Semi-open type thin-wall shaft barrel clamping method

Abstract

The semi-open type thin-wall shaft barrel clamping method comprises the following steps that S1, the two ends of a part are fixed, and a cavity and a small-end symmetric plane of the part are milled; s2, two side walls of the cavity of the part are pressed from the inner side and the outer side, a conical surface groove of the part is milled, and the conical surface groove is milled into an end face slotting groove along the taper; and S3, a solid support is installed in the part, the opening end of the part is clamped through an adjustable clamp, and the end face slotting groove and the arc face of the small end of the part are milled. The problems that a semi-open type thin-wall shaft barrel is difficult to clamp and the center height cannot be accurately adjusted can be solved, and the technical problems that when a semi-open type slot is milled, the size precision and the form and position precision of all parts related to the slot are extremely difficult to guarantee and even cannot be guaranteed are solved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a method for clamping a semi-open thin-walled shaft barrel. Background Art

[0002] Semi-open thin-walled shaft barrel parts have the characteristics of thin walls, poor rigidity, and easy deformation. They are prone to deformation during processing, resulting in out-of-tolerance aperture size and roundness. Especially when milling semi-open slits, the deformation problem is more significant. The dimensional accuracy and shape and position accuracy of each part related to the slit are extremely difficult to guarantee, or even impossible to guarantee. At present, in order to prevent the deformation of thin-walled shaft barrel parts during processing, the commonly used open set clamping, large arc soft claw clamping, mandrel clamping and other methods can no longer meet the processing accuracy requirements of semi-open thin-walled shaft barrel parts. Summary of the invention

[0003] The purpose of the invention is to provide a method for clamping a semi-open thin-walled shaft cylinder, which can solve the problems of difficulty in clamping a semi-open thin-walled shaft cylinder and inability to accurately adjust the center height, as well as the technical difficulty that the dimensional accuracy and shape and position accuracy of various parts related to the semi-open slit are extremely difficult to ensure or even cannot be ensured when milling the semi-open slit.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A method for clamping a semi-open thin-walled shaft cylinder comprises the following steps:

[0006] S1, fix the two ends of the parts, mill the cavity of the parts and the symmetric plane of the small end;

[0007] S2. Press the two side walls of the cavity of the part from the inside and outside, mill the conical groove of the part, and mill along the taper to the end face slot;

[0008] S3. Install a solid support inside the part, clamp the open end of the part with an adjustable fixture, and mill the end face slit groove and the arc surface of the small end of the part.

[0009] Alternatively, in S1, a dividing head is used to clamp one end of the part, and a center and tailstock are used to clamp the other end of the part.

[0010] Optionally, in S2, a thin-walled frame clamp is used to clamp the two side walls of the cavity of the part; the thin-walled frame clamp includes: the cavity locating seat is a concave body, the inner side surface of the cavity locating seat cooperates with the outer side surface of the cavity of the part; a pull block is provided in the cavity locating seat, and clamping blocks are provided on both sides of the pull block, the inner side surface of the clamping block cooperates with the pull block through an inclined surface, and the outer side surface of the pull block cooperates with the inner side surface of the cavity of the part; a through hole is provided at the bottom of the cavity locating seat, and a bolt passes upward through the through hole of the cavity locating seat to connect the pull block; two clamping blocks are placed symmetrically on both sides of the cavity of the part in the direction of the cone surface to contact the inner side surface of the cavity of the part, and are placed in the middle of the clamping block, and finally a bolt is used to pass through the bottom through hole of the cavity locating seat, connect the threaded hole at the bottom end of the pull block, and tighten them repeatedly in sequence to tighten the pull block, and utilize the characteristics of the inclined surface cooperation to make the two inner sides of the cavity of the part receive equal, uniform and symmetrical clamping force.

[0011] Optionally, the upper portion of the pull block is wider than the lower portion, and the small end of the pull block faces downward.

[0012] Optionally, in S3, a supporting mandrel is used to support the inside of the part; a frustum is provided at the end of the supporting mandrel, and the frustum is clearance-matched with the inner conical surface of the part; and chamfers are provided at both ends of the frustum.

[0013] Optionally, the mandrel is placed into the inner hole of the part through the through hole of the dividing head to form a solid support inside the part.

[0014] Optionally, in S3, a self-centering adjustable V-shaped seat is used to clamp the open end of the part; the self-centering adjustable V-shaped seat includes a base, and the base is connected to a lifting workbench via a trapezoidal screw; a radial screw is provided on the lifting workbench, and both ends of the radial screw are respectively provided with V-shaped jaws that can move toward / away from each other, and the openings of the V-shaped jaws are opposite to each other.

[0015] Optionally, the center height of the self-centering adjustable V-seat is adjusted to be equal to the center of the part, and then the V-jaw is moved to clamp the part, and the V-jaw clamps the part to form a 4-line contact.

[0016] Optionally, positioning seats are provided on both sides of the base, and the bottom of the trapezoidal screw is fixed to the outer side of the positioning seat through a limit block; the limit block is also provided with a first locking screw, and the bottom of the trapezoidal screw is provided with a V-shaped groove, and the first locking screw passes through the limit block and is tightened against the V-shaped groove.

[0017] Optionally, nut seats that are connected to the trapezoidal lead screw are provided on both sides of the lifting workbench, and locking nuts are provided above the nut seats, and the locking nuts are screwed onto the trapezoidal lead screw; guide rail grooves in the up-and-down directions are provided on both sides of the lifting workbench, and T-shaped guide rails in the up-and-down directions are provided on both sides of the base, and the T-shaped guide rails are arranged in the guide rail grooves, and a second locking screw for tightening the T-shaped guide rail is also provided on the rear side of the lifting workbench; a clamp is provided above the lifting workbench through a positioning pin, and the radial lead screw is arranged on the lifting workbench through the clamp.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] 1. The present invention provides a semi-open thin-walled shaft barrel clamping method, which combines the characteristics of the semi-open thin-walled shaft barrel and proposes a three-step anti-deformation manufacturing method, so that the parts can be processed in one step, the shape and position accuracy of the parts can be guaranteed, the processing deformation can be effectively avoided, and the accuracy of the parts after the slit is effectively guaranteed;

[0020] 2. The semi-open thin-walled shaft barrel clamping method provided by the present invention uses an innovative thin-walled cavity clamping structure. In combination with the thin wall thickness and poor rigidity of the cavity of the part, the thin-walled cavity clamping structure is innovatively designed to evenly and symmetrically distribute the clamping force to the inner and outer thin-wall surfaces of the cavity of the part, effectively enhancing the rigidity of the thin-walled cavity of the part, ensuring that the part is not deformed due to the influence of the cutting force, and making the part clamping more firmly;

[0021] 3. The semi-open thin-walled shaft barrel clamping method provided by the present invention has an innovative design of an adjustable height lifting workbench, which cooperates with a self-centering V-shaped jaw to form a 4-line contact symmetrical clamping, thereby realizing precise and free adjustment of the center height of the part, improving the clamping rigidity of the part, and avoiding deformation of the part during clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of the S1 step.

[0024] Figure 2 is a schematic diagram of the S2 step.

[0025] Figure 3 is a schematic diagram of the S3 step.

[0026] Figure 4 It is a schematic diagram of the parts.

[0027] Figure 5 is a schematic diagram of a thin-walled frame clamp.

[0028] Figure 6is a schematic diagram of the support mandrel.

[0029] Figure 7 It is an exploded diagram of a self-centering adjustable V-seat.

[0030] Markings in the figure: 1-part, 11-cavity, 12-conical groove, 13-slit groove, 14-inner cone, 2-thin-wall frame clamp, 21-cavity positioning seat, 22-pull block, 23-pressure block, 24-bolt, 3-support mandrel, 31-cone, 4-self-centering adjustable V-type seat, 41-base, 42-lifting workbench, 43-radial screw, 44-V-type jaws, 45-positioning seat, 46-trapezoidal screw, 47-limiting block, 48-first locking screw, 49-V-shaped groove, 410-clamp, 411-nut seat, 412-locking nut, 413-guide groove, 414-T-type guide rail, 415-second locking screw, 5-dividing head, 6-top. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0033] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0034] A method for clamping a semi-open thin-walled shaft cylinder, such as Figure 1-7 As shown, the following steps are included:

[0035] S1. Fix the two ends of part 1, and mill the cavity 11 and the small end symmetry plane of part 1. This fixing method can effectively enhance the clamping rigidity of part 1 and prevent deformation of part 1 due to cutting force during milling.

[0036] S2. Press the two side walls of the cavity 11 of the part 1 from the inside and outside, mill the conical groove 12 of the part 1, and mill along the taper to the end face slit groove 13; by pressing the two side walls of the cavity 11 of the part 1 from the inside and outside, the clamping force is evenly and symmetrically distributed to the inner and outer wall surfaces of the thin-walled cavity 11, thereby further enhancing the rigidity of the part 1 and avoiding deformation of the part 1 when milling the conical groove 12.

[0037] S3. Install a solid support inside the part 1, clamp the open end of the part 1 with an adjustable fixture, and mill the end face slot 13 and the arc surface of the small end of the part 1. The solid support and symmetrical clamping are formed, which further improves the clamping rigidity of the part 1 and avoids deformation of the part 1 when milling the end face slot 13 and the arc surface of the small end.

[0038] In this solution, step S1 can ensure the position accuracy of each surface of the thin-walled cavity 11 by fixing the two ends of part 1, avoiding processing errors caused by unstable clamping. Step S2 prevents the cavity 11 from shaking by evenly and symmetrically distributing the clamping force, ensuring the integrity and accuracy of the conical groove 12, and avoiding processing deformation caused by uneven clamping force. Step S3 ensures the processing accuracy of the end face slit groove 13 and the small end arc surface through solid support and symmetrical clamping, avoiding the influence of the deformation of part 1 on the processing accuracy. Through the three-step clamping and processing method, part 1 is processed in one step, ensuring the shape and position accuracy of part 1, and avoiding the accumulation of errors caused by multiple clamping and processing.

[0039] As another specific implementation, in S1, a dividing head 5 is used to clamp one end of the part 1, and a centering point 6 and a tailstock are used to press against the other end of the part 1. The use of the dividing head 5 and the centering point 6 can ensure that the center height and axis position of the part 1 are accurately fixed, avoiding the displacement or tilt of the part 1 during the processing, thereby ensuring the position accuracy of the thin-walled cavity 11 and each surface. The use of the dividing head 5 can also realize the precise indexing and rotation of the part 1, facilitating the milling of the symmetrical plane and ensuring the consistency of the processing accuracy.

[0040] As another specific embodiment, in S2, a thin-walled frame clamp 2 is used to clamp the two side walls of the cavity 11 of the part 1; the thin-walled frame clamp 2 includes a cavity positioning seat 45, the cavity positioning seat 45 is a concave body, and the inner side surface of the cavity positioning seat 45 cooperates with the outer side surface of the cavity 11 of the part 1; a pull block 22 is provided in the cavity positioning seat 45, and clamping blocks 23 are provided on both sides of the pull block 22, and the inner side surface of the clamping block 23 cooperates with the pull block 22 through an inclined surface, and the outer side surface of the pull block 22 cooperates with the inner side surface of the cavity 11 of the part 1; the A through hole is provided at the bottom of the cavity locating seat 45, and a bolt 24 passes upward through the through hole of the cavity locating seat 45 to connect the pulling block 22; two clamping blocks 23 are placed symmetrically on both sides of the cavity 11 of the part 1 in the direction of the cone surface to contact the inner side surface of the cavity 11 of the part 1, and are placed in the middle of the clamping block 23. Finally, a bolt 24 is used to pass through the bottom through hole of the cavity locating seat 45, connect the threaded hole at the bottom end of the pulling block 22, and tighten them repeatedly in sequence to tighten the pulling block 22. By utilizing the characteristics of the inclined surface matching, the two inner sides of the cavity 11 of the part 1 are subjected to equal, uniform and symmetrical clamping force.

[0041] The two sides of the pull block 22 cooperate with the clamping block 23 through the inclined surface. When the bolt 24 drives the pull block 22 to move up and down, the inclined surface will convert the up and down movement of the pull block 22 into the horizontal movement of the clamping block 23, so that the clamping block 23 evenly and symmetrically presses the two side walls of the cavity 11 of the part 1. It ensures that the clamping force is evenly distributed to the inner and outer wall surfaces of the cavity 11 of the part 1, avoiding deformation caused by local stress concentration. The inner side surface of the cavity positioning seat 45 is tightly matched with the outer side surface of the cavity 11 of the part 1 to form an external support to prevent the part 1 from opening and deforming outward during the processing. The outer side surface of the pull block 22 cooperates with the inner side surface of the cavity 11 of the part 1 to form an internal support, further enhancing the overall rigidity of the part 1 and preventing the part 1 from being deformed due to cutting force when milling the conical groove 12. The pull block 22 is connected by the bolt 24 passing upward through the through hole of the cavity positioning seat 45, driving the pull block 22 to move up and down. The operation is simple and fast, and the part 1 can be quickly clamped and disassembled. By adjusting the tightening degree of the bolt 24, the size of the clamping force can be flexibly controlled. The thin-walled frame clamp 2 has a compact structure and does not require complicated adjustments during the clamping process. It is suitable for mass production and improves the clamping efficiency. After the processing is completed, the pull block 22 can be pushed out by screws to avoid deformation of the part 1 due to improper disassembly. The cavity locating seat 45 and the pull block 22 cooperate with the outer wall and inner wall of the part 1 respectively, forming an internal and external double support, ensuring the stability of the part 1 during the processing and avoiding dimensional deviations caused by unstable clamping. The symmetrical design of the clamping block 23 ensures the uniform distribution of the clamping force, avoids deflection or distortion of the part 1 during the processing, and ensures the processing accuracy of the conical groove 12.

[0042] As another specific embodiment, the upper part of the pull block 22 is wider than the lower part, and the small end of the pull block 22 is facing downward. The small end of the pull block 22 is placed downward, and the pull block 22 is moved downward naturally by gravity, and the clamping block 23 presses the inner side of the cavity 11 of the part 1 outward under the cooperation of the inclined surface. This design can effectively prevent the clamping block 23 from moving upward due to uneven force or vibration during the clamping process, thereby ensuring the stability of the clamping force. When the pull block 22 moves downward, the inclined surface cooperation will produce a self-locking effect, further preventing the clamping block 23 from moving upward, ensuring that the clamping force continues to act evenly on the inner side of the cavity 11 of the part 1. Furthermore, the left and right structures of the pull block 22 are symmetrical, and the two clamping blocks 23 are symmetrically placed along the symmetry axis of the pull block 22, so that the two walls of the cavity 11 of the part 1 are subjected to equal, uniform and symmetrical clamping forces.

[0043] As another specific implementation, in S3, a support mandrel 3 is used to support the inside of the part 1; a frustum 31 is provided at the end of the support mandrel 3, and the frustum 31 is clearance-matched with the inner conical surface 14 of the part 1; and chamfers are provided at both ends of the frustum 31. The support mandrel 3 forms a solid support inside the part 1, which significantly enhances the overall rigidity of the part 1 and prevents the deformation of the part 1 caused by the cutting force when the end face slot 13 and the small end arc surface are milled. The clearance fit between the frustum 31 and the inner conical surface 14 of the part 1 (the clearance is 0.01 to 0.02 mm) ensures the close contact between the support mandrel 3 and the inner hole of the part 1, further enhances the rigidity of the part 1, and avoids vibration or deformation of the part 1 during the processing. The conical surface of the support mandrel 3 and the inner conical surface 14 of the part 1 have a contact surface of 70%. The rounded corners reduce the friction between the support mandrel 3 and the inner conical surface 14 of the part 1 during clamping, making the clamping process smoother, further improving the clamping efficiency, and effectively avoiding the influence of the corner on the matching accuracy between the conical surface of the support mandrel 3 and the inner conical surface 14 of the part 1.

[0044] As another specific implementation, the mandrel is placed into the inner hole of the part 1 through the through hole of the dividing head 5, forming a solid support inside the part 1. This ensures that the mandrel is accurately aligned with the inner hole of the part 1, and avoids machining errors caused by misalignment between the support mandrel 3 and the inner hole of the part 1.

[0045] As another specific implementation, in S3, a self-centering adjustable V-shaped seat 4 is used to clamp the open end of the part 1; the self-centering adjustable V-shaped seat 4 includes a base 41, and the base 41 is connected to a lifting workbench 42 through a trapezoidal screw 46; the lifting workbench 42 is provided with a radial screw 43, and the two ends of the radial screw 43 are respectively provided with V-shaped jaws 44 that can move toward / away from each other, and the openings of the V-shaped jaws 44 are relative. By rotating the trapezoidal screw 46, the height of the lifting workbench 42 can be accurately adjusted to ensure that the center height of the part 1 is consistent with the center height of the dividing head 5, thereby achieving precise and free adjustment of the center height of the part 1. The radial screw 43 drives the two V-shaped jaws 44 to move toward or away from each other, thereby achieving self-centering clamping of the part 1 and further improving the clamping accuracy. The openings of the V-shaped jaws 44 are relative, and can automatically center the open end of the part 1, ensuring that the part 1 is always in the center position during the clamping process, thereby avoiding processing errors caused by eccentric clamping.

[0046] As another specific implementation, the center height of the self-centering adjustable V-shaped seat 4 is adjusted to be equal to the center of the part 1, and then the V-shaped jaws 44 are moved to clamp the part 1. The V-shaped jaws 44 clamp the part 1 to form a four-line contact. When the V-shaped jaws 44 clamp the part 1, a four-line contact symmetrical clamping is formed, and the clamping force is evenly distributed, which significantly enhances the clamping rigidity of the part 1 and avoids deformation of the part 1 due to uneven clamping force during processing. The self-centering adjustable V-shaped seat 4 is used in conjunction with the support mandrel 3 to form internal and external double support, further enhancing the overall rigidity of the part 1 and preventing deformation of the part 1 due to cutting force when milling the end face slit groove 13 and the small end arc surface. The self-centering function of the V-shaped jaws 44 ensures that the part 1 is always in the center position during the clamping process, avoiding processing errors caused by eccentric clamping.

[0047] As another specific embodiment, positioning seats 45 are provided on both sides of the base 41, and the bottom of the trapezoidal screw 46 is fixed to the outer side of the positioning seat 45 through a limit block 47; the limit block 47 is also provided with a first locking screw 48, and the bottom of the trapezoidal screw 46 is provided with a V-shaped groove 49, and the first locking screw 48 passes through the limit block 47 and is tightened with the V-shaped groove 49. Positioning seats 45 are provided on both sides of the base 41 to form a stable support structure, further enhancing the overall rigidity of the self-centering adjustable V-shaped seat 4, and preventing clamping errors caused by structural deformation. The bottom of the trapezoidal screw 46 is fixed to the outer side of the positioning seat 45 through a limit block 47, which enhances the rigidity of the trapezoidal screw 46, prevents the trapezoidal screw 46 from bending or deformation when subjected to force, and ensures the stability of the lifting workbench 42. The tightening design of the first locking screw 48 and the V-shaped groove 49 effectively prevents the trapezoidal lead screw 46 from moving when subjected to force or vibration, ensures the stability of the trapezoidal lead screw 46, and further improves the clamping accuracy; and can achieve accurate positioning of the trapezoidal lead screw 46, ensuring the stability and accuracy of the lifting table 42. Among them, the distance H1 from the lifting table 42 to the center of the V-shaped jaws 44 is a fixed value, which is conducive to using the self-centering adjustable V-shaped seat 4 to cooperate with the dividing head 5 to clamp the part 1, and quickly and accurately adjust the center height H to be equal to the center height of the part 1 clamped by the dividing head 5, so as to realize batch high-precision self-centering clamping.

[0048] As another specific embodiment, nut seats 411 connected to the trapezoidal screw rod 46 are provided on both sides of the lifting workbench 42, and locking nuts 412 are provided above the nut seats 411, and the locking nuts 412 are screwed onto the trapezoidal screw rod 46; guide rail grooves 413 in the up and down directions are provided on both sides of the lifting workbench 42, and T-shaped guide rails 414 in the up and down directions are provided on both sides of the base 41, and the T-shaped guide rails 414 are arranged in the guide rail grooves 413, and the rear side of the lifting workbench 42 is also provided with a second locking screw 415 for tightening the T-shaped guide rail 414; a clamp 410 is provided above the lifting workbench 42 through a positioning pin.

[0049] As another specific embodiment, nut seats 411 for docking with the trapezoidal lead screw 46 are provided on both sides of the lifting workbench 42, and locking nuts 412 are provided above the nut seats 411, and the locking nuts 412 are screwed on the trapezoidal lead screw 46; guide rail grooves 413 in the up-and-down directions are provided on both sides of the lifting workbench 42, and T-shaped guide rails 414 in the up-and-down directions are provided on both sides of the base 41, and the T-shaped guide rails 414 are arranged in the guide rail grooves 413, and the rear side of the lifting workbench 42 is also provided with a second locking screw 415 for tightening the T-shaped guide rails 414; a clamp 410 is provided above the lifting workbench 42 through a positioning pin, and the radial lead screw 43 is arranged on the lifting workbench 42 through the clamp 410. The lifting workbench 42 docks with the trapezoidal lead screw 46 through the nut seats 411, which ensures the stability and accuracy of the lifting workbench 42 when moving up and down, and avoids shaking or deviation caused by poor matching between the lead screw and the nut. The locking nut 412 is used to lock the transmission trapezoidal lead screw and the nut seat 411, which is beneficial to improve the load-bearing capacity of the workbench and prevent the workbench from vibrating and deflecting when subjected to force. Guide rail grooves 413 are provided on both sides of the lifting workbench 42, and T-shaped guide rails 414 are provided on both sides of the base 41. The T-shaped guide rails 414 are arranged in the guide rail grooves 413, forming a stable guide structure, enhancing the rigidity of the lifting workbench 42, and preventing the lifting workbench 42 from deforming when subjected to force. A second locking screw 415 is provided on the rear side of the lifting workbench 42, which is used to tighten the T-shaped guide rail 414, effectively preventing the lifting workbench 42 from deflecting or shaking due to the matching clearance of the T-shaped guide rail 414, and further enhancing the rigidity of the structure. The clamp 410 is installed on the lifting workbench 42 by the positioning pin, ensuring the precise positioning of the clamp 410 and the lifting workbench 42, avoiding the displacement or shaking of the clamp 410 during the clamping process, and further improving the clamping accuracy.

[0050] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for clamping a semi-open thin-walled shaft cylinder, characterized in that: The following steps are involved: S1, fixing the two ends of the part (1), milling the cavity (11) of the part (1) and the symmetric plane of the small end; S2, pressing the two side walls of the cavity (11) of the part (1) from the inside and outside, milling the conical groove (12) of the part (1), and milling along the taper to the end face slit groove (13); S3. Install a solid support inside the part (1), clamp the open end of the part (1) with an adjustable clamp, and mill the end face slot (13) and the arc surface of the small end of the part (1).

2. The method for clamping a semi-open thin-walled shaft cylinder according to claim 1, characterized in that: In S1, a dividing head (5) is used to clamp one end of a part (1), and a center (6) and a tailstock are used to press the other end of the part (1).

3. The method for clamping a semi-open thin-walled shaft cylinder according to claim 1, characterized in that: In S2, a thin-walled frame clamp (2) is used to clamp the two side walls of the cavity (11) of the part (1); the thin-walled frame clamp (2) includes: the cavity positioning seat (45) is a concave body, the inner side surface of the cavity positioning seat (45) cooperates with the outer side surface of the cavity (11) of the part (1); a pull block (22) is provided in the cavity positioning seat (45), and clamping blocks (23) are provided on both sides of the pull block (22), the inner side surface of the clamping block (23) cooperates with the pull block (22) through an inclined surface, and the outer side surface of the pull block (22) cooperates with the inner side surface of the cavity (11) of the part (1); the cavity positioning seat (45) A through hole is provided at the bottom, and a bolt (24) is passed upward through the through hole of the cavity positioning seat (45) to connect the pulling block (22); two clamping blocks (23) are placed symmetrically on both sides of the cavity (11) of the part (1) in the direction of the cone surface to contact the inner side surface of the cavity (11) of the part (1), and are placed in the middle of the clamping block (23); finally, a bolt (24) is used to pass through the bottom through hole of the cavity positioning seat (45) to connect the threaded hole at the bottom end of the pulling block (22), and the bolts are repeatedly tightened in sequence to tighten the pulling block (22). By utilizing the characteristics of the inclined surface matching, the two inner sides of the cavity (11) of the part (1) are subjected to equal, uniform and symmetrical clamping forces.

4. The method for clamping a semi-open thin-walled shaft cylinder according to claim 3, characterized in that: The upper part of the pull block (22) is wider than the lower part, and the small end of the pull block (22) faces downward.

5. The method for clamping a semi-open thin-walled shaft cylinder according to claim 1, characterized in that: In S3, a support core shaft (3) is used to support the inside of the part (1); a frustum (31) is provided at the end of the support core shaft (3), and the frustum (31) is clearance-matched with the inner conical surface (14) of the part (1); and chamfered corners are provided at both ends of the frustum (31).

6. The method for clamping a semi-open thin-walled shaft cylinder according to claim 5, characterized in that: The mandrel is inserted into the inner hole of the part (1) through the through hole of the dividing head (5), forming a solid support inside the part (1).

7. The method for clamping a semi-open thin-walled shaft cylinder according to claim 1, characterized in that: In S3, a self-centering adjustable V-shaped seat (4) is used to clamp the open end of the part (1); the self-centering adjustable V-shaped seat (4) includes a base (41), and the base (41) is connected to a lifting workbench (42) via a trapezoidal screw (46); the lifting workbench (42) is provided with a radial screw (43), and the two ends of the radial screw (43) are respectively provided with V-shaped jaws (44) that can move toward / away from each other, and the openings of the V-shaped jaws (44) are opposite to each other.

8. The method for clamping a semi-open thin-walled shaft cylinder according to claim 7, characterized in that: The center height of the self-centering adjustable V-shaped seat (4) is adjusted to be equal to the center of the part (1), and then the V-shaped jaws (44) are moved to clamp the part (1). The V-shaped jaws (44) clamp the part (1) to form a four-line contact.

9. The method for clamping a semi-open thin-walled shaft cylinder according to claim 7, characterized in that: Positioning seats (45) are provided on both sides of the base (41), and the bottom of the trapezoidal screw rod (46) is fixed to the outer side of the positioning seat (45) through a limiting block (47); the limiting block (47) is also provided with a first locking screw (48), and the bottom of the trapezoidal screw rod (46) is provided with a V-shaped groove, and the first locking screw (48) passes through the limiting block (47) and is tightened with the V-shaped groove.

10. The method for clamping a semi-open thin-walled shaft cylinder according to claim 7, characterized in that: Nut seats (411) for docking with the trapezoidal lead screw (46) are provided on both sides of the lifting workbench (42), and locking nuts (412) are provided above the nut seats (411), and the locking nuts (412) are screwed onto the trapezoidal lead screw (46); guide rail grooves (413) are provided on both sides of the lifting workbench (42) in the up-and-down directions, and T-shaped guide rails (414) are provided on both sides of the base (41) in the up-and-down directions, and the T-shaped guide rails (414) are arranged in the guide rail grooves (413); a second locking screw (415) for tightening the T-shaped guide rail (414) is also provided on the rear side of the lifting workbench (42); a clamp (410) is provided above the lifting workbench (42) through a positioning pin, and the radial lead screw (43) is arranged on the lifting workbench (42) through the clamp (410).

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