CN102126185B - Shot peening process for removing scale on surface of steel belt - Google Patents
Shot peening process for removing scale on surface of steel belt Download PDFInfo
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- CN102126185B CN102126185B CN 201010598792 CN201010598792A CN102126185B CN 102126185 B CN102126185 B CN 102126185B CN 201010598792 CN201010598792 CN 201010598792 CN 201010598792 A CN201010598792 A CN 201010598792A CN 102126185 B CN102126185 B CN 102126185B
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- peening
- oxide skin
- steel band
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Abstract
The invention relates to the shot peening process, and particularly relates to a shot peening process for removing scale on the surface of a steel belt, belonging to the technical field of metallurgy rolling. The shot peening process for removing the scale on the surface of the steep belt comprises the following steps: peening shots to the upper surface; turning by a turning roll; peening shots to the lower surface; and measuring residual stress by an X-ray surveymeter. By the shot peening process for removing the scale on the surface of the steel belt, energy is saved, the product quality is promoted, and the operation efficiency is high.
Description
Technical field
The present invention is a kind of shot-blast process, and particularly a kind of shot-blast process of efficient removal steel strip surface oxide skin belongs to the metallurgy rolling technical field.
Background technology
Cold-rolled steel raw material of the prior art is hot rolled strip, steel strip surface has hard and crisp iron scale, the existence of oxide skin can have a strong impact on smooth degree, the uniformity coefficient of cold rolling back surface of steel plate, the flatness of plate shape, more can cause the damage of roll roll surface or rinse water water pump, for stainless steel, also can cause stainless steel to produce stress corrosion.
Cold rolling mill to hot rolled strip carry out cold rolling before, all must carry out pickling, and pickle need wash with a large amount of water, again through alkali lye neutralization, after the waste water resource, tend to cause serious environmental to pollute.For effective scale removal, pickling need continue the long time, cause pickling process light plate iron loss bigger, and hydrochloric acid and hydroflouric acid washing lotion have volatility and nitric acid can produce oxynitrides when pickling of stainless steel, the severe contamination air, reduce the service life of equipment in the workshop, even can cause operating personnel to poison or burn.
Produced mechanical descaling technology and mechanical-chemical associating descaling process, specifically comprise technologies such as sandblast, current sandblast, water under high pressure thermal descaling, wheel grinding, wire brush are scrubbed, roll-in, high-temperature gas reduction, above-mentioned various technological effects are limited, or because the cost reason all can't replace acid cleaning process to remove the iron scale on hot rolled strip surface.
Summary of the invention
The present invention solves the deficiencies in the prior art, provide a kind of cold-rolled strip to exempt from the pickling descaling technique, clean the technology of measuring residual stress with x-ray measuring device with water by upper surface and lower surface bead, washing, guarantee the effect that descales before cold rolling.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of shot-blast process of removing steel strip surface oxide skin may further comprise the steps:
(1), upper surface shot-peening: send into the steel band upper surface is removed in the shot-peening unit with blasting process oxide skin after the steel band uncoiling smoothing;
(2), slewing rollers reverse: after the steel band upper surface bead, by slewing rollers steel band is turned round turnback, make the original lower surface of steel band up;
(3), lower surface shot-peening: after slewing rollers reverse operation, pass through the support platform supporting steel plate in the shot-peening unit, with the oxide skin on the original lower surface of blasting process removing steel band;
(4), x-ray measuring device measures residual stress: after the oxide skin Ex-all, by X-ray measurement steel strip surface residual stress, and give cold rolling control system with the residual stress transfer of data.
Hot rolled strip uncoiling alignment, after the crop end welding, by shot blasting equipment the steel band upper surface is carried out shot-peening with scale removal, and blow away through still sticking to the oxide skin powder of steel strip surface behind the shot-peening bump by pressure-air, steel band is turned round turnback through slewing rollers with steel band then, crossing shot blasting equipment carries out shot-peening and washes away the oxide skin powder with pressure-air the steel band lower surface, clean the oxide skin powder of cleaning steel strip surface absorption with water by High-Pressure Water afterwards, measure the residual stress of steel strip surface at last by x-ray measuring device, change cold rolling roll-force size according to the residual stress of measuring.
Oxide skin of the present invention refers to that the product that generates after the oxidation reaction at high temperature takes place for hot rolled strip surface iron and oxidation, mainly by FeO, Fe
3O
4, Fe
2O
3Form, also contain the SiO of trace
2, material such as S, be included in the slice and the granular secondary oxidation skin that form in the thick block once oxidation skin that produces in the heating process and the operation of rolling.
The power of shot-peening is compressed air, and safety non-pollution can substitute the huge pickling process of serious environment pollution and energy consumption with scale removal; In the time of shot-peening energy scale removal, can also form the plasticity extruding to steel strip surface, strengthen the surface quality of steel strip surface; Shot-blast process can be eliminated trickle crackle, pipe, the scuffing defective of part of steel strip surface, especially inclusion defect, be easy to further cause the spot corrosion of steel band, traditional acid cleaning process and cold-rolling process all can't be removed inclusion defect, can only remove with shot-peening or ball blast technology to be mingled with; Compare acid cleaning process, shot-blast process is simpler, and efficient is higher, easier realization large-scale pipeline processing; The shot blasting equipment floor space is less, is convenient to add blimp and dust arrester, has avoided the reluctant problem of toxic gas in the pickling workshop; Residual stress by steel strip surface behind the X ray mensuration ball blast, can be according to the concrete needs of cold-rolling process, by changing the shot-blast process parameter, steel band to unlike material and different performance in scale removal carries out accurate preliminary treatment, change the steel strip surface performance and reduce surface roughness, the smooth implementation of convenient follow-up cold-rolling process.As the higher steel band product of surperficial quality requirement is adopted high-strength ceramic shot-peening and lower spray watt pressure, to reduce the plastic deformation of steel strip surface; The steel band product that the opposite quality requirement is lower adopts steel shot-peening and higher spray watt pressure, with further raising descale effect.
As preferably, the x-ray measuring device in the step (4) adopts the Ψ angular instrument.
As preferably, use pressure-air to wash away the oxide skin powder in step (1) and (3) earlier, clean the oxide skin powder of cleaning steel strip surface absorption with water with High-Pressure Water again.
Therefore, a kind of shot-blast process of removing steel strip surface oxide skin provided by the invention, the energy-conservation energy promotes product quality, the operating efficiency height.
The specific embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1: hot rolled strip uncoiling alignment after the crop end welding, enters blasting process.In the blasting process, at first the upper surface to steel band carries out shot-peening, uses the high-strength ceramic shot-peening, to prevent the too high damage steel strip surface of invar shot-peening hardness processed.Support platform by the steel band bottom replaces original transfer roller, the steel band lower surface all is subjected to the bottom platform support in the time of can guaranteeing shot-peening, solved the problem that shot-peening scale breading sheet causes strip deformation, pass through compressed-air atomizer in the blasting process simultaneously, use pressure to blow off by shot-peening as the compressed air of 0.45MPa and smash the oxide skin powder that is attached to steel strip surface, High-Pressure Water by 3MPa pressure washes away the oxide skin powder of cleaning steel strip surface absorption again, improve the effect that descales of shot-peening, after the upper surface bead of steel band, by slewing rollers steel band is turned round turnback, make the steel plate lower surface turn to the top, the oxide skin of tearing the steel plate lower surface by plastic deformation significantly improves the efficient of in the later process steel plate lower surface shot-peening being eliminated oxide skin simultaneously.
After steel band reversed by slewing rollers, the former lower surface to steel band on the support platform carried out shot-peening, used the compressed air of 0.45MPa to wash away the oxide skin powder simultaneously.After steel band lower surface bead, the iron scale on hot rolled strip surface comes off because of collision and the vibrations overwhelming majority of shot-peening, but still have powder adherence in steel strip surface, so still the High-Pressure Water by 3MPa pressure washes away steel band to remove remaining powder, on this station, can carry out High-Pressure Water simultaneously to the steel band upper and lower surface and wash away, prevent from that roll is rolled into oxide skin when cold rolling to cause product defects in the steel band.
After cleaning operation with water, steel band is carried out x-ray measuring device measure residual stress, the degree that this stress numerical explanation shot-peening is strengthened steel strip surface can be adjusted each passage roll-force according to residual stress numerical value when cold rolling.When measuring the steel strip surface residual stress when big, illustrate that the plastic deformation of steel strip surface is bigger in the blasting process, the deformation rate of several passages before when cold rolling total deformation rate and corresponding raising are cold rolling in the middle of then reducing to increase the steel strip surface plastic deformation, is repaired the shot-peening bump impression on surface.Otherwise cold rolling total deformation rate in the middle of can increasing is to improve the rolling accuracy of product.Be example with four frame cold continuous rollings: according to first three frame with " constant power allowance ", the extreme trace frame is distributed with the small deformation amount, in certain model steel band rolling, the volume under pressure that slubbing can be rolled down to the extreme trace rolling process is decided to be respectively: 1.185mm, 0.839mm, 0.589mm, 0.560mm.When detecting plastic deformation that shot-peening causes when big, the volume under pressure of each frame can be decided to be respectively: 1.408mm, 0.742mm, 0.430mm, 0.560mm.
Embodiment 2:
After hot rolled strip uncoiling alignment, the crop end welding, enter blasting process.In the blasting process, at first the upper surface to steel band carries out shot-peening, and the surface quality of finished product cold-rolled strip has higher requirements, can reduce ceramic shot-peening diameter to 0.2mm and the compressed air pressure that reduce to drive shot-peening to 0.25MPa, to reduce the steel strip surface plastic deformation.Support platform by the steel band bottom replaces original transfer roller, pass through compressed-air atomizer simultaneously at shot-peening in the blasting process, use pressure to blow off by shot-peening as the compressed air of 0.6MPa and smash the oxide skin powder that is attached to steel strip surface, High-Pressure Water by 4.7MPa pressure washes away the oxide skin powder of cleaning steel strip surface absorption again, improves the effect that descales of shot-peening.At this moment, improving compressed air is in order to eliminate the inadequate influence of shot-peening with the pressure that washes away current.After the upper surface bead of steel band, by slewing rollers steel band is turned round turnback, make the steel plate lower surface turn to the top.
After steel band reversed by slewing rollers, the former lower surface to steel band on the support platform carried out shot-peening, used 0.6MPa compressed air to wash away the oxide skin powder simultaneously.Clean steel band with water to remove remaining powder by the 4.7MPa High-Pressure Water.By reducing the shot-peening impulsive force, increase the impact strength of compressed air and High-Pressure Water, can improve the surface quality of steel band behind the broken phosphorus of shot-peening.
After cleaning operation with water, steel band is carried out x-ray measuring device measure residual stress, the degree that this stress numerical explanation shot-peening is strengthened steel strip surface can be adjusted each passage roll-force according to residual stress numerical value when cold rolling.Concrete control method is with embodiment 1.
Embodiment 3:
After 430 hot-rolled stainless steel steel band uncoiling alignments, the crop end welding, enter blasting process.In the blasting process, at first the upper surface to stainless steel belt carries out shot-peening, because the stainless steel watch surface oxidized skin is very thin, can use 0.20MPa compressed air-driven diameter to be the high-strength ceramic shot-peening of 0.08mm, improve the impact density of bullet by the way that reduces the stainless steel belt transfer rate, to reduce the steel strip surface plastic deformation as far as possible.Pass through compressed-air atomizer simultaneously at shot-peening in the blasting process, use pressure to blow off by shot-peening as the compressed air of 0.5MPa and smash the oxide skin powder that is attached to steel strip surface, High-Pressure Water by 3MPa pressure washes away the oxide skin powder of cleaning steel strip surface absorption again, improve the effect that descales of shot-peening, after the upper surface bead of steel band, by slewing rollers steel band is turned round turnback, make the steel plate lower surface turn to the top.
After stainless steel belt reversed by slewing rollers, the former lower surface to stainless steel belt on the support platform carried out shot-peening, used 0.5MPa compressed air to wash away the oxide skin powder simultaneously.Clean stainless steel belt with water to remove remaining powder by the 3MPa High-Pressure Water.By reducing the shot-peening impulsive force, increase the impact strength of compressed air and High-Pressure Water, can improve the surface quality of steel band behind the broken phosphorus of shot-peening.
After cleaning operation with water, stainless steel belt is carried out x-ray measuring device measure residual stress, the degree that this stress numerical explanation shot-peening is strengthened steel strip surface can be adjusted each passage roll-force according to residual stress numerical value when cold rolling.With reference to embodiment 1, because stainless steel belt is higher to the requirement of surface quality, four stand mill is set to 1.408mm, 0.862mm, 0.439mm, 0.560mm by first road respectively to the roll-force of extreme trace.When detecting plastic deformation that shot-peening causes when big, the volume under pressure of each frame can be decided to be respectively: 1.634mm, 0.875mm, 0.386mm, 0.560mm.
Claims (2)
1. shot-blast process of removing steel strip surface oxide skin is characterized in that may further comprise the steps:
(1), upper surface shot-peening: send into the shot-peening station is removed the steel band upper surface with blasting process oxide skin after the steel band uncoiling smoothing;
(2), slewing rollers reverse: after the steel band upper surface bead, by slewing rollers steel band is turned round turnback, make the original lower surface of steel band up, and tear the oxide skin of steel strip surface by plastic deformation significantly;
(3), the lower surface shot-peening: after slewing rollers reverse operation, enter another shot-peening station after, remove oxide skin on the original lower surface of steel band with blasting process;
(4), x-ray measuring device measures residual stress: after the oxide skin Ex-all, by X-ray measurement steel strip surface residual stress, and give cold rolling control system with the residual stress transfer of data;
X-ray measuring device in the step (4) adopts the Ψ angular instrument;
Pass through compressed-air atomizer simultaneously in step (1) and (3) blasting process, using pressure is that 0.5 to 0.6MPa compressed air blows off by shot-peening and smashes the oxide skin powder that is attached to steel strip surface, and the High-Pressure Water by 3 to 5MPa pressure washes away the oxide skin powder that clean steel strip surface is adsorbed again.
2. a kind of shot-blast process of removing steel strip surface oxide skin according to claim 1 is characterized in that: in the shot-peening station in step (1) and the step (3), steel band supports to prevent that by support platform it from gross distortion taking place.
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| CN 201010598792 CN102126185B (en) | 2010-09-29 | 2010-12-21 | Shot peening process for removing scale on surface of steel belt |
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| CN201010296686.5 | 2010-09-29 | ||
| CN201010296686 | 2010-09-29 | ||
| CN 201010598792 CN102126185B (en) | 2010-09-29 | 2010-12-21 | Shot peening process for removing scale on surface of steel belt |
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| CN102126185B true CN102126185B (en) | 2013-07-10 |
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| CN107541737B (en) * | 2016-06-27 | 2019-07-23 | 宝山钢铁股份有限公司 | The method for improving belt steel surface pickling quality |
| CN114700882A (en) * | 2022-04-06 | 2022-07-05 | 攀钢集团研究院有限公司 | Method for online removing oxide skin on inner surface and outer surface of seamless steel tube |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864880A (en) * | 2006-06-20 | 2006-11-22 | 刘复麟 | An acidless descaling process for cold rolled steel strip and manufacturing device thereof |
| CN101138837A (en) * | 2007-08-23 | 2008-03-12 | 宋建民 | Cold-rolled steel strip acid-free descaling technique and special device thereof |
| CN101664759A (en) * | 2009-09-28 | 2010-03-10 | 西部金属材料股份有限公司 | Preparation method of small-specification thick-wall titanium alloy tubular product |
-
2010
- 2010-12-21 CN CN 201010598792 patent/CN102126185B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864880A (en) * | 2006-06-20 | 2006-11-22 | 刘复麟 | An acidless descaling process for cold rolled steel strip and manufacturing device thereof |
| CN101138837A (en) * | 2007-08-23 | 2008-03-12 | 宋建民 | Cold-rolled steel strip acid-free descaling technique and special device thereof |
| CN101664759A (en) * | 2009-09-28 | 2010-03-10 | 西部金属材料股份有限公司 | Preparation method of small-specification thick-wall titanium alloy tubular product |
Non-Patent Citations (1)
| Title |
|---|
| 周良俊 等.武钢精轧板型控制及设备特点.《轧钢》.1994,(第3期),23-26. * |
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Address after: 311263 Industrial Zone, Dai Town, Xiaoshan District, Zhejiang, Hangzhou Patentee after: Zhejiang Jiulong Kitchenware Group Co., Ltd Address before: 311263 Industrial Zone, Dai Town, Xiaoshan District, Zhejiang, Hangzhou Patentee before: Hangzhou Jiulong Kitchen Tools Co.,Ltd. |