CN114260316B - Driven roller of second intermediate roller of Sendzimir mill - Google Patents
Driven roller of second intermediate roller of Sendzimir mill Download PDFInfo
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- CN114260316B CN114260316B CN202010973935.3A CN202010973935A CN114260316B CN 114260316 B CN114260316 B CN 114260316B CN 202010973935 A CN202010973935 A CN 202010973935A CN 114260316 B CN114260316 B CN 114260316B
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- 238000005096 rolling process Methods 0.000 claims abstract description 23
- 230000014759 maintenance of location Effects 0.000 claims abstract description 9
- 230000002035 prolonged effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a driven roller shape of a second intermediate roller of a Send Jimi rolling mill, wherein the roller shape of a driven roller (5) of the second intermediate roller is parabolic, elliptic curve or quadric curve, the axis of the driven roller is taken as the x axis, the radial direction of the driven roller is taken as the y axis, the top point of the roller body end of the driven roller is taken as the origin, and the convexity curve equation of the parabolic roller shape is y=delta-delta (2 x/L-1) 2 The convexity curve equation of the elliptic curve roll shape isConvexity curve equation for the four-curve roll shape is y=δ - δ (2 x/L-1) 4 Wherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.The utility model optimizes the roller shape from the existing common arc curve to parabolic, elliptic or four-time curve, can further reduce the contact stress between the Sendzimir roller system rollers, improve the convexity retention performance of the driven roller, enhance the strip shape control capability of the rolling mill on strip steel, prolong the service life of the second intermediate roller and reduce the production cost of silicon steel.
Description
Technical Field
The utility model relates to a roller system for a Sendzimir rolling mill, in particular to a driven roller of a second intermediate roller of the Sendzimir rolling mill.
Background
The twenty-high sendzimir mill mainly comprises a plurality of rolls, such as a working roll 2, a first intermediate roll 3, a second intermediate roll, a backing bearing roll 6, etc., and is shown in fig. 1 (only 10 rolls of the upper half roll system of the strip steel 1 are shown in fig. 1). The second intermediate roll comprises a driving roll 4 positioned at two sides and a driven roll 5 (idler roll) positioned in the middle, wherein the driving roll 4 mainly plays a role in driving the rolling mill to stably work in the whole roll system. Referring to fig. 2, a driving roller 4 of the prior art is a flat roller, and a driven roller 5 is a double-sided 200 μm arc convexity roller. The curve equation of the roller shape of the driven roller 5 isWherein L is the length of the roll surface, the value range of x is 0-L, the middle convexity is 2 delta, and the arc radius R=L 2 /(8 delta) +delta/2. While the adjacent first intermediate roll 3, backing bearing roll 6, etc. are generally flat rolls, roll shape designs with a chamfer structure are employed only in a certain range of the end portions.
With the continuous high speed of modern silicon steel rolling and the increasingly stringent requirements on the surface quality of strip steel, the second intermediate roller also exposes problems in the use process:
(1) The wear resistance is relatively insufficient, the service time of the second intermediate roller on the machine is generally only about 2 weeks, and the frequent roller replacement makes the production organization very complicated, so that the use cost of the roller is greatly increased.
(2) The convexity retention capability of the driven roller 5 of the second intermediate roller is insufficient, and as the abrasion convexity is continuously reduced, the shape control of the silicon strip steel is affected in the later stage.
Therefore, in addition to roll material factors, roll formation of the second intermediate roll is critical to reduce roll face stress concentrations, reduce localized excessive wear, and thereby extend roll life, whether wear resistance or crown retention.
The Chinese utility model patent with the patent number ZL201520177152.9 discloses a wear-resistant roller with original convexity, and only the roller shape is mentioned as a secondary curve; the Chinese utility model patent with the patent number ZL201510890796.7 discloses a second intermediate roll of a Sendzimir rolling mill, wherein the roll body of the second intermediate roll adopts a mode of middle straight line, end sinusoidal curve and middle circular arc transition; the Chinese patent No. ZL201110070274.4 discloses a middle roll shape of a cold tandem mill, wherein the roll shape is a combination of a cubic polynomial and a sine function.
However, from the standpoint of the contact stress of the intermediate rolls, such multiple intermediate roll shapes in the prior art, particularly when the intermediate roll is matched with other surrounding work rolls (first intermediate roll 3) and back-up rolls (back-up rolls 6) after the intermediate roll is formed in multiple steps, problems such as large local contact stress of the roll surface, many points of concentrated stress, complicated processing and manufacturing processes and the like are difficult to avoid at the curve connection of the multiple steps of roll shapes, and these problems tend to be more prominent in the background of the continuous emphasis of the roll shape (chamfer) of the conventional first intermediate roll 3 and back-up rolls 6.
Disclosure of Invention
The utility model aims to provide a driven roller of a second intermediate roller of a Sendzimir rolling mill, the roller shape of the roller is optimized into parabola, ellipsoids or quadric curves from the conventional common circular arc curve, the contact stress between the Sendzimir roller system rollers can be further reduced, the convexity retention performance of the driven roller is improved, and the service life of the second intermediate roller is prolonged.
The utility model is realized in the following way:
a driven roller of a second intermediate roller of a Sendzimir rolling mill,
the roller shape of the driven roller (5) of the second intermediate roller is optimized into a one-section curve, so that the contact stress between the rollers is reduced, the convexity retention performance of the driven roller is improved, and the service life of the second intermediate roller is prolonged; the one-segment curve is parabolic, elliptic or quadric curve,
when the curve is parabolic, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the vertex of the end part of the roller body of the driven roller (5) is taken as the origin, and the convexity curve equation of the parabolic roller shape is y=delta-delta (2 x/L-1) 2 Wherein, the middle convexity is 2 delta, the length of the roller surface is L, and the value range of x is 0-L;
in the case of elliptic curve, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the top point of the roller body end part of the driven roller (5) is taken as the origin, and the convexity curve equation of the elliptic curve roller shape is taken asWherein, the middle convexity is 2 delta, the length of the roller surface is L, and the value range of x is 0-L;
in the case of four curves, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the vertex of the end part of the roller body of the driven roller (5) is taken as the origin, and the convexity curve equation of the four-curve roller shape is y=delta-delta (2 x/L-1) 4 Wherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, the roll shape of the driven roll of the second intermediate roll of the sendzimir mill is optimized into a section of parabola, elliptic line or four-time curve, so that the roll surface contact stress of the second intermediate roll is reduced, the surface wear resistance of the driven roll is effectively improved, the service life of the roll is prolonged, and the use cost of the roll is reduced, thereby reducing the rolling production cost of silicon steel.
2. The utility model improves the convexity retention performance of the driven roller and the control capability of the Sendzimir mill on the plate shape, thereby improving the rolling quality of the silicon strip steel.
3. The one-section roller curve adopted by the utility model can be processed and manufactured by a special numerical control grinder, and is simpler, more convenient and easier to process and has high processing efficiency than that of the multi-section roller curve.
4. The utility model can be applied to the roller systems of multi-roller rolling mills such as eighteen-roller Sen Jim rolling mill, twenty-roller Sen Jim rolling mill and the like, improves the economic benefit of the rolling mill and has wide application prospect.
The utility model optimizes the roller shape from the existing common arc curve to parabolic, elliptic or four-time curve, can further reduce the contact stress between the Sendzimir roller system rollers, improve the convexity retention performance of the driven roller, enhance the strip shape control capability of the rolling mill on strip steel, prolong the service life of the second intermediate roller and reduce the production cost of silicon steel.
Drawings
FIG. 1 is a schematic diagram of the roll profile of a sendzimir mill;
FIG. 2 is a front view of a second intermediate roll driven roller of a sendzimir mill;
FIG. 3 is a schematic view of the driven roll profile of a second intermediate roll of the sendzimir mill of the present utility model;
fig. 4 is a comparative schematic diagram of the contact stress distribution between the driven roller and the first intermediate roller of the second intermediate roller of the present utility model and the prior art (example 1), wherein the broken line is the stress distribution line of the original circular arc convexity roller shape in the prior art, and the solid line is the stress distribution line of the optimized roller shape in the present utility model.
In the figure, 1 band steel, 2 working rolls, 3 first intermediate rolls, 4 driving rolls, 5 driven rolls and 6 backing bearing rolls.
Detailed Description
The utility model will be further described with reference to the drawings and the specific examples.
Referring to fig. 2 and 3, a driven roller of a second intermediate roller of a sendzimir millThe roller shape of the driven roller 5 of the second intermediate roller is parabolic, the axis of the driven roller 5 is taken as the x axis, the radial direction of the driven roller 5 is taken as the y axis, the vertex of the end part of the roller body of the driven roller 5 is taken as the origin, and the convexity curve equation of the parabolic is y=delta-delta (2 x/L-1) 2 Wherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.
Example 1:
the roll surface length l=1450 mm, convexity 2δ=0.2 mm, roll shape curve of the driven roll 5 of the second intermediate roll of the sendzimir mill is parabolic, and the parabolic equation is y=0.1-0.1/725 2 *(x-725) 2 . Referring to fig. 4, compared with the arc roll shape, the contact stress peak of the first intermediate roll is reduced by about 10MPa, which is helpful for reducing the wear of the roll, prolonging the service life of the roll and improving the strip shape control capability of the rolling mill.
Example 2:
the roll surface length l=1550 mm, convexity 2δ=0.2 mm of the driven roll 5 of the second intermediate roll of the sendzimir mill, the roll profile curve is parabolic, and the parabolic equation is y=0.1-0.1/775 2 *(x-775) 2 . Compared with the arc roller shape, the contact stress peak of the first intermediate roller is reduced by about 12MPa, which is beneficial to reducing roller abrasion, prolonging the service life of the roller and improving the plate shape control capability of the rolling mill.
Referring to fig. 2 and 3, a second intermediate roller of a sendzimir mill has a roller shape of an elliptic curve of the roller shape of the driven roller 5, the axis of the driven roller 5 is the x-axis, the radial direction of the driven roller 5 is the y-axis, the apex of the end of the roller body of the driven roller 5 is the origin, and the convexity curve equation of the elliptic curve is as followsWherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.
Example 3:
the length l=1450 mm, convexity 2δ=0.2 mm, roll profile curve is elliptic curve with y=0.1×sqrt (1- ((x-725)/725) 2 ). Compared with the arc roller shape, the contact stress peak of the first intermediate roller is reduced by about 50MPa, which is beneficial to reducing roller abrasion, prolonging the service life of the roller and improving the plate shape control capability of the rolling mill.
Example 4:
the length l=1550 mm, convexity 2δ=0.15 mm, roll profile curve of the driven roller 5 of the second intermediate roll of the sendzimir mill is an elliptic curve with y=0.075 sqrt (1- ((x-775)/775) 2 ). Compared with the arc roller shape, the contact stress peak of the first intermediate roller is reduced by about 60MPa, which is beneficial to reducing roller abrasion, prolonging the service life of the roller and improving the plate shape control capability of the rolling mill.
Referring to fig. 2 and 3, a second intermediate roll of the sendzimir mill has a roll shape of a driven roll 5 with a four-time curve, an axis of the driven roll 5 is an x-axis, a radial direction of the driven roll 5 is a y-axis, an apex of a roll body end of the driven roll 5 is an origin, and a convexity curve equation of the four-time curve is y=δ - δ (2 x/L-1) 4 Wherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.
Example 5:
the length l=1450 mm, convexity 2δ=0.2 mm, roll profile curve of the driven roll 5 of the second intermediate roll of the sendzimir mill is four-time curve, the four-time curve equation is y=0.1-0.1 ((x-725)/725) 4 . Compared with the arc roller shape, the contact stress peak of the first intermediate roller is reduced by about 80MPa, which is beneficial to reducing roller abrasion, prolonging the service life of the roller and improving the plate shape control capability of the rolling mill.
Example 6:
the length l=1550 mm, convexity 2δ=0.2 mm, roll profile curve of the driven roller 5 of the second intermediate roll of the sendzimir mill is four-time curve, the four-time curve equation is y=0.1-0.1 ((x-775)/775) 4 . Compared with the arc roller shape, the contact stress peak of the first intermediate roller is reduced by about 90MPa, which is beneficial to reducing roller abrasion, prolonging the service life of the roller and improving the plate shape control capability of the rolling mill.
In the sendzimir roll system, the end part of the first intermediate roll 3 generally adopts a two-section type linear chamfer structure so as to better realize plate shape adjustment of different bandwidths through axial 'play'. Thus, as can be seen from fig. 3, the contact stress between the second intermediate roll and the first intermediate roll 3 presents a "cat-ear" like stress spike at the roll end. The optimized roll curves (parabola, elliptic curve, quadric curve) have the characteristics of reduced curvature in the middle of the roll body, increased curvature on both sides, and the like compared with the original circular arc roll shape. Therefore, after the convexity form of the second intermediate roll of the sendzimir mill is optimized into a parabolic curve, an elliptic curve or a four-time curve from the circular arc-shaped roll form curve, as can be seen from fig. 4, the relatively concentrated contact stress in the middle of the surface of the roll body of the original driven circular arc-shaped second intermediate roll is dispersed and transferred to two sides of the roll body, so that the stress in the middle of the roll body is reduced, and the stress peaks at the end parts are also reduced, thereby enhancing the stress uniformity of the driven roll 5, reducing the contact stress of the roll body to different degrees, reducing the contact wear between the driven roll 5 and the adjacent roll, improving the retention performance of the original convexity of the second intermediate roll, and reducing the wear of the roll and improving the shape control capability of the sendzimir mill roll system.
The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model should be included in the scope of the present utility model.
Claims (1)
1. The driven roller of the second intermediate roller of the Sendzimir rolling mill is characterized in that: the roller shape of the driven roller (5) of the second intermediate roller is optimized into a one-section curve, so that the contact stress between the rollers is reduced, the convexity retention performance of the driven roller is improved, and the service life of the second intermediate roller is prolonged; the one-segment curve is parabolic, elliptic or quadric curve,
when the curve is parabolic, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the vertex of the end part of the roller body of the driven roller (5) is taken as the origin, and the convexity curve equation of the parabolic roller shape is y=delta-delta (2 x/L-1) 2 Wherein the intermediate convexity is 2δ, rollerThe surface length is L, and the value range of x is 0-L;
in the case of elliptic curve, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the top point of the roller body end part of the driven roller (5) is taken as the origin, and the convexity curve equation of the elliptic curve roller shape is taken asWherein, the middle convexity is 2 delta, the length of the roller surface is L, and the value range of x is 0-L;
in the case of four curves, the axis of the driven roller (5) is taken as the x axis, the radial direction of the driven roller (5) is taken as the y axis, the vertex of the end part of the roller body of the driven roller (5) is taken as the origin, and the convexity curve equation of the four-curve roller shape is y=delta-delta (2 x/L-1) 4 Wherein, the middle convexity is 2 delta, the length of the roll surface is L, and the value range of x is 0-L.
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