Guide sleeve processing tool and numerical control lathe

Abstract

This invention relates to the technical field of tooling fixtures, and more particularly to a guide sleeve machining fixture and a CNC lathe, comprising an integral kit and a replacement kit. The replacement kit includes an inner tensioning component and an outer clamping component. The guide sleeve machining fixture can switch between an inner tensioning state connected to the inner tensioning component and an outer clamping state connected to the outer clamping component. Its advantage is that the fixture can meet the usage requirements for machining the inner and outer walls of the guide sleeve, ensuring the fixture's adaptability to guide sleeve machining. Because the first and second expansion sleeves are in surface contact with the guide sleeve, and because the first and second expansion sleeves are rigid, they have higher clamping accuracy compared to elastic jaws in the prior art; compared to multi-jaw chucks in the prior art, they have a larger contact area, making it less likely to cause guide sleeve deformation, thereby improving the machining quality and accuracy of the guide sleeve.

Description

Technical Field

[0001] This invention relates to the technical field of tooling and fixtures, and more particularly to a guide sleeve machining tooling and a CNC lathe. Background Technology

[0002] The column, jack, hydraulic cylinder base, and guide sleeve are the main supporting structures for installation and are extremely important for the critical hydraulic system of the hydraulic support. Their precision affects subsequent installation and use. The structure of cylinder ring sleeves is constantly being updated, and many problems have arisen under the implementation of these new processes. Large-diameter, thin-walled sleeves are widely used, primarily serving a supporting or guiding function in the machine.

[0003] Thin-walled sleeve parts have poor rigidity and low strength, making them prone to deformation during processing due to various factors. Significant deformation exceeding tolerances directly impacts product quality. Furthermore, the severe deformation during processing necessitates repeated adjustments to parts and processing procedures, which can disrupt production schedules, especially during periods of high order volume and tight deadlines. If a thin-walled guide sleeve exhibits severe deviations from tolerances, it may fail to meet product requirements and must be scrapped, thus increasing procurement, forging, and processing costs.

[0004] Patent application number 202011406619.4 discloses a six-jaw chuck with an elastic clamping device. The elastic jaws increase the contact area with the product, preventing deformation during clamping. When the product does not slip during processing, the clamping force of the machine tool can be appropriately reduced to better avoid deformation of bushing-type parts with large roundness due to clamping. However, the elastic jaws can cause slight wobbling of the workpiece during turning, which is detrimental to ensuring the machining accuracy of the workpiece.

[0005] Therefore, rigid clamping fixtures are still needed to ensure the machining accuracy of the guide sleeve. When using rigid fixtures, such as multi-jaw chucks, the guide sleeve, due to its thin wall, will slightly deform under clamping force. When the jaws are released, due to elasticity, the outer circle returns to a cylindrical shape, while the inner hole becomes an arc-shaped triangle. This deformation will affect the dimensional and shape accuracy of the workpiece. Furthermore, both the inner and outer walls of the guide sleeve need to be machined, and multi-jaw chucks cannot meet the requirements for clamping the inner and outer diameters of the workpiece. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a guide sleeve machining fixture and a CNC lathe, which solves the technical problems in the prior art where the machining accuracy of the elastic clamping fixture is insufficient to meet the requirements of the guide sleeve, the rigid clamping fixture including multi-grip chuck is prone to deformation of the guide sleeve, and the existing fixtures cannot meet the requirements of clamping the inner and outer diameters of the guide sleeve.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] In a first aspect, the present invention provides a guide sleeve processing fixture, comprising an integral kit and a replacement kit. The integral kit includes a fixed base, an outer pull sleeve slidably connected to the fixed base, an outer slide block and an inner slide block supported in the inner cavity of the fixed base, and an inner pull rod axially extending through and slidably connected to the inner slide block. The outer slide block is located outside the inner slide block. The replacement kit includes an inner tensioning assembly and an outer clamping assembly. The guide sleeve processing fixture can switch between an inner tensioning state connected to the inner tensioning assembly and an outer clamping state connected to the outer clamping assembly. The inner tensioning assembly includes an inner clamping block detachably connected to the front end of the inner pull rod, and a first expansion sleeve sleeved outside the inner clamping block, whose two ends can be clamped by the inner clamping block and the inner slide block. When the first expansion sleeve is axially clamped, the first expansion sleeve expands outward. The outer clamping assembly includes an outer clamping sleeve fixedly connected to the front end of the outer pull sleeve, and a second expansion sleeve disposed in the inner cavity of the outer clamping sleeve, whose two ends can be clamped by the outer pull sleeve and the outer slide block. When the second expansion sleeve is clamped, the second expansion sleeve retracts inward.

[0011] Secondly, the present invention provides a CNC lathe, including a spindle box and a guide sleeve machining fixture as described in the technical solution, supported on the spindle box. The CNC lathe is suitable for turning the guide sleeve held by the guide sleeve machining fixture.

[0012] (III) Beneficial Effects

[0013] The beneficial effects of this invention are as follows: The guide sleeve machining fixture and CNC lathe of this invention, because the fixture includes detachable replacement kits, connect the inner tensioning assembly when the fixture needs to be matched with the outer surface machining process of the guide sleeve, and connect the outer clamping assembly when the fixture needs to be matched with the inner surface machining process of the guide sleeve. That is, the fixture can switch between an inner tension state and an outer clamping state, meeting the usage requirements for machining the inner and outer walls of the guide sleeve, and ensuring the adaptability of the fixture for guide sleeve machining. The inner tensioning assembly and outer clamping assembly, as replaceable kits used on demand, are easy to replace and maintain.

[0014] Meanwhile, by replacing the first and second expansion sleeves with different sizes, it can adapt to guide sleeves of different sizes, thus improving the tooling's size compatibility range for guide sleeves.

[0015] Furthermore, the tooling relies on the first or second expansion sleeve to define the position of the guide sleeve. Since the first and second expansion sleeves are in surface contact with the guide sleeve and are rigid, it has higher clamping accuracy compared to the elastic claws in the prior art. Compared to the multi-jaw chucks in the prior art, it has a larger contact area and is less likely to cause deformation of the guide sleeve. Therefore, even when the thickness of the guide sleeve is thin, the tooling can achieve stable clamping without destroying the shape of the guide sleeve, thereby improving the machining quality and machining accuracy of the guide sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the guide sleeve machining tool of the present invention in an internally tensioned state;

[0017] Figure 2 For the present invention Figure 1 A cross-sectional structural diagram of YY;

[0018] Figure 3 This is a schematic diagram of the guide sleeve machining tool of the present invention in the external clamping state;

[0019] Figure 4 For the present invention Figure 3 A cross-sectional structural diagram of XX.

[0020] [Explanation of Labels in the Attached Image]

[0021] 100. Guide sleeve;

[0022] 1: Complete kit; 11: Fixing base; 12: Outer pull sleeve; 13: Outer slide; 14: Inner slide; 15: Inner pull rod;

[0023] 2: Internal tensioning assembly; 21: Inner clamping block; 22: First tensioning sleeve;

[0024] 3: External clamping assembly; 31, outer clamping sleeve; 32, second expansion sleeve;

[0025] 231. Strip block; 232. Rubber pad;

[0026] A. First contact point;

[0027] B. Second contact point;

[0028] C. Internal bevel;

[0029] D. Outer inclined plane;

[0030] 4: Intermediate gear;

[0031] 5: Meshing section. Detailed Implementation

[0032] To better explain and facilitate understanding of this invention, the following description is provided in conjunction with the appendix. Figures 1-4 The present invention will be described in detail through specific embodiments. In this document, directional terms such as "upper" and "lower" are used interchangeably with other directional terms. Figure 1 With reference to the orientation, Figure 1 In the diagram, the right side represents "front" and the left side represents "back".

[0033] Example 1:

[0034] Reference Figures 1-4 This invention provides a guide sleeve processing fixture, comprising an integral kit 1 and a replacement kit. The integral kit 1 includes a fixed base 11, an outer pull sleeve 12 slidably connected to the fixed base 11, an outer slide seat 13 and an inner slide seat 14 supported in the inner cavity of the fixed base 11, and an inner pull rod 15 axially extending through and slidably connected to the inner slide seat 14. The outer slide seat 13 is located outside the inner slide seat 14. The replacement kit includes an inner tensioning component 2 and an outer clamping component 3. The guide sleeve processing fixture can switch between an inner tensioning state connected to the inner tensioning component 2 and an outer clamping state connected to the outer clamping component 3. The inner tensioning component 2 includes an inner clamping block 21 detachably connected to the front end of the inner pull rod 15, and a first expansion sleeve 22 sleeved outside the inner clamping block 21, whose two ends can be axially clamped by the inner clamping block 21 and the inner slide seat 14. When the first expansion sleeve 22 is clamped, the first expansion sleeve 22 expands outward. The outer clamping assembly 3 includes an outer clamping sleeve 31 fixedly connected to the front end of the outer pull sleeve 12, and a second expansion sleeve 32 disposed in the inner cavity of the outer clamping sleeve 31 and whose two ends can be axially clamped by the outer pull sleeve 12 and the outer slide block 13. When the second expansion sleeve 32 is clamped, the second expansion sleeve 32 retracts inward.

[0035] In this embodiment, since the tooling includes detachable replacement kits, the inner tensioning component 2 is connected when the tooling is needed for machining the outer surface of the guide sleeve 100. When the tooling is needed for machining the inner surface of the guide sleeve 100, the outer clamping component 3 is connected. That is, the tooling can switch between an inner tension state and an outer clamping state, meeting the usage requirements for machining the inner and outer walls of the guide sleeve 100 and ensuring the tooling's adaptability to the machining of the guide sleeve 100. The inner tensioning component 2 and the outer clamping component 3, as replaceable kits used on demand, are easy to replace and maintain.

[0036] Meanwhile, by replacing the first expansion sleeve 22 and the second expansion sleeve 32 with different sizes, it is possible to adapt to guide sleeves 100 of different sizes, thereby improving the size compatibility range of the tooling for guide sleeves 100.

[0037] Furthermore, the tooling relies on the first expansion sleeve 22 or the second expansion sleeve 32 to define the position of the guide sleeve 100. Since the first expansion sleeve 22 and the second expansion sleeve 32 are in surface contact with the guide sleeve 100, and the first expansion sleeve 22 and the second expansion sleeve 32 are rigid, they have higher clamping accuracy compared to the elastic claws in the prior art. Compared to the multi-jaw chucks in the prior art, they have a larger contact area and are less likely to cause deformation of the guide sleeve 100. Therefore, even when the thickness of the guide sleeve 100 is relatively thin, the tooling can achieve stable clamping without destroying the shape of the guide sleeve 100, thereby improving the processing quality and processing accuracy of the guide sleeve 100.

[0038] Specifically, the guide sleeve machining fixture embodies modularity and flexibility, adapting to different machining needs and improving production efficiency and machining accuracy. The fixed base 11 serves as the basic support structure of the fixture, providing a stable mounting platform. The outer pull sleeve 12 is slidably connected to the outside of the fixed base 11, used to adjust the position of the outer clamping assembly 3 or apply clamping force. The outer slide 13 and inner slide 14 are supported within the cavity of the fixed base 11, with the inner slide 14 located inside the outer slide 13. The outer slide 13 provides end support for the external clamping of the guide sleeve 100, and the inner slide 14 provides end support for the internal tensioning of the guide sleeve 100.

[0039] The inner tie rod 15 axially passes through the inner slide block 14 and is slidably connected to the inner slide block 14, used to drive the inner clamping block 21 to slide axially, so that it can cooperate with the inner slide block 14 to clamp the first tension sleeve 22. The outer tie sleeve 12 can also slide axially, so as to drive the outer clamping sleeve 31 to slide axially, so that it can cooperate with the outer slide block 13 to clamp the second tension sleeve 32. The inner clamping block 21 is detachably connected to the front end of the inner tie rod 15. The first tension sleeve 22 is sleeved on the inner clamping block 21, and both ends can be clamped by the inner clamping block 21 and the inner slide block 14. When clamped, the first tension sleeve 22 expands outward, used to internally tension the guide sleeve 100.

[0040] The outer clamping sleeve 31 is detachably and fixedly connected to the front end of the outer pull sleeve 12, providing a stable clamping structure. The second expansion sleeve 32 is located in the inner cavity of the outer clamping sleeve 31, and its two ends can be clamped by the outer pull sleeve 12 and the outer slide block 13. When clamped, the second expansion sleeve 32 retracts inward to externally clamp the guide sleeve 100.

[0041] Two first abutment portions A are formed on the inner slide block 14 and the inner clamping block 21. The first expansion sleeve 22 can be sleeved on the outer side of the inner clamping block 21 and its two ends can abut against the two first abutment portions A. In the internal tension state, the inner pull rod 15 can drive the inner clamping block 21 to slide axially relative to the inner slide block 14, thereby enabling the first expansion sleeve 22 to switch between an outwardly expanding tension state and an inwardly contracting first loosening state.

[0042] In this embodiment, when the inner clamping block 21 moves closer to the inner slide block 14 under the action of the inner pull rod 15, the first expansion sleeve 22 is compressed, thereby expanding outward and entering a tensioned state. This expansion allows the expansion sleeve to fit tightly against the inner wall of the guide sleeve 100, achieving the effect of internal tension.

[0043] Conversely, when the inner clamping block 21 moves away from the inner slide block 14 under the action of the inner pull rod 15, the clamping force at both ends of the first expansion sleeve 22 decreases, and the expansion sleeve contracts inward under its own elasticity, entering the first loosened state. This loosened state allows the guide sleeve 100 to be easily removed or inserted.

[0044] The inner tie rod 15 drives the inner clamping block 21 to slide axially relative to the inner slide block 14, and the first expansion sleeve 22 abuts against the first contact part A of the two, realizing the switching between the first expansion sleeve 22 in the tensioned state and the first loosened state, providing flexibility and controllability for the processing process, enabling the tooling to adapt to guide sleeves 100 of different sizes and shapes, and improving processing efficiency and accuracy.

[0045] The outer pull sleeve 12 is fixedly connected to the rear end of the inner pull rod 15, and an axially extending clamping cavity is formed inside the outer pull sleeve 12. Two second abutment portions B are formed on the front end of the outer slide block 13 and the inner wall of the outer clamping sleeve 31. The second expansion sleeve 32 can be disposed in the clamping cavity and its two ends respectively abut against the two second abutment portions B. In the external clamping state, the outer pull sleeve 12 can drive the outer clamping sleeve 31 to slide axially relative to the outer slide block 13, thereby enabling the second expansion sleeve 32 to switch between an inwardly contracting clamping state and an outwardly expanding second loosening state.

[0046] In this embodiment, the outer pull sleeve 12 is fixedly connected to the rear end of the inner pull rod 15. This allows the outer pull sleeve 12 to slide axially by moving the inner pull rod 15, enabling the inner pull rod 15 and the outer pull sleeve 12 to share a single drive unit, thus improving control convenience. Furthermore, even though they share a single drive unit, since the inner tensioning component 2 and the outer clamping component 3 are not simultaneously connected to the fixture, the synchronous sliding of the inner pull rod 15 and the outer pull sleeve 12 will not affect the normal use of the fixture.

[0047] The guide sleeve machining fixture also includes a first telescopic drive component, which is fixedly connected to the rear end of the inner tie rod 15 to drive the inner tie rod 15 to extend and retract axially. The first telescopic drive component can be configured as a cylinder.

[0048] An axially extending clamping cavity is formed inside the outer sleeve 12, which provides space for the installation and movement of the second expansion sleeve 32. Two second abutment portions B are formed on the front end of the outer slide block 13 and the inner wall of the outer sleeve 31, respectively, to ensure that the expansion sleeve can be stably placed in the clamping cavity and can retract inward to clamp the guide sleeve 100 when subjected to clamping force.

[0049] In the internally tensioned state, the outer pull sleeve 12 can drive the outer clamping sleeve 31 to slide axially relative to the outer slide block 13. The sliding motion is achieved by the pulling or pushing force of the inner pull rod 15. When the outer clamping sleeve 31 slides relative to the outer slide block 13, it applies a clamping force to the second expansion sleeve 32 or releases the clamping force.

[0050] When the outer sleeve 31 moves closer to the outer slide block 13, the second expansion sleeve 32 is compressed, thus contracting inward and entering a clamping state. This contraction allows the expansion sleeve to fit tightly against the outer wall of the guide sleeve 100, achieving the effect of external clamping.

[0051] Conversely, when the outer sleeve 31 moves away from the outer slide block 13, the clamping force at both ends of the second expansion sleeve 32 decreases, and the expansion sleeve expands outward under its own elasticity, entering the second loosened state. This loosened state allows the guide sleeve 100 to be easily removed or inserted.

[0052] The outer pull sleeve 12 drives the outer clamping sleeve 31 to slide axially relative to the outer slide block 13, and the second expansion sleeve 32 abuts against the second abutting part B of the two, thereby realizing the switching of the second expansion sleeve 32 between the clamping state and the second loosening state.

[0053] The two ends of the first expansion sleeve 22 form two symmetrical inner inclined surfaces C, and the two ends of the second expansion sleeve 32 form two symmetrical outer inclined surfaces D.

[0054] In this embodiment, the first expansion sleeve 22 has two symmetrical inner inclined surfaces C at its two ends. The design of the inner inclined surfaces C allows the first expansion sleeve 22 to be subjected to a clamping force when it is subjected to a clamping force, so that its two ends can be subjected to an oblique thrust by the first abutment portion A of the inner slide block 14 and the inner clamping block 21. Due to the presence of the inclined surfaces, the force is decomposed into an axial component and a radial component. The radial component allows the first expansion sleeve 22 to expand outward, thereby tightly fitting the inner wall of the guide sleeve 100.

[0055] The second expansion sleeve 32 has two symmetrical outer inclined surfaces D at its two ends. The design of the outer inclined surface D is opposite to that of the inner inclined surface C. When the second expansion sleeve 32 is subjected to clamping force, due to the presence of the inclined surfaces, this force is also decomposed into an axial component and a radial component. In this case, the radial component force allows the expansion sleeve to contract inward, thereby tightly fitting the outer wall of the guide sleeve 100.

[0056] The beveled design allows the expansion sleeve to automatically adjust its radial dimensions when subjected to clamping force, thus adapting to guide sleeves 100 of different sizes. Because the bevel is symmetrical, the expansion sleeve maintains uniformity during expansion or contraction, avoiding localized stress concentration and improving clamping stability and reliability. By adjusting the clamping force, the degree of expansion or contraction of the expansion sleeve can be precisely controlled, thereby achieving precise clamping of the guide sleeve 100.

[0057] Both the first expansion sleeve 22 and the second expansion sleeve 32 include a strip block 231 and a rubber pad 232. The strip block 231 and the rubber pad 232 are circumferentially distributed, and the rubber pad 232 connects the circumferentially adjacent rubber pads 232. The corresponding inner inclined surface C or outer inclined surface D is set at the end of the strip block 231. The rubber pad 232 retracts towards the middle of the strip block 231 in the length direction to make room for the inclined surface.

[0058] Both the inner slide 14 and the outer slide 13 are axially slidably connected to the fixed base 11. In the internal tension state, the inner slide 14 moves forward relative to the outer slide 13, so that the first abutting portion A of the inner clamping block 21 is further forward relative to the second abutting portion B of the outer slide 13. In the external clamping state, the inner slide 14 moves backward relative to the outer slide 13, so that the first abutting portion A of the inner clamping block 21 is further backward relative to the second abutting portion B of the outer slide 13.

[0059] In this embodiment, since the inner slide 14 and the outer slide 13 can slide as needed and be adjusted to a more forward or more backward state, they can make way for the first expansion sleeve 22 and the second expansion sleeve 32, avoiding interference between the outer slide 13 or the inner slide 14 and the first expansion sleeve 22 or the second expansion sleeve 32. This ensures that when the first expansion sleeve 22 or the second expansion sleeve 32 fixes the guide sleeve 100, the outer periphery of the guide sleeve 100 or the inner cavity of the guide sleeve 100 has sufficient clearance to meet processing requirements.

[0060] Meanwhile, the outer pull sleeve 12 and the inner pull rod 15 are also designed to retract and make way, which can also prevent them from affecting the normal turning operation of the guide sleeve 100.

[0061] The guide sleeve machining fixture also includes an intermediate gear 4. The outer wall of the inner slide 14 and the inner wall of the outer slide 13 are both provided with meshing sections 5. The intermediate gear 4 is rotatably supported on the fixed seat 11 and is engaged with both meshing sections 5.

[0062] In this embodiment, the inner slide 14 and the outer slide 13 are configured to slide in a linked manner. By setting the intermediate gear 4 and the meshing section 5, when one of them extends forward, the other retracts, thereby ensuring the reliability of the clearance.

[0063] The guide sleeve machining fixture also includes a second telescopic drive component, which is connected to the inner slide 14 to drive the inner slide 14 to slide axially. In conjunction with the transmission action of the intermediate gear 4 and the meshing section 5, the second telescopic drive component can realize the linkage control of the inner slide 14 and the outer slide 13, thereby improving the reliability of the fixture.

[0064] In addition to providing a CNC lathe, the embodiments of the present invention include a spindle box and a guide sleeve machining fixture of any of the above embodiments supported on the spindle box. The CNC lathe is suitable for turning the guide sleeve 100 held by the guide sleeve machining fixture. Under the action of the fixture, the CNC lathe can machine the inner wall and outer wall of the guide sleeve 100, thus ensuring machining efficiency.

[0065] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0069] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A tooling fixture for machining guide sleeves, characterized in that, The kit includes an overall kit (1) and a replacement kit. The overall kit (1) includes a fixed base (11), an outer pull sleeve (12) slidably connected to the fixed base (11), an outer slide (13) and an inner slide (14) supported in the inner cavity of the fixed base (11), and an inner pull rod (15) axially extending through the inner slide (14) and slidably connected to the inner slide (14). The outer slide (13) is located outside the inner slide (14). The replacement kit includes an inner tensioning assembly (2) and an outer clamping assembly (3); the guide sleeve machining fixture can switch between an inner tensioning state connected to the inner tensioning assembly (2) and an outer clamping state connected to the outer clamping assembly (3); The inner tensioning assembly (2) includes an inner clamping block (21) detachably connected to the front end of the inner pull rod (15), and a first expansion sleeve (22) sleeved outside the inner clamping block (21). When the two ends of the first expansion sleeve (22) are axially clamped by the inner clamping block (21) and the inner slide (14), the first expansion sleeve (22) expands outward. The outer clamping assembly (3) includes an outer clamping sleeve (31) fixedly connected to the front end of the outer pull sleeve (12), and a second expansion sleeve (32) disposed in the inner cavity of the outer clamping sleeve (31). When the two ends of the second expansion sleeve (32) are axially clamped by the outer pull sleeve (12) and the outer slide (13), the second expansion sleeve (32) retracts inward. Two first abutting parts (A) are formed on the inner slide (14) and the inner clamping block (21). The first expansion sleeve (22) can be sleeved on the inner clamping block (21) and its two ends can abut against the two first abutting parts (A). In the internal tension state, the inner pull rod (15) can drive the inner clamp (21) to slide axially relative to the inner slide (14), thereby enabling the first expansion sleeve (22) to switch between an outwardly expanding tension state and an inwardly contracting first loosening state; The outer pull sleeve (12) is fixedly connected to the rear end of the inner pull rod (15), and an axially extending clamping cavity is formed inside the outer pull sleeve (12); two second abutment portions (B) are formed on the front end of the outer slide block (13) and the inner wall of the outer clamping sleeve (31); the second expansion sleeve (32) can be disposed in the clamping cavity and its two ends respectively abut against the two second abutment portions (B); In the external clamping state, the external pull sleeve (12) can drive the external clamping sleeve (31) to slide axially relative to the external slide block (13), thereby enabling the second expansion sleeve (32) to switch between an inwardly contracting clamping state and an outwardly expanding second loosening state; It also includes an intermediate gear (4), and both the outer wall of the inner slide (14) and the inner wall of the outer slide (13) are provided with meshing sections (5). The intermediate gear (4) is rotatably supported on the fixed seat (11) and is meshed with both meshing sections (5). The first expansion sleeve (22) has two symmetrical inner inclined surfaces (C) at both ends, and the second expansion sleeve (32) has two symmetrical outer inclined surfaces (D) at both ends.

2. The guide sleeve machining fixture as described in claim 1, characterized in that, It also includes a first telescopic drive member, which is fixedly connected to the rear end of the inner tie rod (15) to drive the inner tie rod (15) to extend and retract axially.

3. The guide sleeve machining fixture as described in claim 2, characterized in that, Both the inner slide (14) and the outer slide (13) are axially slidably connected to the fixed seat (11); In the internal tension state, the inner slide (14) moves forward relative to the outer slide (13) so that the first abutting part (A) of the inner clamping block (21) is further forward relative to the second abutting part (B) of the outer slide (13); In the external clamping state, the inner slide (14) moves backward relative to the outer slide (13), and the first abutting part (A) of the inner clamping block (21) is further back relative to the second abutting part (B) of the outer slide (13).

4. The guide sleeve machining fixture as described in claim 3, characterized in that, It also includes a second telescopic drive member, which is connected to the inner slide (14) to drive the inner slide (14) to slide axially.

5. The guide sleeve machining fixture as described in claim 4, characterized in that, The first expansion sleeve (22) and the second expansion sleeve (32) both include a strip block (231) and a rubber pad (232). The strip block (231) and the rubber pad (232) are circumferentially distributed, and the rubber pad (232) connects the circumferentially adjacent rubber pads (232).

6. A CNC lathe, characterized in that, The CNC lathe includes a spindle box and a guide sleeve machining fixture supported on the spindle box as described in any one of claims 1-5, and is adapted to turn the guide sleeve (100) held by the guide sleeve machining fixture.

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