阅读说明：本技术 一种带钢卷取张力的确定方法 (Method for determining strip steel coiling tension ) 是由 李春明 何涛 乔军 于 2021-09-07 设计创作，主要内容包括：本发明涉及一种带钢卷取张力的确定方法,其可包括以下步骤：获取带钢的波长L、波高H和弹性模量E；根据波长L和波高H计算带钢版型I-unit和弧长S,其中,I-unit＝(π/2)～(2)×(H/L)～(2)×10～(5),S＝2πH+(L/2)/(2H/L)×2ATAN(2H/L)/2π；根据波长L和弧长S计算延伸率δ,进而得到单位张力N,其中,δ＝(S-L)/S,N＝E×δ；判断I-unit是否大于预设值,若I-unit大于预设值,则确定带钢卷取张力为I-unit对应的单位张力N,否则确定带钢卷取张力为该预设值对应的单位张力N。采用本发明,能够提供合理卷取张力,降低卷取机负荷,提高带钢质量,避免出现塌卷现象。(The invention relates to a method for determining the coiling tension of a strip steel, which comprises the following steps: obtaining the wavelength L, the wave height H and the elastic modulus E of the strip steel; calculating the strip steel model I-unit and the arc length S according to the wavelength L and the wave height H, wherein I-unit is equal to (pi/2) 2 ×(H/L) 2 ×10 5 S ═ 2 pi H + (L/2)/(2H/L) × 2ATAN (2H/L)/2 pi; calculating an elongation rate delta according to the wavelength L and the arc length S, and further obtaining a unit tension N, wherein delta is (S-L)/S, and N is E multiplied by delta; and judging whether the I-unit is larger than a preset value, if so, determining that the coiling tension of the strip steel is the unit tension N corresponding to the I-unit, and otherwise, determining that the coiling tension of the strip steel is the unit tension N corresponding to the preset value. The invention can provide reasonable coiling tension, reduce the load of the coiling machine, improve the quality of the strip steel and avoid the phenomenon of coil collapse.)

1. A method for determining the coiling tension of a strip steel is characterized by comprising the following steps:

obtaining the wavelength L, the wave height H and the elastic modulus E of the strip steel;

calculating the strip steel model I-unit and the arc length S according to the wavelength L and the wave height H, wherein,

I-unit＝(π/2)²×(H/L)²×10⁵，S＝2πH+(L/2)/(2H/L)×2ATAN(2H/L)/2π；

calculating an elongation rate delta according to the wavelength L and the arc length S, and further obtaining a unit tension N, wherein delta is (S-L)/S, and N is E multiplied by delta;

and judging whether the I-unit is larger than a preset value, if so, determining that the coiling tension of the strip steel is the unit tension N corresponding to the I-unit, and otherwise, determining that the coiling tension of the strip steel is the unit tension N corresponding to the preset value.

2. The method of claim 1, wherein the predetermined value is 5.

3. The method of claim 1, wherein the strip has a thickness of 3mm or less and a profile I-unit of less than 25.

Technical Field

The invention relates to the field of cold-rolled strip production, in particular to a method for determining strip steel coiling tension.

Background

Figure 3 shows the coiling of a strip with good coiling quality requiring a reasonable tension to be established between the tension roll 1 and the coiler 2 before coiling. In the field of cold strip production, some slab coiling can determine strip coiling tension through bending calculation. Some rolling line or withdrawal and straightening line recoiling machines need a force output deviceAnd the coiling tension can be calculated in a manner of force energy parameter calculation with the plastic deformation of the strip steel. Some strip steel processing lines need to consider that steel coils do not collapse after strip steel is coiled, the uncoiling tension of downstream procedures is not enough to enable the steel coils to slide between layers, and the strip steel tension is set through practical experience. In addition, the thickness of the strip steel of the common cold-rolled stainless steel product is 0.3-2.5 mm, and the unit tension of the strip steel of the stainless steel bright annealing unit is controlled at 15N/mm²～40N/mm²The unit tension of the strip steel of the stainless steel annealing pickling line is controlled to be 15N/mm²～30N/mm²These parameters are empirically selected and require the ability of the coiler to provide these tensions.

At present, in the thin strip steel engineering design, the tension of the coiling machine is selected, except that the coiling machine which participates in the plastic deformation can calculate and determine the tension according to the force, the coiling machine is generally designed according to the maximum tension which is selected by experience or reference similar engineering, and the mode can cause insufficient or excessive coiling tension.

Disclosure of Invention

The invention aims to provide a method for determining the coiling tension of a strip steel so as to solve the problems. Therefore, the invention adopts the following specific technical scheme:

a method of determining a strip coiling tension may include the steps of:

obtaining the wavelength L, the wave height H and the elastic modulus E of the strip steel;

calculating the strip steel model I-unit and the arc length S according to the wavelength L and the wave height H, wherein I-unit is equal to (pi/2)²×(H/L)²×10⁵，S＝2πH+(L/2)/(2H/L)×2ATAN(2H/L)/2π；

Calculating an elongation rate delta according to the wavelength L and the arc length S, and further obtaining a unit tension N, wherein delta is (S-L)/S, and N is E multiplied by delta;

and judging whether the I-unit is larger than a preset value, if so, determining that the coiling tension of the strip steel is the unit tension N corresponding to the I-unit, and otherwise, determining that the coiling tension of the strip steel is the unit tension N corresponding to the preset value.

Further, the preset value is 5.

Furthermore, the thickness of the strip steel is less than 3mm, and the plate type I-unit is less than 25.

By adopting the technical scheme, the invention has the beneficial effects that: can provide reasonable coiling tension, reduce the load of a coiling machine, improve the quality of strip steel and avoid the phenomenon of coil collapse.

Drawings

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

FIG. 1 is a flowchart of a method of determining strip coiling tension according to the present invention;

FIG. 2 is a schematic view of a process of coiling a strip;

FIG. 3 is a schematic representation of the dimensions of the strip.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1-2, a method for determining the coiling tension of a strip steel may include the steps of:

s1, acquiring the wavelength L, the wave height H and the elastic modulus E of the strip steel, wherein the parameters can be obtained by corresponding industry standards or through test measurement.

S2, calculating the strip steel model I-unit and the arc length S according to the wavelength L and the wave height H, wherein the model I-unit has the calculation formula:

I-unit＝(π/2)²×(H/L)²×10⁵，

for cold rolled products with the strip steel thickness of less than 3mm, the plate type I-unit is usually between 3 and 25.

The calculation formula of the arc length S is as follows:

S＝2πH+(L/2)/(2H/L)×2ATAN(2H/L)/2π。

and S3, calculating the elongation delta according to the wavelength L and the arc length S, and further obtaining the unit tension N. The difference between the arc length S and the wavelength L is the portion of the strip that needs to be elastically extended. The calculation formula of the elongation δ of elastic deformation is as follows:

δ＝(S-L)/S。

accordingly, by the elongation δ required for the strip to be wound up, the maximum unit tension N that can be provided by the coiler is calculated by the following formula:

N＝E×δ。

and S4, judging whether the I-unit is larger than a preset value, if so, determining that the strip steel coiling tension is the unit tension N corresponding to the I-unit, otherwise, determining that the strip steel coiling tension is the unit tension N corresponding to the preset value. The preset value is related to the specification of the strip steel and is generally 5.

For cold rolled products with the strip steel thickness of less than 3mm, the plate type I-unit is usually between 3 and 25. Most of carbon steel continuous annealing units, hot galvanizing units, color coating units, electrotinning units, stainless steel annealing and pickling units and the like have the strip steel version I-unit less than 25 before coiling. The thickness of the strip steel is less than 0.7mm and the width of the strip steel is more than 1500mm in GB/T708-; the thickness of the strip steel is less than 0.7mm, and the plate type I-unit is less than 15 when the width of the strip steel is 1250 mm-1500 mm. Examples of calculations are shown in the following table:

wave height	Wavelength (horizontal)	I-unit	Arc length	Elongation percentage	Modulus of elasticity	Unit tension
							H(mm)	L(mm)		S(mm)	δ(％)	E(Mpa)	N(N/mm2)
20	2000	24.7	2000.533	0.0267％	206000	54.9
							15	2000	13.9	2000.300	0.0150％	206000	30.9
10	2000	6.2	2000.133	0.0067％	206000	13.7
							9	2000	5.0	2000.108	0.0054％	206000	11.1
7	2000	3.0	2000.065	0.0033％	206000	6.7
							5	2000	1.5	2000.033	0.0017％	206000	3.4
3	2000	0.6	2000.012	0.0006％	206000	1.2

By example calculation, when the plate type is I-unit <5, the coiling unit tension is very small, and the risks of irregular coils, collapse coils and the like can exist; therefore, when the strip steel model I-unit is less than 5, the coiling unit tension is selected according to the model I-unit which is 5.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.