A lathe for machining the outer circle of a wheel hub

Abstract

This utility model discloses a lathe for machining the outer diameter of a wheel hub, including a base, a spindle, a servo system, a cutting tool, and a closed-loop stepping system. The spindle is rotatably mounted on the base, and a pneumatic clamp is installed on the spindle. The pneumatic clamp is used to abut against the inner wall of the wheel hub to concentrically and stably stabilize the wheel hub on the spindle. The servo system is driven by the spindle, providing driving force for the spindle's rotation. The cutting tool is mounted on the base via a lead screw and cross slide, which enables the cutting tool to move axially and radially along the spindle. The closed-loop stepping system is driven by the lead screw and cross slide, providing driving force for the movement of the lead screw and cross slide. The lathe for machining the outer diameter of a wheel hub provided by this utility model effectively reduces the problems of feed rate fluctuation and unstable cutting force during the machining process of the outer diameter of the wheel hub, thereby effectively improving the machining accuracy and efficiency of the outer diameter of the wheel hub.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a lathe for machining the outer diameter of a wheel hub. Background Technology

[0002] In industries such as automobile manufacturing and machinery equipment, wheel hubs are key load-bearing and transmission components, and the machining accuracy of their outer diameter directly affects the operational stability, safety, and service life of the equipment. With the continuous improvement of modern industrial requirements for wheel hub performance, the market has raised the standards for the precision, efficiency, and automation of wheel hub outer diameter machining.

[0003] The machining of the outer diameter of wheel hubs mainly relies on relevant lathe equipment. The core requirements are to ensure the stable positioning of the wheel hub and the precise linkage control between the spindle and the cutting tool during the machining process. However, the existing lathe equipment is prone to problems such as feed rate fluctuations and unstable cutting forces during the machining process. This not only leads to a reduction in the machining accuracy of the outer diameter of the wheel hub, but also affects the machining efficiency.

[0004] Based on this, the present invention proposes a lathe for machining the outer diameter of a wheel hub to solve the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a lathe for machining the outer diameter of wheel hubs, thereby improving the machining accuracy and efficiency of the outer diameter of wheel hubs.

[0006] To solve the above-mentioned technical problems, this utility model provides a lathe for machining the outer diameter of a wheel hub, including a base, a spindle, a servo system, a cutting tool, and a closed-loop stepping system;

[0007] The main shaft is rotatably mounted on the base, and a pneumatic clamp is mounted on the main shaft. The pneumatic clamp is used to abut against the inner wall of the hub so that the hub is concentrically mounted on the main shaft.

[0008] The servo system is connected to the spindle drive and provides driving force for the spindle rotation;

[0009] The cutting tool is mounted on the base via a lead screw and cross slide, which is used to realize the axial and radial movement of the cutting tool along the spindle.

[0010] The closed-loop stepping system is connected to the lead screw and cross slide, providing driving force for the movement of the lead screw and cross slide.

[0011] Furthermore, the servo system includes a servo driver and a servo motor;

[0012] The servo driver is electrically connected to the servo motor.

[0013] The servo motor is fixed on the base and is connected to the main shaft drive.

[0014] Furthermore, the lead screw cross slide includes a Z-axis lead screw, an X-axis lead screw, a Z-axis drive seat, and an X-axis drive seat;

[0015] The Z-axis lead screw is rotatably mounted on the base along the axis of the main shaft.

[0016] The Z-axis drive seat is slidably mounted on the base and is threadedly connected to the Z-axis lead screw;

[0017] The X-axis lead screw and the Z-axis lead screw are perpendicularly intersecting each other, and the X-axis lead screw is rotatably mounted on the Z-axis drive seat;

[0018] The X-axis drive seat is slidably mounted on the Z-axis drive seat and is threadedly connected to the X-axis lead screw;

[0019] The cutting tool is mounted on the X-axis drive mount.

[0020] Furthermore, the closed-loop stepper system includes an X-axis closed-loop stepper motor and a Z-axis closed-loop stepper motor;

[0021] The X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are respectively fixed on the Z-axis drive seat and the base, and the X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are respectively connected to the X-axis lead screw and the Z-axis lead screw for transmission.

[0022] Both the X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are electrically connected to a closed-loop stepper driver.

[0023] Furthermore, the pneumatic clamp includes a pneumatic drive mechanism and a chuck seat;

[0024] The sidewall of the chuck seat is retractably equipped with multiple inner support heads, and the chuck seat is fixed to the end of the main shaft.

[0025] The pneumatic drive mechanism is mounted on the base and is used to drive multiple inner support heads to extend outward synchronously to abut against the inner sidewall of the wheel hub.

[0026] Furthermore, the chuck is detachably mounted on the spindle via a flange.

[0027] Furthermore, the pneumatic drive mechanism includes a pull rod, a drive base, and a cylinder;

[0028] The pull rod passes through the main shaft and is slidably disposed with the main shaft. One end of the pull rod is slidably connected to the chuck seat, and the other end of the pull rod is connected to the drive seat through a rotary bearing.

[0029] The drive seat is slidably mounted on the base along the axis of the main shaft;

[0030] The cylinder is fixed on the base, and the output end of the cylinder is connected to the drive seat;

[0031] When the cylinder output end extends, the pull rod, driven by the drive seat, causes the inner support head to extend outward.

[0032] Furthermore, the end of the pull rod near the chuck seat has a driving frustum, and each of the multiple inner support heads has a connecting inclined surface that cooperates with the driving frustum.

[0033] Furthermore, two rotary bearings are slidably mounted on the end of the pull rod away from the chuck seat. The two rotary bearings are threaded onto two fixing rings on the pull rod, which clamp a push-pull baffle. The push-pull baffle is fixedly connected to the drive seat.

[0034] Furthermore, the cutting tool is mounted on the lead screw cross slide via a quick-change tool holder.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] The lathe for machining the outer diameter of a wheel hub provided by this utility model uses a pneumatic clamp to abut against the inner wall of the wheel hub, so that the wheel hub is concentrically and stably fixed on the spindle. With the help of a servo system to drive the spindle to rotate and a closed-loop stepper system to drive the axial and radial feed of the cutting tool, the outer diameter turning of the wheel hub can be realized. The servo system can effectively ensure the high-speed and stable rotation of the spindle, and the closed-loop stepper system, based on its closed-loop control characteristics, can ensure the high-precision feed of the cutting tool, effectively reducing the problems of feed fluctuation and unstable cutting force during the machining of the outer diameter of the wheel hub, thereby effectively improving the machining accuracy and machining efficiency of the outer diameter of the wheel hub. Attached Figure Description

[0037] Figure 1 This is an exploded view of the overall structure of the lathe for machining the outer diameter of the wheel hub in this embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the installation of the inner support head in an embodiment of this utility model. Detailed Implementation

[0039] The lathe for machining the outer diameter of a wheel hub according to this invention will now be described in more detail with reference to the schematic diagrams, which illustrate preferred embodiments of this invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0040] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0041] like Figure 1 As shown in the figure, this utility model embodiment proposes a lathe for machining the outer diameter of a wheel hub, including a base 1, a spindle 2, a servo system, a cutting tool 3, and a closed-loop stepping system. The spindle 1 is rotatably mounted on the base 1 via a bearing seat with built-in bearings, and a pneumatic clamp 4 is mounted on the spindle 1. The pneumatic clamp is used to abut against the inner sidewall of the wheel hub to make the wheel hub concentrically mounted on the spindle 1. The servo motor system is driven by the spindle to provide driving force for the rotation of the spindle. The cutting tool 3 is mounted on the base 1 via a lead screw and cross slide 5. The lead screw and cross slide 5 is used to realize the axial and radial movement of the cutting tool 3 along the spindle 2. The closed-loop stepping system is driven by the lead screw and cross slide 5 to provide driving force for the movement of the lead screw and cross slide 5.

[0042] Specifically, the servo system includes a servo driver (not shown in the figure) and a servo motor 6; the servo driver is electrically connected to the servo motor 6; the servo motor 6 is fixed on the base 1 and is drivenly connected to the spindle 2.

[0043] Servo motor 6 can be connected to spindle 2 via transmission belt and pulley. Servo motor has the characteristics of high precision, fast response, wide speed range, stable output and strong adaptability. Using servo motor as the power source of spindle 2 ensures the stable high-speed rotation of spindle 2.

[0044] The lead screw cross slide 5 includes a Z-axis lead screw 51, an X-axis lead screw 52, ​​a Z-axis drive seat 53, and an X-axis drive seat 54. The Z-axis lead screw 51 is rotatably mounted on the base 1 along the axis of the spindle 2. The Z-axis drive seat 53 is slidably mounted on the base 1 and threadedly connected to the Z-axis lead screw 51. The X-axis lead screw 52 is perpendicularly distributed to the Z-axis lead screw 51 and is rotatably mounted on the Z-axis drive seat 53. The X-axis drive seat 54 is slidably mounted on the Z-axis drive seat 53 and threadedly connected to the X-axis lead screw 52. The cutting tool 3 is mounted on the X-axis drive seat 54.

[0045] The closed-loop stepper system includes an X-axis closed-loop stepper motor 7 and a Z-axis closed-loop stepper motor 8; the X-axis closed-loop stepper motor 7 and the Z-axis closed-loop stepper motor 8 are respectively fixed on the Z-axis drive seat 53 and the base 1, and the X-axis closed-loop stepper motor 7 and the Z-axis closed-loop stepper motor 8 are respectively connected to the X-axis lead screw 52 and the Z-axis lead screw 51; the X-axis closed-loop stepper motor 7 and the Z-axis closed-loop stepper motor 8 are each electrically connected to a closed-loop stepper driver (not shown in the figure).

[0046] The closed-loop stepper motor is equipped with an encoder to form a position feedback closed loop, which can monitor the actual rotation of the X-axis lead screw 52 and Z-axis lead screw 51 and the displacement status of the drive seat 53 in real time. When the stepper motor loses steps or deviates in displacement due to factors such as load fluctuations and mechanical backlash, the closed-loop stepper driver can immediately compare the commanded position with the actual position and correct the deviation through dynamic compensation pulse signals, so that the positioning accuracy of the X-axis and Z-axis is controlled within 0.002mm.

[0047] During machining, vibrations generated by the cutting tool and load variations caused by uneven wheel hub material can easily lead to fluctuations in the output torque of the stepper motor. The closed-loop system can quickly adjust the motor drive torque through real-time feedback, avoiding operational stalls caused by overload or underload. Meanwhile, for the transmission structure where the X and Z axes intersect perpendicularly, the independent feedback and coordinated control of the two-axis closed-loop stepper motors can reduce motion coupling interference, ensuring the smoothness of the cutting tool's movement during compound trajectory feed and reducing cutting texture errors.

[0048] In summary, the lathe for machining the outer diameter of the wheel hub provided in this embodiment uses a pneumatic clamp 4 to abut against the inner wall of the wheel hub, making the wheel hub concentrically and stably fixed on the spindle 2. With the servo system driving the spindle 2 to rotate and the closed-loop stepper system driving the cutting tool 3 to feed axially and radially, the outer diameter turning of the wheel hub can be realized. The servo system can effectively ensure the high-speed and stable rotation of the spindle, and the closed-loop stepper system, based on its closed-loop control characteristics, can ensure the high-precision feed of the cutting tool, effectively reducing the problems of feed fluctuation and unstable cutting force during the machining of the outer diameter of the wheel hub, thereby effectively improving the machining accuracy and machining efficiency of the outer diameter of the wheel hub.

[0049] In the above embodiment, the cutting tool 3 is mounted on the lead screw cross slide 5 via a quick-change tool holder 55. The quick-change tool holder 55 facilitates the rapid disassembly and replacement of the cutting tool 3.

[0050] In the above embodiments, the pneumatic clamp 4 includes a pneumatic drive mechanism and a chuck seat 41; referring to reference Figure 2The chuck seat 41 has multiple inner support heads 42 that can be telescopically installed on its side wall. The chuck seat 41 is fixed to the end of the main shaft 2. The pneumatic drive mechanism is installed on the base 1 and is used to drive the multiple inner support heads 42 to extend outward synchronously to abut against the inner side wall of the hub. By using the multiple inner support heads 42 to extend outward synchronously to abut against the inner side wall of the hub, a stable installation between the hub and the main shaft 2 is achieved, ensuring that the hub rotates stably with the main shaft 2. Moreover, the inner abutment type of stabilization will not interfere with the outer circle machining of the hub.

[0051] Specifically, the pneumatic drive mechanism includes a pull rod 44, a drive seat 45, and a cylinder 46; the pull rod 44 passes through the main shaft 2 and is slidably disposed with respect to the main shaft 2, one end of the pull rod 44 is slidably connected to the chuck seat 41, and the other end of the pull rod 44 is connected to the drive seat 45 through a rotating bearing 47; the drive seat 45 is slidably mounted on the base 1 along the axial direction of the main shaft 2; the cylinder 46 is fixed on the base 1, and the output end of the cylinder 46 is connected to the drive seat 45; when the output end of the cylinder 46 extends, the pull rod 44 drives the inner support head 42 to extend outward under the drive of the drive seat 45.

[0052] The pull rod 44 has a driving frustum 441 at one end near the chuck seat 41, and each of the multiple inner support heads 42 has a connecting inclined surface 421 that cooperates with the driving frustum 441.

[0053] When installing the wheel hub, the wheel hub is placed on the chuck seat 41. Then, the cylinder 46 is activated, which drives the pull rod 44 to move outward. When the pull rod 44 moves outward, multiple connecting inclined surfaces 421 simultaneously abut against the side wall of the driving frustum 441, driving multiple inner support heads 42 to move outward simultaneously to the chuck seat 41, thus achieving the synchronous extension of multiple inner support heads 42.

[0054] Furthermore, in order to achieve automatic retraction of the inner support head 42, an elastic element 410 is provided in the clamp seat 41 to connect the inner support head 42. During the process of the drive inclined block 411 and the connecting inclined surface 421 gradually separating, the elastic element 410 provides a pulling force to pull the inner support head 42 to move inward to the clamp seat 41, thereby achieving automatic retraction of the inner support head 42.

[0055] Preferably, the chuck 41 is detachably mounted on the spindle 2 via a flange 43. Through the standardized connection interface of the flange, quick switching of the chuck can be achieved without modifying the spindle structure, enabling the lathe to be compatible with the processing needs of various wheel hub specifications, significantly expanding the applicability of the equipment and reducing the cost for enterprises to purchase dedicated equipment for different products.

[0056] Furthermore, two rotary bearings 47 are slidably mounted on the end of the pull rod 44 away from the chuck seat 41. The two rotary bearings 47 are threaded onto two fixing rings 48 on the pull rod 44, which clamp a push-pull baffle 49. The push-pull baffle 49 is fixedly connected to the drive seat 45.

[0057] Specifically, the pull rod 44 has a threaded section, and two retaining rings 48 are located on opposite sides of the two rotating bearings 47. A push-pull baffle 49 is placed between the two rotating bearings 47. By tightening the two retaining rings 48, the two rotating bearings 47 clamp the push-pull baffle 49, thus connecting the drive seat 45 and the pull rod 44. By adjusting the position of the retaining rings 48 on the pull rod 44, the drive seat 45 can be connected at different positions on the pull rod 44, allowing adjustment of the extension range of the inner support head 42 and improving the adaptability of the pneumatic clamp 4.

[0058] In summary, compared with the prior art, this utility model has at least the following advantages:

[0059] The lathe for machining the outer diameter of a wheel hub provided by this utility model uses a pneumatic clamp to abut against the inner wall of the wheel hub, so that the wheel hub is concentrically and stably fixed on the spindle. With the help of a servo system to drive the spindle to rotate and a closed-loop stepper system to drive the axial and radial feed of the cutting tool, the outer diameter turning of the wheel hub can be realized. The servo system can effectively ensure the high-speed and stable rotation of the spindle, and the closed-loop stepper system, based on its closed-loop control characteristics, can ensure the high-precision feed of the cutting tool, effectively reducing the problems of feed fluctuation and unstable cutting force during the machining of the outer diameter of the wheel hub, thereby effectively improving the machining accuracy and machining efficiency of the outer diameter of the wheel hub.

[0060] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A lathe for machining the outer diameter of a wheel hub, characterized in that, Includes base, spindle, servo system, cutting tool, and closed-loop stepper system; The main shaft is rotatably mounted on the base, and a pneumatic clamp is mounted on the main shaft. The pneumatic clamp is used to abut against the inner wall of the hub to make the hub concentric and stable on the main shaft. The servo system is connected to the spindle drive and provides driving force for the spindle rotation; The cutting tool is mounted on the base via a lead screw and cross slide, which is used to realize the axial and radial movement of the cutting tool along the spindle. The closed-loop stepping system is connected to the lead screw and cross slide, providing driving force for the movement of the lead screw and cross slide.

2. The lathe for machining the outer diameter of a wheel hub as described in claim 1, characterized in that, The servo system includes a servo driver and a servo motor; The servo driver is electrically connected to the servo motor. The servo motor is fixed on the base and is connected to the main shaft drive.

3. The lathe for machining the outer diameter of a wheel hub as described in claim 1, characterized in that, The lead screw cross slide includes a Z-axis lead screw, an X-axis lead screw, a Z-axis drive seat, and an X-axis drive seat; The Z-axis lead screw is rotatably mounted on the base along the axis of the main shaft. The Z-axis drive seat is slidably mounted on the base and is threadedly connected to the Z-axis lead screw; The X-axis lead screw and the Z-axis lead screw are perpendicularly intersecting each other, and the X-axis lead screw is rotatably mounted on the Z-axis drive seat; The X-axis drive seat is slidably mounted on the Z-axis drive seat and is threadedly connected to the X-axis lead screw; The cutting tool is mounted on the X-axis drive mount.

4. The lathe for machining the outer diameter of a wheel hub as described in claim 3, characterized in that, The closed-loop stepper system includes an X-axis closed-loop stepper motor and a Z-axis closed-loop stepper motor; The X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are respectively fixed on the Z-axis drive seat and the base, and the X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are respectively connected to the X-axis lead screw and the Z-axis lead screw for transmission. Both the X-axis closed-loop stepper motor and the Z-axis closed-loop stepper motor are electrically connected to a closed-loop stepper driver.

5. The lathe for machining the outer diameter of a wheel hub as described in claim 1, characterized in that, The pneumatic clamp includes a pneumatic drive mechanism and a chuck seat; The sidewall of the chuck seat is retractably equipped with multiple inner support heads, and the chuck seat is fixed to the end of the main shaft. The pneumatic drive mechanism is mounted on the base and is used to drive multiple inner support heads to extend outward synchronously to abut against the inner sidewall of the wheel hub.

6. The lathe for machining the outer diameter of a wheel hub as described in claim 5, characterized in that, The chuck is detachably mounted on the spindle via a flange.

7. The lathe for machining the outer diameter of a wheel hub as described in claim 5, characterized in that, The pneumatic drive mechanism includes a pull rod, a drive base, and a cylinder; The pull rod passes through the main shaft and is slidably disposed with the main shaft. One end of the pull rod is slidably connected to the chuck seat, and the other end of the pull rod is connected to the drive seat through a rotary bearing. The drive seat is slidably mounted on the base along the axis of the main shaft; The cylinder is fixed on the base, and the output end of the cylinder is connected to the drive seat; When the cylinder output end extends, the pull rod, driven by the drive seat, causes the inner support head to extend outward.

8. The lathe for machining the outer diameter of a wheel hub as described in claim 7, characterized in that, The pull rod has a driving frustum at one end near the chuck seat, and each of the multiple inner support heads has a connecting inclined surface that matches the driving frustum.

9. The lathe for machining the outer diameter of a wheel hub as described in claim 7, characterized in that, Two rotary bearings are slidably mounted on the end of the pull rod away from the chuck seat. The two rotary bearings are threaded onto two fixed rings on the pull rod, which clamp a push-pull baffle. The push-pull baffle is fixedly connected to the drive seat.

10. The lathe for machining the outer diameter of a wheel hub as described in claim 1, characterized in that, The cutting tool is mounted on the lead screw cross slide via a quick-change tool holder.

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