Rolling device for improving surface hardness of hub

Abstract

The utility model relates to the technical field of hub manufacturing, and discloses a rolling device for improving the surface hardness of a hub, which comprises a chuck for clamping the hub to be processed, a rolling mechanism is arranged corresponding to the chuck, the rolling mechanism comprises a roller for rolling the flange end face of the hub to be processed, the roller is rotatably connected with a tool apron, and the tool apron is rotatably connected with the chuck. The tool apron can achieve radial feeding relative to the chuck so as to drive the roller to conduct rolling operation on the hub to be machined clamped on the chuck. By arranging the rolling mechanism, the rolling wheel is pressed on the end face of the rotating hub flange in a rolling mode and generates rolling pressure on the end face of the hub, so that the purposes of improving the surface structure of the hub and improving the surface hardness and strength of the hub are achieved, and the problem that the end face of the hub flange is prone to cracks is solved. According to the utility model, the hardness of the end face of the hub flange can be improved by more than 10HB.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel hub manufacturing, in particular to a rolling device for improving the surface hardness of a wheel hub. Background Art

[0002] With the development of the aluminum alloy wheel industry, major car companies have gradually adopted aluminum alloy wheels to replace steel wheels. Among them, due to the large load, the performance and strength requirements of the wheel hub are relatively high. During the development and testing stage of the wheel hub, due to insufficient strength, cracks are prone to appear on the flange end face during the impact test. This kind of crack is not allowed to occur. Therefore, how to solve the problem of cracks on the wheel hub surface, especially the flange end face, in order to pass the strength test is an urgent problem that needs to be overcome. Traditional aluminum alloy wheel processing methods mostly use lathe cutting. After the wheel hub is turned, the surface stress cannot be fully released, and the surface hardness and strength need to be further improved.

[0003] Based on this, developing a device to improve the surface hardness of the wheel hub and applying it to actual wheel hub production is an issue that needs to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to provide a rolling device for improving the surface hardness of the hub in order to solve the problems of insufficient surface hardness and strength of the existing hub and the problem of surface cracks easily appearing on the flange end face during strength testing.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A rolling device for improving the surface hardness of a wheel hub comprises a chuck for clamping the wheel hub to be processed, a rolling mechanism is arranged corresponding to the chuck, the rolling mechanism comprises a roller for rolling the flange end face of the wheel hub to be processed, the roller is rotatably connected to a tool holder, and the tool holder can realize radial feeding relative to the chuck to drive the roller to roll the wheel hub to be processed clamped on the chuck.

[0007] Preferably, the rolling mechanism includes a wheel frame for supporting a roller, the roller is rotatably connected to the wheel frame via a wheel axle, a rolling bearing is mounted on the roller, and the wheel axle passes through the wheel frame and the rolling bearing to fix the roller on the wheel frame.

[0008] Preferably, the rolling bearing is interference fit with the roller, and the wheel axle is interference fit with the rolling bearing.

[0009] Preferably, the front end of the wheel axle is provided with a notch for accommodating a fixing gasket, a fastening hole is provided on the fixing gasket, one end of the fixing plate is inserted into the notch, and the other end passes through the fastening hole and is locked on the wheel frame by a fastening bolt.

[0010] Preferably, the wheel frame is fixedly connected to the tool holder at a certain angle a.

[0011] Preferably, the angle a is 150-170°.

[0012] Preferably, the chuck comprises a positioning mandrel arranged corresponding to the center hole of the wheel hub, and the positioning mandrel cooperates with the axial hole of the center hole of the wheel hub.

[0013] Preferably, the positioning mandrel is a stepped shaft structure provided with a stopper, the stopper is arranged corresponding to the inner end surface of the center hole of the hub, and the diameter of the stopper is larger than the aperture of the center hole.

[0014] Preferably, the chuck is connected to a machine tool spindle to obtain the rotational power of the wheel hub to be processed, and the rolling mechanism is connected to a lathe turret.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides a rolling mechanism to perform rolling operation on the wheel hub surface after the turning process, so that the roller rolls and presses on the rotating wheel hub flange end face and generates rolling pressure on the wheel hub end face, so as to achieve the purpose of improving the surface structure of the wheel hub and improving the hardness and strength of the wheel hub surface. The problem that the wheel hub flange end face is prone to cracks is solved. Through the application of the utility model, the hardness of the wheel hub flange end face can be increased by more than 10HB. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of the middle roller pressing mechanism.

[0020] In the figure: 1--chuck; 11--positioning mandrel; 12--stop; 2--rolling mechanism; 21--roller; 22--knife holder; 23--wheel frame; 24--wheel axle; 25--rolling bearing; 26--fixing gasket; 27--notch. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] like Figure 1-2As shown, a rolling device for improving the surface hardness of a wheel hub comprises a chuck 1 for clamping a wheel hub to be processed, and a rolling mechanism 2 is arranged corresponding to the chuck 1, and the rolling mechanism 2 has axial and radial degrees of freedom relative to the chuck 1. The rolling mechanism 2 comprises a roller 21 for rolling the wheel hub to be processed to improve the hardness of the end face of the wheel hub flange, and the roller 21 is rotatably connected to a tool holder 22, and the tool holder 22 can realize radial feeding relative to the chuck 1, thereby driving the roller 21 to roll the wheel hub to be processed clamped on the chuck 1.

[0023] When in use, the wheel hub to be processed off the turning line is clamped on the chuck 1, and the chuck 1 is connected to the power device to obtain rotational power and drive the wheel hub to rotate synchronously. The rolling mechanism 2 is adjusted so that the roller 21 is close to the end face of the flange of the wheel hub to be processed to complete the tool setting operation. The tool holder 22 drives the roller 21 to radially feed relative to the end face of the hub flange. The roller 21 rolls and presses on the end face of the hub flange and generates rolling pressure on the end face of the hub, so as to improve the surface structure of the hub and enhance the hardness and strength of the hub surface. The roller 21 is driven by the radial feed of the tool holder 22 to complete the rolling operation of the entire hub flange end face. The tool holder 22 can achieve axial and radial displacement relative to the wheel hub to be processed through the XY axis translation mechanism in the prior art, which will not be repeated here.

[0024] As a preferred embodiment, the outer diameter of the roller 21 is provided with a fillet structure, and the fillet radius is 4-8mm. The material of the roller 21 is die steel with a hardness of 55-60HRC to ensure the wear resistance of the roller 21 and improve the service life of the roller 21. During rolling, the rotation speed of the chuck 1 is preferably 80-200r / min, and the feed rate of the roller 21 is preferably 0.05-0.15mm / r, that is, the roller 21 feeds 0.05-0.15mm for each rotation of the hub driven by the chuck 1. In this embodiment, after the roller 21 contacts the end face of the hub flange, the rolling mechanism 2 will continue to translate axially toward the hub by 0.03-0.08mm to form a rolling pressure of the roller 21 on the end face of the hub flange.

[0025] As a preferred embodiment, Figure 2 As shown, the rolling mechanism 2 includes a wheel frame 23 for supporting a roller 21, and the roller 21 is rotatably connected to the wheel frame 23 through a wheel axle 24. Specifically, a rolling bearing 25 is mounted on the roller 21, and the wheel axle 24 passes through the wheel frame 23 and the rolling bearing 25 to fix the roller 21 on the wheel frame 23. Preferably, the rolling bearing 25 and the roller 21 are interference fitted, and the wheel axle and the rolling bearing 25 are interference fitted to improve the rotation stability of the roller 21 and ensure the rolling accuracy.

[0026] Preferably, a notch 27 for accommodating a fixing gasket 26 is opened at the front end of the wheel axle 24, and a fastening hole is opened on the fixing gasket 26. One end of the fixing plate is inserted into the notch 27, and the other end is penetrated through the fastening hole and locked on the wheel frame 23 by a fastening bolt, which effectively avoids the risk of the hub shaft loosening and improves the assembly stability of the wheel axle 24.

[0027] As a preferred embodiment, the wheel frame 23 is fixedly connected to the knife seat 22 at a certain angle a, so that the roller 21 contacts the end face of the hub flange to be processed at a certain inclination angle to perform rolling operation, which can optimize the structural stress of the rolling mechanism 2. At the same time, the roller set at a certain inclination angle can perform rolling operation on non-planar parts other than the end face of the hub flange, thereby improving the applicability of the device. Preferably, the angle a is preferably 150-170°.

[0028] In a further embodiment, Figure 1 As shown, the chuck 1 includes a positioning mandrel 11 arranged corresponding to the center hole of the wheel hub. The positioning mandrel 11 cooperates with the axial hole of the center hole of the wheel hub to improve the positioning accuracy of the wheel hub to be processed. In order to avoid the positioning mandrel 11 interfering with the feed path of the roller 21, the height of the positioning mandrel 11 is lower than the outer end surface of the center hole of the wheel hub. When in use, the end of the positioning mandrel 11 lies in the center hole of the wheel hub, which plays a role in positioning the wheel hub and effectively avoids interfering with the feed path of the roller 21.

[0029] Furthermore, the positioning mandrel 11 is a stepped shaft structure provided with a stop 12, the stop 12 is provided corresponding to the inner end face of the hub center hole, the diameter of the stop 12 is larger than the diameter of the center hole, and is used to support the inner end face of the hub flange. When in use, the stop 12 is against the inner end face of the hub center hole, and during the rolling operation, the stop 12 can support the flange end face of the hub, alleviate the problem of compression deformation of the hub flange end face, and further ensure the rolling processing accuracy.

[0030] As a preferred embodiment, the utility model can be modified based on an existing lathe, wherein the chuck 1 is connected to the machine tool spindle to obtain the rotational power of the wheel hub to be processed, and the rolling mechanism 2 is connected to the lathe turret, and the turret drives the roller 21 to achieve axial and radial displacement relative to the wheel hub to be processed, thereby completing the rolling operation of the wheel hub flange end face. Without modifying the overall structure of the lathe, the device can be conveniently manufactured, greatly reducing the device manufacturing cost and shortening the manufacturing cycle.

[0031] The above disclosure is only a specific embodiment of the present patent, but the present patent is not limited thereto. For ordinary technicians in this field, without departing from the principle of the present invention, the deformation made should be deemed to belong to the protection of the present invention.

Claims

1. A rolling device for improving the surface hardness of a hub, characterized in that: The invention comprises a chuck (1) for clamping a wheel hub to be processed, a rolling mechanism (2) being arranged corresponding to the chuck (1), the rolling mechanism (2) comprising a roller (21) for rolling the flange end face of the wheel hub to be processed, the roller (21) being rotatably connected to a tool holder (22), the tool holder (22) being capable of radial feeding relative to the chuck (1) so as to drive the roller (21) to perform a rolling operation on the wheel hub to be processed clamped on the chuck (1).

2. A rolling device for improving the surface hardness of a hub according to claim 1, characterized in that: The rolling mechanism (2) comprises a wheel frame (23) for supporting a roller (21); the roller (21) is rotatably connected to the wheel frame (23) via a wheel axle (24); a rolling bearing (25) is mounted on the roller (21); the wheel axle (24) passes through the wheel frame (23) and the rolling bearing (25) to fix the roller (21) on the wheel frame (23).

3. A rolling device for improving the surface hardness of a hub according to claim 2, characterized in that: The rolling bearing (25) and the roller (21) are interference fitted, and the wheel shaft (24) and the rolling bearing (25) are interference fitted.

4. A rolling device for improving the surface hardness of a hub according to claim 3, characterized in that: The front end of the wheel axle (24) is provided with a notch (27) for accommodating a fixing gasket (26), and the fixing gasket (26) is provided with a fastening hole. One end of the fixing gasket is inserted into the notch (27), and the other end is passed through the fastening hole by a fastening bolt and is locked on the wheel frame (23).

5. The rolling device for improving the surface hardness of a hub according to claim 2, characterized in that: The wheel frame (23) is fixedly connected to the knife seat (22) at a certain angle a.

6. A rolling device for improving the surface hardness of a hub according to claim 5, characterized in that: The angle a is 150-170°.

7. The rolling device for improving the surface hardness of a hub according to claim 1, characterized in that: The chuck (1) comprises a positioning mandrel (11) arranged corresponding to the central hole of the wheel hub, and the positioning mandrel (11) cooperates with the axial hole of the central hole of the wheel hub.

8. A rolling device for improving the surface hardness of a hub according to claim 7, characterized in that: The positioning mandrel (11) is a stepped shaft structure provided with a stop platform (12), the stop platform (12) is arranged corresponding to the inner end surface of the center hole of the wheel hub, and the diameter of the stop platform (12) is larger than the diameter of the center hole.

9. The rolling device for improving the surface hardness of a hub according to claim 1, characterized in that: The chuck (1) is connected to a machine tool spindle to obtain the rotational power of the wheel hub to be processed, and the rolling mechanism (2) is connected to a lathe turret.

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