A rim rolling device and a rim rolling method

Abstract

This invention relates to a wheel rim rolling device in the field of wheel rim manufacturing technology, and also to a wheel rim rolling method. The height of the main roll die reference surface (6) of the main roll (1) is 5-15 mm higher than the upper roll surface (10) of the lower conical roll. The upper end of the main roll (1) is provided with a double-sloped sidewall (11) with a depth of h. The height of the sidewall (11) h is 0.5-0.8 times the target thickness of the wheel rim. The β1 angle of the sidewall (11) is 1-4° and the β2 angle of the sidewall (11) is 15-25°. The core roll (2) is connected to a drive component I that can control the core roll (2) to move closer to or away from the main roll (1). The upper conical roll (4) is connected to a drive component II that can control the upper conical roll (4) to move closer to or away from the lower conical roll (3). The wheel rim rolling apparatus and rolling method of the present invention effectively control the wheel rim shrinkage phenomenon and roller climbing problem during the wheel rim rolling process, ensuring that the shape and size accuracy of the rolled wheel rim meets the requirements.

Description

Technical Field

[0001] This invention belongs to the field of wheel rim manufacturing technology, and more specifically, it relates to a wheel rim rolling device. This invention also relates to a wheel rim rolling method. Background Technology

[0002] Wheel rims are a crucial component of composite wheels and are widely used on locomotives. Wheel rims are relatively large, with outer diameters typically exceeding 1 meter. Traditional wheel rim rolling employs two mills: one for roughing and one for finishing. Roughing uses an open die (without passes on the main rolls or mandrel) for radial and axial rolling; finishing uses a closed die (with passes on the main rolls and mandrel forming a closed die) for radial and equal-height rolling. This two-step rolling process is inefficient and results in significant temperature drops in the rolled piece. Completing the traditional roughing and finishing processes continuously on a single ring mill significantly simplifies the process, reduces spare parts and equipment maintenance costs, and facilitates automated control. However, since the radial deformation zone reduces the wall thickness and the axial deformation zone reduces the height on the same mill, an open die is necessary, leading to new problems, such as prominent flange shrinkage issues.

[0003] Due to the asymmetry of the rim cross-section along the axial direction and the large amount of rolling deformation, the metal flow and rolling stability conditions are extremely complex when rolling in open passes on ring mills. Even if the metal in the rim pass is well filled during the middle stage of rolling, during the later stage of rolling diameter expansion, the metal at the rim is stretched circumferentially as the outer diameter of the rim increases, causing the metal at the rim to shrink, making the rim thinner and shorter, and unable to fit against the main roll—a phenomenon known as rim shrinkage. When rolling rims with an outer diameter of 1000mm or more, the rim shrinkage is significant, and in severe cases, the underfill can reach about 15mm, reducing the rolling yield. Many factors affect rim shrinkage, which is difficult to predict accurately on-line. Simply relying on pre-amplified allowances under current processes cannot accurately control the shape and size of the rolled rim. Therefore, controlling rim shrinkage in the later stage of rolling is a key issue in radially and axially rolled rims. In addition, the problem of "roll climbing" often occurs in the radial rolling of ring parts. That is, the metal tends to climb up along the main roll axis in the radial rolling deformation zone. On the one hand, it affects the stability of rolling deformation, and on the other hand, the rounded corner on the upper side of the main roll flange exacerbates the deformation of the flange throat (the transition area between the flange and the tread), which intensifies the flange shrinkage.

[0004] A novelty search revealed the following similar, publicly published professional and technical documents: 1) Manufacturing method of coarse wheel rims for railway locomotives (CN201010132498.9), Maanshan Iron & Steel Co., Ltd. This patent describes a method of immersing the wheel rim in water after rolling to accelerate cooling and ensure that the rim can undergo subsequent conventional isothermal processes within the temperature range with the highest hydrogen diffusion coefficient. This extends the effective isothermal hydrogen removal time, effectively reduces the hydrogen content in the wheel rim, and inhibits the formation of hydrogen-induced cracks. This patent does not address the flange shrinkage phenomenon during the wheel rim rolling process.

[0005] 2) Method for rolling an outer stepped cross-section ring (CN200410060887.X), Wuhan University of Technology. This patent discloses the method and steps for rolling an outer stepped cross-section ring, but does not involve the method for controlling the shape and size of the outer step during the ring rolling process, and is unrelated to the problem of wheel flange tension and shrinkage during the wheel rim rolling process.

[0006] 3) A method for radial and axial rolling of large double-sided stepped rings (CN201210073832.7), Wuhan University of Technology. This patent achieves direct rolling of rectangular ring blanks into double-sided stepped rings by rationally designing the ring blank and rolling pass, and controlling the rolling process. It differs significantly from wheel hoop rolling and does not address the issue of dimensional control of the flange on the cross-section.

[0007] 4) Guan Haiyan, Chen Zhigang, Song Tao, et al. Ring Rolling Process of Radial and Axial Ring Rolling Mill, Forging Technology, 1995, No. 3. This paper introduces the basic conditions, process principles, process route, and blank optimization design of the ring rolling process, and analyzes common defects in ring production. The paper does not cover special cases such as the rolling of rings with external flanges or wheel rims.

[0008] 5) Sha Jie, Cai Yongmin, Yu Nengfa. Research on the Problem of Incomplete Filling in the Flange of D109 Motor Wheel Hoops, Anhui Metallurgy, 2011, No. 1. This paper addresses the problem of incomplete filling in the flange of D109 wheel hoops (outer diameter less than 800mm) during rolling. It analyzes the possible causes of incomplete filling in each process and proposes solutions from the aspects of ensuring billet dimensions, rolling heating process, ring mill adjustment, and roll speed control. The paper does not cover the design of the main roll pass shape or the feed speed control of the core roll.

[0009] 6) Qian Dongsheng, Hua Lin. Blank design optimization for stepped-section profile ring rolling, SCIENCE CHINA, June 2010. This paper proposes a design principle for stepped-section profile ring blanks: the volume ratio of the "small ring" to the "large ring" on the blank should be equal to the volume ratio of the "small ring" to the "large ring" on the final ring. This design concept introduces difficulties to the blanking process and is not applicable to wheel rim rolling.

[0010] In summary, existing literature does not address the analysis and solutions related to the flange shrinkage problem that occurs during the wheel rim rolling process. Summary of the Invention

[0011] The technical problem to be solved by this invention is to provide a wheel rim rolling device that effectively controls rim shrinkage and roll climbing during the wheel rim rolling process, ensuring that the shape and dimensional accuracy of the rolled rim meets the requirements and improving product quality, thus addressing the shortcomings of existing technologies. To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention relates to a wheel rim rolling device, comprising a main roll, a core roll, an upper conical roll, and a lower conical roll. The core roll axis is parallel to the main roll axis of the main roll. The lower roll surface of the upper conical roll is parallel to the upper roll surface of the lower conical roll. The upper roll surface of the lower conical roll is parallel to the main roll axis. The height of the main roll die reference surface of the main roll is 5-15mm higher than the upper roll surface of the lower conical roll. The upper end of the main roll is provided with a double-sloped sidewall of depth h. The sidewall is divided into two sections according to the slope. The height h is 0.5-0.8 times the target thickness of the wheel rim. The β1 angle of the sidewall is 1-4°, and the β2 angle of the sidewall is 15-25°. The core roll is connected to a drive component I that can control the core roll to move closer to or away from the main roll. The upper conical roll is connected to a drive component II that can control the upper conical roll to move closer to or away from the lower conical roll.

[0012] The blank of the wheel rim ring to be processed is mounted on the mandrel, and the rolling part of the wheel rim ring blank is formed between the main roll and the mandrel.

[0013] The main roller and lower cone roller are rotary drive rollers, while the core roller and upper cone roller are passive rotary rollers.

[0014] When the wheel rim rolling device rolls the wheel rim, the rolling outer diameter corresponding to the intermediate speed control point is set to 0.92-0.96D when setting the speed of the core roller.

[0015] This invention also relates to a wheel rim rolling method that is simple in procedure, effectively controls the rim shrinkage phenomenon and roll climbing problem during the wheel rim rolling process, ensures that the shape and size accuracy of the rolled rim meets the requirements, and improves product quality.

[0016] The rolling steps of the aforementioned wheel rim rolling method are as follows: S1. A double-sloped sidewall with a depth of h is set at the upper end of the main roller. The sidewall is divided into two sections according to the slope. The height of h is 0.5-0.8 times the target thickness of the wheel rim. The β1 angle of the sidewall is 1-4° and the β2 angle of the sidewall is 15-25°. S2. When the wheel rim ring blank is rolled, the mandrel feeds towards the main roll at a set speed, and the radial deformation zone continuously presses down the thickness of the wheel rim ring blank; the upper tapered roll controls the height of the axial deformation zone according to the set pressing procedure. During the rolling process, the wheel rim is gradually formed, and the outer diameter of the wheel rim ring blank gradually increases. S3. The intermediate control point of the mandrel feed speed regime is moved back, increasing the feed amount of the mandrel in the middle and late stages of rolling, increasing the metal replenishment at the rim, and restricting the axial expansion of the radial deformation zone metal on the side wall at the upper end of the main roll pass, forcing the metal to flow towards the rim and increasing the metal replenishment at the rim.

[0017] The upper end of the main roller has a double-sloped sidewall. The sidewall inhibits the upward expansion of metal in the radial deformation zone and forces the metal to flow towards the rim, thus controlling the "roller climbing" phenomenon.

[0018] The core roll feed speed adopts a three-point speed control method. When setting the core roll 2 feed speed, the intermediate speed control point is set to 0.92-0.96D to increase the radial feed amount in the later stage of rolling.

[0019] The height of the main roll bore reference surface is 5-15mm higher than the upper roll surface of the lower cone roll, which increases the amount of metal flowing to the rim during rolling and compensates for the rim shrinkage in the later stage of rolling.

[0020] During the wheel rim forming stage, the amount of metal filled into the rim die increases, which enhances the tensile strength of the rim in the later stages of rolling.

[0021] During the rolling of wheel rims, the wall thickness of the radial deformation zone ring is reduced, the height is increased, and the circumferential extension occurs. In the initial stage of rolling, during the rim forming stage, the rim metal flows to the rim area under the action of the feed amount of the core roller, making the rim die full. In the middle and later stages of rolling, the circumferential extension of the cross section mainly depends on the radial reduction of the rim pass. Under the same outer diameter increment, the rim and rim are supplemented by the radial reduction and axial widening of the rim area.

[0022] The working principle and beneficial effects of the technical solution adopted in this invention are as follows: The wheel rim rolling apparatus and method described in this invention shifts the intermediate control point of the mandrel feed speed regime backward, which is equivalent to increasing the mandrel feed per pass in the later stages of rolling, thus increasing metal replenishment at the rim. Furthermore, the unique die shape used in the main roll restricts the upward axial expansion of metal in the radial deformation zone, forcing more metal to flow towards the rim and increasing the amount of metal replenished at the rim. The process of this invention significantly increases the amount of metal replenished at the rim in the later stages of rolling, mitigating rim shrinkage. Simultaneously, the new process employs a rolling method that raises the main roll reference plane, increasing the amount of metal filled in the rim die during the rim forming stage, enhancing the tensile strength of the rim in the later stages of rolling, and further improving the rim shrinkage phenomenon. The main improvements of this invention are: 1) The upper end of the main roll pass is designed with a double-sloped sidewall to suppress the upward widening flow of metal in the radial deformation zone, force the metal to flow towards the rim, and effectively control the "roll climbing" phenomenon; 2) During rolling, the reference surface of the main roll pass is raised by 5-15 mm compared with the surface of the lower tapered roll, which effectively increases the amount of metal flowing towards the rim during rolling and compensates for the rim shrinkage in the later stage of rolling; 3) The three-point speed control method adopted for the core roll feed speed delays the intermediate control point from the traditional 0.8D to 0.92-0.96D (D is the target outer diameter of the wheel rim), increases the radial feed amount in the later stage of rolling, which can further reduce the rim shrinkage and improve the quality of the product. Attached Figure Description

[0023] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein: Figure 1 This is a schematic diagram of the main roll structure of the wheel rim rolling device described in this invention; Figure 2 This is a schematic diagram of the wheel rim rolling device described in this invention; Figure 3 This is a schematic diagram of the three-point speed control method described in this invention; The labels in the attached diagram are as follows: 1. Main roller; 2. Core roller; 3. Lower conical roller; 4. Upper conical roller; 5. Wheel rim blank; 6. Main roller die reference surface; 7. Core roller axis; 8. Main roller axis; 9. Lower roller surface of the upper conical roller; 10. Upper roller surface of the lower conical roller; 11. Side wall. Detailed Implementation

[0024] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part: As attached Figure 1As shown, this invention is a wheel rim rolling device, including a main roll 1, a core roll 2, an upper conical roll 4, and a lower conical roll 3. The core roll axis 7 of the core roll 2 is parallel to the main roll axis 8 of the main roll 1. The lower roll surface 9 of the upper conical roll 4 is parallel to the upper roll surface 10 of the lower conical roll 3. The upper roll surface 10 of the lower conical roll is parallel to the main roll axis 8. The height of the main roll pass reference surface 6 of the main roll 1 is 5-15mm higher than the upper roll surface 10 of the lower conical roll. A double-sloped sidewall 11 with a depth of h is provided at the end. The sidewall 11 is divided into two sections according to the slope, and the height h is 0.5-0.8 times the target thickness of the wheel rim. The β1 angle of the sidewall 11 is 1-4°, and the β2 angle of the sidewall 11 is 15-25°. The core roller 2 is connected to a drive component I that can control the movement of the core roller 2 towards or away from the main roller 1. The upper conical roller 4 is connected to a drive component II that can control the movement of the upper conical roller 4 towards or away from the lower conical roller 3. The above structure addresses the shortcomings of the prior art and proposes an improved technical solution. To solve the above technical problems, this application improves the structure of the rolling device and forms a unique and ingenious rolling method. During the rolling of the wheel rim ring blank, the wall thickness of the ring in the radial deformation zone decreases, the height increases, and the circumferential extension occurs. In the initial stage of rolling (rim forming stage), the rim metal flows to the rim area under the action of a large core roller pass feed, making the rim pass full. In the later stages of rolling, the circumferential extension of the cross-section mainly depends on the radial reduction of the rim pass. With the same outer diameter increment, the rim requires more metal replenishment. Metal replenishment at the rim comes from radial reduction and axial widening. Insufficient metal replenishment at the rim during rolling results in an outer diameter increment of the rim that is smaller than that of the rim, while the rim thickness decreases, manifesting as rim shrinkage. In the newly invented process, the intermediate control point of the mandrel feed speed regime is moved backward, effectively increasing the mandrel pass feed in the later stages of rolling, thus increasing metal replenishment at the rim. Furthermore, the unique die shape of the main roll restricts the upward axial widening of the metal in the radial deformation zone, forcing more metal to flow towards the rim, increasing the amount of metal replenishment at the rim. The process of this invention significantly increases the amount of metal replenishment at the rim in the later stages of rolling and mitigates rim shrinkage. Meanwhile, the new invention process adopts a rolling method that raises the reference surface of the main roll. During the rim forming stage, the amount of metal filled in the rim die increases, which increases the tensile strength of the rim in the later stage of rolling and further improves the rim shrinkage phenomenon.The main improvements of this invention are: 1) The upper end of the main roll pass is designed with a double-sloped sidewall to suppress the upward widening flow of metal in the radial deformation zone, force the metal to flow towards the rim, and effectively control the "roll climbing" phenomenon; 2) During rolling, the reference surface of the main roll pass is raised by 5-15 mm compared to the surface of the lower conical roll, effectively increasing the amount of metal flowing towards the rim during rolling and compensating for rim shrinkage in the later stages of rolling; 3) The three-point speed control method is adopted for the core roll feed speed, delaying the intermediate control point from the traditional 0.8D to 0.92-0.96D (D is the target outer diameter of the rim), increasing the radial feed amount in the later stages of rolling, which can further reduce rim shrinkage. The rim rolling device and rolling method described in this invention have a simple structure, effectively control the rim shrinkage phenomenon and roll climbing problem during the rim rolling process, ensure that the shape and size accuracy of the rolled rim meets the requirements, and improve product quality.

[0025] The specific content of the three-point speed control method described in this invention is to control the feed speed of the rolling mandrel by setting three control points according to the outer diameter value. (Reference) Figure 3 .

[0026] The wheel rim blank 5 to be processed is mounted on the mandrel 2, and the rolling section of the wheel rim blank 5 is formed between the main roll 1 and the mandrel 2. The main roll 1 and the lower conical roll 3 are rotary drive rolls, while the mandrel 2 and the upper conical roll 4 are passive rotary rolls. This structure, through the cooperation of the main roll, mandrel, upper conical roll, and lower conical roll, completes the rolling of the wheel rim blank 5. During the rolling process, the main roll 1 and the lower conical roll 3 rotate actively, while the mandrel 2 and the upper conical roll 4 rotate passively. Under the control of the drive component I, the mandrel 2 continuously moves towards the main roll 1, thereby acting on the wheel rim blank 5 in the radial direction. Furthermore, by cooperating with the die of the main roll, it reliably achieves the processing of the wheel rim blank 5, forming a flat wheel rim. Meanwhile, under the control of the drive component II, the upper conical roll 4 continuously moves towards the lower conical roll 3, thereby acting on the wheel rim blank 5 in the axial direction, completing the rolling process.

[0027] When the aforementioned wheel rim rolling device rolls the wheel rim, the rolling outer diameter corresponding to the intermediate speed control point is set to 0.92-0.96D when setting the mandrel speed. In this structure, the three-point speed control method used for the mandrel feed speed delays the intermediate control point from the traditional 0.8D to 0.92-0.96D (D is the target outer diameter of the wheel rim), increasing the radial feed in the later stages of rolling and further reducing rim shrinkage. This effectively controls the feed amount and improves machining accuracy.

[0028] In the structure of this invention, both drive component I and drive component II are existing technologies, primarily controlling the position changes of the core roller and the upper conical roller. For example, each end of the core roller can be connected to a cylinder, which is mounted on a corresponding bracket. Controlling the extension and retraction of the cylinders allows for the adjustment and change of the core roller's position. Similarly, each end of the upper conical roller can be connected to a cylinder, which is mounted on a corresponding bracket. Controlling the extension and retraction of the cylinders allows for the adjustment and change of the upper conical roller's position.

[0029] This invention also relates to a wheel rim rolling method that is simple in procedure, effectively controls the rim shrinkage phenomenon and roll climbing problem during the wheel rim rolling process, ensures that the shape and size accuracy of the rolled rim meets the requirements, and improves product quality.

[0030] The rolling steps of the aforementioned wheel rim rolling method are as follows: S1. A double-sloped sidewall 11 with a depth of h is provided at the upper end of the main roll 1. The sidewall 11 is divided into two sections according to the slope, the height of h is 0.5-0.8 times the target thickness of the wheel rim, the β1 angle of the sidewall 11 is 1-4°, and the β2 angle of the sidewall 11 is 15-25°; S2. When the wheel rim ring blank 5 is rolled, the core roll 2 feeds towards the main roll 1 at a set speed, and the radial deformation zone continuously presses down the thickness of the wheel rim ring blank 5; the upper conical roll 4 presses down according to the slope of the main roll 1. The height of the axial deformation zone is controlled according to the set rolling schedule. During the rolling process, the wheel rim gradually takes shape, and the outer diameter of the wheel rim ring blank 5 gradually increases. S3. The intermediate control point of the mandrel 2 feed speed regime is moved backward, increasing the feed amount of the mandrel 2 in the later stages of rolling, increasing metal replenishment at the rim. The sidewall 11 at the upper end of the main roll 1's pass restricts the upward axial expansion of the radial deformation zone metal, forcing metal to flow towards the rim and increasing the amount of metal replenishment at the rim. These steps, combined with a specially designed rolling method, improve the rim shrinkage phenomenon during wheel rim rolling, ensuring rim dimensional accuracy and solving the roll climbing problem that occurs during wheel rim rolling.

[0031] The upper end of the main roller 1 has a double-sloped sidewall 11. The sidewall 11 inhibits the upward expansion of metal in the radial deformation zone and forces the metal to flow towards the rim, thus controlling the "roller climbing" phenomenon.

[0032] The feed speed of the core roll 2 adopts a three-point speed control method. When setting the feed speed of the core roll 2, the middle speed control point is set to 0.92-0.96D to increase the radial feed amount in the later stage of rolling. The height of the main roll pass reference surface 6 of the main roll 1 is 5-15mm higher than the upper roll surface 10 of the lower cone roll, which increases the amount of metal flowing to the rim during rolling and compensates for the rim shrinkage in the later stage of rolling. In the rim forming stage of the wheel rim, the amount of metal filling the rim pass increases, which increases the tensile strength of the rim in the later stage of rolling. During the rolling of the wheel rim, the wall thickness of the radial deformation zone ring is reduced, the height is increased, and the circumferential extension occurs. In the initial stage of rim forming, the rim metal flows to the rim part under the action of the core roll pass feed amount, making the rim pass full. In the middle and later stages of rolling, the circumferential extension of the cross section mainly depends on the radial reduction of the rim pass. Under the same outer diameter increment, the metal supplementation of the rim part comes from the radial reduction and axial widening.

[0033] In summary, the innovative points of this invention can be summarized as follows: 1) An open pass is used on a wheel rim ring blank rolling mill for radial and axial rolling of the wheel rim, simplifying the production process and reducing the temperature drop of the rolled piece during rolling. 2) The upper end of the main roll pass is designed with double-sloping sidewalls. In the early and middle stages of rolling, this restricts the upward expansion of the radial deformation zone, forcing the metal to flow downwards to the rim area, which improves rim forming efficiency and provides sufficient metal replenishment for later rim shrinkage. 3) When setting the mandrel feed speed, the intermediate speed control point is delayed from 0.8D (D being the target rolling outer diameter) to the range of 0.92-0.96D. This ensures that when the wheel rim outer diameter expands to 0.95D, the mandrel still has a large feed amount, reducing rim shrinkage in the later stages of rolling and improving rolling quality.

[0034] To further illustrate the improvements of this application, specific embodiments are listed below: The following example illustrates the implementation process of this invention using the rolling of a wheel rim with an outer diameter of 1080mm and a height of 155mm. After billet preparation, the outer diameter of the billet is 700mm, the billet height is 180mm, and the initial rolling temperature is 1150℃. During rolling, the upper sidewall of the main roll pass has a diameter h=68mm, the slope β1 near the bottom of the groove is 2°, and the upper slope β2 near the groove opening is 20°. The reference surface of the main roll pass is 10mm higher than the surface of the lower cone roll. The main roll rotational linear speed is 1200 mm / s. The three control points and speed values ​​for the core roll feed speed are (775mm, 6.0mm / s), (1040mm, 1.8mm / s), and (1071mm, 0.1mm / s), respectively. After approximately 30 seconds of rolling, the wheel rim dimensions meet the target requirements, the rim shape is full, and the dimensions are good, meeting the requirements for subsequent processing.

[0035] The wheel rim rolling apparatus and method described in this invention shifts the intermediate control point of the mandrel feed speed regime backward, which is equivalent to increasing the mandrel feed per pass in the later stages of rolling, thus increasing metal replenishment at the rim. Furthermore, the unique die shape used in the main roll restricts the upward axial expansion of metal in the radial deformation zone, forcing more metal to flow towards the rim and increasing the amount of metal replenished at the rim. The process of this invention significantly increases the amount of metal replenished at the rim in the later stages of rolling, mitigating rim shrinkage. Simultaneously, the new process employs a rolling method that raises the main roll reference plane, increasing the amount of metal filled in the rim die during the rim forming stage, enhancing the tensile strength of the rim in the later stages of rolling, and further improving the rim shrinkage phenomenon. The main improvements of this invention are: 1) The upper end of the main roll pass is designed with a double-sloped sidewall to suppress the upward widening flow of metal in the radial deformation zone, force the metal to flow towards the rim, and effectively control the "roll climbing" phenomenon; 2) During rolling, the reference surface of the main roll pass is raised by 5-15 mm compared with the surface of the lower tapered roll, which effectively increases the amount of metal flowing towards the rim during rolling and compensates for the rim shrinkage in the later stage of rolling; 3) The three-point speed control method adopted for the core roll feed speed delays the intermediate control point from the traditional 0.8D to 0.92-0.96D (D is the target outer diameter of the wheel rim), increases the radial feed amount in the later stage of rolling, which can further reduce the rim shrinkage and improve the quality of the product.

[0036] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A wheel rim rolling device, characterized in that: It comprises a main roller (1), a core roller (2), an upper taper roller (4) and a lower taper roller (3), the core roller axis (7) of the core roller (2) is parallel to the main roller axis (8) of the main roller (1), the lower orientation roller surface (9) of the upper taper roller (4) is parallel to the upper orientation roller surface (10) of the lower taper roller (3), the upper orientation roller surface (10) is parallel to the main roller axis (8), the height of the main roller hole type reference surface (6) of the main roller (1) is 5-15mm higher than that of the upper orientation roller surface (10) of the lower taper roller, the upper end of the main roller (1) is provided with a double-inclination sidewall (11) with a depth of h, the sidewall (11) is divided into two sections according to the inclination, the h height is 0.5-0.8 times the target thickness of the rim, the inclination of the sidewall near the groove bottom is 1-4°, and the inclination of the sidewall near the notch upper end is 15-25°; the core roller (2) is connected with a driving part I capable of controlling the core roller (2) to move towards or away from the main roller (1), and the upper taper roller (4) is connected with a driving part II capable of controlling the upper taper roller (4) to move towards or away from the lower taper roller (3). ​​ 2. The wheel rim rolling device according to claim 1, characterized in that: The wheel rim blank (5) to be processed is mounted on the core roller (2), and the rolling part of the wheel rim blank (5) is formed between the main roller (1) and the core roller (2).

3. The wheel rim rolling apparatus according to claim 1 or 2, characterized in that: The main roller (1) and the lower cone roller (3) are rotary drive rollers, while the core roller (2) and the upper cone roller (4) are passive rotary rollers.

4. The wheel rim rolling device according to claim 3, characterized in that: When the wheel rim rolling device rolls the wheel rim, the feed speed of the core roller (2) adopts the three-point speed control method. The three-point speed control method is to control the feed speed of the rolling core roller according to the outer diameter value as three control points. When setting the core roller speed, the rolling outer diameter corresponding to the middle speed control point is set to 0.92-0.96D, where D is the target outer diameter of the wheel rim.

5. A wheel rim rolling method using the wheel rim rolling apparatus according to any one of claims 1 to 4, characterized in that: The rolling steps of the aforementioned wheel rim rolling method are as follows: S1. The upper end of the main roller (1) is provided with a double-sloped sidewall (11) with a depth of h. The sidewall (11) is divided into two sections according to the slope. The height of h is 0.5-0.8 times the target thickness of the wheel rim. The slope of the sidewall near the bottom of the groove is... The angle is 1-4°, and the upper end of the slope of the sidewall near the groove opening. The angle is 15-25°; S2. When the wheel rim ring blank (5) is rolled, the core roll (2) feeds towards the main roll (1) at a set speed, and the radial deformation zone continuously presses down the thickness of the wheel rim ring blank (5); the upper cone roll (4) controls the height of the axial deformation zone according to the set pressing procedure. During the rolling process, the wheel rim is gradually formed, and the outer diameter of the wheel rim ring blank (5) gradually increases. S3. The middle control point of the feed speed system of the core roll (2) is moved back, increasing the feed amount of the core roll (2) in the middle and late stages of rolling, increasing the metal replenishment at the rim, and the side wall (11) at the upper end of the main roll (1) restricts the axial expansion of the metal in the radial deformation zone, forcing the metal to flow towards the rim, and increasing the metal replenishment at the rim.

6. The wheel rim rolling method according to claim 5, characterized in that: The upper end of the main roller (1) has a double-sloped sidewall (11). The sidewall (11) inhibits the upward expansion of metal in the radial deformation zone and forces the metal to flow towards the wheel flange, thus controlling the "roller climbing" phenomenon.

7. The wheel rim rolling method according to claim 5 or 6, characterized in that: The feed speed of the core roll (2) adopts the three-point speed control method. The three-point speed control method is to control the feed speed of the rolling core roll according to the outer diameter value by setting three control points. When setting the feed speed of the core roll (2), the intermediate speed control point is set to 0.92-0.96D, where D is the target outer diameter of the wheel rim, which increases the radial feed amount in the later stage of rolling.

8. The wheel rim rolling method according to claim 5 or 6, characterized in that: The height of the main roll bore reference surface (6) of the main roll (1) is 5-15mm higher than the upper roll surface (10) of the lower cone roll, which increases the amount of metal flowing to the rim during rolling and compensates for the rim shrinkage in the later stage of rolling.

9. The wheel rim rolling method according to claim 5 or 6, characterized in that: During the wheel rim forming stage, the amount of metal filled into the rim die increases, which enhances the tensile strength of the rim in the later stages of rolling.

10. The wheel rim rolling method according to claim 8, characterized in that: During the rolling of wheel rims, the wall thickness of the ring in the radial deformation zone decreases, the height increases, and the circumferential extension occurs. In the early stage of rolling, i.e. the rim forming stage, the wheel rim metal flows to the rim area under the action of the feed amount of the core roller, making the rim die full. In the middle and late stages of rolling, the circumferential extension of the cross section mainly depends on the radial reduction of the wheel rim. With the same outer diameter increase, the metal replenishment of the rim area comes from the radial reduction and axial widening.

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