Hub spinning forming device

Abstract

The invention discloses a hub spinning forming device. The hub spinning forming device comprises a rack, a base, a working box, a hub mold closing mechanism and a spinning mechanism arranged around the hub mold closing mechanism. The spinning mechanism comprises a first spinning roller, a second spinning roller and a third spinning roller which are staggered in the axial direction and a spinning feeding assembly used for driving the first spinning roller, the second spinning roller and the third spinning roller to move, and the first spinning roller, the second spinning roller and the third spinning roller are distributed in a delta shape around the hub mold closing mechanism; the first spinning roller, the second spinning roller and the third spinning roller are different in structure; the edge fillet radiuses of the first spinning roller, the second spinning roller and the third spinning roller are gradually reduced in sequence; and the oblique transition angles of the first spinning roller and the second spinning roller are the same and are more than 1.5 times larger than the oblique transition angle of the third spinning roller. According to the multi-wheel spinning device, multi-wheel cooperative high-precision cooperative movement is achieved, spinning is conducted by configuring different spinning wheel structures, the spinning precision and the spinning efficiency are both considered, and the hub forming quality is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing, and more specifically, to a wheel hub spinning forming apparatus. Background Technology

[0002] Currently, aluminum alloy wheels for new energy vehicles are widely used in the manufacturing field due to their advantages of lightweight, high strength, and corrosion resistance. Their manufacturing processes mainly include casting, forging, and spinning. Casting (such as low-pressure casting and gravity casting) is suitable for large-scale production and can form complex spoke structures, but it suffers from internal defects such as porosity and shrinkage, affecting the mechanical properties and fatigue strength of the wheel. Forging uses high temperature and high pressure to plastically deform the billet, obtaining high-density, high-performance wheels, but it requires large equipment investment and high mold costs, and it is difficult to form large-size thin-walled structures. Spinning, as an advanced plastic processing technology, has been gradually applied in wheel manufacturing in recent years. Spinning is a rotary thinning process that only plastically extrudes the outer surface of the aluminum alloy billet. Through the relative extrusion and cutting motion between the spinning wheel and the billet, the billet undergoes localized continuous plastic deformation along a predetermined trajectory, resulting in the desired wheel shape and good mechanical properties. However, traditional spinning equipment often uses fixed trajectories or simple programs to control the movement of a single spinning wheel, making it difficult to achieve high-precision coordinated movement of multiple wheels. At the same time, it does not comprehensively consider spinning accuracy and spinning efficiency, resulting in uneven distribution of hub wall thickness and local stress concentration, which affects the geometric accuracy, structural strength and processing efficiency of the forming. Summary of the Invention

[0003] The present invention aims to overcome at least one of the defects of the prior art and provide a wheel hub spinning forming device to solve the problems of existing spinning equipment using fixed trajectory or simple program control of single spinning wheel movement, which makes it difficult to achieve high-precision coordinated movement of multiple wheels, and does not comprehensively consider spinning accuracy and spinning efficiency, resulting in uneven distribution of wheel hub wall thickness, local stress concentration, and affecting the geometric accuracy, structural strength and processing efficiency of forming.

[0004] The technical solution adopted in this invention is as follows:

[0005] A wheel hub spinning forming apparatus includes: a frame, a base disposed at the bottom of the frame, a work box disposed on the frame and spaced apart from the base, a wheel hub mold clamping mechanism connected to both the base and the work box, and a spinning mechanism disposed around the wheel hub mold clamping mechanism; the spinning mechanism includes a first spinning wheel, a second spinning wheel, and a third spinning wheel offset along the axial direction, and a spinning feed assembly for driving the first spinning wheel, the second spinning wheel, and the third spinning wheel to move; the first spinning wheel, the second spinning wheel, and the third spinning wheel are arranged in a triangular pattern around the wheel hub mold clamping mechanism; the structures of the first spinning wheel, the second spinning wheel, and the third spinning wheel are all different; and the edge fillet radii of the first spinning wheel, the second spinning wheel, and the third spinning wheel decrease sequentially; the oblique transition angles of the first spinning wheel and the second spinning wheel are the same and are more than 1.5 times greater than the oblique transition angle of the third spinning wheel.

[0006] In one embodiment, the total axial misalignment between the rotating wheels is between 3.5 mm and 5 mm.

[0007] In one embodiment, the thickness of the first rotating wheel is greater than the thickness of the second rotating wheel; the thickness of the second rotating wheel is the same as the thickness of the third rotating wheel.

[0008] In one embodiment, the oblique transition angle is provided with a rounded transition at the connection between the upper and lower planes of the wheel.

[0009] In one embodiment, the spinning feed assembly is a three-axis feed assembly.

[0010] In one embodiment, the feed rates of the first, second, and third rotary wheels range from 0.3 to 2.5 mm / r.

[0011] In one embodiment, the first, second, and third rotating wheels are made of Cr12MoV steel.

[0012] In one embodiment, the wheel hub mold closing mechanism includes a turntable mold closing assembly and a main hydraulic cylinder that provides mold closing pressure to the turntable mold closing assembly.

[0013] In one embodiment, the turntable mold assembly includes a lower turntable connected to a base and an upper turntable connected to a work box and corresponding to the lower turntable; the upper turntable is provided with an upper mold, and the lower turntable is provided with a lower mold; the upper mold is connected to a main hydraulic cylinder.

[0014] In one embodiment, the wheel hub mold closing mechanism further includes a filling tank for injecting a pressure medium into the inside of the wheel hub blank.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least the following: This technical solution utilizes multi-wheel coordinated high-precision motion and employs different rotating wheel structures for spinning, balancing spinning accuracy and efficiency to improve the quality of wheel hub forming. Specifically, the wheel hub spinning forming device in this technical solution is equipped with a first rotating wheel, a second rotating wheel, and a third rotating wheel arranged in a triangular pattern, with the three rotating wheels offset axially. The spinning feed assembly coordinates the control of the three rotating wheels to achieve high-precision offset motion under the triangular distribution of the three rotating wheels. Furthermore, this technical solution sets the first, second, and third spinning wheels to be different, thus allowing them to play different roles in the spinning process. Since the edge radius of the first, second, and third spinning wheels decreases sequentially, the movement trajectory of the first spinning wheel is set as the hub boundary in this technical solution. Its main function is to touch the hub boundary, find and determine the boundary position of the hub, and set it as the starting position for spinning pre-forming. That is, the first spinning wheel does not spin the hub and does not thin the rim wall thickness. The second spinning wheel is used to perform preliminary spinning thinning of the rim based on the starting position obtained by the first spinning wheel. After the spinning of the first and second spinning wheels, the rim has been processed to a relatively suitable size. The third spinning wheel is used to further thin the rim while processing the unprocessed parts of the first two wheels and performing surface roughness processing to ensure that the roughness requirements are met. In this technical solution, the oblique transition angles of the first and second rotating wheels are the same and are more than 1.5 times greater than the oblique transition angle of the third rotating wheel. This facilitates processing and ensures that the working angle of the third rotating wheel better fits the hub boundary, meeting the requirements of precision machining. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the wheel hub spinning forming device according to an embodiment of the present invention.

[0017] Figure 2 This is a partial structural schematic diagram of the wheel hub spinning forming device according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the spinning feed assembly according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the first rotating wheel according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the second rotating wheel according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of the third rotating wheel as described in an embodiment of the present invention.

[0022] Reference numerals: 10, frame; 20, base; 30, work box; 40, hub mold closing mechanism; 411, lower turntable; 412, upper turntable; 413, upper mold; 414, lower mold; 42, main hydraulic cylinder; 50, spinning mechanism; 51, first spinning wheel; 52, second spinning wheel; 53, third spinning wheel; 54, spinning feed assembly; 541, first slide; 5411, first slider; 5412, hydraulic cylinder; 542, second slide; 5421, second slider; 5423, first stepper motor; 5424, first ball screw; 5425, first guide rail; 543, third slide; 5432, second stepper motor; 5433, second ball screw; 5434, second guide rail; 60, filling tank. Detailed Implementation

[0023] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] like Figures 1-6 A wheel hub spinning forming apparatus is shown, comprising: a frame 10, a base 20 disposed at the bottom of the frame 10, a work box 30 disposed on the frame 10 and spaced apart from the base 20, a wheel hub mold clamping mechanism 40 connected to both the base 20 and the work box 30, and a spinning mechanism 50 disposed around the wheel hub mold clamping mechanism 40; the spinning mechanism 50 includes a first spinning wheel 51, a second spinning wheel 52, and a third spinning wheel 53 offset along the axial direction, and a mechanism for driving the first spinning wheel 51, the second spinning wheel 52, and the third spinning wheel 53. The spinning feed assembly 54 with three rotating wheels 53 has the first rotating wheel 51, the second rotating wheel 52, and the third rotating wheel 53 arranged in a triangular pattern around the hub mold closing mechanism 40. The structures of the first rotating wheel 51, the second rotating wheel 52, and the third rotating wheel 53 are all different. The radius of the rounded corners of the first rotating wheel 51, the second rotating wheel 52, and the third rotating wheel 53 decreases sequentially. The oblique transition angles of the first rotating wheel 51 and the second rotating wheel 52 are the same and are more than 1.5 times greater than the oblique transition angle of the third rotating wheel 53.

[0025] This embodiment utilizes multi-wheel coordinated high-precision motion and employs different rotating wheel structures for spinning, balancing spinning accuracy and efficiency to improve the quality of wheel hub forming. Specifically, the wheel hub spinning forming device in this embodiment is equipped with a first rotating wheel 51, a second rotating wheel 52, and a third rotating wheel 53 arranged in a triangular pattern, with the three rotating wheels offset axially. The spinning feed assembly 54 coordinates the control of the three rotating wheels to achieve high-precision offset motion under the triangular distribution of the three rotating wheels. Furthermore, in this embodiment, the first rotating wheel 51, the second rotating wheel 52, and the third rotating wheel 53 are all different, thus playing different roles in the spinning process. Since the edge radius of the first rotating wheel 51, the second rotating wheel 52, and the third rotating wheel 53 decreases sequentially, the movement trajectory of the first rotating wheel 51 is set as the hub boundary in this embodiment. Its main function is to touch the hub boundary, find and determine the boundary position of the hub, and set it as the starting position for spinning pre-forming. That is, the first rotating wheel 51 does not spin the hub and does not thin the wall thickness of the hub rim. The second rotating wheel 52 is used to perform preliminary spinning thinning of the rim based on the starting position obtained by the first rotating wheel 51. After the spinning of the first rotating wheel 51 and the second rotating wheel 52, the rim has been processed to a more suitable size. The third rotating wheel 53 is used to further thin the rim while processing the unprocessed parts of the first two wheels and performing surface roughness processing to ensure that the roughness requirements are met. In this embodiment, the oblique transition angles of the first rotating wheel 51 and the second rotating wheel 52 are the same and are more than 1.5 times greater than the oblique transition angle of the third rotating wheel 53. On the one hand, this facilitates processing, and on the other hand, this design can ensure that the working angle of the third rotating wheel 53 better fits the hub boundary and meets the requirements of precision machining.

[0026] Specifically, in this embodiment, the radius of each rotating wheel is uniformly set to 150mm, wherein the radius of the edge fillet of the first rotating wheel 51 is 20mm (i.e., R20 in the figure), and the radius of the edge fillet of the second rotating wheel 52 is 15mm (i.e., R15 in the figure).

[0027] In this embodiment, the radius of the rounded corner of the edge of the third rotating wheel 53 is r3, where r1 ≥ 3r3. Specifically, in this embodiment, the radius of the rounded corner of the edge of the third rotating wheel 53 is r3 = 6mm (i.e., R6 in the figure).

[0028] In this embodiment, the oblique transition angle of the first rotating wheel 51 and the second rotating wheel 52 is 60°, and the oblique transition angle of the third rotating wheel 53 is 30°.

[0029] When the wheel hub needs to be spun, the blank to be spun is placed in the wheel hub mold closing mechanism 40, and the movement of the three spinning wheels is controlled by the spinning feed assembly 54 to achieve high-precision staggered movement under the triangular distribution of the three spinning wheels.

[0030] In this embodiment, the total axial misalignment between the spinning wheels is between 3.5mm and 5mm. The total axial misalignment is selected according to the control variable method to determine its optimal value. In this embodiment, the total axial misalignment is 4mm.

[0031] In this embodiment, the thickness of the first rotating wheel 51 is greater than the thickness of the second rotating wheel 52; the thickness of the second rotating wheel 52 is the same as the thickness of the third rotating wheel 53. The first rotating wheel 51 is used for pre-forming, and its thickness can be appropriately increased, while the third rotating wheel 53 is used to process the parts that the second rotating wheel 52 has not processed.

[0032] In this embodiment, the connection between the oblique transition angle and the upper and lower planes of the rotating wheel is provided with a rounded transition to avoid stress concentration during the processing.

[0033] The spinning feed assembly 54 described in this embodiment is a three-axis feed assembly, which drives three spinning wheels to move on the X-axis, Y-axis and Z-axis, realizing high-precision coordinated motion of the three wheels.

[0034] The spinning feed assembly 54 described in this embodiment includes a first slide 541 that drives each corresponding spinning wheel to move along the Y-axis to the workpiece, a second slide 542 that drives the first slide 541 to move up and down along the Z-axis, and a third slide 543 that drives the second slide 542 to move along the X-axis. This enables the first spinning wheel 51, the second spinning wheel 52, and the third spinning wheel 53 to move in all directions in three-dimensional space, thereby achieving better coordinated high-precision movement of the three wheels and improving spinning accuracy and hub forming quality.

[0035] In this embodiment, the first slide table 541 includes a first bracket with a first slider 5411 and a hydraulic cylinder 5412 mounted on the first bracket; the hydraulic cylinder 5412 is connected to a first rotating wheel 51, a second rotating wheel 52, or a third rotating wheel 53. The feeding of each rotating wheel is achieved through the telescopic shaft of the hydraulic cylinder 5412.

[0036] In this embodiment, the second slide table 542 includes a second bracket with a second slider 5421, a first stepper motor 5423 mounted on the second bracket, a first ball screw 5424 connected to the first stepper motor 5423, and a first guide rail 5425 for guiding. The first slide table 541 is connected to the first ball screw 5424. Specifically, the first bracket is provided with a nut fitted onto the first ball screw 5424, and the first slider 5411 slides in cooperation with the first guide rail 5425 to achieve stable guiding and further ensure transmission accuracy.

[0037] In the design of the spinning feed assembly 54, the feed speed, stability, and precise fit between the spinning wheel and the hub blank need to be comprehensively considered. Selecting a suitable drive based on the spinning requirements of the spinning machine and the physical properties of the aluminum alloy is a crucial step in achieving high-quality spun products. The advantages of ball screws include reversible transmission and high precision, ensuring transmission stability while achieving precise motion control. The advantages of stepper motors include precise control of speed and position, eliminating the need for A / D conversion, and directly converting digital pulse signals into angular displacement. In this mechanism, this allows for better control of the ball screw's transmission.

[0038] Similarly, the third slide 543 includes a third bracket, a second stepper motor 5432 mounted on the third bracket, a second ball screw 5433 connected to the second stepper motor 5432, and a second guide rail 5434 for guiding. The second slide 542 is connected to the second ball screw. Specifically, the second bracket is provided with a nut fitted onto the second ball screw 5433, and the second slider 5421 slides in cooperation with the second guide rail 5434 to achieve stable guiding and further ensure transmission accuracy.

[0039] In this embodiment, there are at least two first guide rails 5425 and two second guide rails 5434. In this embodiment, two first guide rails 5425 are arranged in parallel and spaced apart, respectively located on two opposite sides of the corresponding ball screw.

[0040] In this embodiment, the feed rate range of the first rotary wheel 51, the second rotary wheel 52, and the third rotary wheel 53 is 0.3-2.5 mm / r. The feed rate is selected according to the control variable method to select its optimal value. In this embodiment, the feed rate is 0.9 mm / s.

[0041] In this embodiment, the first spinning wheel 51, the second spinning wheel 52, and the third spinning wheel 53 are made of Cr12MoV steel. The spinning wheel material directly affects the durability, hardness, and precision of the spinning wheel, as well as the smoothness of the surface and the dimensional accuracy requirements of the spun hub. By comparing the composition, hardness, wear resistance, tensile strength, yield strength, machinability, corrosion resistance, and price of Cr12MoV steel, high-speed steel, DC53 steel, and cemented carbide, Cr12MoV steel exhibits excellent performance in wear resistance, hardness, yield strength, and tensile strength. Its machinability is generally achieved by stretching the hub shape without damaging it. When other properties are similar, Cr12MoV steel has lower controllable costs and better economic benefits.

[0042] The wheel hub mold closing mechanism 40 described in this embodiment includes a turntable mold closing assembly and a main hydraulic cylinder 42 that provides mold closing pressure to the turntable mold closing assembly.

[0043] The turntable mold-closing assembly described in this embodiment includes a lower turntable 411 connected to the base 20 and an upper turntable 412 connected to the work box 30 and corresponding to the lower turntable 411. An upper mold 413 is provided on the upper turntable 412, and a lower mold 414 is provided on the lower turntable 411, with the lower mold 414 corresponding to the upper mold 413. The upper mold 413 is connected to the main hydraulic cylinder 42. When a wheel hub needs to be processed, the blank to be spun is placed on the lower mold 414. The upper mold 413 and lower mold 414 are used to position and accommodate the blank. During operation, the main hydraulic cylinder 42 drives the upper mold 413 downwards to close with the lower mold 414, securing the blank heated to approximately 280°C (thermoplastic state).

[0044] Specifically, during the spinning process, the aluminum alloy wheel blank is heated to 280°C to a thermoplastic state and fixed in the positioning device of the lower mold 414. The upper mold 413 is pressed down to fit the mold, and spinning is performed using a three-roller staggered spinning process. The upper mold 413, lower mold 414, and blank rotate together on a fixed axis, with no relative displacement between the blank and the upper and lower mandrels. The mandrel in the lower mold 414 drives the aluminum alloy blank to rotate at high speed, and the three rollers begin to spin the metal surface in sequence. Through the staggered downward movement of the three rollers, the blank is stretched and plastically deformed while rotating until the metal sheet is completely fitted to the mold and formed.

[0045] The wheel hub mold closing mechanism 40 described in this embodiment also includes a filling tank 60 for injecting a pressure medium into the inner side of the wheel hub blank.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A wheel hub spinning forming apparatus, characterized in that, include: The machine includes a frame, a base at the bottom of the frame, a work box on the frame and spaced apart from the base, a hub mold-closing mechanism connected to both the base and the work box, and a spinning mechanism surrounding the hub mold-closing mechanism. The spinning mechanism includes a first spinning wheel, a second spinning wheel, and a third spinning wheel offset along the axial direction, and a spinning feed assembly for driving the first spinning wheel, the second spinning wheel, and the third spinning wheel. The first spinning wheel, the second spinning wheel, and the third spinning wheel are arranged in a triangular pattern around the hub mold-closing mechanism. The structures of the first spinning wheel, the second spinning wheel, and the third spinning wheel are all different. The corner radii of the first spinning wheel, the second spinning wheel, and the third spinning wheel decrease sequentially. The oblique transition angles of the first spinning wheel and the second spinning wheel are the same and are more than 1.5 times greater than the oblique transition angle of the third spinning wheel.

2. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The total axial misalignment between the rotating wheels is between 3.5mm and 5mm.

3. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The thickness of the first rotating wheel is greater than the thickness of the second rotating wheel; the thickness of the second rotating wheel is the same as the thickness of the third rotating wheel.

4. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The oblique transition angle is provided with a rounded transition at the connection between the upper and lower planes of the wheel.

5. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The spinning feed assembly is a three-axis feed assembly.

6. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The feed rates of the first, second, and third rotary wheels range from 0.3 to 2.5 mm / r.

7. The wheel hub spinning forming apparatus according to claim 1, characterized in that, The first, second, and third rotating wheels are made of Cr12MoV steel.

8. The wheel hub spinning forming apparatus according to any one of claims 1-7, characterized in that, The wheel hub mold closing mechanism includes a turntable mold closing assembly and a main hydraulic cylinder that provides mold closing pressure to the turntable mold closing assembly.

9. The wheel hub spinning forming apparatus according to claim 8, characterized in that, The turntable mold assembly includes a lower turntable connected to the base and an upper turntable connected to the work box and corresponding to the lower turntable; the upper turntable is provided with an upper mold, and the lower turntable is provided with a lower mold; the upper mold is connected to the main hydraulic cylinder.

10. The wheel hub spinning forming apparatus according to claim 9, characterized in that, The wheel hub mold closing mechanism also includes a filling tank for injecting a pressure medium into the inner side of the wheel hub blank.

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