CN1951606A - High chromium cast iron composite cold roller production process - Google Patents
High chromium cast iron composite cold roller production process Download PDFInfo
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- CN1951606A CN1951606A CN 200610128228 CN200610128228A CN1951606A CN 1951606 A CN1951606 A CN 1951606A CN 200610128228 CN200610128228 CN 200610128228 CN 200610128228 A CN200610128228 A CN 200610128228A CN 1951606 A CN1951606 A CN 1951606A
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Abstract
The invention relates to a high chromium cast iron composite cold roller production. Wherein, said roller comprises roller corn and abrasion resistant layer; the corn is made from low alloy steel or medium carbon steel; the abrasion-resistant layer is made from high chromium white cast iron; the corn and abrasion-resistant layer are induced heated. Its thermal shaping method comprises that putting casting into induction heater, then putting preformed low alloy steel or medium carbon steel roller corn into cast mould; starting the heater to heat it to 1200-1400Deg. C; irrigating high chromium cast iron liquid, heating for 5-15min, stopping, using circulate water to solidify it. The invention can prolong the service life of roller, with low cost.
Description
Technical field
The invention belongs to the roll technology field of the rolling industry of cold-strip steel, what relate generally to is a kind of high chromium cast iron composite cold roller production process.
Background technology
Cold roll is the vitals of cold-rolling mill, is a large amount of crucial wearing pieces that consume in the cold rolled strip steel production.Cold roll is used for the steel cold deformation, and draught pressure, wearing and tearing stress and high alternate stress are far longer than hot roll when belt steel rolling, and require cold-strip steel finished surface quality height.Therefore, the instructions for use of cold roll is very high, and the cold roll core must have good obdurability, and the surface should have high wearability.
At present, the material that is used to produce the cold-strip steel roll mainly contains: rich chromium cast iron, steel alloy, high-speed steel, carbide alloy etc.
Wherein rich chromium cast iron is the wearability of a generally acknowledging roll material preferably, and M is inlaying in its tissue characteristic on martensite, austenitic matrix
7C
3The type carbide, the microhardness height of this carbide (HV1200～1800) is produced cold roll with rich chromium cast iron and can be obtained wearability preferably.But compare with steel alloy, rich chromium cast iron toughness is lower, and whole high-chromium iron-cast roller can not satisfy heavily stressed requirement when cold rolling fully.Steel alloy has good tough cooperation, and a large amount of materials that adopt are 9Cr2Mo on cold roll, and is wear-resistant main by martensitic matrix, relative spoken parts in traditional operas high chromium cast iron material, and wearability is low.High-speed steel toughness is lower than steel alloy, and wearability is higher than rich chromium cast iron.Carbide alloy is that hardness is the highest, the wearability best material, by the carbide and the alloy composition of high rigidity, is used to produce roll and can obtains very high wearability.But carbide alloy can only be made less collars, and the production cost height.This shows that the solid roll of homogenous material preparation can not satisfy cold rolling requirement to obdurability and wearability simultaneously.The composite roll roller core adopts toughness steel alloy preferably, the high chromium cast iron material of outer employing high-wearing feature is the effective way that addresses this problem, skin of the roll has higher wearability, the toughness material of internal layer can guarantee that again roll has high toughness, has application prospect and the high cost performance more wide than integral material roll.
By the production technology branch, composite roll mainly comprises centrifugally cast composite roll, continuous casting (CPC) composite roll, electroslag remelting (ESR) composite roll, combined roll etc.
Centrifugally cast composite roll is to adopt the method for centrifugal casting to produce the bimetallic composite roll.Skin of the roll is that high-wearing feature material, the internal layer of dense structure is spheroidal graphite cast-iron.Because the cold-strip steel roller diameter is little, centrifugal casting internal layer spheroidal graphite cast-iron is very difficult, and spheroidal graphite cast-iron easily forms defectives such as spoken parts in traditional operas, generation shrinkage cavity.Nobody adopts in the world at present.
Continuous casting (CPC) composite roll is that prefabricated profiled composite roll roller core is placed crystallizer, carry out preheating with induction coil pair roller wicking surface, pour into a mould outer sphere molten metal then, roller core is twitched downwards, the skin that has solidified is moved down with roller core, finally become composite roll.The tissue and the grain size of the high-speed steel roller stock that this method is produced are much thinner than centre spinning method, and the distribution of carbide even dispersion, and the life-span, comparable centrifugal casting roll was high by 30%.
Electroslag remelting process is produced composite roll and is similar to the CPC method, and electroslag carries out preheating and cleaning to mandrel.The metal liquid of this method below the stirring electroslag promotes the formation of binder course.But must control reflow process, in order to avoid pollute working lining.The roll of electroslag remelting production also has characteristics such as dense structure, no component segregation, and wearability is better.
The common drawback of CPC method and ESR method is that complex process, productivity ratio are low, cost is high.
Combined roll is that roll is made several parts, combines with mechanical means.The roll internal layer uses toughness material, and outer collars uses carbide alloy.This roll can be saved valuable carbide alloy, and cost performance is than higher.But, can cause the roll unbalance stress in the operation of rolling and chipping because carbide roll ring and internal layer roller core are difficult to accomplish seamless combination.
Summary of the invention
The objective of the invention is to propose a kind of high chromium cast iron composite cold roller production process.Effectively improve the mechanical performance of roll, increase the service life, reduce production costs.Solve centre spinning simultaneously component segregation easily takes place, CPC method and ESR method complex manufacturing, the problem that productivity ratio is low, cost is high.
The present invention realizes that the technical scheme that above-mentioned purpose is taked is: roll comprises roller core and roll wearing layer, roller core adopts low-alloy steel or medium carbon steel to make, the roll wearing layer adopts the high-chromium white cast iron material to make, roller core and roll wearing layer pass through eddy-current heating, its thermoforming process: casting mold is put into induction heating equipment, again prefabricated low-alloy steel or medium carbon steel roller core are put into casting mold, open induction heating equipment heating roller core, when being heated to 1200～1400 ℃, pour into the rich chromium cast iron liquation, continue the small-power heating again and stop heating after 5～15 minutes, finish until solidifying by recirculated water.
High-chromium white cast iron material of the present invention is Cr20 or Cr26 or Cr28.
Casting mold of the present invention is made by refractory material and wire netting.
Main feature of the present invention is:
1. technology is workable, reduces workman's operation easier.
2. even tissue, segregation-free.
3. two kinds of materials are the excellent metallurgical combination, and the bond strength height has very high wearability, simultaneously good toughness are arranged again, can effectively increase the service life.Rich chromium cast iron liquid by after eddy-current heating roller core and the cast has reduced the temperature difference between roller core and the outer sphere molten metal, and making low-alloy steel roller core and rich chromium cast iron liquation is that excellent metallurgical combines, and has the favorable mechanical performance.
3. technology is simple, stable, cost is low, is suitable for producing in batches.
Description of drawings
Fig. 1 is the structural representation of compound founding roll equipment of the present invention.
Among the figure, 1, roller core, 2, the rich chromium cast iron liquation, 3, insulated feeder, 4, the eddy-current heating crystallization apparatus, 5, casting mold, 6, casting mold interior metal net, 7, water inlet pipe, 8, drainpipe, 9, the casting mold base.
Specific embodiments
In conjunction with the accompanying drawings, it is as follows to provide embodiments of the invention:
Embodiment 1
The described roll of the implementation case comprises roller core and roll wearing layer, and roller core adopts toughness prefabricated the forming of low-alloy steel material (ZG35CrMo) preferably; The roll wearing layer adopts high-chromium white cast iron material C r20 to make,
The equipment (as shown in Figure 1) that present embodiment adopts.The casting mold 5 of this equipment is made by refractory material and wire netting 6, and wire netting 6 is embedded in the refractory material casting mold 5, and the base 9 of casting mold is equipped with cooling water inlet pipe 6 and drainpipe 7.
The concrete thermoforming process of present embodiment is: casting mold 5 put into eddy-current heating crystallization apparatus 4, more prefabricated low-alloy steel roller core 1 put into casting mold, open induction heating apparatus heating roller core 1, and to be heated during to 1200 ℃, pour into the rich chromium cast iron liquation; Reduce induction heating power and continue 15 minutes (avoiding defectives such as pore, shrinkage cavity) of heating,, finish, cool off with stove until solidifying by water inlet pipe 7 and the circulation of drainpipe 8 cooling waters.Promptly get high chromium cast iron composite cold roller.
Embodiment 2
The described roll of the implementation case comprises roller core and roll wearing layer, and roller core adopts toughness prefabricated the forming of low-alloy steel material (ZG40Cr) preferably; The roll wearing layer adopts high-chromium white cast iron material C r26 to make,
The equipment that present embodiment adopts is with embodiment 1.Its concrete thermoforming process is: casting mold 5 put into eddy-current heating crystallization apparatus 4, more prefabricated low-alloy steel (ZG40Cr) roller core 1 put into casting mold, open induction heating apparatus heating roller core 1, and to be heated during to 1200 ℃, pour into the rich chromium cast iron liquation; Reduce induction heating power and continue 10 minutes (avoiding defectives such as pore, shrinkage cavity) of heating,, finish, cool off with stove until solidifying by water inlet pipe 7 and the circulation of drainpipe 8 cooling waters.Promptly get high chromium cast iron composite cold roller.
Embodiment 3
The described roll of the implementation case comprises roller core and roll wearing layer, and roller core adopts toughness prefabricated the forming of low-alloy steel material (ZG40Cr) preferably; The roll wearing layer adopts Cr28, and this wearing layer main component is (%):
The equipment that present embodiment adopts is with embodiment 1.Its concrete thermoforming process is: casting mold is put into eddy-current heating crystallization apparatus 4, more prefabricated low-alloy steel (ZG40Cr) roller core 1 is put into casting mold, open induction
Heater heating roller core 1, to be heated during to 1250 ℃, pour into the rich chromium cast iron liquation; Reduce eddy-current heating
Power continues 5 minutes (avoiding defectives such as pore, shrinkage cavity) of heating, by water inlet pipe 7 and the circulation of drainpipe 8 cooling waters, finishes until solidifying, and cools off with stove.Promptly get high chromium cast iron composite cold roller.
Claims (4)
1, a kind of high chromium cast iron composite cold roller, comprise roller core and roll wearing layer, roller core adopts low-alloy steel or medium carbon steel to make, the roll wearing layer adopts high chromium cast iron material, it is characterized in that: casting mold is put into induction heating equipment, again prefabricated low-alloy steel or medium carbon steel roller core are put into casting mold, open induction heating equipment heating roller core, when being heated to 1200～1400 ℃, pour into the rich chromium cast iron liquation, continue the small-power heating again and stop heating after 5～15 minutes, finish until solidifying by recirculated water.
2, the production technology of high chromium cast iron composite cold roller according to claim 1 is characterized in that: described roller core and rich chromium cast iron wearing layer are to form metallurgical binding by induction heating equipment.
3, the production technology of high chromium cast iron composite cold roller according to claim 1 is characterized in that the casting mold (5) in the described induction heating equipment is made by refractory material and wire netting (6).
4, the production technology of rich chromium cast iron composite roll according to claim 1 is characterized in that: the high chromium cast iron material that described roll wearing layer adopts is Cr20 or Cr26 or Cr28.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610128228 CN1951606A (en) | 2006-11-17 | 2006-11-17 | High chromium cast iron composite cold roller production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610128228 CN1951606A (en) | 2006-11-17 | 2006-11-17 | High chromium cast iron composite cold roller production process |
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| Publication Number | Publication Date |
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| CN1951606A true CN1951606A (en) | 2007-04-25 |
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| CN 200610128228 Pending CN1951606A (en) | 2006-11-17 | 2006-11-17 | High chromium cast iron composite cold roller production process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873307A (en) * | 2012-09-25 | 2013-01-16 | 马鞍山市晨光高耐磨科技发展有限公司 | Method for remelting roller surface of crush roller and casting abrasion-resistant alloy layer |
| CN104308125A (en) * | 2014-10-16 | 2015-01-28 | 张福阳 | Electric induction heating casting method capable of improving abrasion resistance of casting piece |
| CN104550714A (en) * | 2015-01-22 | 2015-04-29 | 江苏理工学院 | Processing mold of cast iron and steel composite material and manufacturing process of processing mold |
-
2006
- 2006-11-17 CN CN 200610128228 patent/CN1951606A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873307A (en) * | 2012-09-25 | 2013-01-16 | 马鞍山市晨光高耐磨科技发展有限公司 | Method for remelting roller surface of crush roller and casting abrasion-resistant alloy layer |
| CN102873307B (en) * | 2012-09-25 | 2015-07-01 | 马鞍山市晨光高耐磨科技发展有限公司 | Method for remelting roller surface of crush roller and casting abrasion-resistant alloy layer |
| CN104308125A (en) * | 2014-10-16 | 2015-01-28 | 张福阳 | Electric induction heating casting method capable of improving abrasion resistance of casting piece |
| CN104550714A (en) * | 2015-01-22 | 2015-04-29 | 江苏理工学院 | Processing mold of cast iron and steel composite material and manufacturing process of processing mold |
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