CN104002203B - A kind of thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method - Google Patents
A kind of thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method Download PDFInfo
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- CN104002203B CN104002203B CN201410239664.3A CN201410239664A CN104002203B CN 104002203 B CN104002203 B CN 104002203B CN 201410239664 A CN201410239664 A CN 201410239664A CN 104002203 B CN104002203 B CN 104002203B
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- bombardment
- continuous casting
- texturing
- powder
- thin band
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
Abstract
A kind of thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method, by scaling type nozzle, accelerates granule stream with high-pressure gas flow and forms gas-solid two-phase flow, and bombardment forms the random pattern being made up of bombardment hole overlay structure to crystal roller surface repeatedly.Compared with tradition texturing technique, it is good that the crystal roller surface pattern random distribution through the technology of the present invention frosting treatment adds up uniformity；Texturing surface roughness is high, and controlled range that surface topography parameters is adjustable is big, and peak density (RPc value) is reasonable, and efficiency is high, low cost, and the defect such as texturing surface impulse-free robustness, flange, and, its equipment configuration realizing industrialization is simple, it is easy to accomplish, manufacturability is good.
Description
Technical field
The present invention relates to strip continuous casting technology field, particularly relate to a kind of thin band continuous casting crystallization roller adjustable
Controlled high roughness texturing surface preparation method.
Background technology
Crystalline roll used for thin belt continuous casting surface directly contacts with molten steel, during its surface topography is used for
Interface heat transfer and solidification of molten steel process have a major impact, directly affect thin band continuous casting technique and band steel
Amount, therefore, in actual production, needs to prepare adjustable roughness value, reasonable peak density value and micro-
See the isoparametric surface topography of unevenness, and other are miscellaneous to need to prepare surface cleaning non-oxidation iron sheet etc.
Matter.Therefore crystallization roll texturing technology is one of key technology of thin strap continuous casting complete set technology.
Owing to crystal roller surface is usually the higher copper alloy matrix of hardness, nickel alloy coating surface or chromium
Coating surface, traditional shot-peening, that sandblast texturing method prepares the little adjustable extent of roughness is little, and
Using nozzle poor to pill or grains of sand acceleration, bombarding energy is low, and surface exists oxide skin or embedding
Emergy etc..Strip quality can be adversely affected in crystallization roll uses by these defects, needs
Take measures to eliminate.
Conventional roughing method has SBT (shot-peening texturing), EDT (electric spark texturing), EBT (electricity
Sub-Shu Maohua), LT (laser roughening) and TOPOCROM method etc..These methods are respectively arranged with quality,
It is used for roller surface manufacture at present.
Research to crystal roller surface texturing technology both at home and abroad relates to multinomial patent, mainly includes laser capillary
Change method, machinery roughing method and electric spark roughing method etc., these methods are summed up, and can be divided into
There is relatively strong regular surface topography, such as machinery texturing (prepared by texture) method, laser texturing method
Deng；Random distribution surface topography, such as shot-peening texturing, sandblast texturing etc.；And the above two combine
Complex method etc..Additionally, the application that TOPOCROM method is on crystallization roll is still in exploration rank
Section, the most immature.
NUCOR house journal of the U.S. (US2009/0145567A1) discloses a kind of employing Buddha's warrior attendant
Stone carving lithography prepares the method on crystallization roll texturing surface, i.e. uses diamond engraving, laser and etching
Etc. the array structure being alternatively formed by gravure, projection of technology formation rule, per inch about 75-250
OK, the bossing area formed is between 40-40000 μm2, or 14000-20000 μm2, or
900-3600μm2, and array direction and crystallization roll axis direction inclination angle are between 5 °-45 °.
United States Patent (USP) 5701948 discloses the surface topography of a kind of crystallization roll, at double-roller continuous casting machine
On, by having circumferentially extending groove and the ridge structure of certain depth and spacing so that crystallization
Roller surface-texturing.During this reticulate structure after surface texturing can improve metal freezing
Heat flux, so that thin strap continuous casting optimization, obtains the microcosmic of densification while i.e. reaching high heat-flux
Structure.The concrete appearance and size that optimizes includes that the ridge peak reticulate pattern degree of depth to groove root is between 15 μm-25 μm
Between, reticulate pattern spacing is in 150 μm-200 μ m.It should be noted that disclosed in this patent
Although crystallization roll pattern can reach high setting rate when cast ferrous metal, but it is to technique
Condition is very sensitive, it is necessary to be strictly controlled by, and otherwise, can produce " crocodile skin " and " oscillation mark " two kinds
Cast Strip defect.
United States Patent (USP) US6942013 discloses a kind of crystal roller surface random grain structure, uses oxidation
The material blasting treatments such as aluminum, silicon oxide and carborundum, particle diameter is between 0.7mm-1.4mm.
The open method using laser roughening of European patent EP 0577833A1 carries out the surface of crystallization roll
Pattern processes, and the degree of depth in the bombardment hole formed is more than 50 μm, and diameter, below 500 μm, bangs
Hit the spacing between hole and be about 1.05-5 times of bombardment hole diameter；European patent EP 1281458A1
Disclosed bombardment hole shape characteristic is that hole is deep in 40-200 μm, diameter in 500-3000 μm, hair simultaneously
Changing the pit that on surface, also nesting person is more tiny, the degree of depth is in 1-50 μm, and diameter is about 5-200 μm.
China Patent Publication No. CN1311721A discloses steel band continuous cast method, it is indicated that molten steel quilt
It is directed among the roll gap between parallel casting roll, is formed and be supported on the molten bath on roller casting surface, crystallization roll
Rotate and guide downwards solidified steel strip from roll gap, its casting surface mentioned i.e. process of crystal roller surface
Use sandblasting on base material (Ra is between 5-10), then plate 50 μm chromium as wearing layer,
Or directly carry out sandblasting at nickel protection coating surface.
Korean Patent KR2006074635 discloses Strip sheet casting casting roll, and it is made by bead
Crystal roller surface produces tiny indenture, thus the uniformly surface preparation method of quick solidification molten steel.
Patent WO2008/016231A1 of Posco application discloses a kind of employing photoetching method at crystallization roll
Gas passage is prepared on surface, thus avoids gas expansion to cause the crystallization roll table of strip surface pitting defects
Face processing method.
Additionally, Posco also applies the method for laser roughening to prepare crystal roller surface pattern, but, this
Economy and the exploitativeness of the method for kind all can not reach thin strap continuous casting industrialization demand.
According to different cast materials and casting process, crystal roller surface structural parameters needs large range of
Adjust, but, conventional shot-peening can not prepare high roughness and the surface topography of peak value density, and
The roll surface of the technical finesses such as electric spark texturing and laser texturing method has again stronger regularity, uncomfortable
It is suitable for thin band continuous casting technique to produce.
Summary of the invention
It is an object of the invention to provide a kind of adjustable controlled high roughness texturing of thin band continuous casting crystallization roller
Surface preparation method, meets thin band continuous casting technique requirement, improves crystal roller surface solidification and heat-transfer effect,
And then raising strip surface quality.It is characterized in that the crystal roller surface pattern through frosting treatment divides at random
Cloth statistics uniformity is good；Texturing surface roughness is high, and controlled range that surface topography parameters is adjustable is big, effect
Rate is high, low cost, the defect such as texturing surface impulse-free robustness, flange, and, its industrialization equipment configuration
Simply, it is easy to accomplish, manufacturability is good.
For reaching above-mentioned purpose, the present invention's is that technical scheme is:
A kind of thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method, it uses contracting
Put type nozzle, and lead to main gas and the powder particle stream accelerated by powder feeding carrier gas respectively, form gas-solid double
Xiang Liu, bombardment is to crystal roller surface repeatedly, forms the random pattern being made up of bombardment hole overlay structure,
Finally to crystal roller surface grinding and polishing, it is thus achieved that crystal roller surface texturing surface topography: Ra is
1μm-25μm；Rz is 3-300 μm, and RPc is 5-50/cm；
Wherein, powder particle bombardment technological parameter is: Rz, Ra=f (P, T), P: main gas pressure
Power, T: gas temperature；Wherein: Rz=K0+K1*P+K2*T-K3*P*P-K4*T*T+K5*P*T；
K0:40-50；K1:20-30；K2:0-1；K3:3-4；K4:0-1；K5:0-1；
Ra=Rz/k, k=4～6；
Main gas pressure is 0.2～3.5MPa, gas flow 10～100Nm3/h；Gas temperature is
Room temperature～400 DEG C；Described particle diameters is 1～1000 μm.
Further, described powder particle is rustless steel steel wire cut pill, pottery or hard alloy, and it is hard
Degree is HRC30～HRC65.
Preferably, described nozzle is scaling type nozzle, and it includes contraction section, throat, expansion successively
Section；Throat diameter 2.5～3.8mm, expansion segment length 30～300mm, expansion segment outlet diameter
5～20mm.
Nozzle of the present invention is different from the straight tube nozzle of shot-peening and sandblasting, for scaling type nozzle, acceleration
Can good, can by the Particle Acceleration of 1 μm～1000 μm to more than 250m/s, and conventional spout for
The acceleration effect of major diameter granule can only achieve below 100m/s.
Also, described powder particle uses powder feeder conveying, powder feeder powder feeding pipe internal diameter is 2.5～10.0mm；
Because spherical particle diameters scope is big, powder feeding pipe internal diameter 2.5～10.0mm, otherwise powder particle is prone to
Blocking, thus cause processing to lose efficacy；Powder particle nebulizer gas pressure is atmospheric pressure～3.5MPa；Powder feeding carries
Throughput 0～35Nm3/h。
Described powder particle uses the online powder feeding of multichannel, it is possible to achieve changes powder online, greatly improves life
Produce efficiency.
It addition, grinding of the present invention and finishing method, initially with the carborundums of 180～No. 600 or
The thick polishing processing of diamond abrasive band, the carborundum or the diamond abrasive band essence that re-use 320～No. 1200 are thrown
Light, is finally completely eliminated the defects such as the bombardment burr of pit edge, flange.
The present invention uses the method that high speed particle bombards, and accelerates firmly with gases at high pressure in scaling type nozzle
Matter spheroidal particle, and bombard to crystal roller surface, cause crystal roller surface self to produce plastic deformation,
Thus form random pattern.
The present invention is random pattern characterization parameter with Ra, Rz, RPc, and wherein, Ra with Rz is all strong
It is associated but there is unique symbolical meanings.Comparison analysis and a large amount of examination through three-dimensional appearance
Testing observation statistics, the randomness on the present invention obtained texturing surface by force, can use the roughmeter can
The parameter measured is estimated by mass data statistical method, and the assessment method of other dimension can be grasped
The property made is poor, and data value fluctuation is big, statistically little with referring to property.Involved by therefore, in the present invention
Characterizing method is the most practical, can meet crystallization roll industrialization demand.
Present invention process parameter is easily controllable, can calculate partickle bombardment speed according to the gas-solid bidirectional flow of nozzle
Degree, is used for the bombardment speed of acquisition collision calculation, and can obtain the bombardment hole degree of depth, then calculate table
Face topographical information, thus surface appearance feature parameter can have been contacted with high speed particle bombardment technological parameter
Come, thus realize the adjustable, controlled and measurable of texturing pattern: Rz, Ra=f (P, T)；P:
Gas pressure, T: gas temperature.
The present invention uses powder particle, and along with the increase of particle diameters, that can prepare is maximum thick
Rugosity increases the most accordingly, and RPc value then declines.Powder used be spherical stainless steel steel wire cut pill or
The materials such as pottery, hard alloy, pellet diameters should between 100～1000 μm, hardness between
Between HRC30～HRC65.
The present invention is compared with other invention, and its difference and novelty are as follows:
Tradition crystallization roll roll surface frosting treatment obtained surface topography peak density numerical value is relatively low, adjusts model
Enclosing little, uniformity is poor, it is impossible to meet crystallization roll solidification and heat transfer needs.
And the present invention uses high speed particle bombardment method to carry out surface texturing process, have and additive method
Different feature, the gas pressure of employing is big, temperature is high (compared with conventional shot-peening) and
De-Laval nozzle, bombardment particle speed is fast, bombard intensity and energy is big.
First, owing to bombarding granule direction and bombardment position random distribution in beam spot diameter, so that microcell
Pattern has randomness；
Second, owing to using saturated bombardment technology, therefore, the macro morphology feature of crystal roller surface is same
Time there is randomness and statistics uniformity (the structural parameters value only ripple in less scope such as roughness
Dynamic).In this manner it is possible to avoid the adverse effect that pattern regularity is brought；
3rd, owing to bombarding beam spot diameter has with the distance of crystallization roll with nebulizer gas pressure, temperature, spray gun
Close, therefore, change bombardment technique, thus it is possible to vary bombard the granule distribution character at crystal roller surface,
Thus obtain the particular surface meeting heat transfer solidification demand；
Finally, the high speed particle bombardment roughing method low cost of present invention exploitation, exploitativeness is good.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of crystal roller surface texturing system of the present invention.
Fig. 2 be Ra be close to adjust lower limit time crystal roller surface pattern photo；
Fig. 3 be Ra be close to adjust intermediate value time crystal roller surface pattern photo；
Fig. 4 be Ra be close to adjust higher limit time crystal roller surface pattern photo；
Fig. 5 is to have bombarded later crystallization roll texturing surface sections pattern photo；
Fig. 6 is grinding, has polished later texturing surface sections pattern photo；
Fig. 7 is grinding, has polished later crystallization roll texturing surface topography photo.
Detailed description of the invention
The thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method of the present invention, it is adopted
Use scaling type nozzle, and lead to main gas and the powder particle stream accelerated by powder feeding carrier gas respectively, form gas
Gu two-phase flow, bombardment is to crystal roller surface repeatedly, forms the random shape being made up of bombardment hole overlay structure
Looks, finally to crystal roller surface grinding and polishing, it is thus achieved that crystal roller surface texturing surface topography: Ra
It is 1～25 μm；Rz is 3～300 μm.
The master in source 2 as it is shown in figure 1, the scaling type nozzle 1 of corresponding crystallization roll 100 is ventilated the most in succession
Gas pipeline 3 and the powder particle conveyance conduit 4 accelerated by powder feeding carrier gas, main gas pipe 3 and powder
On the granule conveyance conduit 4 of end, electromagnetic valve 5,6 is set；On main gas pipe 2, also parallel connection sets a road band gas
The pipeline 21 of body heater 7 and hand-operated valve 8, main gas pipe 2 also sets hand-operated valve 8 '；Powder
Powder feeder 9 is set on granule conveyance conduit 4.
The present invention is with Ra, Rz, and RPc is random pattern characterization parameter, and wherein, Ra with Rz is strong phase
Associate but there is unique symbolical meanings.Comparison analysis and lot of experiments through three-dimensional appearance
Observing statistics, the randomness on the technology of the present invention obtained texturing surface is strong, can use roughmeter energy
Enough parameters measured are estimated by mass data statistical method, and the assessment method of other dimension can
Operability is poor, and data value fluctuation is big, statistically little with referring to property.Therefore, involved in the present invention
Characterizing method the most practical, crystallization roll industrialization demand can be met.
Present invention process parameter is easily controllable, can calculate partickle bombardment speed according to the gas-solid bidirectional flow of nozzle
Degree, is used for the bombardment speed of acquisition collision calculation, and can obtain the bombardment hole degree of depth, then calculate table
Face topographical information, thus surface appearance feature parameter can have been contacted with high speed particle bombardment technological parameter
Come, thus realize the adjustable, controlled and measurable of texturing pattern: Rz, Ra=f (P, T)；P:
Gas pressure, T: gas temperature.As shown in Figure 2 to 4.
The present invention uses powder, along with the increase of diameier, the maximal roughness that can prepare also phase
Should increase, RPc value then declines.Powder used is spherical stainless steel steel wire cut pill or pottery, hard
The materials such as matter alloy, pellet diameters is between 100～1000 μm, and hardness is between HRC30～HRC65
Between.
The nozzle that the present invention uses is different from the straight tube nozzle of shot-peening and sandblasting, for scaling type nozzle,
Nozzle acceleration is good, by the Particle Acceleration of 1 μm～1000 μm to more than 250m/s, and can pass
System nozzle can only achieve below 100m/s for the acceleration effect of major diameter granule；Jet size parameter
In, expansion segment length 30～300mm, throat diameter 2.5～3.8mm, outlet diameter 5～20mm.
Present invention employs new type multipath dust feeder.Because spherical particle diameters scope is big, powder feeding pipe
Internal diameter 2.5～10.0mm, otherwise powder particle is prone in blocking, thus causes processing to lose efficacy；Additionally,
Multichannel powder feeding mechanism can be implemented in line and changes powder, greatly improves production efficiency,
The grinding-polishing that the present invention uses, initially with carborundum or the diamond abrasive band of 180～No. 600
Carry out grinding and polishing, re-use carborundum or the diamond abrasive band finishing polish of 320～No. 1200, may finally
The defects such as the bombardment burr of pit edge, flange is completely eliminated.As shown in Fig. 5～Fig. 7.
Embodiment 1
Bombardment microgranule is rustless steel steel wire cut pill, spherical, particle diameter 400 μm, and driving gas is nitrogen,
Pressure 1.5MPa, temperature 400 DEG C, nozzle divergence segment length 150mm, throat diameter 3.5mm,
Outlet diameter 8.5mm；Powder feeding nebulizer gas pressure is 1.5MPa, flow 7Nm3/h；1 tunnel powder feeding；Adopt
With No. 180 SiC sbrasive belt grindings, No. 1200 diamond abrasive band polishings, the random structural parameters of final acquisition
Average: Ra is 17 μm, and Rz is 107 μm, and RPC is 35/cm, and microscopic analysis shows limit, bombardment hole
Edge is smooth, the defect such as impulse-free robustness, flange and foreign body embedding.
Embodiment 2
Bombardment granule is α-Al2O3, spherical, medium particle diameter 350 μm, driving gas is nitrogen, pressure
2.0MPa, temperature 150 DEG C, nozzle divergence segment length 110mm, throat diameter 3.0mm, outlet is straight
Footpath 7.5mm；Powder feeding nebulizer gas pressure is 2.0MPa, flow 9Nm3/h；1 tunnel powder feeding；Use 320
Number SiC sbrasive belt grinding, No. 1200 diamond abrasive bands polishings, final obtain random pattern mean parameters:
Ra is 15 μm, and Rz is 91 μm, and RPC is 38/cm, and it is smooth that microscopic analysis shows to bombard pit edge,
The defects such as impulse-free robustness, flange and foreign body embedding.
Embodiment 3
Bombardment granule is rustless steel steel wire cut pill, spherical, particle diameter 500 μm, drives gas for compression sky
Gas, pressure 0.6MPa, temperature is room temperature, nozzle divergence segment length 180mm, throat diameter 2.7mm,
Outlet diameter 9mm；Powder feeding nebulizer gas pressure is atmospheric pressure；The 2 online powder feedings in tunnel；Use No. 600 SiC
Sbrasive belt grinding, No. 1200 diamond abrasive band polishings, final random pattern mean parameter: the Ra that obtains is
9 μm, Rz is 55 μm, and RPC is 33/cm, and it is smooth, without hair that microscopic analysis shows to bombard pit edge
The defects such as thorn, flange and foreign body embedding.
Claims (5)
1. a thin band continuous casting crystallization roller adjustable controlled high roughness texturing surface preparation method, it uses contracting
Put type nozzle, and lead to main gas and the powder particle stream accelerated by powder feeding carrier gas respectively, form gas
Gu two-phase flow, bombardment is to crystal roller surface repeatedly, formed be made up of bombardment hole overlay structure with
Machine pattern, finally to crystal roller surface grinding and polishing, it is thus achieved that crystal roller surface texturing surface
Pattern: Ra is 1 μm-25 μm；Rz is 3-300 μm, and RPc is 5-50/cm；Wherein,
Powder particle bombardment technological parameter is: Rz, Ra=f (P, T), P: main gas pressure,
T: gas temperature；
Wherein: Rz=K0+K1*P+K2*T-K3*P*P-K4*T*T+K5*P*T；
K0:40-50；K1:20-30；K2:0-1；K3:3-4；K4:0-1；K5:0-1；
Ra=Rz/k, k=4～6；
Main gas pressure is 0.2～3.5MPa, gas flow 10～100Nm3/h；Gas temperature T
For room temperature～400 DEG C；Described particle diameters is 1～1000 μm；Described powder particle is not
Rust steel steel wire cut pill, its hardness is HRC30～HRC65.
2. prepared by the adjustable controlled high roughness texturing surface of thin band continuous casting crystallization roller as claimed in claim 1
Method, is characterized in that, described nozzle is scaling type nozzle, and it includes contraction section, larynx successively
Portion, expansion segment；Throat diameter 2.5～3.8mm, expansion segment length 30～300mm, expansion segment goes out
Mouth diameter 5～20mm.
3. prepared by the adjustable controlled high roughness texturing surface of thin band continuous casting crystallization roller as claimed in claim 1
Method, is characterized in that, described powder particle uses powder feeder conveying, powder feeder powder feeding pipe internal diameter
It is 2.5～10.0mm；Powder particle nebulizer gas pressure is atmospheric pressure～3.5MPa；Powder feeding carrier gas flux
0～35Nm3/h。
4. the adjustable controlled high roughness texturing surface of thin band continuous casting crystallization roller as described in claim 1 or 3
Preparation method, is characterized in that, described powder particle uses the online powder feeding of multichannel.
5. prepared by the adjustable controlled high roughness texturing surface of thin band continuous casting crystallization roller as claimed in claim 1
Method, is characterized in that, described grinding and finishing method, initially with the carbonization of 180～No. 600
Silicon or the thick polishing processing of diamond abrasive band, re-use carborundum or the boart boart of 320～No. 1200
Band finishing polish, is finally completely eliminated the defects such as the bombardment burr of pit edge, flange.
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| CN106272087B (en) * | 2015-05-29 | 2019-09-20 | 宝山钢铁股份有限公司 | A kind of thin band continuous casting crystallization roller texturing surface specific morphology preparation method |
| CN106311758B (en) * | 2015-06-30 | 2017-10-31 | 宝山钢铁股份有限公司 | It is suitable for the lower work roller surface initial roughness synthetic setting method of tandem mills |
| KR101767749B1 (en) * | 2015-11-10 | 2017-08-14 | 주식회사 포스코 | Surface treatment method and manufactured casting roll thereby |
| CN111590468B (en) * | 2020-07-03 | 2021-11-23 | 常德力元新材料有限责任公司 | Manufacturing device for metal thin strip with large roughness and high specific surface area |
| EP4023358A1 (en) * | 2021-01-05 | 2022-07-06 | Speira GmbH | Release free aluminium strip casting |
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| JP2003039325A (en) * | 2001-07-26 | 2003-02-13 | Nkk Corp | Surface roughness adjusting method for metal body and manufacturing method for the same |
| CN101003126A (en) * | 2006-01-18 | 2007-07-25 | 宝山钢铁股份有限公司 | Method for coarsening surface by erosion of hard grains in high speed |
| CN102259172B (en) * | 2010-05-25 | 2013-04-24 | 宝山钢铁股份有限公司 | Method for texturing surface of strip-casting crystallization roller |
| CN102381878B (en) * | 2010-08-31 | 2013-12-25 | 宝山钢铁股份有限公司 | Manufacturing method of flat roller with self-texturing feature |
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| CN103419137B (en) * | 2012-05-25 | 2015-10-28 | 宝山钢铁股份有限公司 | A kind of roller surface hardening and roughness control method |
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