CN102389959A - Heavy-caliber nodular cast iron pipe heated die quickly cooling process and special die - Google Patents
Heavy-caliber nodular cast iron pipe heated die quickly cooling process and special die Download PDFInfo
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- CN102389959A CN102389959A CN2011103295932A CN201110329593A CN102389959A CN 102389959 A CN102389959 A CN 102389959A CN 2011103295932 A CN2011103295932 A CN 2011103295932A CN 201110329593 A CN201110329593 A CN 201110329593A CN 102389959 A CN102389959 A CN 102389959A
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Abstract
The invention discloses a heavy-caliber nodular cast iron pipe heated die quickly cooling process and a special die. The process comprises the following steps of: firstly, enabling the die to have a temperature suitable for spraying and a smooth inner surface; starting a heat insulation paint spraying system so that heat insulation paint is adhered to the surface of the die and then dried quickly so as to form a continuous heat insulation coating with the thickness of 0.3-0.6mm; then, installing a die core and carrying out pouring and forming; enabling molten iron to retreat along with a pouring truck from one end of the die to the other end while pouring; carrying out primary inoculation on the molten iron on the pouring truck; carrying out secondary inoculation on the molten iron after the molten iron is poured into the die; and finally, pulling a product out of the die after the molten iron is solidified and formed in the die, measuring and controlling the temperature of the die, and clearing the inner surface of the die. According to the invention, a venting plug is not used in the die any more, the appearance quality of the product is improved, the time of cooling and solidification is shortened, the production efficiency is improved, a fine and uniform metallographic structure is obtained, the mechanical property of the product is improved greatly, and better use and popularization values are achieved.
Description
Technical field
The present invention relates to the novel process and the corollary apparatus of the centrifugal production ductile iron pipe of a kind of thermodyn process, fast cold technology of especially a kind of heavy caliber ductile iron pipe hot-die and particular manufacturing craft.
Background technology
At present, the method for existing Surface of Centrifugal Cast Ductile Pipe production spheroidal graphite cast-iron has cold modulus method and thermodyn process.The cold pipe die of spheroidal graphite cast-iron tubular type water that cold modulus method is produced after spun casting is intact, changes the annealing kiln The high temperature anneal over to again, finally obtains ferrite matrix, makes the body percentage elongation high; Thermodyn process is that pipe die is heated to 150 ℃-300 ℃, and in the protection of pipe die inner-wall spraying insulating moulding coating, has cast after process annealing is handled.Because thermodyn process spun cast pipe technology is widely used in the heavy caliber Ductile Pipe Production because of the characteristics that equipment is simple relatively, but long process annealing of pipe die life-span obtains ferrite matrix; Exactly because but the also process characteristic of the slow and consecutive solidification of thermodyn process cooling velocity; Its acquisition organize that crystal grain is big, mechanical property reduces; Physics and chemical segregation are serious, slag blanket is floating gathers, and the trace element influence obviously.
For thermodyn process, the surface of ductile iron pipe depends primarily on the coating quality and the cooling velocity of mould, and the two is relevant with spraying process for cooling and mould structure respectively.The mould that tradition is used all over is uniformly distributed with venting plug, is applicable to thick coating, the old technology that capacity is big, and mould also will regularly remove maintenances such as incrustation scale, redrilling to venting plug, also will change venting plug after long-term the use, and the operation and maintenance cost is high.In addition, the wall thickness of original mould is very thick, can reach more than the 80mm, and the heat in the molten iron is slow through the speed that mould outwards conducts, and can not realize fast cold technology.When coating and outer wall are blocked up, can not cool off fast, the matrix crystal grain of acquisition is thick, slag blanket is floating gathers, and influences the mechanical property of product and the aesthetic measure of tube wall.
Summary of the invention
The technical problem that the present invention will solve provides fast cold technology of a kind of heavy caliber ductile iron pipe hot-die and particular manufacturing craft; When being used for thermodyn process production ductile iron pipe; This fast cold technology can make as-cast structure not have cementite, and the spheroidal graphite cast-iron tubing of being produced is fine and closely woven, mechanical property is high, the characteristics of long service life.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is: a kind of fast cold technology of heavy caliber ductile iron pipe hot-die is characterized in that said technology comprises the steps:
1. cleaning: mould is slowly run, put down the cleaning brush that is installed on the spraying vehicle, open spraying vehicle and move axially along pipe die, cleaning brush friction pipe die inwall, repeated moving, the pipe die inner wall cleaning is clean;
2. spraying: start spraying vehicle, at the adiabatic coating of pipe die inner surface spraying atomizing, adiabatic coating covers behind die surface and is dried rapidly by the temperature of mould, forms continuous heat insulating coating;
3. cast: at the mould female end core is installed, and fixing and locking, pipe die is rotated at a high speed; Start pouring truck, pouring truck is reached pipe die foremost, start fan-shaped bag upset; Molten iron evenly flows into pipe die from fan-shaped bag, opens simultaneously and breeds dispenser, carries out the current-following inoculation first time; After molten iron was full of the mould bellmouth, pouring truck was poured into a mould while retreating, and opened when retreating and bred dispenser the second time that is positioned at the chute front end, and molten iron is carried out breeding the second time;
4. cooling: pouring truck retreats to the mould socket, after the end molten iron fills type, starts outer spray cooling system, and mold outer surface is lowered the temperature, and control molten iron cooling velocity is until the molten steel solidification moulding;
5. withdrawing pattern: pipe die stops the rotation, and the bellmouth core that takes apart a die starts the tube drawing car, and the product of in-mold molding is extracted.
Preferably, said heat insulating coating thickness is 0.3～0.6mm.Pass through control paint finishing translational speed and spraying number of times among the present invention; The final heat insulating coating that obtains 0.3～0.6mm thickness, this heat insulating coating thickness are 0.6～0.8 times of traditional heat insulating coating thickness that is sprayed, and reduce heat insulating coating thickness; The heat that can rapidly high temperature liquid iron be brought passes; And avoid getting angry and cause the mould internal gas pressure to raise, produce waste product, influence product quality because of coating.
Preferably, before the said startup spraying vehicle, need be to opening the adiabatic coating paint finishing on the spraying vehicle, adjustment nozzle atomization effect.The present invention guaranteed the atomizing effect of spraying before using spraying vehicle, make the liquid grain that is sprayed tiny, was vaporific, guaranteed that the coating that is ejected on the mould is even, and can reach said heat insulating coating in the scope of 0.3～0.6mm.
The fast cold particular manufacturing craft of a kind of heavy caliber ductile iron pipe hot-die; Said mould comprises mould bellmouth and mould straight section, and said mould bellmouth is horn-like structure, and its osculum end is connected with the mould straight section; Said mould straight section main body is a cylindrical structure; Its outer surface is intervally distributed with the protruding band that rolls, and the inner surface of said mould bellmouth is a smooth surface, and the inner surface of mould straight section is the smooth conical surface.
Preferably, said mould bellmouth and mould straight section wall thickness are 50～70mm.Through reducing wall thickness, heat dissipation capacity is accelerated among the present invention, shortened molten iron cool time, thereby can cancel the venting plug that is provided with for the adjustment air pressure balance on the original mould, the inner surface that makes said mould bellmouth and mould straight section is a smooth surface.
Adopt the beneficial effect that technique scheme produced to be:
(1) the present invention with the heat insulating coating THICKNESS CONTROL between 0.3～0.6mm; High temperature liquid iron cooling velocity during cooled and solidified in mould is significantly promoted; Promptly obtain fine and closely woven metallographic structure, make mould alternately can use for a long time under the thermal stress effect in producing continuously again, have value for applications preferably;
(2) heat insulating coating thickness and conventional coatings thickness significantly reduce among the present invention; Heat insulating coating between molten iron and mould gas forming amount at high temperature also significantly reduces thereupon; Can cancel the venting plug that is provided with for the adjustment air pressure balance on the original mould; The inner surface that makes mould bellmouth and mould straight section is a smooth surface, improves surface quality of products;
(3) along with the raising of cooling velocity; The mistake speed of cooling of molten iron increases; For avoiding occurring cementite in the as-cast structure, adopted current-following inoculation to add the multistage inoculated technology of mould cavity inoculation, molten iron is carried out breeding for twice; In follow-up, use low-temperature graphitization annealing technology to heat-treat, saved energy resource consumption;
(4) because of the speeding up of cooled and solidified, the process time shortens, and production efficiency is improved.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.
Fig. 1 is a process chart of the present invention;
Fig. 2 is the front view of mould among the present invention;
Fig. 3 is the half sectional view of Fig. 2;
Fig. 4 is the original structure sketch map of mould.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
Can know that according to accompanying drawing 1 the present invention is specifically related to the fast cold technology of a kind of heavy caliber ductile iron pipe hot-die, this technology is when carrying out centrifugal casting spheroidal graphite cast-iron pipe, and the concrete steps that designed are:
The first step: mould is slowly run, put down the cleaning brush that is installed on the spraying vehicle, open spraying vehicle and move axially along pipe die, cleaning brush friction pipe die inwall, repeated moving, the pipe die inner wall cleaning is clean;
Second step: pack up cleaning brush, open the adiabatic coating paint finishing on the spraying vehicle, adjustment nozzle atomization effect; Start spraying vehicle then; At the adiabatic coating of pipe die inner surface spraying atomizing, mould slowly runs on support roller, and paint finishing axially moves in the middle of mould; Adiabatic coating covers behind die surface and is dried rapidly by the temperature of mould, forms continuous heat insulating coating.Control paint finishing translational speed and spraying number of times, finally obtain the coating of 0.3～0.6mm thickness;
The 3rd step: at the mould female end core is installed, and fixing and locking, pipe die is rotated at a high speed;
The 4th step: start pouring truck, pouring truck is reached pipe die foremost, start fan-shaped bag upset, molten iron evenly flows into pipe die from fan-shaped bag, opens simultaneously and breeds dispenser, carries out the current-following inoculation first time;
The 5th step: after molten iron was full of the mould bellmouth, pouring truck was poured into a mould while retreating, and opened when retreating and bred dispenser the second time that is positioned at the chute front end, and molten iron is once being bred;
The 6th step: pouring truck retreats to the mould socket, finishes molten iron and fills type.Start outer spray cooling system, mold outer surface is lowered the temperature, control molten iron cooling velocity is until the molten steel solidification moulding.Pipe die stops the rotation, and the bellmouth core takes apart a die;
The 7th one: start the tube drawing car, the product of in-mold molding is extracted;
The 8th step: the Measurement die temperature, use outer spraying cooling water that mold temperature is reduced in the technological requirement scope, mould gets into next production cycle.
Can be known that by accompanying drawing 2 and 3 employed mould comprises mould bellmouth 1 and mould straight section 2 among the present invention, mould bellmouth 1 is horn-like structure; Its osculum end is connected with mould straight section 2; Said mould straight section 2 main bodys are cylindrical structure, and its outer surface is intervally distributed with protruding rolling and is with 3, and the inner surface of mould bellmouth 1 and mould straight section 2 is a smooth surface; Mould straight section 2 inwalls have tapering, when withdrawing pattern, conveniently extract; Said mould bellmouth 1 is 50-70mm with mould straight section 2 wall thickness.Accompanying drawing 4 is the original structure sketch map of mould, can find out that therefrom original mould all over is uniformly distributed with venting plug, and steam vent distributes and differs 20 °; 18 of every circumference; Difference cloth between axial adjacent two circumferential apertures, it is applicable to thick coating, the old technology that capacity is big, and mould also will regularly be removed maintenances such as incrustation scale, redrilling to venting plug; Also will change venting plug after long-term the use, the operation and maintenance cost is high.Mould after the improvement has removed venting plug, has improved the fineness of mould inner surface, and mould maintenance cost expense significantly reduces, and is applicable to the new technology behind the coating attenuate; The whole wall thickness reduction of pipe die after the improvement more than the 10mm; Make mould heat transmission speed in use significantly improve, the fast cold technology that is achieved, the wall thickness of original mould is thicker; Heat in the molten iron is slow through the speed that mould outwards conducts, and can not realize fast cold technology.
The present invention is through significantly reduce heat insulating coat thickness, strengthen the way of outer cooling in addition; Promptly obtaining no cementite can stress relief annealed matrix; Obtain simultaneously the product of the fine and closely woven no slag blanket of crystal grain, good mechanical performance again; Also because of coating layer thickness is thin, the outward appearance of product will directly embody the fineness (pipe die does not have venting plug) of pipe die inwall, thereby obtain bright and clean surface quality.
Claims (5)
1. the fast cold technology of a heavy caliber ductile iron pipe hot-die is characterized in that said technology comprises the steps:
1. cleaning: mould is slowly run, put down the cleaning brush that is installed on the spraying vehicle, open spraying vehicle and move axially along pipe die, cleaning brush friction pipe die inwall, repeated moving, the pipe die inner wall cleaning is clean;
2. spraying: start spraying vehicle, at the adiabatic coating of pipe die inner surface spraying atomizing, adiabatic coating covers behind die surface and is dried rapidly by the temperature of mould, forms continuous heat insulating coating;
3. cast: at the mould female end core is installed, and fixing and locking, pipe die is rotated at a high speed; Start pouring truck, pouring truck is reached pipe die foremost, start fan-shaped bag upset; Molten iron evenly flows into pipe die from fan-shaped bag, opens simultaneously and breeds dispenser, carries out the current-following inoculation first time; After molten iron was full of the mould bellmouth, pouring truck was poured into a mould while retreating, and opened when retreating and bred dispenser the second time that is positioned at the chute front end, and molten iron is carried out breeding the second time;
4. cooling: pouring truck retreats to the mould socket, after the end molten iron fills type, starts outer spray cooling system, and mold outer surface is lowered the temperature, and control molten iron cooling velocity is until the molten steel solidification moulding;
5. withdrawing pattern: pipe die stops the rotation, and the bellmouth core that takes apart a die starts the tube drawing car, and the product of in-mold molding is extracted.
2. the fast cold technology of a kind of heavy caliber ductile iron pipe hot-die according to claim 1 is characterized in that said heat insulating coating thickness is 0.3～0.6mm.
3. the fast cold technology of a kind of heavy caliber ductile iron pipe hot-die according to claim 1 is characterized in that before the said startup spraying vehicle, need be to opening the adiabatic coating paint finishing on the spraying vehicle, adjustment nozzle atomization effect.
4. the fast cold particular manufacturing craft of a heavy caliber ductile iron pipe hot-die; It is characterized in that said mould comprises mould bellmouth (1) and mould straight section (2), said mould bellmouth (2) is horn-like structure, and its osculum end is connected with mould straight section (2); Said mould straight section (2) main body is a cylindrical structure; Its outer surface is intervally distributed with the protruding band (3) that rolls, and the inner surface of said mould bellmouth (1) is a smooth surface, and the inner surface of mould straight section (2) is the smooth conical surface.
5. the fast cold particular manufacturing craft of a kind of heavy caliber ductile iron pipe hot-die according to claim 4 is characterized in that said mould bellmouth (1) and mould straight section (2) wall thickness are 50-70mm.
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| CN2011103295932A CN102389959A (en) | 2011-10-26 | 2011-10-26 | Heavy-caliber nodular cast iron pipe heated die quickly cooling process and special die |
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| CN2011103295932A CN102389959A (en) | 2011-10-26 | 2011-10-26 | Heavy-caliber nodular cast iron pipe heated die quickly cooling process and special die |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469053A (en) * | 2013-08-28 | 2013-12-25 | 希姆莱斯（大连）科技有限公司 | Spheroidal graphite cast iron foundation pile pipe and preparation process thereof |
| CN104831155A (en) * | 2015-05-26 | 2015-08-12 | 新兴铸管股份有限公司 | Inoculant for nodular cast iron pipe and application of inoculant |
| CN106180584A (en) * | 2016-08-10 | 2016-12-07 | 安徽禹王铸业有限公司 | A kind of flexible anti-shock cast iron pipe preparation technology |
| CN106862518A (en) * | 2017-04-28 | 2017-06-20 | 新兴铸管股份有限公司 | A kind of hot-die centrifuge pours into a mould vehicle control |
| CN110039023A (en) * | 2019-05-20 | 2019-07-23 | 新兴铸管股份有限公司 | Bellmouth device for ductile iron pipe production |
| CN113426977A (en) * | 2021-05-12 | 2021-09-24 | 广东新兴铸管有限公司 | Efficient hot die centrifugal casting production process for nodular cast iron pipe |
| CN114042884A (en) * | 2021-10-27 | 2022-02-15 | 新兴铸管股份有限公司 | Method for manufacturing coating mold core of nodular cast iron pipe |
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Patent Citations (1)
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| CN201154454Y (en) * | 2008-01-04 | 2008-11-26 | 闫国栋 | Device for high-efficiency cleaning inner wall of mold of large caliber nodular cast iron pipe by thermodyn process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469053A (en) * | 2013-08-28 | 2013-12-25 | 希姆莱斯（大连）科技有限公司 | Spheroidal graphite cast iron foundation pile pipe and preparation process thereof |
| CN103469053B (en) * | 2013-08-28 | 2016-06-22 | 于佩 | A kind of Spheroidal graphite cast iron foundation pile pipe and preparation technology thereof |
| CN104831155A (en) * | 2015-05-26 | 2015-08-12 | 新兴铸管股份有限公司 | Inoculant for nodular cast iron pipe and application of inoculant |
| CN106180584A (en) * | 2016-08-10 | 2016-12-07 | 安徽禹王铸业有限公司 | A kind of flexible anti-shock cast iron pipe preparation technology |
| CN106862518A (en) * | 2017-04-28 | 2017-06-20 | 新兴铸管股份有限公司 | A kind of hot-die centrifuge pours into a mould vehicle control |
| CN110039023A (en) * | 2019-05-20 | 2019-07-23 | 新兴铸管股份有限公司 | Bellmouth device for ductile iron pipe production |
| CN113426977A (en) * | 2021-05-12 | 2021-09-24 | 广东新兴铸管有限公司 | Efficient hot die centrifugal casting production process for nodular cast iron pipe |
| CN113426977B (en) * | 2021-05-12 | 2022-12-20 | 广东新兴铸管有限公司 | Efficient hot die centrifugal casting production process for nodular cast iron pipe |
| CN114042884A (en) * | 2021-10-27 | 2022-02-15 | 新兴铸管股份有限公司 | Method for manufacturing coating mold core of nodular cast iron pipe |
| CN114042884B (en) * | 2021-10-27 | 2023-08-22 | 新兴铸管股份有限公司 | Method for manufacturing coating core of spheroidal graphite cast iron pipe |
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Application publication date: 20120328 |