Positioning device for hub decorative hole and rim of wide and narrow edge and processing method thereof

Abstract

The present application relates to a kind of hub decorative hole and mouth along the positioning device of wide and narrow edge and its processing method.The present application includes base surface support plate, the center positioning seat is equipped on the base surface support plate, the center positioning seat is connected with the positioning core that is matched with the bottom end of hub center hole of hub semi-finished workpiece;Positioning claw is used to fix the inner rim of wheel hub on the base surface support plate;Positioning assembly includes side positioning rod passing through the spoke window of hub semi-finished workpiece, lower support plate connected to the lower end of the side positioning rod and can be 360 ° rotation and translation along a fulcrum on the base surface support plate, and spherical positioning plate movably connected to the upper end of the side positioning rod.The present application improves the precision of hub decorative hole processing, effectively controls the wide and narrow edge problem of decorative hole mouth after finish turning, and has high production efficiency and low manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of wheel hub manufacturing technology, and in particular to a positioning device and processing method for wheel hub decorative holes and the width and narrowness of the rim. Background Technology

[0002] To meet aesthetic and personalization needs, decorative studs (also known as rivets) are often installed on the outer surface of wheels. Simultaneously, in pursuit of lightweighting and precision to address current trends of high fuel consumption and increased battery range in automobiles, these studs are becoming increasingly important. Currently, the processing of decorative studs typically employs countersunk casting and pre-cast point machining processes. However, this method has extremely low processing efficiency, with casting deformation tolerances generally within ±0.8mm, and it is difficult to guarantee drilling depth. If drilling is used, it will also be affected by casting deformation, leading to inaccurate hole positions after machining, impacting the visual effect. To solve these problems and achieve mass production, there is an urgent need to develop high-quality solutions. Summary of the Invention

[0003] To address this, the present invention provides a positioning device and processing method for the decorative hole and the width and narrow edge of the rim of the wheel hub. By adopting process innovations such as semi-pre-casting of the cast surface cavity, precise positioning by machining, and integrated tool design, the accuracy and machining shape and size of the decorative hole of the wheel hub are improved. After precision machining, the problem of the width and narrow edge of the decorative hole is effectively controlled. Furthermore, the process is stable, the production efficiency is high, and the manufacturing cost is low.

[0004] To solve the above-mentioned technical problems, the present invention provides a positioning device for the hub decorative hole and the width and narrowness of the rim, comprising:

[0005] A base plate is used to place a semi-finished wheel hub workpiece. The base plate supports the inner wheel lip of the semi-finished wheel hub workpiece. A center positioning seat is provided on the base plate. The center positioning seat is connected to a positioning core that mates with the bottom end of the center hole of the semi-finished wheel hub workpiece.

[0006] The positioning claws provided on the base plate are used to fix the inner wheel lip of the hub to the base plate;

[0007] The positioning assembly includes a side positioning rod passing through the spoke window of the semi-finished wheel hub workpiece, a lower support plate connected to the lower end of the side positioning rod and capable of rotating and translating 360° along a pivot point on the base plate, and a spherical positioning plate movably connected to the upper end of the side positioning rod; wherein, one end of the spherical positioning plate is inclined upward and connected to a positioning ball, and the spherical surface of the positioning ball can fit against the window facade of the decorative nail platform of the semi-finished wheel hub workpiece.

[0008] In one embodiment of the present invention, the lower support plate is provided with an adjustment groove, and a first locking bolt connected to the base support plate is provided in the adjustment groove.

[0009] In one embodiment of the present invention, the positioning assembly further includes a rotating platform, which is vertically and rotatably connected to the upper end of the side positioning rod. The spherical positioning plate is also provided with a movable slide groove, and a second locking bolt connected to the upper end of the rotating platform is provided in the movable slide groove.

[0010] In one embodiment of the present invention, a rotating groove is provided along the lower end of the rotating table, a plug that mates with the rotating groove is provided at the upper end of the side positioning rod, and a third locking bolt is connected to the side end of the rotating table to lock the rotating table and the plug.

[0011] In one embodiment of the present invention, the side positioning rod is provided with a stepped transition structure in the axial direction, and the diameter of the side positioning rod from the lower end of the side positioning rod to the stepped transition structure is greater than the diameter of the stepped transition structure from the upper end of the side positioning rod.

[0012] In one embodiment of the present invention, the hardness of the side positioning rod is HRC≥38.

[0013] In one embodiment of the present invention, the hardness of the positioning ball is HRC≥20.3.

[0014] The present invention also provides a method for processing wheel hub decorative holes and the width and narrowness of the rim, the method comprising:

[0015] S1. Pour molten aluminum into a mold to obtain a casting blank. The casting blank is provided with multiple pre-casting platforms with demolding angles on the outer edges. The pre-casting platforms are used to form decorative nail platforms after processing. The bottom diameter of the pre-casting platform is larger than the diameter of the decorative nail to be installed. Pre-casting recesses are left on the pre-casting platform. After turning the casting blank, a semi-finished wheel hub workpiece is obtained, which includes the inner wheel lip, the center hole of the wheel hub, the spoke window, the flange plane, the decorative nail platform and its window elevation.

[0016] S2. Align the positioning core on the center positioning seat with the bottom of the center hole of the wheel hub. Then, pass the side positioning rod through the spoke window. By adjusting the positions of the lower support plate, side positioning rod, rotary table and spherical positioning plate, make the positioning ball fit against the window facade of the decorative nail table. Adjust the position of the positioning ball so that the difference between its distance to the center hole of the wheel hub and the pitch circle radius of the multiple pre-cast sockets is within ±2.5mm. Pre-tighten the first locking bolt, the second locking bolt and the third locking bolt.

[0017] S3. Tilt the spoke window through the side positioning rod, with the center hole of the hub as the radial positioning point, and place it on the outside of the positioning core. The inner wheel lip plane of the hub contacts the base plate. Rotate the semi-finished hub workpiece, loosen the first locking bolt, the second locking bolt and the third locking bolt, so that the spherical surface of the positioning ball can make point contact with the vertical surface of the decorative nail table window, and leave a gap of more than 1.5mm around the positioning ball. Tighten the first locking bolt, the second locking bolt and the third locking bolt again, and then fix the inner wheel lip of the hub to the base plate through the positioning claw.

[0018] S4. Using the positioning ball as the machining reference, the CNC machine tool controls the integrated alloy drill bit to machine the countersunk hole of the decorative nail in the pre-cast socket. The offset of the countersunk hole diameter is controlled so that it falls on the inner side of the top edge of the pre-cast socket. If it deviates in a certain direction, the machining cycle command of the CNC machine tool is adjusted. The deviation angle is adjusted by increasing or decreasing the positive and negative values ​​of the world coordinate system to ensure that the edge of the pre-cast socket is not machined. Subsequently, the bolt holes and valve holes are machined on the semi-finished wheel hub workpiece. After the machining is completed, the positioning claw releases the inner lip of the wheel hub.

[0019] S5. The semi-finished wheel hub workpiece is machined in two stages based on the center hole of the wheel hub and the inner lip plane of the wheel hub to obtain the outer rim, outer rim, cap, outer decorative surface, and decorative nail edge band. The edge band retains the original casting cavity shape to ensure that the width and narrow edges are precision machined without deviation.

[0020] In one embodiment of the present invention, the integral alloy drill bit includes a large-diameter end and a small-diameter end, wherein the diameter of the large-diameter end is 0.12-0.35 mm larger than the diameter of the decorative nail.

[0021] In one embodiment of the present invention, the concentricity deviation between the large-diameter end and the small-diameter end is no greater than 0.025 mm.

[0022] The technical solution of the present invention has the following advantages compared with the prior art:

[0023] The present invention discloses a positioning device and processing method for wheel hub decorative holes and the width and narrowness of the rim. Through process innovations such as semi-pre-casting of the cast surface cavity, precise machining positioning, and integrated tool design, the accuracy and machining shape and size of the wheel hub decorative holes are improved, and the process stability, production efficiency and manufacturing cost are high. Attached Figure Description

[0024] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the wheel hub decorative hole profile machining and positioning device of the present invention.

[0026] Figure 2 This is a schematic diagram of the wheel hub structure.

[0027] Figure 3 This is a structural diagram of an integrated alloy drill bit.

[0028] Figure 4 This is a schematic diagram of the precast platform.

[0029] Figure 5 This is a schematic diagram of the countersunk hole machining process.

[0030] Explanation of reference numerals on the accompanying drawings:

[0031] 100. Semi-finished wheel hub workpiece; 110. Inner wheel lip; 120. Wheel spoke window; 130. Decorative nail platform; 131. Window facade; 140. Precast platform; 150. Wheel hub center hole; 160. Flange plane; 200. Decorative nail; 300. Machining countersunk hole large diameter end; 400. Precast recess; 410. Theoretical cone surface; 420. Actual cone surface; 500. One-piece alloy drill bit; 510. Large diameter end; 520. Small diameter end; 600. Narrow edge precision machined surface; 700. Countersunk hole;

[0032] 1. Base plate; 11. Center positioning seat; 12. Positioning core;

[0033] 2. Positioning claw;

[0034] 3. Positioning assembly; 31. Side positioning rod; 311. Plug; 312. Stepped transition structure; 32. Lower support plate; 321. Adjustment groove; 322. First locking bolt; 33. Spherical positioning plate; 331. Moving slide; 332. Second locking bolt; 34. Positioning ball; 35. Rotary table; 351. Rotation groove; 352. Third locking bolt. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0036] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0037] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution. Example

[0039] Reference Figure 1 As shown, the positioning device for the hub decorative hole and the width and narrowness of the rim according to the present invention includes:

[0040] A base plate 1 is used to place a semi-finished wheel hub workpiece 100. The base plate 1 supports the inner wheel lip 110 of the semi-finished wheel hub workpiece 100. A center positioning seat 11 is provided on the base plate 1. The center positioning seat 11 is connected to a positioning core 12 that mates with the bottom end of the center hole 150 of the wheel hub of the semi-finished wheel hub workpiece 100.

[0041] The positioning claw 2 provided on the base plate 1 is used to fix the inner wheel lip 110 of the hub on the base plate 1;

[0042] The positioning component 3 includes a side positioning rod 31 passing through the spoke window 120 of the semi-finished wheel hub workpiece 100, a lower support plate 32 connected to the lower end of the side positioning rod 31 and capable of rotating and translating 360° along a fulcrum on the base support plate 1, and a spherical positioning plate 33 movably connected to the upper end of the side positioning rod 31; wherein, one end of the spherical positioning plate 33 is inclined upward and connected to a positioning ball 34, and the spherical surface of the positioning ball 34 can fit against the window facade 131 of the decorative nail platform 130 of the semi-finished wheel hub workpiece 100.

[0043] Specifically, the lower support plate 32 is provided with an adjustment groove 321, and the adjustment groove 321 is provided with a first locking bolt 322 connected to the base support plate 1.

[0044] Specifically, the positioning component 3 further includes a rotating platform 35, which is vertically and rotatably connected to the upper end of the side positioning rod 31. The spherical positioning plate 33 is also provided with a movable slide groove 331, and a second locking bolt 332 connected to the upper end of the rotating platform 35 is provided in the movable slide groove 331.

[0045] Specifically, a rotating groove 351 is provided along the lower end of the rotating table 35, and a plug 311 that mates with the rotating groove 351 is provided at the upper end of the side positioning rod 31. A third locking bolt 352 is connected to the side end of the rotating table 35 to lock the rotating table 35 and the plug 311.

[0046] Specifically, the side positioning rod 31 is provided with a stepped transition structure 312 in the axial direction, and the diameter of the part of the side positioning rod 31 from the lower end of the side positioning rod 31 to the stepped transition structure 312 is larger than the diameter of the part of the stepped transition structure 312 to the upper end of the side positioning rod 31.

[0047] Specifically, the hardness of the side positioning rod 31 is HRC≥38.

[0048] Specifically, the positioning ball 34 is a steel ball with a hardness of HRC≥20.3.

[0049] With the above configuration, the side positioning rod 31 passes through the spoke window 120, through the spherical surface and fits against the window facade 131 next to the decorative nail 200, which can provide precise positioning before each product processing. Example

[0050] A method for processing wheel hub decorative holes and the width and narrowness of the rim, utilizing the wheel hub decorative hole profile processing and positioning device described in Embodiment 1, the method comprising:

[0051] S1. Pour molten aluminum into a mold to obtain a casting blank. The casting blank is provided with multiple pre-casting platforms 140 with demolding angles on their outer edges. The pre-casting platforms 140 are used to form decorative nail platforms 130 after processing. The bottom diameter of the pre-casting platform 140 is not less than 0.5 mm larger than the diameter of the decorative nail 200 to be installed. The pre-casting platform 140 has a pre-casting recess 400. After turning the casting blank, a semi-finished wheel hub workpiece 100 is obtained, which includes an inner wheel lip 110, a center hole 150, a spoke window 120, a flange plane 160, a decorative nail platform 130 and its window facade 131.

[0052] S2. Align the positioning core 12 on the center positioning seat 11 with the bottom end of the hub center hole 150. Then, pass the side positioning rod 31 through the spoke window 120. By adjusting the positions of the lower support plate 32, the side positioning rod, the rotary table 35 and the spherical positioning plate 33, make the positioning ball 34 fit against the window facade 131 of the decorative nail table 130. Adjust the position of the positioning ball 34 so that the difference between its distance to the hub center hole 150 and the pitch circle radius of the multiple pre-cast sockets 400 is within ±2.5mm. Pre-lock the first locking bolt 322, the second locking bolt 332 and the third locking bolt 352.

[0053] S3. Tilt the spoke window 120 through the side positioning rod 31, with the hub center hole 150 as the radial positioning point, and place it on the outside of the positioning core 12. The inner wheel lip 110 of the hub contacts the base plate 1. Rotate the semi-finished hub workpiece 100, loosen the first locking bolt 322, the second locking bolt 332 and the third locking bolt 352, so that the spherical surface of the positioning ball 34 can make point contact with the window facade 131 of the decorative nail table 130, and leave a gap of more than 1.5mm around the positioning ball 34. Tighten the first locking bolt 322, the second locking bolt 332 and the third locking bolt 352 again, and then fix the inner wheel lip 110 of the hub to the base plate 1 through the positioning claw 2.

[0054] S4. Using the positioning ball 34 as the machining reference, the CNC machine tool controls the integrated alloy drill bit 500 to machine the countersunk hole 700 of the decorative nail 200 in the pre-cast socket 400. Since the distance between the pre-cast socket 400 and the window facade 131 of the decorative nail platform 130 is very small and the difference between the distance from the positioning ball 34 to the hub center hole 150 and the pitch circle radius of multiple pre-cast sockets 400 is very small, the diameter offset of the countersunk hole 700 can be controlled when machining it and it falls inside the top opening of the pre-cast socket 400. Control the offset of the diameter of the countersunk hole 700 so that it falls inside the top edge of the precast socket 400. If it deviates in a certain direction, adjust the machining cycle command of the CNC machine tool and adjust the deviation angle by increasing or decreasing the positive and negative values ​​of the world coordinate system to ensure that the edge of the precast socket 400 is not machined. Then, the bolt holes and valve holes are machined on the semi-finished wheel hub workpiece 100 respectively. After the machining is completed, the positioning claw 2 releases the inner wheel lip 110 of the wheel hub.

[0055] S5. Place the semi-finished wheel hub workpiece 100 in a special hydraulic three-jaw tooling, and perform secondary machining with the wheel hub center hole 150 and the inner wheel lip 110 plane as the reference to obtain the outer wheel flange, outer wheel rim, cap, outer decorative surface, and decorative nail edge band. The edge band retains the original casting cavity shape, so that the wide and narrow sides are precision machined without deviation, and an aluminum alloy wheel hub with a narrow edge precision machined surface 600 on the decorative nail edge band is obtained.

[0056] In this embodiment, the integrated alloy drill bit 500 includes a large-diameter end 510 and a small-diameter end 520. The diameter of the large-diameter end 510 is 0.12-0.35 mm larger than the diameter of the decorative nail 200. The concentricity deviation between the large-diameter end 510 and the small-diameter end 520 is no greater than 0.025 mm.

[0057] In this embodiment, the offset between the precast socket 400 and the window facade 131 of the decorative nail platform 130 ( Figure 4 (a) The depth of the 510mm diameter end drilled into the 400mm bottom wall of the pre-cast socket is not greater than 4mm. Figure 4 (b) The center deviation range between the theoretical cone surface 410 (major diameter) and the actual cone surface 420 of the precast socket 400 is not greater than 0.4 mm. Figure 5 (c and d) are within ±0.8mm; the offset between the large diameter end 510 of the integral alloy drill bit 500 and the actual conical surface 420 of the pre-cast socket 400 ( Figure 5 (e and f) are between 0.34 and 1.95 mm.

[0058] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for processing decorative holes and the width and narrowness of the rim of a wheel hub, characterized in that, A positioning device utilizing the decorative holes in the wheel hub and the width and narrowness of the rim, the positioning device includes: A base plate is used to place a semi-finished wheel hub workpiece. The base plate supports the inner wheel lip of the semi-finished wheel hub workpiece. A center positioning seat is provided on the base plate. The center positioning seat is connected to a positioning core that mates with the bottom end of the center hole of the semi-finished wheel hub workpiece. The positioning claws provided on the base plate are used to fix the inner wheel lip of the hub to the base plate; The positioning assembly includes a side positioning rod passing through the spoke window of the semi-finished wheel hub workpiece, a lower support plate connected to the lower end of the side positioning rod and capable of rotating and translating 360° along a pivot point on the base plate, and a spherical positioning plate movably connected to the upper end of the side positioning rod; wherein, one end of the spherical positioning plate is inclined upward and connected to a positioning ball, and the spherical surface of the positioning ball can fit against the window facade of the decorative nail platform of the semi-finished wheel hub workpiece. The lower support plate is provided with an adjustment groove, and a first locking bolt connected to the base support plate is provided in the adjustment groove; The positioning assembly also includes a rotating platform, which is vertically and rotatably connected to the upper end of the side positioning rod. The spherical positioning plate is also provided with a movable slide groove, and a second locking bolt connected to the upper end of the rotating platform is provided in the movable slide groove. A rotating groove is provided along the lower end of the rotating table, and a plug that mates with the rotating groove is provided at the upper end of the side positioning rod. A third locking bolt is connected to the side end of the rotating table to lock the rotating table and the plug. The method includes: S1. Pour molten aluminum into a mold to obtain a casting blank. The casting blank is provided with multiple pre-casting platforms with demolding angles on the outer edges. The pre-casting platforms are used to form decorative nail platforms after processing. The bottom diameter of the pre-casting platform is larger than the diameter of the decorative nail to be installed. Pre-casting recesses are left on the pre-casting platform. After turning the casting blank, a semi-finished wheel hub workpiece is obtained, which includes the inner wheel lip, the center hole of the wheel hub, the spoke window, the flange plane, the decorative nail platform and its window elevation. S2. Align the positioning core on the center positioning seat with the bottom of the center hole of the wheel hub. Then, pass the side positioning rod through the spoke window. By adjusting the positions of the lower support plate, side positioning rod, rotary table and spherical positioning plate, make the positioning ball fit against the window facade of the decorative nail table. Adjust the position of the positioning ball so that the difference between its distance to the center hole of the wheel hub and the pitch circle radius of the multiple pre-cast sockets is within ±2.5mm. Pre-tighten the first locking bolt, the second locking bolt and the third locking bolt. S3. Tilt the spoke window through the side positioning rod, with the center hole of the hub as the radial positioning point, and place it on the outside of the positioning core. The inner wheel lip plane of the hub contacts the base plate. Rotate the semi-finished hub workpiece, loosen the first locking bolt, the second locking bolt and the third locking bolt, so that the spherical surface of the positioning ball can make point contact with the vertical surface of the decorative nail table window, and leave a gap of more than 1.5mm around the positioning ball. Tighten the first locking bolt, the second locking bolt and the third locking bolt again, and then fix the inner wheel lip of the hub to the base plate through the positioning claw. S4. Using the positioning ball as the machining reference, the CNC machine tool controls the integrated alloy drill bit to machine the countersunk hole of the decorative nail in the pre-cast socket. The offset of the countersunk hole diameter is controlled so that it falls on the inner side of the top edge of the pre-cast socket. If it deviates in a certain direction, the machining cycle command of the CNC machine tool is adjusted. The deviation angle is adjusted by increasing or decreasing the positive and negative values ​​of the world coordinate system to ensure that the edge of the pre-cast socket is not machined. Subsequently, the bolt holes and valve holes are machined on the semi-finished wheel hub workpiece. After the machining is completed, the positioning claw releases the inner lip of the wheel hub. S5. The semi-finished wheel hub workpiece is machined in two stages based on the center hole of the wheel hub and the inner lip plane of the wheel hub to obtain the outer rim, outer rim, cap, outer decorative surface, and decorative nail edge band. The edge band retains the original casting cavity shape to ensure that the width and narrow edges are precision machined without deviation.

2. The method for processing wheel hub decorative holes and the width and narrowness of the rim according to claim 1, characterized in that, The side positioning rod has a stepped transition structure in the axial direction, and the diameter of the part of the side positioning rod from the lower end of the side positioning rod to the stepped transition structure is larger than the diameter of the part of the stepped transition structure to the upper end of the side positioning rod.

3. The method for processing wheel hub decorative holes and the width and narrowness of the rim according to claim 1, characterized in that, The hardness of the side positioning rod is HRC≥38.

4. The method for processing wheel hub decorative holes and the width and narrowness of the rim according to claim 1, characterized in that, The hardness of the positioning ball is HRC≥20.

3.

5. The processing method for the decorative hole and the width and narrow edge of the rim of a wheel hub as described in claim 1, characterized in that, The one-piece alloy drill bit includes a large-diameter end and a small-diameter end, wherein the diameter of the large-diameter end is 0.12-0.35 mm larger than the diameter of the decorative nail.

6. The method for processing wheel hub decorative holes and the width and narrowness of the rim as described in claim 5, characterized in that, The concentricity deviation between the large-diameter end and the small-diameter end is no greater than 0.025 mm.

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