Method and device for determining the size of an initial blank for end rolling of a large bearing ring

Abstract

The application discloses a method and device for determining the size of an initial blank of a large bearing ring, and the method comprises the following steps: calculating the longitudinal section area and volume of a target bearing ring; determining the design parameters of the size of the initial blank; determining the calculation formula of the size of the initial blank; determining the value range of the design parameters; and determining the size of the initial blank by substituting the values of the shaft radial feed ratio and the rolling ratio into the calculation formula. According to the application, by selecting different values of the rolling ratio and the shaft radial feed ratio, a series of initial blanks with different sizes can be quickly designed to meet the precision forming of the rolling of the large bearing ring, the design efficiency of the initial blank of the large bearing ring is improved, the production cycle is shortened, and the application provides an effective and scientific method for designing the size of the initial blank of the large bearing ring.

Description

Technical Field

[0001] This invention belongs to the field of ring forming and processing technology, and particularly relates to a method and apparatus for determining the initial blank size of the end-rolled large bearing ring. Background Technology

[0002] The method of continuous forming of large bearing rings by conical roll end-rolling is an advanced manufacturing technology for high performance, high efficiency, and low cost. The invention application No. 202310657649X proposed a "green forming manufacturing method for large bearing rings based on conical roll end-rolling." In the design of this process, the initial billet size determines the amount of deformation during forming. Different billet sizes lead to different deformation behaviors in the metal, thus affecting the stability of the forming process and ultimately directly impacting the geometric accuracy and mechanical properties of the large bearing ring forgings. Therefore, proposing a scientific method for determining the initial billet size for end-rolling of large bearing rings is a key problem that urgently needs to be solved in the design of this process.

[0003] Currently, the design of initial blanks for end-rolling large bearing rings still relies on experience and trial and error, resulting in a large difference between the dimensions of the formed large bearing ring forgings and the target dimensions. Often, the raceways of the ring grooves are not fully filled, so a large machining allowance needs to be designed, resulting in a large amount of subsequent machining, which leads to problems such as low material utilization, high cost, and unreasonable streamline distribution.

[0004] Patent application CN101829686A discloses a method for determining the blank size based on the rolling ratio and the radial-axial deformation distribution ratio for radial-axial rolling of rectangular cross-section rings, providing a scientific basis for the design of radial-axial rolling blanks for rectangular cross-section rings. However, this method only applies to rectangular cross-section ring blanks, and therefore is not applicable to determining the initial blank size for end-rolling of large bearing rings. Patent application CN113032857B discloses a method for determining the structural dimensions of the rolled blank for large-tapered complex irregular-shaped ring discs, providing guidance for blank design in the new rotary rolling composite forming process. However, it is also not applicable to determining the initial blank size for end-rolling of large bearing rings. Therefore, there is an urgent need to propose a method for determining the initial blank size applicable to the precision rolling forming manufacturing method of large bearing rings. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method and apparatus for determining the initial blank size for end-rolling of bearing ring components. Its advantages include the ability to design a series of initial blanks with different sizes to meet the end-rolling requirements of large bearing ring components, improving the design efficiency and product quality of initial blanks for end-rolling of large bearing ring components, shortening the production cycle, and meeting the production needs of high-quality, efficient, green, and low-cost large bearing ring forgings.

[0006] The technical solution provided by this invention is as follows:

[0007] A method for determining the initial dimensions of the end-rolled blank for large bearing ring components includes the following steps:

[0008] S1. Calculate the longitudinal cross-sectional area and volume of the target bearing ring according to its dimensions;

[0009] S2. Based on the manufacturing principle of ring rolling, determine the design parameters of the initial billet size;

[0010] S3. Based on the design parameters of the initial billet size, determine the calculation formula for the initial billet size;

[0011] S4. Based on the principle of constant volume in plastic forming, determine the range of values ​​for the design parameters;

[0012] S5. Within the range of values ​​for the axial and radial feed ratio and the rolling ratio, select a suitable initial position of the ring billet relative to the roll and substitute it into the calculation formula to determine the initial billet size.

[0013] Further, in step S1, the target bearing ring is divided into a rectangular cross-section ring and an arc-shaped cross-section ring using the segmentation compensation method. Then, the longitudinal cross-sectional area S of the target bearing ring is... f Equal to the difference in longitudinal cross-sectional area between the rectangular cross-section ring and the arc-shaped cross-section ring:

[0014]

[0015] Among them, D f Let d be the outer diameter of the target bearing ring. f H is the minimum inner diameter of the target bearing ring. f Let r be the height of the target bearing ring, r be the radius of the raceway of the target bearing ring, and θ be the central angle of the raceway of the target bearing ring.

[0016] Furthermore, in step S1, the volume V of the target bearing ring is... f Equal to the volume difference between the rectangular cross-section ring and the arc-shaped cross-section ring:

[0017]

[0018] Further, in step S2, the design parameters for the initial billet size include the rolling ratio K and the axial-radial feed ratio λ. The rolling ratio K is defined as the ratio of the longitudinal cross-sectional area of ​​the initial billet to the longitudinal cross-sectional area of ​​the target bearing ring. The axial-radial feed ratio λ is defined as the total axial feed S of the upper conical roll during the rolling process at the conical roll end. a The total radial feed S of the mandrel during radial profile ring rolling m The ratios, rolling ratio K, and radial-axial deformation distribution ratio tanα are expressed as follows:

[0019]

[0020] Where S0 is the longitudinal cross-sectional area of ​​the initial billet, S f Let b0 be the longitudinal cross-sectional area of ​​the target bearing ring, and H0 be the wall thickness and height of the initial blank. f b is the height of the target bearing ring. f l0 represents the maximum wall thickness of the target bearing ring, and l0 represents the shortest distance from the outer surface of the main roller to the outer surface of the core roller at the initial moment.

[0021] Furthermore, in step S3, the calculation formulas for the initial billet's wall thickness b0, outer diameter D0, inner diameter d0, and height H0 are as follows:

[0022]

[0023]

[0024] Among them, K lb =l0 / b0, V f The volume of the target bearing ring.

[0025] Furthermore, in step S3, the ranges of the rolling ratio K and the axial radial feed ratio λ are as follows:

[0026]

[0027] Among them, S f H represents the longitudinal cross-sectional area of ​​the target bearing ring. f b is the height of the target bearing ring. f V represents the maximum wall thickness of the target bearing ring. f Let d be the volume of the target bearing ring. m K is the maximum diameter of the longitudinal section of the core roller. lb = l0 / b0, where l0 is the shortest distance from the outer surface of the main roller to the outer surface of the core roller at the initial moment, and b0 is the initial wall thickness of the billet.

[0028] A device for determining the initial dimensions of the end-rolled blank for large bearing ring components, comprising:

[0029] The area and volume calculation module is used to calculate the longitudinal cross-sectional area and volume of the target bearing ring based on the input target bearing ring size.

[0030] The calculation formula setting module is used to set the calculation formula for the initial billet size, including the calculation formula for the initial billet wall thickness, outer diameter, inner diameter and height;

[0031] The feed ratio and rolling ratio range setting module is used to set the range of values ​​for the axial radial feed ratio and rolling ratio;

[0032] The billet size determination module is used to calculate and display the initial billet wall thickness, outer diameter, inner diameter, and height values ​​based on the selected axial and radial feed ratio and rolling ratio, using the formulas in the billet size calculation formula setting module.

[0033] In summary, based on the rolling forming process principle of large bearing ring components using a conical roll end-rolled blank (202310657649X), this invention proposes a method and apparatus for determining the initial blank size of a large bearing ring component. First, based on the dimensions of the target large bearing ring component, the longitudinal cross-sectional area and volume of the target large bearing ring component are calculated using a segmentation compensation method. Second, based on the process principle and characteristics of the new rolling forming manufacturing method for large bearing ring components, the design parameters for the initial blank size of the large bearing ring component are determined. Third, based on the principle of constant volume during plastic forming, combined with the initial position K of the ring blank relative to the rolls... lb The initial billet size is calculated using the rolling ratio K and the axial-radial feed ratio λ. Next, based on roll constraints and rolling deformation conditions, the ranges for the values ​​of the rolling ratio K and the axial-radial feed ratio λ are given. Finally, within the determined ranges for the rolling ratio K and the axial-radial feed ratio λ, a reasonable initial position K of the ring billet relative to the rolls is determined. lb This allows for the rapid determination of the initial billet's wall thickness b0, outer diameter D0, inner diameter d0, and height H0 based on the initial billet size calculation formula.

[0034] The present invention has the following beneficial effects:

[0035] For a given large bearing ring, this invention selects different rolling ratios K, axial-radial feed ratios λ, and initial positions K of the ring blank relative to the rolls. lbThe optimal value can be determined to quickly design a series of initial blanks of different sizes to meet the precision rolling requirements of large bearing ring components. This improves the design efficiency of initial blanks for end rolling of large bearing ring components, shortens the production cycle, and provides an effective scientific means for designing the dimensions of initial blanks for end rolling of large bearing ring components. It also lays an important foundation for research on the optimization design of the forming and manufacturing process of large bearing ring components, including blank design methods. By combining the finite element simulation method, the optimal initial blank for end rolling of large bearing ring components can be determined, effectively solving the defect of incomplete filling of grooves in the forming and manufacturing technology of large bearing rings. This avoids the damage to the internal flow lines of large bearing ring components caused by machining, and meets the production requirements of high quality, high efficiency, green, and low cost for large bearing ring components. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0037] Figure 1 This is a flowchart of a method for determining the initial blank size according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the shape and dimensions of a large bearing ring forging provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram illustrating the principle of the segmentation compensation method provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the initial blank shape and dimensions provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the geometric relationship between the initial billet and the target ring forging provided in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram showing the relative positions of the initial billet and each roll at the starting moment in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the forming process of a large bearing ring forging in an embodiment of the present invention;

[0044] Figure 8 This is a schematic diagram of the shape and dimensions of the core roller in an embodiment of the present invention;

[0045] Figure 9 A schematic diagram of the deformation process of the cross section of a large bearing ring forging obtained by finite element simulation verification;

[0046] Figure 10A schematic diagram of the module composition of the initial billet size determination device provided in an embodiment of the present invention.

[0047] The reference numerals in the attached drawings are as follows: 1. Main roll, 2. Initial billet, 3. Core roll, 4-1. Upper conical roll, 4-2. Lower conical roll, 5-1. First clamping roll, 5-2. Second clamping roll, 6. Intermediate billet, 7. Large bearing ring forging. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of the present invention.

[0049] Example 1

[0050] This embodiment provides a method for determining the initial blank size of the end-rolled large bearing ring component, such as... Figure 1 As shown, it mainly includes the following steps:

[0051] Step 1: Calculate the longitudinal cross-sectional area and volume of the large bearing ring.

[0052] The dimensions of the large bearing ring to be formed in this embodiment are as follows: Figure 2 As shown, its outer diameter is D. f = 884.3mm, minimum inner diameter is d f = 756.2mm, maximum wall thickness is b f = 64.1mm, height is H f =287.4mm, raceway radius is r=401mm, raceway central angle is θ=35°.

[0053] When determining the longitudinal cross-sectional area and volume of large bearing ring components, to facilitate calculation, the segmentation compensation method is first used to divide the large bearing ring components into sections as follows: Figure 3 The difference between the rectangular cross-section ring I (ABEF) and the arc-shaped cross-section ring II (CD) is shown. Then, based on the longitudinal cross-sectional area and volume of the divided rectangular cross-section ring I (ABEF) and arc-shaped cross-section ring II (CD), the longitudinal cross-sectional area and volume of the large bearing ring are determined respectively.

[0054] The vertices of the longitudinal section of the rectangular cross-section ring I (ABEF) are A, B, E, and F, respectively. The vertices of the longitudinal section of the arc-shaped cross-section ring II (CD) are C and D, respectively. Side AB is the upper end face of the large bearing ring component, side EF is the lower end face of the ring component, side BF is the outer surface of the ring component, and sides AC, DE, and CD are the inner surfaces of the ring component. The upper end face, lower end face, and outer surface of the large bearing ring component are all planes, while its inner surface is a curved surface.

[0055] Longitudinal cross-sectional area S of large bearing ring components f It equals the difference between the longitudinal cross-sectional area of ​​rectangular cross-section ring I (ABEF) and the longitudinal cross-sectional area of ​​arc-shaped cross-section ring II (CD), that is, the longitudinal cross-sectional area S of the large bearing ring component. f The calculation formula is:

[0056]

[0057] Volume V of large bearing ring components f It is equal to the difference between the volume of the rectangular cross-section ring I (ABEF) and the volume of the arc-shaped cross-section ring II (CD), that is, the volume V of the large bearing ring component. f The calculation formula is:

[0058]

[0059] In the above formula, D f For the outer diameter, d of large bearing ring components f For the minimum inner diameter and H of large bearing ring components f Let r be the height of the large bearing ring, r be the radius of the raceway of the large bearing ring, and θ be the central angle of the raceway of the large bearing ring.

[0060] Substituting the dimensions of the large bearing ring component to be formed in this embodiment into equations (1) and (2), the longitudinal cross-sectional area S of the target large bearing ring component is calculated. f =1.54×10 4 mm 2 Volume V f =3.76×10 7 mm 3 .

[0061] Step 2: Determine the design parameters for the initial billet dimensions.

[0062] The initial blank shape is as follows Figure 4 As shown, the billet dimensions include wall thickness b0, outer diameter D0, inner diameter d0, and height H0. Based on the process principle and characteristics of the rolling forming manufacturing method for large bearing ring components, the initial billet size design parameters for the end rolling of large bearing ring components are determined as the rolling ratio K, the axial-radial feed ratio λ, and the initial position K of the ring billet relative to the rolls.lb .

[0063] The rolling ratio K is defined as the ratio of the longitudinal cross-sectional area of ​​the initial billet to the longitudinal cross-sectional area of ​​the target large bearing ring, and can be expressed as:

[0064]

[0065] Where S0 is the longitudinal cross-sectional area of ​​the initial billet, S f The longitudinal cross-sectional area of ​​the target large bearing ring component.

[0066] The axial-radial feed ratio λ is defined as the total axial feed S of the upper conical roll during the rolling process at the conical roll end. a The total radial feed S of the mandrel during radial profile ring rolling m The ratio can be expressed as:

[0067]

[0068] Among them, H f For the height of the target large bearing ring component, b f The target is the maximum wall thickness of the large bearing ring component, and l0 is the shortest distance from the outer surface of the main roller 1 to the outer surface of the core roller 3 at the initial moment. Figure 5 and Figure 6 As shown.

[0069] In process 202310657649X, the initial position of the ring billet relative to the rolls is one of the important process parameters. The initial position of the ring billet relative to the rolls is denoted by K. lb To represent, K lb Defined as the ratio of the minimum initial assembly distance l0 between the outer surface of the main roll and the outer surface of the core roll to the wall thickness b0 of the initial blank, it can be expressed as:

[0070]

[0071] Step 3: Determine the calculation formula for the initial billet size.

[0072] Combining equations (3), (4), and (5), we get:

[0073] K lb λb0 2 +(H f -b f λ)b0-KS f =0 (6)

[0074] For the deformation mode of rolling large bearing rings with thinning wall thickness, reduced height, and increased diameter, the axial-radial feed ratio λ > 0. Solving equation (6) yields the calculation formula for the initial billet wall thickness b0 as shown in equation (7):

[0075]

[0076] The initial billet volume V0 is determined by equation (8):

[0077]

[0078] Based on the principle of constant volume in plastic forming, the volume V0 of the initial blank and the volume V of the target large bearing ring are... f Equal, that is:

[0079] V0 = V f (9)

[0080] Combining equations (3), (4), (5), (8), and (9), the calculation formulas for the outer diameter D0, inner diameter d0, and height H0 of the initial billet are shown in equations (10), (11), and (12):

[0081]

[0082]

[0083]

[0084] Where K is the rolling ratio, S f V is the longitudinal cross-sectional area of ​​the target large bearing ring component. f Let b0 be the volume of the target large bearing ring component, and b0 be the wall thickness of the initial blank.

[0085] In this embodiment, the farthest distance between the main roll shaft and the core roll shaft in the horizontal radial-shaft bidirectional precision ring mill system is 750mm, the main roll radius is 364.7mm, and the core roll radius is 130mm, that is, the shortest distance l0 from the outer surface of the main roll to the outer surface of the core roll is ≤255.3mm.

[0086] Step 4: Determine the range of values ​​for the initial billet size design parameters.

[0087] Based on the derived formula for calculating the initial billet size, it can be seen that as long as the size of the target large bearing ring, the rolling ratio K, and the axial-radial feed ratio λ are given, the size of the initial billet can be calculated.

[0088] (1) Determine the range of values ​​for the rolling ratio K.

[0089] To ensure the smooth manufacturing and forming of large bearing rings, two conditions must be met: roll constraint conditions and rolling deformation conditions. First, the roll constraint condition requires that the inner diameter d0 of the initial billet be greater than the maximum diameter d of the mandrel cross-section. mSecond, the rolling deformation conditions, from the initial billet to the final large bearing ring forging, involve a deformation mode of wall thickness reduction, height reduction, and diameter expansion. That is, the radial and axial geometric dimensional relationship before and after deformation can be expressed as:

[0090] b0>b f (13)

[0091] H0>H f (14)

[0092] The inner diameter d0 of the initial blank is greater than the maximum diameter d of the core roll cross section. m , is represented as:

[0093] d0>d m (15)

[0094] Combining equations (5), (11), (12), (13), (14), and (15), we obtain the range of values ​​for the rolling ratio K as follows:

[0095]

[0096] Among them, V f For the volume of the target large bearing ring component, S f H represents the longitudinal cross-sectional area of ​​the target large bearing ring component. f For the height of the target large bearing ring component, b f For the maximum wall thickness of the target large bearing ring component, d m The maximum diameter of the longitudinal section of the core roller, such as Figure 8 As shown.

[0097] (2) Determine the range of values ​​for the axial radial feed ratio λ.

[0098] Combine equations (7), (11), (12), and (15), and let... get:

[0099]

[0100] After processing, the range of values ​​for the axial radial feed ratio λ is obtained as follows:

[0101]

[0102] In this embodiment, the maximum wall thickness b of the target large bearing ring is... f = 64.1mm, height is H f =287.4mm, longitudinal cross-sectional area S f =1.54×10 4 mm 2 Volume V f =3.76×107 mm 3 The maximum diameter d of the core roller cross-section m =260mm; Substituting the above parameter values ​​into equation (16), the range of the rolling ratio K is calculated to be: 1.20 < K < 2.40. After selecting a suitable K value, substituting the above parameters into equations (17) and (18) yields the range of the axial radial feed ratio λ.

[0103] Step 5: Determine the initial dimensions of the billet.

[0104] Based on the determined range of values ​​for the rolling ratio K and the axial-radial feed ratio λ, the rolling ratio K and the corresponding axial-radial feed ratio λ are selected; to ensure a suitable end-rolling material aggregation effect, a suitable initial position K of the ring billet relative to the rolls is selected. lb K lb Generally, the value is taken as 1.15 to 1.20. Substitute the selected parameter values ​​into the calculation formulas (7), (10), (11) and (12) given in step 3 to determine the initial blank size, and you can get the wall thickness b0, outer diameter D0, inner diameter d0 and height H0 of the initial blank of the large bearing ring end rolling.

[0105] Table 1 lists all required input parameter values.

[0106] Parameter name Parameter value <![CDATA[The maximum wall thickness b of the large bearing ring f (mm)]]> 64.1 <![CDATA[The maximum outer diameter D of the large bearing ring f (mm)]]> 884.3 <![CDATA[Inner diameter d of large bearing ring parts f (mm)]]> 756.2 <![CDATA[Height H of large bearing ring workpiece f (mm)]]> 287.4 Raceway radius r (mm) of large bearing ring components 401 Central angle θ (°) of the groove in a large bearing ring. 35 <![CDATA[Initial position K of the ring blank relative to the roll lb > 1.17 <![CDATA[The maximum diameter of the core roll cross-section is d m (mm)]]> 260

[0107] In this embodiment, the outer diameter of the target large bearing ring is D. f = 884.3mm, minimum inner diameter is d f =756.2mm, maximum wall thickness b f = 64.1mm, height is H f =287.4mm, raceway radius r=401mm, raceway central angle θ=35°, substituting the above parameter values ​​into equations (1) and (2), the longitudinal cross-sectional area S of the target large bearing ring is calculated. f =1.54×10 4 mm 2 Volume V f =3.76×10 7 mm 3 The maximum diameter d of the core roller cross-section m =260mm; To ensure that the end-rolling agglomerate effect meets actual production requirements, K is selected. lb =1.17, considering the shortest distance l0 from the outer surface of the main roll to the outer surface of the core roll is ≤255.3mm, that is, the wall thickness of the initial billet is ≤218.2mm. Substituting the above parameter values ​​into equation (16), the range of the rolling ratio K is calculated to be: 1.20<K<2.40. After selecting a suitable K value, substituting the above parameters into equations (17) and (18), the range of the axial radial feed ratio λ can be obtained.

[0108] Table 1 shows all the parameter values ​​that need to be input in this embodiment. Within the range of the rolling ratio K and the axial-radial feed ratio λ, six different sets of rolling ratio K and axial-radial feed ratio λ are selected respectively. Then, combined with all the parameter values ​​that need to be input obtained in Table 1, they are substituted into equations (7), (10), (11) and (12) to obtain the wall thickness b0, outer diameter D0, inner diameter d0 and height H0 of the initial billet, as shown in Table 2.

[0109] Table 2. Dimensions of initial billets under different rolling ratios K and axial / radial feed ratios λ

[0110]

[0111] This completes the determination of the initial blank size for rolling large bearing ring components. Figure 7 This is a schematic diagram of the forming process of a large bearing ring forging. Figure 7 'a' represents the initial moment of the billet rolling process at the conical roll end. Figure 7 b is the end time of the conical roll end rolling process, that is, the moment when the process transitions from the conical roll end rolling process to the radial irregular ring rolling process. Figure 7 c is the end time of the radial irregular ring rolling process.

[0112] To verify the reliability of this invention, a finite element simulation was performed to verify the design method for the initial blank of the large bearing ring end-rolling. Based on the aforementioned design method, a rolling ratio K = 1.8 and an axial-radial feed ratio λ = 1.2 were selected. The calculated initial blank wall thickness b0 = 84.3 mm, outer diameter D0 = 515.7 mm, inner diameter d0 = 347.0 mm, and height H0 = 328.9 mm were obtained. The cross-sectional changes of the formed ring obtained through finite element simulation are as follows: Figure 9 As shown, where, Figure 9 'a' represents the initial moment of the billet rolling process at the conical roll end. Figure 9 b is the intermediate moment during the rolling process of the billet at the conical roll end. Figure 9 c represents the end time of the conical roll end rolling process, i.e., the moment when the process transitions from the conical roll end rolling process to the radial irregular ring rolling process. Figure 9 d is the intermediate time during the radial irregular ring rolling process. Figure 9e represents the end time of the radial irregular ring rolling process. It can be seen that the initial billet obtained using the above method results in a well-fitting final formed ring, with the ring roundness, rolling stability, and other forming quality indicators meeting the forming requirements, thus successfully completing the rolling forming process of the large bearing ring forging. Table 3 shows a comparison between the simulated and target values ​​of the geometric dimensions of the large bearing ring forging. It can be seen that the simulated and target values ​​of the large bearing ring forging dimensions have an error within 2%, indicating that the initial billet obtained using this invention can effectively solve the problem of incomplete filling of the raceway in the ring groove, avoiding damage to the internal flow lines of the large bearing ring forging during machining, and achieving high-quality, efficient, green, and low-cost precision forming of the large bearing ring forging.

[0113] Table 3 Comparison of simulated and target values ​​of geometric dimensions of large bearing ring forgings

[0114] Parameter name <![CDATA[Maximum wall thickness b f (mm)]]> <![CDATA[Outer diameter D f (mm)]]> Inner diameter df(mm) <![CDATA[Height H f (mm)]]> Target value 64.1 884.3 756.2 287.4 Simulated values 64.9 888.3 758.3 288.3 relative error 1.25％ 0.45％ 0.28％ 0.31％

[0115] Example 2

[0116] Based on the above method, this embodiment provides a device for determining the initial blank size of the end-rolled large bearing ring, such as... Figure 10 As shown, it mainly includes:

[0117] The area and volume calculation module is used to calculate the longitudinal cross-sectional area and volume of the target bearing ring based on the input target bearing ring size.

[0118] The calculation formula setting module is used to set the calculation formula for the initial billet size, including the calculation formula for the initial billet wall thickness, outer diameter, inner diameter and height;

[0119] The feed ratio and rolling ratio range setting module is used to set the range of values ​​for the axial radial feed ratio and rolling ratio;

[0120] The billet size determination module is used to calculate and display the initial billet wall thickness, outer diameter, inner diameter, and height values ​​based on the selected axial-radial feed ratio and rolling ratio, using formulas in the billet size calculation formula setting module. Multiple sets of axial-radial feed ratio and rolling ratio values ​​can be selected simultaneously, and the corresponding calculation results can be calculated and displayed separately.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for determining the initial blank size of a large bearing ring end-rolled component, characterized in that, Including the following steps: S1. Calculate the longitudinal cross-sectional area and volume of the target bearing ring according to its dimensions; S2. Based on the manufacturing principle of ring rolling, determine the design parameters for the initial billet size: The design parameters for the initial billet size include the rolling ratio. K axial radial feed ratio λ relative initial position of the ring billet and the roll K lb The rolling ratio K The axial radial feed ratio is defined as the ratio of the longitudinal cross-sectional area of ​​the initial blank to the longitudinal cross-sectional area of ​​the target bearing ring. λ Defined as the total axial feed of the upper conical roll during the rolling process at the conical roll end. Total radial feed of the mandrel during radial profile ring rolling The ratio of the initial position of the annular billet relative to the roll. K lb Defined as the minimum initial assembly distance between the outer surface of the main roll and the outer surface of the core roll. l 0 and the wall thickness of the initial billet b The ratio of 0 to the rolling ratio K axial radial feed ratio λ relative initial position of the ring billet and the roll K lb They are represented as follows: ， ， in, S 0 represents the longitudinal cross-sectional area of ​​the initial billet. S f Let be the longitudinal cross-sectional area of ​​the target bearing ring. b 0 and H 0 represents the initial wall thickness and height of the billet. H f The height of the target bearing race ring. b f The maximum wall thickness of the target bearing ring. l 0 represents the shortest distance from the outer surface of the main roller to the outer surface of the core roller at the initial moment; S3. Based on the design parameters of the initial billet size, determine the calculation formula for the initial billet size: wall thickness of initial billet b 0.Outer diameter D 0.Inner diameter d 0 and height H The formulas for calculating 0 are as follows: ， ， ， ， in, V f The volume of the target bearing ring; Rolling ratio K and axial radial feed ratio λ The range of values ​​for are as follows: ， ， in, d m The maximum diameter of the longitudinal section of the core roller. ; S4. Based on the principle of constant volume in plastic forming, determine the range of values ​​for the design parameters; S5. Within the range of values ​​for the axial and radial feed ratio and the rolling ratio, select an appropriate initial position value of the ring billet relative to the roll and substitute it into the calculation formula to determine the initial billet size.

2. The method for determining the initial billet size as described in claim 1, characterized in that, In step S1, the target bearing ring is divided into a rectangular cross-section ring and an arc-shaped cross-section ring using the segmentation compensation method. The longitudinal cross-sectional area of ​​the target bearing ring is then determined. S f Equal to the difference in longitudinal cross-sectional area between the rectangular cross-section ring and the arc-shaped cross-section ring: ， in, D f The outer diameter of the target bearing ring. d f The minimum inner diameter of the target bearing ring is given. H f The height of the target bearing race ring. r Let the radius of the raceway of the target bearing ring be denoted as . θ The central angle of the raceway of the target bearing ring.

3. The method for determining the initial billet size as described in claim 2, characterized in that, In step S1, the volume of the target bearing ring is... V f Equal to the volume difference between the rectangular cross-section ring and the arc-shaped cross-section ring: 。 4. A device for determining the initial blank size of a large bearing ring end-rolled component based on the method described in any one of claims 1 to 3, characterized in that, include: The area and volume calculation module is used to calculate the longitudinal cross-sectional area and volume of the target bearing ring based on the input target bearing ring size. The calculation formula setting module is used to set the calculation formula for the initial billet size, including the calculation formula for the initial billet wall thickness, outer diameter, inner diameter and height; The feed ratio and rolling ratio range setting module is used to set the range of values ​​for the axial radial feed ratio and rolling ratio; The billet size determination module is used to calculate and display the initial billet wall thickness, outer diameter, inner diameter, and height values ​​based on the selected axial and radial feed ratio and rolling ratio, using the formulas in the billet size calculation formula setting module.

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