CN1076393A - A kind of manufacture method of steel-cored cast-iron compound roll - Google Patents
A kind of manufacture method of steel-cored cast-iron compound roll Download PDFInfo
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- CN1076393A CN1076393A CN 92113960 CN92113960A CN1076393A CN 1076393 A CN1076393 A CN 1076393A CN 92113960 CN92113960 CN 92113960 CN 92113960 A CN92113960 A CN 92113960A CN 1076393 A CN1076393 A CN 1076393A
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Abstract
The present invention relates to a kind of manufacture method of steel-cored cast-iron compound roll, adopt traditional sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, steel core is processed into curved surface shaped, and at steel core surface coating one deck fusible metal layer, steel core combines with the cast iron housing curved surface, and is fastening compound by the molten steel solidification shrinkage stress.Owing to coat one deck fusible metal on the steel core top layer, setting temperature is reduced, setting time prolongs, balance the shrinkage stress that produces of molten steel solidification, solved effectively and adopted traditional casting process at the steel core surface compounded cast iron of casting, the technical barrier that shell easily splits, steel core combines with the cast iron housing curved surface, frictional force is big, and is incrust.
Description
The present invention relates to the manufacture method of rolling mill roll,, be applicable to the roll of making all kinds of milling trains particularly about a kind of manufacture method of steel-cored cast-iron compound roll.
With steel rolling production at a high speed, depress greatly, the high accuracy direction develops, the core intensity of breaker roll and the requirement of surface abrasion resistance are strict day by day, existing steel roll, alloy iron roll and shell are that alloy cast iron, core are the roll of spheroidal graphite cast-iron, can not satisfy the growing demand of steel rolling production technology.At present, the development work of steel-cored cast-iron compound roll has caused roller author's concern.People attempt to adopt existing casting technique and equipment, make steel-cored cast-iron compound roll.But the molten steel solidification shrinkage stress causes cast iron housing the technical barrier that crackle is difficult for manufacturing to occur and is not resolved as yet.At present, develop a kind of steel-cored cast-iron compound roll that adopts steel core and cast iron housing interference assembling, because steel core surface and cast iron housing inner surface machining accuracy difference are big, during both interference assemblings, be difficult to closely compoundly, under the roll-force effect, cast iron housing is prone to crackle and peeling off.A kind of manufacture method (Fig. 1) of steel core alloy cast iron composite roll was disclosed in the U.S. on the 15th Pat3455372 literary composition July in 1969, it adopts continuous cast method, insertion had in the mold of high frequency induction heater, crystallizer after steel core adopted high frequency induction heater to preheat, at steel core surface casting compounded cast iron shell.Steel core and cast iron housing close with metallurgical bond, and one deck metallurgical binding transition zone is arranged between the two, the steel-cored cast-iron compound roll that adopts this method to make, steel core combines with cast iron housing firmly, the core good toughness, surface abrasion resistance is good, but has problems such as manufacturing process and equipment complexity.
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art part, provide a kind of steel core and cast iron housing in conjunction with firmly, the manufacture method of manufacturing process and the simple steel-cored cast-iron compound roll of equipment, it can solve effectively adopts existing casting technique to make steel-cored cast-iron compound roll, the technical barrier that cast iron housing easily splits and peels off, and it is compound tight to overcome interference assembling steel-cored cast-iron compound roll effectively, the defective that easily cracks and peel off during use.
Purpose of the present invention can reach by following measure:
The present invention is a kind of manufacture method (Fig. 2) of steel-cored cast-iron compound roll, adopt sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, roll is made up of steel core and cast iron housing two parts, steel core surface is through Passivation Treatment, low-temperature heat, then through operations such as casting molten iron, insulation, heat treatments; It is characterized in that: after 1. steel core surface being processed into curved surface shaped (or multiaspect shape) and carrying out Passivation Treatment, coat one deck fusible metal layer on its top layer, its thickness is determined by cast iron housing molten steel solidification amount of contraction and steel core thermal expansion amount, 2. steel core combines with the cast iron housing curved surface, the cast iron housing endosexine forms one deck metallurgical binding transition zone, and is fastening compound by the molten steel solidification shrinkage stress.
Purpose of the present invention can also reach by following measure.
The main casting technological parameter of steel-cored cast-iron compound roll of the present invention is as follows:
1, steel core low-temperature heat to 300 ℃ ± 10 ℃; Steel core temperature when 2, pouring into a mould＞200 ℃; 3, molten steel pouring temperature is 1270 ℃～1300 ℃; 4, poring rate 200～220kg/s; 5, the molten iron rate of climb 80～85mm/s; 6, watered the rear enclosed temperature retention time 80 hours, the casting temperature of unpacking＜120 ℃.
Purpose of the present invention can also reach by following measure:
The heat treatment cycle curve of steel-cored cast-iron compound roll of the present invention is seen Fig. 3.
Steel-cored cast-iron compound roll foundry goods of the present invention rises to 350 ℃ with≤20 ℃/h programming rate, is incubated 6 hours, rises to 550 ℃ ± 10 ℃ with≤20 ℃/h programming rate again, is incubated after 32 hours, reduces to 120 ℃ with the cooling velocity of≤20 ℃/h and comes out of the stove.
Because the present invention coats one deck fusible metal layer (aluminium metal sheet) in steel core surface, when iron liquid and steel core carry out thermal balance, fusible metal dissolves in molten iron, generate Al-Fe solid solution and Al-Fe eutectic, reduced setting temperature, prolonged setting time, balance the shrinkage stress that produces of molten steel solidification, at iron liquid solidification shrinkage and the fastening compound tense of steel core, be difficult for cracking, solved effectively and adopted traditional casting process, the technical barrier that easily splits and peel off at steel core surface compounded cast iron layer, the surface of steel core of the present invention is curved surface shaped (or multiaspect shape), and steel core is the curved surface combination with combining of cast iron housing, under the roll-force effect, both composite surface frictional force is big, incrust, the steel-cored cast-iron compound roll that has overcome existing interference assembling effectively under the roll-force effect, the flaky defective of cast iron housing.The present invention adopts traditional sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, and manufacture technology and equipment are simple.
The drawing of accompanying drawing of the present invention is described as follows:
Fig. 1 prior art steel-cored cast-iron compound roll manufacture method schematic diagram;
1-steel core among the figure, 2-high-frequency induction pre-heater, 3-flux, 4-depositing funnel, 5-high frequency induction heater, 6-high-frequency inductor, 7-buffer, 8-water cooler, 9-water inlet, 10-cast iron layer, 11-delivery port, 12-cast iron water.
Fig. 2 is a steel-cored cast-iron compound roll manufacture method schematic diagram of the present invention.
13-under casing among the figure, 14-roll cast iron housing, 15-running channel, 16-rising head case, 17-electrode, 18-adjusting device, the 19-metal trough that overflows, 20-fusible metal layer, 21-steel core, 22-cold mould.
Fig. 3 is the heat treatment cycle curve of steel-cored cast-iron compound roll of the present invention.
The invention will be further described below in conjunction with drawings and Examples.
Manufacturing the four-high medium plate mill work roll with the present invention is example:
Body of roll specification: φ 780 * 2500mm, total length: 5764mm.The steel core material adopts 45# steel, cast iron housing to adopt alloy cast iron, the about φ 450mm of steel core diameter, cast iron housing bed thickness 165mm, the molten iron composition is: C2.9～3.4%Si0.9～1.2%, Mn0.4～0.7%, P≤0.15%, S≤0.1%, Cr0.9～1.2%, Mo0.4～0.6%, Ni3.6～4.5%, 1350 ℃ of molten iron tapping temperatures, steel core coat the thick aluminium sheet of one deck 6mm outward, adopt sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, 300 ℃ of steel core heating-up temperatures, poring rate 35～40 seconds.The molten iron rate of climb 80～85mm/s; Body of roll top molten iron covers with heat preserving agent, energising heating 15～20 minutes, after watering with casting mold sealing insulation 80 hours, temperature≤120 ℃ when casting mold is unpacked.Through stress-relieving by beat treatment.Through check flawless, no casting flaw.It is stratiform that steel-cored cast-iron compound roll cast iron housing internal layer metallurgical binding transition zone has Al-Fe solid solution and Al-Fe eutectic, graphite form, and metallographic structure is martensite+carbide+iron phosphide eutectic-carbide.
The roll that adopts steel-cored cast-iron compound roll manufacture method of the present invention to manufacture, core intensity height, surface abrasion resistance is good, bearing load is big, and fatigue performance is good, through using proof, roll breakage, top layer crackle and peeling phenomenon do not occur, improved the service life of roll effectively
The present invention compared with prior art has the following advantages:
1, production technology and equipment are simple;
2, steel core and the combination of cast iron housing curved surface, in conjunction with firm, under the roll-force effect, frictional force is big, and cast iron housing is incrust;
3, at steel core outer cladding fusible metal layer, cushioning balance the shrinkage stress that produces of molten steel solidification, the foundry goods flawless;
4, the roll service life improves.
Claims (3)
1, a kind of manufacture method of steel-cored cast-iron compound roll, adopt sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, roll is made up of steel core and cast iron housing two parts, and steel core surface is through Passivation Treatment, low-temperature heat, then through operations such as casting molten iron, insulation, heat treatments; It is characterized in that:
1. steel core surface is processed into curved surface shaped (or multiaspect shape), carry out Passivation Treatment after, coat one deck fusible metal layer on its surface, its thickness is determined by cast iron housing molten steel solidification amount of contraction and steel core thermal expansion amount;
2. steel core combines with the cast iron housing curved surface, and the cast iron housing endosexine forms one deck metallurgical binding transition zone, and is fastening compound by the molten steel solidification shrinkage stress.
2, steel-cored cast-iron compound roll manufacture method according to claim 1 is characterized in that the casting technique major parameter is:
1. steel core low-temperature heat to 300 ℃ ± 10 ℃;
Steel core temperature 〉=200 ℃ when 2. pouring into a mould;
3. molten steel pouring temperature is 1270 ℃～1300 ℃;
4. poring rate 200～220kg/s;
5. the molten iron rate of climb 80～85mm/s;
6. watered the rear enclosed temperature retention time 80 hours, the casting temperature of unpacking≤120 ℃.
3, the manufacture method according to claim 1,2 described steel-cored cast-iron compound rolls is characterized in that Technology for Heating Processing is:
The steel-cored cast-iron compound roll foundry goods rises to 350 ℃ with≤20 ℃/h programming rate, is incubated 6 hours, rises to 550 ℃ ± 10 ℃ with≤20 ℃/h programming rate again, is incubated after 32 hours, reduces to 120 ℃ with≤20 ℃/h cooling velocity and comes out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113960 CN1026393C (en) | 1992-12-22 | 1992-12-22 | Method for making steel-cored cast-iron compound roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113960 CN1026393C (en) | 1992-12-22 | 1992-12-22 | Method for making steel-cored cast-iron compound roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1076393A true CN1076393A (en) | 1993-09-22 |
| CN1026393C CN1026393C (en) | 1994-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92113960 Expired - Fee Related CN1026393C (en) | 1992-12-22 | 1992-12-22 | Method for making steel-cored cast-iron compound roll |
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| Country | Link |
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| CN (1) | CN1026393C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102469C (en) * | 2000-08-11 | 2003-03-05 | 钢铁研究总院 | Continuous casting equipment and method for composite roller |
| CN1301815C (en) * | 2005-06-01 | 2007-02-28 | 东北大学 | Electromagnetic continuous casting method of composite roller and its casting equipment |
| CN102389963A (en) * | 2011-11-17 | 2012-03-28 | 铜陵市大成轧辊有限责任公司 | Production method of superstrong wear-resistant centrifugal composite roll |
| CN105436474A (en) * | 2015-11-12 | 2016-03-30 | 丹阳恒庆复合材料科技有限公司 | Manufacturing technique and device for improved bainite nodular cast iron composite roller provided with forged steel roller neck |
| CN109127734A (en) * | 2018-09-06 | 2019-01-04 | 湖南三泰新材料股份有限公司 | Roll sleeve, the manufacturing method of roll sleeve and roll |
| CN112008063A (en) * | 2020-08-11 | 2020-12-01 | 湖南三泰新材料股份有限公司 | Preparation method and preparation device of composite blank |
| CN112170793A (en) * | 2019-07-03 | 2021-01-05 | 宝山钢铁股份有限公司 | Manufacturing method of metal composite long material and metal composite long material |
-
1992
- 1992-12-22 CN CN 92113960 patent/CN1026393C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102469C (en) * | 2000-08-11 | 2003-03-05 | 钢铁研究总院 | Continuous casting equipment and method for composite roller |
| CN1301815C (en) * | 2005-06-01 | 2007-02-28 | 东北大学 | Electromagnetic continuous casting method of composite roller and its casting equipment |
| CN102389963A (en) * | 2011-11-17 | 2012-03-28 | 铜陵市大成轧辊有限责任公司 | Production method of superstrong wear-resistant centrifugal composite roll |
| CN105436474A (en) * | 2015-11-12 | 2016-03-30 | 丹阳恒庆复合材料科技有限公司 | Manufacturing technique and device for improved bainite nodular cast iron composite roller provided with forged steel roller neck |
| CN109127734A (en) * | 2018-09-06 | 2019-01-04 | 湖南三泰新材料股份有限公司 | Roll sleeve, the manufacturing method of roll sleeve and roll |
| CN109127734B (en) * | 2018-09-06 | 2020-05-22 | 湖南三泰新材料股份有限公司 | Roll sleeve, method for producing roll sleeve, and roll |
| CN112170793A (en) * | 2019-07-03 | 2021-01-05 | 宝山钢铁股份有限公司 | Manufacturing method of metal composite long material and metal composite long material |
| CN112008063A (en) * | 2020-08-11 | 2020-12-01 | 湖南三泰新材料股份有限公司 | Preparation method and preparation device of composite blank |
| CN112008063B (en) * | 2020-08-11 | 2022-02-22 | 湖南三泰新材料股份有限公司 | Preparation method and preparation device of composite blank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1026393C (en) | 1994-11-02 |
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