CN103639357B - A kind of preparation method of coal pulverizer mill bowl liner plate - Google Patents
A kind of preparation method of coal pulverizer mill bowl liner plate Download PDFInfo
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- CN103639357B CN103639357B CN201310733055.9A CN201310733055A CN103639357B CN 103639357 B CN103639357 B CN 103639357B CN 201310733055 A CN201310733055 A CN 201310733055A CN 103639357 B CN103639357 B CN 103639357B
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Abstract
The invention discloses the preparation method of a kind of coal pulverizer mill bowl liner plate, belong to abrasion-proof backing block technical field.Step of the present invention is: the preparation of step one, casting sand type; Step 2, fusion process, smelting furnace is adopted to carry out fusion smelting, motlten metal is made up of: C:2.4 ~ 2.5%, Si:0.3 ~ 0.5%, Mn:0.5 ~ 0.8%, Cr:4 ~ 6%, Mo:1.3 ~ 1.7%, Cu:0.8 ~ 1.2%, V:0.3 ~ 0.5%, Sn:0.04 ~ 0.05%, Te:0.02 ~ 0.03%, Ce:0.01 ~ 0.02%, Zr:0.03 ~ 0.04%, P:0.01 ~ 0.02%, S:0.001 ~ 0.002% following component and mass percent thereof, surplus is Fe and inevitable impurity, wherein: Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24; Step 3, casting cycle; Step 4, heat treatment, wherein: wind is quenched to process and carried out on vibration workbench.Method of the present invention is adopted to significantly improve the service life of mill bowl liner plate.
Description
Technical field
The present invention relates to abrasion-proof backing block technical field, more particularly, relate to the preparation method of a kind of coal pulverizer mill bowl liner plate.
Background technology
High-abrasive material is the comparatively special material of a class, and it is used for the occasion that there are wearing and tearing, as: with the interactional machine components of material such as native sand, ore, rock, cement in mining machinery, engineering machinery, powder apparatus; The agricultural machinery such as grain and oil processing, farming harvesting; Many components of machine in water conservancy and steam power plant; The tooth of human body, sole, nib and multiple life product etc.Can say, high-abrasive material is ubiquity in each industrial circles such as metallurgy, building materials, mine, harbour, oil, electric power, coal, chemical industry and military affairs, and everyone life is closely bound up.
The working environment of high-abrasive material is very complicated, some high-abrasive material needs to work under the bad working environments condition such as heavy duty, impact, burn into dust, steam, dregs, usually for occasions such as mine, machinery, water power, coal, harbour, metallurgy, these environment can cause huge loss and the energy waste of high-abrasive material, this part high-abrasive material, in occupation of the main body of high-abrasive material, comprises wear resistant cast iron and abrasion resistant cast steel two large divisions.
Coal-grinding process is that coal is broken and the ever-increasing process of surface area.Increase new surface area, the adhesion between molecular solids must be overcome, thus need consumed energy.Coal is ground into coal dust in coal pulverizer, mainly by crushing, smashing and grind three kinds of modes and carry out.The pattern of coal pulverizer is a lot, and the rotating speed of massage coal workpiece can be divided into three types, i.e. low-speed coal mill, medium-speed pulverizer and high speed coal mill.Mill bowl liner plate in bowl pulverizer is its important abrasion-proof backing block, generally only has 3000 hours the service life of mill bowl liner plate at present, and the service life of how to improve mill bowl liner plate is the technical barrier that machinery manufacturing industry field is badly in need of solving.
By patent retrieval, Chinese Patent Application No. 201310051686.2 discloses a kind of abrasion-proof backing block and preparation method thereof, and the component of this abrasion-proof backing block and mass percent are: carbon: 0.25 ~ 0.30%, manganese: 0.70 ~ 0.90%, silicon: 0.30 ~ 0.60%, chromium: 0.8 ~ 1.10%, molybdenum: 0.15 ~ 0.25%, aluminium: 0.015 ~ 0.050%, zirconium: 0.025 ~ 0.050%, copper≤0.50%, niobium≤0.020%, tin≤0.020%, surplus is iron and inevitable impurity.Its preparation method comprises the following steps: S1, raw material are prepared: according to component and the mass percent preparation raw material of abrasion-proof backing block; S2, casting: carried out by the above-mentioned raw material prepared smelting, moulding by casting, obtain shaping liner plate; S3, dead head cut: above-mentioned shaping liner plate preheating after heat is cut, heat plane; S4, heat treatment: the shaping liner plate after above-mentioned heat plane is carried out surface finish process, normalizing is carried out when being then warming up to 950 ~ 1000 DEG C, quench when temperature is 900 ~ 950 DEG C, insulation after quenching, then to come out of the stove air cooling, be tempering under the condition of 190 ~ 220 DEG C in temperature, be incubated after tempering, namely obtain finished product abrasion-proof backing block.The impact taking into full account various element is needed in high-abrasive material, ability is excavated material potentiality fully, obtain the material of excellent combination mechanical property, further improvement is still needed about the component of abrasion-proof backing block in this application case, and in conjunction with appropriate Technology for Heating Processing, the mill bowl liner plate in higher service life could be obtained.
Summary of the invention
1. invent the technical problem that will solve
The object of the invention is to overcome shorter deficiency in mill bowl liner plate service life in prior art in coal pulverizer, provide the preparation method of a kind of coal pulverizer mill bowl liner plate, adopt technical scheme of the present invention, the hardness of mill bowl liner plate is high, toughness is good, quenching degree good, wearability is strong and high comprehensive performance, thus substantially increases the service life of mill bowl liner plate.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
The preparation method of a kind of coal pulverizer mill bowl liner plate of the present invention, the steps include:
The preparation of step one, casting sand type
The material manufacturing sand mold is made up of following material: casting model powder, furane resins and sulfonic acid solid agent, wherein: the weight of described furane resins is 1.1 ~ 1.25% of casting model powder weight, described sulfonic acid solid agent and the mass ratio of furane resins are 2:5, above-mentioned casting model powder, furane resins and sulfonic acid solid agent are stirred in stirrer for mixing and namely obtain moulding sand for casting in 25 ~ 30 minutes; Adopt the moulding sand for casting of above-mentioned preparation to make the casting sand type of mill bowl liner plate, after casting sand type finishing, leave standstill 2 hours; After leaving standstill, brushing ground floor coating on casting sand type, this ground floor coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for ground floor coating is 65%, the thickness of ground floor coating is 1.0 ~ 1.2mm, burns knot after brushing to ground floor coating point; After ground floor coating point burns knot, use gas purging casting sand type, and on casting sand type brushing second layer coating, this second layer coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for second layer coating is 45%, the thickness of second layer coating is 0.8 ~ 1.0mm, burns knot after brushing to second layer coating point; After second layer coating point burns knot, brushing releasing agent in casting sand type;
Step 2, fusion process
Smelting furnace is adopted to carry out fusion smelting, first steel scrap is added smelting furnace, when the temperature in smelting furnace reaches 1520 ~ 1530 DEG C, in smelting furnace, add alloy carry out alloying and add slag former, after deoxidation treatment, the metal after melting is poured containing V, Sn, Te, Ce, in the casting ladle of Zr batching, motlten metal is made up of: C:2.4 ~ 2.5% following component and mass percent thereof, Si:0.3 ~ 0.5%, Mn:0.5 ~ 0.8%, Cr:4 ~ 6%, Mo:1.3 ~ 1.7%, Cu:0.8 ~ 1.2%, V:0.3 ~ 0.5%, Sn:0.04 ~ 0.05%, Te:0.02 ~ 0.03%, Ce:0.01 ~ 0.02%, Zr:0.03 ~ 0.04%, P:0.01 ~ 0.02%, S:0.001 ~ 0.002%, surplus is Fe and inevitable impurity, wherein: Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24,
Step 3, casting cycle
Cast in the die cavity of step one casting sand type by the motlten metal of step 2 melting, cast temperature is 1480 ~ 1490 DEG C, and casting terminates rear cooling naturally 1.5 hours, unpacks and clear up foundry goods after cooling;
Step 4, heat treatment
Heat-treat the mill bowl liner plate foundry goods that step 3 obtains, its process is as follows:
1) will grind bowl liner plate foundry goods loads in heat-treatment furnace, controls to be warming up to 190 DEG C, be incubated 110 minutes with the heating rate of 5 DEG C/min; Control to be warming up to 390 DEG C with the heating rate of 7 DEG C/min again, be incubated 90 minutes; Control to be warming up to 640 DEG C with the heating rate of 10 DEG C/min again, be incubated 70 minutes; Control to be warming up to 830 DEG C with the heating rate of 6 DEG C/min again, be incubated 60 minutes; Control to be warming up to 1022 DEG C with the heating rate of 3 DEG C/min again, be incubated and go out heat-treatment furnace after 220 minutes;
2) the mill bowl liner plate foundry goods after step 1) process is carried out wind to quench process, wind is quenched to process and is carried out on vibration workbench, before mill bowl liner plate foundry goods is poured over vibration workbench, open vibration workbench, the vibration frequency vibrating workbench is made to be 16 ~ 18Hz, the amplitude of vertical direction is 10 ~ 20cm, and open temperature-dropping fan simultaneously and carry out wind and to quench process, when the surface temperature of grinding bowl liner plate foundry goods is down to 640 DEG C, it is 390 DEG C that closedown temperature-dropping fan makes mill bowl liner plate foundry goods naturally cool to surface temperature, now, close the vibrating device of vibration workbench and reopen temperature-dropping fan, until mill bowl liner plate foundry goods is cooled to normal temperature,
3) by step 2) process after mill bowl liner plate foundry goods again load in heat-treatment furnace, be handled as follows:
First time tempering: control to be warming up to 180 DEG C with the heating rate of 15 DEG C/min, be incubated 20 minutes; Control to be warming up to 320 DEG C with the heating rate of 20 DEG C/min again, be incubated 25 minutes; Control to be warming up to 390 DEG C with the heating rate of 10 DEG C/min again, be incubated 230 minutes, cool with stove after insulating process terminates;
Second time tempering: control to be warming up to 170 DEG C with the heating rate of 12 DEG C/min, be incubated 25 minutes; Control to be warming up to 310 DEG C with the heating rate of 18 DEG C/min again, be incubated 22 minutes; Control to be warming up to 410 DEG C with the heating rate of 13 DEG C/min again, be incubated 220 minutes, cool with stove after insulating process terminates;
Third time tempering: control to be warming up to 200 DEG C with the heating rate of 17 DEG C/min, be incubated 20 minutes; Control to be warming up to 300 DEG C with the heating rate of 18 DEG C/min again, be incubated 25 minutes; Control to be warming up to 400 DEG C with the heating rate of 8 DEG C/min again, be incubated 210 minutes, with stove cooling after insulating process terminates, bowl liner plate must be ground.
Preferably, the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.45%, Si:0.4%, Mn:0.6%, Cr:5.1%, Mo:1.5%, Cu:1.0%, V:0.4%, Sn:0.045%, Te:0.026%, Ce:0.014%, Zr:0.035%, P:0.016%, S:0.0014%, and surplus is Fe and inevitable impurity.
Preferably, the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.4%, Si:0.5%, Mn:0.5%, Cr:6%, Mo:1.3%, Cu:1.2%, V:0.3%, Sn:0.05%, Te:0.02%, Ce:0.02%, Zr:0.03%, P:0.02%, S:0.001%, and surplus is Fe and inevitable impurity.
Preferably, the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.5%, Si:0.3%, Mn:0.8%, Cr:4%, Mo:1.7%, Cu:0.8%, V:0.5%, Sn:0.04%, Te:0.03%, Ce:0.01%, Zr:0.04%, P:0.01%, S:0.002%, and surplus is Fe and inevitable impurity.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, there is following remarkable result:
The preparation method of a kind of coal pulverizer mill bowl liner plate of the present invention, by adding with Si in mill bowl liner plate motlten metal, Mn, Cr is main alloying element and a small amount of Mo, Cu, V, Sn, Te, Ce, Zr alloying element, and control Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24, compound hardening treatment is carried out to mill bowl liner plate, improve tissue and the quenching degree of mill bowl liner plate, adopt rational casting method simultaneously, Cr is given full play to by fusion process and heat treatment process, Mo, Cu, V, Sn, Te, Ce, the effect of Zr, improve toughness and the anti-wear performance of mill bowl liner plate, reach the combination property needed for coal pulverizer mill bowl liner plate far away, the quality of obtained mill bowl liner plate finished product is good, service life improves nearly three times, the service life of existing mill bowl liner plate generally only has 3000 hours, mill bowl liner plate of the present invention reaches 8000 ~ 10000 hours service life.
Detailed description of the invention
For understanding content of the present invention further, below in conjunction with embodiment, the invention will be further described.
Embodiment 1
A kind of coal pulverizer mill bowl liner plate of the present embodiment, this mill bowl liner plate offers installing hole.Grind bowl liner plate in the present invention to be made up of following component and mass percent thereof: C:2.4 ~ 2.5%, Si:0.3 ~ 0.5%, Mn:0.5 ~ 0.8%, Cr:4 ~ 6%, Mo:1.3 ~ 1.7%, Cu:0.8 ~ 1.2%, V:0.3 ~ 0.5%, Sn:0.04 ~ 0.05%, Te:0.02 ~ 0.03%, Ce:0.01 ~ 0.02%, Zr:0.03 ~ 0.04%, P:0.01 ~ 0.02%, S:0.001 ~ 0.002%, surplus is Fe and inevitable impurity, wherein: Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24.The concrete bowl liner plate that grinds in the present embodiment is made up of following component and mass percent thereof: C:2.45%, Si:0.4%, Mn:0.6%, Cr:5.1%, Mo:1.5%, Cu:1.0%, V:0.4%, Sn:0.045%, Te:0.026%, Ce:0.014%, Zr:0.035%, P:0.016%, S:0.0014%, surplus is Fe and inevitable impurity.
The preparation method of a kind of coal pulverizer mill bowl liner plate of this embodiment, the steps include:
The preparation of step one, casting sand type
The material manufacturing sand mold is made up of following material: casting model powder, furane resins and sulfonic acid solid agent, casting model powder in the present embodiment is made up of following component and mass percent thereof: 23% natural silica Sand, 35% chromite sand, 16% olivine sand, 18% nice foundry sand and 8% magnesia, casting model powder in the present embodiment adopts polytype casting model powder to coordinate and forms, the molten metal temperature equilibrium of casting can be prevented, prevent shrinkage cavity.Wherein: the weight of described furane resins is 1.15% of casting model powder weight, described sulfonic acid solid agent and the mass ratio of furane resins are 2:5, above-mentioned casting model powder, furane resins and sulfonic acid solid agent are stirred in stirrer for mixing and namely obtain moulding sand for casting in 28 minutes; Adopt the moulding sand for casting of above-mentioned preparation to make the casting sand type of mill bowl liner plate, after casting sand type finishing, leave standstill 2 hours; After leaving standstill, brushing ground floor coating on casting sand type, this ground floor coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for ground floor coating is 65%, the thickness of ground floor coating is 1.1mm, burns knot after brushing to ground floor coating point; After ground floor coating point burns knot, use gas purging casting sand type, and on casting sand type brushing second layer coating, this second layer coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for second layer coating is 45%, the thickness of second layer coating is 0.9mm, burns knot after brushing to second layer coating point; After second layer coating point burns knot, brushing releasing agent in casting sand type, releasing agent in the present embodiment is made up of following component and mass percent thereof: 6% furnace cloth bag dust-removing ash, 7% titanium dioxide, 5% are without calcium chromium slag, 18% white fused alumina, 23% lime stone, 17% methyl-silicone oil, 15% hydroxy silicon oil, 9% APES, adopt the releasing agent of the present embodiment configuration, the fineness of cast(ing) surface can be ensured, and then reduce the polishing time, improve casting product quality.
Step 2, fusion process
Smelting furnace is adopted to carry out fusion smelting, first steel scrap is added smelting furnace, when the temperature in smelting furnace reaches 1520 ~ 1530 DEG C, in smelting furnace, add alloy carry out alloying and add slag former, after deoxidation treatment, the metal after melting is poured containing V, Sn, Te, Ce, in the casting ladle of Zr batching, motlten metal is made up of: C:2.45% following component and mass percent thereof, Si:0.4%, Mn:0.6%, Cr:5.1%, Mo:1.5%, Cu:1.0%, V:0.4%, Sn:0.045%, Te:0.026%, Ce:0.014%, Zr:0.035%, P:0.016%, S:0.0014%, surplus is Fe and inevitable impurity.Be described in detail as follows about the Partial Elements of motlten metal in this present invention: 1) Cr is one of basic element of high-abrasive material, can solution strengthening matrix, improve the quenching degree of steel, wearability and corrosion resistance, impact toughness is not reduced while raising hardness and intensity, have higher tempering resistivity, chrome content controls 4 ~ 6%.2) Cu can increase the quenching degree of steel, refinement matrix, and the nanoscale Cu phase particle of Precipitation has stronger precipitation strength effect, and copper content controls 0.8 ~ 1.2%.3) V energy crystal grain thinning, improve matrix strength and impact flexibility, the carbide of vanadium all has higher hardness, can significantly improve the anti-wear performance of material, meanwhile, vanadium is solid-solution in steel can significantly improve quenching degree, also has certain precipitation-hardening effect, but too high vanadium then strengthening effect is saturated, therefore, vanadium content controls 0.3 ~ 0.5%.4) Te, Ce, Zr element all has very strong solution strengthening effect, Te, Ce, Zr can form non-spontaneous nucleating center, thus crystal grain thinning, improve the comprehensive mechanical property of material, but its ratio must control in the scope of Te:0.02 ~ 0.03%, Ce:0.01 ~ 0.02%, Zr:0.03 ~ 0.04%; In addition, add the Te of 0.02 ~ 0.03% weight in the present embodiment and can be used for controlled cooling model crystallized depth.5) ratio of Cr, Cu, Sn three must control in Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24, coordinating under suitable Technology for Heating Processing excavated material potentiality to greatest extent, the material of excellent combination mechanical property could be obtained.
Step 3, casting cycle
The motlten metal of step 2 melting is cast in the die cavity of step one casting sand type, cast temperature is 1480 ~ 1490 DEG C, cast temperature in the present embodiment is 1485 DEG C, and casting terminates rear cooling naturally 1.5 hours, unpacks and clear up foundry goods after cooling.
Step 4, heat treatment
Heat-treat the mill bowl liner plate foundry goods that step 3 obtains, its process is as follows:
1) will grind bowl liner plate foundry goods loads in heat-treatment furnace, controls to be warming up to 190 DEG C, be incubated 110 minutes with the heating rate of 5 DEG C/min; Control to be warming up to 390 DEG C with the heating rate of 7 DEG C/min again, be incubated 90 minutes; Control to be warming up to 640 DEG C with the heating rate of 10 DEG C/min again, be incubated 70 minutes; Control to be warming up to 830 DEG C with the heating rate of 6 DEG C/min again, be incubated 60 minutes; Control to be warming up to 1022 DEG C with the heating rate of 3 DEG C/min again, be incubated and go out heat-treatment furnace after 220 minutes;
2) the mill bowl liner plate foundry goods after step 1) process is carried out wind to quench process, wind is quenched to process and is carried out on vibration workbench, before mill bowl liner plate foundry goods is poured over vibration workbench, open vibration workbench, the vibration frequency vibrating workbench is made to be 16 ~ 18Hz, the amplitude of vertical direction is 10 ~ 20cm, the vibration frequency vibrating workbench in the present embodiment is 17Hz, the amplitude of vertical direction is 14cm, and open temperature-dropping fan simultaneously and carry out wind and to quench process, when the surface temperature of grinding bowl liner plate foundry goods is down to 640 DEG C, it is 390 DEG C that closedown temperature-dropping fan makes mill bowl liner plate foundry goods naturally cool to surface temperature, now, close the vibrating device of vibration workbench and reopen temperature-dropping fan, until mill bowl liner plate foundry goods is cooled to normal temperature,
3) by step 2) process after mill bowl liner plate foundry goods again load in heat-treatment furnace, be handled as follows:
First time tempering: control to be warming up to 180 DEG C with the heating rate of 15 DEG C/min, be incubated 20 minutes; Control to be warming up to 320 DEG C with the heating rate of 20 DEG C/min again, be incubated 25 minutes; Control to be warming up to 390 DEG C with the heating rate of 10 DEG C/min again, be incubated 230 minutes, cool with stove after insulating process terminates;
Second time tempering: control to be warming up to 170 DEG C with the heating rate of 12 DEG C/min, be incubated 25 minutes; Control to be warming up to 310 DEG C with the heating rate of 18 DEG C/min again, be incubated 22 minutes; Control to be warming up to 410 DEG C with the heating rate of 13 DEG C/min again, be incubated 220 minutes, cool with stove after insulating process terminates;
Third time tempering: control to be warming up to 200 DEG C with the heating rate of 17 DEG C/min, be incubated 20 minutes; Control to be warming up to 300 DEG C with the heating rate of 18 DEG C/min again, be incubated 25 minutes; Control to be warming up to 400 DEG C with the heating rate of 8 DEG C/min again, be incubated 210 minutes, with stove cooling after insulating process terminates, bowl liner plate must be ground.
The Technology for Heating Processing of the present embodiment, for grinding the component of bowl liner plate motlten metal and mass percent particular design thereof in the present invention, result of the test confirms, grind in the present invention and add with Si in bowl liner plate motlten metal, Mn, Cr is main alloying element and a small amount of Mo, Cu, V, Sn, Te, Ce, Zr alloying element, and control Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24, compound hardening treatment is carried out to mill bowl liner plate, improve tissue and the quenching degree of mill bowl liner plate, adopt rational casting method simultaneously, Cr is given full play to by fusion process and specific heat treatment process, Mo, Cu, V, Sn, Te, Ce, the effect of Zr, improve toughness and the anti-wear performance of mill bowl liner plate, make the mill bowl liner plate significant prolongation in service life of the present embodiment.
The mill bowl liner plate of the present embodiment, its hardness is 63HRC, and tensile strength is 1540Mpa, and yield strength is 1258Mpa, and percentage elongation is 9%, in temperature for impact flexibility when-40 DEG C is 21J/cm
2, the service life in coal pulverizer reaches 10000 hours.
Embodiment 2
A kind of coal pulverizer mill bowl liner plate of the present embodiment, this mill bowl liner plate is made up of following component and mass percent thereof: C:2.4%, Si:0.5%, Mn:0.5%, Cr:6%, Mo:1.3%, Cu:1.2%, V:0.3%, Sn:0.05%, Te:0.02%, Ce:0.02%, Zr:0.03%, P:0.02%, S:0.001%, and surplus is Fe and inevitable impurity.The preparation method of the present embodiment and result of use thereof are substantially with embodiment 1.
The mill bowl liner plate of the present embodiment, its hardness is 63HRC, and tensile strength is 1536Mpa, and yield strength is 1259Mpa, and percentage elongation is 9%, in temperature for impact flexibility when-40 DEG C is 19J/cm
2, the service life in coal pulverizer reaches 9000 hours.
Embodiment 3
A kind of coal pulverizer mill bowl liner plate of the present embodiment, this mill bowl liner plate is made up of following component and mass percent thereof: C:2.5%, Si:0.3%, Mn:0.8%, Cr:4%, Mo:1.7%, Cu:0.8%, V:0.5%, Sn:0.04%, Te:0.03%, Ce:0.01%, Zr:0.04%, P:0.01%, S:0.002%, and surplus is Fe and inevitable impurity.The preparation method of the present embodiment and result of use thereof are substantially with embodiment 1.
The mill bowl liner plate of the present embodiment, its hardness is 62HRC, and tensile strength is 1535Mpa, and yield strength is 1260Mpa, and percentage elongation is 9%, in temperature for impact flexibility when-40 DEG C is 20J/cm
2, the service life in coal pulverizer reaches 9800 hours.
Claims (4)
1. a preparation method for coal pulverizer mill bowl liner plate, is characterized in that, the steps include:
The preparation of step one, casting sand type
The material manufacturing sand mold is made up of following material: casting model powder, furane resins and sulfonic acid solid agent, wherein: the weight of described furane resins is 1.1 ~ 1.25% of casting model powder weight, described sulfonic acid solid agent and the mass ratio of furane resins are 2:5, above-mentioned casting model powder, furane resins and sulfonic acid solid agent are stirred in stirrer for mixing and namely obtain moulding sand for casting in 25 ~ 30 minutes; Adopt the moulding sand for casting of above-mentioned preparation to make the casting sand type of mill bowl liner plate, after casting sand type finishing, leave standstill 2 hours; After leaving standstill, brushing ground floor coating on casting sand type, this ground floor coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for ground floor coating is 65%, the thickness of ground floor coating is 1.0 ~ 1.2mm, burns knot after brushing to ground floor coating point; After ground floor coating point burns knot, use gas purging casting sand type, and on casting sand type brushing second layer coating, this second layer coating is made up of Brown Alundum and alcohol, wherein: the mass percent that Brown Alundum accounts for second layer coating is 45%, the thickness of second layer coating is 0.8 ~ 1.0mm, burns knot after brushing to second layer coating point; After second layer coating point burns knot, brushing releasing agent in casting sand type;
Step 2, fusion process
Smelting furnace is adopted to carry out fusion smelting, first steel scrap is added smelting furnace, when the temperature in smelting furnace reaches 1520 ~ 1530 DEG C, in smelting furnace, add alloy carry out alloying and add slag former, after deoxidation treatment, the metal after melting is poured containing V, Sn, Te, Ce, in the casting ladle of Zr batching, motlten metal is made up of: C:2.4 ~ 2.5% following component and mass percent thereof, Si:0.3 ~ 0.5%, Mn:0.5 ~ 0.8%, Cr:4 ~ 6%, Mo:1.3 ~ 1.7%, Cu:0.8 ~ 1.2%, V:0.3 ~ 0.5%, Sn:0.04 ~ 0.05%, Te:0.02 ~ 0.03%, Ce:0.01 ~ 0.02%, Zr:0.03 ~ 0.04%, P:0.01 ~ 0.02%, S:0.001 ~ 0.002%, surplus is Fe and inevitable impurity, wherein: Cr/Cu=5.0 ~ 5.2, Cu/Sn=20 ~ 24,
Step 3, casting cycle
Cast in the die cavity of step 2 casting sand type by the motlten metal of step 3 melting, cast temperature is 1480 ~ 1490 DEG C, and casting terminates rear cooling naturally 1.5 hours, unpacks and clear up foundry goods after cooling;
Step 4, heat treatment
Heat-treat the mill bowl liner plate foundry goods that step 3 obtains, its process is as follows:
1) will grind bowl liner plate foundry goods loads in heat-treatment furnace, controls to be warming up to 190 DEG C, be incubated 110 minutes with the heating rate of 5 DEG C/min; Control to be warming up to 390 DEG C with the heating rate of 7 DEG C/min again, be incubated 90 minutes; Control to be warming up to 640 DEG C with the heating rate of 10 DEG C/min again, be incubated 70 minutes; Control to be warming up to 830 DEG C with the heating rate of 6 DEG C/min again, be incubated 60 minutes; Control to be warming up to 1022 DEG C with the heating rate of 3 DEG C/min again, be incubated and go out heat-treatment furnace after 220 minutes;
2) by step 1) mill bowl liner plate foundry goods after process carries out wind and to quench process, wind is quenched to process and is carried out on vibration workbench, before mill bowl liner plate foundry goods is poured over vibration workbench, open vibration workbench, the vibration frequency vibrating workbench is made to be 16 ~ 18Hz, the amplitude of vertical direction is 10 ~ 20cm, and open temperature-dropping fan simultaneously and carry out wind and to quench process, when the surface temperature of grinding bowl liner plate foundry goods is down to 640 DEG C, it is 390 DEG C that closedown temperature-dropping fan makes mill bowl liner plate foundry goods naturally cool to surface temperature, now, close the vibrating device of vibration workbench and reopen temperature-dropping fan, until mill bowl liner plate foundry goods is cooled to normal temperature,
3) by step 2) process after mill bowl liner plate foundry goods again load in heat-treatment furnace, be handled as follows:
First time tempering: control to be warming up to 180 DEG C with the heating rate of 15 DEG C/min, be incubated 20 minutes; Control to be warming up to 320 DEG C with the heating rate of 20 DEG C/min again, be incubated 25 minutes; Control to be warming up to 390 DEG C with the heating rate of 10 DEG C/min again, be incubated 230 minutes, cool with stove after insulating process terminates;
Second time tempering: control to be warming up to 170 DEG C with the heating rate of 12 DEG C/min, be incubated 25 minutes; Control to be warming up to 310 DEG C with the heating rate of 18 DEG C/min again, be incubated 22 minutes; Control to be warming up to 410 DEG C with the heating rate of 13 DEG C/min again, be incubated 220 minutes, cool with stove after insulating process terminates;
Third time tempering: control to be warming up to 200 DEG C with the heating rate of 17 DEG C/min, be incubated 20 minutes; Control to be warming up to 300 DEG C with the heating rate of 18 DEG C/min again, be incubated 25 minutes; Control to be warming up to 400 DEG C with the heating rate of 8 DEG C/min again, be incubated 210 minutes, with stove cooling after insulating process terminates, bowl liner plate must be ground.
2. the preparation method of a kind of coal pulverizer mill bowl liner plate according to claim 1, it is characterized in that: the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.45%, Si:0.4%, Mn:0.6%, Cr:5.1%, Mo:1.5%, Cu:1.0%, V:0.4%, Sn:0.045%, Te:0.026%, Ce:0.014%, Zr:0.035%, P:0.016%, S:0.0014%, surplus is Fe and inevitable impurity.
3. the preparation method of a kind of coal pulverizer mill bowl liner plate according to claim 1, it is characterized in that: the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.4%, Si:0.5%, Mn:0.5%, Cr:6%, Mo:1.3%, Cu:1.2%, V:0.3%, Sn:0.05%, Te:0.02%, Ce:0.02%, Zr:0.03%, P:0.02%, S:0.001%, surplus is Fe and inevitable impurity.
4. the preparation method of a kind of coal pulverizer mill bowl liner plate according to claim 1, it is characterized in that: the motlten metal of step 2 is made up of following component and mass percent thereof: C:2.5%, Si:0.3%, Mn:0.8%, Cr:4%, Mo:1.7%, Cu:0.8%, V:0.5%, Sn:0.04%, Te:0.03%, Ce:0.01%, Zr:0.04%, P:0.01%, S:0.002%, surplus is Fe and inevitable impurity.
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| CN105537531A (en) * | 2015-12-27 | 2016-05-04 | 无锡市灵通铸造有限公司 | Aftertreatment method for stainless steel pump valve sand mold |
| CN107323023A (en) * | 2017-06-29 | 2017-11-07 | 扬中市第蝶阀厂有限公司 | A kind of coal bunker composite liner and preparation method thereof |
| CN107245650A (en) * | 2017-06-29 | 2017-10-13 | 扬中市第蝶阀厂有限公司 | A kind of coal bunker liner plate for avoiding coal cinder from being bonded and preparation method thereof |
| CN110093560A (en) * | 2019-04-30 | 2019-08-06 | 徐州天太机械制造有限公司 | A kind of wear-resistant liner and its casting method |
| CN110653343A (en) * | 2019-10-28 | 2020-01-07 | 徐州彭圆锻造有限公司 | Forging method of wear-resistant lining plate |
| CN113235005B (en) * | 2021-05-12 | 2021-12-21 | 江西耐普矿机股份有限公司 | Cast bainite steel for semi-autogenous mill, preparation method thereof and cast bainite steel lining plate for semi-autogenous mill |
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