Hole machining method and device for flange yoke of transmission shaft

Abstract

The invention relates to the technical field of transmission shaft flange yokes, in particular to a hole machining method and device for a transmission shaft flange yoke. The method comprises the steps of controlling a flange yoke to rotate around a first axis based on completion of flange yoke clamping; on the basis that the flange yoke is in the rotating state, the compound tool is controlled to move, and the first semi-finished hole is chambered through the rough boring tool to form a second semi-finished hole; on the basis that machining of the second semi-finished hole is completed, the compound tool is controlled to move, a snap spring groove is machined in the second semi-finished hole through a grooving tool, and a third semi-finished hole is formed; the snap spring groove is connected between the expansion hole and the positioning hole; the diameter of the snap spring groove is larger than that of the expansion hole. Therefore, the problem of how to process the lug hole convenient for assembling the clamp spring is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission shaft flange forks, and in particular to a method and device for machining holes in a transmission shaft flange fork. Background Art

[0002] The drive shaft flange yoke plays a crucial role in connecting the drive shaft to the cross-axis universal joint in a mechanical transmission system. The yoke features an ear hole, which serves as the bearing hole and is the core component for mounting the cross-axis universal joint, providing the necessary space for stable assembly. Furthermore, a retaining ring groove is machined into the ear hole. This groove serves to axially secure the universal joint bearing, preventing axial movement during transmission that could affect overall transmission stability and reliability, thereby ensuring efficient and stable power transmission between the drive shaft and the universal joint.

[0003] However, in actual production operations, due to the elastic deformation characteristics and specific structural dimensions of the retaining spring itself, the retaining spring is prone to jamming and skewing during the insertion process, which not only reduces assembly efficiency but may also cause damage to the retaining spring or the inner wall of the ear hole. At the same time, the expansion process requires additional equipment, resulting in low efficiency. Therefore, it is necessary to expand the ear hole so that the hole size meets the requirements for efficient assembly of the retaining spring. However, the precision requirements for expanding the hole at one end of the ear hole are high, which increases the complexity of the ear hole processing. Therefore, how to process the ear hole that is convenient for assembling the retaining spring has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In order to solve the problem of how to machine an ear hole that is convenient for assembling a retaining ring, the present invention provides a method and device for machining a hole of a transmission shaft flange fork.

[0005] In a first aspect, the present invention provides a method for machining a hole in a transmission shaft flange fork, the method comprising:

[0006] Upon completion of the flange fork clamping, the flange fork is controlled to rotate about a first axis; wherein the flange fork comprises an integrally formed flange body and two lugs; a first semi-finished hole is formed on the lug; and the first axis coincides with an axis of the first semi-finished hole;

[0007] Based on the flange fork being in a rotating state, the composite tool is controlled to move so as to expand the first semi-finished hole to form a second semi-finished hole by a rough boring tool; wherein the composite tool includes a tool holder, a rough boring tool, and a slotting tool; the rough boring tool and the slotting tool are respectively connected to the tool holder; the second semi-finished hole includes an expansion hole and a positioning hole; the diameter of the expansion hole is larger than the diameter of the positioning hole; the expansion hole is connected to the positioning hole; and the diameter of the positioning hole is larger than the diameter of the first semi-finished hole;

[0008] Based on the completion of the processing of the second semi-finished hole, the movement of the composite tool is controlled to process a retaining ring groove in the second semi-finished hole through a grooving tool to form a third semi-finished hole; the retaining ring groove is connected between the expansion hole and the positioning hole; the diameter of the retaining ring groove is larger than the diameter of the expansion hole.

[0009] In some embodiments, based on the flange fork being in a rotating state, controlling the composite tool to move so as to expand the first semi-finished hole to form a second semi-finished hole by a rough boring tool comprises:

[0010] Based on the flange fork being in a rotating state, controlling the composite tool to move along the second axis until a first tool spread is adjusted to a first radius value; wherein the second axis is perpendicular to the first axis; the first tool spread is a distance that the rough boring tool deviates from the first axis; and the first radius is a radius of the expanded hole;

[0011] Based on the first tool expansion amount being the first radius value, controlling the composite tool to move along the first axis until the rough boring tool forms the expanded hole;

[0012] Based on the completion of the expansion hole processing, controlling the composite tool to move along the second axis until the first expansion amount is adjusted to a second radius value; wherein the second radius value is the axis of the positioning hole;

[0013] Based on the first tool extension amount being the second radius value, the composite tool is controlled to move along the first axis until the rough boring tool forms the positioning hole and the second semi-finished hole is completed.

[0014] In some embodiments, based on the completion of machining of the second semi-finished hole, controlling the composite tool to move so as to machine a retaining ring groove in the second semi-finished hole by a grooving cutter to form a third semi-finished hole includes:

[0015] Based on the completion of machining the second semi-finished hole, controlling the composite tool to move along the first axis until the grooving tool is located at a preset grooving position of the second semi-finished hole;

[0016] Based on the grooving cutter being located at the preset grooving position, the composite tool is controlled to move along the second axis until the second tool extension amount is a third radius value, the retaining ring groove is processed and formed, and the third semi-finished hole is processed; wherein, the second tool extension amount is the distance that the grooving cutter deviates from the first axis; the third radius value is the radius of the retaining ring groove.

[0017] In some embodiments, upon completion of machining the second semi-finished hole, controlling the composite tool to move along the first axis until the grooving tool is located at a preset grooving position of the second semi-finished hole, the method for machining a hole of a transmission shaft flange fork further includes:

[0018] Based on the completion of the processing of the second semi-finished hole, the composite tool is controlled to move along the second axis until the second tool spread is smaller than the radius of the positioning hole; when the processing of the second semi-finished hole is completed, the tool holder is passed through the second semi-finished hole, and the corresponding support ear is located between the rough boring tool and the grooving tool.

[0019] In some embodiments, the method for machining a hole of a transmission shaft flange fork further includes:

[0020] Based on the second tool spread being the third radius value, the composite tool is controlled to remain stationary for a preset time period.

[0021] In some embodiments, the method for machining a hole of a transmission shaft flange fork further includes:

[0022] Based on the composite tool remaining stationary for the preset time period, controlling the composite tool to move along the second axis until a first spread amount is smaller than a radius of the positioning hole and a second spread amount is smaller than a radius of the expansion hole; wherein the first spread amount is a distance that the rough boring tool deviates from the first axis;

[0023] Based on the fact that the first spread amount is smaller than the radius of the positioning hole and the second spread amount is smaller than the radius of the expansion hole, the composite tool is controlled to move along the first axis to separate the composite tool from the flange fork.

[0024] In some embodiments, when the grooving cutter is located at the preset grooving position, the projection of the grooving cutter cutting edge width along the second axis covers the connecting portion between the expansion hole and the positioning hole in the second semi-finished hole.

[0025] In some embodiments, the method for machining a hole of a transmission shaft flange fork further includes:

[0026] Based on the completion of machining of the third semi-finished hole, a fine boring tool is used to perform fine boring machining on the third semi-finished hole to form a bearing hole.

[0027] In a second aspect, the present invention provides a hole machining device for a transmission shaft flange fork, which is applied to the hole machining method for a transmission shaft flange fork described in any one of the first aspects.

[0028] The hole processing device of the transmission shaft flange fork includes:

[0029] A machine tool assembly, comprising a worktable, a clamping unit, a rough boring spindle, and a spreading head; the clamping unit is rotatably connected to the worktable about a first axis; the clamping unit is used to clamp a flange fork; the rough boring spindle is slidably connected to the worktable along the first axis; the spreading head is slidably connected to the rough boring spindle along a second axis; the first axis is perpendicular to the second axis;

[0030] A composite tool, comprising a tool holder, a rough boring tool and a grooving tool; the tool holder is parallel to the first axis; the rough boring tool and the grooving tool are respectively connected to the tool holder; the tool holder is connected to the spreading head; the height of the rough boring tool protruding from the tool holder along the second axis is a first height; the height of the grooving tool protruding from the tool holder along the second axis is a second height; the first height is smaller than the second height; the width of the cutting edge of the rough boring tool along the first axis is a first width; the width of the cutting edge of the grooving tool along the second axis is a second width; the first width is smaller than the second width.

[0031] In some embodiments, the machine tool assembly also includes a precision boring spindle and a sliding platform; the precision boring spindle is slidingly connected to the worktable along the first axis; the sliding platform is slidingly connected to the worktable along the third axis; the third axis is perpendicular to the first axis and the second axis respectively; the clamping unit is rotationally connected to the sliding platform around the first axis.

[0032] In order to solve the problem of how to process ear holes that are convenient for assembling the retaining spring, the present invention has the following advantages:

[0033] By controlling the rotation of the flange fork about a first axis that coincides with the axis of the first semi-finished hole, the composite tool, consisting of a tool holder, a rough boring tool, and a grooving tool, is controlled based on this rotational state. The rough boring tool expands the first semi-finished hole to form a second semi-finished hole, comprising an expansion hole and a locating hole. The second semi-finished hole is a stepped hole. The larger diameter expansion hole facilitates assembly with the circlip groove during subsequent assembly. The composite tool is then controlled to form a third semi-finished hole in the second semi-finished hole, with the grooving tool forming a circlip groove connecting the expansion hole and the locating hole. This achieves a single-step formation of the stepped hole and the circlip groove. By integrating the rough boring tool and grooving tool into the composite tool, the number of clamping operations is reduced, thereby avoiding the increased switching time and positioning errors associated with separate machining steps, ultimately improving the efficiency and accuracy of the hole. Furthermore, the rough boring tool has a relatively thin blade head. If used to machine the circlip groove, this structural characteristic results in lower machining efficiency. Furthermore, the thin blade head is prone to vibration during machining, making it difficult to maintain machining accuracy. The rough boring tool has a larger head, which can not only complete the processing of the retaining ring groove in one go, but also has less vibration during the processing, which can effectively ensure the processing accuracy and better meet the needs of efficient processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart showing a method for machining a hole in a transmission shaft flange fork according to an embodiment is shown;

[0035] Figure 2 A schematic diagram showing a hole machining device for a transmission shaft flange fork according to an embodiment;

[0036] Figure 3 A partial cross-sectional view of a drive shaft flange fork is shown;

[0037] Figure 4 A schematic diagram of a composite tool is shown.

[0038] Figure numerals: flange fork 10; flange body 11; support ear 12; bearing hole 13; expansion hole 131; retaining ring groove 132; positioning hole 133; machine tool assembly 20; worktable 21; rough boring spindle 22; spreader head 23; fine boring spindle 24; compound tool 30; tool holder 31; rough boring tool 32; grooving tool 33. DETAILED DESCRIPTION

[0039] 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 implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0040] As used herein, the term "including" 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 "based, at least in part, 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." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to 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, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, 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 specified, "plurality" means two or more.

[0041] In actual production, due to the inherent elastic deformation characteristics and specific structural dimensions of the retaining spring, it is prone to jamming and skewing during insertion, which not only reduces assembly efficiency but can also damage the retaining spring or the inner wall of the ear hole. Therefore, the ear hole needs to be enlarged to a diameter sufficient for efficient retaining spring assembly. However, enlarging one end of the ear hole requires high precision, which increases the complexity of ear hole machining. Therefore, how to produce an ear hole that is convenient for retaining spring assembly has become a technical problem that needs to be solved urgently. To address the above-mentioned issues, the present application provides a method for machining a hole in a drive shaft flange fork 10.

[0042] Example 1:

[0043] In this embodiment, if Figure 1As shown, a method for machining a hole of a transmission shaft flange fork 10 includes steps S10 to S30. Steps S10 to S30 are described in detail below:

[0044] In step S10, upon completion of the flange fork 10 clamping, the flange fork 10 is controlled to rotate about the first axis. This provides a stable rotational reference for subsequent machining, ensuring the precise relative position of the composite tool 30 and the first semi-finished hole during machining, thereby improving machining accuracy. The flange fork 10 comprises an integrally formed flange body 11 and two lugs 12, which enhance the overall structural strength of the flange fork 10. The lugs 12 define the first semi-finished hole, with the first axis coinciding with the axis of the first semi-finished hole.

[0045] In step S20, based on the flange fork 10 being in a rotating state, the composite tool 30 is controlled to move so as to expand the first semi-finished hole to form a second semi-finished hole using the rough boring tool 32. During the machining process, the flange fork 10 rotates, but the composite tool 30 does not rotate. The composite tool 30 includes a tool holder 31, a rough boring tool 32, and a grooving tool 33. The rough boring tool 32 and the grooving tool 33 are respectively connected to the tool holder 31. The second semi-finished hole includes an expansion hole 131 and a positioning hole 133. The diameter of the expansion hole 131 is larger than the diameter of the positioning hole 133, and the expansion hole 131 is connected to the positioning hole 133. The diameter of the positioning hole 133 is larger than the diameter of the first semi-finished hole. By using the rough boring tool 32 to expand the first semi-finished hole to form a second semi-finished hole including an expanded hole 131 and a positioning hole 133 while the flange fork 10 is rotating, the stepped hole is formed in one step, multiple clamping caused by step-by-step processing is avoided, and process switching time is saved. At the same time, the use of the rough boring tool 32 to expand the hole can reduce vibration and ensure processing accuracy; the rough boring tool 32 and the grooving tool 33 are integrated on the composite tool 30 to prepare for the subsequent processing of the retaining ring groove 132, reducing the number of tool changes and further improving processing efficiency.

[0046] In step S30, upon completion of machining the second semi-finished hole, the composite tool 30 is controlled to move so that the grooving tool 33 can machine a retaining spring groove 132 in the second semi-finished hole, thereby forming a third semi-finished hole. The retaining spring groove 132 is connected between the expanded hole 131 and the positioning hole 133, and its diameter is larger than that of the expanded hole 131. Thus, the retaining spring groove 132, which connects between the expanded hole 131 and the positioning hole 133, is machined in the second semi-finished hole by the grooving tool 33. The wide width of the grooving tool 33 allows the retaining spring groove 132 to be machined in a single operation, eliminating the need for multiple machining operations and saving machining time. The retaining spring groove 132 is positioned on a stepped surface, and the structure of the expanded hole 131 allows the compressed retaining spring to be placed into the ear hole without requiring significant compression, facilitating its installation. Simultaneously, the same composite tool 30 is used to perform both hole enlargement and grooving, saving one clamping operation and two clamping operations in total, significantly improving hole machining efficiency. Because the rough boring tool 32 has a relatively sharp tip, machining the retaining ring groove 132 would, on the one hand, result in low machining efficiency due to its structural characteristics; on the other hand, the sharp tip is prone to vibration during machining, making it difficult to ensure machining accuracy. The rough boring tool 32, however, has a larger tip, which not only allows it to complete machining the retaining ring groove 132 in one go but also reduces vibration during machining, effectively ensuring machining accuracy and meeting the requirements for efficient machining.

[0047] Preferably, the diameter of the first semi-finished hole is initially 64 mm, allowing the rough boring tool 32 to machine the diameter of the expansion hole 131 to 68.2 mm and then the diameter of the positioning hole 133 to 67 mm. After the expansion hole 131 and the positioning hole 133 are machined, the diameter of the composite tool 30 needs to be adjusted to 66.5 mm before moving to prevent the composite tool 30 from scratching the machined positioning hole 133 and expansion hole 131. After moving to the designated position, the slot expansion tool of the composite tool 30 machines the diameter of the retaining ring slot 132 to 74 mm, thus completing the machining of the expansion hole 131, the retaining ring slot 132, and the positioning hole 133.

[0048] This application uses a servo motor to control the feed motion and a conventional motor to drive the workpiece rotation to achieve hole machining on the transmission shaft flange fork 10. Equipped with two servo drive systems, each controlling two servo motors, it is used to precisely adjust the tool's extension, thereby facilitating the machining of the expansion hole 131, positioning hole 133, and retaining ring groove 132 of the transmission shaft flange fork 10.

[0049] Furthermore, step S20 includes steps S21 to S24. The method for processing the transmission shaft flange fork 10 sequentially performs steps S10, S21, S22, S23, S24, and S30. Steps S21 to S24 are described in detail below:

[0050] In step S21, with the flange fork 10 in a rotating state, the composite tool 30 is controlled to move along the second axis until the first tool spread is adjusted to the first radius. In this embodiment, the first radius is 34.1 mm, with a tolerance range of 0 mm to 0.2 mm. Therefore, certain machining accuracy requirements are imposed on the expansion hole 131, ensuring that the retaining spring is stably positioned within the retaining spring groove 132 while minimizing its deformation during assembly for ease of assembly. This provides an accurate dimensional reference for machining the expansion hole 131, ensuring that the diameter of the expansion hole 131 meets design requirements. The second axis is perpendicular to the first axis, the first tool spread is the distance the rough boring tool 32 deviates from the first axis, and the first radius is the radius of the expansion hole 131.

[0051] In step S22, based on the first flare amount being the first radius, the composite tool 30 is controlled to move along the first axis until the rough boring tool 32 forms the expanded hole 131. After the flare amount is determined, the composite tool 30 is moved along the first axis, so that the rotating flange fork 10 cooperates with the moving rough boring tool 32 to accurately machine the expanded hole 131, ensuring the axial dimensional accuracy of the expanded hole 131.

[0052] In step S23, upon completion of machining of expansion hole 131, the composite tool 30 is controlled to move along the second axis until the first spread is adjusted to a second radius. The second radius corresponds to the axis of positioning hole 133, i.e., the second radius is smaller than the first radius. The second radius is 33.5 mm, with a tolerance range of 0.035 mm to 0.065 mm. By further moving along the second axis and adjusting the spread to the radius of positioning hole 133, the dimensional transition from expansion hole 131 to positioning hole 133 is achieved, preparing for machining positioning hole 133.

[0053] In step S24, based on the first tool spread being the second radius, the composite tool 30 is controlled to move along the first axis until the rough boring tool 32 forms the positioning hole 133, completing the second semi-finished hole. Positioning hole 133 is then machined along the first axis using the adjusted tool spread, so that the expanded hole 131 and positioning hole 133 connect to form a stepped hole. By adjusting the tool spread and movement direction in steps, the structural and dimensional accuracy of the second semi-finished hole is ensured, further ensuring the stability of subsequent machining.

[0054] Furthermore, step S30 includes step S31 and step S32. The method for processing the transmission shaft flange fork 10 sequentially performs step S10, step S20, step S31, and step S32. Step S31 and step S32 are described in detail below:

[0055] In step S31, based on the completion of the processing of the second semi-finished hole, the composite tool 30 is controlled to move along the first axis until the grooving tool 33 is located at the preset grooving position of the second semi-finished hole, providing accurate axial positioning for the processing of the retaining ring groove 132, and ensuring that the retaining ring groove 132 is connected to the designed position between the expansion hole 131 and the positioning hole 133.

[0056] In step S32, based on the grooving cutter 33 being located at the preset grooving position, the composite tool 30 is controlled to move along the second axis until the second tool spread reaches the third radius, thereby machining and forming the retaining spring groove 132 and completing the machining of the third semi-finished hole. The second tool spread is the distance that the grooving cutter 33 deviates from the first axis, and the third radius is the radius of the retaining spring groove 132, which is 37 mm. Furthermore, the grooving cutter 33 has a larger blade head than the expanding cutter, which has a smaller diameter. This allows the retaining spring groove 132 to be machined in one go, improving machining efficiency. By adjusting the tool spread of the grooving cutter 33 along the second axis to the radius of the retaining spring groove 132, the grooving cutter 33 machines a retaining spring groove 132 that meets the dimensional requirements at the preset position, achieving one-time machining of the retaining spring groove 132, ensuring the dimensional accuracy of the retaining spring groove 132 and facilitating subsequent retaining spring installation.

[0057] Furthermore, before step S31 , the hole processing method of the transmission shaft flange fork 10 further includes step S33 , and the processing method of the transmission shaft flange fork 10 sequentially executes step S10 , step S20 , step S33 , step S31 , and step S32 .

[0058] In step S33, upon completion of machining the second semi-finished hole, the composite tool 30 is controlled to move along the second axis until the second tool spread is less than the radius of the positioning hole 133. After machining the second semi-finished hole, the tool shank 31 is inserted into the second semi-finished hole, and the corresponding lug 12 is located between the rough boring tool 32 and the grooving tool 33. By moving the composite tool 30 along the second axis before machining the retaining ring groove 132, such that the second tool spread is less than the radius of the positioning hole 133, interference between the grooving tool 33 and the inner wall of the second semi-finished hole during its movement along the first axis is avoided. Furthermore, the state in which the tool shank 31 is inserted into the second semi-finished hole and the lug 12 is located between the rough boring tool 32 and the grooving tool 33 provides stable structural support for the subsequent positioning and movement of the grooving tool 33, ensuring safety and accuracy during the grooving process.

[0059] In other embodiments, step S30 includes step S34, and the method for processing the transmission shaft flange fork 10 sequentially performs step S10, step S20, step S31, step S32, step S34, and step S40. Step S34 will be described in detail below:

[0060] In step S34, based on the second tool rollout being the third radius value, the composite tool 30 is controlled to remain stationary for a predetermined time period. This ensures that the grooving cutter 33 fully processes the retaining spring groove 132, ensuring the dimensional accuracy and surface quality of the retaining spring groove 132, and avoiding issues such as incomplete grooves or substandard accuracy due to insufficient machining time. Furthermore, it removes debris generated during machining within the retaining spring groove 132, preventing subsequent retaining springs from being accurately placed within the retaining spring groove 132 and reducing the time required to clean the retaining spring groove 132.

[0061] Furthermore, step S30 includes step S35 and step S36. The method for processing the transmission shaft flange fork 10 sequentially performs step S10, step S20, step S31, step S32, step S34, step S35, step S36, and step S40. Step S35 and step S36 are described in detail below:

[0062] In step S35, after the composite tool 30 has remained stationary for a predetermined period of time, the composite tool 30 is controlled to move along the second axis until the first tool spread is less than the radius of the positioning hole 133, and the second tool spread is less than the radius of the expansion hole 131. This prevents the tool from colliding with the hole wall during the disengagement process, protecting the processed expansion hole 131, positioning hole 133, retaining ring groove 132, and the tool. The first tool spread is the distance the rough boring tool 32 deviates from the first axis.

[0063] In step S36, based on the fact that the first spread amount is less than the radius of the positioning hole 133 and the second spread amount is less than the radius of the expansion hole 131, the composite cutting tool 30 is controlled to move along the first axis to disengage the composite cutting tool 30 from the flange fork 10. After ensuring that the tool spread meets the requirement that the second spread amount is less than the radius of the expansion hole 131, the composite cutting tool 30 is disengaged from the flange fork 10 by movement along the first axis, completing the machining process in an orderly manner, preventing damage to the machined structure caused by improper disengagement, and ensuring machining integrity.

[0064] Furthermore, when the grooving cutter 33 is at the preset grooving position, i.e., the stepped position of the second semi-finished product, the projection of the cutting edge width of the grooving cutter 33 along the second axis covers the junction between the expanded hole 131 and the positioning hole 133 in the second semi-finished product. This ensures that the grooving cutter 33 can produce a suitable retaining ring groove 132 at this junction in a single pass, ensuring the compatibility of the retaining ring groove 132 with the stepped hole structure, avoiding positional deviation of the retaining ring groove 132 due to insufficient cutting range, and further improving the machining accuracy and efficiency of the retaining ring groove 132. It also avoids sharp edges that could prevent the retaining ring from being accurately positioned during installation, ensuring a smooth transition between the first, second, and third semi-finished product holes.

[0065] Furthermore, the hole processing method of the transmission shaft flange fork 10 further includes step S40. The processing method of the transmission shaft flange fork 10 sequentially performs step S10, step S20, step S30, and step S40:

[0066] In step S40, upon completion of machining the third semi-finished hole, a fine boring tool is used to fine bore the third semi-finished hole to form bearing hole 13. This improves the precision and surface finish of bearing hole 13, ensures the precise fit between bearing hole 13 and the universal joint bearing, and provides a reliable structural foundation for subsequent stable assembly and efficient transmission of the universal joint.

[0067] Example 2:

[0068] In this embodiment, if Figure 2 、 Figure 3 、 Figure 4 As shown, the hole machining device of the transmission shaft flange fork 10 includes a machine tool assembly 20 and a composite tool 30 .

[0069] The machine tool assembly 20 includes a worktable 21, a clamping unit, a rough boring spindle 22, and a spreading head 23. The clamping unit is rotatably connected to the worktable 21 about a first axis, providing a rotational foundation for machining. The clamping unit is used to clamp the flange fork 10. The rough boring spindle 22 is slidably connected to the worktable 21 along a first axis, and the spreading head 23 is slidably connected to the rough boring spindle 22 along a second axis. The first and second axes are perpendicular, enabling the composite tool 30 to move in two perpendicular directions, meeting the position adjustment requirements of different machining steps and providing structural support and motion assurance for hole machining.

[0070] The composite tool 30 includes a tool holder 31, a rough boring tool 32, and a grooving tool 33. The tool holder 31 is parallel to the first axis. The rough boring tool 32 and the grooving tool 33 are respectively connected to the tool holder 31. Integrating the rough boring tool 32 and the grooving tool 33 on the same tool holder 31 can reduce the number of tool replacement and clamping times, thereby improving processing efficiency. The tool holder 31 is connected to the spreader head 23. The height of the rough boring tool 32 protruding from the tool holder 31 along the second axis is a first height, and the height of the grooving tool 33 protruding from the tool holder 31 along the second axis is a second height. The first height is less than the second height, ensuring that the grooving tool 33 does not interfere with the rough boring tool 32 during processing, and that the grooving tool 33 can accurately act on the target position during processing. The width of the cutting edge of the rough boring tool 32 along the first axis is a first width, and the width of the cutting edge of the grooving tool 33 along the second axis is a second width; the first width is less than the second width. It adapts to the different requirements of rough boring and grooving, ensures that the stepped hole formed by rough boring and the retaining ring groove 132 formed by grooving meet the size requirements, and improves the processing accuracy.

[0071] Furthermore, the machine tool assembly 20 also includes a fine boring spindle 24 and a sliding platform. The fine boring spindle 24 is slidably connected to the worktable 21 along a first axis, driving the fine boring tool to complete the fine boring of the third semi-finished hole, thereby improving the accuracy of the hole. The sliding platform is slidably connected to the worktable 21 along a third axis, enabling adjustment of the position of the clamping unit and the flange fork 10 along the third axis, increasing the flexibility of adjusting the processing position. The third axis is perpendicular to the first and second axes, respectively. The clamping unit and the sliding platform are rotationally connected about the first axis, ensuring the stability of the flange fork 10 during rotational processing. The multi-directional motion adjustment further enhances the adaptability of the device to different processing requirements.

[0072] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A method for machining a hole of a transmission shaft flange fork, characterized in that: The hole processing method of the transmission shaft flange fork includes: Upon completion of the flange fork clamping, the flange fork is controlled to rotate about a first axis; wherein the flange fork comprises an integrally formed flange body and two lugs; a first semi-finished hole is formed on the lug; and the first axis coincides with an axis of the first semi-finished hole; Based on the flange fork being in a rotating state, the composite tool is controlled to move so as to expand the first semi-finished hole to form a second semi-finished hole by a rough boring tool; wherein the composite tool includes a tool holder, a rough boring tool, and a slotting tool; the rough boring tool and the slotting tool are respectively connected to the tool holder; the second semi-finished hole includes an expansion hole and a positioning hole; the diameter of the expansion hole is larger than the diameter of the positioning hole; the expansion hole is connected to the positioning hole; and the diameter of the positioning hole is larger than the diameter of the first semi-finished hole; Based on the completion of the processing of the second semi-finished hole, the movement of the composite tool is controlled to process a retaining ring groove in the second semi-finished hole through a grooving tool to form a third semi-finished hole; the retaining ring groove is connected between the expansion hole and the positioning hole; the diameter of the retaining ring groove is larger than the diameter of the expansion hole.

2. A method for machining a hole of a transmission shaft flange fork according to claim 1, characterized in that: The method of controlling the composite tool to move based on the flange fork being in a rotating state, so as to expand the first semi-finished hole to form a second semi-finished hole by a rough boring tool, comprises: Based on the flange fork being in a rotating state, controlling the composite tool to move along the second axis until a first tool spread is adjusted to a first radius value; wherein the second axis is perpendicular to the first axis; the first tool spread is a distance that the rough boring tool deviates from the first axis; and the first radius is a radius of the expanded hole; Based on the first tool expansion amount being the first radius value, controlling the composite tool to move along the first axis until the rough boring tool forms the expanded hole; Based on the completion of the expansion hole processing, controlling the composite tool to move along the second axis until the first expansion amount is adjusted to a second radius value; wherein the second radius value is the axis of the positioning hole; Based on the first tool extension amount being the second radius value, the composite tool is controlled to move along the first axis until the rough boring tool forms the positioning hole and the second semi-finished hole is completed.

3. The method for machining a hole of a transmission shaft flange fork according to claim 1, characterized in that: The method of controlling the composite tool to move based on the completion of machining the second semi-finished hole to machine a retaining ring groove in the second semi-finished hole by a grooving cutter to form a third semi-finished hole comprises: Based on the completion of machining the second semi-finished hole, controlling the composite tool to move along the first axis until the grooving tool is located at a preset grooving position of the second semi-finished hole; Based on the grooving cutter being located at the preset grooving position, the composite tool is controlled to move along the second axis until the second tool extension amount is a third radius value, the retaining ring groove is processed and formed, and the third semi-finished hole is processed; wherein, the second tool extension amount is the distance that the grooving cutter deviates from the first axis; the third radius value is the radius of the retaining ring groove.

4. A method for machining a hole of a transmission shaft flange fork according to claim 3, characterized in that: After the second semi-finished hole is machined, the composite tool is controlled to move along the first axis until the grooving tool is located before the preset grooving position of the second semi-finished hole. The method for machining a hole of a transmission shaft flange fork further includes: Based on the completion of the processing of the second semi-finished hole, the composite tool is controlled to move along the second axis until the second tool spread is smaller than the radius of the positioning hole; when the processing of the second semi-finished hole is completed, the tool holder is passed through the second semi-finished hole, and the corresponding support ear is located between the rough boring tool and the grooving tool.

5. The method for machining a hole of a transmission shaft flange fork according to claim 3, characterized in that: The hole processing method of the transmission shaft flange fork also includes: Based on the second tool spread being the third radius value, the composite tool is controlled to remain stationary for a preset time period.

6. A method for machining a hole of a transmission shaft flange fork according to claim 5, characterized in that: The hole processing method of the transmission shaft flange fork also includes: Based on the composite tool remaining stationary for the preset time period, controlling the composite tool to move along the second axis until a first spread amount is smaller than a radius of the positioning hole and a second spread amount is smaller than a radius of the expansion hole; wherein the first spread amount is a distance that the rough boring tool deviates from the first axis; Based on the fact that the first spread amount is smaller than the radius of the positioning hole and the second spread amount is smaller than the radius of the expansion hole, the composite tool is controlled to move along the first axis to separate the composite tool from the flange fork.

7. The method for machining a hole of a transmission shaft flange fork according to claim 3, characterized in that: When the grooving cutter is located at the preset grooving position, the projection of the grooving cutter cutting edge width along the second axis covers the connecting portion between the expanded hole and the positioning hole in the second semi-finished hole.

8. The method for machining a hole of a transmission shaft flange fork according to claim 1, characterized in that: The hole processing method of the transmission shaft flange fork also includes: Based on the completion of machining of the third semi-finished hole, a fine boring tool is used to perform fine boring machining on the third semi-finished hole to form a bearing hole.

9. A hole machining device for a transmission shaft flange fork, applied to the hole machining method for a transmission shaft flange fork according to any one of claims 1 to 8, characterized in that: The hole processing device of the transmission shaft flange fork includes: A machine tool assembly, comprising a worktable, a clamping unit, a rough boring spindle, and a spreading head; the clamping unit is rotatably connected to the worktable about a first axis; the clamping unit is used to clamp a flange fork; the rough boring spindle is slidably connected to the worktable along the first axis; the spreading head is slidably connected to the rough boring spindle along a second axis; the first axis is perpendicular to the second axis; A composite tool, comprising a tool holder, a rough boring tool and a grooving tool; the tool holder is parallel to the first axis; the rough boring tool and the grooving tool are respectively connected to the tool holder; the tool holder is connected to the spreading head; the height of the rough boring tool protruding from the tool holder along the second axis is a first height; the height of the grooving tool protruding from the tool holder along the second axis is a second height; the first height is smaller than the second height; the width of the cutting edge of the rough boring tool along the first axis is a first width; the width of the cutting edge of the grooving tool along the second axis is a second width; the first width is smaller than the second width.

10. The hole machining device for a transmission shaft flange fork according to claim 9, characterized in that: The machine tool assembly also includes a precision boring spindle and a sliding platform; the precision boring spindle is slidingly connected to the worktable along the first axis; the sliding platform is slidingly connected to the worktable along the third axis; the third axis is perpendicular to the first axis and the second axis respectively; the clamping unit is rotationally connected to the sliding platform around the first axis.

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