A kind of final clamp post-calibration double-stage locking gear clamping device and method

Abstract

The application belongs to the technical field of gear machining clamps, in particular to a two-stage locking gear clamping device and method with post-clamping calibration, wherein an X moving platform and a Y moving platform are arranged on a mounting base and slide with each other perpendicularly, and a final clamping assembly is installed on the Y moving platform. Two moving platforms drive two locking rails on the corresponding clamping seat of the previous stage component. Two actual pressure heads of each stage are provided with verification holes, and a verification rod is inserted along the guide hole of the corresponding clamping seat to check the position of the two pressure heads. A fixed measuring support is fixed relative to the non-rotating part of the machine tool. After the workpiece is finally clamped, the clamping state is maintained for radial alignment, and then locking, verification and re-measurement after locking are performed in sequence. The structure combines final clamping maintenance, two-stage position adjustment and actual pressure head position verification.

Description

Technical Field

[0001] This invention relates to the field of gear machining clamping technology, specifically to a dual-stage locking gear clamping device and method for post-clamping calibration, which performs radial calibration after workpiece clamping and fixes the calibration position through a dual-stage locking structure set with the moving platform. Background Technology

[0002] In gear machining, the fit clearance between the workpiece's inner hole and the clamping part, the contact state of the supporting surface, and positional changes during clamping can cause the actual rotational position of the workpiece after clamping to differ from its initial positioning position. For workpieces that use the machined cylindrical surface as a rotational alignment reference, positional adjustment needs to be performed while maintaining the clamping state, and the position should be fixed after adjustment.

[0003] Chinese patent document CN105458419A discloses an automatic positioning gear processing device. This device uses a positioning rod on a positioning disc to clamp the gear, calculates the center position of the inner hole using pressure and stroke sensors, changes the gear's position via an adjustment table, and includes a locking mechanism for locking after alignment. The detection objects used in this solution are mainly the force and stroke of the positioning rod; it does not provide a structure where two actual pressure heads of the same level jointly define the mechanical verification channel.

[0004] Chinese patent document CN217702978U discloses a multi-station five-axis rotary shaft fixture for grinding. Its mounting plate moves along a guide rail, and guide rail clamps are arranged oppositely on both sides of the bottom of the mounting plate to fix its position. This structure allows the clamps to move with the mounting plate. When this type of table-mounted clamping structure is used for two-stage position adjustment, each clamping point still needs to be individually clamped; observing the position of the drive component alone cannot directly show whether the two actual pressure heads at the same stage are both within the specified position range.

[0005] In summary, the technical problem that urgently needs to be solved in this field is: while maintaining the final clamping state of the workpiece, adjusting and locking two mutually perpendicular movement directions respectively, so that the mechanical verification of each level directly corresponds to the two actual pressure heads of that level, and checking the radial position change after locking through a measurement reference independent of the movement of the table. Summary of the Invention

[0006] In view of this, the present invention provides a double-stage locking gear clamping device and method for final clamping and calibration, which sets up final clamping of workpiece, platform alignment, graded locking and actual pressure head position verification separately, and confirms the alignment position by retesting after locking.

[0007] To address the aforementioned problems, this invention provides a dual-stage locking gear clamping device for post-clamping calibration. The device includes a mounting base, an X-axis moving platform, a Y-axis moving platform, a final clamping assembly, a first locking assembly, and a second locking assembly. The X-axis moving platform is slidably mounted on the mounting base along the X direction, and the Y-axis moving platform is slidably mounted on the X-axis moving platform along the Y direction, which is perpendicular to the X direction. The final clamping assembly is mounted on the Y-axis moving platform and moves as a whole with the Y-axis moving platform. The clamping relationship established by the final clamping assembly on the workpiece remains unchanged during the adjustment of the two-stage moving platforms.

[0008] In the above scheme, the mounting base is further provided with a first locking rail and a second locking rail extending along the X direction. The first locking assembly includes a first clamping seat and a second clamping seat fixed to the X-moving platform, and a first pressure head and a second pressure head slidably disposed in the two clamping seats along the pressing direction. The lower pressure bearing part of the first clamping seat and the first pressure head are located on the lower and upper sides of the first locking rail, respectively; the lower pressure bearing part of the second clamping seat and the second pressure head are located on the lower and upper sides of the second locking rail, respectively. When the pressure head presses downward, the lower pressure bearing part of the corresponding clamping seat receives a reaction force, locking the relative sliding between the X-moving platform and the mounting base.

[0009] The X-moving platform is provided with a third locking rail and a fourth locking rail extending along the Y direction. The second locking assembly includes a third clamping seat and a fourth clamping seat fixed to the Y-moving platform, and a third pressure head and a fourth pressure head slidably disposed within the two clamping seats along the pressing direction. The lower pressure bearing portion of the third clamping seat and the third pressure head are located below and above the third locking rail, respectively; the lower pressure bearing portion of the fourth clamping seat and the fourth pressure head are located below and above the fourth locking rail, respectively. This locks the relative sliding between the Y-moving platform and the X-moving platform.

[0010] In the above scheme, furthermore, each of the four clamping seats is equipped with a clamping screw that drives the corresponding pressure head to move forward and backward along the clamping direction. Each of the four pressure heads is equipped with a verification hole. The first and second clamping seats are equipped with guide holes for the insertion of the first verification rod along the same path. When the first and second pressure heads press against their respective locking rails, their verification holes are aligned with this path. The third and fourth clamping seats are equipped with guide holes for the insertion of the second verification rod along the same path. When the third and fourth pressure heads press against their respective locking rails, their verification holes are aligned with this path. The verification rod passes directly through two actual pressure heads of the same level, and the verification reference moves together with the moving platform of that level. The length of the verification rod can sequentially pass through the two corresponding verification holes and guide holes, with its front end extending from the end guide hole to confirm complete passage.

[0011] The upper ends of the first, second, third, and fourth clamping seats are detachably fixed with a first cover plate, a second cover plate, a third cover plate, and a fourth cover plate, respectively. The first, second, third, and fourth clamping screws are threadedly connected to their respective cover plates, and their lower ends are rotatably connected to their respective pressure heads, limiting each other in the clamping direction. The traction flange at the lower end of each clamping screw is accommodated in the limiting cavity of the corresponding pressure head and is inserted through the assembly port on the side of the pressure head; after assembly, the outer side of this assembly port is blocked by the side wall of the corresponding clamping seat. The detachable cover plate provides a channel for inserting the pressure head from above, and the traction flange enables the pressure head to disengage from the locking rail when the clamping screw is rotated in the opposite direction.

[0012] In the above scheme, furthermore, the mounting base rotatably supports an X adjusting screw threadedly connected to the X moving platform, and the X moving platform rotatably supports a Y adjusting screw threadedly connected to the Y moving platform. The X adjusting screw is axially limited relative to the mounting base by its own shoulder and the X limiting nut; the Y adjusting screw is axially limited relative to the X moving platform by its own shoulder and the Y limiting nut. Each of the two limiting nuts is provided with a stop screw that abuts against the corresponding adjusting screw to restrict the rotation of the limiting nut relative to the adjusting screw.

[0013] In the above scheme, the final clamping assembly further includes a support ring and a central wedge fixed to the Y-moving platform, tensioning segments distributed circumferentially on the outer side of the central wedge, a common traction component continuously connected as a single entity, and a central tie rod. The outer inclined surface of the central wedge slides into contact with the inner inclined surface of the corresponding tensioning segment. The central tie rod passes through the central wedge and is circumferentially limited therewith, with its lower shoulder and traction nut clamping the common traction component from both the upper and lower sides. The T-shaped traction feet at the lower part of each tensioning segment slide within the radial T-groove of the common traction component and are axially limited by the groove wall. The common traction component transmits the axial movement of the central tie rod while allowing each tensioning segment to undergo corresponding radial movement.

[0014] In the above scheme, the outer inclined surface of the central wedge seat is provided with an oblique T-shaped guide key, and the inner side of the tensioning segment is provided with an oblique T-shaped guide groove that slides with it. The upper part of the central pull rod is threadedly connected to the drive sleeve. The lower side of the flange of the drive sleeve is supported on the central wedge seat by a lower thrust washer, and the upper side of the flange is axially limited by a pressure cap fixed on the central wedge seat by an upper thrust washer. The anti-rotation screw on the pressure cap can abut against the outer circumferential surface of the drive sleeve. When the drive sleeve rotates, the central pull rod, which is circumferentially limited, moves axially; when operating in the reverse direction, the oblique anti-disengagement guide fit and the radial traction fit together drive the tensioning segment to retract.

[0015] In the above scheme, the clamping device further includes a fixed measuring bracket, a telescopic rod, and a displacement measuring device. The fixed measuring bracket is fixed to the non-rotational bearing of the machine tool, and the telescopic rod is slidably mounted on the fixed measuring bracket and locked by the measuring bracket locking screw. The displacement measuring device is fixed on the telescopic rod, and its measuring rod switches between a measuring position in contact with the continuous reference cylindrical surface of the workpiece and a retracted position away from the workpiece as the telescopic rod moves.

[0016] The present invention also provides a clamping method for a staged double-stage locking gear clamping device with post-clamping calibration as described above, comprising the following steps:

[0017] S1. Position the gear workpiece on the final clamping assembly and complete the final clamping;

[0018] S2. Maintain the clamping state of the final clamping assembly on the gear workpiece, so that the first locking assembly and the second locking assembly are in the released state, move the measuring rod to the position of contacting the continuous reference cylindrical surface of the gear workpiece, obtain the radial runout by rotation measurement, and adjust the position of the X moving platform and the Y moving platform after stopping the rotation, and repeat the measurement and adjustment.

[0019] S3. After alignment, make the corresponding pressure heads of the first locking assembly and the second locking assembly press against the corresponding locking rails respectively. Then, insert the first verification rod and the second verification rod along the corresponding guide holes respectively, and confirm that the rod ends pass through the two verification holes of the same level in sequence and then protrude from the end guide hole to verify the position of the two pressure heads of the same level.

[0020] S4. Withdraw the first verification rod and the second verification rod, and rotate the continuous reference cylindrical surface again to measure it while maintaining the final clamp and two-stage locking. After locking and re-measuring to meet the processing requirements, move the measuring rod to the withdrawal position.

[0021] In the above scheme, further, in step S3, when the first verification rod or the second verification rod is blocked, the blocked verification rod is removed, the corresponding pressure head, locking rail and verification hole are checked, and after removing foreign objects or abnormal positions, it is re-locked and verified.

[0022] In step S4, when the retest after locking exceeds the predetermined radial runout limit, the clamping state of the final clamping assembly is maintained, the first-level lock that needs adjustment is released, the corresponding moving platform is adjusted, and then the locking, verification, and retesting are performed again.

[0023] Furthermore, in the above scheme, the clamping method also includes a part removal and resetting step after processing:

[0024] S5. After processing is completed and rotation stops, keep the measuring rod in the exit position, maintain the locking state of the first locking component and the second locking component, then release the clamping of the gear workpiece by the final clamping component and take out the gear workpiece.

[0025] S6. After cleaning the support parts, guide parts and verification holes, release the two-level locks and reset the X moving platform and the Y moving platform.

[0026] The beneficial effects of this invention are:

[0027] (1) The final clamping assembly is installed on the Y moving platform and is adjusted as a whole with the two-stage moving platform. After the workpiece is finally clamped, the clamping relationship between the workpiece and the final clamping assembly is maintained. Radial alignment is achieved by adjusting the position in the X and Y directions. There is no need to repeatedly loosen and re-clamp the workpiece for alignment, reducing positional changes caused by repeated clamping.

[0028] (2) The first locking component and the second locking component are respectively set with the corresponding moving platform and act on the two actual sliding pairs respectively. The pressure head of each level and the lower pressure bearing part of the corresponding clamping seat clamp the locking rail from the upper and lower sides. The pressing reaction force returns to the moving platform of that level through the clamping seat, so that the two moving directions can be adjusted and locked respectively. This makes it convenient to release the lock and readjust the level that needs to be adjusted when the limit is exceeded after locking.

[0029] (3) Each verification rod passes sequentially through the verification holes of the two actual pressure heads of the same level along the guide hole of the corresponding clamping seat, and its verification benchmark moves together with the corresponding moving platform. Under the condition that the pressure head and connecting parts are intact and the state of the holes and rods meets the usage requirements, the two pressure heads of the same level can be directly checked whether they are in the specified position range by checking whether the verification rod can pass through completely, without having to estimate the position of the pressure head based on the position of the remote drive end. This verification is used for position checking, does not replace clamping force checking, and is not used as an automatic processing permit or stop signal.

[0030] (4) The fixed measuring bracket is installed on the non-rotational bearing of the machine tool so that the radial measurement reference is independent of the movement of the table. Under the condition that the final clamping and two-stage locking remain unchanged, the continuous reference cylindrical surface of the workpiece is re-measured after locking to check the radial position change before and after locking; if the re-measurement exceeds the limit, the final clamping is maintained and the workpiece is returned to the corresponding adjustment stage for processing, so that the pressure head position verification and the workpiece radial position re-measurement correspond to their respective inspection objects.

[0031] (5) The continuous common traction component engages with the T-shaped traction feet of each tensioning segment through a radial T-slot, allowing the tensioning segment to move radially while transmitting axial traction. The oblique T-shaped engagement between the central wedge and the tensioning segment provides guidance and anti-disengagement constraint for movement along the inclined plane. During reverse operation, it drives the tensioning segment to retract inward, so that clamping and unclamping have corresponding driving and constraint relationships, making it easy to remove the workpiece axially after releasing the inner hole clamp.

[0032] A method for detecting timing gear engagement runout using the aforementioned crank-connecting rod mechanism includes the following steps:

[0033] S1. Before use, clean and inspect all contact points, and perform mechanical distance verification if necessary. Then remove the positioning pin and calibration block. Under the same positioning conditions, establish a working reference using a reference workpiece.

[0034] S2, after retraction, load the workpiece to be inspected and perform axial limiting, completing the drive and linkage connection. First restore the contact between the two reference rollers and the corresponding main journal, then restore the meshing of the standard gear and the timing gear.

[0035] S3. With the two reference rollers in contact, the two supports able to move and the measuring rod within its effective stroke, the workpiece is rotated at least one revolution in the same direction, and the relative displacement change of the two supports is recorded.

[0036] S4 calculates the difference between the maximum and minimum readings within one revolution to obtain the meshing runout relative to the two equivalent references of the main journal. Judgment should be based on workpiece inspection requirements, traceability of measurement values, and applicable error analysis.

[0037] S5: If loss of contact, obstruction of movement, or overtravel of the measuring rod occurs during measurement, stop reading. After troubleshooting and re-establishing the measurement conditions, perform a complete cycle of measurement.

[0038] S6. After the measurement is completed, retract in sequence, disconnect and remove the parts, clean and reset.

[0039] The beneficial effects of this invention are:

[0040] (1) Reducing the influence of the common displacement of the two journals on the meshing reading. Under the condition that the two rollers are arranged with equal arms, have the same wheel surface profile, and maintain effective contact, the middle support of the equalization beam moves with the average change of the contact position of the two journals. The reference frame moves with this support, and the displacement measuring body moves with the reference frame. The relative measurement between the two frames thus reduces the influence of the common displacement, provides a clear comparison benchmark for different workpieces and repeated measurements, and improves the comparability and reliability of the results.

[0041] (2) The journal reference follow-up and gear meshing follow-up are realized separately, which facilitates the loading and unloading of workpieces and the restoration of measurement conditions. Two-stage guides and separately set springs enable the two follow-up actions to be realized separately. The staged retraction first releases the gear contact and then opens the journal to provide space for loading and unloading the workpiece. The reverse operation first establishes the journal reference and then restores the gear meshing, which facilitates the restoration of measurement conditions in the same order.

[0042] (3) Facilitates verification of positioning and mechanical spacing, reducing misjudgments caused by invalid measurements. The axial stop helps to repeatedly determine the axial position of the workpiece. The positioning pin cooperates with the stop plate to allow mechanical spacing verification to be performed in the fully retracted holding position. The calibration block facilitates checking the relative spacing between the two frames. Re-establishing conditions and performing a complete measurement cycle after an anomaly can reduce misjudgments caused by invalid contact or incomplete records. These measures, combined with workpiece inspection requirements, traceability of measurement values, and error analysis, make measurement and judgment more reliable.

[0043] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0045] Figure 1 This is a schematic diagram of the overall structure of the clamping device.

[0046] Figure 2 This is an exploded diagram of the two-stage mobile platform and its guiding structure.

[0047] Figure 3 This is a partial cross-sectional view showing the first locking component engaging with the first locking rail and the second locking rail.

[0048] Figure 4 This is an exploded view of the first pressure head, the first clamping screw, and the first cover plate.

[0049] Figure 5 This is a partial cross-sectional view showing the cooperation between the second locking component and the third and fourth locking rails.

[0050] Figure 6 This is a partial sectional isometric view of the final clamping assembly.

[0051] Figure 7 An exploded diagram showing the assembly relationship between the central tie rod and the drive assembly.

[0052] Figure 8This is a partially exploded view of the oblique anti-detachment guide pair and the radial traction connection pair.

[0053] Figure 9 A schematic diagram illustrating the fit between a fixed measurement datum and a continuous reference cylindrical surface.

[0054] Figure 10 This is a schematic diagram showing the final clamp release and removal of the gear workpiece.

[0055] Figure 11 This is a partial cross-sectional view of the first verification rod and the verification hole.

[0056] Figure 12 This is a partially exploded cross-sectional view of the axial positioning structure of the X-adjusting screw.

[0057] Figure 13 This is a partially exploded cross-sectional view of the axial positioning structure of the Y-adjusting screw.

[0058] Figure 14 This is an isometric drawing showing the main components of the clamping device.

[0059] Reference numerals: 100, Mounting base; 110, X guide rail; 112, X limit block; 120, First locking rail; 121, Second locking rail; 200, X moving platform; 210, X adjusting screw; 211, X limit nut; 213, X stop screw; 220, First locking assembly; 222, First clamping seat; 223, Second clamping seat; 224, Verification hole; 226, First pressure head; 227, Second pressure head; 228, First pressure... 229. Second clamping screw; 230. Traction flange; 231. Assembly port; 232. First cover plate; 233. Second cover plate; 250. First verification rod; 300. Y-moving platform; 310. Y-guide rail; 312. Y-limiting block; 320. Third locking rail; 321. Fourth locking rail; 330. Y-adjusting screw; 331. Y-limiting nut; 333. Y-stop screw; 340. Second locking assembly; 342. Third clamp 343. Holder; 346. Fourth clamping seat; 347. Third pressure head; 348. Fourth pressure head; 349. Third clamping screw; 352. Fourth clamping screw; 353. Third cover plate; 354. Fourth cover plate; 370. Second verification rod; 400. Final clamping assembly; 410. Support ring; 420. Central wedge seat; 421. Angled T-shaped guide key; 430. Tensioning segment; 431. Angled T-shaped guide groove; 434. T-shaped traction foot; 435. Common Traction component; 436, Radial T-slot; 450, Central tie rod; 451, Traction nut; 452, Drive sleeve; 453, Lower thrust washer; 454, Pressure cap; 455, Upper thrust washer; 456, Anti-rotation screw; 457, Fixing screw; 600, Fixed measuring bracket; 610, Telescopic rod; 620, Displacement measuring device; 621, Measuring rod; 623, Measuring bracket locking screw; 900, Gear workpiece; 901, Continuous reference cylindrical surface. Detailed Implementation

[0060] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0061] The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting this patent. To better illustrate the embodiments of the invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed, unless otherwise specified.

[0062] like Figures 1 to 14 As shown, this invention provides a double-stage locking gear clamping device and method for post-clamping calibration. All standard parts used in the following embodiments are commercially available. Functional descriptions not detailed in detail employ mature existing technologies, such as the assembly relationships between components and descriptions of related program control schemes. Irregularly shaped parts can be custom-made according to the specifications and drawings. All parts involved use conventional models found in the prior art and will not be detailed here. Content not described in detail in this specification is prior art known to those skilled in the art.

[0063] In the following embodiments, such as Figure 1 , Figure 2 and Figure 9 As shown, the mounting base 100 is used to fix the machine tool to its rotating working part. The X-moving platform 200 is mounted on the mounting base 100, the Y-moving platform 300 is mounted on the X-moving platform 200, and the final clamping assembly 400 is mounted on the Y-moving platform 300. The X and Y directions are perpendicular to each other and both lie in a plane perpendicular to the machine tool's rotation axis. Hereinafter, the direction parallel to this rotation axis is considered the axial direction, and the direction away from the mounting base 100 is considered upward.

[0064] The gear workpiece 900 has a through hole for internal clamping, an end face for axial support, and a continuous reference cylindrical surface 901 that can be contacted by the measuring rod 621. The continuous reference cylindrical surface 901 is located in a continuous cylindrical portion beside the tooth, and its circumferential direction is not interrupted by the tooth groove. In this structure, the contact measurement does not directly replace the continuous reference cylindrical surface 901 with a discontinuous tooth tip surface.

[0065] In specific implementation, such as Figures 1 to 14As shown, two X-guide rails 110 on the mounting base 100 are arranged parallel to each other along the X direction. The X-moving platform 200 has a T-shaped guide groove on its underside that mates with the X-guide rails 110. Two Y-guide rails 310 on the X-moving platform 200 are arranged parallel to each other along the Y direction, and the Y-moving platform 300 has a T-shaped guide groove on its underside that mates with the Y-guide rails 310. The two-stage T-shaped fit respectively restricts the lateral offset and disengagement of the moving platform, while retaining translation in the corresponding direction. The guide fit has a sliding clearance, and the load after locking is borne jointly by the guide contact and the locking contact. The guide rails, locking rails, and clamping seats in the illustrated structure are integrally formed with their respective load-bearing platforms, and the reference numerals indicate their corresponding structural parts.

[0066] like Figure 12 As shown, the X adjusting screw 210 passes through the support hole on the mounting base 100 and mates with the threaded hole on the X moving platform 200. An integral shoulder of the X adjusting screw 210 and a detachable X limiting nut 211 are located on either side of the support hole, restricting axial movement of the X adjusting screw 210. The X stop screw 213 is screwed radially into the X limiting nut 211 and abuts against the outer circumferential surface of the X adjusting screw 210. When the X adjusting screw 210 is rotated, the X moving platform 200 moves along the X guide rail 110.

[0067] like Figure 13 As shown, the Y-adjusting screw 330 passes through a support hole on the X-moving platform 200 and mates with a threaded hole on the Y-moving platform 300. An integral shoulder of the Y-adjusting screw 330 and a Y-limiting nut 331 are located on either side of the support hole, and a Y-stop screw 333 radially abuts against the Y-adjusting screw 330. The Y-adjusting screw 330 moves along the X direction together with the X-moving platform 200 and independently drives the Y-moving platform 300 to move along the Y direction. The operating ends of both adjusting screws are located on the outer sides of their respective moving platforms.

[0068] Two X-limiting blocks 112 are detachably fixed to the mounting base 100 and located outside the range of motion at both ends of the X-moving platform 200. Two Y-limiting blocks 312 are detachably fixed to the X-moving platform 200 and located outside the range of motion at both ends of the Y-moving platform 300. The inner surface of the limiting blocks abuts against the corresponding moving platform at the end of the travel stroke. The guide groove is first inserted from the open end of the guide rail, and then the limiting blocks are installed to avoid confining the moving platform between guide rails that cannot be inserted.

[0069] like Figure 3As shown, the first locking rail 120 and the second locking rail 121 are fixed to the mounting base 100 and extend along the X direction. Both locking rails have an upper flange and a connecting neck located below the flange. The first clamping seat 222 and the second clamping seat 223 are fixed to the same side of the X-moving platform 200 and are arranged at intervals along the Y direction. The opening of each clamping seat accommodates the corresponding locking rail, the lower pressure bearing part of the clamping seat extends to the lower side of the corresponding flange, and the connecting neck is located in the lower opening of the clamping seat.

[0070] The first pressure head 226 and the second pressure head 227 move within the vertical guide cavities of the first clamping seat 222 and the second clamping seat 223, respectively. The lower surfaces of the two pressure heads face the upper surfaces of the flanges of the first locking rail 120 and the second locking rail 121, respectively. When the pressure heads move downward and press against the flanges, the lower surfaces of the flanges transmit a reaction force to the lower pressure bearing portion of the clamping seat. The fixed connection between the clamping seat and the X-moving platform 200 allows the clamping reaction force to return to the X-moving platform 200, thereby establishing locking contact at two interval positions.

[0071] The first cover plate 232 is mounted on the upper end of the first clamping seat 222 by fixing screws 457, and the second cover plate 233 is mounted on the upper end of the second clamping seat 223 in the same manner. The first clamping screw 228 mates with the threaded hole of the first cover plate 232, and the second clamping screw 229 mates with the threaded hole of the second cover plate 233. When the corresponding clamping screw is rotated, the clamping screw moves axially forward and backward relative to the cover plate. The cover plate simultaneously closes the upper insertion channel of the pressure head.

[0072] In the above embodiments, further: as Figure 4 As shown, the lower end of the first clamping screw 228 is provided with a traction flange 230, and the upper part of the first pressure head 226 is provided with a limiting cavity. The limiting cavity communicates with the side surface of the first pressure head 226 through the assembly port 231. The assembly port 231 includes a wider portion for the traction flange 230 to pass through and an upper opening for the connecting rod segment to pass through. First, the traction flange 230 and the connecting rod segment are installed from the side, then the first pressure head 226 is placed into the guide cavity from above the first clamping seat 222, and finally the first cover plate 232 is installed.

[0073] The traction flange 230 can rotate relative to the first pressure head 226 within the limiting cavity, with its upper and lower end faces respectively limited by the upper and lower cavity walls of the limiting cavity. When the first clamping screw 228 is screwed downwards, it pushes the first pressure head 226; when it is screwed upwards, the traction flange 230 drives the first pressure head 226 away from the first locking rail 120. The side wall of the first clamping seat 222 blocks the assembly opening 231 to prevent the traction flange 230 from retracting laterally. The second pressure head 227 and the second clamping screw 229 are connected in the same way.

[0074] The first verification rod 250 is inserted along the Y-direction into the guide holes on the first clamping seat 222 and the second clamping seat 223. The first pressure head 226 and the second pressure head 227 each have a verification hole 224, the axes of which are parallel to the insertion direction of the first verification rod 250. With the two pressure heads pressing against the corresponding locking rails at their designed positions, the two verification holes 224 are coaxial with the guide holes of the two clamping seats. The first verification rod 250 passes sequentially through these guide holes and verification holes 224, directly checking the positional fit of the two pressure heads. The length of the verification rod should allow its front end to extend from the end guide hole to distinguish between complete passage and only entry into the previous hole.

[0075] In the above embodiments, further: as Figure 5 As shown, the third locking rail 320 and the fourth locking rail 321 are fixed to the X-moving platform 200 and extend along the Y direction. The third clamping seat 342 and the fourth clamping seat 343 are fixed to the Y-moving platform 300 and are spaced apart along the X direction. The third pressure head 346 and the lower pressure bearing portion of the third clamping seat 342 clamp the flange of the third locking rail 320, and the fourth pressure head 347 and the lower pressure bearing portion of the fourth clamping seat 343 clamp the flange of the fourth locking rail 321. The clamping reaction force of the second locking assembly 340 is returned to the Y-moving platform 300, and locking contact is established between the Y-moving platform 300 and the X-moving platform 200.

[0076] The third cover plate 352 and the fourth cover plate 353 are respectively fixed to the upper ends of the third clamping seat 342 and the fourth clamping seat 343 by fixing screws 457. The third clamping screw 348 is threaded to the third cover plate 352, and the fourth clamping screw 349 is threaded to the fourth cover plate 353. The two clamping screws are connected to the corresponding pressure heads through their respective traction flanges 230. The third pressure head 346 and the fourth pressure head 347 also have assembly ports 231, and the assembly sequence is to install the pressure head first and then fix the cover plate.

[0077] The second verification rod 370 passes sequentially along the X direction through the guide hole of the third clamping seat 342, the verification hole 224 of the third pressure head 346, the verification hole 224 of the fourth pressure head 347, and the guide hole of the fourth clamping seat 343. The two verification rods are at different heights and move with their corresponding clamping seats. The verification reference of the first verification rod 250 belongs to the X-moving platform 200, and the verification reference of the second verification rod 370 belongs to the Y-moving platform 300; neither requires a long-distance traction chain between the two moving platforms.

[0078] An insertion gap must be maintained between the verification hole 224 and the verification rod. If the offset of the indenter relative to the guide hole exceeds the allowable range of this gap, the verification rod will be blocked by the hole wall; if the offset is within the gap range, the verification rod may still pass through. Therefore, locking should be completed according to the clamping conditions required for the machining load before position verification. The passage of the verification rod only indicates that the indenter is in the corresponding position range; it is not used to measure clamping force, nor does it directly trigger machining permission or shutdown of the machine tool. Even if the indenter is missing or the hole diameter is enlarged due to wear, the verification rod may still pass through; therefore, the integrity of the indenter and connecting parts, as well as the hole diameter condition, should be checked before use.

[0079] In the above embodiments, further: as Figure 6 and Figure 8 As shown, the support ring 410 is fixed to the Y-moving platform 300, and its upper surface supports the lower end face of the gear workpiece 900. The central wedge 420 is fixed to the Y-moving platform 300 by a lower support and fixing screws 457. Four tensioning segments 430 are distributed circumferentially along the central wedge 420, and their outer arc surfaces are used to abut against the inner wall of the gear workpiece 900. The lower part of the outer inclined surface of the central wedge 420 protrudes outward and the upper part contracts inward, and the inner inclined surface of each tensioning segment 430 cooperates with it.

[0080] The common traction component 435 is located below the central wedge seat 420 and inside the support ring 410. The common traction component 435 is a single part with a continuous annular connection. Each support column of the central wedge seat 420 passes through a clearance hole on the common traction component 435, with a clearance between the clearance hole and the support column sufficient for axial movement. The common traction component 435 has four radially open T-slots 436, and the T-shaped traction feet 434 at the lower part of each tensioning segment 430 are respectively inserted into the corresponding radially open T-slot 436 from the outer end.

[0081] The lateral expansion of the T-shaped traction foot 434 is axially limited by the upper shoulder and lower wall of the radial T-groove 436, with its neck passing through the groove opening. When the common traction member 435 moves axially, it transmits the axial force to each tensioning segment 430; when the tensioning segment 430 moves radially along the inclined plane, the T-shaped traction foot 434 slides accordingly within the radial T-groove 436. Therefore, the common traction member 435 simultaneously undertakes common traction and radial movement clearance.

[0082] Each inclined surface of the central wedge seat 420 is provided with an inclined T-shaped guide key 421, and the inner side of the corresponding tensioning segment 430 is provided with an inclined T-shaped guide groove 431. The two slide in engagement along the inclined direction of the inclined surface and limit each other in the direction perpendicular to the inclined surface. When the common traction member 435 moves upward, this engagement causes the tensioning segment 430 to move upward and inward along the inclined surface, driving its outer arc surface away from the inner wall of the workpiece hole; when moving downward, the tensioning segment 430 moves downward and outward along the inclined surface. This reverse retraction has a practical anti-detachment guiding constraint.

[0083] In the above embodiments, further: as Figure 7 As shown, the central tie rod 450 passes through the common traction member 435 and the central wedge seat 420. The lower shoulder of the central tie rod 450 abuts against the upper side of the common traction member 435, and the traction nut 451 is threaded onto the lower end of the central tie rod 450 and abuts against the lower side of the common traction member 435. The square section in the middle of the central tie rod 450 mates with the square guide hole in the central wedge seat 420, allowing the central tie rod 450 to move axially and restricting its rotation.

[0084] The upper threaded section of the central tie rod 450 mates with the drive sleeve 452. The lower flange of the drive sleeve 452 is located between the lower thrust washer 453 and the upper thrust washer 455. The lower thrust washer 453 is supported on the upper platform of the central wedge seat 420, and the upper side of the upper thrust washer 455 is limited by the pressure cap 454, which is fixed to the central wedge seat 420 by fixing screws 457. The drive sleeve 452 rotates relative to the central wedge seat 420 while maintaining its axial position, and the central tie rod 450 moves axially with the rotation of the drive sleeve 452.

[0085] The center hole of the pressure cap 454 and the inner hole of the upper thrust washer 455 can both be fitted onto the upper end of the drive sleeve 452. The dimensions of the operating part of the drive sleeve 452 do not hinder the assembly of these two parts. The anti-rotation screw 456 is screwed radially into the pressure cap 454 from the side, and its end can abut against the outer circumferential surface of the drive sleeve 452. Before rotating the drive sleeve 452, the anti-rotation screw 456 is loosened, and after final clamping, the anti-rotation screw 456 is brought into contact with the drive sleeve 452.

[0086] During the assembly of the final clamp assembly 400, the central tie rod 450 is first connected to the common traction member 435, and the traction nut 451 is installed. Four T-shaped traction feet 434 are inserted from the outer ends of the radial T-slots 436, placing each tensioning segment 430 in a relatively outwardly displaced position. The central wedge 420 is inserted from above, with the oblique T-shaped guide key 421 entering from the open end of the oblique T-shaped guide slot 431, simultaneously moving each tensioning segment 430 inward along the radial T-slots 436 until the support of the central wedge 420 reaches its installation position. The central wedge 420 is then fixed, and the thrust washer, drive sleeve 452, pressure cap 454, and anti-rotation screw 456 are installed. Disassembly is performed in reverse order, without forcing the continuous common traction member 435 through the solid portion of the central wedge 420.

[0087] The gear workpiece 900 is placed axially on the support ring 410. The drive sleeve 452 drives the central tie rod 450 and the common traction member 435 to move downwards, and each tensioning segment 430 moves outwards along the inclined plane and abuts against the inner hole of the workpiece. The support ring 410 defines the axial support position of the workpiece, and the tensioning segments 430 establish inner hole clamping. The axial disengagement action and torque generated by machining are borne by the established clamping friction and related supports. The required preload should be determined based on the workpiece, machining load, and contact conditions, and should not be replaced by the passage state of the verification rod.

[0088] In the above embodiments, further: as Figure 9 As shown, the fixed measuring bracket 600 is installed on the non-rotational bearing part of the machine tool, while the mounting base 100 is installed on the rotational working part of the machine tool. They belong to different mounting references. The telescopic rod 610 passes through the sliding guide opening at the upper part of the fixed measuring bracket 600, and the measuring bracket locking screw 623 presses against the telescopic rod 610 from the side. The displacement measuring device 620 is installed at the front end of the telescopic rod 610 by a fixing screw 457, and the measuring rod 621 extends in a direction close to the workpiece axis.

[0089] During measurement, loosen the locking screw 623 of the measuring bracket, move the telescopic rod 610 towards the workpiece, so that the spherical contact end of the measuring rod 621 abuts against the continuous reference cylindrical surface 901, and the displacement measuring device 620 is within its readable stroke range. Then lock the telescopic rod 610. When the workpiece rotates, the fixed measuring bracket 600, telescopic rod 610, and displacement measuring device 620 maintain their positions relative to the non-rotational support of the machine tool, and the measuring rod 621 extends and retracts with the radial position change of the reference surface. After measurement, move the telescopic rod 610 out in the opposite direction and lock it. The effective stroke of the displacement measuring device 620 should cover the change in reading caused by the initial eccentricity of the workpiece, with allowance for adjustment; the attached diagram shows its external mounting and the fitting relationship of the measuring rod.

[0090] In one set of structural dimension embodiments, the two moving platforms each have an adjustment range of ±4mm from the center position; the X adjusting screw 210 and Y adjusting screw 330 use threads with a nominal diameter of 12mm and a pitch of 1mm. The verification rod has a diameter of 6mm, and the verification hole 224 and the corresponding guide hole have a diameter of 6.4mm. Under ideal coaxial conditions, the radial insertion clearance on one side is 0.2mm. This clearance is used for manual insertion and position range verification and does not constitute a locking accuracy indicator.

[0091] In the same dimensional embodiment, the inclined surface of the central wedge 420 has a radial variation of 4mm within an axial length of 18mm. When the common traction member 435 moves upward by 1.8mm, the corresponding tensioning segment 430 moves inward by 0.4mm. The outer diameter of the common traction member 435 is 96mm, and the inner diameter of the support ring 410 is 98mm. The upper surface height of the support ring 410 is 94mm, the inner diameter of the workpiece embodiment is 96mm, the diameter of the continuous reference cylindrical surface 901 is 140mm, and the axial width is 6mm. The measuring rod 621 contacts within this width range. The above dimensions are used to illustrate a set of mutually cooperating structural relationships; other specifications should maintain corresponding movement, contact, and avoidance relationships.

[0092] Before use, ensure that the mounting base 100 and the fixed measuring bracket 600 are fixed to their respective machine tool locations. Check all fixing screws 457, axial limit of the adjusting screw, guide rail, limit block, and final clamp connection. Clean the support ring 410, tensioning segment 430, continuous reference cylindrical surface 901, and verification hole 224. The verification rod should be clean and free from bending that could affect insertion. Check the zeroing and indication of the displacement measuring device 620 according to its usage requirements, and confirm the measurement direction and contact stroke using appropriate standard parts.

[0093] The clamping method of the on-board double-stage locking gear clamping device for final clamping calibration described in the above embodiments is as follows:

[0094] S1. Positioning and Final Clamping. During assembly, keep the measuring rod 621 out of the machine. First, loosen the anti-rotation screw 456, then rotate the drive sleeve 452 to move the common traction component 435 upward and retract the tensioning segments 430 inward. Insert the gear workpiece 900 axially, ensuring its end face aligns with the support ring 410. Rotate the drive sleeve 452 in the opposite direction to make each tensioning segment 430 abut against the inner hole outward, establishing the final clamping preload required for machining. Then tighten the anti-rotation screw 456. Check if the support surfaces are completely aligned; if the alignment is abnormal, release the final clamp, clean, and reassemble the workpiece.

[0095] S2. Radial Alignment. Before radial alignment, retract the first verification rod 250 and the second verification rod 370, and rotate the four clamping screws in opposite directions to disengage the four pressure heads from their corresponding locking rails. Move the measuring rod 621 to the continuous reference cylindrical surface 901 and fix the telescopic rod 610. Rotate the rod one revolution at low speed or manually using the machine tool's allowable measurement method, and record the change in reading and the corresponding angular position. After stopping the rotation, adjust the X adjusting screw 210 and the Y adjusting screw 330, and rotate the rod again for measurement. Each adjustment is performed while the machine is stopped, and the adjusting handles provided with the rotating components are not operated during the measurement process.

[0096] In step S2, the radial eccentricity is gradually reduced based on the orientation and value changes of the reference surface's high point. When eliminating the influence of thread backlash, the final adjustment in the same direction can approach the target position from the same side. Throughout the alignment process, the final clamping preload is maintained, and X and Y adjustments are not obtained by loosening the workpiece. X and Y translations change the radial position but not the inclination direction of the workpiece's support surface; abnormal support fit or end-face posture should be returned to the assembly stage for processing.

[0097] S3. Stage locking and pressure head position verification. After alignment, stop rotation. First, make the first pressure head 226 and the second pressure head 227 press against the first locking rail 120 and the second locking rail 121 respectively, then make the third pressure head 346 and the fourth pressure head 347 press against the third locking rail 320 and the fourth locking rail 321 respectively. After each clamping point is pre-tightened according to the required clamping conditions, insert the first verification rod 250 and the second verification rod 370 respectively. During verification, use normal manual insertion force and confirm that the front end of the verification rod extends from the end guide hole. Do not consider entering only the previous hole as a passing result, and do not knock or use force-applying components to forcibly penetrate the hole.

[0098] In step S3, if the verification rod is obstructed, first remove the verification rod, then check the guide hole of the corresponding clamping seat, the verification hole 224 on the pressure head, the pressure surface of the pressure head, and the contact surface of the locking rail. After removing foreign objects or correcting the position of the pressure head, re-tighten and verify. Wear at the orifice, bending of the verification rod, or jamming of the pressure head should be eliminated first. Abnormalities cannot be covered up by enlarging the verification hole 224 or reducing the diameter of the verification rod.

[0099] S4. Re-measurement after locking and probe withdrawal. After the two-stage position verification is completed, withdraw the two verification probes and move them out of the rotation range. Re-rotate and measure in the final clamp and two-stage locking state to check the radial runout after locking. If it meets the requirements of this processing, stop the rotation, retract probe 621 to the withdrawn position and lock telescopic rod 610.

[0100] In step S4, if the post-lock retest exceeds the predetermined radial runout limit, stop the rotation, maintain the final clamp, release the first-level lock that needs adjustment, and readjust the corresponding moving platform. After adjustment, the locking, position verification, and post-lock retest must be performed again. If the inspection finds foreign objects between the workpiece and the support ring 410, insufficient support, or that the workpiece has slipped relative to the tensioned segment 430, return to the assembly stage; do not simply continue to increase the X and Y adjustment amounts.

[0101] After completing step S4, reconfirm that the measuring components, workpiece, fixture, and machining range are in good condition, and then proceed with machining according to the machine tool's established operating procedure.

[0102] If abnormal readings, sounds, vibrations, or clamping conditions occur during machining, stop machining and handle the issue according to the machine tool's own safety operating procedures. The two verification rods are only used for position checks when the machine is stopped and do not remain in the verification channel during machining. This structure does not automatically revoke machining permission by inserting or removing the verification rods.

[0103] S5. After machining is completed, release the final clamp and remove the part. For example... Figure 10 As shown, after machining is completed and rotation stops, keep the measuring rod 621 retracted and temporarily maintain a two-stage lock. Loosen the anti-rotation screw 456, rotate the drive sleeve 452 in the reverse direction, and the central tie rod 450 and the common traction component 435 move upward. The oblique T-shaped guide pair drives each tensioning segment 430 to retract inward. After confirming that the inner hole clamping is released, remove the gear workpiece 900 axially.

[0104] S6. Cleaning and Resetting. Clean the support ring 410, guide parts and verification hole 224, remove and store the verification rod, release the two-stage lock, and reset the two-stage moving platform.

[0105] The reaction force and motion relationships described in the above embodiments remain consistent across different specifications. The machining load, thread preload, clamping friction, part strength, and machine tool speed range should be matched to the specific workpiece and machine tool; their selection does not change the working relationship where the verification rod only checks the actual pressure head position range and the radial position still needs to be measured after locking.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double-stage locking gear clamping device for final clamping and calibration, characterized in that, The system includes a mounting base (100), an X-moving platform (200), a Y-moving platform (300), a final clamping assembly (400), a first locking assembly (220), and a second locking assembly (340). The X-moving platform (200) is slidably mounted on the mounting base (100) along the X direction, and the Y-moving platform (300) is slidably mounted on the X-moving platform (200) along the Y direction perpendicular to the X direction. The final clamping assembly (400) is mounted on the Y-moving platform (300) and moves as a whole with the Y-moving platform (300). The final clamping assembly (400) maintains a clamping state on the gear workpiece (900) during the adjustment of the two-stage moving platform. The mounting base (100) is provided with a first locking rail (120) and a second locking rail (121) extending in the X direction; the first locking assembly (220) includes a first clamping seat (222) and a second clamping seat (223) fixed on the X moving platform (200), and a first pressure head (226) and a second pressure head (227) slidably disposed in the first clamping seat (222) and the second clamping seat (223) respectively in the pressing direction; the lower pressure bearing part of the first clamping seat (222) and the first pressure head (226) are respectively disposed on the lower side and the upper side of the first locking rail (120), and the lower pressure bearing part of the second clamping seat (223) and the second pressure head (227) are respectively disposed on the lower side and the upper side of the second locking rail (121); The X-moving platform (200) is provided with a third locking rail (320) and a fourth locking rail (321) extending along the Y direction; the second locking assembly (340) includes a third clamping seat (342) and a fourth clamping seat (343) fixed on the Y-moving platform (300), and a third pressure head (346) and a fourth pressure head (347) slidably disposed in the third clamping seat (342) and the fourth clamping seat (343) respectively along the pressing direction; the lower pressure bearing part of the third clamping seat (342) and the third pressure head (346) are respectively disposed on the lower side and the upper side of the third locking rail (320), and the lower pressure bearing part of the fourth clamping seat (343) and the fourth pressure head (347) are respectively disposed on the lower side and the upper side of the fourth locking rail (321); The four clamping seats respectively support a first clamping screw (228), a second clamping screw (229), a third clamping screw (348), and a fourth clamping screw (349). The four clamping screws drive the corresponding pressure head to move forward and backward along the clamping direction via threaded supports on the corresponding clamping seats. Each of the four pressure heads is provided with a verification hole (224). The first clamping seat (222) and the second clamping seat (223) are provided with guide holes for the first verification rod (250) to be inserted along the same path. The first pressure head (226) and the second pressure head (229) are also provided with guide holes. 227) When the corresponding locking rails are pressed respectively, the verification holes (224) of both are aligned with the path; the third clamping seat (342) and the fourth clamping seat (343) are provided with guide holes for the second verification rod (370) to be inserted along the same path. When the third pressure head (346) and the fourth pressure head (347) press the corresponding locking rails respectively, the verification holes (224) of both are aligned with the path; the first verification rod (250) and the second verification rod (370) have lengths that can pass through the corresponding two verification holes (224) and guide holes in sequence.

2. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 1, characterized in that, The upper ends of the first clamping seat (222), the second clamping seat (223), the third clamping seat (342), and the fourth clamping seat (343) are respectively detachably fixed with the first cover plate (232), the second cover plate (233), the third cover plate (352), and the fourth cover plate (353); the first clamping screw (228), the second clamping screw (229), the third clamping screw (348), and the fourth clamping screw (349) are respectively threaded to the above four cover plates, and the lower ends of the above four clamping screws are respectively rotatably connected to the corresponding pressure head and mutually limit each other in the clamping direction.

3. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 2, characterized in that, The lower ends of the four clamping screws are respectively provided with traction flanges (230), and the four pressure heads are respectively provided with limiting cavities for accommodating the traction flanges (230) and assembly ports (231) connecting the limiting cavities and the side surfaces; the assembly ports (231) allow the traction flanges (230) and the rod segments connected to them to be inserted from the side, the upper and lower end faces of the traction flanges (230) are respectively axially limited with the corresponding cavity walls of the limiting cavities, and the outside of the assembly ports (231) is blocked by the side walls of the corresponding clamping seats.

4. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 1, characterized in that, The mounting base (100) is rotatably supported by an X adjusting screw (210) threadedly connected to the X moving platform (200), and the X moving platform (200) is rotatably supported by a Y adjusting screw (330) threadedly connected to the Y moving platform (300). The X adjusting screw (210) is axially limited relative to the mounting base (100) by its own shoulder and an X limiting nut (211) threadedly connected thereto, and the Y adjusting screw (330) is axially limited relative to the X moving platform (200) by its own shoulder and a Y limiting nut (331) threaded thereto. The X limiting nut (211) is provided with an X stop screw (213) abutting against the X adjusting screw (210), and the Y limiting nut (331) is provided with a Y stop screw (333) abutting against the Y adjusting screw (330).

5. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 1, characterized in that, The final clamping assembly (400) includes a support ring (410) and a central wedge (420) fixed to the Y-moving platform (300), tensioning segments (430) distributed circumferentially on the outer side of the central wedge (420), a common traction member (435) continuously connected as a single entity, and a central tie rod (450); the outer inclined surface of the central wedge (420) slides in engagement with the inner inclined surface of the corresponding tensioning segment (430), and the central tie rod... (450) is inserted into the central wedge (420) and circumferentially limited thereto. The lower shoulder of the central tie rod (450) and the traction nut (451) clamp the common traction member (435) from the upper and lower sides respectively. The T-shaped traction feet (434) at the lower part of the tensioning segment (430) are slidably disposed in the radial T-shaped groove (436) on the common traction member (435) and axially limited with the groove wall of the radial T-shaped groove (436).

6. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 5, characterized in that, The outer inclined surface of the central wedge (420) is provided with an inclined T-shaped guide key (421), and the inner side of the tensioning segment (430) is provided with an inclined T-shaped guide groove (431) that slides with the inclined T-shaped guide key (421); the upper part of the central pull rod (450) is threadedly connected to the drive sleeve (452), the lower side of the flange of the drive sleeve (452) is supported on the central wedge (420) by a lower thrust washer (453), and the upper side of the flange is axially limited by an upper thrust washer (455) and a pressure cap (454) fixed on the central wedge (420); the pressure cap (454) is threadedly connected with an anti-rotation screw (456) that can abut against the outer circumferential surface of the drive sleeve (452).

7. The on-board double-stage locking gear clamping device for final clamping calibration according to claim 1, characterized in that, It also includes a fixed measuring bracket (600), a telescopic rod (610), and a displacement measuring device (620); the fixed measuring bracket (600) is fixed to the non-rotational bearing of the machine tool, the telescopic rod (610) is slidably disposed on the fixed measuring bracket (600) and locked by the measuring bracket locking screw (623); the displacement measuring device (620) is fixed on the telescopic rod (610), and the telescopic rod (610) moves in a direction toward or away from the final clamping assembly (400) so that the measuring rod (621) of the displacement measuring device (620) switches between the measuring position and the exit position.

8. A clamping method for a double-stage locking gear clamping device with post-clamping calibration according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Position the gear workpiece (900) on the final clamping assembly (400) and complete the final clamping; S2. Maintain the clamping state of the final clamping assembly (400) on the gear workpiece (900), and release the first locking assembly (220) and the second locking assembly (340). Move the measuring rod (621) to a position that contacts the continuous reference cylindrical surface (901) of the gear workpiece (900), obtain the radial runout by rotation measurement, and adjust the position of the X moving platform (200) and the Y moving platform (300) after stopping the rotation, and repeat the measurement and adjustment. S3. After alignment, make the corresponding pressure heads of the first locking component (220) and the second locking component (340) press against the corresponding locking rails respectively. Then insert the first verification rod (250) and the second verification rod (370) along the corresponding guide holes respectively, and confirm that the rod ends pass through the two verification holes (224) of the same level in sequence and then extend out from the end guide hole to verify the position of the two pressure heads of the same level. S4. Exit the first verification rod (250) and the second verification rod (370), and measure the continuous reference cylindrical surface (901) again while maintaining the final clamp and two-stage locking. After locking and re-measuring to meet the processing requirements, move the measuring rod (621) to the exit position.

9. The clamping method according to claim 8, characterized in that, In step S3, when the first verification rod (250) or the second verification rod (370) is blocked, the blocked verification rod is removed, and the corresponding pressure head, locking rail and verification hole (224) are checked. After removing foreign objects or abnormal positions, the rod is relocked and verified. In step S4, when the retest after locking exceeds the predetermined radial runout limit, the clamping state of the final clamping assembly (400) is maintained, the first-level lock that needs adjustment is released, the corresponding moving platform is adjusted, and then the locking, verification and retesting are performed again.

10. The clamping method according to claim 8, characterized in that, It also includes the following steps: S5. After the processing is completed and the rotation stops, keep the measuring rod (621) in the exit position, keep the first locking component (220) and the second locking component (340) locked, and then release the clamping of the gear workpiece (900) by the final clamping component (400) and take out the gear workpiece (900). S6. After cleaning the support parts, guide parts and verification holes (224), release the two-level lock and reset the X moving platform (200) and the Y moving platform (300).

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