved, so that the pickling ability can be improved after the strip steel is subjected to hot rolling; after rolling oil is applied, a friction coefficient of the inside of a deformation zone is reduced, so that the rolling pressure can be decreased.

The invention discloses a production method with low energy consumption, 24 passes and high efficiency for hot rolling of a phi-8 coiled reinforced bar. The production method comprises four rolling mills for rough milling, six rolling mills for intermediate rolling, four rolling mills for finish rolling of bars and ten rolling mills for finish rolling of wires, wherein 1H to 3H racks roll by adopting a slotless form; 4V to 14V racks and No.15 to No. 24 racks roll by adopting a round / elliptical pass form; the 14V rack produces rolled pieces which are round bars of 24+ / -0.5mm; the pass width of the No.15 rack is 32.1-32.3mm, and the pass height is 16.15-16.30mm. According to the production method disclosed by the invention, by meticulously designing pass parameters of all the passes prior to the wire finish rolling mills for the hot rolling of the phi-8 coiled reinforced bar, and controlling the size and the precision of incoming bars for wire finish rolling, the safety of a motor of the wire finish rolling mill is guaranteed; the elongation percentage is reasonably distributed by the wire finish rolling racks, so that the phi-8 hot-rolled coiled reinforced bars are rolled on the 24 racks. Compared with a mode of rolling by 26 racks in the prior art, the mode disclosed by the invention has the advantages that the consumption of spare parts and the production energy consumption can be greatly reduced, and the production efficiency is improved.

The invention relates to a nitrided high-speed steel roller used for a bar cutting rack and a manufacturing method of the nitrided high-speed steel roller, and belongs to the technical field of roller manufacturing. The nitrided high-speed steel roller comprises a roller neck and a roller body composed of a working layer, a transition layer and a core part. The working layer is composed of, by weight, 1.2-2.2% of carbon, 7.0-13.5% of chromium, 0.2-1.2% of nickel, 0.5-1.5% of molybdenum, 1.0-2.5% of vanadium, 1.0-2.5% of tungsten, 1.0-3.0% of niobium, 0.05-0.1% of rare earth, less than or equal to 0.04% of phosphorus, less than or equal to 0.04% of sulfur, less than or equal to 0.5% of manganese, 0.6-1.5% of silicon and the balance iron. The substrate strength of the working layer is greater than or equal to 600 MPa, and the tensile strength of the working layer is greater than or equal to 800 MPa. The substrate strength of the high-speed steel roller is improved, the grain is refined, the rolling environment requirement of the bar rolling mill cutting rack is met, and the rolling requirement of the cutting rack is met.

The invention discloses a tip device with large radial bearing force. The tip device comprises a tip unit and a tip base, and the tip unit is installed on the tip base; a morse tapered hole is formedin the tip base and used for the tip unit to be placed in; the tip unit comprises a tip core, and a first bearing installing area, a second bearing installing area and a third bearing installing areaare successively arranged on the tip core. The radial bearing force of the tip device is greatly improved, so that the maximum ribbon rolling weight of a ribbon rolling machine every time is increased, the frequency of lap changing is reduced, the loss on defective products is reduced, and the social benefit of the tip device is huge.

The invention discloses an improved two-roller temper mill and a using method, and belongs to the technical field of machining. The improved two-roller temper mill comprises a mill body, a lower working roller, a lower left crease-resisting roller, moving components, an upper left crease-resisting roller, a power component, an upper working roller, an upper right crease-resisting roller and a lower right crease-resisting roller. The power component is arranged on the mill body and provided with the upper working roller and the lower working roller. The upper left crease-resisting roller and the upper right crease-resisting roller are installed on the two sides of the upper working roller, the lower left crease-resisting roller and the lower right crease-resisting roller are installed on the two sides of the lower working roller, and the moving components are arranged on the upper left crease-resisting roller, the lower left crease-resisting roller, the upper right crease-resisting roller and the lower right crease-resisting roller. According to the improved two-roller temper mill, the upper crease-resisting rollers and the lower crease-resisting rollers are used alternately, and thus the upper working roller and the lower working roller alternately generate wrap angles with strip steel; and fatigue stripes can appear on the upper working roller and the lower working roller at the same time, and thus the purposes of reducing the times of replacing the working rollers, improving the productivity, lowering cost and preventing creases of the strip steel are achieved.

A method for a rolling mill to roll round steel with the diameter phi of 120mm and round steel with the diameter phi of 130mm by one roller set includes the ten-pass design of a 650mm rolling mill and a regulating method thereof. The two types of round steel share the first, second, third, fourth and fifth passes and the eighth pass of leader passes. When in rolling of the round steel with the diameter phi of 120mm, the roller gap of the upper rolling line is 6mm, feeding is carried out after 90-degree rotation from the seventh pass to the eighth pass. When in rolling of the round steel with the diameter phi of 130mm, the roller gap of the upper rolling line is regulated to be 11mm, feeding is carried out from the fifth pass to the eighth pass after the sixth pass and the seventh pass are cast off, the third pass and the fifth pass meet the requirement for the entry width of the previous pass in the processes of rolling the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously, the eighth pass meets requirements of the round steel with the diameter phi of 120mm and the round steel with the diameter phi of 130mm simultaneously, the width B of the eighth pass meets requirements of the round steel with the diameter phi of 130mm, and the height H thereof meets requirements of the round steel with the diameter phi of 120mm. By the method, the rolling mill can roll the round steel in two specifications by the same roller set, and roller changing frequency and time due to alternating of the two specifications can be reduced.

The invention relates to a hot rolling forming method of U-shaped steel for a bridge bracket, and belongs to the technical field of a section steel rolling process in the metallurgical industry. According to the technical scheme, the hot rolling forming method includes the steps of rough rolling, multi-slit rolling, finishing forming rolling and finished product rolling; rough rolling is performedby adopting a hole pattern of alternately arranging diamonds and squares, and the last rough rolling hole pattern is a square hole; multi-split rolling adopts an open type hole pattern with upper andlower bidirectional split; finishing forming rolling is three-pass rolling, the hole pattern of first-pass rolling of finishing forming rolling is the open type hole pattern, and the hole pattern ofsecond-pass and third-pass rolling of finishing forming rolling is a closed type hole pattern; and the hole pattern of finished product rolling adopts the open type hole pattern. The hot rolling forming method has the beneficial effects that direct hot rolling forming can be achieved, subsequent machining is omitted, materials are saved, and the finishing product rate is improved by nearly 30%; and the surface stress concentration caused in the machining process is eliminated so that the uniformity of the structure and performance of an entire rolled piece is ensured.

The invention provides a hot-rolled strip steel vertical roller mill machine frame rising and falling structure comprising a bearing base and a machine frame. The machine frame is vertically installedon the bearing base in a sliding manner. Rising and falling devices and adjusting devices are arranged at the position, corresponding to the machine frame, on the bearing base, wherein the rising andfalling devices and the adjusting devices are used for regulating rising and falling of the machine frame. Each rising and falling device comprises a jacking hydraulic cylinder, wherein the jacking hydraulic cylinders are arranged on the portions, corresponding to the periphery of the machine frame, on the bearing base, and connection mechanisms matched with the jacking hydraulic cylinders are arranged on the machine frame. The hot-rolled strip steel vertical roller mill machine frame rising and falling structure is simple in structure, stable and reliable, and multiple work positions can bearranged on each same roller in the height direction; by making the machine frame rise and fall, adjustment of the different work positions is achieved, and the utilization rate of the rollers is increased; by decreasing the number of roller replacement times, the rolling efficiency is improved; and meanwhile, rising and falling of the whole machine frame are achieved through the rising and falling devices, the hot-rolled strip steel vertical roller mill machine frame rising and falling structure can be suitable for changes of rolling elevations under specific conditions, and the application range of mill devices is widened.

The invention discloses a vacuum cleaning system for cold-rolling strip steel. The vacuum cleaning system comprises a vacuum pump, a first vacuum roller, a second vacuum roller, a first vacuum roller suction stop valve, a second vacuum roller suction stop valve, a first vacuum roller back-washing stop valve, a second vacuum roller back-washing stop valve, a back-washing filtered water stop valve and a converse-blowing compressed air stop valve. The first vacuum roller suction stop valve is located on a pipeline between the first vacuum roller and the vacuum pump. The second vacuum roller suction stop valve is located on a pipeline between the second vacuum roller and the vacuum pump. The back-washing filtered water stop valve is located on a pipeline between a filtered water source and the first vacuum roller. The converse-blowing compressed air stop valve is located on a pipeline between a compressed air source and the first vacuum roller. The first vacuum roller back-washing stop valve is installed on a pipeline between the back-washing filtered water stop valve and the first vacuum roller. The vacuum cleaning system for the cold-rolling strip steel can conduct cleaning and dehumidifying treatment on the surface of the strip steel continuously, and meanwhile the roller replacing frequency is reduced.

The invention discloses an improved two-roller temper mill and a using method, and belongs to the technical field of machining. The improved two-roller temper mill comprises a mill body, a lower working roller, a lower left crease-resisting roller, moving components, an upper left crease-resisting roller, a power component, an upper working roller, an upper right crease-resisting roller and a lower right crease-resisting roller. The power component is arranged on the mill body and provided with the upper working roller and the lower working roller. The upper left crease-resisting roller and the upper right crease-resisting roller are installed on the two sides of the upper working roller, the lower left crease-resisting roller and the lower right crease-resisting roller are installed on the two sides of the lower working roller, and the moving components are arranged on the upper left crease-resisting roller, the lower left crease-resisting roller, the upper right crease-resisting roller and the lower right crease-resisting roller. According to the improved two-roller temper mill, the upper crease-resisting rollers and the lower crease-resisting rollers are used alternately, and thus the upper working roller and the lower working roller alternately generate wrap angles with strip steel; and fatigue stripes can appear on the upper working roller and the lower working roller at the same time, and thus the purposes of reducing the times of replacing the working rollers, improving the productivity, lowering cost and preventing creases of the strip steel are achieved.

The invention discloses a method for eliminating spiral roll marks on a steel strip surface finishing machine. The method comprises the following steps of: initially washing the roll surface of the finishing machine by using spiral water current; and scraping the roll surface of the finishing machine by using fan-shaped water current, and further washing the roll surface. The invention further discloses a device for eliminating spiral roll marks on the steel strip surface finishing machine. Under the condition of slightly modifying high-pressure washing equipment of the finishing machine, thedefect of spiral roll marks on the steel strip surface finishing machine can be eliminated, the roll replacing times of the finishing machine on a continuous zinc-plating production line can be reduced, and the production cost is greatly lowered.

The invention discloses a high-speed steel working roll for a hot rolled sheet steckel mill in an iron works. Outer-layer chemical ingredients of the high-speed steel working roll include, by 100% of total mass, C 0.5-3.0%, Si 0.1-2.0%, Mn 0.1-3.0%, P <= 0.1%, S <= 0.03%, Ni 0.3-6.0%, Cr 0.3-8.0%, Mo 2.5-7.5%, V 3.0-8.5%, W 0.1-5.0%, Ti 0.2-2.0%, Mg <= 0.02%, graphite <= 0.2% and the balance Fe and inevitable impurities. The outer-layer chemical ingredients of the high-speed steel working roll are changed, accordingly the high-speed steel working roll for the hot rolled sheet steckel mill in the iron works can be higher that ICDP in hardness and can be almost the same as the ICDP in impact force resistance, products can be rolled to be thinner, and product slipping phenomena can be decreased. If a finish-rolling working roll of the steckel mill is replaced by the high-speed steel working roll for the hot rolled sheet steckel mill in the iron works, the abrasion amount of the roll is very low, the surface accuracy of the produced products is good, the online usage time of the roll is very long, the service life of the roll is prolonged, the roll changing times are decreased, and the productivity and production efficiency are greatly improved.

The invention discloses a preparation method of white cast iron for a roller, and the white cast iron. The preparation method of the white cast iron for the roller comprises the following steps that S1, smelting is conducted, specifically, pig iron, scrap steel, ferrochrome, ferromolybdenum, pure nickel, ferrovanadium and ferrotungsten are added into a furnace to be smelted, so that chemical components of molten iron meet the content requirement of the white cast iron, the temperature is increased, the white molten iron is obtained, and tapping is prepared; S2, outside-furnace treatment is conducted, specifically, yttrium-based heavy rare earth is added along with flow during tapping, inoculation modification treatment is conducted on the white cast iron, then slag removal is conducted, and the chemical components of the white cast iron subjected to outside-furnace treatment meet the content requirement of the white cast iron for the roller; S3, centrifugal casting is conducted; S4, destressing treatment is conducted; S5, processing forming is conducted; and S6, modification treatment is conducted, specifically, the white cast iron roller with the allowance reserved is tempered. The white cast iron prepared by the method for the roller has higher wear resistance, thermal cracking resistance and high red hardness, and the roller prepared from the white cast iron for the roller has the longer service life.

The utility model relates to an anti-nodulation device for a furnace roll surface of a strip steel annealing furnace, which belongs to strip steel heat treatment equipment, and in particular relates to a strip steel continuous annealing furnace. The characteristic is that the nitrogen delivery pipe is provided with an inlet pipeline, and the outlet end of the inlet pipeline is connected to a nitrogen humidification device by a nitrogen gas inlet valve, a pressure reducing valve, a moisture regulating valve, and a dry gas regulating valve, and the nitrogen humidification device is fed into the furnace by moisture. The regulating valve and the injection pipeline are connected to the wet gas nozzle at the bottom of the soaking section of the annealing furnace, and the air intake pipeline, the nitrogen humidification device, the injection pipeline and the annealing furnace form a gas passage. The advantage is that the dew point of the atmosphere in the soaking section of the annealing furnace of the device is -27°C to -35°C, and the gas particles with a high dew point are first enriched at the valley point of the roughness of the non-strip contact surface of the furnace roll, and the high temperature from the heating section The strip steel wraps it, and the gas particles expand when heated, which effectively prevents the sponge iron on the strip steel from sticking to the furnace rolls, improves product quality, reduces the number of times of furnace roll replacement, reduces spare parts costs and production costs, and improves product quality. Product yield and unit operating rate.