Single-tooth track plate cogging path 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 in particular to a single-tooth track plate cogging path and a hot rolling method. [Background technology]

[0002] Tracks are commonly used running parts for construction machinery. Compared with tires, tracks can be applied to various poor working environments and have advantages such as wear resistance and impact resistance. Track plates are essential metallurgical products for producing tracks, and there are various forming methods, such as casting, pressing, machining, and rolling. Compared with casting, pressing, and machining, the rolling forming method is more efficient, less costly, and has better overall performance, so it is increasingly being used. Meanwhile, since the cross-sectional shape of track plates is complex and asymmetric, it is difficult to control the deformation of rolled materials during cogging rolling, and they are prone to bending, twisting, reverse steel, and overlay steel, making it difficult to realize automated production. For this reason, track plates, especially single-tooth track plate forming with high asymmetry, must be produced in a way that artificial auxiliary rolling material is embedded, which greatly increases the risk of human injury accidents.

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

[0004] The paper "Finite element simulation of track steel rolling" published in July 2009, Vol. 30, 3rd issue of "Iron and Steel Vanadium Titanium" is related to the track steel rolling process. The cross-sectional shape of single-tooth track steel is complex, and it is easy to have phenomena such as twist, warping, and transverse bending during rolling, which affects the forward progress of rolling. To address the serious problem of track steel deep hole rolling twist, the pass parameters are optimized, and the twist angle during deep hole rolling of track steel is reduced from 135.6° to 13.85°, meeting the requirements for normal penetration of subsequent passes and ensuring smooth production. In addition to the serious twist of the 6 holes mentioned here, the rolling process in this document also has three additional box-shaped holes in each of the 1-hole, 2-hole, and 3-hole to reduce the material, which increases the rolling roll length and passes, resulting in low production efficiency and high energy. In addition, in all four-hole, five-hole and eight-hole rolling methods, the support condition at the bottom of the rolling material is unstable, and it is easy for the steel to tilt or fall over after turning over, which causes protrusion problems that affect subsequent rolling. It is difficult to control the dimensional accuracy, and artificial auxiliary rolling material bite is required, which is disadvantageous to improving production rhythm and controlling safety risks. Summary of the Invention [Problem to be solved by the invention]

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

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The single-tooth track plate cogging path has a first cogging hole and a second cogging hole, the first cogging hole being formed by the first upper roll and the first lower roll of a blooming mill, and the second cogging hole being formed by the second upper roll and the second lower roll of a blooming mill, the first cogging hole being a front hole used for pressing a rectangular continuous casting base material 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 being a rear hole used for pressing 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-mentioned single-tooth track plate cogging path, the lower surface of the first upper roll includes a first sloping surface, a first plane, a second sloping surface, a second plane, a third sloping surface, a third plane, and a fourth sloping surface, the first sloping surface, the first plane, the second sloping surface, the second plane, the third sloping surface, the third plane, and the fourth sloping surface are connected in sequence, the first plane and the third plane are located on the same horizontal plane, the first sloping surface, the second sloping surface, the third sloping surface, and the fourth sloping surface are each located above the first plane, the second plane is parallel to the first plane, and the second sloping surface, the second plane, and the third sloping surface form a trapezoidal groove on the lower surface of the first upper roll.

[0009] Furthermore, in the above-mentioned single-tooth track plate cogging path, 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°, and the angle δ between the fourth inclined surface and the third plane is 30° to 70°. Preferably, the angles between the second inclined surface and the second plane, and between the second plane and the third inclined surface, are each an arc having 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 having a radius of 25 mm to 60 mm, respectively, and preferably, a length of the first inclined surface is B1, a vertical distance between the second plane and the first plane is H1, B1:H1=0.7 to 2:1, and a length of the fourth inclined surface is B2, B2:H1=0.5 to 1.2:1.

[0010] Furthermore, in the above-mentioned single-tooth track plate cogging path, the upper surface of the first lower roller includes a fifth inclined surface, a fourth plane, and a sixth inclined surface, the fifth inclined surface, the fourth plane, and the sixth inclined surface are successively connected, the fifth inclined surface and the sixth inclined surface are each located above the fourth plane, preferably, 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°, and preferably, a smooth transition occurs between the fifth inclined surface and the fourth plane, and between the fourth plane and the sixth inclined surface, respectively, via a circular arc having a radius of 25 mm to 60 mm.

[0011] Furthermore, in the above-mentioned 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 end of the seventh inclined surface and the lower end of the twelfth inclined surface are located on the same horizontal plane, the eighth inclined surface and the eleventh inclined surface are each located above the twelfth inclined surface, the ninth inclined surface and the tenth inclined surface are each located above the eleventh inclined surface, and the ninth inclined surface, the fifth plane, and the tenth inclined surface form a trapezoidal groove on the lower surface of the second upper roller.

[0012] Furthermore, in the above-mentioned single-tooth crawler plate cogging path, 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°, and the angle κ between the twelfth inclined surface and the horizontal plane is 0° to 30°. The angle μ with respect to the horizontal plane is 60° to 88°, and preferably, there is a smooth transition 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 a circular arc with a radius of 10 mm to 30 mm, and there is a smooth transition between the eighth inclined surface and the ninth inclined surface, and between the tenth inclined surface and the eleventh inclined surface, each via a circular arc with a radius 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, a radius of the arc segment is 50 mm to 120 mm, and a length of the arc segment is 80 mm to 200 mm.

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

[0015] Furthermore, in the above-mentioned single-tooth track plate cogging pass, the width of the continuous casting base is greater than or equal to the width W1 of the fourth plane on the upper surface of the first lower roll, the width of the continuous casting base is less than or equal to 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, 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 casting blank in a blooming mill, sequentially rolling the continuous casting blank through 1 to 4 first cogging holes, gradually rolling the continuous casting blank into a right bending foot, a first center column, and a left bending 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 bending 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 column, the third flat surface and the fourth inclined surface align with the fourth flat surface and the sixth inclined surface to form the left bending foot, and the cross section of the continuous casting blank is changed from rectangular to a mountain-shaped cross section to obtain a mountain-shaped intermediate slab;

[0018] Step 2: the mountain-shaped intermediate slab obtained in step 1 is further cogging-rolled by a blooming mill, the mountain-shaped intermediate slab is rolled through 1 to 4 second cogging holes, the 7th and 8th slopes gradually crush and thin the right bent foot of the mountain-shaped intermediate slab according to the 6th plane to form a right flat foot, the 9th, 5th and 10th slopes gradually thin and push the first center pillar to the arc segment to form a second center pillar, the 4th plane is extruded into an arc segment, the 11th and 12th slopes gradually crush and thin the left bent foot according to the 7th 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 to obtain an inverted T-shaped intermediate slab.

[0019] Step 3: roughly 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 base material after rough rolling in step 3, precisely forming each portion of the base 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. Effect of the Invention

[0021] According to the analysis, the present invention discloses a cogging path and hot rolling method for a single-tooth track plate, in which a rectangular continuous cast blank is cogging-rolled through the first and second cogging holes of a blooming mill, and the blank after cogging is further subjected to rough rolling and finish rolling to obtain a single-tooth track plate. The present invention significantly reduces the dependency on the blank size, and can produce a single-tooth track plate of large specifications from a small blank, which has an excellent energy-saving effect. The unique design of the first and second cogging holes eliminates the shortcomings such as low efficiency, poor safety, and poor dimensional accuracy caused by the unstable blank, and realizes the efficient production of single-tooth track plates. [Brief description of the drawings]

[0022] The specification 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 explanations are intended to explain the present invention and are not intended to constitute an undue limitation of the present invention. [Figure 1] FIG. 2 is a schematic structural diagram of a first cogging hole according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a structural schematic diagram of a second cogging hole according to an embodiment of the present invention. [Diagram 3] 1 is a schematic diagram showing the structure of a single-tooth crawler 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. [Diagram 5]FIG. 11 is another structural schematic diagram of a second cogging hole according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the embodiments of the present invention will be described in detail with reference to the 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 recognize that modifications and variations of the present invention are possible without departing from the scope and 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 includes such modifications and variations within the scope of the claims and their equivalents.

[0024] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "ceiling", "bottom", etc., is based on the orientation or positional relationship shown in the drawings, and is intended to facilitate the description of the present invention, and is not intended to configure and operate the present invention in a specific orientation, and cannot be understood as limiting the present invention. The terms "connect", "connection", and "installation" used in the present invention should be understood in a broad sense, and may be, for example, a fixed connection, a removable connection, a direct connection, or an indirect connection via an intermediate member. A person skilled in the art can understand the specific meaning of the above terms according to 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 markings. Like or similar symbols 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 to provide a single-tooth track plate cogging path.

[0027] This cogging path includes a first cogging hole 1 and a second cogging hole 3, the first cogging hole 1 consisting of the first upper roll and the first lower roll of the blooming mill, and the second cogging hole 3 consisting of the second upper roll and the second lower roll of the blooming mill, the first cogging hole 1 being a front hole used for pressing a 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 being a rear hole used for pressing 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 achieving 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 plane 15, a second inclined surface 16, a second plane 17, a third inclined surface 18, a third plane 19, and a fourth inclined surface 20, and the first inclined surface 14, the first plane 15, the second inclined surface 16, the second plane 17, the third inclined surface 18, the third plane 19, and the fourth inclined surface 20 are sequentially connected, the first plane 15 and the third plane 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 plane 15, the second plane 17 is parallel to the first plane 15, and the second inclined surface 16, the second plane 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, the fifth inclined surface 21, the fourth plane 22, and the sixth inclined surface 23 being connected in sequence, and the fifth inclined surface 21 and the sixth inclined surface 23 being each located above the fourth plane 22.

[0029] The first inclined surface 14 and the first plane 15 match with the fifth inclined surface 21 and the fourth plane 22 to form the right bend foot 11 of the first cogging hole 1, the second inclined surface 16, the second plane 17 and the third inclined surface 18 match with the fourth plane 22 to form the first center post 12 of the first cogging hole 1, and the third plane 19 and the fourth inclined surface 20 match with the fourth plane 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 respectively having a curved structure, and the curved design of the right bend foot 11 and the left bend foot 13 can maximize the width and height of each part 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 with a small blank, with fewer rolling passes and the number of passes, high production process 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 plane 22, and the sixth inclined surface 23 combine to form the bottom of the first cogging hole 1 into a groove-shaped structure, which allows the first upper roll and the first lower roll of the blooming mill to stably clamp the blank, stabilizes the support state of the bottom of the blank, and achieves stable rolling. This in turn makes it possible to control the dimensional accuracy of the blank, effectively reducing the degree of twisting and bending of the blank during rolling, and preventing the impact of the blank's tilt or tipping over on the subsequent rolling. Without the need for artificial assistance to bite into the rolled material, the production rhythm is effectively improved and safety risks are reduced.

[0030] Furthermore, as shown in FIG. 4, the angle α between the first inclined surface 14 and the first plane 15 is 30° to 70° (e.g., 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 shortage or excess. The angle β between the second inclined surface 16 and the first plane 15 is 65° to 88° (e.g., 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 plane 19 is 65° to 88° (e.g., 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° (e.g., 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°), and the inclination angle of the fourth inclined surface 20 is designed to stabilize the rolling of the raw material through the first cogging hole 1 and to supply a raw material of an appropriate length to the left flat foot 33 of the second cogging hole 3, preventing metal shortage or excess. 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] A suitable arc is provided between the second inclined surface 16 and the second flat surface 17, and between the second flat surface 17 and the third inclined surface 18. Preferably, a smooth transition occurs between the second inclined surface 16 and the second flat surface 17, and between the second flat surface 17 and the third inclined surface 18, respectively, via an arc having 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). 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, there is a smooth transition via a circular arc with a radius of 25 mm to 60 mm (for example, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm). The above parameter settings uniformly deform the connection points of each part of the base material, reduce shear resistance, and lengthen the first center post 12 to the ideal height as much as possible, and also satisfy the dimensional control of the side wing 53 of the completed single-tooth crawler 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 plane 17 and the first plane 15 is H1, and B1:H1=0.7-2:1, and the length of the fourth inclined surface 20 is B2, and B2:H1=0.5-1.2:1. The design of the inclination angle and length of the first inclined surface 14 stabilizes the rolling of the green material through the first cogging hole 1 and can supply a green material of an appropriate length to the right foot 31 of the second cogging hole 3, preventing the phenomenon of metal shortage or excess. The design of the inclination angle and length of the fourth inclined surface 20 stabilizes the rolling of the green material through the first cogging hole 1 and can supply a green material of an appropriate length to the left foot 33 of the second cogging hole 3, preventing the phenomenon of metal shortage or excess.

[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. 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 seventh inclined surface 34 and the twelfth inclined surface 40 are located on the same horizontal plane, the eighth inclined surface 35 and the eleventh inclined surface 39 are located above the twelfth inclined surface 40, the ninth inclined surface 36 and the tenth inclined surface 38 are located above the eleventh inclined surface 39, and the ninth inclined surface 36, the fifth inclined surface 37 and the tenth inclined surface 38 form a trapezoidal groove on the lower surface of the second upper roller. The upper surface of the second lower roll includes a sixth plane 41, an arc segment 42 and a seventh plane 43, and the sixth plane 41, the arc segment 42 and the seventh plane 43 are connected in sequence, the sixth plane 41 and the seventh plane 43 are located on the same horizontal plane, the arc segment 42 is located above the sixth plane 41, and the radius of the arc segment 42 is 50 mm to 120 mm (for example, 50 mm, 55 mm, 60 mm, The lengths of the arc segments 42 are 80mm to 200mm (80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm). The arc segments 42 are installed so as to push out the bottom part of the blank into a bridge shape with flat sides and a protruding middle, so that the blank can be stably sandwiched between the second upper roll and the second lower roll of the blooming mill during rolling, the blank state is stable, and there is no shaking or tipping, thus eliminating shortcomings such as low efficiency, poor safety, and poor dimensional accuracy due to the unstable blank, and realizing efficient production of the single-tooth track plate 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 approximate to the shape of the first center pillar 12 of the first cogging hole 1, thereby stabilizing the condition when rolling the mountain-shaped intermediate slab through the second cogging hole 3. The design of the right flat foot 31 and the left flat foot 33 of the second cogging hole 3 can straighten the portion corresponding to the right bent foot 11 and the left bent foot 13 of the first cogging hole 1 of the mountain-shaped intermediate slab while thinning the thickness of the base material, and can further promote the lengthening of the portion corresponding to the main plate 51 and the tooth plate 52 of the single-tooth track plate 5 of the mountain-shaped intermediate slab. The design of the arc segment 42 of the second cogging hole 3 can flow the metal from this portion to the upper part of the second center pillar 32 of the second cogging hole 3, increase it, and provide a shape that is close in size and easy to bite into during subsequent rolling. The sixth plane 41, the seventh plane 43 and the arc segment 42 of the second cogging hole 3 extrude the base part of the base material into a bridge shape with flat both sides and a convex middle, so that the base material state is stable during rolling and there is no shaking or falling, and the deficiencies such as low efficiency, poor safety, and poor dimensional accuracy due to the unstable base material are eliminated, and efficient production of the single-tooth track plate 5 is realized.

[0035] Furthermore, as shown in FIG. 5 , the angle η between the seventh inclined surface 34 and the plane is 60° to 88° (e.g., 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° (e.g., 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° (e.g., 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 70° to 88° (e.g., 70°, 72°, 74°, 76°, 78°, 80°, 82°, 84°, 86°, 88°). 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 seventh inclined surface 34 and the eighth inclined surface 35, the ninth inclined surface 36 and the fifth plane 37, the fifth plane 37 and the tenth inclined surface 38, and the eleventh inclined surface 39 and the twelfth inclined surface 40 each transition via an appropriate arc, and preferably the seventh inclined surface 34 and the eighth inclined surface 35, the ninth inclined surface 36 and the fifth plane 37, the fifth plane 37 and the tenth inclined surface 38, and the eleventh inclined surface 39 and the twelfth inclined surface 40 each transition 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). 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, there is a smooth transition via a circular arc with a radius of 50 mm to 80 mm (for example, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm), respectively. The above parameter settings uniformly deform the connection points of each part of the green body, allowing the state of the green body to be accurately controlled, 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=1-2:1, and the length of the left flat foot 33 is B4, where B4:H2=0.6-1.2:1. The above parameter settings can straighten the right bent foot 11 and the left bent foot 13 of the mountain-shaped intermediate slab while reducing the base thickness, and can further promote the 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 casting blank is equal to or larger than the width W1 of the fourth flat surface 22 on the upper surface of the first lower roll, the width of the continuous casting blank is equal to or smaller than the width W2 of the first cogging hole 1, and the ratio of the height to the width of the continuous casting 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 casting blank can achieve the goal of good forming of the main plate 51, the tooth plate 52 and the side wing 53 of the single-tooth track plate 5, reduce the dependency on the blank size, and produce a large-specification single-tooth track plate 5 from a relatively small blank, which has an excellent energy-saving effect and saves costs.

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

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

[0041] Step 2: the mountain-shaped intermediate slab obtained in step 1 is further cogging-rolled by a blooming mill, the mountain-shaped intermediate slab is rolled by 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 mountain-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 push and raise the first central pillar 12 in accordance with the arc segment 42 to form the second central pillar 32, the fourth plane 22 is extruded to 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 mountain-shaped intermediate slab is changed from mountain-shaped to inverted T-shaped to obtain an inverted T-shaped intermediate slab;

[0042] Step 3 of roughly 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 green thickness and increase the green width;

[0043] A hot rolling method for a single-tooth track plate 5 is provided, which includes: in step 3, finish rolling the base material after rough rolling; precision forming each portion of the base material corresponding to the main plate 51, tooth plate 52, and side wing 53 of the single-tooth track plate 5 to manufacture the single-tooth track plate 5; and in step 4, 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 in the first cogging hole 1 and the second cogging hole 3 of a blooming mill, and the blank after cogging is further subjected to rough rolling and finish rolling to obtain a single-tooth track plate 5. The design in which the part of the blank corresponding to the second center post 32 of the second cogging hole 3 forms the side wing 53 solves the problem in the prior art that the side wing 53 is easily overfilled and difficult to adjust. The design in which the part of the blank corresponding to the left flat foot 33 of the second cogging hole 3 forms the tooth plate 52 overcomes the defects in the prior art that the tooth plate 52 has insufficient metal and is poorly formed.

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

[0046] In the single-tooth track plate cogging pass and hot rolling method, a rectangular continuous cast blank is cogging-gated in the first cogging hole 1 and the second cogging hole 3 of a blooming mill, and the blank after cogging is further subjected to rough rolling and finish rolling to obtain the single-tooth track plate 5. The present invention significantly reduces the dependency on the blank size, and can produce a large-size single-tooth track plate 5 from a small blank, thus achieving excellent energy saving effects. 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 realizing the efficient production of the single-tooth track plate 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 single-tooth track plate cogging path includes a first cogging hole and a second cogging hole, the first cogging hole being formed by a first upper roll and a first lower roll of a blooming mill, and the second cogging hole being formed by a second upper roll and a second lower roll of the blooming mill, The first cogging hole is a front hole, which is used to press a rectangular continuous casting base material into a mountain-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 an inverted T-shaped intermediate slab including a right flat foot, a second center column, and a left flat foot. Single tooth track plate cogging path.

2. the lower surface of the first upper roll includes a first inclined surface, a first plane, a second inclined surface, a second plane, a third inclined surface, a third plane, and a fourth inclined surface, the first inclined surface, the first plane, the second inclined surface, the second plane, the third inclined surface, the third plane, and the fourth inclined surface are sequentially connected, the first plane and the third plane 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 plane, the second plane is parallel to the first plane, and the second inclined surface, the second plane, and the third inclined surface form a trapezoidal groove on the lower surface of the first upper roll.

2. The single tooth track plate cogging path of claim 1.

3. 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°; Preferably, a smooth transition occurs between the second inclined surface and the second plane, and between the second plane and the third inclined surface, via a circular 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 of which transitions via a circular arc having a radius of 25 mm to 60 mm; Preferably, the length of the first inclined surface 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.

3. The single tooth track plate cogging path of claim 2.

4. an 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 connected in sequence, 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 plane is 50° to 88°, and the angle ζ between the fourth plane and the sixth inclined surface is 50° to 88°, Preferably, the fifth inclined surface and the fourth plane, and the fourth plane and the sixth inclined surface each transition smoothly via a circular arc having a radius of 25 mm to 60 mm.

2. The single tooth track plate cogging path of claim 1.

5. the lower surface of the second upper roll includes a seventh inclined surface, an eighth inclined surface, a ninth inclined surface, a fifth plane surface, 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 surface, the tenth inclined surface, the eleventh inclined surface, and the twelfth inclined surface are sequentially connected to each other; 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 located above the twelfth inclined plane, the ninth inclined plane and the tenth inclined plane are located above the eleventh inclined plane, and the ninth inclined plane, the fifth plane, and the tenth inclined plane form a trapezoidal groove on the lower surface of the second upper roller.

2. The single tooth track plate cogging path of claim 1.

6. 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°, Preferably, 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, there is a smooth transition via a circular arc having a radius of 10 mm to 30 mm, The eighth inclined surface and the ninth inclined surface, and the tenth inclined surface and the eleventh inclined surface each smoothly transition via a circular arc having a radius of 50 mm to 80 mm.

6. The single tooth track plate cogging path of claim 5.

7. 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, the arc segment being located above the sixth plane, the radius of the arc segment being 50 mm to 120 mm, and the length of the arc segment being 80 mm to 200 mm.

6. The single tooth track plate cogging path of claim 5.

8. 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.

8. The single tooth track plate cogging path of claim 7.

9. a width of the continuous cast body is equal to or larger than a width W1 of the fourth flat surface of the upper surface of the first lower roll, a width of the continuous cast body is equal to or smaller than a width W2 of the first cogging hole, and a height-to-width ratio of the continuous cast body is 0.7 to 1.

3.

5. The single tooth track plate cogging path of claim 4.

10. A hot rolling method for a single-tooth track plate using the single-tooth track plate cogging pass according to any one of claims 1 to 9, a step 1 of cogging a rectangular continuous casting blank in a blooming mill, rolling the continuous casting blank sequentially through one to four first cogging holes, gradually rolling the continuous casting 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, 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 casting blank is changed from rectangular to a mountain-shaped cross section to obtain a mountain-shaped intermediate slab; Step 2: further cogging the mountain-shaped intermediate slab obtained in step 1 with a blooming mill, rolling the mountain-shaped intermediate slab with one to four second cogging holes, the seventh and eighth inclined surfaces 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 inclined surfaces gradually thin and raise the first central pillar in accordance with the arc segment to form a second central pillar, extruding the fourth plane into an arc segment, the eleventh, twelfth and seventh inclined surfaces gradually crush and thin the left bent foot in accordance with the seventh plane to form a left flat foot, and changing the cross section of the mountain-shaped intermediate slab from a mountain-shaped to an inverted T-shaped intermediate slab. Step 3: roughly rolling the inverted T-shaped intermediate slab obtained by cogging in the first cogging hole and the second cogging hole to reduce the green thickness and increase the green width; and step 4 of finish-rolling the base material after rough rolling in step 3, precisely forming each portion of the base 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. A method for hot rolling single-tooth track plates.

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