Single-tooth track plate cogging pass and hot rolling method

Abstract

The present invention provides a single-tooth track plate cogging pass and a hot rolling method, which includes a first cogging hole and a second cogging hole, the first cogging hole being formed by a first top roll and a first bottom roll of a blooming mill, and the second cogging hole being formed by a second top roll and a second bottom roll of the blooming mill, the first cogging hole being a front hole and used for pressing a rectangular continuous casting base material into an angle-shaped intermediate slab including a right bend foot, a first center pillar, and a left bend foot, and the second cogging hole being a rear hole and used for pressing the angle-shaped intermediate slab into an inverted T-shaped intermediate slab including a right flat foot, a second center pillar, and a left flat foot. The present invention significantly reduces the dependency on the dimensions of the base material, making it possible to produce large-specification single-tooth track plates with a small base material, resulting in excellent energy savings. The unique design of the first cogging hole and second cogging hole eliminates deficiencies such as low efficiency, poor safety, and poor dimensional accuracy due to the instability of the base material, thereby realizing the efficient production of single-tooth track plates.

Description

[Technical Field]

[0001] The present invention relates to the field of steel section production technology, and more particularly to a single-tooth track plate cogging pass and a hot rolling method. [Background technology]

[0002] Tracks are commonly used running parts for construction machinery. Compared to tires, tracks can be adapted to various harsh working environments and have advantages such as wear resistance and impact resistance. Track plates are essential metallurgical products for producing tracks, and various forming methods are available, such as casting, press forming, machining, and roll forming. Roll forming methods are increasingly being used due to their higher efficiency, lower cost, and superior overall performance compared to casting, press, and machining. However, due to the complex and asymmetric cross-sectional shape of track plates, it is difficult to control the deformation of rolled materials during cogging rolling, which easily leads to bending, twisting, reverse steel, and steel buildup, making automated production difficult. For this reason, track plates, especially single-tooth track plates with high asymmetry, must be produced using artificial auxiliary rolling materials, which significantly increases the risk of personal injury accidents.

[0003] Chinese Patent CN201310393973.1 discloses a semi-open, semi-closed blank die for a single-tooth track plate and a forging method for a single-tooth track plate. The objectives of the patent are to provide a semi-open, semi-closed blank die for a single-tooth track plate that can be used to produce a single-tooth track plate preform and that easily produces a forged material, and a forging method for a single-tooth track plate that can be used to forge a single-tooth track plate using a forging process. Producing track plates using this forging method has low yield and high cost.

[0004] The paper "Finite Element Simulation of Track Steel Rolling," published in July 2009, Vol. 30, Issue 3 of "Iron and Vanadium Titanium," concerns the track steel rolling process. The complex cross-sectional shape of single-tooth track steel makes it susceptible to twisting, warping, and lateral bending during rolling, which affect the rolling process. To address the serious problem of twisting during deep-hole rolling of track steel, the pass parameters were optimized, reducing the twist angle during deep-hole rolling of track steel from 135.6° to 13.85°, satisfying the normal penetration requirements of subsequent passes and ensuring smooth production. In addition to the serious twisting problem present in the six-hole rolling process described in this paper, the one-hole, two-hole, and three-hole rolling processes also feature three additional box-shaped holes to reduce the material, thereby increasing the rolling roll length and passes, resulting in low production efficiency and high energy consumption. In addition, the support condition at the bottom of the rolled material is unstable in all four-hole, five-hole, and eight-hole rolled methods, which makes it easy for the material to tilt or tip over after being turned over, resulting in protrusion problems that affect subsequent rolling. This makes it difficult to control dimensional accuracy and requires artificial auxiliary rolling material penetration, which is unfavorable for improving production rhythm and controlling safety risks. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a single-tooth track plate cogging path and a hot rolling method that can obtain a good intermediate slab shape, stabilize support for the base material bottom, prevent tilting or tipping after steel is turned over, and achieve efficient hot rolling production of single-tooth track plates without requiring artificial assistance. [Means for solving the problem]

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The single-tooth track plate cogging pass has a first cogging hole and a second cogging hole, the first cogging hole consisting of the first top roll and first bottom roll of a blooming mill, and the second cogging hole consisting of the second top roll and second bottom roll of a blooming mill, and the first cogging hole is a front hole used to press a rectangular continuous casting base into a mountain-shaped intermediate slab including a right bend foot, a first center post, and a left bend foot, and the second cogging hole is a rear hole used to press the mountain-shaped intermediate slab into an inverted T-shaped intermediate slab including a right flat foot, a second center post, and a left flat foot.

[0008] Furthermore, in the above-described single-tooth track plate cogging path, the lower surface of the first upper roll includes a first inclined surface, a first flat surface, a second inclined surface, a second flat surface, a third inclined surface, a third flat surface, and a fourth inclined surface, the first inclined surface, the first flat surface, the second inclined surface, the second flat surface, the third inclined surface, the third flat surface, and the fourth inclined surface are sequentially connected, the first flat surface and the third flat surface are located on the same horizontal plane, the first inclined surface, the second inclined surface, the third inclined surface, and the fourth inclined surface are each located above the first flat surface, the second flat surface is parallel to the first flat surface, and the second inclined surface, the second flat surface, and the third inclined surface form a trapezoidal groove on the lower surface of the first upper roll.

[0009] Furthermore, in the above-mentioned single-tooth crawler plate cogging path, the angle α formed between the first inclined surface and the first plane is 30° to 70°, the angle β formed between the second inclined surface and the first plane is 65° to 88°, the angle γ formed between the third inclined surface and the third plane is 65° to 88°, and the angle δ formed between the fourth inclined surface and the third plane is 30° to 70°, and preferably, the angles between the second inclined surface and the second plane and the second plane and the third inclined surface are each an arc of a radius of 10 mm to 30 mm. and between the first inclined surface and the first plane, between the first plane and the second inclined surface, between the third inclined surface and the third plane, and between the third plane and the fourth inclined surface, there is a smooth transition via a circular arc with a radius of 25 mm to 60 mm, respectively. Preferably, the length of the first inclined surface is B1, the vertical distance between the second plane and the first plane is H1, B1:H1=0.7 to 2:1, and the length of the fourth inclined surface is B2, B2:H1=0.5 to 1.2:1.

[0010] Furthermore, in the above-described single-tooth track plate cogging path, the upper surface of the first lower roller includes a fifth inclined surface, a fourth flat surface, and a sixth inclined surface, the fifth inclined surface, the fourth flat surface, and the sixth inclined surface are sequentially connected, and the fifth inclined surface and the sixth inclined surface are each located above the fourth flat surface, preferably, the angle ε between the fifth inclined surface and the fourth flat surface is 50° to 88°, and the angle ζ between the fourth flat surface and the sixth inclined surface is 50° to 88°, and preferably, there is a smooth transition between the fifth inclined surface and the fourth flat surface, and between the fourth flat surface and the sixth inclined surface, each via an arc with a radius of 25 mm to 60 mm.

[0011] Furthermore, in the above-described single-tooth track plate cogging path, the lower surface of the second upper roll includes a seventh inclined surface, an eighth inclined surface, a ninth inclined surface, a fifth plane, a tenth inclined surface, an eleventh inclined surface, and a twelfth inclined surface, the seventh inclined surface, the eighth inclined surface, the ninth inclined surface, the fifth plane, the tenth inclined surface, the eleventh inclined surface, and the twelfth inclined surface are connected in sequence, the fifth plane is provided horizontally, the lower ends of the seventh inclined surface and the twelfth inclined surface are located on the same horizontal plane, the eighth inclined surface and the eleventh inclined surface are located above the twelfth inclined surface, the ninth inclined surface and the tenth inclined surface are located above the eleventh inclined surface, and the ninth inclined surface, the fifth plane, and the tenth inclined surface form a trapezoidal groove in the lower surface of the second upper roller.

[0012] Furthermore, in the above-mentioned single-tooth crawler plate cogging path, the angle η formed between the seventh inclined surface and the horizontal plane is 60° to 88°, the angle θ formed between the eighth inclined surface and the horizontal plane is 0° to 30°, the angle ι formed between the ninth inclined surface and the fifth plane is 70° to 88°, the angle κ formed between the tenth inclined surface and the fifth plane is 70° to 88°, the angle λ formed between the eleventh inclined surface and the horizontal plane is 0° to 30°, and the angle λ formed between the twelfth inclined surface and The angle μ with respect to the horizontal plane is 60° to 88°, and preferably, there is a smooth transition between the seventh and eighth inclined planes, between the ninth and fifth inclined planes, between the fifth and tenth inclined planes, and between the eleventh and twelfth inclined planes via arcs with radii of 10 mm to 30 mm, and there is a smooth transition between the eighth and ninth inclined planes, and between the tenth and eleventh inclined planes via arcs with radii of 50 mm to 80 mm.

[0013] Furthermore, in the above-mentioned single-tooth track plate cogging path, the upper surface of the second lower roll includes a sixth plane, an arc segment, and a seventh plane, the sixth plane, the arc segment, and the seventh plane are connected in sequence, the sixth plane and the seventh plane are located on the same horizontal plane, the arc segment is located above the sixth plane, the radius of the arc segment is 50 mm to 120 mm, and the length of the arc segment is 80 mm to 200 mm.

[0014] Furthermore, in the above single-tooth crawler plate cogging path, the length of the right flat foot is B3, the vertical distance between the fifth plane and the sixth plane is H2, B3:H2=1 to 2:1, and the length of the left flat foot is B4, B4:H2=0.6 to 1.2:1.

[0015] Furthermore, in the above-mentioned single-tooth track plate cogging pass, the width of the continuous casting base is equal to or greater than the width W1 of the fourth plane on the upper surface of the first lower roll, the width of the continuous casting base is equal to or less than the width W2 of the first cogging hole, and the height-to-width ratio of the continuous casting base is 0.7 to 1.3.

[0016] On the other hand, there is provided a hot rolling method for a single-tooth track plate using the above-mentioned single-tooth track plate cogging pass,

[0017] Step 1: cogging a rectangular continuous cast blank in a blooming mill, sequentially rolling the continuous cast blank through one to four first cogging holes, gradually rolling the continuous cast blank into a right bend foot, a first center post, and a left bend foot, the first inclined surface and the first flat surface align with the fifth inclined surface and the fourth flat surface to form the right bend foot, the second inclined surface, the second flat surface, and the third inclined surface align with the fourth flat surface to form the first center post, and the third flat surface and the fourth inclined surface align with the fourth flat surface to form the left bend foot, so that the cross section of the continuous cast blank changes from rectangular to a mountain-shaped cross section, thereby obtaining a mountain-shaped intermediate slab;

[0018] Step 2: The mountain-shaped intermediate slab obtained in step 1 is further cogging-rolled in a blooming mill, and the mountain-shaped intermediate slab is rolled through one to four second cogging holes; the seventh and eighth slopes gradually crush and thin the right bent foot of the mountain-shaped intermediate slab in accordance with the sixth plane to form a right flat foot; the ninth, fifth, and tenth slopes gradually thin and elevate the first center pillar in accordance with the arc segment to form a second center pillar; the fourth plane is extruded into an arc segment; the eleventh and twelfth slopes gradually crush and thin the left bent foot in accordance with the seventh plane to form a left flat foot; and the cross section of the mountain-shaped intermediate slab is changed from mountain-shaped to inverted T-shaped, thereby obtaining an inverted T-shaped intermediate slab;

[0019] Step 3: rough rolling the inverted T-shaped intermediate slab obtained by cogging in the first cogging hole and the second cogging hole to reduce the thickness of the base material and increase the width of the base material;

[0020] and step 4 of finish-rolling the raw material after rough rolling in step 3, precision-forming each portion of the raw material corresponding to the main plate, side wing, and tooth plate of the single-tooth track plate to manufacture the single-tooth track plate, and rolling the right flat foot into the main plate of the single-tooth track plate, rolling the second center post into the side wing of the single-tooth track plate, and rolling the left flat foot into the tooth plate of the single-tooth track plate. [Effects of the Invention]

[0021] Analysis reveals that the present invention discloses a cogging path and hot rolling method for single-tooth track plates, in which a rectangular continuous cast blank is cogging-rolled in the first and second cogging holes of a blooming mill, and the cogging blank is then subjected to rough rolling and finish rolling to produce single-tooth track plates. The present invention significantly reduces the dependency on blank dimensions, allowing large-specification single-tooth track plates to be produced from small blanks, with excellent energy-saving effects. The unique design of the first and second cogging holes overcomes shortcomings such as low efficiency, poor safety, and poor dimensional accuracy caused by unstable blanks, thereby realizing the efficient production of single-tooth track plates. [Brief explanation of the drawings]

[0022] The specification and drawings forming a part of this application are intended to provide a further understanding of the present invention, and the schematic examples of the present invention and their descriptions are intended to illustrate the present invention and are not to be construed as unduly limiting the present invention. [Figure 1] 3 is a structural schematic diagram of a first cogging hole according to an embodiment of the present invention; FIG. [Figure 2] FIG. 4 is a structural schematic diagram of a second cogging hole according to an embodiment of the present invention. [Figure 3] 1 is a schematic view showing the structure of a single-tooth crawler track plate according to one embodiment of the present invention. [Figure 4] FIG. 4 is another structural schematic diagram of a first cogging hole according to an embodiment of the present invention. [Figure 5]FIG. 10 is another structural schematic diagram of a second cogging hole according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Each embodiment is provided by way of explanation of the present invention and is not intended to limit the present invention. In fact, those skilled in the art will readily recognize that modifications and variations of the present invention are possible without departing from the scope or spirit of the present invention. For example, some features of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations within the scope of the appended claims and their equivalents.

[0024] In describing the present invention, the orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "ceiling," and "bottom" are based on the orientations or positional relationships shown in the drawings and are intended to facilitate the description of the present invention. They do not require the present invention to be configured or operated in a specific orientation, and should not be understood as limiting the present invention. The terms "connect," "connected," and "installed" used in the present invention should be understood broadly, and may refer to, for example, a fixed connection, a detachable connection, a direct connection, or an indirect connection via an intermediate member. Those skilled in the art will be able to understand the specific meanings of the above terms depending on the specific situation.

[0025] The accompanying drawings illustrate one or more embodiments of the present invention. The detailed description refers to features in the drawings with numerical and alphabetical symbols. Like or similar reference numerals in the drawings and description refer to like or similar parts of the present invention. As used herein, the terms "first," "second," "third," etc. are used interchangeably to distinguish one element from another and do not denote the location or importance of other elements.

[0026] As shown in Figures 1 to 5, according to an embodiment of the present invention, as shown in Figure 3, the single-tooth track plate 5 includes a main plate 51, a tooth plate 52, and a side wing 53, one end of the side wing 53 is connected to one end of the main plate 51, the other end of the side wing 53 extends in a direction away from the main plate 51, and one end of the tooth plate 52 is connected to the underside of the main plate 51, providing a single-tooth track plate cogging path.

[0027] This cogging path includes a first cogging hole 1 and a second cogging hole 3, where the first cogging hole 1 consists of the first upper roll and the first lower roll of the blooming mill, and the second cogging hole 3 consists of the second upper roll and the second lower roll of the blooming mill. The first cogging hole 1 is a front hole used to press the rectangular continuous casting base material into a mountain-shaped intermediate slab including a right bend foot 11, a first center pillar 12, and a left bend foot 13, and the second cogging hole 3 is a rear hole used to press the mountain-shaped intermediate slab into an inverted T-shaped intermediate slab including a right flat foot 31, a second center pillar 32, and a left flat foot 33. In the process of rolling the single-tooth track plate 5 through the first cogging hole 1 and the second cogging hole 3 of the blooming mill, shortcomings such as low efficiency, poor safety, and poor dimensional accuracy due to instability of the base material are eliminated, thereby realizing efficient production of the single-tooth track plate 5.

[0028] Furthermore, as shown in FIG. 1 , the lower surface of the first upper roll includes a first inclined surface 14, a first flat surface 15, a second inclined surface 16, a second flat surface 17, a third inclined surface 18, a third flat surface 19, and a fourth inclined surface 20, and the first inclined surface 14, the first flat surface 15, the second inclined surface 16, the second flat surface 17, the third inclined surface 18, the third flat surface 19, and the fourth inclined surface 20 are connected in sequence, the first flat surface 15 and the third flat surface 19 are located on the same horizontal plane, the first inclined surface 14, the second inclined surface 16, the third inclined surface 18, and the fourth inclined surface 20 are located above the first flat surface 15, and the second flat surface 17 is parallel to the first flat surface 15, and the second inclined surface 16, the second flat surface 17, and the third inclined surface 18 form a trapezoidal groove on the lower surface of the first upper roll. The upper surface of the first lower roller includes a fifth inclined surface 21, a fourth plane 22, and a sixth inclined surface 23, and the fifth inclined surface 21, the fourth plane 22, and the sixth inclined surface 23 are connected in sequence, and the fifth inclined surface 21 and the sixth inclined surface 23 are each located above the fourth plane 22.

[0029] The first inclined surface 14 and the first flat surface 15 match with the fifth inclined surface 21 and the fourth flat surface 22 to form the right bend foot 11 of the first cogging hole 1; the second inclined surface 16, the second flat surface 17 and the third inclined surface 18 match with the fourth flat surface 22 to form the first center post 12 of the first cogging hole 1; the third flat surface 19 and the fourth inclined surface 20 match with the fourth flat surface 22 and the sixth inclined surface 23 to form the left bend foot 13 of the first cogging hole 1; the right bend foot 11 and the left bend foot 13 each have a curved structure. The curved design of the right bend foot 11 and the left bend foot 13 can maximize the width and height of each portion of the blank corresponding to the main plate 51, the tooth plate 52 and the side wing 53 of the single-tooth track plate 5, so that the single-tooth track plate 5 can be rolled using a small blank, with fewer rolling passes and fewer passes, resulting in high production efficiency and low energy consumption, which is in line with the national green and low-carbon industry policy. The fifth inclined surface 21, the fourth flat surface 22, and the sixth inclined surface 23 combine to form a grooved structure at the bottom of the first cogging hole 1, allowing the first upper roll and the first lower roll of the blooming mill to stably clamp the blank, stabilizing the support state at the bottom of the blank and achieving stable rolling. This in turn enables control of the blank's dimensional accuracy, effectively reducing the degree of twisting and bending of the blank during rolling, and preventing the blank from tilting or tipping over, which would affect the subsequent rolling. This eliminates the need for artificial assistance to dig into the rolled material, effectively improving production rhythm and reducing safety risks.

[0030] Furthermore, as shown in Figure 4, the angle α between the first inclined surface 14 and the first plane 15 is 30° to 70° (for example, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°), and the design of the inclination angle of the first inclined surface 14 stabilizes the rolling of the raw material through the first cogging hole 1 and can supply raw material of an appropriate length to the right flat foot 31 of the second cogging hole 3, preventing metal shortages or excesses. The angle β between the second inclined surface 16 and the first flat surface 15 is 65° to 88° (for example, 65°, 67°, 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°), and the angle γ between the third inclined surface 18 and the third flat surface 19 is 65° to 88° (for example, 65°, 67°, 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°). The angle δ between the fourth inclined surface 20 and the third plane 19 is 30° to 70° (for example, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°), and the design of the inclination angle of the fourth inclined surface 20 stabilizes the rolling of the raw material through the first cogging hole 1 and can supply raw material of an appropriate length to the left flat foot 33 of the second cogging hole 3, preventing metal shortages or excesses. The angle ε between the fifth inclined surface 21 and the fourth plane 22 is 50° to 88° (e.g., 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 88°), and the angle ζ between the fourth plane 22 and the sixth inclined surface 23 is 50° to 88° (e.g., 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 88°), and in one embodiment of the present invention, α is 45°, β is 75°, γ is 75°, δ is 45°, ε is 62°, and ζ is 62°.

[0031] The transition between the second inclined surface 16 and the second flat surface 17, and the transition between the second flat surface 17 and the third inclined surface 18, respectively, are made via appropriate arcs. Preferably, the transition between the second inclined surface 16 and the second flat surface 17, and the transition between the second flat surface 17 and the third inclined surface 18, respectively, are made via arcs with radii of 10 mm to 30 mm (for example, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm). The transitions between the first inclined surface 14 and the first flat surface 15, between the first flat surface 15 and the second inclined surface 16, between the third inclined surface 18 and the third flat surface 19, between the third flat surface 19 and the fourth inclined surface 20, between the fifth inclined surface 21 and the fourth flat surface 22, and between the fourth flat surface 22 and the sixth inclined surface 23 are each smooth via an arc with a radius of 25 mm to 60 mm (e.g., 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, or 60 mm). Setting the parameters described above allows the connection points of each base material to be uniformly deformed, reducing shear resistance. This also allows the first center post 12 to be elongated to the ideal height, ensuring satisfactory dimensional control of the side wings 53 of the completed single-tooth track plate 5.

[0032] Preferably, as shown in FIG. 4, the length of the first inclined surface 14 is B1, the vertical distance between the second flat surface 17 and the first flat surface 15 is H1, where B1:H1 = 0.7 to 2:1, and the length of the fourth inclined surface 20 is B2, where B2:H1 = 0.5 to 1.2:1. The inclination angle and length of the first inclined surface 14 are designed to stabilize the rolling of the blank through the first cogging hole 1 and to supply blanks of an appropriate length to the right flat foot 31 of the second cogging hole 3, preventing metal shortages and excesses. The inclination angle and length of the fourth inclined surface 20 are designed to stabilize the rolling of the blank through the first cogging hole 1 and to supply blanks of an appropriate length to the left flat foot 33 of the second cogging hole 3, preventing metal shortages and excesses.

[0033] Furthermore, as shown in FIG. 2 , the lower surface of the second upper roller includes a seventh inclined surface 34, an eighth inclined surface 35, a ninth inclined surface 36, a fifth flat surface 37, a tenth inclined surface 38, an eleventh inclined surface 39, and a twelfth inclined surface 40, and the seventh inclined surface 34, the eighth inclined surface 35, the ninth inclined surface 36, the fifth flat surface 37, the tenth inclined surface 38, the eleventh inclined surface 39, and the twelfth inclined surface 40 are connected in sequence, and the fifth flat surface The second upper roller has a sixth plane 41, an arc segment 42, and a seventh plane 43. The sixth plane 41, the arc segment 42, and the seventh plane 43 are connected in sequence. The sixth plane 41 and the arc segment 42 are located on the same horizontal plane. The arc segment 42 has a radius of 50 mm to 120 mm (for example, 50 mm, 55 mm, 60 mm, The arc segments 42 are arranged in a range of lengths from 80 mm to 200 mm (80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm). The arc segments 42 are arranged to push the bottom portion of the blank into a bridge shape with flat sides and a convex middle. This allows the blank to be stably sandwiched between the second upper roll and second lower roll of the blooming mill during rolling, ensuring a stable blank state and preventing shaking or tipping. This eliminates problems such as low efficiency, poor safety, and poor dimensional accuracy due to blank instability, thereby enabling efficient production of single-tooth track plates 5.

[0034] The seventh inclined surface 34 and the eighth inclined surface 35 form the right flat foot 31 of the second cogging hole 3 in accordance with the sixth plane 41, the ninth inclined surface 36, the fifth plane 37, and the tenth inclined surface 38 form the second center pillar 32 of the second cogging hole 3 in accordance with the arc segment 42, and the eleventh inclined surface 39, the twelfth inclined surface 40, and the seventh plane 43 together form the left flat foot 33 of the second cogging hole 3, and the shape of the second center pillar 32 of the second cogging hole 3 is similar to the shape of the first center pillar 12 of the first cogging hole 1, which can stabilize the state when rolling the mountain-shaped intermediate slab through the second cogging hole 3. The design of the right flat foot 31 and left flat foot 33 of the second cogging hole 3 reduces the thickness of the blank while linearly correcting the portions corresponding to the right bend foot 11 and left bend foot 13 of the first cogging hole 1 of the angle-shaped intermediate slab, further promoting the lengthening of the portions of the angle-shaped intermediate slab corresponding to the main plate 51 and tooth plate 52 of the single-tooth track plate 5. The design of the arc segment 42 of the second cogging hole 3 enhances the flow of metal from this portion to the top of the second center post 32 of the second cogging hole 3, providing a shape that is closer in size and easier to bite into during subsequent rolling. The sixth flat surface 41, seventh flat surface 43 and arc segment 42 of the second cogging hole 3 extrude the bottom portion of the blank into a bridge shape with flat sides and a convex middle, which stabilizes the blank during rolling and prevents shaking or tipping. This eliminates the problems of low efficiency, poor safety, and poor dimensional accuracy caused by the unstable blank, thereby achieving efficient production of the single-tooth track plate 5.

[0035] Furthermore, as shown in FIG. 5 , the angle η between the seventh inclined surface 34 and the plane is 60° to 88° (for example, 60°, 62°, 64°, 66°, 68°, 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°), the angle θ between the eighth inclined surface 35 and the plane is 0° to 30° (for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°), the angle ι between the ninth inclined surface 36 and the fifth plane 37 is 70° to 88° (for example, 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°), and the angle κ between the tenth inclined surface 38 and the fifth plane 37 is 0° to 30° (for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°). is 70° to 88° (e.g., 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°), the angle λ between the eleventh inclined surface 39 and the plane is 0° to 30° (e.g., 0°, 5°, 10°, 15°, 20°, 25°, 30°), the angle μ between the twelfth inclined surface 40 and the plane is 60° to 88° (e.g., 60°, 62°, 64°, 66°, 68°, 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°), and in one embodiment of the present invention, η is 80°, θ is 5°, ι is 80°, κ is 80°, λ is 10°, and μ is 80°.

[0036] The transitions between the seventh inclined surface 34 and the eighth inclined surface 35, between the ninth inclined surface 36 and the fifth plane 37, between the fifth plane 37 and the tenth inclined surface 38, and between the eleventh inclined surface 39 and the twelfth inclined surface 40 each occur via an appropriate arc, and preferably, the transitions between the seventh inclined surface 34 and the eighth inclined surface 35, between the ninth inclined surface 36 and the fifth plane 37, between the fifth plane 37 and the tenth inclined surface 38, and between the eleventh inclined surface 39 and the twelfth inclined surface 40 each occur smoothly via an arc with a radius of 10 mm to 30 mm (e.g., 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm). The transitions between the eighth inclined surface 35 and the ninth inclined surface 36, and between the tenth inclined surface 38 and the eleventh inclined surface 39, are smooth via arcs with radii of 50 mm to 80 mm (for example, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, and 80 mm). The above parameter settings uniformly deform the connection points of each part of the base material, allowing for accurate control of the base material state and achieving stable rolling of the second cogging hole 3.

[0037] Furthermore, the length of the right flat foot 31 is B3, the vertical distance between the fifth plane 37 and the sixth plane 41 is H2, where B3:H2=1 to 2:1, and the length of the left flat foot 33 is B4, where B4:H2=0.6 to 1.2:1. Setting the above parameters can linearly correct the right bent foot 11 and the left bent foot 13 of the angle-shaped intermediate slab while reducing the substrate thickness, and can further promote lengthening of the main plate 51 and the tooth plate 52 of the single-tooth track plate 5.

[0038] Furthermore, the width of the continuous cast blank is equal to or greater than the width W1 of the fourth flat surface 22 on the upper surface of the first lower roll, equal to or less than the width W2 of the first cogging hole 1, and the ratio of the height to the width of the continuous cast blank is 0.7 to 1.3 (e.g., 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3). The above width and height design of the continuous cast blank achieves the goal of good forming of the main plate 51, tooth plate 52, and side wing 53 of the single-tooth track plate 5, reduces dependency on the blank size, and enables the production of large-specification single-tooth track plates 5 from a relatively small blank, resulting in significant energy savings and cost savings.

[0039] The present invention further provides a hot rolling method for a single-tooth track plate 5 using the above-mentioned single-tooth track plate cogging pass, comprising:

[0040] Step 1: cogging a rectangular continuous cast blank in a blooming mill, rolling the continuous cast blank sequentially through one to four first cogging holes 1, gradually rolling the continuous cast blank into a right bend foot 11, a first center post 12, and a left bend foot 13, the first inclined surface 14 and the first flat surface 15 aligning with the fifth inclined surface 21 and the fourth flat surface 22 to form the right bend foot 11, the second inclined surface 16, the second flat surface 17, and the third inclined surface 18 aligning with the fourth flat surface 22 to form the first center post 12, the third flat surface 19 and the fourth inclined surface 20 aligning with the fourth flat surface 22 and the sixth inclined surface 23 to form the left bend foot 13, and the cross section of the continuous cast blank is changed from rectangular to a mountain-shaped cross section to obtain a mountain-shaped intermediate slab;

[0041] Step 2: The angle-shaped intermediate slab obtained in step 1 is further cogging-rolled in a blooming mill, and the angle-shaped intermediate slab is rolled through one to four second cogging holes 3; the seventh inclined surface 34 and the eighth inclined surface 35 gradually crush and thin the right bent foot 11 of the angle-shaped intermediate slab in accordance with the sixth plane 41 to form the right flat foot 31; the ninth inclined surface 36, the fifth plane 37, and the tenth inclined surface 38 gradually thin and press the first center pillar 12 to form the second center pillar 32 in accordance with the arc segment 42; the fourth plane 22 is extruded into the arc segment 42; the eleventh inclined surface 39 and the twelfth inclined surface 40 gradually crush and thin the left bent foot 13 in accordance with the seventh plane 43 to form the left flat foot 33; and the cross section of the angle-shaped intermediate slab is changed from an angle-shaped to an inverted T-shaped intermediate slab.

[0042] Step 3: rough rolling the inverted T-shaped intermediate slab obtained by cogging in the first cogging hole 1 and the second cogging hole 3 to reduce the thickness of the blank and increase the width of the blank;

[0043] and a step 4 of rolling the right flat foot 31 into the main plate 51 of the single-tooth track plate 5, rolling the second center post 32 into the side wing 53 of the single-tooth track plate 5, and rolling the left flat foot 33 into the tooth plate 52 of the single-tooth track plate 5.

[0044] A rectangular continuous cast blank is cogging-rolled through the first cogging hole 1 and the second cogging hole 3 of the blooming mill. The cogging blank is then subjected to rough rolling and finish rolling to obtain a single-tooth track plate 5. The portion of the blank corresponding to the second center post 32 of the second cogging hole 3 forms the side wing 53, which solves the problems of the prior art, where the side wing 53 is easily overfilled and difficult to adjust. The portion of the blank corresponding to the left flat foot 33 of the second cogging hole 3 forms the tooth plate 52, which overcomes the problems of the prior art, where there is insufficient metal in the tooth plate 52 and poor forming.

[0045] From the above description, the embodiments of the present invention have the following technical effects.

[0046] In the single-tooth track plate cogging pass and hot rolling method, a rectangular continuously cast blank is cogging-rolled in the first cogging hole 1 and the second cogging hole 3 of a blooming mill. The cogging blank is then subjected to rough rolling and finish rolling to produce the single-tooth track plate 5. The present invention significantly reduces dependency on blank size, enabling the production of large-specification single-tooth track plates 5 from small blanks, resulting in excellent energy savings. The unique design of the first cogging hole 1 and the second cogging hole 3 eliminates shortcomings such as low efficiency, poor safety, and poor dimensional accuracy due to the instability of the blank, thereby achieving efficient production of single-tooth track plates 5.

[0047] The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Those skilled in the art can make various modifications and variations to the present invention. Any amendments, equivalent replacements, improvements, etc. within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for hot rolling a single-tooth track plate using a single-tooth track plate cogging pass, comprising: Step 1 includes cogging a rectangular continuous cast blank in a blooming mill, sequentially rolling the continuous cast blank through one to four first cogging holes, gradually rolling the continuous cast blank into a right bend foot, a first center post, and a left bend foot, the first inclined surface and the first flat surface align with the fifth inclined surface and the fourth flat surface to form the right bend foot, the second inclined surface, the second flat surface, and the third inclined surface align with the fourth flat surface to form the first center post, and the third flat surface and the fourth inclined surface align with the fourth flat surface to form the left bend foot, and the cross section of the continuous cast blank is changed from rectangular to a mountain-shaped cross section to obtain a mountain-shaped intermediate slab; Step 2: the mountain-shaped intermediate slab obtained in step 1 is further cogginged in a blooming mill, the mountain-shaped intermediate slab is rolled through one to four second cogging holes, the seventh and eighth inclined surfaces are aligned with the sixth plane to gradually crush and thin the right bent foot of the mountain-shaped intermediate slab, forming a right flat foot; the ninth, fifth, and tenth inclined surfaces are aligned with the arc segment to gradually thin and raise the first center pillar, forming a second center pillar; the fourth plane is extruded into an arc segment; the eleventh, twelfth, and seventh inclined surfaces are aligned with the seventh plane to gradually crush and thin the left bent foot, forming a left flat foot; and the cross section of the mountain-shaped intermediate slab is changed from mountain-shaped to inverted T-shaped, thereby obtaining an inverted T-shaped intermediate slab. Step 3: rough rolling the inverted T-shaped intermediate slab obtained by cogging in the first cogging hole and the second cogging hole to reduce the thickness of the green sheet and increase the width of the green sheet; Step 4 includes finish-rolling the raw material after rough rolling in step 3, precision-forming each portion of the raw material corresponding to the main plate, side wing, and tooth plate of the single-tooth track plate to manufacture the single-tooth track plate, rolling the right flat foot into the main plate of the single-tooth track plate, rolling the second center post into the side wing of the single-tooth track plate, and rolling the left flat foot into the tooth plate of the single-tooth track plate; the single-tooth track plate cogging path comprises a first cogging hole and a second cogging hole, the first cogging hole being formed by a first top roll and a first bottom roll of a blooming mill, and the second cogging hole being formed by a second top roll and a second bottom roll of the blooming mill; the first cogging hole is a front hole, and is used to press a rectangular continuous casting base material into an angle-shaped intermediate slab including a right bending foot, a first center column, and a left bending foot; The second cogging hole is a rear hole, and is used to press the mountain-shaped intermediate slab against the inverted T-shaped intermediate slab including the right flat foot, the second center column, and the left flat foot; the lower surface of the first upper roll includes a first inclined surface, a first flat surface, a second inclined surface, a second flat surface, a third inclined surface, a third flat surface, and a fourth inclined surface, the first inclined surface, the first flat surface, the second inclined surface, the second flat surface, the third inclined surface, the third flat surface, and the fourth inclined surface are sequentially connected, the first flat surface and the third flat surface are located on the same horizontal plane, the first inclined surface, the second inclined surface, the third inclined surface, and the fourth inclined surface are located above the first flat surface, the second flat surface is parallel to the first flat surface, and the second inclined surface, the second flat surface, and the third inclined surface form a trapezoidal groove on the lower surface of the first upper roll, an upper surface of the first lower roll includes a fifth inclined surface, a fourth flat surface, and a sixth inclined surface, the fifth inclined surface, the fourth flat surface, and the sixth inclined surface are connected in sequence, and the fifth inclined surface and the sixth inclined surface are each located above the fourth flat surface; the lower surface of the second upper roll includes a seventh inclined surface, an eighth inclined surface, a ninth inclined surface, a fifth flat surface, a tenth inclined surface, an eleventh inclined surface, and a twelfth inclined surface, and the seventh inclined surface, the eighth inclined surface, the ninth inclined surface, the fifth flat surface, the tenth inclined surface, the eleventh inclined surface, and the twelfth inclined surface are connected in sequence, the fifth plane is horizontally provided, a lower end of the seventh inclined plane and a lower end of the twelfth inclined plane are located on the same horizontal plane, the eighth inclined plane and the eleventh inclined plane are each located above the twelfth inclined plane, the ninth inclined plane and the tenth inclined plane are each located above the eleventh inclined plane, and the ninth inclined plane, the fifth plane, and the tenth inclined plane form a trapezoidal groove in the lower surface of the second upper roll, the upper surface of the second lower roll includes a sixth plane, an arc segment, and a seventh plane, the sixth plane, the arc segment, and the seventh plane being sequentially connected, the sixth plane and the seventh plane being located on the same horizontal plane, and the arc segment being located above the sixth plane. A method for hot rolling single-tooth track plates.

2. the angle α between the first inclined surface and the first plane is 30° to 70°; the angle β between the second inclined surface and the first plane is 65° to 88°; the angle γ between the third inclined surface and the third plane is 65° to 88°; the angle δ between the fourth inclined surface and the third plane is 30° to 70°; a smooth transition is made between the second inclined surface and the second plane, and between the second plane and the third inclined surface, via an arc having a radius of 10 mm to 30 mm, a smooth transition occurs between the first inclined surface and the first plane, between the first plane and the second inclined surface, between the third inclined surface and the third plane, and between the third plane and the fourth inclined surface, each via an arc having a radius of 25 mm to 60 mm; The length of the first slope is B1, the vertical distance between the second plane and the first plane is H1, and B1:H1=0.7 to 2:1; The length of the fourth inclined surface is B2, and B2:H1=0.5 to 1.2:

1.

2. The method for hot rolling a single-tooth track plate according to claim 1.

3. an angle ε between the fifth inclined surface and the fourth plane is 50° to 88°, and an angle ζ between the fourth plane and the sixth inclined surface is 50° to 88°; A smooth transition is made between the fifth inclined surface and the fourth plane, and between the fourth plane and the sixth inclined surface, via an arc having a radius of 25 mm to 60 mm, respectively.

2. The method for hot rolling a single-tooth track plate according to claim 1.

4. the angle η between the seventh inclined surface and the horizontal plane is 60° to 88°; the angle θ between the eighth inclined surface and the horizontal plane is 0° to 30°; the angle ι between the ninth inclined surface and the fifth plane is 70° to 88°; the angle κ between the tenth inclined surface and the fifth plane is 70° to 88°; the angle λ between the eleventh inclined surface and the horizontal plane is 0° to 30°; The angle μ between the twelfth inclined surface and the horizontal plane is 60° to 88°, a smooth transition occurs between the seventh inclined surface and the eighth inclined surface, between the ninth inclined surface and the fifth plane, between the fifth plane and the tenth inclined surface, and between the eleventh inclined surface and the twelfth inclined surface, each via an arc having a radius of 10 mm to 30 mm; A smooth transition is made between the eighth inclined surface and the ninth inclined surface, and between the tenth inclined surface and the eleventh inclined surface, via an arc having a radius of 50 mm to 80 mm, respectively.

2. The method for hot rolling a single-tooth track plate according to claim 1.

5. The radius of the arc segment is 50 mm to 120 mm, and the length of the arc segment is 80 mm to 200 mm.

2. The method for hot rolling a single-tooth track plate according to claim 1.

6. The length of the right flat foot is B3, the vertical distance between the fifth plane and the sixth plane is H2, and B3:H2=1 to 2:1; The length of the left flat foot is B4, and B4:H2=0.6-1.2:

1.

6. The method for hot rolling a single-tooth track plate according to claim 5.

7. a width of the continuously cast body is equal to or greater than a width W1 of the fourth flat surface on the upper surface of the first lower roll, and is equal to or less than a width W2 of the first cogging hole, and a height-to-width ratio of the continuously cast body is 0.7 to 1.

3.

4. The method for hot rolling a single-tooth track plate according to claim 3.

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