Determination method for two-way rolling S-shaped rolling curve of large ring piece, electronic equipment and storage medium

Abstract

The invention provides a method for determining an S-shaped rolling curve of bidirectional rolling of a large ring piece, electronic equipment and a storage medium, which are applied to the technical field of ring piece rolling forming machining and comprise the following steps: step 1, establishing geometric configurations and coordinate systems of a ring blank section before deformation and a ring piece section after deformation in the bidirectional rolling process of the ring piece; step 2, establishing an equation of an S-shaped rolling curve; 3, determining boundary conditions of the S-shaped rolling curve equation; 4, the height h0 and the wall thickness b0 of the ring blank, the height hf and the wall thickness bf of the ring piece and the S-shaped rolling curve coefficient k are determined; 5, solving an undetermined coefficient in the S-shaped rolling curve equation; and 6, drawing an S-shaped rolling curve graph. The motion and rolling process of the rollers can be coordinated and controlled, radial and axial coordinated deformation of the ring piece in the two-way rolling process is achieved, and the stability of the rolling process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ring rolling forming processing, and specifically relates to a method for determining an "S"-shaped rolling curve of bidirectional rolling of a large ring, an electronic device, and a storage medium. Background Art

[0002] The rolling curve describes the instantaneous distribution relationship between the radial deformation and the axial deformation during the bidirectional rolling of the ring, which in turn determines the deformation history of the ring rolling forming process and the roller motion trajectory. Therefore, it plays an important role in the coordinated control of the roller motion, 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 issues that need to be urgently solved in the design and development of modern advanced CNC ring rolling equipment control systems. Therefore, the form of the rolling curve and its determination method are one of the most important core technologies for bidirectional rolling of rings of aviation difficult-to-deform materials (titanium alloys, high-temperature alloys, etc.).

[0004] The Chinese invention patent with announcement number CN104156499 discloses a method for determining the rolling curve of the bidirectional rolling process of rings, specifically a method for determining the "convex", "straight" and "concave" rolling curves based on the description of the power exponential function, which is of great significance for overcoming the shortcomings of the prior art that the determination of the rolling curve relies on experience and lacks a scientific determination method. However, the above method shows in practical applications that these three types of rolling curve forms are not well adapted to the rolling process of large rings, and the determination process of the power exponent in the rolling curve function involved in the method is complicated, which is not convenient for application in the control system 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 in bidirectional rolling process of rings made of difficult-to-deform materials, Journal of Mechanical Engineering, 2014, 50(16): 83-88", the advantages of "convex" and "concave" rolling curves for bidirectional rolling of titanium alloy rectangular rings are comprehensively considered, and an "S"-shaped rolling curve is formed by combining the "convex" and "concave" rolling curves, and a piecewise power exponential function is used to describe the "S"-shaped rolling curve. However, this method has the following problems: (1) The rolling curve The linear 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 exponential function lacks a 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 apply to the CNC system of modern advanced CNC ring rolling equipment, making it difficult to achieve coordinated control of the rolling process.

[0006] At the same time, the bidirectional rolling process of large rings is usually divided into three stages: (1) the ring blank regularization stage. (2) the stable rolling stage. (3) the rounding stage. However, the "convex", "straight" and "concave" rolling curves mentioned in the above patent (Announcement No. CN104156499) are not suitable for the purposes and requirements of the three stages of large ring rolling, and are difficult to apply to the development of modern advanced CNC ring rolling equipment CNC systems; and the "S"-shaped rolling curve design method described by a piecewise power exponential function mentioned in the above document is not universal and lacks specific basis and method for determining the power exponent, so it is not suitable for the development and application of modern advanced CNC ring rolling equipment CNC systems. Summary of the invention

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

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

[0009] Step 1: Establish the geometric configuration and coordinate system of the cross section of the ring blank before deformation and the cross section of the ring after deformation during the bidirectional rolling process of the ring; wherein, set D f 、h f , b f are the outer diameter, height and wall thickness of the ring respectively; D0, h0 and b0 are 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 end coordinates of the "S" shaped rolling curve are (b f ,h f );

[0010] Step 2, establishing an equation for an "S"-shaped rolling curve; under the geometric configuration and coordinate system of the ring blank cross section before deformation and the ring cross section after deformation during the ring bidirectional rolling process established in step 1, the curve equation of the "S"-shaped rolling curve is determined by the quadratic rational fraction shown in formula (1):

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

[0012] In formula (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, and h f 、b f are the final height and wall thickness of the ring after forming; a1, a2, a3, a4, and a5 are all unknown coefficients;

[0013] Step 3: Determine the boundary conditions of the "S"-shaped rolling curve equation; the boundary conditions are the coordinate points that the "S"-shaped rolling curve passes through in the coordinate system, including the starting point (b0, h0), the end point (b f ,h f ), waypoints (b f +(b0-b f ) / 2,h f +k(h0-h f )), and the starting point (b0, h0) and the end point (b f ,h f ) is 0; where 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 during the ring rolling process, and 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 f 、Wall thickness b f , and the “S” shaped rolling curve coefficient k;

[0015] Step 5, solving the undetermined coefficients in the "S"-shaped rolling curve equation;

[0016] Step six, draw an “S” shaped rolling curve graph.

[0017] Preferably, the cross-section of the ring blank is a rectangle surrounded by the first side I, the upper side J, the second side K and the lower side L; the cross-section of the ring component is a rectangle surrounded 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 cross-section of the ring blank partially overlaps with the first side i of the cross-section of the ring component; the lower side L of the cross-section of the ring blank partially overlaps with the lower side l of the cross-section of the ring component.

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

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

[0020] Get the dimensions of the formed ring, including the outer diameter D of the ring f , Ring height h f , Ring wall thickness b f , and then calculate the size of the ring blank, including the outer diameter D0 of the ring blank, the height h0 of the ring blank, and the wall thickness b0 of the ring blank;

[0021] Among them, the ring blank wall thickness b0 is determined by formula (4):

[0022]

[0023] The ring blank height h0 is determined by formula (5):

[0024] h0=ψb f h f / b0 (5)

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

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

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

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

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

[0030] When the axial deformation of the ring bidirectional rolling process 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 deformation and radial deformation of the ring in the bidirectional rolling process are evenly distributed in the front and rear halves of rolling, k=0.5 is selected, and the "S"-shaped rolling curve is "centered".

[0032] The second aspect of the present invention proposes an electronic device, which includes: a memory and at least one processor, wherein the memory stores a computer program; the at least one processor calls the computer program in the memory so that the electronic device executes the method for determining the "S"-shaped rolling curve of bidirectional rolling of large rings as described above.

[0033] The third aspect of the present invention proposes a computer-readable storage medium, on which a computer program is stored, characterized in that when the computer program is executed by a processor, it implements the method for determining the "S"-shaped rolling curve of bidirectional rolling of large rings as mentioned above.

[0034] The beneficial effects of the present invention are as follows: the method for determining the "S"-shaped rolling curve of the large ring bidirectional rolling, the electronic device, and the storage medium, firstly, by determining the size D of the formed ring f 、h f , b f As well as the ring blank dimensions D0, h0, b0, the starting point coordinates (b0, h0) and the end point coordinates (b0, h0) of the "S" shaped rolling curve are obtained. f ,h f ); then, a simple function form of quadratic rational fraction is used to describe the "S"-shaped rolling curve of large ring bidirectional rolling; 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 within the range of (0, 1), and 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 coincide with the bidirectional rolling process of the ring: (1) the ring billet regularization stage. This stage is mainly radial rolling, corresponding to the upper section of the "S"-shaped rolling curve, so that the ring billet can smoothly bite into the radial hole type to establish rolling movement, eliminate the uneven wall thickness of the ring billet, and gradually transition to the stable rolling stage; (2) the stable rolling stage. This stage is a radial and axial combined rolling stage, corresponding to the middle section of the "S"-shaped rolling curve, controlling the uniform growth of the ring billet to alleviate the impact and collision between the ring billet and each roller, thereby improving the stability of the rolling process; (3) the rounding stage. In this stage, because the axial height dimension of the ring is basically in place, radial rounding is mainly used, 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 determination method of the "S"-shaped rolling curve is more suitable for the bidirectional rolling forming process of large rings, is conducive to the coordinated control of the movement of the rollers and the rolling process, realizes the coordinated radial and axial deformation of the rings in the bidirectional rolling process, and improves the stability of the rolling process; at the same time, the "S"-shaped rolling curve is described in the form of a simple function of a quadratic rational fraction, and the curve equation is concise and easy to calculate; on the other hand, the "S"-shaped rolling curve coefficient k (k is between 0 and 1) is introduced to adjust the shape of the "upper deviation", "centering shape" and "lower deviation" of the "S"-shaped rolling curve, which is particularly suitable for the development and application of CNC systems of modern advanced CNC ring rolling equipment, and provides an important method and technical basis for the integrated forming and manufacturing of large rings of difficult-to-deform materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 It is a flowchart of determining an "S"-shaped rolling curve in a bidirectional rolling process of a ring according to the present invention;

[0039] Figure 2 It is the geometric configuration and coordinate system of the cross section of the ring before and after deformation in the bidirectional rolling process of the ring of the present invention;

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

[0041] Markings in the figure are: 1. Ring blank cross section; 2. Ring part cross section; 3. "Upward biased" "S" shaped rolling curve; 4. "Central shape" "S" shaped rolling curve; 5. "Downward biased" "S" shaped rolling curve. DETAILED DESCRIPTION

[0042] Embodiment 1

[0043] like Figure 1 As shown, a method for determining an "S"-shaped rolling curve in a bidirectional rolling process of a large ring is described, and the specific steps are as follows:

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

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

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

[0047] like Figure 2 As shown, the coordinate system of the ring section 1 and the ring section 2 during the bidirectional rolling process of the ring is: the intersection of the first side I of the ring section 1 and the lower side L of the ring section 1 is taken as the coordinate origin O, the straight line where the lower side L of the ring section 1 is located is taken as the x-axis, representing the wall thickness of the ring during the deformation process; the straight line where the first side I of the ring section 1 is located is taken as the y-axis, representing the height of the ring during the deformation process.

[0048] Figure 2 D shown in f 、h f 、b f are the outer diameter, height and wall thickness of the ring respectively; D0, h0 and b0 are the outer diameter, height and wall thickness of the ring blank respectively. Figure 2 The geometric configuration of the ring blank cross section 1 and the ring part cross section 2 shown in the coordinate system formed by the x-axis and the y-axis, the intersection of the upper side J of the ring blank cross section 1 and the second side K is the starting coordinate (b0, h0) of the "S"-shaped rolling curve, and the intersection of the upper side j of the ring part cross section 2 and the second side k is the end coordinate (b f ,h f ).

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

[0050] The equation of the "S"-shaped rolling curve is established in the coordinate system established in step 1, from the starting point (b0, h0) to the end point (b f ,h f ), the “S”-shaped rolling curve of the bidirectional rolling process of large rings is described by the simple function form of the quadratic rational fraction shown in formula (1):

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

[0052] In formula (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, and h f 、b fare the final height and wall thickness of the ring after forming; a1, a2, a3, a4, and a5 are all unknown coefficients.

[0053] Step three, determine the boundary conditions of the "S"-shaped rolling curve equation.

[0054] The “S” shaped rolling curve passes through the starting point (b0, h0) and the end point (b f ,h f ), and at the starting point (b0, h0) and the end point (b f ,h f ) is 0; in addition, the “S” shaped rolling curve passes through the passing 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 formula (2), k is the introduced "S"-shaped rolling curve coefficient, which is used to describe the proportion of the ring blank height deformation to the total height deformation when the ring blank wall thickness reduction reaches half of the total wall thickness reduction in the ring rolling process, where 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 f 、Wall thickness b f , and the “S” shaped rolling curve coefficient k.

[0058] According to the boundary conditions in step 3, the following set of equations is obtained:

[0059]

[0060] When solving the equation system of formula (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 f 、Wall thickness b f , and the “S” shaped rolling curve coefficient k.

[0061] Determine the height h0 of the ring blank, the wall thickness b0 and the height h of the ring f 、Wall thickness b f The process is:

[0062] A method for determining the radial and axial rolling blank size of a ring disclosed in the Chinese invention patent with authorization announcement number CN101829686 is used, according to the size D of the formed ring. f 、h f 、b fThe ring blank dimensions D0, h0, and b0 are obtained.

[0063] Among them, the ring blank wall thickness b0 is determined by formula (4):

[0064]

[0065] The ring blank height h0 is determined by formula (5):

[0066] h0=ψb f h f / b0 (5)

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

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

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

[0070] Since a method for determining the radial-axial rolling blank size of a ring disclosed in the Chinese patent with the authorization announcement number CN101829686 is a method for determining the radial-axial blank size of a ring based on the rolling ratio Ψ and the radial-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 , the range of rolling ratio Ψ and radial-axial deformation distribution ratio tanα can be quickly determined. Then, by taking values ​​within the determined range, the size of the ring blank can be quickly determined, including the outer diameter D0, inner diameter d0, height h0, and wall thickness b0. This method can design a series of blanks with different rolling ratios Ψ and different radial-axial deformation distribution ratios tanα for rolling a certain ring.

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

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

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

[0074] like Figure 3 As shown, the curve coefficient k of the "upward-biased" "S"-shaped rolling curve 3, the "center-shaped" "S"-shaped rolling curve 4, and the "downward-biased" "S"-shaped rolling curve 5 are 0.75, 0.5, and 0.25, respectively.

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

[0076] The ring blank height h0, wall thickness b0 and ring height h obtained in step 4 above are f 、Wall thickness b f And the "S"-shaped rolling curve coefficient k is substituted into formula (3) to solve the values ​​of the unknown coefficients a1, a2, a3, a4, and a5.

[0077] Step six, draw an “S” shaped rolling curve graph.

[0078] Substituting the values ​​of coefficients a1, a2, a3, a4, and a5 obtained in step 5 into formula (1), the equations of the "upper biased shape", "centering shape", and "lower biased shape" of the "S"-shaped rolling curve are obtained as follows:

[0079] ① "S" shaped rolling curve equation of "upper bias":

[0080]

[0081] ② “Center-shaped” “S” shaped rolling curve equation:

[0082]

[0083] ③ "S" shaped rolling curve equation of "downward deviation":

[0084]

[0085] Matlab is used to draw the graph of the “S” shaped rolling curve equation described by equations (7), (8) and (9), and the following is obtained: Figure 3Three "S" shaped rolling curves are shown.

[0086] Embodiment 2

[0087] The second object of the present 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 calls the computer program in the memory so that the electronic device executes the method for determining the "S"-shaped rolling curve of large ring bidirectional rolling as described in Example 1.

[0088] Embodiment 3

[0089] The third object of the present invention is to provide a computer-readable storage medium, on which a computer program is stored, characterized in that when the computer program is executed by a processor, it implements the method for determining the "S"-shaped rolling curve of large ring bidirectional rolling as described in Example 1.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining an "S"-shaped rolling curve for bidirectional rolling of large rings, characterized in that: The steps include: Step 1: Establish the geometric configuration and coordinate system of the cross section of the ring blank before deformation and the cross section of the ring after deformation during the bidirectional rolling process of the ring; wherein, set D f 、h f , b f are the outer diameter, height and wall thickness of the ring respectively; D0, h0 and b0 are 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 end coordinates of the "S" shaped rolling curve are (b f ,h f ); Step 2, establishing the equation of the "S"-shaped rolling curve; under the geometric configuration and coordinate system of the ring blank cross section before deformation and the ring cross section after deformation during the ring bidirectional rolling process established in step 1, the curve equation of the "S"-shaped 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) In formula (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, and h f , b f are the final height and wall thickness of the ring after forming; a1, a2, a3, a4, and a5 are all unknown coefficients; Step 3: Determine the boundary conditions of the "S"-shaped rolling curve equation; the boundary conditions are the coordinate points that the "S"-shaped rolling curve passes through in the coordinate system, including the starting point (b0, h0), the end point (b f ,h f ), waypoints (b f +(b0-b f ) / 2,h f +k(h0-h f )), and the starting point (b0, h0) and the end point (b f ,h f ) is 0; where 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 during the ring rolling process, and the value range of K is (0, 1); Step 4: Determine the height h0 of the ring blank, the wall thickness b0 and the height h of the ring f 、Wall thickness b f , and "S" rolling curve coefficient k; Step 5, solving the undetermined coefficients in the "S" shaped rolling curve equation; Step six, draw an "S" shaped rolling curve graph.

2. The method for determining the "S"-shaped rolling curve of large ring bidirectional rolling according to claim 1 is characterized in that: The cross-section of the ring blank is a rectangle surrounded by a first side I, an upper side J, a second side K and a lower side L; the cross-section of the ring component 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 cross-section of the ring blank partially overlaps with the first side i of the cross-section of the ring component; and the lower side L of the cross-section of the ring blank partially overlaps with the lower side l of the cross-section of the ring component.

3. The method for determining the "S"-shaped rolling curve of large ring bidirectional rolling according to claim 2 is characterized in that: The starting coordinates (b0, h0) of the "S" shaped rolling curve are the intersection of the upper side J and the second side K of the ring blank cross section; the end coordinates (b0, h0) of the "S" shaped rolling curve are the intersection of the upper side J and the second side K of the ring blank cross section; f ,h f ) is the intersection of the upper edge j and the second side k of the ring cross section.

4. The method for determining the "S"-shaped rolling curve of large ring bidirectional rolling according to claim 1 is characterized in that: Determine the height h0 of the ring blank, the wall thickness b0 and the height h of the ring f 、Wall thickness b f The specific process is as follows: Get the dimensions of the formed ring, including the outer diameter D of the ring f , Ring height h f , Ring wall thickness b f , and then calculate the size of the ring blank, including the outer diameter D0 of the ring blank, the height h0 of the ring blank, and the wall thickness b0 of the ring blank; Among them, 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 outer diameter D0 of the ring blank is determined by formula (6): D0=(D f -b f )b f h f / h0b0+b0 (6) Among them, rolling ratio Ψ=b0h0 / b f h f , radial-axial distribution ratio tanα=(h0-h f ) / (b0-b f ).

5. The method for determining the "S"-shaped rolling curve of large ring bidirectional rolling according to claim 1 is characterized in that: The process of determining the "S" shaped rolling curve coefficient k is as follows: When the axial deformation of the ring bidirectional rolling process is concentrated in the second half of rolling, k∈(0.5, 1) is selected, and the "S"-shaped rolling curve is "upward biased"; When the axial deformation of the ring bidirectional rolling process is concentrated in the first half of the rolling process, k∈(0,0.5) is selected, and the "S" rolling curve is "downward biased"; When the axial deformation and radial deformation of the ring in the bidirectional rolling process are evenly distributed in the front and back halves of rolling, k=0.5 is selected, and the "S"-shaped rolling curve is "centered".

6. An electronic device, characterized in that: The electronic device comprises: a memory and at least one processor, wherein a computer program is stored in the memory; the at least one processor calls the computer program in the memory so that the electronic device executes the method for determining the "S"-shaped rolling curve of large ring bidirectional rolling as described in any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the method for determining the "S"-shaped rolling curve of bidirectional rolling of large rings as described in any one of claims 1 to 5.

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