CN105522138B - A kind of forged steel roll neck rich chromium cast iron composite roll Processes and apparatus - Google Patents

Abstract

The invention discloses a kind of forged steel roll neck rich chromium cast iron composite roll Processes and apparatus, quality of materials percentages：C:2.4~3.3%, Si:0.60~1.0%, Mn:0.50~1.20%, Ni:0.8~1.2%, Cr:15~20.0%, Mo:0.80~2.2%, W:0.5~1%, P：≤ 0.05%, S：≤ 0.O3%, Sb：1~3%, N：0.02~0.18%, Y:0.1~0.3%, surplus trace element for Fe and inevitably；It is compound inoculated using Rare Earth Y and ferrosilicon, it adds in Sb, N and carries out crystal grain refinement processing, roll mechanical property is improved, roll strength is improved using forged steel roll neck, sensing heater in plug carry out type to integrally heating founding, water mold is molded, can the compound bed boundary of dynamic control, simple process and low cost, without component segregation, roll working life is long.

Description

A kind of forged steel roll neck rich chromium cast iron composite roll Processes and apparatus

Technical field

The invention belongs to metal-pressed machine technical field, more particularly to a kind of forged steel roll neck rich chromium cast iron composite roll work Skill and equipment, the manufacture of composite roll suitable for Steel-rolling Industry.

Background technology

Roll is known as " mothers of steel ", is metal material to be made to generate plastic deformation in the production of the rolling metals such as steel, aluminium, copper Tool, be to determine milling train production efficiency and mill bar quality and the important large component of economy, be mill milling can not or Scarce critical piece and most important large consumable part, consuming cost are about the 5%~15% of Rolling production cost.If Consider the ratio for the factors, then its shared production cost such as the production brought due to roll consumption is shut down, drop is produced and plant maintenance increases It again can higher.

Milling train is the important equipment in metal-pressed machine production, is the aobvious of the national Iron ＆ Steel Development technical merit of measurement one Principal coordinates will.And roll is the chief component of milling train, is the critical component largely consumed in Rolling production, is to determine one The basic guarantee of national rolling technique development level is a national metal material design, material forming technique, fabricate and The intuitive embodiment of the basic industries comprehensive technical levels such as heat treatment.Rolling industry production in, each stocking none be not according to It is shaped by the rolling of roll, this is to say " no roller is good-for-nothing ", so, the quality of roll and effect are most important.

Roll quality is not only related to Rolling production cost and milling train production operational availability, also largely influences stocking Quality.With the development of steel rolling technology, rolling mill speed and the degree of automation are continuously improved, to the resistance to of roll quality particularly roll Mill property, intensity and toughness etc. propose higher requirement.Roller performance is further improved to adapt to the needs of milling train, realizes steel The energy-saving production of section bar is the fresh target that roll development person faces.

China's roll manufacturing industry after decades of development and grow, become roll yield big country of the world, roll at present There is very big development in terms of manufacturing technology and material kind.In terms of roll material, from spheroidal graphite cast-iron, alloy infinitely chilled ductile cast iron Acicular structure spheroidal graphite cast-iron till now, high alloy infinitely chilled ductile cast iron, rich chromium cast iron, hard alloy, semi-high speed steel and High-speed steel etc..It is multiple also to develop to centrifugation from conventional cast single material and press over system casting composite in terms of casting technique Close casting process.Country's roll deliverability has reached 1,000,000 tons or more at present, and design and manufacture ability can reach 120~ 1500000 tons.With China's rolling equipment transformation and constantly introduce advanced milling train from foreign countries, milling train is to automation, continuous Change, heavy-duty direction are developed, and the tissue and performance to roll propose higher requirement.

However, the metallurgical roller rolled steel mean consumption that China voluntarily develops still has larger difference compared with developed countries Away from.Recent statistics from China Steel association, China's steel yield has reached 1,125,570,000 tons within 2014, accounts for global steel production More than 40% amount is calculated according to 1.0~1.2 kg/t steel of loss per ton steel roll, and more than 110~130 ten thousand tons of roll of year consumption, year disappears Consume 20,000,000,000 yuan of roll fund or more.In order to meet the actual needs of Rolling production, China is required for spending a large amount of foreign exchanges every year Import roll, the only high-quality roll of import in 2010 be about more than 3.0 ten thousand ton, and consumption foreign exchange is about more than 200,000,000 dollar.China's roll it is big Amount consumption, causes resource and the huge waste of the energy.In addition, external roll Year's consumption is also above million tons, the market demand Amount is big.So big learies are no matter in terms of the rolling cost from steel rolling mill or the energy and resource consumption from China All it is a huge waste, exerts heavy pressures on to environment and resource.Therefore, roll quality is improved, extends roll campaign, no It is only capable of saving a large amount of foreign exchanges, but also a large amount of roll material can be saved, develops high-quality long-life roll material and its forming Technology can not only meet domestic demand, but also can also be achieved foreign exchange earning.

To meet requirement of the modern rolling industry to high-performance roll, in recent years, the high property of various new is had developed both at home and abroad Energy roll making technology, wherein the technique developed in terms of casting manufactures combination process mainly has：Centrifugally cast composite roll, Continuously casting (CPC) compound vehicle is shallow, electroslag remelting (ESR) composite roll, combined roll etc..

Centrifugally cast composite roll technique（CF）, it is the method production bimetallic composite roll using centrifugal casting.Mainly It is to generate centrifugal force using rotation, molten metal is poured into the casting mold rotated, using centrifugal force the gold poured into a mould Category liquid gets rid of the outer rim to casting mold from rotation center, carries out the solidification ecto-entad sequence of molten metal, is frozen into outer layer as tissue Composite roll of the fine and close high abrasion resisting material, internal layer for common material.The flowing of molten metal contribute to the broken of dendritic crystal and Refinement, while the resistance for overcoming intercrystalline " tunnel " carries out feeding, is improved the consistency of casting.In outer sphere molten metal After solidification, casting mold is sling and is assembled with bottom and top and riser sand mold, core and upper lower impressions are filled with gravity-assist pouring, it is real Existing two kinds of materials it is compound.Centrifugal roller casting manufacture composite roll has the advantages of other casting technique does not have, specifically It is as follows:(1) some components do not need to dead head, effectively improve the service efficiency of molten metal;(2) it does not need to using sand core just The casting of annular and empty tubular can be cast out, while the different cast tube of length and diameter can also be produced, is had good Production efficiency, production cost be not also high;(3) under the influence of centrifugal force, after molten metal solidification, quality is fine and smooth;(4) with this The skin of the roll of method production has higher wearability, and the toughness material of internal layer can guarantee that roll has higher toughness again, With than integral material roll broader practice prospect and higher cost performance.

Although the technique has, equipment is simple, and equipment investment is small, and production efficiency is high, at low cost, suitable for producing it in enormous quantities Feature.But there are following several deficiencies for the technique：

1）When for manufacturing the roll of high alloy material, due to often containing the high alloy of big metric density in material, such as Tungsten, molybdenum, vanadium etc., during centrifugal casting, due to the effect of centrifugal force, the high alloy of these density can be segregated in roller surface, make to roll Roller inner alloy constituent content reduces, and makes tissue and composition uneven so as to deteriorate roller surface layer toughness, reduces skin of the roll Wearability, influence the quality of roll.

2）When the fusing point of core material is higher than the fusing point of cladding material, in the inner surface of the cladding material solidified during cast Generate fused layers.Therefore when core material selects cast steel, it is impossible to obtain good compound interface.

3）The composite roll of the forged steel core with high intensity, high tenacity can not be produced.

Continuous cast outer layer forming process (CPC methods), the technique are that the Nippon Steel Corp of Japan grinds with late 1980s Study carefully exploitation to put into production.CPC methods are to integrate material, technique, equipment, the new and high technology automatically controlled^[10], at present in the world Only Nippon Steel and Hitachi, Ltd is used successfully to industrialized production.Its operation principle is to make roller with forged steel, cast steel or waste or old roll Core applies last layer silicon systems glass protection film on its surface, prevents roller core surface oxidation.Compound outer sphere molten metal will be needed to pour into To between vertically arranged roller core and water mold, the outer layer high-speed steel to make casting fuses completely with roller core, using two sets Electromagnetic induction heater carries out concurrent heating and preheating to molten steel and roller core respectively.The outer sphere molten metal of melting is being fused with roller core Sequence solidification upwards simultaneously, makes the interface of two kinds of materials reach metallurgical binding.It is by stripping equipment, compound good roll is continuous Ground is extracted out from water mold, until composite roll casting complete.In cohesive process, the appearance of roller core surface is micro- molten, makes roller Core and outer layer high speed steel metal realize firm metallurgical binding, improve bond strength.The high-speed steel roller stock of this method production Tissue and grain size are much thinner than centre spinning method, and carbide even dispersion is distributed, and the service life is than centrifugal casting roll It is high by 30%.

The formation of binder course affects the decrease speed of roll, also just determines the production efficiency of CPC methods.This method has Following features:1. the outer layer material of roll can select a variety of high alloy materials, core material can use obdurability and rigidity high Steel based material avoids primary carbie segregation and tissue, composition segregation shortcoming that Centrifugal Cast High Speed Steel Roll occurs；② Molten steel solidifies in water cooling knot product device, and cooling velocity is fast, can obtain tiny, fine and close solidified structure, hot-cracking resistance is good, roll Can be good the features such as;3. consecutive solidification from bottom to top keeps away and has exerted oneself shrinkage cavity and the generation of the casting flaws such as loose；4. it can both manufacture New roll can also carry out old roll remanufacturing reparation.

The shortcomings that CPC is mainly：1. due to using two sets of induction heating systems, equipment is more complicated, and technical difficulty is big；2. by In using stripping mode, production efficiency is relatively low, and the pure crystalline substance degree of the steel produced is poor；3. it needs to carry out molten steel in production process Prolonged heat preservation, energy consumption is big, high to the requirement of tundish refractory material, and production cost is high；4. workshop and operator are required It is high.More than reason is based on, promotes the use of range very little at present, China has not been put to industrialization production so far.

Liquid pouring of electroslag method（ESSLM）, ESSLM is in E.O. bars electric welding research institute invention of the beginning of the nineties in last century 's.Its production technology is put among a copper water mold by compound forging, casting or used waste and old roller Core, then the slag melted in advance is poured into the gap between roller core and crystallizer, it is powered, leads between crystallizer and roller core It crosses molten slag and forms electrical circuit, the heat generated in slag is by the surface melting of roller core, by melted liquid metal with one Fixed technique is poured into the gap between roller core and crystallizer, and liquid metal floats slag, when passing through slag bath by electroslag essence Refining, at the same by roller core cladding get up and the roller core surface preheated with oneself fuse, solidified under the cooling of crystallizer, formed it is compound Layer.In the process, it is constantly extracted out from crystallizer, while constantly pour into liquid metal by stripping device roller core, until Until scheduled length.The material for covering layer can be cast iron, high-speed steel and other metals, and made composite roll both may be used To be used as cold roll, hot roll or Continuous Casting Rolls, and casting clad can be carried out to waste or old roll and is remanufactured.But it strictly to control The time of melt cinder temperature and roller core in melt cinder prevents the fusing that core is excessive, pollutes working lining.

ESSLM technologies allow composite diameter from 100 mm to 1800 mm, even more major diameter billet outer surface.Composite bed 15~20 mm of thickness is to 100 mm or even bigger.The technique is efficient compared with electroslag remelting process, and poring rate is 200~800 kg/h, power consumption is close to 800 kWh/t steel^[10]。

When molten steel injects crystallizer in batches or continuously in the shortcomings that technique predominantly recombination process, since poring rate is non- Often slow, molten steel needs to keep the temperature, and molten steel storage facility is extremely complex and expensive, and the refractory material of holding furnace and steel ladle is by high temperature gold Category liquid washes away for a long time to be caused largely to be lost, and nonmetal inclusion is caused to pollute, long under molten metal overheat and high temperature strongly Time, which preserves, can all cause alloying element and deoxidier to aoxidize and accelerate.The energy expenditure of the process is bigger, and due to using pumping Ingot technique, matching and metal liquid level control technology of the slag temperature with stripping speed are complicated, roller core surface fusion penetration layer control technology difficulty Greatly, low production efficiency.

Although CPC techniques and ESSLM techniques can manufacture the composite bed of big thickness, due to present in technique and equipment The above problem is currently only used for the high-end composite rolls such as high-speed steel of the manufacture less than 10 tons.

Combined roll is that roll is made several components, is mechanically combined.Roll internal layer uses tough Property material, outer layer mostly make carbide ring.This roll can save valuable hard alloy, and sexual valence is higher.Outer layer Carbide ring can ensure roll have very high wearability.But due to carbide ring and internal layer roller core be difficult accomplish it is seamless Engagement, can lead to roll unbalance stress in the operation of rolling and chipping.

Although having been developed that numerous composite roller manufacturing process both at home and abroad, up to the present, do not have also still One composite roll manufacturing process simple for process, production cost is low, performance is good.Therefore, composite roller system is researched and developed Technique and equipment are made, it is current urgent need solution to carry out low cost, high efficiency, high-performance to various material rolls and large-scale roller to manufacture Subject certainly.It is the new direction of composite roll manufacturing technology development.

Cast iron system roll refers to roll of the phosphorus content 2.50~3.5%, by main material can be divided into plain cast iron roll, Four major class of nickel chromium triangle Infinite chilled complex cast iron roll, high Cr complex cast iron roll and alloy nodular cast iron roll.Alloy nodular is cast Iron roll has good heat shock resistance and abrasion resistance properties, is widely used and does large-scale blooming mill, shape rolling mill, bar continuous rolling Machine and large-scale seamless-tube rolling mill roller.The manufacture of centrifugal compound pouring technology can be used in domestic at present mainly use, by manufacturing process Limitation, core use spheroidal graphite cast-iron, since spheroidal graphite cast-iron intensity is low, roll breakage, serious influence easily occur in Rolling production Rolling production and product quality.

At present in rod product, cutting rack and plate sheet and strip, usually using centrifugation bainite roll, this roll It has the following disadvantages in the long-term use：1st, hardness drop is big, the use for the first time of centrifugation bainite roll and last time It uses, material structure changes greatly, and hardness wearability declines comparatively fast, and rolling tonnage can decline 50~70 tons；2nd, thermal fatigue resistance Poor performance, at high operating temperatures, low thermal fatigue resistance leads to roll in use for some time for roll long-term work, easily produces Phenomena such as raw crackle and surface layer chip off-falling, seriously affect rolled piece quality；3rd, the toughness of centrifugation bainite roll is low, brittleness is big, roll breakage Phenomenon happens occasionally.And the material, since graphite is in flat strip shaped, carbide is in reticular structure, so matrix strength is relatively It is low, therefore its wearability still feels insufficient in actual use, service life is not long, and (millimeter amount of rolling is generally 2000~3000 Ton);Secondly as carbide is in reticular structure and the boundary effect in graphite hole so that the heat resistanceheat resistant crack performance of the material Not good enough, made roll can generate fire check in plate strip rolling process, with the increase of amount of rolling, it is therefore desirable to often shut down Roll is replaced, is removed reparation.The production efficiency during class of milling train is not only influenced, increases replacement operation intensity and repair Amount;But also the surface quality of meeting influence of rolled strip, fire check generate the service life repaired and also reduce roll, cause to give birth to It is higher to produce cost.The above problem causes centrifugation bainite roll whole service life shorter, it is impossible to meet the production of high efficiency milling train It is required that.

Rich chromium cast iron is a kind of wear-resistant material of important abrasive wear resistant weld deposit, it has higher hardness, good wear-resisting Property, fracture when the performances such as amount of deflection is small, be widely used for manufacturing the important wear members such as roll in production, with other white cast-iron phases Than showing good comprehensive performance.But it still falls within fragile material, under the larger service condition that is hit, often breaks The failure phenomenons such as broken, fracture show as toughness deficiency, its application is caused to be restricted.

The operation of rolling automatically dynamicization, serialization, heavy-duty be modern rolling technique developing direction.Due to rolled steel Specific demand, higher requirement is proposed to the size of stocking, surface accuracy, the performance of stocking.In addition, with rolling skill The development of art, the working environment of roll are also increasingly harsher.Therefore, for the problems of roll used at present, exploitation Novel roll material improves traditional production technology, and roll is made to meet milling train production requirement, is insider's concern and research Important topic.The new issue faced for the high performance roll of present-day mill outfit as China's roll industry.

Invention content

It is an object of the invention to be directed to oneself to have the deficiency of technology, propose that a kind of simple production process, equipment investment are small, raw Produce that efficient, at low cost, heat crack resistance is good, hardness drop is small, good toughness, a kind of good forged steel roll neck rich chromium cast iron of wearability Composite roll Processes and apparatus solves centre spinning and component segregation easily occurs, and CPC methods, ESR methods production technology are complicated, power consumption Deficiency big, of high cost, that efficiency is low is measured, roll neck is done using forged steel, solves roll breakage problem.

Solving the equipment scheme of its technical problem is:The equipment has a planer-type region directional solidification lifting device 16, Lifting platform 17 is installed on planer-type region directional solidification lifting device 6, being equipped with electromagnetic induction above lifting platform 17 adds Hot device 8 rotates lifting screw 15 by lifting motor 14 or hydraulic test drives lifting platform 17 to be moved down in set speed It is dynamic, the side installation electromagnetic induction electrical power control cabinet 19 of directional solidification lifting device 16, electromagnetic induction power supply in planer-type region Two output terminals of switch board 19 are connected by water-cooled cable 20 with the both ends of electromagnetic induction heating device 8, are determined in planer-type region There is a base support to the lower part of solidification lifting device 16, support plinth 12 is installed on base support 13, in support plinth Water-cooled bottom water tank 11 is installed, the center of bottom water tank 11 is circular through hole, in being equipped with above bottom water tank 11 above 12 The heart is the bottom board 10 of circular through hole, and Combined water cooling crystallizer 7 is equipped with above bottom board 10, is crystallized in water cooling The top of device 7 is equipped with insulation ring 6, the center hole that roll plug 5 passes through support plinth 12, bottom water tank 11 and bottom board 12 The center of crystallizer 7 is fixed on, connection has casting runner 3 in the side of bottom board 10, and casting runner 3 is mounted on base support It on 13 and sits brick 4 with cast to be connected, cast sits that brick 4 is installed above feed trumpet 2, and casting leakage is equipped at the top of feed trumpet Bucket 1, there is pouring ladle 18 above depositing funnel 1.

There are water inlet pipe 23 and outlet pipe 24 respectively in the side of Water-cooled bottom water tank 11；Water mold 7 in crystallizer by justifying The fourplatemold arc water cooling box assembly 7 of equally distributed 2 or 3 integral multiples forms on week, in each arc water cooling box The lower part connection of body component 7 has water inlet pipe 21, and on the top of each arc water cooling box assembly 7, connection has outlet pipe 22, passes through Arc water cooling box assembly 7 is connected into drum-shaped entirety by attachment bolt 9；Insulation ring 6 is resistance to by refractory material or fiber reinforcement Fiery material manufacture；Electromagnetic induction power supply for line-frequency induction power supply, medium frequency induction power supply, high frequency induction power supply, frequency for 500Hz~ 3000Hz。

Solving the process technology scheme of its technical problem use is:

（1）Mandrel prepares and preheating

It is uniform on its surface after the roll mandrel surface of the required size manufactured is carried out oil removing, processing of rust removing first Coat one layer of antioxidizing paint, be put into heating furnace after carrying out being preheating to 500 DEG C~700 DEG C, by support plinth, bottom water tank and The center hole of bottom board is fixed on the center of crystallizer, starting region directional solidification lifting gear, by electromagnetic induction heating Device drops to the bottom of crystallizer, opens the water inlet pipe and water outlet pipe of water mold and bottom water tank, starts electromagnetic induction heating power supply, leads to The sensing heater crossed outside the water mold carries out plug surface heating, to be heated to 840 DEG C~1100 DEG C；

（2）Composition design

The mass percent of forged steel roll neck rich chromium cast iron composite roller operational layer material composition is：C:2.4~3.3%, Si: 0.60~1.0%, Mn:0.50~1.20%, Ni:0.8~1.2%, Cr:15.0~20.0%, Mo:0.80~2.2%, W:0.5~ 1.0%, P：≤ 0.05%, S：≤ 0.O3%, Sb：1~3%, N：0.02~0.18%, Y:0.1~0.3%, surplus is for Fe and not Evitable trace element；

（3）Molten metal melting

Base iron, foundry returns, steel scrap, ferrochrome, molybdenum-iron are weighed by rich chromium cast iron composite roll predetermined material ingredient Alloy, ferro-tungsten, nickel ingot, are placed into melting in intermediate frequency furnace, and carrying out multiple slag making in fusion process skims, and ensure hot metal purifying Degree;When molten iron temperature is 1450~1500 DEG C, sampling is chemically examined, and adjusts each element content until meeting component requirements；

After ladle is toasted, by the Rare Earth Y and Sb, CrN, Si of preheated required weight₃N₄Alloy grain fining agent with 1/3 needs addition silicon iron inoculator to be embedded to together in the pit in the ladle toasted, and covers 0.5~1% roll iron thereon It considers to be worth doing and is compacted, first pour the molten iron of qualified ingredient melted of total amount 2/3, treat after reaction, to add remaining 1/3 iron Water, and the ferrosilicon grain (75SiFe for breeding in total amount remaining 2/3) of preheating is poured into iron notch with stream, it is taken off after being sufficiently stirred Slag plus coverture prepare cast；

（4）Cast

The skin of the roll molten metal bred, micronization processes are good is poured into pouring ladle, by the molten metal in pouring ladle according to It is scheduled cast program by depositing funnel, feed trumpet, casting runner pour into the gap in crystallizer between plug, In casting process, pouring temperature should be controlled in 1350~1380 DEG C of ranges, and starting cast need to flow greatly, after 40~60s, start to subtract stream Slowly it pouring, whole casting process are not greater than 5min, and electromagnetic induction heater does not stop heating, after pouring metal melt, sensing Heater continues heating 10~50 minutes, and poured into a mould molten metal is made to keep liquid within the regular hour, to increase liquid Gu the time makes interface form metallurgical binding, starting region directional solidification lifting gear is by electromagnetic induction heater with certain speed Degree is lifted up, and gradually disengages the roll shaft composite bed of electromagnetic induction heating successively consecutive solidification from bottom to top, and will according to quality It asks and the different rates of climb is controlled in different regions, forming region directional solidification was raised at insulation ring through 5~15 minutes and stops Only, continue to carry out heating 10~50 minutes to insulation ring, to postpone insulated feeder setting time, feeding is carried out to riser, is made multiple The gas and field trash closed in layer molten metal fully floats, and eliminates composite-layer metal casting flaw, stops after reaching the predetermined time Heating continues water flowing and cools down 30 minutes~24 hours, the compound roll shaft cast is taken out out of crystallizer.

（5）Heat treatment process

Rich chromium cast iron composite roll under as cast condition is directly subjected to roughing, then slowly heats up 10~12 in heating furnace H is quenched at 1070 DEG C by roller diameter per 30mm after heat preservation 1h is kept the temperature, then with 15~25 DEG C/h in heating furnace Heat temperature raising speed be heated to 520~560 DEG C, keep the temperature air-cooled after 6~l0h, first time tempering carried out, then again with 25~35 DEG C/heating rate of h is heated to 450~480 DEG C, after keeping the temperature 12~15h, 150 DEG C are furnace-cooled to hereinafter, air-cooled, carries out second Secondary tempering.

The roll mandrel material is forging or cast low alloy steel, medium carbon steel or spheroidal graphite cast-iron.

The 75SiFe innoculant adding quantities are 0.2~0.4%.

The N source materials are CrN and Si₃N₄。

The fourplatemold can both have been realized by adding or reducing various sizes of arc water cooling box assembly The adjustment of fourplatemold inner diameter size in a certain range meets the manufacture of different different-diameter size composite rolls, So as to reduce molding die expense.

The ingredient of the mandrel surface antioxidizing paint be Na2B407, Si02, Na20, K20, A1203, CaO therein one Kind or Multiple components composition.

Advantageous effect

The roll that the methods of the method for the present invention and centre spinning, CPC methods, ESLLM methods produces is very different, master Wanting feature is:

1st, composite roll is manufactured using the invented technology, since special casting method makes molten metal coagulate from bottom to top Gu being conducive to the feeding of liquid metals, the defects of centre spinning is also easy to produce microstructure segregation, manufactured composite roll are overcome Material does not have gravity segregation, and crystalline structure is excellent, even tissue, and the fine and compact degree of crystal grain is high.The choosing of plug and composite material It selects that range is wide, the forging of varying strength requirement or rod cast thereby material and not can be freely selected according to different requirements With the composite material of performance, high alloy material may be used in skin of the roll, makes it have good red hardness and high-temperature wearable Property.

2nd, roll mandrel is directly preheated in crystallizer before cast using electromagnetic induction heater, it is right after cast Roll mandrel and the molten metal poured into a mould are kept the temperature, and reduce the temperature difference between roller core and outer sphere molten metal, are conducive to double Metal material it is good compound, have good mechanical performance.On the other hand in order to reduce casting flaw, metallic composite is allowed It realizes to lower and upper consecutive solidification, the flowing of molten metal automatically from top to bottom is conducive to molten metal feeding from top to bottom, so as to contract The short length in feeding area reduces casting flaw, forms the fine and close composite roll without shrinkage cavity；Continue in casting process to multiple Condensation material carries out electromagnetic induction heating, can reduce the oxidation for by the preheating temperature of composite material, reducing composite material, Ke Yizeng Liquid feeding consolidates the time, and the diffusion for promoting two phase material is more abundant, while can utilize function composite by electromagnetic stirring, increases liquid metals pair By washing away for mandrel material surface, promote the matter and energy exchange between two phase material, make compound bed boundary easily controllable, from And the bond strength at interface is greatly improved, it can realize good metallurgical bonding interface, product quality is easily controllable.

3rd, the present invention is using water mold substitution sand mold and metal mold molding, in roll forming process, due to roll Outer sphere molten metal is the cooled and solidified in water mold, and cooling velocity is high, and nucleation ability is strong, can obtain tiny solidifying of crystal grain Gu tissue, dense structure degree is high, and hardness is uniform, and mechanical property is good, improves the obdurability and thermal fatigue resistance of roll, have compared with The properties having needed for high wearability and cold-resistant, thermal fatigue and modern roll working layer, and with excellent Machinability improves the service life of roll, so as to meet modern rolling steel industry to high-performance, it can be achieved that casting and forging The requirement of roll.Sand mold and metal mold molding are replaced using water mold, the technique recovery rate of casting is high, liquid metals consumption It reduces, 15~30% is saved than sand casting；Rate of metal is high.Product size precision, surface light Zhi Dugao, machinery add remaining At least, while cast(ing) surface is without viscosity sand layer.And quality and dimensionally stable.Meanwhile reduced by very little allowance, it is corresponding to improve Rate of metal, has saved material.

4th, the present invention is cast using water mold, can be completely without molding sand, so reducing the work of molding sand processing Sequence.Casting can be poured into a mould again after going out type simultaneously, thus convenient for doing mechanization and automated production, and production efficiency is high.

5th, due to being molded using water mold, the service life of mold is up to thousands of times or even tens of thousands of times, is greatly saved Modeling Material has been saved, has reduced die cost, due to not having to sand molding, when having saved a large amount of molding sand and moulder, has been improved Efficiency.A large amount of manufacturing expense has been saved, has reduced manufacture cost, has reduced the waste of resource and the energy and the dirt of environment Dye.

6th, it is domestic at present usually using centrifugal compound technique manufacture roll, this roll exist in the long-term use with Lower deficiency：1. hardness drop is big, roll use for the first time and the last time of centrifugal process manufacture use, and material structure changes Greatly, hardness wearability declines very fast, and rolling tonnage can decline 50-70 tons；2. thermal fatigue resistance is poor, roll long-term work exists Under the condition of high temperature, low thermal fatigue resistance leads to roll in use for some time, and it is existing to be also easy to produce crackle and surface layer chip off-falling etc. As seriously affecting rolled piece quality；3. the toughness for centrifuging bainite roll is low, brittleness is big, roll breakage phenomenon happens occasionally.The present invention adopts Composite roll is manufactured with imbedding process, in casting process, although mandrel has carried out the preheating of certain temperature, but relative to being poured For the high temperature fluent metal of note, mandrel material is equivalent to chill effect in casting process, so as to improve cold inside roll But effect, increase roll cast when inside cooling velocity, improve and enhance roll dense internal organization, make interface by Fused layers, diffusion layer and Quench solidification layer composition, reduce the hardness drop of composite material radial direction, and entire composite material is hard It is minimum to spend drop, further improves compound roll shaft performance, manufactured composite roll is made to be repaiied every time in entire service life It is small that service life after multiple reduces amplitude.Meanwhile the present invention is molded using water mold, composite-layer metal liquid is by crystallizer Be quickly cooled down, change composite bed crystalline structure, improve composite material performance, answered through what the technique was manufactured/remanufactured It closes roll and the service life is intended for single use more than new more than 20~30% roll of material used in original.Comprehensive life improves more than 50%.

7th, using the technique and device fabrication composite roll, since using integrally being preheated in type, Quick pouring is molded, region Directional solidification controls crystalline structure, and it is big, right using stripping technique productions low production efficiency, energy consumption to solve CPC methods, ESLLM methods Workshop and operator require high；CPC methods use two sets of induction heating systems, equipment compared with it is complicated, technical difficulty is big, the pure crystalline substance of steel Degree is poor；Matching and metal liquid level control technology of the ESLLM method slag temperature with stripping speed are complicated, roller core surface fusion penetration layer control technology The drawbacks such as difficulty is big have production efficiency more higher than centrifuging process, and overcome present in Centrifugal compound foundry process into The drawbacks of dividing segregation and can not manufacturing forged steel roll neck roll, controllable process parameters are few, and simple production process is easily operated, production effect Rate is high, and power consumption is small, production cost lower than electroslag remelting process 1/2, lower than submerged arc bead welding method 2/3, and equipment is simply invested small, is suitble to Batch production.It can not be limited by equipment and technique, realization manufactures large-sized multilayer laminar joint product with mini-plant Or Gradient Composite Layer product, it is applied widely.

8th, using rare-earth yttrium and Sb, CrN, Si₃N₄, ferrosilicon composite inoculant, improve graphite form, refined crystal grain, made to roll Carbide morphology is significantly improved in roller, improves the strength of materials and toughness.By adding in antimony, make the reticular structure of carbide Obtained basic elimination, organized more disperse, reached the metallographic structure for changing material and performance, make material wearability and Heat resistanceheat resistant crack performance is effectively combined, and improves the amount of rolling of milling train.

9th, roll plug is done using low-alloy steel, medium carbon steel forged steel or cast steel, improves roller neck intensity, Rolling production When core there is no the danger of roll breakage, improve safety, fundamentally solve roll breakage accident, improve production efficiency, meet Requirement of the modern steel industry to high intensity roller core composite roll.It can be used for large-scale top load and HI high impact load roll, As Wide and Thick Slab Heat Working Rolls, high roll-force when wide and heavy plate mill rolls and the big requirement of impact load are met, is carried significantly High working roll service life.

Description of the drawings

Fig. 1 is present device installation diagram, wherein 1 is depositing funnel, 2 be feed trumpet, and 3 be a cast runner, and 4 sit for cast Brick, 5 be roll plug, and 6 be insulation ring, and 7 be fourplatemold, and 8 be electromagnetic induction heater, and 9 be attachment bolt, and 10 is pour Bottom plate is noted, 11 be bottom water tank, and 12 be support plinth, and 13 be base support, and 14 be lifting motor, and 15 be lifting screw, and 16 be dragon Gate-type region directional solidification lifting device, 17 be lifting platform, and 18 be pouring ladle, and 19 electromagnetic induction electrical power control cabinets, 20 be water cooling Cable, 23 be bottom tank inlet pipe, and 24 be bottom radiator drain.

Fig. 2 is fourplatemold structure chart of the present invention, wherein 7 be fourplatemold.

Fig. 3 is fourplatemold arc water cooling babinet modular construction vertical view of the present invention, wherein 21 crystallize for combined type Device water inlet pipe, 22 be fourplatemold outlet pipe, and 7 be crystallizer arc water cooling box assembly.

Fig. 4 is cisten mechanism figure in bottom of the present invention, wherein 11 be bottom water tank.

Fig. 5 is cisten mechanism vertical view in bottom of the present invention, wherein 11 be bottom water tank, 23 be bottom tank inlet pipe, and 24 be bottom water Case outlet pipe.

Fig. 6 repairs roller structure figure for the present invention, wherein 25 be roll working lining, 26 be roll mandrel.

Specific embodiment

With reference to attached drawing, it is as follows to provide the embodiment of the present invention:

Embodiment 1:In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, which has a planer-type region directional solidification lifting Equipment 16 is equipped with lifting platform 17 on planer-type region directional solidification lifting device 6, electricity is equipped with above lifting platform 17 Magnetic induction heaters 8 rotate lifting screw 15 by lifting motor 14 or hydraulic test drive lifting platform 17 with set speed Degree moves up and down, the side installation electromagnetic induction electrical power control cabinet 19 of directional solidification lifting device 16, electromagnetism in planer-type region Two output terminals of induction power supply switch board 19 are connected by water-cooled cable 20 with the both ends of electromagnetic induction heating device 8, at gantry There is a base support in the lower part of formula region directional solidification lifting device 16, support plinth 12 is equipped on base support 13, Water-cooled bottom water tank 11 is installed, the center of bottom water tank 11 is circular through hole, above bottom water tank 11 above support plinth 12 The bottom board 10 that center is circular through hole is installed, Combined water cooling crystallizer 7 is installed above bottom board 10, The top of water mold 7 is equipped with insulation ring 6, and roll plug 5 passes through support plinth 12, bottom water tank 11 and bottom board 12 Center hole is fixed on the center of crystallizer 7, and in the side of bottom board 10, connection has casting runner 3, and casting runner 3 is mounted on It on base support 13 and sits brick 4 with cast to be connected, cast sits that brick 4 is installed above feed trumpet 2, installs at the top of feed trumpet There is sprue cup 1, there is pouring ladle 18 above depositing funnel 1.

There are water inlet pipe 23 and outlet pipe 24 respectively in the side of Water-cooled bottom water tank 11；Water mold 7 in crystallizer by justifying Equally distributed 2 fourplatemolds arc water cooling box assembly 7 forms on week, in each arc water cooling box assembly 7 Lower part connection has water inlet pipe 21, and on the top of each arc water cooling box assembly 7, connection has outlet pipe 22, passes through attachment bolt 9 Arc water cooling box assembly 7 is connected into drum-shaped entirety；Insulation ring 6 is by refractory material or fiber reinforcement refractory material system It makes；Electromagnetic induction power supply is line-frequency induction power supply, medium frequency induction power supply, high frequency induction power supply, frequency 1000Hz.

Roll manufacture uses following processing step：

（1）Mandrel prepares and preheating

It is uniform on its surface after the roll mandrel surface of the required size manufactured is carried out oil removing, processing of rust removing first One layer of antioxidizing paint is coated, is put into heating furnace after carrying out being preheating to 560 DEG C, passes through support plinth, bottom water tank and cast bottom The center hole of plate is fixed on the center of crystallizer, and starting region directional solidification lifting gear declines electromagnetic induction heater To the bottom of crystallizer, the water inlet pipe and water outlet pipe of water mold and bottom water tank is opened, starts electromagnetic induction heating power supply, passes through installation Sensing heater outside water mold carries out plug surface heating, to be heated to 860 DEG C；

（2）Composition design

The mass percent of forged steel roll neck rich chromium cast iron composite roller operational layer material composition is：C:2.6%, Si:0.70%, Mn:0.60%, Ni:0.8%, Cr:17%, Mo:0.80%, W:0.5%, P：≤ 0.05%, S：≤ 0.O3%, Sb：1%, N：0.05%, Y: 0.1%, surplus trace element for Fe and inevitably；

（3）Molten metal melting

By rich chromium cast iron composite roll predetermined material ingredient weigh base iron, foundry returns, steel scrap, ferrotungsten, ferro-molybdenum, Nickel ingot, is placed into melting in intermediate frequency furnace, and carrying out multiple slag making in fusion process skims, and ensures hot metal purifying degree;Work as molten iron temperature When being 1460 DEG C, sampling is chemically examined, and adjusts each element content until meeting component requirements；

After ladle is toasted, by the Rare Earth Y and Sb, Si of preheated required weight₃N₄Alloy grain fining agent and 1/3 Need in the pit being embedded to together in the ladle toasted, cover thereon 0.5~1% roll iron filings and be compacted, first pour total The molten iron of qualified ingredient melted of amount 2/3, after treating spheroidizing reacion, adds remaining 1/3 molten iron, and in iron notch The ferrosilicon grain (75SiFe for breeding in total amount remaining 2/3) of preheating is poured into stream, skims after being sufficiently stirred plus coverture prepares Cast；

（4）Cast

By nodularization, breed, the skin of the roll molten metal that Metamorphism treatment is good is poured into pouring ladle, by the molten metal in pouring ladle According to it is scheduled cast program by depositing funnel, feed trumpet, casting runner pour into the gap in crystallizer between plug In, in casting process, pouring temperature should be controlled in 1370 DEG C of ranges, and starting cast need to flow greatly, after 45s, started to subtract to flow and be poured slowly, Whole casting process are not greater than 5min, and electromagnetic induction heater does not stop heating, after pouring metal melt, sensing heater Continue heating 15 minutes, poured into a mould molten metal is made to keep liquid within the regular hour, consolidates the time to increase liquid, makes boundary Face forms metallurgical binding, and electromagnetic induction heater is lifted up by starting region directional solidification lifting gear with certain speed, The roll shaft composite bed of electromagnetic induction heating successively consecutive solidification from bottom to top is gradually disengaged, and according to quality requirement in different areas The different rates of climb is controlled in domain, forming region directional solidification was raised at insulation ring through 8 minutes and stops, continuing to insulation ring Carry out heating 15 minutes, to postpone insulated feeder setting time, feeding carried out to riser, make gas in composite-layer metal liquid and Field trash fully floats, and eliminates composite-layer metal casting flaw, stops heating after reaching the predetermined time, continues water flowing and cools down 40 points Clock takes out the compound roll shaft cast out of crystallizer.

（5）Heat treatment process

Rich chromium cast iron composite roll is directly subjected to roughing under as cast condition, then slowly heat up 10h in heating furnace, It is quenched after heat preservation 1h is kept the temperature per 30mm by roller diameter at 1070 DEG C, then with the heating liter of 15 DEG C/h in heating furnace Warm speed is heated to 520 DEG C, keeps the temperature air-cooled after 8h, carries out first time tempering, is then heated to again with the heating rate of 25 DEG C/h 450 DEG C, after keeping the temperature 12h, 150 DEG C are furnace-cooled to hereinafter, air-cooled, second of tempering of progress.

The roll mandrel material is forging or cast low alloy steel, medium carbon steel or spheroidal graphite cast-iron.

The 75SiFe innoculant adding quantities are 0.2%.

The N source materials are Si₃N₄。

The ingredient of the mandrel surface antioxidizing paint be Na2B407, Si02, Na20, K20, A1203, CaO therein one Kind or Multiple components composition.

Embodiment 2：In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, which has a planer-type region directional solidification lifting Equipment 16 is equipped with lifting platform 17 on planer-type region directional solidification lifting device 6, electricity is equipped with above lifting platform 17 Magnetic induction heaters 8 rotate lifting screw 15 by lifting motor 14 or hydraulic test drive lifting platform 17 with set speed Degree moves up and down, the side installation electromagnetic induction electrical power control cabinet 19 of directional solidification lifting device 16, electromagnetism in planer-type region Two output terminals of induction power supply switch board 19 are connected by water-cooled cable 20 with the both ends of electromagnetic induction heating device 8, at gantry There is a base support in the lower part of formula region directional solidification lifting device 16, support plinth 12 is equipped on base support 13, Water-cooled bottom water tank 11 is installed, the center of bottom water tank 11 is circular through hole, above bottom water tank 11 above support plinth 12 The bottom board 10 that center is circular through hole is installed, Combined water cooling crystallizer 7 is installed above bottom board 10, The top of water mold 7 is equipped with insulation ring 6, and roll shaft plug 5 passes through support plinth 12, bottom water tank 11 and bottom board 12 Center hole is fixed on the center of crystallizer 7, and in the side of bottom board 10, connection has casting runner 3, and casting runner 3 is mounted on It on base support 13 and sits brick 4 with cast to be connected, cast sits that brick 4 is installed above feed trumpet 2, installs at the top of feed trumpet There is sprue cup 1, there is pouring ladle 18 above depositing funnel 1.

There are water inlet pipe 23 and outlet pipe 24 respectively in the side of Water-cooled bottom water tank 11；Water mold 7 in crystallizer by justifying Equally distributed 3 fourplatemolds arc water cooling box assembly 7 forms on week, in each arc water cooling box assembly 7 Lower part connection has water inlet pipe 21, and on the top of each arc water cooling box assembly 7, connection has outlet pipe 22, passes through attachment bolt 9 Arc water cooling box assembly 7 is connected into drum-shaped entirety；Insulation ring 6 is by refractory material or fiber reinforcement refractory material system It makes；Electromagnetic induction power supply is line-frequency induction power supply, medium frequency induction power supply, high frequency induction power supply, frequency 500Hz.

Roll manufacture uses following processing step：

（1）Mandrel prepares and preheating

It is uniform on its surface after the roll mandrel surface of the required size manufactured is carried out oil removing, processing of rust removing first Coat one layer of antioxidizing paint, be put into heating furnace after carrying out being preheating to 500 DEG C~700 DEG C, by support plinth, bottom water tank and The center hole of bottom board is fixed on the center of crystallizer, starting region directional solidification lifting gear, by electromagnetic induction heating Device drops to the bottom of crystallizer, opens the water inlet pipe and water outlet pipe of water mold and bottom water tank, starts electromagnetic induction heating power supply, leads to The sensing heater crossed outside water mold carries out plug surface heating, to be heated to 890 DEG C；

（2）Composition design

The mass percent of forged steel roll neck rich chromium cast iron composite roller operational layer material composition is：C:2.9%, Si: 0.85%, Mn:0.80%, Ni:1.0%, Cr:18%, Mo:1.2%, W:0.8%, P：≤ 0.05%, S：≤ 0.O3%, Sb：2%, N： 0.10%, Y:0.2%, surplus trace element for Fe and inevitably；

（3）Molten metal melting

By rich chromium cast iron composite roll predetermined material ingredient weigh base iron, foundry returns, steel scrap, ferrotungsten, ferro-molybdenum, Nickel ingot, is placed into melting in intermediate frequency furnace, and carrying out multiple slag making in fusion process skims, and ensures hot metal purifying degree;Work as molten iron temperature When being 1490 DEG C, sampling is chemically examined, and adjusts each element content until meeting component requirements；

After ladle is toasted, by the Rare Earth Y and Sb, Si of preheated required weight₃N₄Alloy grain fining agent and 1/3 Need in the pit being embedded to together in the ladle toasted, thereon cover 0.8% roll iron filings and be compacted, first pour total amount 2/3 molten iron of qualified ingredient melted after treating spheroidizing reacion, adds remaining 1/3 molten iron, and in iron notch with Stream pours into the ferrosilicon grain (75SiFe for breeding in total amount remaining 2/3) of preheating, skims after being sufficiently stirred plus coverture preparation is poured Note；

（4）Cast

By nodularization, breed, the skin of the roll molten metal that Metamorphism treatment is good is poured into pouring ladle, by the molten metal in pouring ladle According to it is scheduled cast program by depositing funnel, feed trumpet, casting runner pour into the gap in crystallizer between plug In, in casting process, pouring temperature should be controlled in 1380 DEG C of ranges, and starting cast need to flow greatly, after 50s, started to subtract to flow and be poured slowly, Whole casting process are not greater than 5min, and electromagnetic induction heater does not stop heating, after pouring metal melt, sensing heater Continue heating 18 minutes, poured into a mould molten metal is made to keep liquid within the regular hour, consolidates the time to increase liquid, makes boundary Face forms metallurgical binding, and electromagnetic induction heater is lifted up by starting region directional solidification lifting gear with certain speed, The roll shaft composite bed of electromagnetic induction heating successively consecutive solidification from bottom to top is gradually disengaged, and according to quality requirement in different areas The different rates of climb is controlled in domain, forming region directional solidification was raised at insulation ring through 10 minutes and stops, continuing to insulation ring Carry out heating 10 minutes, to postpone insulated feeder setting time, feeding carried out to riser, make gas in composite-layer metal liquid and Field trash fully floats, and eliminates composite-layer metal casting flaw, stops heating after reaching the predetermined time, continues water flowing and cools down 60 points Clock takes out the compound roll shaft cast out of crystallizer.

（5）Heat treatment process

Rich chromium cast iron composite roll is directly subjected to roughing under as cast condition, then slowly heat up 11 h in heating furnace, It is quenched after heat preservation 1h is kept the temperature per 30mm by roller diameter at 1070 DEG C, then with the heating of 20 DEG C/h in heating furnace Heating rate is heated to 540 DEG C, air-cooled, progress first time tempering after 9h is kept the temperature, then again with the heating of the heating rate of 30 DEG C/h To 470 DEG C, after keeping the temperature 14h, 150 DEG C are furnace-cooled to hereinafter, air-cooled, second of tempering of progress.

The roll mandrel material is forging or cast low alloy steel, medium carbon steel or spheroidal graphite cast-iron.

The 75SiFe innoculant adding quantities are 0.3%.

The N source materials are Si₃N₄。

Embodiment 3：In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, which has a planer-type region directional solidification lifting device 16, lifting platform 17 is installed on planer-type region directional solidification lifting device 6, electromagnetism sense is installed above lifting platform 17 Heater 8 is answered, lifting screw 15 is rotated by lifting motor 14 or hydraulic test drives lifting platform 17 in set speed Lower movement, the side installation electromagnetic induction electrical power control cabinet 19 of directional solidification lifting device 16, electromagnetic induction in planer-type region Two output terminals of electrical power control cabinet 19 are connected by water-cooled cable 20 with the both ends of electromagnetic induction heating device 8, in planer-type area There is a base support in the lower part of domain directional solidification lifting device 16, support plinth 12 is equipped on base support 13, is supporting Water-cooled bottom water tank 11 is installed, the center of bottom water tank 11 is circular through hole, is installed above bottom water tank 11 above pedestal 12 The bottom board 10 for having center to be circular through hole, is equipped with Combined water cooling crystallizer 7, in water cooling above bottom board 10 The top of crystallizer 7 is equipped with insulation ring 6, the center that roll shaft plug 5 passes through support plinth 12, bottom water tank 11 and bottom board 12 Circular hole is fixed on the center of crystallizer 7, and in the side of bottom board 10, connection has casting runner 3, and casting runner 3 is mounted on pedestal It on stent 13 and sits brick 4 with cast to be connected, cast sits that brick 4 is installed above feed trumpet 2, is equipped with and pours at the top of feed trumpet Funnel 1 is cast, there is pouring ladle 18 above depositing funnel 1.

There are water inlet pipe 23 and outlet pipe 24 respectively in the side of Water-cooled bottom water tank 11；Water mold 7 in crystallizer by justifying Equally distributed 6 fourplatemolds arc water cooling box assembly 7 forms on week, in each arc water cooling box assembly 7 Lower part connection has water inlet pipe 21, and on the top of each arc water cooling box assembly 7, connection has outlet pipe 22, passes through attachment bolt 9 Arc water cooling box assembly 7 is connected into drum-shaped entirety；Insulation ring 6 is by refractory material or fiber reinforcement refractory material system It makes；Electromagnetic induction power supply is line-frequency induction power supply, medium frequency induction power supply, high frequency induction power supply, frequency 2000Hz.

Roll manufacture uses following processing step：

（1）Mandrel prepares and preheating

It is uniform on its surface after the roll mandrel surface of the required size manufactured is carried out oil removing, processing of rust removing first One layer of antioxidizing paint is coated, is put into heating furnace after carrying out being preheating to 650 DEG C, passes through support plinth, bottom water tank and cast bottom The center hole of plate is fixed on the center of crystallizer, and starting region directional solidification lifting gear declines electromagnetic induction heater To the bottom of crystallizer, the water inlet pipe and water outlet pipe of water mold and bottom water tank is opened, starts electromagnetic induction heating power supply, passes through installation Sensing heater outside water mold carries out plug surface heating, to be heated to 900 DEG C；

（2）Composition design

The mass percent of forged steel roll neck rich chromium cast iron composite roller operational layer material composition is：C:3.0%, Si:1.0%, Mn:1.20%, Ni:1.2%, Cr:20.0%, Mo:2.0%, W:1%,P：≤ 0.05%, S：≤ 0.O3%, Sb：3%, N：0.18%, Y: 0.3%, surplus trace element for Fe and inevitably；

（3）Molten metal melting

By rich chromium cast iron composite roll predetermined material ingredient weigh base iron, foundry returns, steel scrap, ferrotungsten, ferro-molybdenum, Nickel ingot is placed into melting in intermediate frequency furnace, and carrying out multiple slag making in fusion process skims, and ensures hot metal purifying degree;When molten iron temperature is At 1500 DEG C, sampling is chemically examined, and adjusts each element content until meeting component requirements；

After ladle is toasted, by the Rare Earth Y and Sb, Si of preheated required weight₃N₄Alloy grain fining agent and 1/3 Need in the pit being embedded to together in the ladle toasted, thereon cover 1% roll iron filings and be compacted, first pour total amount 2/3 The molten iron of qualified ingredient melted, after treating spheroidizing reacion, add remaining 1/3 molten iron, and with stream in iron notch The ferrosilicon grain (75SiFe for breeding in total amount remaining 2/3) of preheating is poured into, skims after being sufficiently stirred plus coverture preparation is poured Note；

（4）Cast

By nodularization, breed, the skin of the roll molten metal that Metamorphism treatment is good is poured into pouring ladle, by the molten metal in pouring ladle According to it is scheduled cast program by depositing funnel, feed trumpet, casting runner pour into the gap in crystallizer between plug In, in casting process, pouring temperature should be controlled in 1360 DEG C of ranges, and starting cast need to flow greatly, after 60s, started to subtract to flow and be poured slowly, Whole casting process are not greater than 5min, and electromagnetic induction heater does not stop heating, after pouring metal melt, sensing heater Continue heating 30 minutes, poured into a mould molten metal is made to keep liquid within the regular hour, consolidates the time to increase liquid, makes boundary Face forms metallurgical binding, and electromagnetic induction heater is lifted up by starting region directional solidification lifting gear with certain speed, The roll shaft composite bed of electromagnetic induction heating successively consecutive solidification from bottom to top is gradually disengaged, and according to quality requirement in different areas The different rates of climb is controlled in domain, forming region directional solidification was raised at insulation ring through 15 minutes and stops, continuing to insulation ring Carry out heating 30 minutes, to postpone insulated feeder setting time, feeding carried out to riser, make gas in composite-layer metal liquid and Field trash fully floats, and eliminates composite-layer metal casting flaw, stops heating after reaching the predetermined time, continues water flowing and cools down 60 points Clock takes out the compound roll shaft cast out of crystallizer.

（5）Heat treatment process

Rich chromium cast iron composite roll is directly subjected to roughing under as cast condition, then slowly heat up 12 h in heating furnace, It is quenched after heat preservation 1h is kept the temperature per 30mm by roller diameter at 1070 DEG C, then with the heating of 25 DEG C/h in heating furnace Heating rate is heated to 560 DEG C, air-cooled, progress first time tempering after 0h is kept the temperature, then again with the heating of the heating rate of 35 DEG C/h To 480 DEG C, after keeping the temperature 15h, 150 DEG C are furnace-cooled to hereinafter, air-cooled, second of tempering of progress.

The roll mandrel material is forging or cast low alloy steel, medium carbon steel or spheroidal graphite cast-iron.

The 75SiFe innoculant adding quantities are 0.4%.

The N source materials are Si₃N₄。

The ingredient of the mandrel surface antioxidizing paint be Na2B407, Si02, Na20, K20, A1203, CaO therein one Kind or Multiple components composition.

Basic principle, main feature and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry For personnel it should be appreciated that the present invention is not limited by step embodiment, that described in step embodiment and specification is the present invention Principle, without departing from the spirit and scope of the present invention, design of the invention can by other various forms implement transport With also having various changes and modifications, these changes and improvements equally all fall within the protetion scope of the claimed invention.The present invention Claimed range is defined by the appending claims and its equivalent thereof.

Claims (8)

1. a kind of forged steel roll neck rich chromium cast iron composite roll technique, it is characterised in that：Roll manufacture uses following processing step：

（1）Mandrel prepares and preheating

After the roll mandrel surface of the required size manufactured is carried out oil removing, processing of rust removing first, uniformly coated on its surface One layer of antioxidizing paint is put into heating furnace after carrying out being preheating to 500 DEG C~700 DEG C, passes through support plinth, bottom water tank and cast The center hole of bottom plate is fixed on the center of crystallizer, and starting region directional solidification lifting gear will be under electromagnetic induction heater The bottom of crystallizer is dropped to, opens the water inlet pipe and water outlet pipe of water mold and bottom water tank, starts electromagnetic induction heating power supply, passes through peace Sensing heater outside water mold carries out plug surface heating, to be heated to 840 DEG C~1100 DEG C；

（2）Composition design

The mass percent of forged steel roll neck rich chromium cast iron composite roller operational layer material composition is：C:2.4~3.3%, Si:0.60 ~1.0%, Mn:0.50~1.20%, Ni:0.8~1.2%, Cr:15.0~20.0%, Mo:0.80~2.2%, W:0.5~1.0%, P：≤ 0.05%, S：≤ 0.O3%, Sb：1~3%, N：0.02~0.18%, Y:0.1~0.3%, surplus is for Fe and unavoidably Trace element；

（3）Molten metal melting

By rich chromium cast iron composite roll predetermined material ingredient weigh base iron, foundry returns, steel scrap, ferrochrome, ferro-molybdenum, Ferro-tungsten, nickel ingot, are placed into melting in intermediate frequency furnace, and carrying out multiple slag making in fusion process skims, and ensure hot metal purifying degree;When When molten iron temperature is 1450~1500 DEG C, sampling is chemically examined, and adjusts each element content until meeting component requirements；

After ladle is toasted, by the Rare Earth Y and Sb, CrN, Si of preheated required weight₃N₄Alloy grain fining agent and 1/3 Addition silicon iron inoculator is needed to be embedded to together in the pit in the ladle toasted, covers roll weight percent 0.5 thereon ~1% roll iron filings are simultaneously compacted, and are first poured the molten iron of qualified ingredient melted of total amount 2/3, are treated after reaction, to add Remaining 1/3 molten iron, and the silicon iron inoculator of preheating is poured into iron notch with stream, that is, breed in total amount remaining 2/3 silicon Iron inovulant, skims after being sufficiently stirred plus coverture prepares cast；

（4）Cast

The skin of the roll molten metal bred, micronization processes are good is poured into pouring ladle, by the molten metal in pouring ladle according to it is pre- Fixed cast program is poured by depositing funnel, feed trumpet, casting runner in the gap in crystallizer between plug, is being poured into a mould In the process, pouring temperature should be controlled in 1350~1380 DEG C of ranges, and starting cast need to flow greatly, after 40~60s, start to subtract stream slowly It pours, whole casting process are not greater than 5min, and electromagnetic induction heater does not stop heating, and after pouring metal melt, sensing adds Hot device continues heating 10~50 minutes, and poured into a mould molten metal is made to keep liquid within the regular hour, is consolidated with increasing liquid Time makes interface form metallurgical binding, and starting region directional solidification lifting gear is by electromagnetic induction heater with certain speed It is lifted up, gradually disengages the roll shaft composite bed of electromagnetic induction heating successively consecutive solidification from bottom to top, and according to quality requirement The different rates of climb is controlled in different regions, forming region directional solidification was raised at insulation ring through 5~15 minutes and stops Only, continue to carry out heating 10~50 minutes to insulation ring, to postpone insulated feeder setting time, feeding is carried out to riser, is made multiple The gas and field trash closed in layer molten metal fully floats, and eliminates composite-layer metal casting flaw, stops after reaching the predetermined time Heating continues water flowing and cools down 30 minutes~24 hours, the compound roll shaft cast is taken out out of crystallizer；

（5）Heat treatment process

Rich chromium cast iron composite roll is directly subjected to roughing under as cast condition, then slowly heat up 10~12 h in heating furnace, It is quenched after heat preservation 1h is kept the temperature per 30mm by roller diameter at 1070 DEG C, then with 15~25 DEG C/h's in heating furnace Heat temperature raising speed is heated to 520~560 DEG C, keeps the temperature air-cooled, progress first time tempering, then again with 25~35 DEG C after 6~l0h The heating rate of/h is heated to 450~480 DEG C, after keeping the temperature 12~15h, is furnace-cooled to 150 DEG C hereinafter, air-cooled, progress second time Fire；

The roll mandrel material is forging or cast low alloy steel, medium carbon steel or spheroidal graphite cast-iron；

The silicon iron inoculator addition is roll weight percent 0.2%；

The N source materials are Si₃N₄。

2. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique, it is characterized in that：The equipment has a planer-type area Domain directional solidification lifting device is equipped with lifting platform, above lifting platform on the directional solidification lifting device of planer-type region Electromagnetic induction heater is installed, lifting screw is rotated by lifting motor or hydraulic test drives lifting platform with set speed Degree moves up and down, the side installation electromagnetic induction electrical power control cabinet of directional solidification lifting device, electromagnetic induction in planer-type region Two output terminals of electrical power control cabinet are connected by water-cooled cable with the both ends of electromagnetic induction heater, are determined in planer-type region There is a base support to the lower part of solidification lifting device, support plinth is installed on base support, above support plinth Water-cooled bottom water tank is installed, the center of bottom water tank is circular through hole, and center is equipped with above the water tank of bottom as circular through hole Bottom board is equipped with Combined water cooling crystallizer above bottom board, and heat preservation is equipped on the top of water mold Circle, roll shaft plug are fixed on the center of crystallizer by the center hole of support plinth, bottom water tank and bottom board, at cast bottom The side connection of plate has casting runner, and casting runner (3) is connected on base support and with cast seat brick, and brick is sat in cast It is installed above to have feed trumpet, depositing funnel at the top of feed trumpet is installed, there is pouring ladle above depositing funnel.

3. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique according to claim 2, it is characterized in that：Water Cooling crystallizer by equally distributed 2 or 3 integral multiples on crystallizer circumference fourplatemold arc water cooling box assembly group Into in the lower part of each arc water cooling box assembly, connection has water inlet pipe, couples on the top of each arc water cooling box assembly There is outlet pipe, arc water cooling box assembly is connected by drum-shaped entirety by attachment bolt.

4. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique according to claim 2, it is characterized in that：Electricity Magnetic induction power supply is line-frequency induction power supply, medium frequency induction power supply, high frequency induction power supply, and frequency is 500Hz~3000Hz.

5. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique according to claim 2, it is characterized in that：It protects Temperature circle is manufactured by refractory material.

6. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique according to claim 2, it is characterized in that：Institute Combined type crystallization can be thus achieved by adding or reducing various sizes of arc water cooling box assembly in the fourplatemold stated The adjustment of device inner diameter size.

7. a kind of equipment for realizing forged steel roll neck rich chromium cast iron composite roll technique according to claim 2, it is characterized in that： There are water inlet pipe and outlet pipe in the side of Water-cooled bottom water tank respectively.

8. forged steel roll neck rich chromium cast iron composite roll technique according to claim 1, it is characterized in that：The mandrel surface oxygen Change the ingredient of coating by Na₂B₄O₇, SiO₂, Na₂O, K₂O, A1₂O₃, CaO is therein one or more into being grouped as.