CN108213464B - Tools, grooving machines and hub machining methods - Google Patents

Abstract

The invention relates to a tool, a grooving machine and a wheel hub processing method, wherein the grooving machine is provided with the tool, and the tool is provided with the main cutting surface, the auxiliary cutting surface and the barb-shaped cutting surface. Through the joint action of the above three cutting surfaces, the rim processed by the tool has a barb shape that matches the barb-shaped cutting surface. This allows the tire installed on the wheel hub to be better fixed and prevents the tire from coming off. Moreover, the one-piece hub has a metal insert in the center, and a groove is set in the center of the sample placement table of the slotting machine, so that the hub can be placed more firmly. When the positioning component is pressed, the hub can be more reliably connected to the center. The sample placement table rotates synchronously to further improve processing reliability.

Description

Tools, grooving machines and hub machining methods

Technical field

The invention relates to the field of CNC machining, and in particular to a cutting tool, a grooving machine and a wheel hub processing method.

Background technique

As a basic vehicle component, the wheel hub's performance directly affects the comfort of the vehicle. In order to improve the elasticity and deformation resistance of the wheel hub while ensuring the rigidity of the wheel hub, the wheel hub is generally manufactured by using plastic one-piece molding, and the plastic main body is integrally formed and connected to the metal insert. For wheels made in one piece, due to the mold manufacturing process, the connection between the one-piece wheel and the tire is less reliable and prone to failure.

Contents of the invention

Based on this, it is necessary to provide a tool, a grooving machine and a wheel hub processing method to reduce the occurrence of tire separation through further processing of the wheel hub.

The technical solution is as follows:

A kind of cutter, including a cutter body, one end of the cutter body is used for fixing, the end face of the other end of the cutter body is the front end face, the side of the cutter body is provided with a relief groove, and the proximity of the relief groove is The side walls of the front end surface are inclined and form a barb-shaped cutting surface with the bottom wall of the relief groove. The part of the side surface between the front end surface and the relief groove is an auxiliary cutting surface. The front end surface is connected to the relief groove. One end connected to the auxiliary cutting surface is the main cutting surface.

The above solution provides a tool. By providing the barb-shaped cutting surface on the tool, the wheel hub processed by the tool has barbs matching the barb-shaped cutting surface, which can better Connected with the tire to reduce the occurrence of tire failure. Specifically, during use, the cutting edges on both sides of the main cutting surface, the auxiliary cutting surface and the barb-shaped cutting surface of the tool are used to cut the rim of the wheel hub. As shown in Figure 1, the barbs are formed on the rim. , the tire installed on the rim will be restricted on the rim by the barbs, thereby preventing the tire from coming off.

Further, the side surface of the tool body that intersects the auxiliary cutting surface and the front end surface is a pressing surface, and the tool body has a plane perpendicular to the pressing surface and passing through the center of the tool body as a symmetry datum plane. A symmetrical structure, the end surface of the fixed end of the tool body is provided with a limiting groove, and the limiting groove is located in the middle of the end surface.

A grooving machine includes a sample placement table, a positioning assembly, a tool holder and the above-mentioned cutter. The center of the sample placement table is provided with a groove for accommodating metal inserts. The positioning assembly is relative to the The sample placement table is configured to press the wheel hub on the sample placement table. The sample placement table can drive the wheel hub to rotate. The tool is installed on the tool holder. The tool can move radially and axially relative to the rim.

The above solution provides a grooving machine. Mainly by using the above-mentioned cutter, the rim processed by the grooving machine has a barb structure, so that the tire installed on the wheel hub is not easy to fall off and reduces the occurrence of tire detachment. . Specifically, during use, the hub is placed on the sample placement table so that the protruding part of the metal insert in the center of the hub extends into the groove, and then the positioning assembly is used to press the hub on the The sample is placed on the table. Finally, the sample placement table is rotated to make the hub rotate synchronously with it, and then the tool holder is used to drive the tool to move, so that the tool makes corresponding radial and axial movements, and finally processes the rim of the wheel hub. The barbs are provided to make the tire mounted on the rim more stable and reduce the occurrence of tire detachment.

Further, the positioning assembly includes a positioning post, which is located above the groove and can extend into and be pressed against the metal insert.

Further, the positioning assembly further includes a column, a connecting rod and a support rod. The column is fixedly arranged relative to the central axis of the sample placement table. One end of the connecting rod is connected to the column. The connecting rod The other end of the support rod is connected to the support rod, the other end of the support rod is connected to the positioning post, and the support rod can move up and down relative to the connecting rod.

Further, one end of the positioning post close to the groove is a cone, and one end of the positioning post connected to the support rod is a cylinder, and the diameter of the cylinder is larger than the diameter of the central through hole of the metal insert.

Further, the slotting machine also includes a console, a rotating disk and a main motor that controls the rotation of the rotating disk. The rotating disk is arranged on the console, and the sample placing table is fixed on the rotating disk. superior.

Further, the sample placement platform includes a support column and a supporting tray arranged coaxially, the supporting column is supported between the rotating disk and the supporting tray, and the groove is located in the center of the supporting tray.

Further, the grooving machine further includes a track assembly for controlling the horizontal movement and vertical movement of the tool holder. The track assembly includes a horizontal guide rail and a vertical guide rail. The tool holder is slidably connected to the tool holder. On the vertical guide rail, the vertical guide rail is slidingly connected to the horizontal guide rail.

A wheel hub processing method, using the above-mentioned grooving machine, placing the wheel hub on the sample placement table so that the protruding part of the metal insert of the wheel hub extends into the groove, and using the positioning assembly to place the wheel hub. The wheel hub is pressed on the sample placing table, and the sample placing table is rotated to drive the wheel hub to rotate, and the tool is moved according to a predetermined trajectory, so that the main cutting surface, the auxiliary cutting surface and the barb-shaped cutting surface are The rim of the hub is cut together to form barbs in the rim.

The above wheel hub processing method uses the aforementioned slotting machine to process the wheel hub and processes the barb shape on the rim to increase the stability of the connection between the tire and the rim and reduce the occurrence of tire failure. The specific processing process is as follows: first, the wheel hub to be processed is placed on the sample placement table. Based on the center of the hub, there is a metal insert integrally connected to the plastic body. When the hub is placed on the sample placement table, it is necessary to make the part of the metal insert protruding from the plastic body extend into the groove in the center of the sample placement stage. . Then the positioning assembly is used to press the wheel hub on the sample placement table, so that when the sample placement table rotates, the wheel hub can follow the rotation. When the wheel hub and the sample placement table rotate synchronously, the tool holder is driven to move according to the predetermined processing route, so that the main cutting surface, auxiliary cutting surface and barb-shaped cutting surface are jointly processed on the rim of the wheel hub Out of barb type. During the use of the wheel hub processed by the above method, the tire installed on the rim is restricted and fixed by the barbs on the rim, which effectively reduces the occurrence of tire separation.

Description of the drawings

Figure 1 shows the rim and tire assembly diagram;

Figure 2 is a schematic structural diagram of the tool in this embodiment;

Figure 3 is a schematic structural diagram of the tool from another perspective in this embodiment;

Figure 4 is a schematic structural diagram of the slotting machine described in this embodiment;

Figure 5 is a front view of the slotting machine described in this embodiment;

Figure 6 shows the hub described in this embodiment.

Explanation of reference symbols:

10. Grooving machine, 11. Console, 12. Sample placement table, 121. Support column, 122. Supporting tray, 1221. Groove, 13. Positioning component, 131. Positioning column, 132. Upright column, 133. Connection Rod, 134. Support rod, 14. Tool holder, 15. Rotating disk, 16. Track assembly, 161. Horizontal guide rail, 162. Vertical guide rail, 17. Auxiliary motor, 20. Wheel hub, 21. Plastic body, 211. Rim, 2111, barb, 22, metal insert, 30, tire, 40, tool, 41, main cutting surface, 42, auxiliary cutting surface, 43, relief groove, 44, barb type cutting surface, 45, limit Slot, 46, pressing surface.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough understanding of the disclosure of the present invention will be provided.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may also be intervening elements present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in Figures 2 and 3, a tool 40 is provided in one embodiment, including a tool body. One end of the tool body is used for fixation. The end surface of the other end of the tool body is a front end surface. A relief groove 43 is provided on the side of the tool body. The side wall of the relief groove 43 close to the front end surface is inclined and forms a barb-shaped cutting surface 44 with the bottom wall of the relief groove 43. The side surface is located at The portion between the front end surface and the relief groove 43 is the auxiliary cutting surface 42 , and one end of the front end surface connected to the auxiliary cutting surface 42 is the main cutting surface 41 .

The integrally formed wheel hub 20 has a metal insert 22 in the center. Due to the mold manufacturing process of the plastic body 21, the installation connection between the processed wheel hub 20 and the tire 30 is not stable enough and may easily come off. In the above embodiment, a cutter 40 is provided to further process the integrally formed wheel hub 20, and barbs 2111 are processed on the rim 211, so that the connection between the rim 211 and the tire 30 is closer, and the occurrence of the wheel hub 20 is reduced. . Specifically, as shown in Figures 2 and 3, during the processing, one end of the tool 40 is connected to the machine tool to fix the tool 40, and the other end of the tool 40 is used to cut the rim 211. Based on the tool 40, the rim 211 is cut. One end of the wheel is provided with the main cutting surface 41, the auxiliary cutting surface 42 and the barb-shaped cutting surface 44, so that the processed rim 211 will obtain a shape matching the barb-shaped cutting surface 44. As shown in Figure 1, the processed rim 211 has barbs 2111, and the tire 30 installed on the rim 211 is stuck in the rim 211, effectively preventing the tire from coming off.

The tool in the above solution processes the rim 211 by arranging the main cutting surface 41, the auxiliary cutting surface 42 and the barb-shaped cutting surface 44, so that the rim 211 generates barbs 2111. Specifically, the rim as shown in Figure 1 has two barbs 2111. On the one hand, the barbs 2111 on the other side can be processed by turning the hub 20 first and then processing the barbs 2111 on the other side, or by turning the tool 40. Work further on the barb on the other side. Further, in order to improve processing efficiency, as shown in Figure 2, in one embodiment, the tool 40 has a symmetrical structure, and the side of the tool body that intersects the auxiliary cutting surface 42 and the front end surface is a pressing surface. 46. The tool body is a symmetrical structure with the plane perpendicular to the pressing surface 46 and passing through the center of the tool body being the symmetry reference plane. By designing the tool body to have a symmetrical structure, the machining process of the two barbs 2111 can be completed through a reasonable tool movement without turning the hub 20 or the tool 40 to achieve it. During use, the two pressing surfaces 46 are mainly used for clamping during installation, restricting the movement of the tool 40 relative to the tool holder 14 in the horizontal direction parallel to the main cutting surface 41, so that the hub 211 rotates During the process, the tool 40 can make tangential movement relative to the rim 211. During use, the cutter 40 also needs to feed in the radial direction of the hub 20. In order to ensure that the cutter 40 has sufficient feed force, as shown in Figure 2, an end surface of the fixed end of the cutter body is provided. There is a limiting groove 45 located in the middle of the end surface. During use, the convex block in the tool holder 14 abuts the limiting groove 45 to limit the movement of the tool 40 in the radial direction of the hub 20 .

As shown in Figures 4 and 5, another embodiment provides a grooving machine 10, which includes a sample placement table 12, a positioning assembly 13, a tool holder 14 and the above-mentioned cutter 40. The center of the placement platform 12 is provided with a groove 1221 for accommodating the metal insert 22. The positioning assembly 13 is arranged relative to the sample placement stage 12 and is used to press the hub 20 onto the sample placement stage 12. , the sample placement table 12 can drive the hub 20 to rotate, the cutter 40 is installed on the cutter holder 14, and the cutter 40 can move radially and axially relative to the rim 211.

The grooving machine 10 provided in the above solution mainly processes the wheel hub 20 by using the tool 40 described in the above embodiment, so that the rim 211 of the processed wheel hub 20 has barbs 2111, and the tire 30 installed on the rim 211 is It can be better clamped and effectively prevent the occurrence of detachment. Moreover, as shown in FIG. 6 , the one-piece hub 20 has a metal insert 22 in the center, and both ends of the metal insert 22 protrude from the plastic body 21 . The traditional sample placement table 12 cannot adapt to this feature of the hub 20 well. characteristic. In order to realize the processing of the wheel hub 20, this solution provides the groove 1221 in the center of the sample placement table 12, so that the wheel hub 20 installed on the sample placement table 12 can be better fixed, and then uses the groove 1221 relative to the sample placement table 12. The positioning assembly 13 provided on the sample placement stage 12 presses the hub 20 on the sample placement stage 12 . The hub 20 that is pressed on the sample placement table 12 rotates with the sample placement table 12, and then clamps the tool 40 on the tool holder 14. When the tool holder 14 moves according to the predetermined trajectory, the The main cutting surface 41, the auxiliary cutting surface 42 and the barb-shaped cutting surface 44 perform a cutting process on the rim 211, and the barbs 2111 as shown in Figure 1 are processed on the rim 211.

Furthermore, the grooving machine 10 described in the above embodiment ensures that the hub 20 on the sample placement table 12 can be pressed against the sample placement table 12 through the arrangement of the positioning assembly 13, so that the hub 20 can be moved along with the positioning assembly 13. The sample placement table 12 rotates to realize the processing process. The specific structure of the positioning assembly 13 can be in various forms. For example, a locking unit can be further provided in the groove 1221 in the center of the sample placement stage 12 so that the hub 20 is placed on the sample placement stage 12 . Afterwards, the part of the metal insert 22 that extends into the groove 1221 is locked by the locking unit, so that the hub 20 is fixed on the sample placing table 12 . Specifically, the locking unit may include a plurality of compression rods with one end connected to the bottom wall of the groove 1221 and the other end capable of pressing against the inner wall of the metal insert 22 . A plurality of compression rods are evenly distributed in the groove 1221 in the circumferential direction.

Or in one embodiment, as shown in FIG. 4 , the positioning component 13 includes a positioning post 131 , which is located above the groove 1221 and can extend into and press against the metal insert. 22 on. During use, the positioning post 131 is pressed against the metal insert 22 so that the metal insert 22 rotates along with the sample placement table 12 , and the relationship between the metal insert 22 and the positioning post 131 occurs. Friction rotates.

Moreover, further, the fixation of the positioning post 131 in the above-mentioned positioning assembly 13 may be provided by an external device to support and position the positioning post 131 . Or as shown in Figure 5, the positioning assembly 13 also includes a column 132, a connecting rod 133 and a support rod 134. The column 132 is fixedly arranged relative to the central axis of the sample placement table 12, and the connecting rod 133 One end is connected to the upright column 132, the other end of the connecting rod 133 is connected to the support rod 134, the other end of the support rod 134 is connected to the positioning column 131, the support rod 134 can be relative to the The connecting rod 133 moves up and down.

During use, the position of the positioning post 131 is adjusted by moving the support rod 134. When the positioning post 131 reaches the appropriate position, the support rod 134 and the connecting rod 133 are then fixed to ensure that the positioning post 131 can press Tightly on the metal insert 22. Moreover, the main function of the positioning post 131 is to compress the metal insert 22. Specifically, the positioning post 131 can be provided on the end surface close to the sample placement table 12 to match the metal insert 22. annular groove, so that during the rotation of the metal insert 22, the end of the metal insert 22 can always be located in the annular groove.

Or specifically, as shown in FIGS. 4 and 5 , one end of the positioning post 131 close to the groove 1221 is a cone, and one end of the positioning post 131 connected to the support rod 134 is a cylinder. The diameter is larger than the diameter of the central through hole of the metal insert 22 . During use, one end of the cone is inserted into the metal insert 22 of the hub 20 placed on the sample placement stage 12 , while the cylindrical part is limited outside the metal insert 22 , thereby affecting the metal insert 22 Limit the effect of compression. Alternatively, the positioning post 131 is configured as a cone as a whole, and the maximum diameter of the cone is larger than the diameter of the central through hole of the metal insert 22 . In this way, the front end of the positioning post 131 can extend into the metal insert 22, and the rear part is pressed against the metal insert 22, thereby achieving the effect of compressing and positioning the metal insert 22.

As further shown in Figures 4 and 5, in one embodiment, in order to further improve the rotation performance of the sample placing table 12, a console 11, a rotating disk 15 and a control console 11 are further provided in the slotting machine 10. The main motor rotates 15, the rotating disk 15 is arranged on the console 11, and the sample placing table 12 is fixed on the rotating disk 15.

Specifically, as shown in FIG. 4 , in one example, the sample placing platform 12 includes a coaxially arranged support column 121 and a supporting tray 122 . The supporting column 121 is supported on the rotating disk 15 and the supporting tray 122 . 122 , the groove 1221 is located in the center of the supporting tray 122 . During the design process, in order to ensure the existence of the groove 1221 and to ensure that the hub 20 on the sample placement table 12 can be at a certain height from the console 11, it is convenient for the tool 40 to cut the rim 211. The sample placement platform 12 is configured to include two parts: a support column 121 and a supporting tray 122 . The groove 1221 is located in the center of the supporting plate 122 , and the groove 1221 can extend all the way into the support column 121 .

Further, in one embodiment, as shown in FIG. 4 , the grooving machine 10 further includes a track assembly 16 for controlling the horizontal movement and vertical movement of the tool holder 14 . The track assembly 16 includes a horizontal Guide rail 161 and vertical guide rail 162, the tool holder 14 is slidably connected to the vertical guide rail 162, and the vertical guide rail 162 is slidably connected to the horizontal guide rail 161. During use, the movement of the tool 40 is controlled by moving the vertical rail and the tool holder 14, and the barbs 2111 are processed on the rim 211 according to a predetermined processing path.

Further specifically, as shown in Figure 4, the slotting machine 10 also includes an auxiliary motor 17 for controlling the movement of the track assembly 16. The auxiliary motor 17 is provided on the console 11. The console 11 is provided with a control panel for controlling the movement trajectory of the tool 40 . During use, corresponding instructions are input through the control panel to control the tool 40 to move according to a certain trajectory to complete the processing process.

In another embodiment, a method for processing the wheel hub 20 is provided. Using the slotting machine 10 described in any of the above embodiments, the wheel hub 20 is placed on the sample placement table 12 so that the wheel hub 20 is The protruding part of the metal insert 22 extends into the groove 1221, and the positioning assembly 13 is used to press the hub 20 on the sample placing table 12, rotate the sample placing table 12, and drive the The hub 20 rotates and moves the tool 40 according to a predetermined trajectory, so that the main cutting surface 41, the auxiliary cutting surface 42 and the barb-shaped cutting surface 44 jointly cut the rim 211 of the hub 20, forming barbs 2111 in the rim 211. .

By using the above processing method, the barb 2111 type shown in Figure 1 is cut on the rim 211 part of the hub 20. Specifically, the wheel hub 20 to be processed is first placed on the sample placement table 12, and then the positioning assembly 13 is used to press the wheel hub 20 on the sample placement table 12, so that the wheel hub 20 can follow the sample placement table 12 to rotate. . Thereby, the tool 40 is moved according to the predetermined path, and the main cutting surface 41, the auxiliary cutting surface 42 and the barb-shaped cutting surface 44 of the tool 40 work together on the rim 211 of the hub 20 to process the barb 2111. This allows the tire 30 installed on the rim 211 to be better fixed and less likely to come off.

More specifically, in the wheel hub 20 processing method, the specific cutting process of the tool 40 is: first, the tool 40 is moved to a suitable position along the axis direction of the wheel hub 20, so that the main cutting surface 41 is opposite to the rim 211, and the The main cutting surface 41 is arranged parallel to the axis of the hub 20, and then the tool 40 is moved in the radial direction of the hub 20, so that the main cutting surface 41 of the tool 40 extends into the rim 211 to a certain depth. Then the tool 40 is slightly moved axially along the hub 20 so that the auxiliary cutting surface 42 of the tool 40 cuts the rim 211 to a certain depth. Finally, the tool 40 is moved along the radial direction of the hub 20 in a direction away from the hub 20, so that the barb-shaped cutting surface 44 of the tool 40 cuts the rim 211, and a barb 2111 is formed on the rim 211.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.

The above-mentioned embodiments only express several implementation modes of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims (10)

1. A tool, characterized in that the tool is used for processing wheel rims; the tool includes a tool body, one end of the tool body is used for fixing, and the end surface of the other end of the tool body is the front end surface, and the A relief groove is provided on the side of the tool body. The side wall of the relief groove close to the front end surface is inclined and forms a barb-shaped cutting surface with the bottom wall of the relief groove. The side surface is located between the front end surface and the relief groove. The part between the slots is the auxiliary cutting surface, and the end where the front end surface is connected to the auxiliary cutting surface is the main cutting surface; The side of the tool body that intersects the auxiliary cutting surface and the front end surface is the pressing surface, and the tool body is a symmetrical structure with a surface perpendicular to the pressing surface and passing through the center of the tool body as the symmetry datum plane. ; The tool is configured to machine barbs from the rim that match the barb-shaped cutting surface. 2. The tool according to claim 1, characterized in that the end surface of the fixed end of the tool body is provided with a limiting groove, and the limiting groove is located in the middle of the end surface. 3. A grooving machine, characterized in that it includes a sample placing table, a positioning assembly, a tool holder and a tool according to claim 1 or 2, the center of the sample placing table is provided with a metal insert for accommodating it. The positioning assembly is arranged relative to the sample placing table and is used to press the wheel hub on the sample placing table. The sample placing table can drive the wheel hub to rotate, and the tool Mounted on the tool holder, the tool can move radially and axially relative to the rim. 4. The slotting machine according to claim 3, characterized in that the positioning assembly includes a positioning post, the positioning post is located above the groove and can extend into and press against the metal insert. superior. 5. The slotting machine according to claim 4, characterized in that the positioning assembly further includes a column, a connecting rod and a support rod, the column is fixedly arranged relative to the central axis of the sample placing table, and the One end of the connecting rod is connected to the upright column, the other end of the connecting rod is connected to the support rod, the other end of the support rod is connected to the positioning column, and the support rod can move up and down relative to the connecting rod. move. 6. The slotting machine according to claim 5, characterized in that one end of the positioning column close to the groove is a cone, and one end of the positioning column connected to the support rod is a cylinder, and the end of the positioning column is a cylinder. The diameter is larger than the diameter of the central through hole of the metal insert. 7. The slotting machine according to any one of claims 3 to 6, further comprising a console, a rotating disk and a main motor for controlling the rotation of the rotating disk, the rotating disk being arranged on the console The sample placing platform is fixed on the rotating disk. 8. The slotting machine according to claim 7, wherein the sample placing platform includes a support column and a supporting tray arranged coaxially, and the supporting column is supported between the rotating disk and the supporting tray, The groove is located in the center of the tray. 9. The grooving machine according to claim 7, further comprising a track assembly for controlling the horizontal movement and vertical movement of the tool holder, the track assembly including a horizontal guide rail and a vertical guide rail, the The tool holder is slidably connected to the vertical guide rail, and the vertical guide rail is slidably connected to the horizontal guide rail. 10. A wheel hub processing method, characterized in that, using the grooving machine according to any one of claims 3 to 9, the wheel hub is placed on the sample placement table so that the metal insert protruding part of the wheel hub Stretch into the groove, use the positioning component to press the hub on the sample placing table, rotate the sample placing table, drive the wheel hub to rotate, and move the tool according to a predetermined trajectory, The main cutting surface, the auxiliary cutting surface and the barb-shaped cutting surface jointly cut the rim of the wheel hub to form barbs in the rim.