Internal and external bidirectional fixing device for hub machining

Abstract

The invention relates to the technical field of hub machining equipment, in particular to an internal and external bidirectional fixing device for hub machining, which comprises an external fixing disc, external clamping slide blocks, a transmission rod, a connecting column, an induction elastic block, a profiling clamping jaw, an internal fixing gear, an internal fixing mechanism, an internal fixing rod, a transmission gear, a cam clamping block, a sleeving hole, a plate-shaped bulge, a differential spring and a limiting stop block. By means of the design of the differential springs in the sleeving holes and related structures of the differential springs, the hub workpiece is positioned through the inner fixing mechanism firstly, then the hub workpiece is clamped and fixed through the outer fixing mechanism, and therefore the technical effects that it is guaranteed that the position of a hub is accurate in the machining process, and machining errors caused by inaccurate positioning are avoided are achieved; and the fixing efficiency and the machining precision of the machine tool on the hub workpiece are improved.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub processing equipment, in particular to an internal and external bidirectional fixing device for wheel hub processing. Background Art

[0002] As an important part of modern industry, the automotive industry is undergoing unprecedented changes. With the continuous advancement of technology and the increasing diversification of consumer demand, automakers are constantly optimizing various components of the car to meet market demand while pursuing higher performance, lower energy consumption, and a smarter driving experience. In this process, the wheel hub, as one of the key components of the car, its quality and design directly affect the tire's grip, the vehicle's steering response, and driving stability. In recent years, with the rapid increase in the market share of new energy vehicles, the importance of the wheel hub has been further enhanced. The motor torque and speed of new energy vehicles are large, which puts higher requirements on the strength and durability of the wheel hub.

[0003] The production process of automobile wheels involves multiple steps. First, the appropriate material, such as aluminum alloy or steel, is selected and the rough wheel blank is formed by gravity casting or low-pressure casting. After casting, rough machining is required to remove excess material, and then the wheel is placed on a milling machine, lathe or other processing machine for precision machining to meet the size and shape requirements of the wheel. After the fine machining, the wheel is sent to the heat treatment workshop for processing and strict quality inspection to ensure that each wheel meets the standards. Finally, surface treatment, such as painting or anodizing, is used to improve the corrosion resistance and appearance of the wheel.

[0004] During the production and processing of the above-mentioned wheel hub, in the precision processing stage, companies often use the external positioning method to fix the rough wheel hub on the machine tool to perform precision processing such as milling of the wheel hub spokes. However, the external positioning method usually requires the installation of multiple identical fixing mechanisms on the fixed platform of the machine tool, and then these fixing mechanisms are abutted against the outer ring of the wheel hub one by one to achieve the clamping and fixing of the wheel hub. On the one hand, this fixing method is time-consuming and adds to the workload of the staff. On the other hand, the outer surface of the wheel hub has inherent unevenness due to defects such as uneven casting, pores or rough surface, which causes the fixture to rely on the outer surface of the wheel hub for alignment. The external fixing mechanism may cause movement during the finishing process, resulting in defects in the finished product and increasing the possibility of scrapping and rework. In mass production, these problems may be exacerbated, leading to higher scrap rates and increased manufacturing costs.

[0005] In view of this, in order to overcome the above technical problems, the present invention proposes an internal and external bidirectional fixing device for wheel hub processing. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problem is: the internal and external bidirectional fixing device for wheel hub processing described in the present invention comprises a fixing platform, and the fixing platform is used to place the wheel hub workpiece to be processed; It also includes: the fixed platform is evenly provided with T-shaped slots extending from the edge to the center, an external fixing mechanism is installed under the fixed platform, and the external fixing mechanism includes: An outer fixing plate, the outer fixing plate is located directly below the fixed platform and is rotatably connected to the fixed platform; A power assembly, the power assembly is used to drive the outer fixed plate to perform periodic reciprocating rotation at a fixed angle; The outer clamping slide block is slidably connected in the T-shaped groove. The transmission rod is evenly and fixedly connected with the connecting columns which are the same as those below the outer clamping slider on the outer edge of the outer fixing plate. The transmission rod is sleeved on the connecting columns between the outer fixing plate and the outer clamping slider and is rotatably connected with the two connecting columns.

[0007] Preferably, a plurality of induction spring blocks are elastically and evenly mounted circumferentially at the placement position of the outer ring of the hub workpiece on the upper end of the fixed platform, and a driving switch of the power assembly is mounted in the mounting groove below the induction spring blocks.

[0008] Preferably, the T-shaped groove extends to the sensing spring block toward the center of the fixed platform, and penetrates the entire edge of the fixed platform toward the edge of the fixed platform.

[0009] Preferably, a contoured clamping jaw is detachably mounted above the outer clamping slider, and a side of the contoured clamping jaw close to the hub workpiece is a concave curved surface having the same shape as the outer ring of the hub workpiece.

[0010] Preferably, an inner fixed gear is installed between the outer fixed plate and the fixed platform, and the inner fixed gear is fixedly connected to the outer fixed plate. An inner fixing mechanism located inside the wheel hub workpiece placement position is evenly installed on the fixed platform, and the inner fixing mechanism fixes the wheel hub workpiece from the inside under the transmission action of the inner fixed gear.

[0011] Preferably, the internal fixation mechanism comprises: An inner fixing rod, the inner fixing rod passes through the fixed platform and is rotatably connected to the fixed platform; A transmission gear, the transmission gear is fixedly connected to the lower end of the inner fixed rod, and the transmission gear is meshed with the inner fixed gear; The cam clamp block is sleeved on the portion of the upper end of the inner fixing rod extending out of the fixing platform, and the outer edge of the cam clamp block abuts against the inner ring of the hub workpiece during the rotation of the inner fixing rod.

[0012] Preferably, the fixing position of the outer clamping slide block on the outer ring of the hub workpiece is not colinear with the fixing position of the cam clamping block on the inner ring of the hub workpiece.

[0013] Preferably, the sum of the major axis of the elliptical cam clamp and the shortest distance from its side to the center of the fixed platform is greater than the inner ring radius length of the hub workpiece.

[0014] Preferably, the cam clamp block and the inner fixing rod have a plate-like protrusion extending inward from the sleeve hole, the portion of the inner fixing rod located in the sleeve hole also has the same plate-like protrusion extending outward, and a differential spring is fixedly connected between the two plate-like protrusions of the cam clamp block and the inner fixing rod at the sleeve hole.

[0015] Preferably, the plate-shaped protrusion of the inner fixing rod in the sleeve hole is also fixedly connected to a limit stop on the side along the rotation direction of the inner fixing rod, and the differential springs installed on both sides of the limit stop are hard springs with a stiffness coefficient of more than 500N / m.

[0016] The beneficial effects of the present invention are as follows: 1. When the outer fixing plate rotates, it will drive multiple evenly distributed outer clamping sliders to move simultaneously. This evenly distributed design allows the clamping force to act evenly on the hub workpiece, effectively reducing vibration and offset during processing, thereby improving processing accuracy; the T-slot design not only provides a stable sliding path for the outer clamping slider, but also enhances the structural strength of the fixed platform, so that deformation or damage will not occur during the clamping process, ensuring the long-term stable operation of the equipment.

[0017] 2. Through the design of the differential spring in the sleeve hole and its related structure, the internal fixing mechanism first completes the positioning of the hub workpiece, and then the external fixing mechanism completes the clamping and fixing of the hub workpiece, thereby ensuring the accurate position of the hub during the processing and avoiding the processing error caused by inaccurate positioning. The technical effect improves the fixing efficiency and processing accuracy of the machine tool for the hub workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the overall structure of the present invention from a bottom viewing angle; Figure 3 is a three-dimensional structural cross-sectional view of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the outer clamping slider of the present invention; Figure 5 It is a partial top view of the internal fixation mechanism and related structures of the present invention.

[0020] In the figure: 1. fixed platform; 2. T-slot; 3. external fixing mechanism; 4. external fixing plate; 5. power assembly; 6. external clamping slider; 7. transmission rod; 8. connecting column; 9. induction spring block; 10. contoured clamping claw; 11. internal fixed gear; 12. internal fixing mechanism; 13. internal fixing rod; 14. transmission gear; 15. cam clamp block; 16. sleeve hole; 17. plate-like protrusion; 18. differential spring; 19. limit stop block. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figures 1 to 5 As shown, an embodiment of the present invention provides an internal and external bidirectional fixing device for wheel hub processing, comprising a fixing platform 1, on which a wheel hub workpiece to be processed is placed; The fixing platform 1 is evenly provided with T-shaped slots 2 extending from the edge to the center, and an external fixing mechanism 3 is installed below the fixing platform 1. The external fixing mechanism 3 includes: An outer fixing plate 4, wherein the outer fixing plate 4 is located directly below the fixing platform 1 and is rotatably connected to the fixing platform 1; A power assembly 5, the power assembly 5 is used to drive the outer fixed plate 4 to perform periodic reciprocating rotation at a fixed angle; The outer clamping slide block 6, which is in the shape of an I, is slidably connected in the T-shaped groove 2; The transmission rod 7, the outer edge of the outer fixing plate 4 is evenly fixedly connected with the connecting column 8 which is the same as the one below the outer clamping slider 6, the transmission rod 7 is sleeved on the connecting column 8 between the outer fixing plate 4 and the outer clamping slider 6, and is rotatably connected with the two connecting columns 8.

[0023] As an embodiment of the present invention, a plurality of induction spring blocks 9 are uniformly and elastically mounted on the upper end of the fixed platform 1 at the placement position of the outer ring of the hub workpiece, and a driving switch of the power assembly 5 is installed in the mounting groove below the induction spring block 9 .

[0024] As an implementation mode of the present invention, the T-slot 2 extends toward the center of the fixed platform 1 to the sensing spring block 9 , and penetrates the entire edge of the fixed platform 1 toward the edge of the fixed platform 1 .

[0025] When the hub workpiece is placed on the fixed platform 1, its weight presses the induction spring blocks 9 elastically installed on the platform to move downward. These induction spring blocks 9 are designed to be able to deform slightly, so as to accurately trigger the switch of the power component 5 below. Once the switch is triggered, the outer fixing plate 4 driven by the power component 5 begins to rotate, thereby driving the transmission rod 7 connected to it through the connecting column 8 to start moving together, and finally the outer clamping slider 6 with the connecting column 8 also installed at the bottom slides smoothly along the T-slot 2 toward the middle of the fixed platform 1, applying a uniform clamping force to the outer ring of the hub workpiece, thereby clamping and fixing it; the outer clamping slider 6 is in the shape of an "I" character, matching the T-slot 2, to ensure that it will not loosen or deviate during the sliding process; it is worth noting that when the outer fixing plate 4 rotates, it will drive multiple evenly distributed outer clamping sliders 6 to move at the same time. This uniform distribution The design enables the clamping force to act evenly on the hub workpiece, effectively reducing vibration and deviation during machining, thereby improving machining accuracy; the T-slot 2 design not only provides a stable sliding path for the outer clamping slider 6, but also enhances the structural strength of the fixing platform 1, so that deformation or damage will not occur during the clamping process, ensuring the long-term stable operation of the equipment; even if the outer clamping slider 6 needs to be replaced due to long-term clamping and fixing work, the T-slot 2 that runs through the outside makes the replacement process simpler and more convenient; the entire fixing process is highly automated, and the precise triggering mechanism of the induction spring block 9 ensures that the fixing program is started only when the workpiece is correctly placed, avoiding the risk of misoperation; the power component 5 can be precisely controlled by a servo motor, etc., to ensure the stability and repeatability of the rotation of the outer fixing plate 4, further improving the machining quality.

[0026] As an embodiment of the present invention, a contoured clamping jaw 10 is detachably mounted above the outer clamping slider 6 , and the contoured clamping jaw 10 has a concave curved surface on the side close to the hub workpiece that is the same shape as the outer ring of the hub workpiece.

[0027] During operation, the concave curved surface of the contoured clamping jaw 10 detachably mounted above the outer clamping slider 6, which is close to the hub workpiece side, fits tightly against the hub outer ring, further enhancing the fixing effect and preventing the hub from shifting or vibrating during processing; the detachable nature of the contoured clamping jaw 10 allows for easy replacement according to the shape of different hubs, thereby improving the versatility and flexibility of the device; in addition, this design not only improves the fixing accuracy and reduces processing errors, but also facilitates maintenance and replacement, thereby reducing the cost of use.

[0028] As an embodiment of the present invention, an internal fixed gear 11 is also installed between the outer fixed plate 4 and the fixed platform 1, and the internal fixed gear 11 is fixedly connected to the outer fixed plate 4. An internal fixing mechanism 12 located on the inner side of the wheel hub workpiece placement position is also evenly installed on the fixed platform 1. The internal fixing mechanism 12 fixes the wheel hub workpiece from the inner side under the transmission action of the internal fixed gear 11.

[0029] As an embodiment of the present invention, the internal fixing mechanism 12 includes: An inner fixing rod 13, wherein the inner fixing rod 13 passes through the fixed platform 1 and is rotatably connected to the fixed platform 1; A transmission gear 14, wherein the transmission gear 14 is fixedly connected to the lower end of the inner fixed rod 13, and the transmission gear 14 is meshed with the inner fixed gear 11; The cam clamp block 15 is sleeved on the portion of the upper end of the inner fixing rod 13 extending out of the fixed platform 1 , and the outer edge of the cam clamp block 15 abuts against the inner ring of the hub workpiece during the rotation of the inner fixing rod 13 .

[0030] As an embodiment of the present invention, the fixing position of the outer clamping slider 6 on the outer ring of the hub workpiece is not colinear with the fixing position of the cam clamping block 15 on the inner ring of the hub workpiece.

[0031] During operation, when the wheel hub workpiece is placed on the fixed platform 1, its weight presses the induction spring block 9 elastically installed on the platform, so that the external fixing mechanism 3 realizes the clamping and fixing of the outer ring of the wheel hub through the rotation of the external fixing plate 4. At the same time, the rotation of the external fixing plate 4 also drives the internal fixing gear 11 fixedly connected thereto to rotate. The internal fixing gear 11 is engaged with the transmission gear 14 of the internal fixing mechanism 12, driving the internal fixing rod 13 to rotate, thereby making the cam clamp 15 press the inner ring of the wheel hub to achieve internal fixation. This internal and external combined fixing method effectively disperses the fixing force through the fixed position design of the external clamping slider 6 in direct contact with the wheel hub workpiece and the cam clamp 15 for the non-colinear clamping position of the wheel hub, avoids deformation of the wheel hub caused by concentrated stress, and ensures the stability of the wheel hub during processing.

[0032] As an embodiment of the present invention, the sum of the major axis of the elliptical cam clamp 15 and the shortest distance from its side to the center of the fixed platform 1 is greater than the inner ring radius length of the hub workpiece.

[0033] As an embodiment of the present invention, a plate-like protrusion 17 extends inward from the sleeve hole 16 of the cam clamp 15 and the inner fixing rod 13, and the portion of the inner fixing rod 13 located in the sleeve hole 16 also extends outward from the same plate-like protrusion 17, and a differential spring 18 is fixedly connected between the two plate-like protrusions 17 at the sleeve hole 16 of the cam clamp 15 and the inner fixing rod 13.

[0034] As an embodiment of the present invention, the plate-like protrusion 17 of the inner fixing rod 13 in the sleeve hole 16 is also fixedly connected to a limit stop 19 on the side along the rotation direction of the inner fixing rod 13, and the differential springs 18 installed on both sides of the limit stop 19 are hard springs with a stiffness coefficient of more than 500N / m.

[0035] During operation, by selecting a hard spring for the differential spring 18, when the inner fixing rod 13 drives the cam clamp 15 to rotate, due to insufficient thrust, the differential spring 18 will not be compressed first, but the cam clamp 15 will be directly pushed to rotate by the differential spring 18 until the cam clamp 15 contacts the inner ring of the wheel hub. At this time, the inner ring of the wheel hub placed on the fixed platform 1 is positioned, and the outer clamping slider 6 of the outer fixing mechanism has not yet contacted the outer ring of the wheel hub. After that, since the sum of the long axis of the elliptical cam clamp 15 and the shortest distance from its side to the center of the fixed platform 1 is greater than the inner ring radius of the wheel hub workpiece, the cam clamp 15 is blocked and interfered by the inner ring of the wheel hub and cannot continue to rotate. However, at this time, the outer fixing plate 4 is still rotating. Therefore, the inner fixing rod 13 begins to compress the differential spring 18 until the limit stopper 19 of the inner fixing rod 13 contacts and interferes with the plate-like protrusion 17 of the sleeve hole 16. At this time, the outer fixing plate 4 just stops rotating, and the outer clamping slider 6 completes the clamping and fixing work of the outer ring of the wheel hub. By designing the differential spring 18 in the sleeve hole 16 and its related structures, the inner fixing mechanism 12 first completes the positioning of the hub workpiece, and then the outer fixing mechanism 3 completes the clamping and fixing of the hub workpiece, thereby ensuring the accurate position of the hub during the processing and avoiding processing errors caused by inaccurate positioning, thereby improving the fixing efficiency and processing accuracy of the machine tool for the hub workpiece.

[0036] The above shows and describes the basic principles, main features and significant advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments. Without departing from the spirit and scope of the present invention, the present invention may also be modified and improved to adapt to different usage environments and customer needs. These modifications and improvements fall within the scope of protection of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An internal and external bidirectional fixing device for wheel hub processing, comprising a fixing platform (1), wherein the fixing platform (1) is used to place a wheel hub workpiece to be processed; Features: The fixed platform (1) is evenly provided with T-shaped grooves (2) extending from the edge to the center. An external fixing mechanism (3) is installed below the fixed platform (1). The external fixing mechanism (3) comprises: An outer fixing plate (4), the outer fixing plate (4) being located directly below the fixed platform (1) and rotatably connected to the fixed platform (1); A power assembly (5), the power assembly (5) being used to drive the outer fixed plate (4) to perform periodic reciprocating rotation at a fixed angle; An outer clamping slide block (6), the outer clamping slide block (6) being slidably connected in the T-shaped groove (2); A transmission rod (7), the outer edge of the outer fixing plate (4) is evenly fixedly connected with a connecting column (8) identical to the lower portion of the outer clamping slider (6), the transmission rod (7) is sleeved on the connecting column (8) between the outer fixing plate (4) and the outer clamping slider (6), and is rotatably connected to the two connecting columns (8).

2. The internal and external bidirectional fixing device for wheel hub processing according to claim 1, characterized in that: A plurality of induction spring blocks (9) are elastically and evenly mounted on the upper end of the fixed platform (1) at the placement position of the outer ring of the hub workpiece in the circumferential direction, and a drive switch of the power assembly (5) is mounted in the mounting groove below the induction spring block (9).

3. The inner and outer bidirectional fixing device for wheel hub processing according to claim 2, characterized in that: The T-shaped groove (2) extends towards the center of the fixed platform (1) to the sensing spring block (9), and penetrates the entire edge of the fixed platform (1) towards the edge of the fixed platform (1).

4. The inner and outer bidirectional fixing device for wheel hub processing according to claim 1, characterized in that: A contour clamping jaw (10) is detachably mounted above the outer clamping slider (6); the contour clamping jaw (10) has a concave curved surface on the side close to the wheel hub workpiece that is the same shape as the outer ring of the wheel hub workpiece.

5. The inner and outer bidirectional fixing device for wheel hub processing according to claim 2, characterized in that: An inner fixed gear (11) is installed between the outer fixed plate (4) and the fixed platform (1), and the inner fixed gear (11) is fixedly connected to the outer fixed plate (4). An inner fixed mechanism (12) is evenly installed on the fixed platform (1) and is located inside the wheel hub workpiece placement position. The inner fixed mechanism (12) fixes the wheel hub workpiece from the inside of the wheel hub workpiece under the transmission effect of the inner fixed gear (11).

6. The inner and outer bidirectional fixing device for wheel hub processing according to claim 5, characterized in that: The internal fixing mechanism (12) comprises: An inner fixing rod (13), wherein the inner fixing rod (13) passes through the fixing platform (1) and is rotatably connected to the fixing platform (1); A transmission gear (14), wherein the transmission gear (14) is fixedly connected to the lower end of the inner fixed rod (13), and the transmission gear (14) is meshed with the inner fixed gear (11); A cam clamp (15) is sleeved on a portion of the upper end of the inner fixing rod (13) extending out of the fixing platform (1), and an outer edge of the cam clamp (15) abuts against an inner ring of the hub workpiece during the rotation of the inner fixing rod (13).

7. The inner and outer bidirectional fixing device for wheel hub processing according to claim 5, characterized in that: The fixing position of the outer clamping slide block (6) on the outer ring of the hub workpiece and the fixing position of the cam clamp block (15) on the inner ring of the hub workpiece are not colinear.

8. The inner and outer bidirectional fixing device for wheel hub processing according to claim 6, characterized in that: The sum of the major axis of the elliptical cam clamp (15) and the shortest distance from its side to the center of the fixed platform (1) is greater than the inner ring radius length of the hub workpiece.

9. The inner and outer bidirectional fixing device for wheel hub processing according to claim 8, characterized in that: A plate-like protrusion (17) extends inwardly from the sleeve hole (16) of the cam clamp (15) and the inner fixing rod (13); a portion of the inner fixing rod (13) located in the sleeve hole (16) also extends outwardly from the same plate-like protrusion (17); and a differential spring (18) is fixedly connected between the two plate-like protrusions (17) at the sleeve hole (16) of the cam clamp (15) and the inner fixing rod (13).

10. The internal and external bidirectional fixing device for wheel hub processing according to claim 9, characterized in that: The plate-shaped protrusion (17) of the inner fixing rod (13) in the sleeve hole (16) is also fixedly connected to a limit stopper (19) on the side along the rotation direction of the inner fixing rod (13), and the differential springs (18) installed on both sides of the limit stopper (19) are hard springs with a stiffness coefficient of more than 500N / m.

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