CN111570536A - Roller way heat-insulating cover with wire rod temperature homogenizing function and design method - Google Patents
Roller way heat-insulating cover with wire rod temperature homogenizing function and design method Download PDFInfo
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- CN111570536A CN111570536A CN202010300549.8A CN202010300549A CN111570536A CN 111570536 A CN111570536 A CN 111570536A CN 202010300549 A CN202010300549 A CN 202010300549A CN 111570536 A CN111570536 A CN 111570536A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 50
- 238000000265 homogenisation Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 abstract description 7
- 238000004364 calculation method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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Abstract
A roller way heat preservation cover with a wire rod temperature homogenization function and a design method belong to the technical field of wire rod production equipment and design methods and are used for carrying out temperature homogenization on a wire rod. The technical scheme is as follows: the inner wall of a top plate of the roller way heat-insulating cover is in the shape of two identical upper concave circular arcs, the two upper concave circular arcs are symmetrically connected on two sides of the central line of the roller way heat-insulating cover, the two upper concave circular arcs are respectively a part of two oval shapes, one focus of the two ovals is overlapped on the central line of the roller way heat-insulating cover, and the other focus is respectively positioned on the edge of a wire rod in the roller way heat-insulating cover. According to the invention, the high-temperature heat radiation at the lap joint point position of the edge part of the wire rod is utilized to heat the middle position of the wire rod, so that the temperatures of different positions of the wire rod are uniform, the generation of hard phase tissues at the middle position of the wire rod is reduced, and the difference of tensile strengths of different positions of the wire rod is reduced. The invention has scientific design, does not need external heat source, does not excessively reduce the speed of the roller way, reduces the investment and has obvious economic benefit.
Description
Technical Field
The invention relates to a roller way heat-insulating cover capable of homogenizing the temperature of a wire rod and a design method thereof, belonging to the technical field of wire rod production equipment and design methods.
Background
In the production process of wire rods, reducing the temperature difference between the edge lap joint point and the middle part of the wire rod when the wire rod is cooled on a roller way after spinning is always the direction of effort of a high-speed wire rod factory for producing wire rod products needing slow cooling. Under conventional conditions, the arrangement at the overlapping points of the edge parts of the wire rod is dense, and the arrangement at the middle part of the wire rod is loose, so that the cooling speed and the cooling temperature at the overlapping points of the edge parts of the wire rod and the middle part of the wire rod have obvious difference in the cooling process. The difference in temperature between the two locations of the wire rod directly results in a difference in the phase change structure. Particularly, in the middle of the wire rod, the wire rod is loose in arrangement and fast in cooling, so that hard phase structures such as bainite and martensite are easy to appear, and the phenomena of wire drawing breakage and the like occur in the drawing process of a downstream user.
In order to solve the problem of uneven temperature of the lap joint point at the edge of the wire rod and the middle of the wire rod, the direct technical means is to reduce the speed of a roller way, so that the wire rod is arranged more densely on the roller way after being spun, and the cooling speed of the middle of the wire rod is reduced. However, after the speed of the roller way is reduced, the weight of the wire rod on the roller way in unit length is greatly increased, higher requirements are put on the material of the roller way, the circuit of a roller way driving system and the capacity of a motor, the equipment investment is huge, and the roller way roller is easy to creep when bearing large stress for a long time at high temperature, so that the roller way is deformed and fails. And the manufacturer also adopts an external heat source heat supplementing method at the middle part of the wire rod, but the equipment investment and the energy consumption are large, which are not beneficial to reducing the production cost of the wire rod.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a roller way heat-insulating cover with a wire rod temperature homogenizing function and a design method, the roller way heat-insulating cover can reduce the temperature difference between the overlapping point of the edge of the wire rod and the middle part of the wire rod passing through the roller way heat-insulating cover, improve the nonuniformity of the wire rod tissue, finally reduce the difference of the same-circle tensile strength of the wire rod, meet the requirement of a user on the fluctuation range of the tensile strength of the wire rod, and is suitable for the production of wire rod products needing slow cooling in a high-speed wire rod workshop.
The technical scheme for solving the technical problems is as follows:
the utility model provides a roll table heat preservation cover with wire rod temperature homogenization function, it includes roll table heat preservation cover, the heat preservation cover bracing piece, heat preservation cover switching mechanism, roll table heat preservation cover covers in the roll table top, one end of heat preservation cover bracing piece is connected in one side of roll table heat preservation cover, the other end of heat preservation cover bracing piece is connected with heat preservation cover switching mechanism, the roof inner wall shape of roll table heat preservation cover is two the same concave arc shapes, the circular arc bending direction of two concave arc shapes is perpendicular with the traffic direction of roll table, two concave arc shapes are in the central line bilateral symmetry connection of roll table heat preservation cover, two concave arc shapes are two oval shape partly respectively, a focus of two ellipses overlaps on the central line of roll table heat preservation cover, another focus of two ellipses is located the limit portion of the wire rod in the heat preservation cover respectively.
Above-mentioned roll table heat preservation cover with wire rod temperature homogenization function, roll table heat preservation cover's roof inner wall surface is smooth mirror surface.
A design method of the roller way heat-insulating cover with the wire rod temperature homogenizing function comprises the following steps:
a. establishing a coordinate system: taking horizontal lines from the upper plane of the roller way to two ends of the roller way heat-insulating cover as a straight line of an x axis of a coordinate system, taking one point of the center of the roller way heat-insulating cover positioned on the straight line of the x axis as an origin of a coordinate axis, taking a straight line on the right side of the origin of the coordinate axis as the x axis, and taking a straight line vertically upwards from the origin of the coordinate axis as a y axis of the coordinate system;
b. determining parameters: the coil diameter of the wire rod is D, the width of a wire rod cooling roller way is W, and the vertical height from the roller way to the lower surface of a roller way heat-insulating cover top plate is H;
c. an ellipse equation is established: because two the same last concave circular arcs of roll table heat preservation cover roof are partly of two oval shapes respectively, a focus of two ellipses overlaps on the central line of roll table heat preservation cover, and another focus of two ellipses is located the both sides in the roll table heat preservation cover respectively, consequently the ellipse equation in the central line both sides of roll table heat preservation cover is the same, because of the x axle of the coordinate system of setting for on the right side of the central line of roll table heat preservation cover, then the ellipse equation on the central line right side of roll table heat preservation cover is:
wherein x and y are respectively horizontal and vertical coordinate parameters, and a and b are parameters in an elliptic equation;
d. calculating an ellipse equation, drawing an ellipse shape, and according to the set W, H parameter, passing the ellipse equation through (
H), so the equation can become:
according to the geometric properties of the ellipse, a2-b2=
2Therefore, the values of a and b can be solved for the following system of equations:
wherein W, H and D are known numbers, and a and b values can be obtained, namely an oval shape can be drawn;
e. after the ellipse is drawn, the ellipse is cut at 0,W]and y is>The part 0 can be used as an upper concave arc shape of the lower surface of a top plate on the right side of the roller way heat-insulating cover;
f. the upper concave arc shape of the lower surface of the top plate on the left side of the roller way heat-insulating cover is the same as the upper concave arc shape of the lower surface of the top plate on the right side of the roller way heat-insulating cover, and the upper concave arc shape and the lower concave arc shape are symmetrical on two sides of the central line of the roller way heat-insulating cover.
The invention has the beneficial effects that:
the invention utilizes the special optical property of the ellipse, namely, after the light emitted from one focus of the ellipse is reflected by the ellipse, the reflected light is crossed on the other focus of the ellipse, so that one focus of the ellipse is arranged at the edge part of the wire rod, the other focus is arranged at the middle part of the wire rod, the heat radiation at the edge part of the wire rod can be converged to the middle part of the wire rod through the reflection of the ellipse, the middle part of the wire rod is effectively heated, and the purpose of homogenizing the temperature of the wire rod is achieved.
The invention is the pioneer of the roller way heat-insulating cover, realizes the heating of the middle position of a wire rod by utilizing high-temperature heat radiation at the position of a lap joint point of the edge part of the wire rod by redesigning the shape of the inner layer of the roller way heat-insulating cover of a wire rod cooling line of a high-speed wire rod factory, evens the temperature of different positions of the wire rod, reduces the generation of hard phase tissues at the middle position of the wire rod and reduces the difference of tensile strengths of different positions of the wire rod. The invention has scientific design and simple manufacture, does not need an external heat source to supplement heat to the middle position of the wire rod, does not need to excessively reduce the speed of the roller way, avoids the investment of the reconstruction of the equipment such as the roller way and the like, and has obvious economic benefit.
Drawings
FIG. 1 is a schematic structural view of a roller way heat-insulating cover of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a top plan view of the coil placement of FIG. 1;
FIG. 4 is a schematic diagram of the establishment and calculation of an ellipse equation of the roller way heat-insulating cover;
FIG. 5 is a schematic view showing a calculated elliptical shape of the roller way insulating cover according to example 1;
FIG. 6 is a schematic view showing a calculated elliptical shape of the roller way insulating cover according to example 2;
fig. 7 is a schematic view showing the calculated elliptical shape of the roller way heat-insulating cover in example 3.
The figures are labeled as follows: the device comprises a roller way transmission mechanism protection cover 1, a roller way heat preservation cover 2, a heat preservation cover support rod 3, a heat preservation cover opening and closing mechanism 4, a roller way 5, a wire rod 6, a fan 7, a roller way transmission mechanism 8, an upper concave arc 9, a right ellipse 10, a right focus 11, a right incident ray 12, a right reflection ray 13, a middle focus 14, a left ellipse 15, a left focus 16, a left incident ray 17 and a left reflection ray 18.
Detailed Description
The design idea of the invention is to exchange the heat of the wire rod, heat the middle of the wire rod by using the heat at the edge of the wire rod, so as to achieve the homogenization of the temperature of the wire rod without adding a heating device. The theoretical basis is as follows:
first, an ellipse has special optical properties, i.e., light rays emitted from one focus of the ellipse are reflected by the ellipse, and the reflected light rays intersect at the other focus of the ellipse. Since heat radiation is also an electromagnetic wave, it can be reflected by a smooth surface as well as light. By utilizing the special optical property of the ellipse, the heat source and the heated object can be respectively placed on two focuses of the ellipse, so that the heat radiation of the heat source can be converged on the heated object through the reflection of the ellipse, and the heated object is effectively heated.
Secondly, for the production of the wire rod, the lap joint point of the edge part with higher temperature during cooling can be regarded as a heat source, and the middle part of the wire rod with lower temperature can be regarded as a heated object. By utilizing the position relation of the two parts, an ellipse equation with the two parts as a focus can be established, and then materials (such as 316 stainless steel and the like) with polished surfaces and oxidation resistance are manufactured into shapes described by the ellipse equation and used as the inner layer of the roller way heat preservation cover. Through the special shape and smooth surface of the oval inner layer, the heat radiation at the position of the lap joint point of the edge part is converged to the middle position of the wire rod, and the middle position of the wire rod is heated to realize the homogenization of the temperature of the wire rod.
Fig. 1, 2 and 3 show that the roller way heat-insulating cover comprises a roller way heat-insulating cover 2, a heat-insulating cover support 3 rod and a heat-insulating cover opening and closing mechanism 4, wherein the roller way heat-insulating cover 2 covers the roller way 5, one end of the heat-insulating cover support rod 3 is connected to one side of the roller way heat-insulating cover 2, and the other end of the heat-insulating cover support rod 3 is connected with the heat-insulating cover opening and closing mechanism 4.
Fig. 1 and 2 show that the inner wall of the roller way heat-insulating cover top plate is in the shape of two identical upper concave circular arcs 9, the circular arc bending directions of the two upper concave circular arcs 9 are perpendicular to the running direction of the roller way 5, and the two upper concave circular arcs 9 are symmetrically connected on two sides of the central line of the roller way heat-insulating cover 2.
Fig. 1 and 2 show that the inner wall surface of the top plate of the roller way heat-insulating cover 2 is a smooth mirror surface, and the surface of the roller way heat-insulating cover is made of polished and oxidation-resistant materials (such as 316 stainless steel) to form an upper concave arc 9 shape, so that heat radiation at the lap joint position of the edge part of the wire rod 6 is reflected and converged to the middle part of the wire rod 6.
Fig. 4 shows that two upper concave circular arcs 9 of the roller way heat-insulating cover 2 are respectively a part of a right ellipse 10 and a left ellipse 15, the intermediate focus 14 of the right ellipse 10 and the left ellipse 15 is overlapped on the central line of the roller way heat-insulating cover, and the right focus 11 of the right ellipse 10 and the left focus 16 of the left ellipse 15 are respectively positioned at the edge of the wire rod 6 in the roller way heat-insulating cover 2. The heat on the right side of the wire rod 6 reaches the right focus 11 through the right incident ray 12, and then passes through the middle part of the wire rod 6 at the middle focus 14 reflected by the right reflection ray 13; similarly, the heat from the left side of the wire rod 6 reaches the left focus 16 through the left incident ray 17, and then heats the middle of the wire rod 6 through the middle of the wire rod 6 at the middle focus 14 reflected by the left reflected ray 18.
Fig. 4 shows that the calculation method of the right ellipse 10 and the left ellipse 15 corresponding to the two upper concave arc shapes 9 of the roller way heat-insulating cover 2 comprises the following steps:
a. establishing a coordinate system: taking horizontal lines from the upper plane of the roller way to two ends of the roller way heat-insulating cover 2 as a straight line of an x axis of a coordinate system, taking one point of the center of the roller way heat-insulating cover positioned on the straight line of the x axis as an origin of a coordinate axis, taking a straight line on the right side of the origin of the coordinate axis as the x axis, and taking a straight line vertically upwards from the origin of the coordinate axis as a y axis of the coordinate system;
b. determining parameters: the coil diameter of the wire rod is D, the width of a wire rod cooling roller way is W, and the vertical height from the roller way to the lower surface of a roller way heat-insulating cover top plate is H;
c. an ellipse equation is established: because two the same last concave circular arcs of roll table heat preservation cover roof are partly of two oval shapes respectively, a focus of two ellipses overlaps on the central line of roll table heat preservation cover, and another focus of two ellipses is located the both sides in the roll table heat preservation cover respectively, consequently the ellipse equation at roll table heat preservation cover central line both sides is the same, because of the x axle of the coordinate system of setting for on the right side of roll table heat preservation cover central line, then the ellipse equation on roll table heat preservation cover central line right side is:
wherein x and y are respectively horizontal and vertical coordinate parameters, and a and b are parameters in an elliptic equation;
d. calculating an ellipse equation, drawing an ellipse shape, and according to the set W, H parameter, passing the ellipse equation through (
H), so the equation can become:
according to the geometric properties of the ellipse, a2-b2=
2Therefore, the values of a and b can be solved for the following system of equations:
wherein W, H and D are known numbers, and a and b values can be obtained, namely an oval shape can be drawn;
e. after the ellipse is drawn, the ellipse is cut at 0,W]and y is>The part 0 can be used as an upper concave arc 9 on the lower surface of the top plate on the right side of the roller way heat-insulating cover 2;
f. the upper concave arc shape 9 of the lower surface of the top plate on the left side of the roller way heat-insulating cover 2 is the same as the upper concave arc shape 9 of the lower surface of the top plate on the right side of the roller way heat-insulating cover 2, and the two sides of the central line of the roller way heat-insulating cover 2 are symmetrical.
Fig. 5 to 7 show the calculation results of the shapes of the inner layers of the roller way heat-insulating covers 2 of the embodiments 1, 2 and 3, wherein the dotted lines are the calculated ellipse equations arranged according to the positions of the wire rods 6, because the widths of the roller way 5 and the roller way heat-insulating cover 2 are limited, the shape of the upper concave arc 9 of the actual roller way heat-insulating cover 2 is given by a thickened line, and the middle transverse line shows the positions of the wire rods 6.
Example 1
The diameter of a coil of a certain plant of wire rods 6 is 1075mm, the width of a wire rod cooling roller way 5 is 1500mm, and the vertical height from the roller way 5 to the edge of the roller way heat preservation cover 2 is 700 mm. By using the data, the right-side ellipse equation which needs to be satisfied by the shape of the roller way heat-insulating cover 2 can be calculated as follows:
considering that the wire rod 6 and the roller way 5 are symmetrical about the central line, the shape of the upper concave arc 9 of the roller way heat preservation cover 2 is calculated and shown in figure 5.
Example 2
The circle diameter of a certain plant coil 6 is 1034mm, the width of the coil cooling roller way 5 is 1450mm, and the vertical height from the roller way 5 to the edge of the roller way heat-insulating cover 2 is 450 mm. By using the data, the right-side ellipse equation which needs to be satisfied by the shape of the roller way heat-insulating cover 2 can be calculated as follows:
considering that the wire rod 6 and the roller way 5 are symmetrical about the central line, the shape of the upper concave arc 9 of the roller way heat preservation cover 2 is calculated as shown in fig. 6.
Example 3
The circle diameter of a certain plant of wire rods 6 is 1050mm, the width of a wire rod cooling roller way 5 is 1500mm, and the vertical height from the roller way 5 to the edge of the roller way heat-insulating cover 2 is 600 mm. By using the data, the right-side ellipse equation which needs to be satisfied by the shape of the roller way heat-insulating cover 2 can be calculated as follows:
considering that the wire rod 6 and the roller way 5 are symmetrical about the central line, the shape of the upper concave arc 9 of the roller way heat-insulating cover 2 is calculated as shown in fig. 7.
Claims (3)
1. The utility model provides a roll table heat preservation cover with wire rod temperature homogenization function, it includes roll table heat preservation cover (2), heat preservation cover bracing piece (3), heat preservation cover closing mechanism (4), roll table heat preservation cover (2) cover in roll table (5) top, and the one end of heat preservation cover bracing piece (3) is connected in one side of roll table heat preservation cover (2), and the other end of heat preservation cover bracing piece (3) is connected with heat preservation cover closing mechanism (4), its characterized in that: the inner wall of a top plate of the roller way heat-insulating cover (2) is in the shape of two identical upper concave circular arcs (9), the circular arc bending direction of the two upper concave circular arcs (9) is perpendicular to the running direction of the roller way (5), the two upper concave circular arcs (9) are symmetrically connected with each other on two sides of the central line of the roller way heat-insulating cover (2), the two upper concave circular arcs (9) are respectively a part of two ellipses, one focus of each ellipse is overlapped on the central line of the roller way heat-insulating cover (2), and the other focus of each ellipse is respectively positioned on the edge of a wire rod (6) in the roller way heat-insulating cover (2).
2. The roller way heat-insulating cover with the wire rod temperature homogenizing function according to claim 1, characterized in that: the surface of the inner wall of the top plate of the roller way heat-insulating cover (2) is a smooth mirror surface.
3. A design method of the roller way heat-insulating cover with the wire rod temperature homogenization function is characterized in that: the method comprises the following steps:
a. establishing a coordinate system: taking horizontal lines from the upper plane of the roller way (5) to two ends of the roller way heat-insulating cover (2) as a straight line of an x axis of a coordinate system, taking one point of the center of the roller way heat-insulating cover positioned on the straight line of the x axis as an origin of a coordinate axis, taking a straight line on the right side of the origin of the coordinate axis as the x axis, and taking a straight line vertically upwards from the origin of the coordinate axis as a y axis of the coordinate system;
b. determining parameters: the diameter of the coil rod (6) is D, the width of the coil rod cooling roller way (5) is W, and the vertical height from the roller way (5) to the lower surface of the roller way heat-insulating cover top plate is H;
c. an ellipse equation is established: because two the same concave arc shape (9) on the roll table heat preservation cover roof are partly of two oval shapes respectively, a focus of two ellipses overlaps on the central line of roll table heat preservation cover (2), another focus of two ellipses is located the both sides in roll table heat preservation cover (2) respectively, consequently the ellipse equation in the central line both sides of roll table heat preservation cover (2) is the same, because of the x axle of the coordinate system of setting is on the right side of the central line of roll table heat preservation cover (2), then the ellipse equation on the central line right side of roll table heat preservation cover (2) is:
wherein x and y are respectively horizontal and vertical coordinate parameters, and a and b are parameters in an elliptic equation;
d. calculating an ellipse equation, drawing an ellipse shape, and according to the set W, H parameter, passing the ellipse equation through (
H), so the equation can become:
according to the geometric properties of the ellipse, a2-b2=
2Therefore, the values of a and b can be solved for the following system of equations:
wherein W, H and D are known numbers, and a and b values can be obtained, namely an oval shape can be drawn;
e. after the ellipse is drawn, the ellipse is cut at 0,W]and y is>The part 0 can be used as an upper concave arc (9) of the lower surface of the top plate on the right side of the roller way heat-insulating cover (2);
f. the upper concave arc shape (9) of the lower surface of the top plate on the left side of the roller way heat-insulating cover (2) is the same as the upper concave arc shape (9) of the lower surface of the top plate on the right side of the roller way heat-insulating cover (2), and the upper concave arc shape are symmetrical on two sides of the central line of the roller way heat-insulating cover (2).
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| CN107159723A (en) * | 2017-06-06 | 2017-09-15 | 上海大学 | Stelmor air cooling line side wall pressure wind apparatus |
| CN110814080A (en) * | 2019-11-12 | 2020-02-21 | 张家港荣盛特钢有限公司 | PF line heat preservation device and method for improving scale peeling performance |
| CN212525450U (en) * | 2020-04-16 | 2021-02-12 | 河钢股份有限公司 | Roller way heat preservation cover with wire rod temperature homogenization function |
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