A semi-open thin-walled shaft sleeve clamping method

Abstract

The application discloses a semi-open thin-wall shaft cylinder clamping method, which comprises the following steps: S1, fixing both end portions of a part, and milling a cavity and a small-end symmetric plane of the part; S2, pressing both side walls of the cavity of the part from the inner and outer sides, milling a conical surface groove of the part, and milling along the taper to the end face slot; and S3, installing a solid support in the part, clamping the open end of the part by using an adjustable clamp, and milling an end face slot of the part and a circular surface of the small end. The application can solve the problems of semi-open thin-wall shaft cylinder clamping difficulty and the problem that the center height cannot be accurately adjusted, and can solve the technical problem that the dimensional accuracy and geometric accuracy of each part related to the slotting are extremely difficult to guarantee or even cannot be guaranteed when milling the semi-open slot.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a method for clamping a semi-open thin-walled shaft. Background Technology

[0002] Semi-open thin-walled cylindrical parts are characterized by their thin walls, poor rigidity, and susceptibility to deformation. During machining, deformation easily occurs, leading to deviations in hole diameter and roundness. This deformation problem is particularly pronounced when milling semi-open slits, making it extremely difficult, if not impossible, to guarantee the dimensional and positional accuracy of the parts related to the slit. Currently, commonly used methods to prevent deformation during machining of thin-walled cylindrical parts, such as open-end clamping, large-arc soft jaw clamping, and mandrel clamping, are no longer sufficient to meet the machining accuracy requirements of semi-open thin-walled cylindrical parts. Summary of the Invention

[0003] The purpose of this invention is to provide a method for clamping a semi-open thin-walled shaft, which can solve the problems of difficulty in clamping a semi-open thin-walled shaft, inability to accurately adjust the center height, and the technical problem that it is extremely difficult or even impossible to guarantee the dimensional and positional accuracy of various parts related to the slit when milling a semi-open slit.

[0004] The technical solution adopted in this invention is as follows: A method for clamping a semi-open thin-walled shaft sleeve includes the following steps: S1. Fix both ends of the fixed part and mill the cavity and the symmetrical plane of the small end of the part; S2. Press the two side walls of the cavity of the part from both the inside and outside, and mill the tapered groove of the part along the taper to the end face slot. S3. Install a solid support inside the part, use an adjustable clamp to clamp the open end of the part, and mill the end face of the part to open the groove and the arc surface of the small end.

[0005] Alternatively, in S1, an indexing head is used to hold one end of the part, while the center and tailstock press against the other end of the part.

[0006] Alternatively, in S2, a thin-walled frame clamp is used to press the two side walls of the cavity of the part; the thin-walled frame clamp includes a cavity positioning seat that is concave, the inner side of the cavity positioning seat and the outer side of the cavity of the part are fitted; a pull block is provided inside the cavity positioning seat, and a clamping block is provided on both sides of the pull block, the inner side of the clamping block and the pull block are fitted by an inclined surface, and the outer side of the pull block is fitted with the inner side of the cavity of the part; a through hole is provided at the bottom of the cavity positioning seat, and a bolt passes upward through the through hole of the cavity positioning seat to connect the pull block; the two clamping blocks are placed symmetrically on both sides of the cavity of the part in the direction of the conical surface, contacting the inner side of the cavity of the part, and placed in the middle of the clamping blocks. Finally, a bolt is passed through the bottom through hole of the cavity positioning seat and connected to the threaded hole at the bottom of the pull block, and tightened repeatedly to tighten the pull block. By utilizing the characteristic of the inclined surface fit, the two inner sides of the cavity of the part are subjected to equal, uniform and symmetrical clamping force.

[0007] Alternatively, the upper part of the pull block is wider than the lower part, and the small end of the pull block faces downward.

[0008] Alternatively, in S3, a support mandrel is used to support the part inside; the end of the support mandrel is provided with a truncated cone, which is in clearance fit with the inner conical surface of the part; both ends of the truncated cone are provided with rounded corners.

[0009] Alternatively, the mandrel can be inserted into the inner hole of the part through the through hole of the indexing head, forming a solid support inside the part.

[0010] Alternatively, 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, on which a lifting worktable is connected via a trapezoidal screw; the lifting worktable is provided with a radial screw, and each end of the radial screw is provided with a V-shaped jaw that can move towards or away from each other, with the openings of the V-shaped jaws facing each other.

[0011] Alternatively, the center height of the self-centering adjustable V-shaped seat can be adjusted to be equal to the center of the part, and then the V-jaws can be moved to clamp the part, forming a 4-line contact.

[0012] Alternatively, the base is provided with positioning seats on both sides, and the bottom of the trapezoidal lead screw is fixed to the outside of the positioning seats by a limiting block; the limiting block is also provided with a first locking screw, and the bottom of the trapezoidal lead screw is provided with a V-groove, and the first locking screw passes through the limiting block and is tightened against the V-groove.

[0013] Optionally, the lifting worktable has nut seats on both sides that mate with the trapezoidal lead screw, and a locking nut is provided above the nut seats, which is screwed onto the trapezoidal lead screw; the lifting worktable has guide rail grooves in the vertical direction on both sides, and the base has T-shaped guide rails in the vertical direction on both sides, which are located in the guide rail grooves; a second locking screw for tightening the T-shaped guide rails is also provided on the rear side of the lifting worktable; a clamp is provided above the lifting worktable via a positioning pin, and the radial lead screw is mounted on the lifting worktable via the clamp.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention provides a clamping method for a semi-open thin-walled shaft cylinder, which, combined with the characteristics of the semi-open thin-walled shaft cylinder, proposes a three-step anti-deformation manufacturing method, realizes the part is processed in one step, ensures the shape and position accuracy of the part, effectively avoids processing deformation, and effectively ensures the accuracy of the part after the slit is opened. 2. The semi-open thin-walled shaft clamping method provided by the present invention uses an innovative thin-walled cavity clamping structure. Taking into account the thickness and rigidity of the cavity wall of the part, the innovative design of the thin-walled cavity clamping structure makes the clamping force evenly and symmetrically distributed on the inner and outer thin-walled 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 cutting force, and making the part clamped more firmly. 3. The semi-open thin-walled shaft clamping method provided by this invention features an innovative design of an adjustable height lifting worktable, which, together with a self-centering V-shaped jaw, forms a symmetrical clamping with four-line contact. This enables precise and free adjustment of the center height of the part, improves the clamping rigidity of the part, and avoids part deformation during clamping. Attached Figure Description

[0015] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of step S1.

[0016] Figure 2 This is a schematic diagram of step S2.

[0017] Figure 3 This is a schematic diagram of step S3.

[0018] Figure 4 This is a schematic diagram of the part.

[0019] Figure 5 This is a schematic diagram of a thin-walled frame clamp.

[0020] Figure 6 This is a schematic diagram of the supporting mandrel.

[0021] Figure 7This is an exploded view of a self-centering adjustable V-shaped base.

[0022] The markings in the diagram are: 1-part, 11-cavity, 12-conical groove, 13-slotted groove, 14-inner conical surface, 2-thin-walled frame clamp, 21-cavity positioning seat, 22-pull block, 23-clamping block, 24-bolt, 3-support mandrel, 31-conical frustum, 4-self-centering adjustable V-slot, 41-base, 42-lifting worktable, 43-radial screw, 44-V-jaw, 45-positioning seat, 46-trapezoidal screw, 47-limiting block, 48-first locking screw, 49-V-groove, 410-jaw, 411-nut seat, 412-locking nut, 413-guide rail groove, 414-T-shaped guide rail, 415-second locking screw, 5-indexing head, 6-center. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0025] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0026] A method for clamping a semi-open thin-walled shaft sleeve, such as Figure 1-7 As shown, it includes the following steps: S1. Fix both ends of part 1 and mill the cavity 11 and the plane of symmetry of the small end of part 1. This fixing method can effectively enhance the clamping rigidity of part 1 and prevent part 1 from deforming due to cutting force during milling.

[0027] S2. Press the two side walls of the cavity 11 of part 1 from both the inside and outside, and mill the conical groove 12 of part 1 along the taper to the end face slot 13; by pressing the two side walls of the cavity 11 of part 1 from both the inside and outside, the clamping force is evenly and symmetrically distributed to the inner and outer walls of the thin-walled cavity 11, which further enhances the rigidity of part 1 and avoids the deformation of part 1 when milling the conical groove 12.

[0028] S3. Install a solid support inside part 1, use an adjustable clamp to clamp the open end of part 1, and mill the end face slot 13 and the arc surface of the small end of part 1. This forms a solid support and symmetrical clamping, which further improves the clamping rigidity of part 1 and avoids deformation of part 1 when milling the end face slot 13 and the arc surface of the small end.

[0029] In this solution, step S1, by fixing both ends of part 1, ensures the positional accuracy of each surface of the thin-walled cavity 11, avoiding machining errors caused by unstable clamping. Step S2, through uniform and symmetrical clamping force distribution, prevents the cavity 11 from shaking, ensuring the integrity and accuracy of the conical groove 12, and avoiding machining deformation caused by uneven clamping force. Step S3, through solid support and symmetrical clamping, ensures the machining accuracy of the end face slot 13 and the small end arc surface, avoiding the impact of part 1 deformation on machining accuracy. Through this three-step clamping and machining method, part 1 is machined in one operation, ensuring the shape and positional accuracy of part 1 and avoiding the accumulation of errors caused by multiple clamping and machining operations.

[0030] In another specific implementation, in S1, an indexing head 5 clamps one end of part 1, while a center 6 and a tailstock press against the other end of part 1. The combined use of the indexing head 5 and the center 6 ensures that the center height and axial position of part 1 are precisely fixed, preventing part 1 from shifting or tilting during processing, thereby ensuring the positional accuracy of the thin-walled cavity 11 and its surfaces. The use of the indexing head 5 also enables precise indexing and rotation of part 1, facilitating milling of symmetrical planes and ensuring consistent machining accuracy.

[0031] In another specific implementation, in S2, a thin-walled frame clamp 2 is used to press the two side walls of the cavity 11 of the part 1; the thin-walled frame clamp 2 includes a cavity positioning seat 21, which is a concave body, and the inner side of the cavity positioning seat 21 cooperates with the outer side of the cavity 11 of the part 1; a pull block 22 is provided inside the cavity positioning seat 21, and a clamping block 23 is provided on both sides of the pull block 22, the inner side of the clamping block 23 cooperates with the pull block 22 through an inclined surface, and the outer side of the pull block 22 cooperates with the inner side of the cavity 11 of the part 1; The bottom of the cavity positioning seat 21 is provided with a through hole. The bolt 24 passes upward through the through hole of the cavity positioning seat 21 to connect the pull block 22. The 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 and in contact with the inner surface of the cavity 11 of the part 1. The two clamping blocks 23 are placed in the middle of the clamping blocks 23. Finally, the bolt 24 passes through the bottom through hole of the cavity positioning seat 21 and connects to the threaded hole at the bottom of the pull block 22. The bolts are tightened repeatedly to tighten the pull block 22. By utilizing the characteristics of the inclined surface fit, the two inner surfaces of the cavity 11 of the part 1 are subjected to equal, uniform and symmetrical clamping forces.

[0032] The pull block 22 engages with the clamping block 23 on both sides via inclined surfaces. When the bolt 24 moves the pull block 22 up and down, the inclined surfaces convert the up-and-down movement of the pull block 22 into the horizontal movement of the clamping block 23, thereby allowing the clamping block 23 to uniformly and symmetrically clamp the two side walls of the cavity 11 of part 1. This ensures that the clamping force is evenly distributed on the inner and outer walls of the cavity 11 of part 1, avoiding deformation caused by local stress concentration. The inner side of the cavity positioning seat 21 is tightly engaged with the outer side of the cavity 11 of part 1, forming external support and preventing part 1 from opening outward during processing. The outer side of the pull block 22 engages with the inner side of the cavity 11 of part 1, forming internal support, further enhancing the overall rigidity of part 1 and preventing deformation caused by cutting force when milling the conical groove 12. The pull block 22 is connected to the through hole of the cavity positioning seat 21 via the bolt 24, which moves the pull block 22 up and down. The operation is simple and fast, enabling quick clamping and unclamping of part 1. The clamping force can be flexibly controlled by adjusting the tightening degree of bolt 24. The thin-walled frame clamp 2 has a compact structure, requires no complex adjustments during clamping, is suitable for mass production, and improves clamping efficiency. After machining, the pull block 22 can be ejected by screws to avoid deformation of part 1 due to improper disassembly. The cavity positioning seat 21 and the pull block 22 respectively cooperate with the outer and inner wall surfaces of part 1, forming double internal and external support, ensuring the stability of part 1 during machining and avoiding dimensional deviations due to unstable clamping. The symmetrical design of the clamping block 23 ensures the uniform distribution of clamping force, preventing part 1 from skewing or twisting during machining and ensuring the machining accuracy of the conical groove 12.

[0033] In another specific embodiment, the upper part of the pull block 22 is wider than the lower part, and the smaller end of the pull block 22 faces downward. With the smaller end of the pull block 22 facing downward, gravity causes the pull block 22 to move naturally downward, while the clamping block 23, in the inclined plane engagement, presses outward against the inner surface of the cavity 11 of the part 1. This design effectively prevents the clamping block 23 from moving upward during clamping due to uneven force or vibration, ensuring the stability of the clamping force. When the pull block 22 moves downward, the inclined plane engagement generates 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 surface of the cavity 11 of the part 1. Furthermore, the pull block 22 has a symmetrical left-right structure, and the two clamping blocks 23 are symmetrically placed along the axis of symmetry of the pull block 22, so that the walls of the two cavities 11 of the part 1 are subjected to equal, uniform, and symmetrical clamping forces.

[0034] In another specific implementation, in S3, a support mandrel 3 is used to support the part 1 inside; the end of the support mandrel 3 is provided with a frustum 31, which is clearance-fitted with the inner conical surface 14 of the part 1; both ends of the frustum 31 are rounded. The support mandrel 3 forms a solid support inside the part 1, significantly enhancing the overall rigidity of the part 1 and preventing deformation of the part 1 due to cutting forces when milling the end face slot 13 and the small end arc surface. The clearance fit between the frustum 31 and the inner conical surface 14 of the part 1 (fitting clearance 0.01~0.02mm) ensures tight contact between the support mandrel 3 and the inner hole of the part 1, further enhancing the rigidity of the part 1 and preventing vibration or deformation of the part 1 during processing. The contact area between the conical surface of the support mandrel 3 and the inner conical surface 14 of the part 1 is 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 impact of corners on the fitting accuracy between the conical surface of the support mandrel 3 and the inner conical surface 14 of the part 1.

[0035] In another specific implementation, the mandrel is inserted into the inner hole of part 1 through the through hole of the indexing head 5, forming a solid support inside part 1. This ensures precise alignment between the mandrel and the inner hole of part 1, avoiding machining errors caused by misalignment between the supporting mandrel 3 and the inner hole of part 1.

[0036] In another specific implementation, in S3, a self-centering adjustable V-shaped seat 4 is used to clamp the open end of part 1. The self-centering adjustable V-shaped seat 4 includes a base 41, on which a lifting worktable 42 is connected via a trapezoidal lead screw 46. The lifting worktable 42 is equipped with a radial lead screw 43, and each end of the radial lead screw 43 has a V-shaped jaw 44 that can move towards or away from each other, with the openings of the V-shaped jaws 44 facing each other. By rotating the trapezoidal lead screw 46, the height of the lifting worktable 42 can be precisely adjusted to ensure that the center height of part 1 is consistent with the center height of the indexing head 5, thus achieving precise and free adjustment of the center height of part 1. The radial lead screw 43 drives the two V-shaped jaws 44 to move towards or away from each other, achieving self-centering clamping of part 1 and further improving clamping accuracy. The facing openings of the V-shaped jaws 44 can automatically center the open end of part 1, ensuring that part 1 is always in the center position during clamping, avoiding machining errors caused by clamping eccentricity.

[0037] In another specific implementation, the center height of the self-centering adjustable V-shaped seat 4 is adjusted to be equal to the center of part 1. Then, the V-jaw 44 is moved to clamp part 1, forming a four-line contact. When the V-jaw 44 clamps part 1, it forms a symmetrical four-line contact clamping, evenly distributing the clamping force, significantly enhancing the clamping rigidity of part 1 and avoiding deformation of part 1 due to uneven clamping force during processing. The self-centering adjustable V-shaped seat 4, used in conjunction with the support mandrel 3, forms double internal and external support, further enhancing the overall rigidity of part 1 and preventing deformation of part 1 due to cutting force when milling the end face slot 13 and the small end arc surface. The self-centering function of the V-jaw 44 ensures that part 1 is always in the centered position during clamping, avoiding processing errors caused by clamping eccentricity.

[0038] In another specific embodiment, the base 41 is provided with positioning seats 45 on both sides, and the bottom of the trapezoidal lead screw 46 is fixed to the outside of the positioning seats 45 by limiting blocks 47; the limiting blocks 47 are also provided with first locking screws 48, and the bottom of the trapezoidal lead screw 46 is provided with a V-groove 49, through which the first locking screw 48 passes and is tightened against the V-groove 49. The positioning seats 45 on both sides of the base 41 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 lead screw 46 is fixed to the outside of the positioning seats 45 by the limiting blocks 47, enhancing the rigidity of the trapezoidal lead screw 46 and preventing the trapezoidal lead screw 46 from bending or deforming under force, thus ensuring the stability of the lifting worktable 42. The tightening design of the first locking screw 48 and the V-groove 49 effectively prevents the trapezoidal lead screw 46 from shifting under force or vibration, ensuring the stability of the trapezoidal lead screw 46 and further improving the clamping accuracy; it also enables precise positioning of the trapezoidal lead screw 46, ensuring the stability and accuracy of the lifting worktable 42. The distance H1 from the lifting worktable 42 to the center of the V-jaw 44 is a fixed value, which is beneficial for quickly and accurately adjusting the center height H to be equal to the center height of the part 1 held by the dividing head 5 when using the self-centering adjustable V-seat 4 in conjunction with the dividing head 5 to clamp the part 1, achieving high-precision self-centering clamping in batches.

[0039] In another specific embodiment, the lifting worktable 42 is provided with nut seats 411 on both sides that mate with the trapezoidal lead screw 46, and a locking nut 412 is provided above the nut seats 411. The locking nut 412 is screwed onto the trapezoidal lead screw 46. The lifting worktable 42 is provided with guide rail grooves 413 in the vertical direction on both sides, and the base 41 is provided with T-shaped guide rails 414 in the vertical direction on both sides. The T-shaped guide rails 414 are located in the guide rail grooves 413. The rear side of the lifting worktable 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 worktable 42 through a positioning pin.

[0040] In another specific embodiment, the lifting worktable 42 has nut seats 411 on both sides that mate with the trapezoidal lead screw 46. A locking nut 412 is located above the nut seats 411 and is screwed onto the trapezoidal lead screw 46. The lifting worktable 42 has vertical guide rail grooves 413 on both sides, and the base 41 has vertical T-shaped guide rails 414 on both sides, which are located within the guide rail grooves 413. A second locking screw 415 for tightening the T-shaped guide rails 414 is also provided on the rear side of the lifting worktable 42. A clamp 410 is installed above the lifting worktable 42 via a positioning pin, and the radial lead screw 43 is mounted on the lifting worktable 42 via the clamp 410. The connection between the lifting worktable 42 and the trapezoidal lead screw 46 through the nut seats 411 ensures the stability and accuracy of the lifting worktable 42 during vertical movement, preventing wobbling or offset caused by poor fit between the lead screw and nut. The locking nut 412 is used to lock the transmission trapezoidal lead screw and the nut seat 411, which helps to improve the load-bearing capacity of the worktable and prevents the worktable from vibrating and shifting under force. The lifting worktable 42 has guide rail grooves 413 on both sides, and the base 41 has T-shaped guide rails 414 on both sides. The T-shaped guide rails 414 are located within the guide rail grooves 413, forming a stable guiding structure, enhancing the rigidity of the lifting worktable 42, and preventing deformation under force. A second locking screw 415 is provided on the rear side of the lifting worktable 42 to tighten the T-shaped guide rails 414, effectively preventing the lifting worktable 42 from shifting or shaking due to the fit clearance of the T-shaped guide rails 414, further enhancing the rigidity of the structure. The clamp 410 is installed on the lifting worktable 42 by a positioning pin, ensuring precise positioning of the clamp 410 and the lifting worktable 42, avoiding shifting or shaking of the clamp 410 during clamping, and further improving clamping accuracy.

[0041] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A method for clamping a semi-open thin-walled shaft sleeve, characterized in that: Includes the following steps: S1. Fix both ends of part (1) and mill the cavity (11) and the plane of symmetry of the small end of part (1); S2. Press the two side walls of the cavity (11) of the part (1) from both inside and outside, mill the tapered groove (12) of the part (1), and mill along the taper to the end face slot (13); use a thin-walled frame clamp (2) to press the two side walls of the cavity (11) of the part (1); the thin-walled frame clamp (2) includes a cavity positioning seat (21), the cavity positioning seat (21) is a concave body, the inner side of the cavity positioning seat (21) and the outer side of the cavity (11) of the part (1) are fitted; the cavity positioning seat (21) is provided with a pull block (22), and both sides of the pull block (22) are provided with clamping blocks (23), the inner side of the clamping block (23) and the pull block (22) are fitted by an inclined surface, the pull block (22) The outer side mates with the inner side of the cavity (11) of the part (1); the bottom of the cavity positioning seat (21) is provided with a through hole, and the bolt (24) passes through the through hole of the cavity positioning seat (21) upward to connect the pull block (22); the 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 and in contact with the inner side of the cavity (11) of the part (1), and placed in the middle of the clamping block (23). Finally, the bolt (24) passes through the bottom through hole of the cavity positioning seat (21) and connects to the threaded hole at the bottom of the pull block (22). The bolt is tightened repeatedly in sequence to tighten the pull block (22). By utilizing the characteristics of the inclined surface mating, the two inner sides of the cavity (11) of the part (1) are subjected to equal, uniform and symmetrical clamping forces. S3. Install a solid support inside the part (1), use an adjustable clamp to clamp the open end of the part (1), mill the end face of the part (1) with a slot (13) and the arc surface of the small end; use a support mandrel (3) to support inside the part (1); the end of the support mandrel (3) is provided with a cone (31), the cone (31) is clearance-fitted with the inner cone surface (14) of the part (1); the two ends of the cone (31) are provided with rounded corners.

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

3. The semi-open thin-walled shaft clamping method as described in claim 1, 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.

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

5. The method for clamping a semi-open thin-walled shaft cylinder as described in 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 a lifting worktable (42) is connected to the base (41) through a trapezoidal screw (46); the lifting worktable (42) is provided with a radial screw (43), and each end of the radial screw (43) is provided with a V-shaped jaw (44) that can move towards or away from each other, and the openings of the V-shaped jaw (44) are opposite to each other.

6. The method for clamping a semi-open thin-walled shaft cylinder as described in claim 5, characterized in that: Adjust the center height of the self-centering adjustable V-shaped seat (4) to make it equal to the center of the part (1), and then move the V-shaped jaws (44) to clamp the part (1). The V-shaped jaws (44) clamp the part (1) to form a 4-line contact.

7. The method for clamping a semi-open thin-walled shaft cylinder as described in claim 5, characterized in that: The base (41) has positioning seats (45) on both sides. The bottom of the trapezoidal lead screw (46) is fixed to the outside of the positioning seat (45) by a limiting block (47). The limiting block (47) is also provided with a first locking screw (48). The bottom of the trapezoidal lead screw (46) is provided with a V-groove. The first locking screw (48) passes through the limiting block (47) and is tightened against the V-groove.

8. The method for clamping a semi-open thin-walled shaft cylinder as described in claim 5, characterized in that: The lifting worktable (42) has nut seats (411) on both sides that are connected to the trapezoidal lead screw (46). A locking nut (412) is provided above the nut seat (411) and the locking nut (412) is screwed onto the trapezoidal lead screw (46). The lifting worktable (42) has guide rail grooves (413) in the vertical direction on both sides. The base (41) has T-shaped guide rails (414) in the vertical direction on both sides. The T-shaped guide rails (414) are located in the guide rail grooves (413). The rear side of the lifting worktable (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 worktable (42) through a positioning pin. The radial lead screw (43) is located on the lifting worktable (42) through the clamp (410).

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