Method for determining stable forming conditions of large taper special-shaped ring disc piece during whole spinning process
By establishing the functional relationship of key process parameters throughout the rotary rolling process of large-tapered irregular-shaped ring discs, determining the range of parameter values, and adopting a constant diameter change rate as the design target, the problem of instability in the rotary rolling process was solved, and stable and precise forming of the ring discs was achieved.
Patent Information
- Application Number
- CN202610431791.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-02
- Publication Date
- 2026-06-26
AI Technical Summary
Existing technologies make it difficult to determine stable forming conditions for the entire spinning process of large-tapered irregular-shaped ring discs, leading to instability in the forming process and affecting the shape and dimensional accuracy of the ring discs.
By establishing the functional relationship between key process parameters in the entire process of rotary rolling of large-tapered irregular ring discs, reasonable value ranges of parameters such as core roll feed speed, tapered roll radial translation speed, and ring disc diameter change speed are determined. A constant diameter change speed is adopted as the process parameter design target to coordinate roll movement to achieve stable forming.
It achieves stability and precise forming in the spinning process of large-tapered irregular-shaped ring discs, avoids violent collisions between the ring discs and the rolls, and ensures the shape and dimensional accuracy of the ring discs.
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Figure CN122274058A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of rotary forming technology for ring discs, specifically relating to a method for determining stable forming conditions throughout the rotary forming process of large-tapered irregular ring discs, so as to achieve stable forming of ring discs throughout the rotary forming process. Background Technology
[0002] Large-tapered profiled ring disk components are mainly used in the front and rear joints of high-end equipment such as rockets and missiles, and are key components connecting the engine casing and nozzle. The spinning-rolling composite process is a novel process method proposed for the forming and manufacturing of large-tapered profiled ring disk components (Li XC, Chen XQ, Guo LG, et al. An innovative spinning-rolling process and its intelligent FE modelling for big-tapered profiled ring disk. Journal of Material Processing Technology 2022, 310:117772.). To successfully establish the spinning-rolling forming process, the theoretical model of stable forming conditions for the spinning bending process established by previous researchers provides a certain reference for the design of process parameters throughout the spinning-rolling process (Zou SJ, Li XC, Li Fei, et al. On a stable forming conditionof spinning bending process for manufacturing big-tapered profiled ring disk. International Journal of Precision Engineering and Manufacturing 2026.). Meanwhile, the rotary rolling composite process for large-tapered irregular-shaped ring discs is a complex dynamic forming process under the coupling of multiple factors. The coordinated control of the multi-roll motion is difficult, leading to severe dynamic contact and collisions between the ring disc and the rolls, thus affecting the stability of the rotary rolling process. Due to the complex cross-sectional shape and large taper of the ring disc, the radius difference at different axial positions is particularly significant, resulting in a very small contact area between the ring disc and the main roll. During the forming process, collisions easily cause defects such as ellipticity and distortion, severely affecting the shape and dimensional accuracy of the formed ring disc. Therefore, determining the stable forming conditions for the entire rotary rolling process of large-tapered irregular-shaped ring discs, in order to successfully establish the rotary rolling process and achieve stable forming of the ring disc, is a key problem that urgently needs to be solved in the rotary rolling composite process for ring discs.
[0003] For the radial-axial rolling process of ring parts, (Guo LG, Yang H. Towards a steady forming condition for radial–axial ring rolling. International Journal of Mechanical Sciences 2011, 53(4): 286-299) proposed a method to determine the stable forming region of radial-axial rolling of ring parts, providing a theoretical basis for the design of process parameters for radial-axial rolling of simple rectangular cross-section ring parts. However, the forming principle of the rotary rolling composite process is completely different from that of ring rolling, and its forming process is much more complex than that of ring rolling. Therefore, the above paper is not applicable to the rotary rolling forming process of large-tapered irregular ring disc parts. Summary of the Invention
[0004] To address the technical challenge of successfully establishing and achieving stable and precise forming of large-tapered irregular-shaped ring discs during the rotary rolling process, this invention proposes a method for determining stable forming conditions throughout the entire rotary rolling process of large-tapered irregular-shaped ring discs.
[0005] A method for determining stable forming conditions throughout the rotary rolling process of a large-tapered irregular-shaped ring disc part specifically includes the following steps:
[0006] Step 1: Establish the functional relationship between key process parameters throughout the entire rolling process of large-tapered irregular-shaped ring discs; the key process parameters include: the feed speed v of the mandrel during the irregular-shaped ring rolling stage. f Radial translation speed v of the conical roller w The rate of change of the diameter of the ring disk component, v D The main roller speed n1. The functional relationship between the various process parameters is determined by formula (28):
[0007]
[0008] In formula (28), v f v w v D n1 and n2 represent the core roller feed speed, the conical roller radial translation speed, the ring disc diameter change speed, and the main roller rotation speed, respectively; D f1 D is the outer diameter of the rectangular portion of the target ring disc. d R is the outer diameter of the rectangular portion of the spun ring at the initial moment of the irregular ring rolling process. 1a The radius of the large end of the main roller, R 3f and R 2f These are the outer radii of the large end of the ring disc at the start and end of the irregular ring rolling process, respectively, R. 1s Main roller small end radius, [∆S min ] max and [∆S max ]min The bite-in and roll-through conditions required for successful rolling of the tapered portion of the ring disc; ∆S min1 and ∆S max1 The bite and roll-through conditions required for successful rolling of the rectangular portion of the ring disc are ∆b. total Δb represents the total reduction in thickness of the rectangular portion. total2 Δb represents the wall thickness reduction of the ring disc component during the irregular ring rolling stage. total2 =b b0 -b bf , where b b0 and b bf These represent the initial average thickness and the final average thickness of the tapered ring during the shaped ring rolling stage, respectively.
[0009] Step 2: Determine the core roll feed speed v throughout the entire spinning process of the large-tapered irregular ring disc. f axial feed speed v of the cone roller a Radial translation speed v of the conical roller w The rate of change of the diameter of the large end of the ring-shaped component, v D The range of values for is as follows:
[0010] Core roller feed speed v f The range of values for is determined by formula (29) and the theoretical model of stable forming conditions for the swivel bending process:
[0011]
[0012] axial feed speed v of the tapered roller a The range of values is determined by the theoretical model of the stable forming conditions of the bending process:
[0013] The rate of change of the large end diameter of the ring disk component, v D The range of values is determined by formula (30) and the theoretical model of stable forming conditions for the bending process:
[0014]
[0015] radial translation speed v of the conical roller w The range of values is determined by formula (16) and the theoretical model of stable forming conditions for the swivel bending process: [Determination:]
[0016] As can be seen from the above equations, by combining the theoretical model of stable forming conditions in the swirl bending process, the core roll feed speed v during the entire swirl rolling process can be obtained. f Radial translation speed v of the conical roller w The rate of change of the diameter of the ring disk component, v D and the axial feed speed v of the upper cone roller a The reasonable range of values.
[0017] Step 3: Determine the stable forming conditions for the entire spin rolling process of the large-tapered irregular-shaped ring disc. The specific process is as follows:
[0018] From formulas (22) and (26) and the theoretical model of stable forming conditions in the swirl bending process, the allowable core roll feed speed v for the billet to achieve smooth rotation during the entire swirl rolling process is obtained. f The value range is 0.0456~4.832 mm / s;
[0019] The axial feed speed v of the conical roller is obtained from the theoretical model of stable forming conditions in the swivel bending process. a The maximum value v amax It is 2.326 mm / s;
[0020] From formulas (25) and (27) and the theoretical model of stable forming conditions for the bending process, the rate of change of the diameter v of the ring disc is obtained. D The value range is 0.483~0.851 mm / s; select v D The values were 0.483, 0.574, 0.666, 0.758, and 0.851 mm / s, respectively.
[0021] The radial translation speed v of the conical roller is obtained from formula (16) and the theoretical model of stable forming conditions in the swivel bending process. w The value range is 0.483~5.258 mm / s;
[0022] Each v is plotted using formulas (15) and (16) and the theoretical model of stable forming conditions for the swivel bending process. D The axial feed speed v of the upper conical roller under the value a Core roller feed speed v f and the radial translation speed v of the cone roller w The curves showing the instantaneous height and thickness variation of the ring disk component are shown in Figures 4(a), (b), and (c). In the figures, v... D =0.483 mm / s and v D The region enclosed by the curve corresponding to 0.851 mm / s is the region corresponding to the stable forming condition of the entire spinning process of the large taper irregular ring disc determined in this embodiment.
[0023] This invention aims to maintain a uniform change in the outer diameter of the large end of the ring disc throughout the entire spinning process. It establishes the functional relationship between key process parameters during the spinning of the large-tapered irregular-shaped ring disc, determines the value range of key process parameters for spinning forming, and thus obtains the stable forming region of the spinning-rolling composite process. In this invention, a constant diameter change rate is cleverly used to determine the mathematical relationship between key process parameters and their reasonable range. Only the dimensions (D) of the formed ring disc need to be given. f1 ×R 2f ×b f ×hf ×h f1 ×h 1f ×h 2f =578×396×42×47×82.8×11.0×30.9 mm) and the dimensions of the spin-rolled billet (D d ×D r ×b0×h0×D 01 ×h1×h2=533.5×441×46.2×47×767.3×11×30.8 mm), radius R of the large end of the main roller. 1a The friction angle κ between the roll and the billet, and the radius R of the small end of the main roll. 1s By determining the main roll speed n1, stable forming conditions can be obtained to ensure the successful establishment of the entire rotary rolling process for large-tapered irregular-shaped ring discs and to achieve stable and precise forming of the ring discs. Since the deformation behavior of the ring discs is unknown before process design, this method of establishing stable forming conditions based on reverse thinking provides a theoretical basis for optimizing the design of process parameters for rotary rolling of large-tapered irregular-shaped ring discs, and provides an important guarantee for achieving stable operation of the entire rotary rolling process and obtaining high-quality ring discs. Attached Figure Description
[0024] To aid in understanding the functional relationships in this invention and to clearly demonstrate the technical solutions implemented in this invention, the accompanying drawings involved in the implementation process are briefly described below. The following drawings are only some examples of this invention.
[0025] Figure 1 This is a schematic diagram showing the changes in the cross-section of the rectangular portion during the irregular ring rolling stage.
[0026] Figure 2 This is a schematic diagram showing the changes in the cross-section of the conical section during the irregular ring rolling stage.
[0027] Figure 3 This is a schematic diagram showing the change in the positional relationship between the tapered roll and the ring disc during the irregular ring rolling process.
[0028] Figure 4 shows the curves of roll speed as a function of instantaneous height and thickness of the ring disc during the entire rolling process of a large-tapered irregular-shaped disc: (a) Axial feed speed of the upper tapered roll v a (b) Core roller feed speed v f (c) Radial translation speed v of the conical roller w
[0029] Figure 5 A flowchart for determining the stable forming conditions of the entire spin rolling process for large-tapered irregular-shaped ring discs. Detailed Implementation
[0030] This embodiment describes a method for determining stable forming conditions throughout the rotary rolling process of a large-tapered irregular-shaped ring disc. First, with the goal of maintaining a uniform change (decrease or increase) in the outer diameter of the large end of the ring disc throughout the rotary rolling process, a functional relationship is established between the movement speeds of each roll during the entire rotary rolling process. Then, the range of values for key process parameters for forming throughout the rotary rolling process is determined. Finally, the stable forming conditions for the entire rotary rolling process are obtained. The purpose of establishing the mathematical relationship between key process parameters throughout the rotary rolling process is to obtain coordinated motion control of each roll during the entire rotary rolling process, thereby establishing a stable rotary rolling forming process.
[0031] The specific process of this embodiment is as follows:
[0032] Step 1: Establish the functional relationship between key process parameters throughout the entire spinning process of large-tapered irregular-shaped ring disc parts;
[0033] If the outer diameter of the large end of the ring disc changes at a constant rate (decreasing or increasing) throughout the entire spinning process, it can effectively avoid violent collisions between the ring disc and the various rolls during processing, thereby improving the stability of the forming process and ensuring the shape and dimensional accuracy of the ring disc. Based on this, a mathematical function relationship between key process parameters during the spinning process of the large-tapered irregular-shaped ring disc is established.
[0034] The key process parameters include: core roller feed speed v f axial feed speed v of the upper conical roller a Radial translation speed v of the conical roller w The constant diameter of the ring-shaped disk component changes (decreases or increases) at a speed v. D Main roller speed n1 and cone roller speed n a .
[0035] In this embodiment, the cross-sectional change of the rectangular portion of the spun ring disc during the irregular ring rolling stage is as follows: Figure 1 As shown. Where D d D r These are the outer and inner diameters of the rectangular portion of the spun ring disc at the initial moment of irregular ring rolling; D dt D rt , respectively, represent the outer and inner diameters of the rectangular portion of the spun-rolled ring at the instant of irregular ring rolling; h0 is the initial height of the rectangular section of the spun-rolled ring; b0, b t Let Δb and ΔD represent the thicknesses of the rectangular portion of the spun-rolled ring at the initial and instantaneous moments of the shaped ring rolling process, respectively. d These represent the decrease in thickness and the increase in outer diameter of the rectangular portion of the rotary rolled ring during the irregular ring rolling process, respectively.
[0036] In this embodiment, for ease of analysis, the conical portion MNPQ of the ring disc is simplified to a regular conical ring ABCD. The geometric structure of the conical portion of the rotary rolled ring disc during the irregular ring rolling stage is as follows: Figure 2 As shown. Where D t h is the outer diameter of the large end of the conical section of the rotary rolled ring at the instantaneous moment during the irregular ring rolling stage; s b bs , respectively, represent the axial height and instantaneous average thickness of the simplified conical ring ABCD; h1 and h2 represent the large end height and small end height of the conical portion of the spun ring disc during the irregular ring rolling stage; R bs r bs Let θ represent the instantaneous outer and inner radii of the simplified conical ring ABCD at the large end during the irregular ring rolling stage, and θ be the main roll inclination angle.
[0037] In the spin rolling process of a large-tapered irregular-shaped ring disc, if the acceleration of the diameter change at the large end of the ring disc is zero, it will maintain a uniform deformation rate. Based on this, a design objective is proposed to maintain a uniform diameter change rate at the large end of the ring disc as a key process parameter throughout the spin rolling process. In this invention, this is referred to as the "constant diameter change rate condition" for the ring disc.
[0038] If the outer diameter of the rectangular portion of the ring disc increases at a constant rate during the irregular ring rolling process, then the outer diameter of the rectangular portion can be expressed as a linear function of the forming time, i.e.
[0039]
[0040] In the formula, A1 and B1 are the constant term and the coefficient of the first-order term, respectively; t is the processing time of the irregular ring rolling stage.
[0041] According to the rolling principle, when t=0, D dt =D d When t=T, T is the total time required to complete one irregular ring rolling process, and D is the total time required to complete one irregular ring rolling process. dt =D f1 Therefore, we can obtain
[0042]
[0043] In the formula, D f1 Let be the outer diameter of the rectangular portion of the target ring disc.
[0044] Differentiating equation (2) with respect to t, we get
[0045]
[0046] In the formula, v D This indicates the constant diameter growth rate of the ring disc during the irregular ring rolling process.
[0047] Equations (2) and (3) actually describe the uniform growth behavior of the outer diameter of the rectangular portion of the ring disc during the irregular ring rolling process. Since the forming process of the ring disc is unpredictable before process design, this method of designing key process parameters based on reverse thinking can also be used to calculate the mathematical model of the key process parameters that the tapered portion needs to satisfy in the irregular ring rolling stage. Combined with the mathematical model of stable forming conditions of large-tapered irregular ring discs in the swirl bending process established by predecessors, this will provide a feasible approach for the stable forming of ring discs and the optimization design of process parameters throughout the swirl rolling process.
[0048] In this embodiment, the constant diameter change rate condition is cleverly used to determine the mathematical relationships and reasonable ranges of key process parameters throughout the rotary rolling process. Based on this, a mathematical model of stable forming conditions for the entire rotary rolling process of large-tapered irregular-shaped ring discs is established, providing a theoretical basis for the design and optimization of the rotary rolling process.
[0049] like Figure 1 As shown, during the irregular ring rolling process, the height of the rectangular portion of the ring disc remains constant. Neglecting small material deformations, based on the principle of constant volume during plastic deformation, it can be concluded that...
[0050]
[0051] Simplifying equation (4) yields
[0052]
[0053] Due to the instantaneous outer diameter D of the rectangular portion of the ring disc component dt The rate of change is the growth rate of the diameter, so v D It can be represented as
[0054]
[0055] In the formula, v f This refers to the feed speed of the mandrel during the irregular ring rolling stage.
[0056] Transforming equation (6) yields
[0057]
[0058] Assuming the time taken for the ring disc to rotate one revolution is Δt, and the feed rate of the core roller per revolution is ΔS, then we have
[0059]
[0060] Ignoring slippage between the billet and the main roller during the forming process, the linear velocities at the contact points are equal, thus yielding...
[0061]
[0062] In the formula, R1a n1 is the radius of the large end of the main roller, and n1 is the rotational speed of the main roller.
[0063] Combining equations (8) and (9), the main roller speed n1 can be obtained as follows:
[0064]
[0065] In summary, regarding the key process parameters (n1, v) of the rectangular portion during the irregular ring rolling process, f v w v D The mathematical relationship between them can be summarized as follows:
[0066]
[0067] like Figure 2 As shown, during the irregular ring rolling process, the height of the conical portion of the ring disc remains constant. Neglecting small material deformation, based on the principle of constant volume during plastic deformation, the instantaneous outer diameter D of the large end of the ring disc during rolling... t It can be represented as
[0068]
[0069] Instantaneous outer diameter D of the large end of the ring disc component t The derivative with respect to time t is the growth rate of the diameter at the large end of the ring disc. Therefore, by differentiating both sides of equation (13) with respect to time t, we can obtain the growth rate v of the diameter at the large end of the ring disc during the shaped ring rolling process. D for
[0070]
[0071] According to equation (14), the core roll feed speed v during the irregular ring rolling process is... f It can be represented as
[0072]
[0073] like Figure 3 As shown, during the irregular ring rolling process, the tapered roll continuously retracts as the outer diameter of the large end of the ring increases, ensuring axial constraint on the ring. Therefore, the radial translational speed v of the tapered roll... w The growth rate v of the ring disc diameter should be related to the growth rate of the ring disc component. D Equal, that is
[0074]
[0075] Combining equations (11), (15), and (16), the key process parameters (n1, v) for the irregular ring rolling process can be obtained. f v w v D The mathematical relationship between them can be summarized as follows:
[0076]
[0077] In order to achieve stable forming of the ring disc part throughout the entire spinning process, it is necessary to ensure the mathematical correlation of the process parameters in formula (17), and at the same time, determine the reasonable range of each key process parameter.
[0078] Step 2: Determine the core roll feed speed v of the ring disc during the irregular ring rolling stage. f Radial translation speed v of the conical roller w The constant diameter change rate v of the ring disk component D The range of values for .
[0079] Considering the plastic deformation behavior of materials during ring rolling, Hualin established the bite-in and through-thrust conditions in the ring rolling process, and its theoretical model is as follows:
[0080]
[0081]
[0082]
[0083] Where ∆S min and ∆S max These are the minimum and maximum values of the core roller feed, respectively. 2a and R 2s These are the main roller radius and the core roller radius, R. d r0 and r0 are the outer and inner radii of the ring, respectively, and κ is the friction angle between the roll and the ring.
[0084] To successfully establish a continuous spin forming process, the mandrel feed speed v f The bite-in and roll-through conditions must be met. From equations (10), (18), (19), and (20), the allowable core roll feed speed v for the smooth rolling of the rectangular portion of the ring disc can be obtained. f The range of values, i.e.
[0085]
[0086] In the formula ∆S min1 and ∆S max1 The bite-in and roll-through conditions required for the smooth rolling of the rectangular portion of the ring disc.
[0087] Therefore, we can obtain
[0088]
[0089] Let ∆b total Let be the total reduction in thickness of the rectangular portion, then we have
[0090]
[0091] In the formula b f The thickness of the rectangular portion of the target ring disc component.
[0092] Therefore, the total time T for the irregular ring rolling stage can be expressed as:
[0093]
[0094] By combining equations (3), (22), and (24), we can obtain the constant diameter change rate v. D The range of values is
[0095]
[0096] Similarly, for the rolling of tapered rings, the core roll feed speed v can be obtained from equation (22). f The range of values is
[0097]
[0098] In the formula R 3f and R 2f These are the outer radii of the large end of the ring disc at the start and end of the irregular ring rolling process, respectively, R. 1s Main roller small end radius, [∆S min ] max and [∆S max ] min The bite-in and roll-through conditions required for the successful rolling of the tapered portion of the ring disc.
[0099] This leads to the growth rate v of the large end diameter of the ring disk component. D The range of values is
[0100]
[0101] In equation (27), Δb total2 Δb represents the wall thickness reduction of the ring disc component during the irregular ring rolling stage. total2 =b b0 -b bf Among them, b b0 and b bf These represent the initial average thickness and the final average thickness of the tapered ring during the shaped ring rolling stage, respectively.
[0102] In summary, the range of values for each key process parameter during the irregular ring rolling process can be determined by the intersection of equations (22) and (25)-(27).
[0103] Step 3: Determine the stable forming conditions for the entire spin rolling process of the large-tapered irregular-shaped ring disc. The specific steps are as follows:
[0104] In this embodiment, the main roll speed n1 is set to 1.8 rad / s throughout the entire rolling process of the large-tapered irregular ring disc part, and the billet size is...
[0105] D d ×D r ×b0×h0×D 01 ×h1×h2=533.5×441×46.2×47×767.3×11×30.8 (mm), D 01 The outer diameter of the large end of the conical section of the blank is D, and the size of the formed ring disc is D. f1 ×R 2f ×b f ×h f ×h f1 ×h 1f ×h 2f =578×396×42×47×82.8×11.0×30.9 (mm).
[0106] From formulas (22) and (26) and the theoretical model of stable forming conditions in the swirl bending process, the allowable core roll feed speed v for the billet to achieve smooth rotation during the entire swirl rolling process is obtained. f The value range is 0.0456~4.832 mm / s;
[0107] The axial feed speed v of the conical roller is obtained from the theoretical model of stable forming conditions in the swivel bending process. a The maximum value v amax It is 2.326 mm / s;
[0108] From formulas (25) and (27) and the theoretical model of stable forming conditions for the bending process, the rate of change of the diameter v of the ring disc is obtained. D The value range is 0.483~0.851 mm / s; select v D The values were 0.483, 0.574, 0.666, 0.758, and 0.851 mm / s, respectively.
[0109] The radial translation speed v of the conical roller is obtained from formula (16) and the theoretical model of stable forming conditions in the swivel bending process. w The value range is 0.483~5.258 mm / s;
[0110] Each v is plotted using formulas (15) and (16) and the theoretical model of stable forming conditions for the swivel bending process. D The axial feed speed v of the upper conical roller under the value a Core roller feed speed v f and the radial translation speed v of the cone roller w The curves showing the instantaneous height and thickness variation of the ring disk component are shown in Figures 4(a), (b), and (c). In the figures, v... D=0.483 mm / s and v D The region enclosed by the curve corresponding to 0.851 mm / s is the region corresponding to the stable forming condition of the entire spinning process of the large taper irregular ring disc determined in this embodiment.
Claims
1. A method for determining the stable forming conditions throughout the entire spinning process of a large-tapered irregular-shaped ring disc, specifically including the following steps: Step 1: Establish the functional relationship between key process parameters throughout the entire rolling process of large-tapered irregular-shaped ring discs; the key process parameters include: the feed speed v of the mandrel during the irregular-shaped ring rolling stage. f Radial translation speed v of the conical roller w The rate of change of the diameter of the ring disk component, v D The main roller speed n1. The functional relationship between the various process parameters is determined by formula (28): In formula (28), v f v w v D n1 and n2 represent the core roller feed speed, the conical roller radial translation speed, the ring disc diameter change speed, and the main roller rotation speed, respectively; D f1 D is the outer diameter of the rectangular portion of the target ring disc. d R is the outer diameter of the rectangular portion of the spun ring at the initial moment of the irregular ring rolling process. 1a The radius of the large end of the main roller, R 3f and R 2f These are the outer radii of the large end of the ring disc at the start and end of the irregular ring rolling process, respectively, R. 1s Main roller small end radius, [∆S min ] max and [∆S max ] min The bite-in and roll-through conditions required for successful rolling of the tapered portion of the ring disc; ∆S min1 and ∆S max1 The bite and roll-through conditions required for successful rolling of the rectangular portion of the ring disc are ∆b. total Δb represents the total reduction in thickness of the rectangular portion. total2 Δb represents the wall thickness reduction of the ring disc component during the irregular ring rolling stage. total2 =b b0 -b bf , where b b0 and b bf These represent the initial average thickness and the final average thickness of the tapered ring during the shaped ring rolling stage, respectively. Step 2: Determine the core roll feed speed v throughout the entire spinning process of the large-tapered irregular ring disc. f axial feed speed v of the cone roller a Radial translation speed v of the conical roller w The rate of change of the diameter of the large end of the ring-shaped component, v D The range of values for is as follows: Core roller feed speed v f The range of values for is determined by formula (29) and the theoretical model of stable forming conditions for the swivel bending process: axial feed speed v of the tapered roller a The range of values is determined by the theoretical model of the stable forming conditions of the bending process; The rate of change of the large end diameter of the ring disk component, v D The range of values is determined by formula (30) and the theoretical model of stable forming conditions for the bending process: radial translation speed v of the conical roller w The range of values for is determined by formula (16) and the theoretical model of stable forming conditions for the swivel bending process: As can be seen from the above equations, by combining the theoretical model of stable forming conditions in the swirl bending process, the core roll feed speed v during the entire swirl rolling process can be obtained. f Radial translation speed v of the conical roller w The rate of change of the diameter of the ring disk component, v D and the axial feed speed v of the upper cone roller a The reasonable range of values. Step 3: Determine the stable forming conditions for the entire spin rolling process of the large-tapered irregular-shaped ring disc. The specific process is as follows: From formulas (22) and (26) and the theoretical model of stable forming conditions in the swirl bending process, the allowable core roll feed speed v for the billet to achieve smooth rotation during the entire swirl rolling process is obtained. f The value range is 0.0456~4.832 mm / s; The axial feed speed v of the conical roller is obtained from the theoretical model of stable forming conditions in the swivel bending process. a The maximum value v amax It is 2.326 mm / s; From formulas (25) and (27) and the theoretical model of stable forming conditions for the bending process, the rate of change of the diameter v of the ring disc is obtained. D The value range is 0.483~0.851 mm / s; select v D The values were 0.483, 0.574, 0.666, 0.758, and 0.851 mm / s, respectively. The radial translation speed v of the conical roller is obtained from formula (16) and the theoretical model of stable forming conditions in the swivel bending process. w The value range is 0.483~5.258 mm / s; Each v is plotted using formulas (15) and (16) and the theoretical model of stable forming conditions for the swivel bending process. D The axial feed speed v of the upper conical roller under the value a Core roller feed speed v f and the radial translation speed v of the cone roller w The curves showing the instantaneous height and thickness variation of the ring disk component are shown in Figures 4(a), (b), and (c). In the figures, v... D =0.483 mm / s and v D The region enclosed by the curve corresponding to 0.851 mm / s is the region corresponding to the stable forming condition of the entire spinning process of the large taper irregular ring disc determined in this embodiment.
2. The method for determining the stable forming conditions of the entire spinning process of a large-tapered irregular ring disc as described in claim 1, characterized in that, During the rotary rolling process of a large-tapered irregular-shaped ring disc, the acceleration of the diameter change at the large end of the ring disc is zero, meaning it maintains a uniform deformation rate. Furthermore, maintaining a uniform change rate in the diameter at the large end of the ring disc is the design objective for the key process parameter throughout the rotary rolling process. The outer diameter of the large end of the ring disc can be expressed as a linear function of the forming time. The uniform change rate behavior of the diameter at the large end of the ring disc during the entire rotary rolling process is described by formulas (2) and (3):
3. The method for determining the stable forming conditions of the entire spinning process of a large-tapered irregular ring disc as described in claim 1, characterized in that, In step three, the rate of change v of the ring disc diameter obtained in step two needs to be considered. D A range of values, within which five different values v are selected. D =0.483, 0.574, 0.666, 0.758, 0.851 mm / s. Based on formulas (15) and (16) and the theoretical model of stable forming conditions for the bending process, each v is plotted... D The axial feed speed v of the upper conical roller under the value a Core roller feed speed v f and the radial translation speed v of the cone roller w The curves showing the instantaneous height and thickness variation of the ring disk component are shown in Figures 4(a), (b), and (c). In the figures, v... D =0.483 mm / s and v D The region enclosed by the curve corresponding to 0.851 mm / s is the region corresponding to the stable forming condition of the entire spinning process of the large taper irregular ring disc determined in this embodiment.
4. The method for determining the stable forming conditions of the entire spinning process of a large-tapered irregular ring disc as described in claim 1, characterized in that, Based on the geometry of the ring disc and the bent blank, both can be divided into two parts: a rectangular cross-section ring and a tapered cross-section ring, where D... d D r These are the outer and inner diameters of the rectangular portion of the spun ring disc at the initial moment of irregular ring rolling; D dt D rt , respectively, represent the outer and inner diameters of the rectangular portion of the spun-rolled ring at the instant of irregular ring rolling; h0 is the initial height of the rectangular section of the spun-rolled ring; b0, b t Let Δb and ΔD represent the thicknesses of the rectangular portion of the spun-rolled ring at the initial and instantaneous moments of the shaped ring rolling process, respectively. d These represent the decrease in thickness and the increase in outer diameter of the rectangular portion of the spun ring disc during the irregular ring rolling process, respectively; D t h is the outer diameter of the large end of the conical section of the rotary rolled ring at the instantaneous moment during the irregular ring rolling stage; s b bs , respectively, represent the axial height and instantaneous average thickness of the simplified conical ring ABCD; h1 and h2 represent the large end height and small end height of the conical portion of the spun ring disc during the irregular ring rolling stage; R bs r bs Let θ represent the instantaneous outer and inner radii of the simplified conical ring ABCD at the large end during the irregular ring rolling stage, and θ be the main roll inclination angle.