A double-sided chamfering tool for automobile wheel hub

Abstract

The present application belongs to the technical field of matched tool of boring machine or machining center, and particularly relates to a chamfering tool for front and back face of automobile wheel hub. The tool comprises a tool bar, the tool bar comprises a mounting rod and a tool holder connected with each other, a first blade mounted on the tool holder, the first blade having a first cutting edge and a second cutting edge, the first blade having multiple installation states, wherein: in the first installation state, the first cutting edge is used for front face chamfering and the second cutting edge is used for back face chamfering; in the second installation state, the first cutting edge is used for back face chamfering and the second cutting edge is used for front face chamfering; the first cutting edge and the second cutting edge are used for chamfering of different types or chamfering of the same type but different specifications; the first cutting edge and the second cutting edge are used for chamfering of the same type and specification in any installation state; the first blade switches the installation state by turning over. The present application can complete the switching of the installation state by turning over the first blade, reduces the time for replacing the tool, and effectively improves the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of cutting tool technology for boring machines or machining centers, and particularly relates to a cutting tool for chamfering the front and back sides of automobile wheel hubs. Background Technology

[0002] Because wheel hubs are subjected to alternating and impact loads over long periods, sharp edges are prone to stress concentration. Repeated stress can gradually lead to cracks and eventually fracture. Chamfering (including bevels and rounded corners) smoothly transitions the edges, disperses stress, significantly improves fatigue life, and ensures driving safety. Furthermore, chamfering at bolt holes or center holes on the wheel hub acts as a guide, facilitating the insertion of bolts or axle heads; it also prevents sharp edges from scratching bolt threads or axle head mating surfaces, and prevents burrs from causing poor fit (ensuring assembly accuracy and reliable locking).

[0003] Since the bolt holes, center holes, and heat dissipation holes of automobile wheel hubs all require chamfering on both sides, a chamfering tool for both sides has been designed to improve efficiency. For example:

[0004] Patent application number CN201621491355.6 discloses an inner hole chamfering tool for chamfering both ends of the inner hole of a workpiece. It includes a tool holder, a chamfering tool for the reverse side, and a chamfering tool for the front side. A chamfering tool mounting platform is provided on one side of the front end of the tool holder, and the chamfering tool is mounted on the platform via a chamfering tool support shaft. A chamfering tool mounting platform is provided on one side of the rear end of the tool holder, and the chamfering tool is mounted on the platform via a chamfering tool support shaft. Both the chamfering tool and the chamfering tool are square inserts, and both can rotate around the chamfering tool support shaft, allowing one side of the insert to extend into the inner hole of the workpiece to complete the chamfering process.

[0005] Using the above method, it is not necessary to swap the two ends of the workpiece, and the front and back chamfering of the workpiece can be completed with a single tool.

[0006] However, due to the unique structure of the wheel hub, various types of chamfering processes are required on both the front and back of the wheel hub. Taking aluminum alloy wheel hubs as an example, the outermost edge of the rim on the front of the wheel hub is rounded to eliminate sharp edges, preventing scratches to personnel and tires during use or disassembly, while also improving the appearance. The center decorative cover mounting port on the front of the wheel hub uses a chamfered angle to provide guidance for the installation of the decorative cover and facilitate alignment. On the back of the wheel hub, the flange bolt holes at both ends are chamfered to guide bolt insertion, remove machining burrs, and prevent scratching the bolt threads. In addition, the end hole of the center axle hole on the back of the wheel hub uses a rounded angle to reduce assembly stress concentration, protect the axle hole mating surface, and adapt to axle installation.

[0007] For the aforementioned wheel hubs, when using chamfering tools on both sides, operators typically need to change the cutting inserts on the tool to complete the machining process.

[0008] The machining scheme for changing the cutting blades is as follows: First, use the two cutting blades of the positive and negative chamfering cutter (taking the example of both cutting blades of the positive and negative chamfering cutter machining rounded corners) to machine the rounded corners of the front and back of the wheel hub in turn. Then, change the cutting blades (both cutting blades of the replacement cutter machine beveled corners) to machine the beveled corners of the front and back of the wheel hub in turn.

[0009] This approach has the following problems: First, it requires replacing the blade twice; second, each blade replacement requires recalibration, and the combination of these two issues during mass production results in a significant time loss. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide two types of chamfering tools for automobile wheel hubs on both the front and back sides, in order to solve the technical problems mentioned in the background art.

[0011] In a first aspect, the present invention provides a chamfering tool for both the front and back surfaces of an automobile wheel hub, comprising:

[0012] The tool holder includes a mounting rod and a tool post that are connected to each other;

[0013] The first blade is mounted on the blade holder and has a first cutting edge and a second cutting edge.

[0014] The first cutting tool has at least two mounting states at the tool holder, wherein:

[0015] In the first installation state, the first cutting edge is used for chamfering the front side, and the second cutting edge is used for chamfering the back side.

[0016] In the second installation state, the first cutting edge is used for chamfering the reverse side, and the second cutting edge is used for chamfering the front side.

[0017] The chamfer types processed by the first cutting edge and the second cutting edge are different, or the chamfer types processed by the first cutting edge and the second cutting edge are the same but the specifications are different;

[0018] The type and specifications of the chamfer processed by the first cutting edge are the same in both the first and second installation states; the type and specifications of the chamfer processed by the second cutting edge are the same in both the first and second installation states.

[0019] Switching between the first and second installation states is achieved by flipping the device.

[0020] Optionally, one of the first and second cutting edges may be machined with a chamfer, while the other may be machined with a rounded corner;

[0021] Alternatively, both the first and second cutting edges are machined with rounded corners, but the specifications of the rounded corners are different.

[0022] Alternatively, both the first and second cutting edges are machined with bevels, but the specifications of the bevels are different.

[0023] Optionally, the first blade is detachably connected to the tool holder, and can be switched between a first installation state and a second installation state by flipping the first blade.

[0024] Optional, also includes:

[0025] In either the first installation state or the second installation state, the first connecting mechanism connects and fixes the first blade to the tool holder.

[0026] In either the first or second installation state, the first positioning mechanism is used to define the position of the first blade relative to the tool holder.

[0027] Optionally, the first connecting mechanism includes:

[0028] In either the first or second mounting state, the fastener secures the first blade to the tool holder.

[0029] Optionally, the first positioning mechanism includes:

[0030] A limiting groove extends from at least one side of the tool holder. In either the first or second mounting state, the limiting groove is used to position the first blade.

[0031] Optionally, the tool holder and the mounting rod are detachably connected, allowing switching between a first and a second mounting state by flipping the tool holder.

[0032] Optionally, both the first and second cutting edges are double-edged.

[0033] Secondly, the present invention provides a chamfering tool for both the front and back surfaces of an automobile wheel hub, comprising:

[0034] The tool holder has a mounting end and a cutting end at its two ends, respectively.

[0035] Tool holder, the tool holder is mounted on the cutting end of the tool holder;

[0036] The second and third blades have a first cutting edge and a second cutting edge, respectively. Both the second and third blades are mounted on the tool holder and are arranged sequentially along the axis of the tool holder. The first and second cutting edges are arranged opposite to each other.

[0037] The tool holder has at least two assembly states at the tool shank, wherein:

[0038] In the first assembled state, the first cutting edge is used for chamfering the front side, and the second cutting edge is used for chamfering the back side.

[0039] In the second assembly state, the first cutting edge is used for chamfering the reverse side, and the second cutting edge is used for chamfering the front side.

[0040] The chamfer types processed by the first cutting edge and the second cutting edge are different, or the chamfer types processed by the first cutting edge and the second cutting edge are the same but the specifications are different;

[0041] The type and specifications of the chamfer processed by the first cutting edge in the first assembly state or the second assembly state are the same, and the type and specifications of the chamfer processed by the second cutting edge in the first assembly state or the second assembly state are the same.

[0042] The tool holder switches between the first and second assembly states by flipping.

[0043] Optionally, one of the first and second cutting edges is machined with a chamfer, while the other is machined with a fillet;

[0044] Alternatively, both the first and second cutting edges are machined with fillets, but the fillet specifications of the two are different;

[0045] Alternatively, both the first and second cutting edges are machined with bevels, but the bevel specifications of the two are different.

[0046] Optional, also includes:

[0047] In either the first or second assembly state, the second connecting mechanism connects and fixes the tool holder and the tool bar.

[0048] In either the first or second assembly state, the second positioning mechanism is used to define the position of the tool holder relative to the tool shank.

[0049] Optionally, the second connecting mechanism includes:

[0050] Connecting rod, which is fixedly mounted on the cutting end of the tool holder and is coaxial with the tool holder;

[0051] The connecting hole passes through the tool holder, and the connecting rod and the connecting hole are clearance fit.

[0052] The limiting component is detachably connected to the connecting rod.

[0053] The tool holder is connected to the tool bar via a limiting component and a connecting rod.

[0054] Optionally, the limiting element and the connecting rod are connected by threads.

[0055] Optionally, the second positioning mechanism includes:

[0056] The first positioning element is disposed on the tool holder and / or the limiting element;

[0057] The second positioning element is provided at both ends of the tool holder;

[0058] The second positioning element engages with the first positioning element to define the position of the tool holder relative to the tool shank.

[0059] Optionally, one of the first positioning element and the second positioning element is a positioning post, and the other is a positioning hole.

[0060] Optionally, both the positioning pin and the positioning hole are conical, and both have the same taper.

[0061] Optionally, the positioning pin is set at one end of the limiting member near the tool holder, the positioning hole and the connecting hole are coaxially arranged, and positioning holes are provided at both ends of the tool holder.

[0062] Optionally, both the first and second cutting edges are double-edged.

[0063] Compared with the prior art, the beneficial effects of the present invention are:

[0064] The first solution of the present invention addresses the problem that different types or specifications of chamfers need to be processed on both sides of the wheel hub. By flipping the first blade or flipping the tool holder, the switching between the first installation state and the second installation state can be completed, which reduces the time for changing tools and improves production efficiency.

[0065] This solution limits the first and second cutting edges to produce chamfers of different types or the same type but different specifications. Specifically, the first cutting edge produces chamfers of the same type and specifications in both the first and second mounting states. Furthermore, in the first mounting state, the first cutting edge can perform chamfering on the front of the wheel hub, and the second cutting edge can perform chamfering on the back of the wheel hub. In the second mounting state, the first cutting edge can perform chamfering on the back of the wheel hub, and the second cutting edge can perform chamfering on the front of the wheel hub. Through these settings, the problem of needing to process chamfers of different types or specifications on both sides of the wheel hub can be solved by simply flipping the wheel hub to switch mounting states, thus completing the processing.

[0066] The second solution of the present invention addresses the problem that different types or specifications of chamfers need to be processed on both sides of the wheel hub. By flipping the tool holder, the switching between the first assembly state and the second assembly state can be completed, reducing the time for changing tools and improving production efficiency.

[0067] This solution defines the second and third cutting blades as sequentially arranged along the tool holder axis, and defines the first cutting edge of the second blade and the second cutting edge of the third blade as facing away from each other; it defines the second and third cutting edges as processing chamfers of different types or the same type but different specifications; it defines the first cutting edge as processing chamfers of the same type and specifications in both the first and second assembly states, and the second cutting edge as processing chamfers of the same type and specifications in both the first and second assembly states; it defines the first cutting edge as capable of performing chamfering on the front of the wheel hub and the second cutting edge as capable of performing chamfering on the back of the wheel hub in the first assembly state; and the first cutting edge as capable of performing chamfering on the back of the wheel hub and the second cutting edge as capable of performing chamfering on the front of the wheel hub in the second assembly state. Through these settings, the problem of processing chamfers of different types or the same type but different specifications on both sides of the wheel hub can be solved by simply flipping and switching the tool holder assembly state. Attached Figure Description

[0068] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0069] Figure 1 This is a perspective view of the present invention;

[0070] Figure 2 This is a top view of the limiting groove of the present invention;

[0071] Figure 3 This is a schematic diagram of the first installation state of the first blade of the present invention;

[0072] Figure 4 This is a schematic diagram of the second mounting state of the first blade of the present invention;

[0073] Figure 5 This is a schematic diagram of the fastener structure of the first connecting mechanism of the present invention;

[0074] Figure 6 This is a side view of the first blade of the present invention;

[0075] Figure 7 This is a schematic diagram of the tool holder structure of the present invention;

[0076] Figure 8 This is a schematic diagram of the structure of the second connecting mechanism and the second positioning mechanism of the present invention;

[0077] Figure 9 This is a top view of the limiting member of the present invention.

[0078] In the diagram: 1. Tool holder; 11. Notch; 12. Mounting rod; 13. Tool post; 2. First blade; 21. First cutting edge; 22. Second cutting edge; 3. Tool holder; 4. First connecting mechanism; 41. Fastener; 42. Connecting hole; 43. Through hole; 5. Second connecting mechanism; 51. Connecting rod; 52. Connecting hole; 53. Limiting element; 6. First positioning mechanism; 61. Limiting groove; 62. First positioning surface; 63. Second positioning surface; 7. Second positioning mechanism; 71. First positioning element; 72. Second positioning element; 8. Second blade; 81. First cutting edge; 9. Third blade; 91. Second cutting edge. Detailed Implementation

[0079] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0080] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0081] Example 1

[0082] refer to Figure 1-6 This embodiment provides a chamfering tool for automotive wheel hubs. The tool has a tool holder 1, the upper end of which is a mounting rod 12, which is connected and fixed to the machine tool spindle, allowing the machine tool spindle to rotate and drive the tool holder 1 to rotate. The lower end of the tool holder 1 is a tool post 13, with the mounting rod 12 connected and fixed to the tool post 13. A first cutting insert 2 for chamfering is mounted on the tool post 13, and the rotation of the tool holder 1 drives the first cutting insert 2 to rotate for chamfering.

[0083] The first insert 2 is provided with a first cutting edge 21 and a second cutting edge 22 for chamfering. Specifically, refer to... Figure 3 , Figure 4 The first cutting edge 21 and the second cutting edge 22 are integrated into the same first blade 2.

[0084] It should be noted that the shapes of the first cutting edge 21 and the second cutting edge 22 are not limited.

[0085] It should be noted that the first cutting edge 21 and the second cutting edge 22 are integrated into the first blade 2, and the two are arranged sequentially along the vertical direction. (Reference) Figure 3 , Figure 4 The first cutting edge 21 and the second cutting edge 22 can be connected to each other; see reference. Figure 6 A transition area can also be set between the two.

[0086] It should be noted that in this solution, the chamfer types or specifications processed by the first cutting edge 21 and the second cutting edge 22 are different. Specifically, the first case is (not shown in the figure): one of the first cutting edge 21 and the second cutting edge 22 is processed with a rounded corner, and the other is processed with a bevel; the second case is (not shown in the figure): both the first cutting edge 21 and the second cutting edge 22 are processed with rounded corners, but the specifications of the rounded corners processed by the two are not the same; see reference. Figure 1 , Figure 3 , Figure 4 The third case is that both the first cutting edge 21 and the second cutting edge 22 are machined with bevels, but the specifications of the bevels are not the same.

[0087] It should be noted that bevel specifications refer to different bevel angles, or different chamfer circumferential lengths even with the same bevel angle. Those skilled in the art will understand that when the bevel angles are the same but the chamfer circumferential lengths are different, multiple cutting tools or a single cutting tool can be used for machining. However, machining with a single cutting tool places higher demands on the machining program and the machine tool used.

[0088] It should be noted that, for ease of description, the following embodiments will be illustrated by taking the example that both the first cutting edge 21 and the second cutting edge 22 are machined with bevels.

[0089] It should be noted that the chamfering referred to in this invention specifically includes two types: rounded corners and beveled corners.

[0090] It should be noted that in existing technologies, when multiple types of chamfering processes are required on both the front and back of the wheel hub, this can also be achieved by changing the cutting tools. The specific processing scheme is as follows: first, the rounded corners on the front and back of the wheel hub are processed sequentially using a chamfering tool (taking an example where both blades of the chamfering tool process rounded corners). Then, the chamfers on the front and back of the wheel hub are processed sequentially by changing the cutting tools (the replacement tool has both blades processing bevels). However, compared to the blade-changing scheme in the background technology, the cutting tool scheme requires two cutting tools, which leads to an increase in costs related to tool procurement, storage, and maintenance.

[0091] In this embodiment, the first blade 2 has at least two mounting states on the tool holder 13, wherein:

[0092] refer to Figure 3In the first installation state, the first cutting edge 21 faces downward in the vertical direction and can process the front side of the workpiece; the second cutting edge 22 faces upward in the vertical direction and can process the back side of the workpiece.

[0093] refer to Figure 4 In the second installation state, the first cutting edge 21 faces upward in the vertical direction and can process the reverse side of the workpiece; the second cutting edge 22 faces downward in the vertical direction and can process the front side of the workpiece.

[0094] It should be noted that in actual use, in the first installation state, the first cutting edge 21 can be positioned upwards to process the reverse side of the workpiece, and the second cutting edge 22 can be positioned downwards to process the front side of the workpiece. Correspondingly, in the second installation state, the first cutting edge 21 is positioned downwards to process the front side of the workpiece, and the second cutting edge 22 is positioned upwards to process the reverse side of the workpiece.

[0095] There are two ways to switch between the two installation states:

[0096] refer to Figure 1-5 One method is to achieve this by flipping the first blade 2. Obviously, the first blade 2 is detachably connected to the tool holder 13.

[0097] Specifically, the first blade 2 is positioned on the tool holder 1 by the first positioning mechanism 6, ensuring that the first cutting edge 21 and the second cutting edge 22 of the first blade 2 can be machined to produce a bevel angle of a preset specification.

[0098] refer to Figure 2 The first positioning mechanism 6 adopts a limiting groove 61, which is set on the inner wall of the notch groove 11 (the notch groove 11 is set on the tool holder 13), and at least one side of the limiting groove 61 extends outward from the tool holder 13.

[0099] The end of the first blade 2 that is inserted into the limiting groove 61 is the positioning end. In the first installation state, the end face of the positioning end that is close to the bottom surface of the limiting groove 61 (or in contact with the bottom surface of the limiting groove 61) is the first positioning surface 62, and the end face opposite to the first positioning surface 62 is the second positioning surface 63.

[0100] Specifically, in the first installation state, the first blade 2 is positioned by the first positioning surface 62 engaging with the bottom surface of the limiting groove 61 and by the outer wall of the positioning end engaging with the side wall of the limiting groove 61; in the second installation state, the first blade 2 is positioned by the second positioning surface 63 engaging with the bottom surface of the limiting groove 61 and by the outer wall of the positioning end engaging with the side wall of the limiting groove 61.

[0101] This method serves two purposes: firstly, it positions the first blade 2 to ensure that the first cutting edge 21 and the second cutting edge 22 can be machined to the appropriate bevel angle after installation; secondly, it also supports the first blade 2.

[0102] It should be noted that the first positioning mechanism 6 described above is only one type of structure for positioning the first blade 2. The first positioning mechanism 6 can also be implemented using other existing technologies.

[0103] It should be noted that the reference Figure 2 The bottom surface of the limiting groove 61 refers to the surface in the figure where the connecting hole 42 is provided. The bottom surface of the limiting groove 61 is generally a plane and is parallel to the vertical direction.

[0104] refer to Figure 1-5 The first blade 2 is fixed in the limiting groove 61 of the tool holder 1 by the first connecting mechanism 4. The first connecting mechanism 4 includes a fastener 41, which clamps the first blade 2 in the limiting groove 61 of the tool holder 13.

[0105] Specifically, the fastener 41 is a countersunk screw, and the first blade 2 has a through hole 43 in the middle. Both sides of the through hole 43 are provided with bevels that match the countersunk screw. The screw part of the countersunk screw passes through the through hole 43 and is threadedly connected to the connecting hole 42 on the bottom surface of the limiting groove 61. The head of the countersunk screw is restricted from passing through the through hole 43. The first blade 2 is clamped and fixed in the limiting groove 61 by rotating the countersunk screw.

[0106] It should be noted that countersunk screws have significant advantages over other screws or bolts. First, the contact area between the head of the countersunk screw and the first cutting tool 2 is larger. Second, the contact surface between the head of the countersunk screw and the through hole 4323 is a conical surface, which can limit the first cutting tool 2 through their cooperation. Third, after the countersunk screw is installed, there is no protruding structure on the surface, and it will not exceed the installation reference surface. If ordinary bolts are used, their bolt heads will protrude from the installation surface, which can easily cause motion interference and affect the accuracy of the reference surface fit and the accuracy of tool rotation.

[0107] It should be noted that the connecting hole 42 can also be a through hole. The screw part of the countersunk screw passes through the through hole 43 and the connecting hole 42 in sequence and is threaded to the nut. The first blade 2 is clamped and fixed on the tool holder 13 by the nut and the countersunk screw.

[0108] It should be noted that the first connecting mechanism 4 can also be implemented in other ways, for example, by using an upper pressure plate.

[0109] As a further solution, an anti-rotation structure is provided between the limiting groove 61 and the positioning end of the first blade 2.

[0110] Specifically, the first positioning surface 62 or the second positioning surface 63 of the first blade 2 and the bottom surface of the limiting groove 61 form a pair of anti-rotation planar pairs. The normal direction of the planar pairs forms an angle with the force direction of the first blade 2 to resist the circumferential cutting torque.

[0111] It should be noted that the anti-rotation structure can also be a miniature keyway or positioning pin hole (not shown in the figure) set between the first blade 2 and the limiting groove 61. By setting the anti-rotation structure, the first blade 2 can be prevented from rotating, providing anti-torsion capability for the first blade 2, thereby ensuring that the chamfer processed by the first cutting edge 21 and the second cutting edge 22 is the same as the preset chamfer type and has the same specifications.

[0112] It should be noted that, in order to ensure the positioning accuracy and consistency of repeatable positioning before and after the first blade 2 is rotated 180°, a high positioning accuracy needs to be set. For example, the perpendicularity tolerance between the bottom surface and the side wall of the limiting groove 61 and the parallelism tolerance between the first positioning surface 62 and the second positioning surface 63 should be controlled within ±0.005mm.

[0113] Another way to achieve installation state switching is to install the tool holder 13 on the mounting rod 12 in a detachable connection manner, and switch the installation state by flipping the tool holder 13.

[0114] In this design, the first blade 2 and the tool holder 13 can be permanently connected or detachably connected. The detachable connection between the first blade 2 and the tool holder 13 can be achieved using the methods described above; the permanent connection between the first blade 2 and the tool holder 13 can be achieved by welding.

[0115] It should be noted that the tool holder 13 and the mounting rod 12 can be detachably connected in ways including threaded connection, snap-fit, etc., and can also adopt the connection and positioning method of the tool holder 3 and the tool rod 1 in Embodiment 2 (see reference). Figure 8 ).

[0116] As a further option, the first blade 2 is positioned within the same limiting groove 61 in both the first and second installation states.

[0117] It should be noted that, in order to achieve this solution, the positioning end of the first blade 2 and the limiting groove 61 both adopt a mirror symmetry structure. The limiting groove 61 should have a symmetry plane in the horizontal direction (this symmetry plane is parallel to the horizontal plane and passes through the center line of the limiting groove 61); the positioning end of the first blade 2 has a symmetry plane in both the horizontal and vertical directions, so as to ensure that after the first blade 2 is rotated 180 degrees, the bevel angle specifications processed by the first cutting edge 21 and the second cutting edge 22 are the same.

[0118] It should be noted that while using two or more limiting grooves 61 can reduce the requirements for the positioning end of the first blade 2, it will increase the machining cost of the tool holder 1. In addition, in order to ensure that the bevel angle specifications of the first blade 21 and the second blade 22 are the same in both installation states, using multiple limiting grooves 61 requires higher machining accuracy.

[0119] As a further option, refer to Figure 6Both the first cutting edge 21 and the second cutting edge 22 are double-edged. Specifically, taking the first cutting edge 21 as an example, there are two first cutting edges 21, and the two first cutting edges 21 are symmetrically arranged. The two first cutting edges 21 are symmetrically distributed on the left and right sides along the center line of the first blade 2, and the geometric parameters of the two first cutting edges 21 are the same.

[0120] When the machine tool spindle rotates clockwise, one of the first cutting edges 21 participates in the chamfering process; when the machine tool spindle rotates counterclockwise, the other symmetrical first cutting edge 21 participates in the chamfering process. Through this symmetrical double-edged design, effective cutting action can be achieved regardless of whether the spindle rotates clockwise or counterclockwise. Therefore, after switching the installation state of the first cutting edge 21, there is no need to adjust the spindle rotation direction, making it suitable for equipment with a fixed spindle rotation direction, such as three-axis machine tools.

[0121] The advantage of this method is that it allows for direct machining without changing the spindle rotation direction after the installation state is switched. It is especially suitable for three-axis machine tools with a fixed spindle rotation direction, avoiding program modifications and machine tool limitations caused by spindle reversal due to flipping. This is one of the important technical contributions of this invention compared to single-edged positive and negative chamfering tools.

[0122] It should be noted that the first cutting edge 21 and the second cutting edge 22 are single-edged. After the first blade 2 switches the installation state, the rotation direction of the spindle needs to be changed. Therefore, it is not suitable for three-axis machine tools (the spindle rotation direction of a three-axis machine tool is fixed).

[0123] As a further option, multiple first blades 2 are provided on the outer wall of the tool holder 13.

[0124] It should be noted that, in using this method, multiple first blades 2 must be evenly distributed circumferentially, the first blade 21 and the second blade 22 must have the same radius of rotation, and the rotational runout must meet the accuracy requirements; the first blade 21 and the second blade 22 of multiple first blades 2 must have the same blade shape, the same geometric parameters, and reliable positioning accuracy, etc.

[0125] This method can improve processing efficiency.

[0126] Working principle: (Reference) Figure 3 , Figure 4 Taking the flipping of the first blade 2 to switch the installation state as an example, the processing steps are as follows:

[0127] The first step is to install the first blade 2 onto the tool holder 13, so that the first blade 2 is in the first installation state;

[0128] The second step is to process the bevel on the front side of the workpiece using the first cutting edge 21;

[0129] The third step is to process the bevel on the reverse side of the workpiece using the second cutting edge 22;

[0130] Fourth step, remove the first blade 2, and rotate the first blade 2 180 degrees upward or downward, and then install the first blade 2 on the tool holder 13 to complete the switch from the first installation state to the second installation state;

[0131] Fifth step: Machin the bevel on the reverse side of the workpiece using the first cutting edge 21;

[0132] Step 6: Use the second cutting edge 22 to machine the bevel on the front of the workpiece.

[0133] Using this method, for the problem of needing to process chamfers of different types or specifications on both sides of the wheel hub, the solution in this embodiment only requires one installation and removal of the first cutting tool 2 or the tool holder 13 to complete the processing. In contrast, using existing chamfering tools for both sides requires changing the cutting tool twice to complete the processing. Compared to this solution, each wheel hub needs to be processed with one more cutting tool. In mass production, the time saved will accumulate and bring about a significant improvement in production efficiency.

[0134] Example 2

[0135] refer to Figure 7-9 This embodiment provides a solution different from Embodiment 1. The tool in this embodiment includes a tool holder 1. The upper end of the tool holder 1 is the mounting end, which is connected and fixed to the spindle of the machine tool, so that the rotation of the machine tool spindle can drive the tool holder 1 to rotate around its own axis. The lower end of the tool holder 1 is the cutting end. A tool holder 3 is detachably connected to the cutting end of the tool holder 1. A second blade 8 and a third blade 9 are provided on the tool holder 3. The two blades (i.e., the second blade 8 and the third blade 9) are arranged at intervals in the vertical direction. The second blade 8 is provided with a first cutting edge 81, and the third blade 9 is provided with a second cutting edge 91. The first cutting edge 81 and the second cutting edge 91 are far apart from each other.

[0136] It should be noted that the connection method between the second blade 8 and the third blade 9 and the tool holder 3 is not limited; it can be a detachable connection or a permanent connection. The detachable connection method between the two blades (i.e., the second blade 8 and the third blade 9) and the tool holder 3 can refer to the detachable connection method between the first blade 2 and the tool holder 13 in Embodiment 1; the permanent connection method between the two blades and the tool holder 3 can be welding.

[0137] It should be noted that the reference Figure 7 Taking the second blade 8 as the top and the third blade 9 as the bottom as an example, the first cutting edge 81 and the second cutting edge 91 being far apart (opposite to each other) means that the first cutting edge 81 faces upward and the second cutting edge 91 faces downward. When the second blade 8 is located at the bottom and the third blade 9 is located at the top, it means that the first cutting edge 81 faces downward and the second cutting edge 91 faces upward.

[0138] It should be noted that in this solution, the chamfer types machined by the first cutting edge 81 and the second cutting edge 91 may be different, or the same type but different specifications. Specifically, this can be divided into the following cases: The first case (not shown in the figure): one of the first cutting edge 81 and the second cutting edge 91 is machined with a fillet, while the other is machined with a bevel. The second case (not shown in the figure): both the first cutting edge 81 and the second cutting edge 91 are machined with fillets, but the specifications of the fillets are not the same. (See reference...) Figure 7 The third case is that both the first cutting edge 81 and the second cutting edge 91 are machined with bevels, but the specifications of the bevels are not the same.

[0139] It should be noted that, for ease of description, the following embodiments will be illustrated by taking the example that both the first cutting edge 81 and the second cutting edge 91 are machined with bevels.

[0140] In this embodiment, the tool holder 3 and the tool shank 1 are detachably connected, and the tool holder 3 and the tool shank 1 have two assembly states, as shown in the reference. Figure 7 ,in:

[0141] In the first assembly state, the first cutting edge 81 faces downward in the vertical direction and can process the front side of the workpiece; the second cutting edge 91 faces upward in the vertical direction and can process the back side of the workpiece.

[0142] In the second assembly state, the first cutting edge 81 faces upward in the vertical direction and can process the reverse side of the workpiece; the second cutting edge 91 faces downward in the vertical direction and can process the front side of the workpiece.

[0143] It should be noted that in actual use, in the first assembly state, the first cutting edge 81 can be positioned upwards to machine the reverse side of the workpiece, and the second cutting edge 91 downwards to machine the front side of the workpiece. Correspondingly, in the second assembly state, the first cutting edge 81 is positioned downwards to machine the front side of the workpiece, and the second cutting edge 91 is positioned upwards to machine the reverse side of the workpiece.

[0144] It should be noted that the first cutting edge 81 and the second cutting edge 91 have different bevel specifications (meaning the bevel angles are different, or the bevel angles are the same but the chamfer circumferential lengths are different); the first cutting edge 81 has the same bevel specifications in both the first and second assembly states (meaning both the bevel angle and the chamfer circumferential length are the same), and the second cutting edge 91 has the same bevel specifications in both the first and second assembly states.

[0145] Among them, reference Figure 8 The tool holder 3 is connected and fixed to the tool bar 1 through the second connecting mechanism 5.

[0146] Specifically, in this embodiment, the second connecting mechanism 5 includes a connecting rod 51, a connecting hole 52, and a limiting member 53.

[0147] The connecting rod 51 is located on the lower end face of the tool holder 1, and the connecting hole 52 passes through the upper and lower ends of the tool holder 3. During assembly, the connecting hole 52 is inserted into the connecting rod 51, and then the limiting member 53 is connected to the connecting rod 51. The tool holder 3 is clamped and fixed by the limiting member 53 and the tool holder 1.

[0148] It should be noted that the limiting member 53 and the connecting rod 51 can be fixed by wedge fixing or threaded connection, with threaded connection being preferred.

[0149] It should be noted that the connecting rod 51 can also be set in the tool holder 3 (not shown in the figure). When the connecting rod 51 is set in the tool holder 3, it needs to extend out of the upper and lower ends of the tool holder 3. Correspondingly, the connecting hole 52 is set on the lower end face of the cutting end of the tool bar 1, and a through groove communicating with the connecting hole 52 is opened in the middle of the tool bar 1. After the connecting rod 51 passes through the connecting hole 52 and enters the through groove, it is connected with the limiting member 53 in the through groove to realize the connection and fixation of the tool bar 1 and the tool holder 3.

[0150] Among them, reference Figure 8 The tool holder 3 limits the relative position of the tool holder 3 and the tool holder 1 through the second positioning mechanism 7, so as to ensure that after the tool holder 3 and the tool holder 1 are assembled, the first cutting edge 81 and the second cutting edge 91 can process the preset chamfer.

[0151] refer to Figure 8 The second positioning mechanism 7 includes a first positioning element 71 and a second positioning element 72. The first positioning element 71 is disposed on the tool holder 1 and / or the limiting element 53, and the second positioning element 72 is disposed on both the upper and lower end surfaces of the tool holder 3. During assembly, the first positioning element 71 and the corresponding second positioning element 72 are fitted together to fix their relative positions, ensuring that the oblique angle of the first cutting edge 81 and the second cutting edge 91 is a preset angle.

[0152] Specifically, taking the first positioning member 71 set on the lower end face of the cutting end of the tool holder 1 as an example (not shown in the figure), in the first assembly state, the second positioning member 72 on the upper end face of the tool holder 3 is connected to the first positioning member 71. At this time, the third blade 9 is located above the second blade 8. The tool holder 3 is flipped over, and the second positioning member 72 on the lower end face of the tool holder 3 is connected to the first positioning member 71, so that the tool holder 3 is switched to the second assembly state. At this time, the third blade 9 is located below the second blade 8.

[0153] It should be noted that one of the first positioning member 71 and the second positioning member 72 adopts a protruding structure, while the other adopts a recessed structure.

[0154] As a further option, refer to Figure 8 One of the first positioning element 71 and the second positioning element 72 is a positioning pin, and the other is a positioning hole. During assembly, the positioning pin is inserted into the positioning hole to achieve positioning.

[0155] It should be noted that the positioning pins and positioning holes that cooperate with each other form a set, and one or more sets of positioning pins and positioning holes can be set.

[0156] It should be noted that the reference Figure 8 One of the positioning hole and the positioning pin is provided in the tool holder 3, and the other is provided in the tool bar 1 and / or the limiting member 53.

[0157] As a further solution, both the positioning holes and the positioning posts adopt a shape with successively decreasing cross-sectional shape, and the two can form surface contact when assembled.

[0158] This method enables bidirectional synchronous positioning in both the axial and radial directions through the action of inclined or conical surfaces. In addition, it also serves as a guide, automatically correcting positional deviations during part loading, making insertion easy and assembly simple. Furthermore, it boasts the advantage of high positioning repeatability.

[0159] It should be noted that when using a structure with progressively decreasing cross-sectional shapes, the center lines of the positioning holes and the positioning posts are both set in the vertical direction.

[0160] As a further solution, both the positioning hole and the positioning post are conical, with the same taper. The conical surfaces of the positioning hole and the positioning post fit together to ensure that the tool holder 3 and the tool shank 1 are coaxial.

[0161] Using this method, the entire cone wall is in contact with the cone surface over a large area, and the clamping force is evenly distributed along the circumference of the cone surface. The pressure per unit area is low, making it less likely to cause crushing or deformation.

[0162] As a further solution, taking the positioning hole set in the tool holder 3 and the positioning pin set in the limiting member 53 as an example, the positioning hole and the connecting hole 42 are set coaxially, and the positioning pin and the limiting member 53 are set coaxially.

[0163] This method, due to the symmetrical shape of the conical structure, provides excellent dynamic balance during rotation, making it suitable for high-speed rotation conditions. Furthermore, it results in low vibration and low noise during high-speed rotation.

[0164] As a further option, refer to Figure 8 The tool holder 3 and the tool shank 1 are set coaxially.

[0165] It should be noted that the tool holder 3 and the tool shank 1 can also be set eccentrically, that is, the axis of the tool holder 3 is parallel to the axis of the tool shank 1, and the two axes are separated by a distance. This method can increase the applicability of the machine tool.

[0166] As a further option, both the first cutting edge 81 and the second cutting edge 91 are double-edged. With this method, there is no need to limit the spindle rotation direction during the machining of bevels.

[0167] It should be noted that the double-edged structure of the first cutting edge 81 and the second cutting edge 91 can refer to the structure of the first cutting edge 21 and the second cutting edge 22 in Embodiment 1.

[0168] It should be noted that when the first cutting edge 81 and the second cutting edge 91 are single-edged, the rotation direction of the spindle needs to be changed after the tool holder 3 switches the assembly state. This is not applicable to three-axis machine tools (the spindle rotation direction of a three-axis machine tool is fixed).

[0169] As a further option, a second blade 8 and a third blade 9 are set as a group, and multiple groups of second blades 8 and third blades 9 are set on the outer wall of the tool holder 3.

[0170] It should be noted that, in adopting this method, it is necessary to ensure that multiple second blades 8 are evenly distributed circumferentially, that the radii of rotation of the second cutting edges 22 are consistent, and that the rotational runout meets the accuracy requirements; that the first cutting edges 81 of the multiple second blades 8 have consistent cutting edge shapes, consistent geometric parameters, and reliable positioning accuracy, etc.; it is also necessary to ensure that multiple third blades 9 are evenly distributed circumferentially, that the radii of rotation of the third blades 9 are consistent, and that the rotational runout meets the accuracy requirements; that the second cutting edges 91 of the multiple third blades 9 have consistent cutting edge shapes, consistent geometric parameters, and reliable positioning accuracy, etc.

[0171] This method can improve processing efficiency.

[0172] Working principle: (Reference) Figure 7 The processing steps in this embodiment are as follows:

[0173] First, install the tool holder 3 and put it in the first assembly state;

[0174] The second step is to machine the bevel on the front side of the workpiece using the first cutting edge 81;

[0175] The third step is to machine the bevel on the reverse side of the workpiece using the second cutting edge 91;

[0176] The fourth step is to disassemble the tool holder 3 from the tool shank 1, then rotate the tool holder 3 180 degrees upwards or downwards, and then install the tool holder 3 on the cutting end of the tool shank 1 to complete the switch from the first assembly state to the second assembly state.

[0177] Fifth step: Machin the bevel on the reverse side of the workpiece using the first cutting edge 81;

[0178] The sixth step is to machine the bevel on the front side of the workpiece using the second cutting edge 91.

[0179] This method addresses the issue of needing to process chamfers of different types or specifications on both sides of the wheel hub. The solution in this embodiment only requires one installation and removal of the tool holder 3 to complete the process. In contrast, existing chamfering tools for both sides require changing the inserts twice, meaning an extra insert change is needed for each wheel hub processed. In mass production, the accumulated time savings will significantly improve production efficiency.

[0180] It should be noted that in the two embodiments above, the specifications of the fillet refer to the radius of the fillet arc, which is usually in millimeters (mm), such as R1.5, R2.0, R2.5, etc.

[0181] It should be noted that in the two embodiments above, the specification of the chamfer angle refers to the size of the cutting bevel, and the unit is usually millimeters (mm), such as: C1, C1.5, C2, 30°×2, 60°×1.5, etc.

[0182] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chamfering tool for both sides of an automobile wheel hub, characterized in that, include: The tool holder (1) includes a mounting rod (12) and a tool holder (13) that are connected to each other. The first blade (2) is mounted on the blade holder (13) and has a first cutting edge (21) and a second cutting edge (22). The first blade (2) has at least two mounting states at the tool holder (1), wherein: In the first installation state, the first cutting edge (21) is used for chamfering the front side, and the second cutting edge (22) is used for chamfering the back side; In the second installation state, the first cutting edge (21) is used for chamfering the reverse side, and the second cutting edge (22) is used for chamfering the front side; The chamfer types processed by the first cutting edge (21) and the second cutting edge (22) are different, or the chamfer types processed by the first cutting edge (21) and the second cutting edge (22) are the same but different in specifications; The chamfer type and specifications processed by the first cutting edge (21) in the first installation state and the second installation state are the same; the chamfer type and specifications processed by the second cutting edge (22) in the first installation state and the second installation state are the same. Switching between the first and second installation states is achieved by flipping the device.

2. The cutting tool according to claim 1, characterized in that, One of the first cutting edge (21) and the second cutting edge (22) is machined with a bevel, and the other is machined with a rounded corner; Alternatively, both the first cutting edge (21) and the second cutting edge (22) are machined with rounded corners, and the specifications of the rounded corners are different. Alternatively, both the first cutting edge (21) and the second cutting edge (22) are machined with bevels, and the specifications of the bevels are different.

3. The cutting tool according to claim 1 or 2, characterized in that, The first blade (2) is detachably connected to the tool holder (13), and can be switched between a first installation state and a second installation state by flipping the first blade (2).

4. The cutting tool according to claim 3, characterized in that, Also includes: In the first installation state or the second installation state, the first connecting mechanism (4) connects and fixes the first blade (2) to the tool holder (13); In either the first or second installation state, the first positioning mechanism (6) is used to define the position of the first blade (2) relative to the tool holder (13).

5. The cutting tool according to claim 1 or 2, characterized in that, The tool holder (13) is detachably connected to the mounting rod (12), and can be switched between a first mounting state and a second mounting state by flipping the tool holder (13).

6. A chamfering tool for both sides of an automobile wheel hub, characterized in that, include: The tool holder (1) has a mounting end and a cutting end at its two ends, respectively. Tool holder (3), which is mounted on the cutting end of tool holder (1); The second blade (8) and the third blade (9) are mounted on the tool holder (3). The second blade (8) has a first cutting edge (81) and the third blade (9) has a second cutting edge (91). The second blade (8) and the third blade (9) are mounted on the tool holder (3). The second blade (8) and the third blade (9) are arranged sequentially along the axis of the tool holder (3). The first cutting edge (81) and the second cutting edge (91) are arranged opposite to each other. The tool holder (3) has at least two assembly states at the tool holder (1), wherein: In the first assembled state, the first cutting edge (81) is used for front chamfering, and the second cutting edge (91) is used for back chamfering; In the second assembly state, the first cutting edge (81) is used for chamfering the reverse side, and the second cutting edge (91) is used for chamfering the front side; The chamfer types processed by the first cutting edge (81) and the second cutting edge (91) are different, or the chamfer types processed by the first cutting edge (81) and the second cutting edge (91) are the same but different in specifications; The chamfer type and specifications of the first cutting edge (81) are the same in the first assembly state or the second assembly state, and the chamfer type and specifications of the second cutting edge (91) are the same in the first assembly state or the second assembly state. The tool holder (3) switches between the first assembly state and the second assembly state by flipping.

7. The cutting tool according to claim 6, characterized in that, One of the first cutting edge (81) and the second cutting edge (91) is machined with a bevel angle, and the other is machined with a fillet angle; Alternatively, both the first cutting edge (81) and the second cutting edge (91) are machined with fillets, and the fillet specifications of the two are different; Alternatively, both the first cutting edge (81) and the second cutting edge (91) are machined with bevels, and the bevel specifications of the two are different.

8. The cutting tool according to claim 6 or 7, characterized in that, Also includes: In the first or second assembly state, the second connecting mechanism (5) connects and fixes the tool holder (3) and the tool bar (1). The second positioning mechanism (7) is used to define the position of the tool holder (3) relative to the tool bar (1) in either the first or second assembly state.

9. The cutting tool according to claim 8, characterized in that, The second connecting mechanism (5) includes: Connecting rod (51) is fixedly mounted on the cutting end of the tool holder (1), and the connecting rod (51) is coaxial with the tool holder (1); The connecting hole (52) passes through the tool holder (3), and the connecting rod (51) and the connecting hole (52) are in clearance fit; The limiting member (53) is detachably connected to the connecting rod (51); The tool holder (3) is connected to the tool holder (1) via a limiting member (53) and a connecting rod (51).

10. The cutting tool according to claim 9, characterized in that, The second positioning mechanism (7) includes: The first positioning element (71) is disposed on the tool holder (1) and / or the limiting element (53). The second positioning element (72) is provided at both ends of the tool holder (3); The second positioning element (72) engages with the first positioning element (71) to define the position of the tool holder (3) relative to the tool holder (1).

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