A method and system for machining a shaft assembly

Abstract

The application relates to the technical field of machining, in particular to a shaft assembly machining method and system. The method comprises the following steps: based on one end of a shaft assembly being sleeved on a rotating assembly, a thimble part abuts against the other end of the shaft assembly with a first clamping force; wherein, in the sleeving process, the protruding part is extruded by the inner wall of the shaft assembly and moves towards the center axis of the rotating assembly; based on the rotating assembly rotating relative to the shaft assembly with a first acceleration, at least part of the protruding part moves away from the center axis of the rotating assembly and enters the raceway of the shaft assembly; based on part of the protruding part entering the raceway and the rotating assembly continuing to rotate, a machining part machines the shaft assembly. Thus, the problem that the positioning and clamping process of the shaft assembly is long is solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a method and system for machining shaft assemblies. Background Technology

[0002] In related technologies, the turning of the outer peripheral wall of shell-like workpieces (such as ball cage shells and three-column groove shells) with internal raceways typically involves the lathe spindle clamping one end of the workpiece via a chuck, and the tailstock center providing axial support and centering from the other end. The spindle drives the workpiece to rotate around its axis, and the cutting tool feeds radially and axially along the workpiece to complete the outer diameter turning. The chuck clamps the outer diameter of the workpiece and provides rotational torque, the tailstock center provides axial support and assists in centering, the spindle outputs rotational power, and the cutting tool removes excess material from the workpiece's outer peripheral surface. In another clamping method, the workpiece is centered by its internal hole engaging with a tapered locating element, and its rotation is driven by friction from the spindle end face. This method requires high precision in the locating surface and has a limited contact area. For shell-like parts with raw raceway end faces that have undergone heat treatment, if the tapered surface or end face is used as the locating and friction driving reference, the locating reference and driving reference coincide, resulting in a small contact area. This necessitates additional time for alignment and locking during the clamping stage.

[0003] However, the aforementioned sequence of alignment, locking, and rotation results in a significant time consumption during the clamping stage. When the workpiece end face is a rough surface or has undergone heat treatment, insufficient positioning surface accuracy makes it more prone to center misalignment and friction-driven slippage, affecting the machining accuracy of the outer surface. Currently, the overall positioning and clamping process before machining these types of shell-like parts is quite time-consuming. Summary of the Invention

[0004] To address the issue of long processing time in the positioning and clamping process of shaft assemblies, this invention provides a shaft assembly processing method and system.

[0005] In a first aspect, the present invention provides a method for machining a shaft assembly, the method comprising:

[0006] One end of the shaft assembly is fitted onto the rotating assembly, and the ejector pin abuts against the other end of the shaft assembly with a first clamping force; wherein, during the fitting process, the protrusion is squeezed by the inner peripheral wall of the shaft assembly and moves toward the central axis of the rotating assembly;

[0007] Based on the rotation of the rotating component relative to the shaft assembly with a first acceleration, at least a portion of the protrusion moves away from the central axis of the rotating component into the raceway of the shaft assembly;

[0008] The machining unit processes the shaft assembly as part of the protrusions enter the raceway and the rotating assembly continues to rotate.

[0009] Optionally, the machining of the shaft assembly by the machining unit, based on a portion of the protrusion entering the raceway and the rotating assembly continuously rotating, includes:

[0010] Based on the partial protrusion entering the raceway, the ejector pin abuts against the other end of the shaft assembly with a second clamping force; wherein, the first clamping force is less than the second clamping force;

[0011] The machining part processes the shaft assembly based on the second clamping force applied to the other end of the shaft assembly by the ejector pin and the continuous rotation of the rotating assembly.

[0012] Optionally, the step of having a portion of the protrusion enter the raceway and the ejector pin abutting against the other end of the shaft assembly with a second clamping force includes:

[0013] The rotational speed of the ejector pin is obtained based on the fact that a portion of the protrusion enters the raceway;

[0014] Based on the fact that the difference between the rotational speed of the ejector pin and the rotational speed of the rotating assembly at the same point in time is less than or equal to the speed difference threshold, the ejector pin abuts against the other end of the shaft assembly with a second clamping force.

[0015] Optionally, the machining part processes the shaft assembly based on the ejector pin portion abutting against the other end of the shaft assembly with a second clamping force and the rotating assembly continuously rotating, including:

[0016] The rotating assembly rotates with a second acceleration, based on the second clamping force applied to the other end of the shaft assembly by the ejector pin portion; wherein the second acceleration is greater than zero and less than the first acceleration;

[0017] The machining unit processes the shaft assembly based on the rotational speed of the rotating component reaching and maintaining the machining speed.

[0018] Optionally, the machining unit processes the shaft assembly based on the rotational speed of the rotating component reaching and maintaining the machining speed, including:

[0019] Based on the rotational speed of the rotating component reaching and maintaining the processing speed, the internal force between the end face of the shaft assembly and the contact portion of the rotating component is obtained;

[0020] The machining unit processes the shaft assembly based on the internal force being greater than the friction threshold.

[0021] Optionally, the shaft assembly processing method further includes:

[0022] Once the machining unit has completed machining of the shaft assembly, the transfer assembly moves the machined shaft assembly out of the machining position.

[0023] Optionally, the step of moving the processed shaft assembly out of the processing position after the processing unit has completed processing of the shaft assembly includes:

[0024] Based on the completion of the machining of the shaft assembly by the machining unit, the unloading jaws of the material transfer assembly move to the unloading position to hold the machined shaft assembly;

[0025] The unloading jaws hold the processed shaft assembly, and the transfer part of the material transfer assembly swaps the positions of the unloading jaws and the loading jaws.

[0026] Optionally, during the process of switching the positions of the unloading jaw and the loading jaw in the transfer part of the material transfer assembly, the loading jaw clamps a shaft assembly to be processed.

[0027] In a second aspect, the present invention provides a shaft assembly machining system, wherein the shaft assembly machining system is applied to any of the shaft assembly machining methods described in the first aspect, and the shaft assembly machining system comprises:

[0028] A rotating assembly includes a rotating unit and an ejector pin unit; the rotating unit and the ejector pin unit are spaced apart; the rotating unit includes a rotating column, a protrusion, an elastic part, and a rotating drive part; the protrusion is retractably disposed on the periphery of the rotating column; the elastic part connects the protrusion and the rotating column; the rotating drive part is drivenly connected to the rotating column; the ejector pin unit includes an ejector pin part and a top drive part; the top drive part is drivenly connected to the ejector pin part, driving the ejector pin part to move away from or towards the rotating column;

[0029] The processing component is spaced apart from the rotating component and is located on one side of the rotation center axis of the rotating column;

[0030] A shaft assembly includes a shaft unit and a housing unit; the housing unit includes a housing and a raceway; one side of the housing is open, and the other side is connected to the shaft unit; a hollow cavity is formed on the open side of the housing; the raceway is formed by recesses from the inner peripheral wall of the hollow cavity of the housing;

[0031] A control component is electrically connected to the rotary drive unit, the top drive unit, and the processing component, respectively.

[0032] Optionally, the control component further includes a controller and a detector; the controller is electrically connected to the rotary drive unit, the top drive unit, the processing component, and the detector respectively; the detector is used to acquire the rotational speed of the ejector pin.

[0033] Optionally, the rotating unit further includes an abutment portion; the abutment portion is disposed on the outer periphery of the rotating column and connected to the rotating column; the abutment portion is disposed on the side of the protrusion away from the ejector pin portion.

[0034] Optionally, the shaft assembly processing system further includes a material transfer assembly; the material transfer assembly includes a material transfer section, a material transfer section, a loading gripper, and a unloading gripper; the material transfer section is connected to the material transfer section; the material transfer section is driven connected to the loading gripper and the unloading gripper respectively.

[0035] To solve the problem of long positioning and clamping time for shaft assemblies, the present invention has the following advantages:

[0036] During the fitting process, the protrusion is squeezed by the inner peripheral wall of the shaft assembly and moves towards the central axis of the rotating assembly. This allows the protrusion to automatically retract and avoid the misalignment of the shaft assembly and the protrusion before they are precisely aligned, reducing the time spent on alignment during the clamping stage. By rotating the rotating assembly relative to the shaft assembly with a first acceleration, at least part of the protrusion moves away from the central axis of the rotating assembly and enters the raceway of the shaft assembly. The relative rotation enables the protrusion to automatically align with the raceway, reducing the time spent on manual alignment. With part of the protrusion entering the raceway and the rotating assembly continuing to rotate while the machining part processes the shaft assembly, the protrusion inserts into the raceway, causing the shaft assembly to rotate synchronously and be processed by the machining part. This shortens the time of the shaft assembly positioning and clamping process, improves clamping efficiency, and allows the shaft assembly to enter a processable state more quickly. Attached Figure Description

[0037] Figure 1 A schematic diagram of a shaft assembly machining method according to one embodiment is shown;

[0038] Figure 2 A schematic diagram of a shaft assembly machining system according to one embodiment is shown;

[0039] Figure 3 A schematic diagram of a rotating assembly and a processing assembly according to one embodiment is shown;

[0040] Figure 4 A first-view schematic diagram of a rotating assembly, a machining assembly, and a shaft assembly according to one embodiment is shown;

[0041] Figure 5 A second-view schematic diagram of a rotating assembly, a machining assembly, and a shaft assembly according to one embodiment is shown;

[0042] Figure 6 A cross-sectional schematic diagram of a rotating unit and shaft assembly according to one embodiment is shown;

[0043] Figure 7 A schematic diagram of a shaft assembly according to one embodiment is shown.

[0044] Reference numerals: 10, Rotating assembly; 11, Rotating unit; 111, Rotating column; 112, Protrusion; 113, Elastic part; 114, Rotation drive part; 115, Abutting part; 12, Ejector pin unit; 121, Ejector pin part; 122, Top drive part; 13, Base unit; 20, Shaft assembly; 21, Shaft unit; 211, Shaft body; 212, Top groove; 22, Shell unit; 221, Shell; 222, Raceway; 223, Chamfered part; 30, Machining assembly; 31, Machining part; 32, Machining drive part; 40, Material transfer assembly; 41, Material transfer part; 42, Material transfer part; 43, Loading gripper; 44, Unloading gripper. Detailed Implementation

[0045] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0046] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0047] In related technologies, the turning of shell-type 221 workpieces (such as ball cage shells and three-column groove shells) with internal raceways 222 typically involves the lathe spindle clamping one end of the workpiece via a chuck, and the tailstock center clamping and centering the workpiece from the other end. The spindle drives the workpiece to rotate around its axis, and the cutting tool feeds radially and axially along the workpiece to complete the external turning. Since positioning and driving often rely on the workpiece end face or outer diameter as a reference, during clamping, to ensure reliable rotation of the workpiece by the spindle without slippage, it is usually necessary to strictly align and lock the workpiece with the spindle before starting the rotation. When the workpiece end face is a rough surface or has undergone heat treatment, insufficient positioning surface accuracy makes it more prone to center offset and friction drive slippage, affecting the machining accuracy of the outer surface. Currently, the overall positioning and clamping process before machining these shell-type 221 parts is relatively time-consuming.

[0048] Example 1:

[0049] The shaft assembly 20 machining system is applied to the shaft assembly 20 machining method, such as... Figure 3 As shown, the shaft assembly 20 machining system includes a rotating assembly 10, a machining assembly 30, a shaft assembly 20, and a control assembly; the rotating assembly 10 includes a rotating unit 11 and a pin unit 12; the rotating unit 11 and the pin unit 12 are spaced apart along the axial direction of the rotating unit 11, and the space between them can be used to accommodate the shaft assembly 20; the rotating unit 11 includes a rotating column 111, a protrusion 112, an elastic part 113, and a rotating drive part 114; as shown... Figure 2 , Figure 6 As shown, the protrusion 112 is retractably disposed on the periphery of the rotating column 111; the elastic part 113 connects the protrusion 112 and the rotating column 111; the elastic force of the elastic part 113 allows the protrusion 112 to extend and retract radially along the rotating column 111; the rotation drive part 114 is drivenly connected to the rotating column 111 and can drive the rotating column 111 to rotate around its own axis; the ejector pin unit 12 includes an ejector pin part 121 and an ejector drive part 122; the ejector drive part 122 is drivenly connected to the ejector pin part 121 and drives the ejector pin part 121 to move away from or closer to the rotating column 111; the machining assembly 30 is spaced apart from the rotating assembly 10 and is disposed on one side of the rotation center axis of the rotating column 111; the machining assembly 30 can be used to machine the outer peripheral wall of the shaft assembly 20; as Figure 7 As shown, the shaft assembly 20 includes a shaft unit 21 and a housing unit 22; the housing unit 22 includes a housing 221 and a raceway 222; one side of the housing 221 is open, and the other side is connected to the shaft unit 21; a hollow cavity is formed on the open side of the housing 221; the raceway 222 is formed by recessing from the inner peripheral wall of the hollow cavity of the housing 221 toward the outer peripheral wall of the housing 221; the control component is electrically connected to the rotary drive unit 114, the top drive unit 122, and the machining component 30 respectively, so that the rotary drive unit 114, the top drive unit 122, and the machining component 30 can perform machining on the shaft assembly 20 according to a predetermined program.

[0050] This embodiment provides a method for machining a shaft assembly 20, such as... Figure 1 As shown, the method includes steps S10-S30, and each step will be described in detail below.

[0051] In step S10, one end of the inner circumferential surface of the shaft assembly 20 is sleeved on the outer circumferential side of the rotating assembly 10, and the ejector pin 121 abuts against the end of the shaft assembly 20 away from the rotating assembly 10 with a first clamping force; wherein, during the process of the shaft assembly 20 being sleeved on the rotating assembly 10, the protrusion 112 is squeezed by the inner circumferential wall of the shaft assembly 20 and moves toward the direction closer to the central axis of the rotating assembly 10, so that the protrusion 112 automatically retracts inward to avoid the raceway 222 before it is aligned, thereby reducing the time spent on alignment during the clamping stage.

[0052] In step S20, based on the rotation of the rotating assembly 10 relative to the shaft assembly 20 with a first acceleration, at least part of the protrusion 112 rotates with the relative rotation of the rotating column 111 and the raceway 222 until the protrusion 112 and the raceway 222 are aligned in the circumferential direction of the housing 221. The elastic part 113 can drive the protrusion 112 to move away from the central axis of the rotating assembly 10 and enter the raceway 222 of the shaft assembly 20. In this way, the relative rotation can be used to automatically align the protrusion 112 with the raceway 222, reducing the time spent on the process of aligning the protrusion 112 and the raceway 222.

[0053] In step S30, based on the condition that part of the protrusion 112 enters the raceway 222 and the rotating assembly 10 continues to rotate, the machining unit 31 processes the shaft assembly 20; after the protrusion 112 enters the raceway 222, it is inserted into the raceway 222 to drive the shaft assembly 20 to rotate synchronously with the rotating assembly 10. The machining unit 31 turns the outer peripheral surface of the rotating shaft assembly 20, thereby achieving stable rotational machining without relying on end face friction drive.

[0054] Furthermore, step S30 includes steps S31 and S32, and each step will be described in detail below: steps S10, S20, S31 and S32 are executed in sequence.

[0055] In step S31, based on the partial protrusion 112 entering the raceway 222, the ejector pin 121 abuts against the other end of the shaft assembly 20 with a second clamping force greater than the first clamping force, so that the shaft assembly 20 is further pressed between the end face of the rotating assembly 10 and the ejector pin 121, further fixing the relative displacement of the shaft assembly 20 and the rotating assembly 10 in its own axial direction, and providing axial force for correcting the runout.

[0056] In step S32, based on the second clamping force of the ejector pin 121 against the other end of the shaft assembly 20 and the continuous rotation of the rotating assembly 10, the processing unit 31 processes the shaft assembly 20, so that the shaft assembly 20 is stably rotated and processed on the basis of being aligned.

[0057] Furthermore, step S31 includes steps S311 and S312, and each step will be described in detail below: steps S10, S20, S311, S312 and S32 are executed in sequence.

[0058] Step S311: Based on the partial protrusion 112 entering the raceway 222, the rotational speed of the ejector pin 121 is obtained;

[0059] In step S312, based on the fact that the difference between the rotational speed of the ejector pin 121 and the rotational speed of the rotating assembly 10 at the same time point is less than or equal to the speed difference threshold, it can be determined that the protrusion 112 has entered the raceway 222 or that the friction between the rotating assembly 10 and the shaft assembly 20 is sufficient, allowing the rotating assembly 10 to stably drive the housing unit 22 to rotate. Subsequently, the ejector pin 121 abuts against the other end of the shaft assembly 20 with a second clamping force. Thus, step S311 obtains the rotational speed of the ejector pin 121, and step S312 causes the ejector pin 121 to abut with a second clamping force when the speed difference meets the threshold condition, so that the timing of the force application corresponds to the state of the protrusion 112 entering the raceway 222.

[0060] Furthermore, step S32 includes steps S321 and S322, and each step will be described in detail below: steps S10, S20, S31, S321 and S322 are executed in sequence.

[0061] In step S321, based on the second clamping force of the ejector pin 121 against the other end of the shaft assembly 20, the rotating assembly 10 rotates with a second acceleration that is greater than zero and less than the first acceleration, so that the rotational speed smoothly transitions from the alignment stage to the machining stage.

[0062] In step S322, based on the rotational speed of the rotating component 10 reaching and maintaining the machining speed, the machining unit 31 processes the shaft assembly 20, so that the shaft assembly 20 is processed at a stable machining speed.

[0063] In step S20, the rotating assembly 10 starts from rest and rotates with a large first acceleration. When the maximum static friction force that the rotating assembly 10 and the shaft assembly 20 can provide is insufficient to support the first acceleration, the displacement of the shaft assembly 20 and the rotating assembly 10 in the circumferential direction of the rotating assembly 10 per unit time is large, thereby allowing the protrusion 112 to enter the raceway 222 more quickly. In steps S321 and S322, the control assembly determines that the protrusion 112 has entered the raceway 222, and the rotating assembly 10 can stably drive the shaft assembly 20. At this time, using a smaller second acceleration and maintaining the rotational speed of the rotating assembly 10 at the processing speed can reduce the energy consumption, load, and wear of the rotating assembly 10, and can also control the vibration of the shaft assembly 20, so that the processing assembly 30 can process the shaft assembly 20 more accurately.

[0064] Furthermore, step S322 includes steps S3221 and S3222, which will be described in detail below: steps S10, S20, S31, S321, S3221, and S3222 are executed sequentially.

[0065] Step S3221: Based on the rotational speed of the rotating component 10 reaching and maintaining the processing speed, obtain the internal force between the end face of the shaft assembly 20 and the abutment portion 115 of the rotating component 10; wherein, the internal force can be the force between the end face of the shaft assembly 20 and the abutment portion 115 of the rotating component 10 along the central axis of the shaft assembly 20.

[0066] In step S3222, based on the internal force being greater than the friction threshold, the machining unit 31 processes the shaft assembly 20. Thus, step S3221 obtains the internal force of the end face contact, and step S3222, when the internal force meets the friction threshold condition, the machining unit 31 processes the shaft assembly 20, so that the machining is performed while the shaft assembly 20 is reliably driven.

[0067] Furthermore, in scenarios where the shaft assembly 20 is installed and used after machining, the end face of the shaft assembly 20 that abuts against the abutment portion 115 does not need to mate with other components, but the raceway 222 needs to mate with the rolling elements. Therefore, it is necessary to avoid damage to the raceway 222 during the machining of the shaft assembly 20. To this end, the shaft assembly 20 is machined again when the internal force is greater than the friction threshold. This allows the abutment portion 115 and the end face of the shaft assembly 20 to share some of the force between the raceway 222 and the protrusion 112. While the protrusion 112 drives the raceway 222 to rotate, the abutment portion 115 also drives the end face of the shaft assembly 20 to rotate, thereby avoiding excessive force between the raceway 222 and the protrusion 112 and achieving the effect of reducing wear on the raceway 222.

[0068] Furthermore, the machining method of shaft assembly 20 also includes step S40, which will be described in detail below: steps S10, S20, S30 and S40 are executed in sequence.

[0069] In step S40, after the machining unit 31 completes the machining of the shaft assembly 20, the material transfer assembly 40 moves the machined shaft assembly 20 out of the machining position, freeing up the machining position for subsequent material loading. The machining position can be the space between the rotating unit 11 and the ejector pin unit 12.

[0070] Furthermore, step S40 includes steps S41 and S42, and each step will be described in detail below: steps S10, S20, S30, S41 and S42 are executed in sequence.

[0071] Step S41: After the shaft assembly 20 is processed by the processing unit 31, the unloading jaw 44 of the transfer assembly 40 moves to the unloading position to hold the processed shaft assembly 20.

[0072] In step S42, based on the unloading gripper 44 holding the machined shaft assembly 20, the transfer part 42 of the material transfer assembly 40 swaps the positions of the unloading gripper 44 and the loading gripper 43, so that the loading gripper 43 rotates to the machining position side and the unloading gripper 44 rotates to the material position side. Thus, the loading operation is completed by the loading gripper 43, and the unloading operation is completed by the unloading gripper 44, reducing the cumulative error caused by repeated positioning of the loading gripper 43 and the unloading gripper 44.

[0073] Furthermore, in step S42, during the process of the material transfer part 42 of the material transfer component 40 switching the positions of the unloading gripper 44 and the loading gripper 43, the loading gripper 43 clamps a shaft assembly 20 to be processed, so that the unloading and loading actions are carried out in parallel, further shortening the cycle time occupied by unloading and loading.

[0074] In the implementation of the shaft assembly 20 processing method of this embodiment, one end of the shaft assembly 20 is first sleeved on the rotating assembly 10, and the ejector pin 121 gently pushes the other end of the shaft assembly 20 with a first clamping force. Then, the rotating assembly 10 rotates relative to the shaft assembly 20 with a first acceleration, so that the protrusion 112 automatically aligns and slides into the raceway 222. The ejector pin 121 then applies force and speeds up to the processing speed, and the machining part 31 completes the turning. After the processing is completed, the workpiece is removed by the transfer assembly 40. When it is necessary to reclamp, the shaft assembly 20 is removed from the rotating assembly 10 and another shaft assembly 20 is sleeved to start the next cycle.

[0075] Example 2:

[0076] This embodiment provides a shaft assembly 20 machining system, which is applied to any of the shaft assembly 20 machining methods in Embodiment 1 above, such as... Figure 3 As shown, the shaft assembly 20 machining system may include: a rotary assembly 10, a machining assembly 30, a shaft assembly 20, and a control assembly;

[0077] The rotating assembly 10 includes a rotating unit 11 and a ejector pin unit 12, which are spaced apart. The rotating unit 11 includes a rotating column 111, a protrusion 112, an elastic part 113, and a rotating drive part 114. The protrusion 112 is retractably disposed on the periphery of the rotating column 111. When the shaft assembly 20 is sleeved on the outer periphery of the rotating column 111, the protrusion 112 is pressed by the inner peripheral wall of the shaft assembly 20 and moves towards the central axis of the rotating column 111, and moves away from the central axis to the corresponding position of the raceway 222 during relative rotation. The elastic part 113 connects the protrusion 112 and the rotating column 111, providing a retractable restoring force for the protrusion 112. The rotating drive part 114 is drivenly connected to the rotating column 111 and is used to drive the rotating column 111 to rotate around the central axis of the rotating column 111. The rotary drive unit 114 can be a motor that drives the rotating column 111 to rotate via a reducer, or it can be a hydraulic motor or a pneumatic motor that drives the rotating column 111, or it can be a stepper motor or a torque motor that directly drives the rotating column 111, as long as it can output torque that causes the rotating column 111 to rotate relative to the shaft assembly 20. The ejector unit 12 includes an ejector part 121 and a top drive unit 122; the top drive unit 122 is driven to connect with the ejector part 121, driving the ejector part 121 to move away from or towards the rotating column 111, thereby lightly pressing the other end of the shaft assembly 20 with a first clamping force during the fitting stage, and pressing the shaft assembly 20 with a larger second clamping force during the processing stage. The top drive unit 122 can be a hydraulic cylinder or a pneumatic cylinder that drives the ejector part 121 to move axially; or it can be a servo electric cylinder that drives the ejector part 121 and adjusts the clamping force in real time. After the ejector pin 121 comes into contact with the shaft assembly 20, it can rotate passively with the shaft assembly 20. If necessary, the top drive part 122 can also be used as the active driving force to drive the ejector pin 121 to rotate.

[0078] The machining component 30 is spaced apart from the rotating component 10 and located on one side of the rotation center axis of the rotating column 111. It performs turning on the outer peripheral surface of the shaft assembly 20 when the shaft assembly 20 rotates with the rotating component 10. The machining part 31 can be a turning tool; or it can be a milling cutter or a grinding tool, as long as it can remove the excess material on the outer peripheral surface of the shaft assembly 20.

[0079] The shaft assembly 20 includes a shaft unit 21 and a housing unit 22. The housing unit 22 includes a housing 221 and a raceway 222. One side of the housing 221 is open, and the other side is connected to the shaft unit 21. A hollow cavity is formed on the open side of the housing 221. The raceway 222 is formed by a recess in the inner peripheral wall of the hollow cavity of the housing 221, allowing the protrusion 112 to be inserted and drive the entire shaft assembly 20 to rotate. The control component is electrically connected to the rotary drive unit 114, the top drive unit 122, and the machining component 30, respectively, and is used to coordinate the operation of each component.

[0080] Furthermore, the control assembly also includes a controller and a detector. The controller is electrically connected to the rotary drive unit 114, the top drive unit 122, the machining assembly 30, and the detector, respectively, and is used to coordinate the start / stop, rotational speed, and clamping force of each component. The detector is used to acquire the rotational speed of the ejector pin 121, thereby determining whether the protrusion 112 has entered the raceway 222 with relative rotation. When the difference between the rotational speed of the ejector pin 121 and the rotational speed of the rotary assembly 10 is less than a speed difference threshold, it is determined that it has entered. The controller can be a programmable logic controller, or it can be a microcontroller, industrial computer, motion controller, or CNC system. The detector can be a speed sensor installed near the ejector pin 121; or it can be an encoder, photoelectric sensor, or proximity sensor, as long as it can acquire the rotational speed of the ejector pin 121.

[0081] Furthermore, the rotating unit 11 also includes an abutment portion 115. The abutment portion 115 is disposed on the outer periphery of the rotating column 111 and connected to the rotating column 111, and is located on the side of the protrusion 112 away from the ejector pin portion 121. During machining, it abuts against the end face of the shaft assembly 20, and together with the tapered surface of the ejector pin portion 121, ensures that the center line of the shaft assembly 20 coincides with the center line of the rotating assembly 10. Thus, the abutment portion 115 increases the contact area between the rotating assembly 10 and the end face of the shaft assembly 20, enabling reliable torque transmission through end face friction.

[0082] Furthermore, the machining system for shaft assembly 20 also includes a material transfer assembly 40. For example... Figure 2 As shown, the material transfer assembly 40 includes a material transfer section 41, a material transfer section 42, a loading gripper 43, and a unloading gripper 44. The material transfer section 42 is connected to the material transfer section 41 and is driven to the loading gripper 43 and the unloading gripper 44 respectively. The material transfer section 41 drives the material transfer assembly 42 to reciprocate between the loading and unloading positions, while the material transfer section 42 swaps the positions of the loading gripper 43 and the unloading gripper 44. The loading gripper 43 and the unloading gripper 44 are independently configured. The loading gripper 43 is responsible for loading the shaft assembly 20 to be processed into the processing position, and the unloading gripper 44 is responsible for removing the processed shaft assembly 20. This division of labor prevents the accumulation of feeding errors. The loading gripper 43 and the unloading gripper 44 can be pneumatic grippers, electric grippers, or mechanical grippers. The material transfer unit 42 can be a rotary cylinder that drives the loading gripper 43 and the unloading gripper 44 to rotate and change positions; or it can be a turntable or indexing plate to achieve position switching.

[0083] In this embodiment, when the shaft assembly 20 processing system is in use, the loading jaws 43 of the transfer assembly 40 first load the shaft assembly 20 to be processed between the rotating assembly 10 and the ejector pin unit 12. The ejector pin part 121 gently pushes the other end of the shaft assembly 20 with a first clamping force. The rotation drive part 114 drives the rotating column 111 to rotate relative to each other with a first acceleration, so that the protrusion 112 automatically aligns and slides into the raceway 222. Then, the ejector pin part 121 presses with a second clamping force, the rotating assembly 10 speeds up to the processing speed, and the processing part 31 completes the turning. After the processing is completed, the transfer assembly 40 removes the workpiece. When maintenance is required, the electrical connections of each component are disconnected and the shaft assembly 20 is removed by the transfer assembly 40.

[0084] In other embodiments, such as Figure 2 As shown, the rotating assembly 10 also includes a base unit 13. The rotating assembly 10, the ejector pin unit 12, the processing assembly 30, and the transfer assembly 40 are all mounted on the base unit 13. The base unit 13 provides the mounting foundation and relative position reference for each component. Figure 3 As shown, the machining assembly 30 includes a machining drive unit 32 and a machining unit 31. The machining drive unit 32 drives the machining unit 31 to feed along the axial direction of the shaft assembly 20 to turn the outer peripheral surface of the shaft assembly 20. In some embodiments, the shell unit 22 also includes a chamfered portion 223; the chamfered portion 223 is recessed from the inner peripheral wall of the shell 221 towards the outer peripheral wall; the chamfered portion 223 is disposed at the end of the shell 221 away from the shaft body 211; the inner diameter of the chamfered portion 223 gradually increases along the direction from the shaft body 211 to the shell 221; during the process of the shaft assembly 20 moving along the direction of the gradually decreasing inner diameter of the chamfered portion 223 to be fitted onto the outer peripheral side of the rotating unit 11, the protrusion 112 can abut against and slide relative to the chamfered portion 223, thereby allowing the protrusion 112 to gradually move towards the central axis of the rotating column 111. Figure 4 , Figure 5 As shown, the shaft unit 21 includes a shaft body 211 and a top groove 212; the top groove 212 is recessed from the end of the shaft body 211 away from the housing 221 toward the housing 221; the other end of the ejector pin portion 121 abutting the shaft assembly 20 may be such that at least part of the ejector pin portion 121 enters the enclosing space of the top groove 212 and the top groove 212 abuts against the ejector pin portion 121, which can limit the amount of displacement of the shaft body 211 relative to the ejector pin along its own axial direction, thereby ensuring that the machining part 31 can accurately machine the shaft assembly 20.

[0085] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A method for machining a shaft assembly, characterized in that, The shaft assembly processing method includes: one end of the shaft assembly is sleeved on a rotating assembly, and the ejector pin abuts against the other end of the shaft assembly with a first clamping force; wherein, during the sleeved process, the protrusion is squeezed by the inner peripheral wall of the shaft assembly and moves toward the central axis of the rotating assembly; Based on the rotation of the rotating component relative to the shaft assembly with a first acceleration, at least a portion of the protrusion moves away from the central axis of the rotating component into the raceway of the shaft assembly; The machining unit processes the shaft assembly as part of the protrusions enter the raceway and the rotating assembly continues to rotate.

2. The shaft assembly processing method according to claim 1, characterized in that, The machining unit processes the shaft assembly based on a portion of the protrusions entering the raceway and the rotating assembly continuously rotating, including: Based on the partial protrusion entering the raceway, the ejector pin abuts against the other end of the shaft assembly with a second clamping force; wherein, the first clamping force is less than the second clamping force; The machining part processes the shaft assembly based on the second clamping force applied to the other end of the shaft assembly by the ejector pin and the continuous rotation of the rotating assembly.

3. The shaft assembly processing method according to claim 2, characterized in that, The portion of the protrusion enters the raceway, and the ejector pin abuts against the other end of the shaft assembly with a second clamping force, including: The rotational speed of the ejector pin is obtained based on the fact that a portion of the protrusion enters the raceway; Based on the fact that the difference between the rotational speed of the ejector pin and the rotational speed of the rotating assembly at the same point in time is less than or equal to the speed difference threshold, the ejector pin abuts against the other end of the shaft assembly with a second clamping force.

4. A method for machining a shaft assembly according to claim 2, characterized in that, The machining unit processes the shaft assembly based on the ejector pin portion abutting against the other end of the shaft assembly with a second clamping force and the rotating assembly continuously rotating, including: The rotating assembly rotates with a second acceleration, based on the second clamping force applied to the other end of the shaft assembly by the ejector pin portion; wherein the second acceleration is greater than zero and less than the first acceleration; The machining unit processes the shaft assembly based on the rotational speed of the rotating component reaching and maintaining the machining speed.

5. A method for machining a shaft assembly according to claim 4, characterized in that, The machining unit processes the shaft assembly based on the rotational speed of the rotating component reaching and maintaining the machining speed, including: Based on the rotational speed of the rotating component reaching and maintaining the processing speed, the internal force between the end face of the shaft assembly and the contact portion of the rotating component is obtained; The machining unit processes the shaft assembly based on the internal force being greater than the friction threshold.

6. A method for machining a shaft assembly according to claim 1, characterized in that, The shaft assembly processing method further includes: Once the machining unit has completed machining of the shaft assembly, the transfer assembly moves the machined shaft assembly out of the machining position.

7. A method for machining a shaft assembly according to claim 6, characterized in that, The step of processing the shaft assembly by the processing unit and then moving the processed shaft assembly out of the processing position by the material transfer component includes: After the machining unit completes the machining of the shaft assembly, the unloading jaws of the material transfer assembly move to the unloading position to hold the machined shaft assembly. The unloading jaws hold the processed shaft assembly, and the transfer part of the material transfer assembly swaps the positions of the unloading jaws and the loading jaws.

8. A method for machining a shaft assembly according to claim 7, characterized in that, During the process of switching the positions of the unloading jaw and the loading jaw in the transfer part of the material transfer component, the loading jaw clamps a shaft assembly to be processed.

9. A shaft assembly machining system, characterized in that, The shaft assembly machining system is applied to a shaft assembly machining method according to any one of claims 1-8, and the shaft assembly machining system comprises: A rotating assembly includes a rotating unit and an ejector pin unit; the rotating unit and the ejector pin unit are spaced apart; the rotating unit includes a rotating column, a protrusion, an elastic part, and a rotating drive part; the protrusion is retractably disposed on the periphery of the rotating column; the elastic part connects the protrusion and the rotating column; the rotating drive part is drivenly connected to the rotating column; the ejector pin unit includes an ejector pin part and a top drive part; the top drive part is drivenly connected to the ejector pin part, driving the ejector pin part to move away from or towards the rotating column; The processing component is spaced apart from the rotating component and is located on one side of the rotation center axis of the rotating column; A shaft assembly includes a shaft unit and a housing unit; the housing unit includes a housing and a raceway; one side of the housing is open, and the other side is connected to the shaft unit; a hollow cavity is formed on the open side of the housing; the raceway is formed by recesses from the inner peripheral wall of the hollow cavity of the housing; A control component is electrically connected to the rotary drive unit, the top drive unit, and the processing component, respectively.

10. A shaft assembly machining system according to claim 9, characterized in that, The control component further includes a controller and a detector; the controller is electrically connected to the rotary drive unit, the top drive unit, the processing component, and the detector respectively; the detector is used to obtain the rotational speed of the ejector pin.

11. A shaft assembly machining system according to claim 9, characterized in that, The rotating unit further includes an abutting part; the abutting part is disposed on the outer periphery of the rotating column and connected to the rotating column; the abutting part is disposed on the side of the protrusion away from the ejector pin.

12. A shaft assembly machining system according to claim 9, characterized in that, The shaft assembly processing system further includes a material transfer assembly; the material transfer assembly includes a material transfer section, a material transfer section, a loading gripper, and a unloading gripper; the material transfer section is connected to the material transfer section; the material transfer section is driven to be connected to the loading gripper and the unloading gripper respectively.

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