A method for determining an "S" shape rolling curve of bidirectional rolling of a large ring piece, an electronic device and a storage medium

Abstract

The application provides a method for determining an S-shaped rolling curve of bidirectional rolling of a large ring piece, an electronic device and a storage medium, and is applied to the technical field of ring piece rolling forming processing, and comprises the following steps: step one, establishing the geometric configuration and coordinate system of a ring blank section before deformation and a ring piece section after deformation in a bidirectional rolling process of the ring piece; step two, establishing an equation of the S-shaped rolling curve; step three, determining boundary conditions of the S-shaped rolling curve equation; step four, determining the height h0, the wall thickness b0 of the ring blank and the height h f , the wall thickness b f of the ring piece and the S-shaped rolling curve coefficient k; step five, solving the undetermined coefficient in the S-shaped rolling curve equation; and step six, drawing an S-shaped rolling curve graph. The method is beneficial to coordinated control of the movement of a roller and a rolling process, realizes radial and axial coordinated deformation in the bidirectional rolling process of the ring piece, and improves the stability of the rolling process.

Description

Technical Field

[0001] This invention belongs to the field of ring rolling forming technology, specifically relating to a method for determining the "S"-shaped rolling curve of a large ring bidirectional rolling process, an electronic device, and a storage medium. Background Technology

[0002] The rolling curve describes the instantaneous distribution relationship between radial and axial deformation during the bidirectional rolling of the ring, which in turn determines the deformation history and roll trajectory of the ring forming process. Therefore, it plays an important role in the coordinated control of roll movement, the stability of the rolling process, and the geometric accuracy and microstructure of the final rolled ring.

[0003] The mathematical model description and determination method of the rolling curve are also key technical problems that urgently need to be solved in the design and development of control systems for modern advanced CNC ring rolling equipment. Therefore, the form of the rolling curve and its determination method are among the most important core technologies for bidirectional rolling of ring parts made of difficult-to-deform materials in aerospace (titanium alloys, high-temperature alloys, etc.).

[0004] Chinese invention patent CN104156499 discloses a method for determining the rolling curve in a bidirectional rolling process of a ring, specifically a method for determining "convex," "straight," and "concave" rolling curves based on a power function. This is significant for overcoming the shortcomings of existing technologies where rolling curve determination relies on experience and lacks a scientific method. However, practical applications show that these three types of rolling curves are not well-suited for large ring rolling processes, and the determination process of the power exponent in the rolling curve function is complex and inconvenient for application in the control systems of modern advanced CNC ring rolling equipment.

[0005] On the other hand, according to the literature "Guo Lianggang, Di Weijia, Yang He, Li Yongtang. Design method of rolling curve for bidirectional rolling process of ring parts of difficult-to-deform materials, Journal of Mechanical Engineering, 2014, 50(16): 83-88", considering the advantages of "convex" and "concave" rolling curves for bidirectional rolling of titanium alloy rectangular ring parts, an "S" shaped rolling curve is formed by combining the "convex" and "concave" rolling curves, and the "S" shaped rolling curve is described by a piecewise power exponential function. This method has the following problems: (1) The rolling curve The line function is only applicable to the specific rectangular ring size mentioned in the literature and is not applicable to the rolling of rings of other sizes, so it is not universal; at the same time, no specific method for determining the rolling curve is given; (2) The “S”-shaped rolling curve described by the piecewise power function lacks specific basis and method for determining the power exponent and still relies on experience and trial and error; (3) Based on the above two reasons, this method is also not convenient to be applied to the CNC system of modern advanced CNC ring rolling equipment, so it is difficult to achieve coordinated control of the rolling process.

[0006] Meanwhile, the bidirectional rolling process of large ring blanks is usually divided into three stages: (1) ring blank shaping stage; (2) stable rolling stage; and (3) rounding stage. However, the "convex", "straight", and "concave" rolling curves mentioned in the above patent (publication number CN104156499) are not suitable for the purpose and requirements of the three stages of large ring blank rolling, and are also difficult to apply to the development of CNC systems for modern advanced CNC ring rolling equipment; and the "S"-shaped rolling curve design method described by the piecewise power exponent function mentioned in the above literature is not universal and lacks specific basis and method for determining the power exponent, and is also not suitable for the development and application of CNC systems for modern advanced CNC ring rolling equipment. Summary of the Invention

[0007] In view of the above-mentioned problems in the prior art, the purpose of this invention is to provide a method for determining the "S"-shaped rolling curve of bidirectional rolling of large ring parts, which is applicable to the bidirectional rolling process of large ring parts and the development and application of CNC systems for modern advanced CNC ring rolling equipment.

[0008] A method for determining the "S"-shaped rolling curve of a large ring-shaped bidirectional rolling mill includes the following steps:

[0009] Step 1: Establish the geometric configuration and coordinate system of the ring billet section before deformation and the ring section after deformation during the bidirectional rolling process; wherein, D is set. f h f b f Let D0, h0, and b0 be the outer diameter, height, and wall thickness of the ring blank, respectively; and let D0, h0, and b0 be the outer diameter, height, and wall thickness of the ring blank, respectively, so that the starting coordinates of the "S"-shaped rolling curve are (b0, h0) and the ending coordinates of the "S"-shaped rolling curve are (b0, h0). f h f );

[0010] Step 2: Establish the equation of the "S"-shaped rolling curve; under the geometric configuration and coordinate system of the ring billet section before deformation and the ring section after deformation in the bidirectional rolling process established in Step 1, the equation of the "S"-shaped rolling curve is determined by the quadratic rational fraction shown in Equation (1):

[0011] h = h f +[a1(bb f ) 2 +a2(bb f )+a3]) / [a4(bb f ) 2 +a5(bb f )+1] (1)

[0012] In equation (1), h is the instantaneous height of the ring that changes continuously during the forming process; b is the instantaneous wall thickness of the ring that changes continuously during the forming process. f b f These represent the final height and wall thickness of the ring after forming; a1, a2, a3, a4, and a5 are all undetermined coefficients.

[0013] Step 3: Determine the boundary conditions for the equation of the "S"-shaped rolling curve; the boundary conditions are the coordinate points through which the "S"-shaped rolling curve passes in the coordinate system, including the starting point (b0, h0) and the ending point (b0, h0). f h f ), waypoints (b) f +(b0-b f ) / 2, h f +k(h0-h f The curve starts at (b0, h0) and ends at (b0, h0). f h f The slope at () is 0; where k is the introduced “S”-shaped rolling curve coefficient, used to describe the proportion of the ring billet height deformation to the total height deformation when the ring billet wall thickness reduction reaches half of the total wall thickness reduction in the ring rolling process. The value range of K is (0, 1).

[0014] Step 4: Determine the height h0 of the ring blank, the wall thickness b0, and the height h of the ring component. f Wall thickness b f And the coefficient k of the "S"-shaped rolling curve;

[0015] Step 5: Solve for the undetermined coefficients in the equation of the "S"-shaped rolling curve;

[0016] Step 6: Draw the “S” shaped rolling curve.

[0017] Preferably, the cross-section of the ring blank is a rectangle enclosed by the first side I, the upper side J, the second side K, and the lower side L; the cross-section of the ring piece is a rectangle enclosed by the first side i, the upper side j, the second side k, and the lower side l; wherein, the first side I of the ring blank cross-section partially coincides with the first side i of the ring piece cross-section; and the lower side L of the ring blank cross-section partially coincides with the lower side l of the ring piece cross-section.

[0018] Preferably, the starting coordinates (b0, h0) of the "S"-shaped rolling curve are the intersection of the upper edge J and the second side K of the ring billet section; the ending coordinates (b0, h0) of the "S"-shaped rolling curve are... f h f () is the intersection of the upper side j and the second side k of the ring section.

[0019] Preferably, the height h0 of the ring blank, the wall thickness b0, and the height h of the ring piece are determined. f Wall thickness b fThe specific process is as follows:

[0020] Obtain the dimensions of the formed ring, including the outer diameter D of the ring. f Ring height h f Ring wall thickness b f Then, the dimensions of the ring blank are calculated, including the outer diameter D0, height h0, and wall thickness b0.

[0021] The wall thickness b0 of the ring blank is determined by equation (4):

[0022]

[0023] The height h0 of the ring blank is determined by equation (5):

[0024] h0=ψb f h f / b0 (5)

[0025] The outer diameter D0 of the ring blank is determined by equation (6):

[0026] D0=(D f -b f )b f h f / h0b0+b0 (6)

[0027] Wherein, the rolling ratio Ψ = b0h0 / b f h f , radial-axial distribution ratio tanα=(h0-h f ) / (b0-b f ).

[0028] Preferably, the process for determining the coefficient k of the "S"-shaped rolling curve is as follows:

[0029] When the axial deformation of the ring during bidirectional rolling is concentrated in the second half of the rolling process, k∈(0.5,1) is selected, and the "S"-shaped rolling curve is "upper bias".

[0030] When the axial deformation of the ring during bidirectional rolling is concentrated in the first half of the rolling process, k∈(0,0.5) is selected, and the "S"-shaped rolling curve is "downward biased".

[0031] When the axial and radial deformation amounts in the bidirectional rolling process of the ring are evenly distributed in the first and second halves of the rolling process, k = 0.5 is selected, and the "S"-shaped rolling curve is "centralized".

[0032] In a second aspect, the present invention provides an electronic device comprising: a memory and at least one processor, wherein the memory stores a computer program; the at least one processor invokes the computer program in the memory to cause the electronic device to perform the method described above for determining the "S"-shaped rolling curve of a large ring bidirectional rolling mill.

[0033] In a third aspect, the present invention provides a computer-readable storage medium storing a computer program, characterized in that, when executed by a processor, the computer program implements the method for determining the "S"-shaped rolling curve of a large ring bidirectional rolling mill as described above.

[0034] The beneficial effects of this invention are: the method for determining the "S"-shaped rolling curve of the bidirectional rolling of the large ring, the electronic device, and the storage medium, firstly, by determining the size D of the forming ring. f h f b f Given the ring billet dimensions D0, h0, and b0, the starting coordinates (b0, h0) and ending coordinates (b0, h0) of the "S"-shaped rolling curve are obtained. f h f Then, the simple function form of the quadratic rational fraction is used to describe the "S"-shaped rolling curve of the bidirectional rolling of the large ring piece; finally, the boundary conditions of the "S"-shaped rolling curve equation are determined, and the value of the "S"-shaped rolling curve coefficient k is determined in the range of (0,1). Then, the undetermined coefficients of the "S"-shaped rolling curve equation are solved, and the corresponding "S"-shaped rolling curve equation can be determined, thereby drawing the graph of the "S"-shaped rolling curve.

[0035] The "S"-shaped rolling curve determined by this method divides the rolling process into three stages that correspond to the bidirectional rolling process of the ring: (1) Ring blank preparation stage. This stage is mainly radial rolling, corresponding to the upper section of the "S"-shaped rolling curve, which allows the ring blank to smoothly bite into the radial die to establish rolling motion, eliminate the non-uniformity of the ring blank wall thickness, and gradually transition to the stable rolling stage; (2) Stable rolling stage. This stage is the combined radial and axial rolling stage, corresponding to the middle section of the "S"-shaped rolling curve, which controls the uniform growth of the ring blank to alleviate the impact and collision between the ring blank and each roll, thereby improving the stability of the rolling process; (3) Rounding stage. In this stage, since the axial height dimension of the ring is basically in place, the radial rounding is the main focus, corresponding to the lower section of the "S"-shaped rolling curve, to obtain a rolled ring with high roundness quality and uniform wall thickness.

[0036] The method for determining the "S"-shaped rolling curve is more suitable for the bidirectional rolling forming process of large ring parts, which is conducive to coordinating and controlling the movement of the rolls and the rolling process, realizing the radial and axial coordinated deformation of the ring parts in the bidirectional rolling process, and improving the stability of the rolling process. At the same time, the "S"-shaped rolling curve is described by a simple function form of a quadratic rational fraction, which is concise and easy to calculate. On the other hand, the "S"-shaped rolling curve coefficient k (k takes a value between 0 and 1) is introduced to control the shape of the "S"-shaped rolling curve, including the "upper deviation", "central deviation" and "lower deviation" shapes. This method is particularly suitable for the development and application of CNC systems in modern advanced CNC ring rolling equipment, and provides an important method and technical foundation for the integrated forming and manufacturing of large ring parts made of difficult-to-deform materials. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 This is a flowchart illustrating the process of determining the "S"-shaped rolling curve in the bidirectional rolling process of a ring component according to the present invention.

[0039] Figure 2 This invention relates to the geometric configuration and coordinate system of the ring cross-section before and after deformation during the bidirectional rolling process of the ring;

[0040] Figure 3 The figure is an "S"-shaped rolling curve drawn according to the method for determining the "S"-shaped rolling curve of the present invention.

[0041] The markings in the figure are: 1. Ring billet section; 2. Ring section; 3. "S" shaped rolling curve of "upper bias"; 4. "S" shaped rolling curve of "central bias"; 5. "S" shaped rolling curve of "lower bias". Detailed Implementation

[0042] Example 1

[0043] like Figure 1 As shown, a method for determining the "S"-shaped rolling curve in the bidirectional rolling process of large ring parts is described, with the following specific steps:

[0044] Step 1: Establish the geometric configuration and coordinate system of the ring blank section 1 before deformation and the ring section 2 after deformation during the bidirectional rolling process.

[0045] like Figure 2 As shown, the ring blank section 1 is a rectangle formed by the first side I, the upper side J, the second side K and the lower side L; the ring piece section 2 is a rectangle formed by the first side i, the upper side j, the second side k and the lower side l.

[0046] like Figure 2As shown, the geometric configurations of the ring blank section 1 before deformation and the ring section 2 after deformation in the bidirectional rolling process are as follows: the first side I of the ring blank section 1 partially coincides with the first side i of the ring section 2; the lower side L of the ring blank section 1 partially coincides with the lower side l of the ring section 2.

[0047] like Figure 2 As shown, the coordinate system of the ring billet section 1 and the ring piece section 2 in the bidirectional rolling process is as follows: the origin O is the intersection of the first side I of the ring billet section 1 and the lower side L of the ring billet section 1; the x-axis is the line containing the lower side L of the ring billet section 1, which represents the wall thickness during the deformation process of the ring billet; and the y-axis is the line containing the first side I of the ring billet section 1, which represents the height during the deformation process of the ring billet.

[0048] Figure 2 The D shown f h f b f These represent the outer diameter, height, and wall thickness of the ring; D0, h0, and b0 represent the outer diameter, height, and wall thickness of the ring blank, respectively. Therefore, in Figure 2 The geometric configurations of the ring blank section 1 and the ring piece section 2 shown, in the coordinate system formed by the x-axis and y-axis, indicate that the intersection of the upper side J and the second side K of the ring blank section 1 is the starting point coordinate (b0, h0) of the "S"-shaped rolling curve, and the intersection of the upper side j and the second side k of the ring piece section 2 is the ending point coordinate (b0, h0) of the "S"-shaped rolling curve. f h f ).

[0049] Step 2: Establish the equation for the "S"-shaped rolling curve.

[0050] Establish the equation of the "S"-shaped rolling curve in the coordinate system established in step one, from the starting point (b0, h0) to the ending point (b0, h0) of the "S"-shaped rolling curve determined in step one. f h f Between these two equations, the "S"-shaped rolling curve of the bidirectional rolling process of large ring parts is described by a simple functional form of a quadratic rational fraction as shown in equation (1):

[0051] h = h f +[a1(bb f ) 2 +a2(bb f )+a3]) / [a4(bb f ) 2 +a5(bb f )+1] (1)

[0052] In equation (1), h is the instantaneous height of the ring that changes continuously during the forming process; b is the instantaneous wall thickness of the ring that changes continuously during the forming process. f b fThese represent the final height and wall thickness of the ring after forming; a1, a2, a3, a4, and a5 are all undetermined coefficients.

[0053] Step 3: Determine the boundary conditions for the equation of the "S"-shaped rolling curve.

[0054] The “S”-shaped rolling curve passes through the starting point (b0, h0) and the ending point (b0, h0). f h f ), and at the starting point (b0, h0) and the ending point (b f h f The slope at point (b) is 0; furthermore, the "S"-shaped rolling curve passes through point (b) f +(b0-b f ) / 2, h f +k(h0-h f Substituting the above boundary conditions into formula (1), we can determine the equation shown in formula (2):

[0055]

[0056] In equation (2), k is the introduced "S"-shaped rolling curve coefficient, which is used to describe the proportion of the ring billet height deformation to the total height deformation when the ring billet wall thickness reduction reaches half of the total wall thickness reduction in the ring rolling process. The value range of k is (0, 1).

[0057] Step 4: Determine the height h0 of the ring blank, the wall thickness b0, and the height h of the ring component. f Wall thickness b f And the coefficient k of the "S"-shaped rolling curve.

[0058] Based on the boundary conditions in step three, we obtain the following system of equations:

[0059]

[0060] When solving the system of equations (3), it is necessary to first determine the height h0 of the ring blank, the wall thickness b0, and the height h of the ring piece. f Wall thickness b f And the coefficient k of the "S"-shaped rolling curve.

[0061] The determination of the ring blank height h0, wall thickness b0, and ring member height h0 is described. f Wall thickness b f The process is as follows:

[0062] The method for determining the radial and axial rolling blank size of a ring is disclosed in Chinese invention patent CN101829686, based on the formed ring size D. f h f b fThe dimensions of the ring blank, D0, h0, and b0, are obtained.

[0063] The wall thickness b0 of the ring blank is determined by equation (4):

[0064]

[0065] The height h0 of the ring blank is determined by equation (5):

[0066] h0=ψb f h f / b0 (5)

[0067] The outer diameter D0 of the ring blank is determined by equation (6):

[0068] D0=(D f -b f )b f h f / h0b0+b0 (6)

[0069] In the above formulas, the rolling ratio Ψ = b0h0 / b f h f , radial-axial distribution ratio tanα=(h0-h f ) / (b0-b f ).

[0070] Because the method for determining the radial and axial rolled blank size of a ring disclosed in Chinese Patent No. CN101829686 is based on the rolling ratio Ψ and the radial and axial deformation distribution ratio tanα, the final ring size is obtained, including the outer diameter D of the ring. f , inner diameter d f Height h f Wall thickness b f and the core roller diameter d m This allows for the rapid determination of the rolling ratio Ψ and the range of values ​​for the radial-axial deformation distribution ratio tanα. By selecting values ​​within the determined range, the dimensions of the ring blank, including outer diameter D0, inner diameter d0, height h0, and wall thickness b0, can be quickly determined. For rolling a specific ring, this method can design a series of blanks with different rolling ratios Ψ and different radial-axial deformation distribution ratios tanα.

[0071] In one specific embodiment, the obtained forming ring size is D. f It is 5040.0 mm, h f It is 350.0 mm, b f The diameter is 130.0 mm. In this embodiment, the rolling ratio Ψ = 2.5 and the radial-axial distribution ratio tanα = 0.3 are taken. Then, according to equations (4), (5), and (6), the ring blank dimensions b0 is 286.5 mm, h0 is 397.0 mm, and D0 is 2250.5 mm.

[0072] The process of determining the coefficient k of the "S"-shaped rolling curve is as follows:

[0073] When the axial deformation of the ring during bidirectional rolling is concentrated in the second half of the rolling process, k∈(0.5,1) is selected, and the "S"-shaped rolling curve is "upper bias"; when the axial deformation of the ring during bidirectional rolling is concentrated in the first half of the rolling process, k∈(0,0.5) is selected, and the "S"-shaped rolling curve is "lower bias"; when the axial deformation and radial deformation of the ring during bidirectional rolling are evenly distributed in the first and second halves of the rolling process, k=0.5 is selected, and the "S"-shaped rolling curve is "central".

[0074] like Figure 3 As shown, the curve coefficient k of the "S"-shaped rolling curve 3 (upper-biased), the "S"-shaped rolling curve 4 (central), and the "S"-shaped rolling curve 5 (lower-biased) takes values ​​of 0.75, 0.5, and 0.25, respectively.

[0075] Step 5: Solve for the undetermined coefficients in the equation of the "S"-shaped rolling curve.

[0076] The ring blank height h0, wall thickness b0, and ring height h obtained in step four above are used as the basis for determining the ring blank height h0, wall thickness b0, and ring height h. f Wall thickness b f Substituting the coefficient k of the “S”-shaped rolling curve into formula (3), the values ​​of the undetermined coefficients a1, a2, a3, a4, and a5 can be obtained.

[0077] Step 6: Draw the “S” shaped rolling curve.

[0078] Substituting the values ​​of coefficients a1, a2, a3, a4, and a5 obtained in step five into formula (1), we obtain the equations for the "S"-shaped rolling curves of the "upper-biased", "central", and "lower-biased" shapes, as follows:

[0079] ① Equation of the "S"-shaped rolling curve for "upper-biased" type:

[0080]

[0081] ② Equation of the "S"-shaped rolling curve for the "centralized" shape:

[0082]

[0083] ③ Equation of the "S"-shaped rolling curve for the "lower bias" type:

[0084]

[0085] The graphs of the "S"-shaped rolling curve equations described by equations (7), (8), and (9) were plotted using Matlab, as shown in the attached figure. Figure 3The three "S"-shaped rolling curves are shown.

[0086] Example 2

[0087] A second objective of this invention is to provide an electronic device comprising: a memory and at least one processor, wherein the memory stores a computer program; the at least one processor invokes the computer program in the memory to cause the electronic device to execute the method for determining the "S"-shaped rolling curve of a large ring bidirectional rolling mill as described in Embodiment 1.

[0088] Example 3

[0089] A third objective of this invention is to provide a computer-readable storage medium storing a computer program, characterized in that, when executed by a processor, the computer program implements the method for determining the "S"-shaped rolling curve of a large ring bidirectional rolling mill as described in Embodiment 1.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for determining the "S" shaped rolling curve for two-way rolling of large ring pieces, characterized in that, It comprises the following steps: Step one, establishing the geometric configuration and coordinate system of the ring blank section before deformation and the ring section after deformation in the two-way ring rolling process; wherein, D f , h f , b f are respectively the outer diameter, height and wall thickness of the ring; D0, h0, b0 are respectively the outer diameter, height and wall thickness of the ring blank, so that the starting point coordinates of the "S" shaped rolling curve are (b0, h0), and the end point coordinates of the "S" shaped rolling curve are (b f , h f ) Step two, establishing the equation of the "S" shape rolling curve; in the geometric configuration and coordinate system of the ring blank cross section before deformation and the ring cross section after deformation established in step one, the curve equation of the "S" shape rolling curve is determined by the quadratic rational fraction shown in formula (1): h = h f + [a1(b-b f ) 2 + a2(b-b f ) + a3] / [a4(b-b f ) 2 + a5(b-b f ) + 1] (1) wherein, h in formula (1) is the instantaneous height of the ring during the forming process; b is the instantaneous wall thickness of the ring during the forming process, h f , b f are the final height and wall thickness of the ring after forming, respectively; a1, a2, a3, a4, a5 are all undetermined coefficients; Step 3: Determine the boundary conditions for the equation of the "S"-shaped rolling curve; the boundary conditions are the coordinate points through which the "S"-shaped rolling curve passes in the coordinate system, including the starting point (b0, h0) and the ending point (b0, h0). f h f ), waypoints (b) f +(b0-b f ) / 2, h f +k(h0-h f The curve starts at (b0, h0) and ends at (b0, h0). f h f The slope at () is 0; where k is the introduced "S"-shaped rolling curve coefficient, used to describe the proportion of the ring billet height deformation to the total height deformation when the ring billet wall thickness reduction reaches half of the total wall thickness reduction in the ring rolling process. The value range of K is (0, 1). Step four, determine the height h0, wall thickness b0 of the ring blank and the height h of the ring f , wall thickness b f , and the "S" shape rolling curve coefficient k; Step five, solving the undetermined coefficients in the "S" shape rolling curve equation; Step six, drawing the "S" shape rolling curve graph.

2. A method of determining an "S" shaped rolling profile for bi-directional rolling of a large ring according to claim 1, wherein, The ring blank cross section is a rectangle surrounded by a first side I, an upper side J, a second side K and a lower side L; the ring cross section is a rectangle surrounded by a first side i, an upper side j, a second side k and a lower side l; wherein the first side I of the ring blank cross section partially coincides with the first side i of the ring cross section; the lower side L of the ring blank cross section partially coincides with the lower side l of the ring cross section.

3. The method for determining the "S" shaped rolling profile for bi-directional rolling of large ring segments according to claim 2, wherein, The starting point coordinate (b0, h0) of the "S" shaped rolling curve is the intersection of the upper edge J and the second side edge K of the ring blank section; and the ending point coordinate (b f , h f ) of the "S" shaped rolling curve is the intersection of the upper edge j and the second side edge k of the ring section.

4. The method for determining "S" shaped rolling profile for bi-directional rolling of large ring as claimed in claim 1 wherein, determining the height h0, the wall thickness b0 of the ring blank and the height h of the ring f , the wall thickness b f The specific process is as follows: Obtaining the dimensions of the shaped ring, including the ring outer diameter D f , the ring height h f , the ring wall thickness b f , and calculating the dimensions of the ring blank, including the ring blank outer diameter D0, the ring blank height h0, the ring blank wall thickness b0; Wherein, the ring blank wall thickness b0 is determined by formula (4): The ring blank height h0 is determined by formula (5): h0= ψb f h f / b0 (5) The ring blank outer diameter D0 is determined by formula (6): D0 = (D f -b f )b f h f / h0b0+b0 (6) wherein the rolling ratio Ψ = b0h0 / b f h f , the radial-axial distribution ratio tan α = (h0-h f ) / (b0-b f ).

5. The method for determining "S" shaped rolling profile for bi-directional rolling of large ring as claimed in claim 1 wherein, The process of determining the "S" shape rolling curve coefficient k is as follows: When the axial deformation of the ring double-direction rolling process is concentrated in the second half of the rolling process, select k∈(0.5, 1), the "S" shape rolling curve is "upwardly biased shape"; When the axial deformation of the ring double-direction rolling process is concentrated in the first half of the rolling process, select k∈(0, 0.5), the "S" shape rolling curve is "downwardly biased shape"; When the axial deformation and the radial deformation of the ring double-direction rolling process are evenly distributed in the first and second halves of the rolling process, select k=0.5, the "S" shape rolling curve is "centered shape".

6. An electronic device, comprising: The electronic device comprises a memory and at least one processor, the memory stores a computer program; the at least one processor calls the computer program in the memory to make the electronic device execute the determination method of the "S" shape rolling curve of the large ring double-direction rolling as claimed in any one of claims 1 to 5.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that The computer program is executed by the processor to realize the determination method of the "S" shape rolling curve of the large ring double-direction rolling as claimed in any one of claims 1 to 5.

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