CN104438355A - Hot rolling flattening technology for eliminating strip steel wave shape defects - Google Patents

Abstract

The invention belongs to the field of steel rolling technologies, and discloses a hot rolling flattening technology for eliminating strip steel wave shape defects. The technology includes the following steps that the sizes of wave shapes are measured; the minimum elongation percentage delta epsilon needed for eliminating the wave shape defects is obtained; according to the minimum elongation percentage delta epsilon, the flattening rolling force is determined; a flattening machine executes flattening operation according to the flattening rolling force, wherein the sizes of the wave shapes include wave heights and wave distances. An elongation percentage-rolling force calculation model of the hot rolling flattening machine is established, and therefore the set rolling force which is used for eliminating wave shapes, different in size, of supplied materials and needed for the hot rolling flattening machine can be accurately calculated under different service lives of rollers. In combination with appropriate parameter setting of the hot rolling flattening technology and a matched shape scheme of the working roller and the supporting roller, the wave shape defects, different in size, of a hot rolled sheet can be eliminated in the process of one-time flattening, and repeated flattening is not needed.

Description

A kind of Study on Heat Strip Skin Process method of cancellation band steel shape wave defect

Technical field

The present invention relates to technical field of steel rolling, particularly a kind of Study on Heat Strip Skin Process method of cancellation band steel shape wave defect.

Background technology

Hot rolled thin specification product, its rolling strip shape quality is difficult to control, and after section cooling is curling, usually along with the shape wave defect of different size, is difficult to meet the high request of client to sheet panel top shape.And hot-rolled leveling operation is last procedure determining hot-strip production board shape, by rational flattening process operation, setting and roll system arrangement, the shape wave of the different size of supplied materials can be eliminated, improve SPHC finished product strip shape quality.

Existing levelling method is mainly for some set shape wave, such as wave is apart from the shape wave at 130mm, unrestrained high about 15mm, the shape wave of various different size cannot be adapted on a large scale, thus cause finishing operations repeatedly to repeat, while reducing operating efficiency, also cause the significantly raising of smooth cost; On the other hand, existing process cannot eliminate the smooth middle and later periods, the problem smooth not in place that the abrasion of roll local excessive causes.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of planisher that promotes to the adaptation of the shape wave defect of different size and smooth ability.

For solving the problems of the technologies described above, the invention provides a kind of Study on Heat Strip Skin Process method of cancellation band steel shape wave defect, comprising the following steps:

Measure shape wave size;

Obtain the minimum percentage elongation △ ε eliminated needed for described shape wave defect;

Skin pass rolling power is determined according to described minimum percentage elongation △ ε;

Finishing operations is performed according to above-mentioned skin pass rolling power by planisher;

Wherein, described shape wave size comprises: the high and unrestrained distance of wave; Pass through formula:

$\mathrm{\Δ\ϵ}\≥{\left(\frac{\mathrm{\π}}{2}\right)}^2({\left(\frac{h_0}{d_0}\right)}^2-{\left(\frac{h_1}{d_1}\right)}^2)$

Calculate minimum percentage elongation △ ε; h ₀for the smooth front wave of supplied materials is high, h ₁for the wave after smooth is high; d ₀for the smooth front wave distance of supplied materials, d ₁for the wave distance after smooth.

Further, described minimum percentage elongation △ ε is used for increasing offset before skin pass rolling power calculates; The scope of described offset is 0 ~ 0.6% of minimum percentage elongation △ ε.

Further, the working roll of described planisher adopts the parabola roll forming of negative 50um.

Further, belt steel flating velocity interval is that 250m ~ 400m is per minute; The entrance tension range of planisher is 60KN ~ 90KN; The output range of planisher is 260KN ~ 300KN.

Further, described finishing operations process comprises: prometaphase and middle and later periods;

Wherein, in the smooth prometaphase, the bending roller force adjustable range of working roll is 0 ~ 5t; In the smooth middle and later periods, progressively strengthen negative roller to-10t ~-30t.

Further, the roll shifting mode of described working roll: often smooth 8 astragal steel play 400mm, and the stroke range of play is-200mm ~ 200mm back and forth.

The Study on Heat Strip Skin Process method of cancellation band steel shape wave defect provided by the invention is by establishing a kind of hot rolling and leveling machine percentage elongation-tube rolling simulation model, when can calculate the different size shape waves of elimination supplied materials and different work roll cooling roller phase accurately, the roll-force size of the required setting of hot rolling and leveling machine.In conjunction with suitable Study on Heat Strip Skin Process setting parameter and supporting working roll, backup roll contour scheme, make the SPHC along with different size shape wave defect can in a formation process, its shape wave defect is eliminated, and smooth operation need not be carried out repeatedly, greatly improve smooth efficiency and quality.

Accompanying drawing explanation

Fig. 1 bears convexity roll forming schematic diagram for the planisher working roll that the embodiment of the present invention provides.

Detailed description of the invention

See Fig. 1, the Study on Heat Strip Skin Process method of a kind of cancellation band steel shape wave defect that the embodiment of the present invention provides, comprises the following steps:

Measure shape wave size;

Obtain the minimum percentage elongation △ ε eliminated needed for shape wave defect;

Skin pass rolling power is determined according to minimum percentage elongation △ ε;

Finishing operations is performed according to above-mentioned skin pass rolling power by planisher;

Wherein, described shape wave size comprises: the high and unrestrained distance of wave; Pass through formula:

$\mathrm{\Δ\ϵ}\≥{\left(\frac{\mathrm{\π}}{2}\right)}^2({\left(\frac{h_0}{d_0}\right)}^2-{\left(\frac{h_1}{d_1}\right)}^2)$

Calculate minimum percentage elongation △ ε; h ₀for the smooth front wave of supplied materials is high, h ₁for the wave after smooth is high; d ₀for the smooth front wave distance of supplied materials, d ₁for the wave distance after smooth.

When supplied materials has obvious shape wave defect, must set a suitable percentage elongation, too little, be not enough to eliminate shape wave, then make skin pass rolling power increase sharply too greatly, roll wear is accelerated, and is difficult to control shape wave smooth latter stage.

In order to tackle the impact that equipment room and band steel and equipment room coordinate, minimum percentage elongation △ ε is used for increasing offset before skin pass rolling power calculates; The scope of described offset is 0 ~ 0.6% of minimum percentage elongation △ ε, thus ensures the precision of calculating.

Adopt percentage elongation-tube rolling simulation model can promote computational accuracy more accurately.

Hot rolling and leveling machine shape of working roll adopts the parabolic of negative 50 μm, and backup roll contour is plain-barreled roll; Thus optimization roll system arrangement, extend and use the roller phase, greatly optimize the object of flattening technological parameter.

Belt steel flating velocity interval is that 250m ~ 400m is per minute; The entrance tension range of planisher is 60KN ~ 90KN; The output range of planisher is 260KN ~ 300KN.The shape wave defect higher for wave, wave distance is less, must adopt less smooth speed, less entrance tension force and larger outlet tension force.

Finishing operations process comprises: prometaphase and middle and later periods;

Wherein, in the smooth prometaphase, the bending roller force adjustable range of working roll is 0 ~ 5t; In the smooth middle and later periods, progressively strengthen negative roller to-10t ~-30t.Thus the impact smooth not in place that the concentrated wear of reduction working roll causes.

The roll shifting mode of working roll: often smooth 8 astragal steel play 400mm, and the stroke range of play is-200mm ~ 200mm back and forth.Optimize roll shifting operation, promote the effect eliminating shape wave defect.

A kind of hot rolling and leveling machine percentage elongation-tube rolling simulation model of the Study on Heat Strip Skin Process method establishment of the cancellation band steel shape wave defect that the present embodiment provides, when can calculate the different size shape waves of elimination supplied materials and different work roll cooling roller phase accurately, the roll-force size of the required setting of hot rolling and leveling machine.In conjunction with suitable Study on Heat Strip Skin Process setting parameter and supporting working roll, backup roll contour scheme, make the SPHC along with different size shape wave defect can in a formation process, its shape wave defect is eliminated, and secondary even three smooth operations need not be carried out, effectively solve a Strip Shape Control difficult problem for SPHC.Under the main trend of " with hot Dai Leng " and " energy-saving and emission-reduction ", possesses the effect that stronger energy-saving and cost-reducing, synergy increase income.

It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (6)

1. a Study on Heat Strip Skin Process method for cancellation band steel shape wave defect, is characterized in that, comprise the following steps:

Measure shape wave size;

Obtain the minimum percentage elongation △ ε eliminated needed for described shape wave defect;

Skin pass rolling power is determined according to described minimum percentage elongation △ ε;

Finishing operations is performed according to above-mentioned skin pass rolling power by planisher;

Wherein, described shape wave size comprises: the high and unrestrained distance of wave; Pass through formula:

$\mathrm{\Δ\ϵ}\≥{\left(\frac{\mathrm{\π}}{2}\right)}^2({\left(\frac{h_0}{d_0}\right)}^2-{\left(\frac{h_1}{d_1}\right)}^2)$

Calculate minimum percentage elongation △ ε; h ₀for the smooth front wave of supplied materials is high, h ₁for the wave after smooth is high; d ₀for the smooth front wave distance of supplied materials, d ₁for the wave distance after smooth.

2. the Study on Heat Strip Skin Process method of cancellation band steel shape wave defect as claimed in claim 1, is characterized in that: described minimum percentage elongation △ ε is used for increasing offset before skin pass rolling power calculates; The scope of described offset is 0 ~ 0.6% of minimum percentage elongation △ ε.

3. the Study on Heat Strip Skin Process method of cancellation band steel shape wave defect as claimed in claim 1, is characterized in that: the working roll of described planisher adopts the parabola roll forming of negative 50um.

4. the Study on Heat Strip Skin Process method of cancellation band steel shape wave defect as claimed in claim 3, is characterized in that: belt steel flating velocity interval is that 250m ~ 400m is per minute; The entrance tension range of planisher is 60KN ~ 90KN; The output range of planisher is 260KN ~ 300KN.

5. the Study on Heat Strip Skin Process method of cancellation band steel shape wave defect as claimed in claim 1, it is characterized in that, described finishing operations process comprises: prometaphase and middle and later periods;

Wherein, in the smooth prometaphase, the bending roller force adjustable range of working roll is 0 ~ 5t; In the smooth middle and later periods, progressively strengthen negative roller to-10t ~-30t.

6. the Study on Heat Strip Skin Process method of cancellation band steel shape wave defect as claimed in claim 5, it is characterized in that, the roll shifting mode of described working roll: often smooth 8 astragal steel play 400mm, and the stroke range of play is-200mm ~ 200mm back and forth.