A rolling device for fine shaft thread processing with large length-diameter ratio

Abstract

The application discloses a rolling device for machining fine shaft threads with a large length-diameter ratio, and belongs to the technical field of workpiece surface treatment. The rolling device comprises a mounting main body, one end of the mounting main body is connected with a driving element, and the other end of the mounting main body is formed with a first mounting counterbore. The first mounting counterbore is sequentially arranged with a first buffer, a sliding element and a fixing element along a first direction. The first buffer is formed with a buffer gap in the first mounting counterbore, the sliding element is slidingly arranged in the first mounting counterbore, the fixing element is arranged with a sliding gap along the first direction with the sliding element, and the sliding gap is arranged with a ball. The fixing element is provided with a through hole along the first direction, and the ball at least partially extends out of the through hole. The first buffer in the application can apply an elastic force to the ball to realize flexible rolling of the ball on the surface of the workpiece. Meanwhile, the telescopic arrangement of the first buffer and the sliding element enables the ball to move along the first direction to adapt to the positions of the wave crests and wave troughs of the curved surface of the workpiece, and realizes the machining of different positions of the curved surface of the workpiece.

Description

Technical Field

[0001] This invention belongs to the field of workpiece surface treatment technology, specifically relating to a rolling device for machining fine shaft threads with a large length-to-diameter ratio. Background Technology

[0002] Roller burnishing is a non-cutting process that typically involves applying pressure to the surface of a workpiece using hard balls or rollers at room temperature. This flattens out the microscopic irregularities on the workpiece surface, thereby altering its surface structure, mechanical properties, shape, and size. Roller burnishing can make the workpiece surface smooth and improve its strength.

[0003] Currently, traditional rolling processes and modern ultrasonic rolling technologies generally involve several methods, including internal hole rolling, external diameter rolling of shafts, and surface rolling. Internal hole rolling tools can only improve the surface quality of hole-type parts; external diameter rolling of shafts uses a fixed tool head and lacks flexible rolling components, resulting in rigid contact, making it susceptible to damage upon impact. It is suitable for metals with a hardness of HRC18~HRC68, but not for machining aluminum or copper; while surface rolling tools are limited to improving the surface quality of planar workpieces and cannot improve the surface quality of curved surfaces.

[0004] With the continuous development of industrial technology, products with curved shapes are emerging in an endless stream, especially non-metallic curved parts. There are requirements for external surface hardening, surface roughness, and elimination of residual stress. However, existing rolling equipment and processes cannot meet the processing requirements of curved non-metallic materials. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a rolling device for machining fine shaft threads with a large length-to-diameter ratio, so as to solve the problem that the existing rolling devices cannot meet the requirements of surface hardness strengthening, surface roughness and residual stress elimination of non-metallic materials.

[0006] To achieve the above objectives, the present invention provides a rolling device for machining threads on thin shafts with a large length-to-diameter ratio, comprising:

[0007] The mounting body has a drive component connected to one end and a first mounting countersunk hole formed at the other end.

[0008] A first buffer, a sliding member, and a fixing member are arranged sequentially along a first direction inside the first mounting countersunk hole;

[0009] The first buffer member has a buffer gap formed in the first mounting countersunk hole, so that the first buffer member can buffer compression and apply force to the sliding member;

[0010] The sliding member is slidably disposed in the first mounting countersunk hole, the fixing member is connected to the mounting body, the fixing member and the sliding member are provided with a sliding gap along the first direction, and a ball bearing is provided in the sliding gap;

[0011] The fastener has a through hole along the first direction, and the ball extends at least partially out of the through hole.

[0012] As a further improvement of the present invention, a second mounting countersunk hole is provided in the first mounting countersunk hole along the first direction, and the first mounting countersunk hole and the second mounting countersunk hole form a stepped surface.

[0013] The first buffer is disposed in the second mounting countersunk hole, and the sliding member is disposed in the first mounting countersunk hole;

[0014] The first buffer includes a telescopic spring, a transmission ball, and a ball seat arranged sequentially along a first direction;

[0015] One end of the telescopic spring abuts against the bottom wall of the second mounting countersunk hole, and the other end abuts against the transmission ball. The ball seat is provided with a placement hole on the side facing the transmission ball, and the transmission ball is disposed in the placement hole.

[0016] The ball seat is slidably disposed in the second mounting countersunk hole, and the side of the ball seat opposite to the transmission ball abuts against the sliding member.

[0017] As a further improvement of the present invention, a second buffer is provided between the first buffer and the sliding member, and the second buffer is slidably disposed in the first mounting countersunk hole.

[0018] As a further improvement of the present invention, the outer wall of the second buffer member is attached to the inner wall surface of the first mounting countersunk hole, the second buffer member can stretch and deform along the first direction, and the elastic modulus of the second buffer member along the first direction is greater than the elastic modulus of the first buffer member along the first direction.

[0019] As a further improvement of the present invention, the sliding member is slidably disposed in the first mounting countersunk hole, the sliding member is provided with a limiting hole along the second direction, the mounting body is provided with a mounting hole on its side wall, a limiting pin is provided at the mounting hole, the limiting pin is inserted into the limiting hole, and the limiting hole and the limiting pin are left with a gap along the first direction.

[0020] As a further improvement of the present invention, the sliding member has at least two mounting grooves on the side away from the second buffer member, and a driven ball is rotatably disposed in the two mounting grooves. The driven ball protrudes from the mounting groove and abuts against the ball.

[0021] As a further improvement of the present invention, the fastener is covered on the mounting body, the fastener is sleeved on the outer periphery of the mounting body, and a positioning pin is provided between the fastener and the mounting body.

[0022] As a further improvement of the present invention, the fixing member is a magnetic structure, and there is a magnetic attraction between the ball and the fixing member.

[0023] As a further improvement of the present invention, the through hole has an inner wider and outer narrower structure, and the diameter of the ball is not less than the diameter of the opening of the through hole.

[0024] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0025] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include:

[0026] (1) The rolling device for machining fine shaft threads with large length-to-diameter ratio of the present invention, by setting a first buffer and a sliding member, and by using the fixed member and the mounting body to reserve the placement gap of the ball, when the rolling device for machining fine shaft threads with large length-to-diameter ratio of the present application rolls a non-planar structure, the first buffer can transmit the pressure of the driving member to the sliding member, and finally to the ball; the first buffer itself can drive the sliding member to slide along the first direction, so that the ball moves along the first direction to adapt to the crest and trough positions of the curved workpiece surface, and realize the machining of different positions of the curved workpiece; at the same time, the first buffer itself has elasticity, and when the ball rolls the workpiece surface, the ball can extend and retract along the first direction at different curved positions to apply different pressures to the workpiece surface, realize the flexible rolling of the ball on the workpiece surface, and avoid the ball from rigidly contacting the workpiece surface, causing damage to the workpiece surface.

[0027] (2) The rolling device for machining fine shaft threads with large length-to-diameter ratio of the present invention sets the first buffer member in the form of a telescopic spring, a transmission ball and a ball seat, and limits the ball seat by the second mounting countersunk hole, so that the first buffer member can stably extend and retract along the first direction, ensuring that the elastic force applied by the first buffer member to the sliding member is controllable, ensuring that the position of the ball and the rolling force applied by the ball to the workpiece surface are controllable, and improving the rolling quality of the rolling device on the workpiece surface.

[0028] (3) The rolling device for machining fine shaft threads with a large length-to-diameter ratio of the present invention provides a second buffer between the first buffer and the sliding member. When the surface changes normally, the second buffer directly applies the elastic force of the sliding member to the ball bearing for rolling, thereby achieving elastic rolling of the workpiece surface. When encountering a high curvature surface with peaks and troughs, the first buffer and the second buffer work together. The first buffer pushes the second buffer to move, causing the ball bearing to press against the workpiece surface. Then, elastic rolling of the workpiece surface is achieved by applying elastic force. This application achieves stable rolling of the workpiece surface with frequent peaks and troughs by cooperating with the first buffer and the second buffer.

[0029] (4) The rolling device for machining fine shaft threads with large length-to-diameter ratio of the present invention, by opening positioning holes on the sliding part and setting positioning pins accordingly, realizes the sliding operation of the sliding part under the premise of ensuring that the sliding part and the ball are stably installed in the mounting body, and ensures that the sliding part can be adjusted accordingly when facing the peak and trough position of the workpiece, ensuring that the ball is stably pressed on the surface of the workpiece, and ensuring that the rolling process is carried out stably.

[0030] (5) The rolling device for machining fine shaft threads with large length-to-diameter ratio of the present invention is configured as a magnetic structure. When the rolling device is not pressed against the workpiece surface, the ball will be attracted by the fixed part, thus avoiding the problem of the ball falling off the rolling device. At the same time, the through hole of the fixed part is configured as a type with a wider inner and narrower outer shape, so that the ball can be adjusted in terms of the amount of extension without falling off, thus ensuring the stable use of the rolling device. Attached Figure Description

[0031] Figure 1 This is a cross-sectional structural schematic diagram of the rolling device for machining fine shaft threads with a large length-to-diameter ratio in an embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional structural diagram of the mounting body in an embodiment of the present invention;

[0033] Figure 3 yes Figure 1 Enlarged diagram of point A in the middle.

[0034] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0035] 1. Mounting body; 2. First mounting countersunk hole; 3. Second mounting countersunk hole; 4. First buffer component; 5. Sliding component; 6. Fixing component; 7. Second buffer component; 8. Limiting pin; 9. Driven ball; 10. Ball bearing; 11. Through hole;

[0036] 401. Telescopic spring; 402. Transmission ball; 403. Ball seat. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] Example:

[0043] Please see Figures 1-3 The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to a preferred embodiment of the present invention includes a mounting body 1. One end of the mounting body 1 is connected to a driving member, and the other end has a first mounting countersunk hole 2. A first buffer member 4, a sliding member 5, and a fixing member 6 are arranged sequentially in the first mounting countersunk hole 2 along a first direction. The first buffer member 4 has a buffer gap in the first mounting countersunk hole 2, so that the first buffer member 4 can buffer compression and apply force to the sliding member 5. The sliding member 5 is slidably disposed in the first mounting countersunk hole 2, and the fixing member 6 is connected to the mounting body 1. The fixing member 6 leaves a sliding gap in the sliding member 5 along the first direction, and a ball bearing 10 is provided in the sliding gap. The fixing member 6 has a through hole 11 along the first direction, and the ball bearing 10 extends at least partially out of the through hole 11.

[0044] Specifically, the rolling device for machining fine shaft threads with a large length-to-diameter ratio in this application, by setting a first buffer 4 and a sliding member 5, and utilizing the cooperation of the fixing member 6 and the mounting body 1 to reserve a placement gap for the balls 10, makes the position of the balls 10 adjustable. When the rolling device for machining fine shaft threads with a large length-to-diameter ratio in this application rolls non-planar structures, the first buffer 4 can correspondingly transmit the pressure of the driving member to the sliding member 5, and finally to the balls 10. The first buffer 4 itself can drive the sliding member 5 to slide along the first direction, so that the balls 10 move along the first direction to adapt to the crest and trough positions of the curved workpiece surface, realizing the machining of different positions of the curved workpiece. At the same time, the first buffer 4 itself has elasticity. When the balls 10 roll the workpiece surface, the balls 10 can correspondingly extend and retract along the first direction at different curved positions to apply different pressures to the workpiece surface, realizing the flexible rolling of the balls 10 on the workpiece surface, avoiding rigid contact between the balls 10 and the workpiece surface, and preventing damage to the workpiece surface.

[0045] Furthermore, a second mounting countersunk hole 3 is also provided within the first mounting countersunk hole 2 along the first direction in this application, and the first mounting countersunk hole 2 and the second mounting countersunk hole 3 form a stepped surface. A first buffer member 4 is disposed within the second mounting countersunk hole 3, and a sliding member 5 is disposed within the first mounting countersunk hole 2. The first buffer member 4 includes a telescopic spring 401, a transmission ball 402, and a ball seat 403 arranged sequentially along the first direction. One end of the telescopic spring 401 abuts against the bottom wall of the second mounting countersunk hole 3, and the other end abuts against the transmission ball 402. The ball seat 403 has a placement hole on the side facing the transmission ball 402, and the transmission ball 402 is disposed within the placement hole. The ball seat 403 is slidably disposed within the second mounting countersunk hole 3, and the side of the ball seat 403 facing away from the transmission ball 402 abuts against the sliding member 5. In this application, the first buffer 4 is configured as a stable transmission form of telescopic spring 401, transmission ball 402 and ball seat 403, to ensure that the rolling force transmitted from the driving member is stably transmitted to the telescopic spring 401, then to the sliding member 5, and finally applied to the ball 10, thereby achieving stable transmission of elastic force.

[0046] Preferably, in this application, the size of the first buffer 4 is smaller than that of the sliding member 5. In this application, there can be multiple first mounting countersunk holes 2, and multiple first buffers 4 are also provided accordingly, so as to apply stable force to the sliding member 5 through multiple first buffers 4.

[0047] Furthermore, as a preferred embodiment of the present invention, a second buffer 7 is provided between the first buffer 4 and the sliding member 5, and the second buffer 7 is slidably disposed within the first mounting countersunk hole 2. The second buffer 7 cooperates with the first buffer 4 to achieve multi-level buffering, so as to adapt to the changes in the crests and troughs of the processed workpiece and ensure the rolling quality.

[0048] Specifically, the high aspect ratio thin-shaft threaded workpiece in this application is a high aspect ratio thin-shaft T-type thread, whose surface has an alternating crest and trough structure, requiring a rolling device to frequently adapt to the crests and troughs during rolling. Correspondingly, the outer wall of the second buffer 7 in this application is attached to the inner wall surface of the first mounting countersunk hole 2. The second buffer 7 can expand and contract along the first direction, and the elastic modulus of the second buffer 7 along the first direction is greater than that of the first buffer 4 along the first direction.

[0049] During rolling at conventional crests or troughs, the curvature change of the workpiece surface is low, and the balls 10 do not need to expand or contract significantly along the first direction. When the driving component applies pressure to the first buffer 4 and the second buffer 7, the second buffer 7 deforms and compresses itself, and its outer peripheral wall adheres to the inner wall of the first mounting countersunk hole 2, giving it a certain impact resistance. When the balls 10 undulate slightly, the first buffer 4 cannot push the second buffer 7 to move, and the second buffer 7 remains stationary in the set position. The second buffer 7 releases elastic deformation along the first direction, allowing the balls 10 to steadily roll the workpiece surface. When the rolling device transitions from crest to trough or from trough to crest, the ball 10 undergoes significant changes along the first direction, and the sliding block slides accordingly along the first direction. When the second buffer 7 loses contact with the sliding block or is subjected to strong pressure from the sliding block, the second buffer 7 experiences significant deformation, and the pressure between the outer wall of the second buffer 7 and the inner wall of the first mounting countersunk hole 2 changes abruptly. The second buffer 7 then contracts or shifts. At this time, the first buffer 4 applies force and contracts or extends along the first direction, ensuring that the structure of the first buffer 4, the second buffer 7, and the sliding member 5 can stably apply force to the ball 10, thereby achieving the rolling processing of the ball 10 at the crest and trough positions.

[0050] Furthermore, as a preferred embodiment of the present invention, the sliding member 5 is slidably disposed within the first mounting countersunk hole 2. The sliding member 5 has a limiting hole along the second direction and a mounting hole on the side wall of the mounting body 1. A limiting pin 8 is correspondingly provided at the mounting hole, and the limiting pin 8 is inserted into the limiting block. A gap is left between the limiting hole and the limiting pin 8 along the first direction. Since the sliding member 5 can slide along the first mounting countersunk hole 2, while the extension and retraction of the first buffer member 4 along the first direction is limited, to prevent the mating structure of the telescopic spring 401, the transmission ball 402, and the ball seat 403 from sliding out of the first mounting countersunk hole 2, the present application provides a mounting hole on the side wall of the mounting body 1, limits the sliding member 5 with the limiting pin 8, and by setting the size of the limiting hole and the limiting pin 8, the sliding member 5 can slide along the first direction without causing the first buffer member 4 to detach.

[0051] It is worth noting that the first direction in this application is the axial direction of the first mounting countersunk hole 2 in the mounting body 1, and the second direction is any direction perpendicular to the plane containing the first direction.

[0052] Furthermore, as a preferred embodiment of the present invention, the sliding member 5 in this application has at least two mounting grooves on the side opposite to the second buffer member 7. A driven ball 9 is rotatably disposed within each of the two mounting grooves, protruding from the mounting groove and abutting against the rolling ball 10. During the rolling process, the rolling ball 10 adheres to the surface of the workpiece and undergoes rolling pressing. To ensure the stable rolling of the rolling ball 10, the present application correspondingly provides driven balls 9. Through the rolling contact between the driven balls 9 and the rolling ball 10, the stable rolling of the rolling ball 10 on the workpiece surface is achieved. Preferably, the mounting grooves in this application are three, four, or other numbers, and multiple driven balls 9 form a bottom surface that rolls into contact with the rolling ball 10, allowing the rolling ball 10 to rotate stably.

[0053] Furthermore, as an optional embodiment of the present invention, abrasive material is also provided at the sliding gap between the fixing member 6 and the mounting body 1. Conventional rolling devices typically add abrasive material to the workpiece surface during the rolling process. Adding abrasive material is relatively convenient for planar workpieces, but for curved workpieces and fine-shaft threads with staggered crest and trough structures as described in this application, the abrasive material cannot be well retained on the workpiece surface, resulting in a workpiece with insufficient surface roughness. To address this problem, a portion of abrasive material can be added to the gap between the ball 10 and the driven ball 9 in this application. The abrasive material can be partially discharged from the through hole 11 as the ball 10 moves up and down, and simultaneously grinds the workpiece surface with the ball 10 to improve the surface roughness of the workpiece.

[0054] More preferably, the fixing member 6 in this application is covered at one end of the mounting body 1 where the first mounting countersunk hole 2 is opened. The end of the mounting body 1 facing the fixing member 6 has a cylindrical structure. The first buffer member 4, the second buffer member 7, the sliding member 5, the ball bearing 10, etc. are all arranged in the first mounting countersunk hole 2. The fixing member 6 has a cylindrical cover structure. The fixing member 6 is sleeved on the outer periphery of the mounting body 1, and a positioning pin is provided on the peripheral wall surface where the fixing member 6 connects with the mounting body 1. The fixing member 6 is stably covered on the mounting body 1 by the positioning pin.

[0055] Furthermore, the fixing member 6 in this application is a magnetic structure, and there is a magnetic attraction between the ball 10 and the fixing member 6. The ball 10 is made of steel, and the magnetic structure of the fixing member 6 gives it a certain magnetic attraction. Before the rolling device moves towards the workpiece and presses the ball 10 onto the workpiece surface, the ball 10 is in a free-fall state. To prevent the ball 10 from falling directly out of the through hole 11 and causing the rolling device to malfunction, this application sets the fixing member 6 as a magnetic structure, so that the ball 10 is attracted to the fixing member 6. The magnetic attraction between the ball 10 and the fixing member 6 is relatively small compared to the force applied during rolling. In the actual rolling process, the magnetic attraction between the fixing member 6 and the ball 10 does not affect the rolling process of the ball 10.

[0056] More preferably, the through hole 11 in this application has an inner wider and outer narrower structure, and the diameter of the ball 10 is not less than the opening diameter of the through hole 11. This application provides a corresponding outer diameter for the through hole 11 to prevent the ball 10 from falling off from the through hole 11 before the rolling device contacts the workpiece surface.

[0057] Preferably, the rolling device for machining fine shaft threads with a large length-to-diameter ratio in this application can be used for flexible rolling of both metallic and non-metallic materials. It is worth noting that the rolling device for machining fine shaft threads with a large length-to-diameter ratio in this application can be used in conjunction with cutting fluid during the rolling process to improve the surface rolling quality. The cutting fluid can be oil or coolant to protect the rolled surface from oxidation and improve the quality of the rolled surface.

[0058] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rolling device for machining fine shaft threads with a large length-to-diameter ratio, characterized in that, include: The mounting body has a drive component connected to one end and a first mounting countersunk hole formed at the other end. A first buffer, a sliding member, and a fixing member are arranged sequentially along a first direction inside the first mounting countersunk hole; The first buffer member has a buffer gap formed in the first mounting countersunk hole, so that the first buffer member can buffer compression and apply force to the sliding member; The sliding member is slidably disposed in the first mounting countersunk hole, the fixing member is connected to the mounting body, the fixing member and the sliding member are provided with a sliding gap along the first direction, and a ball bearing is provided in the sliding gap; The fastener has a through hole along the first direction, and the ball extends at least partially out of the through hole; A second mounting countersunk hole is provided inside the first mounting countersunk hole along the first direction, and the first mounting countersunk hole and the second mounting countersunk hole form a stepped surface; The first buffer is disposed in the second mounting countersunk hole, and the sliding member is disposed in the first mounting countersunk hole; The first buffer includes a telescopic spring, a transmission ball, and a ball seat arranged sequentially along a first direction; One end of the telescopic spring abuts against the bottom wall of the second mounting countersunk hole, and the other end abuts against the transmission ball. The ball seat has a placement hole on the side facing the transmission ball, and the transmission ball is placed in the placement hole. The ball seat is slidably disposed in the second mounting countersunk hole, and the side of the ball seat away from the transmission ball abuts against the sliding member; A second buffer is provided between the first buffer and the sliding member, and the second buffer is slidably disposed in the first mounting countersunk hole.

2. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to claim 1, characterized in that, The outer wall of the second buffer is attached to the inner wall of the first mounting countersunk hole. The second buffer can stretch and deform along the first direction. The elastic modulus of the second buffer along the first direction is greater than that of the first buffer along the first direction.

3. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to claim 1, characterized in that, The sliding member is slidably disposed in the first mounting countersunk hole. The sliding member has a limiting hole along the second direction. The mounting body has a mounting hole on its side wall. A limiting pin is provided at the mounting hole. The limiting pin is inserted into the limiting hole, and there is a gap between the limiting hole and the limiting pin along the first direction.

4. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to claim 3, characterized in that, The sliding member has at least two mounting slots on the side opposite to the second buffer member. A driven ball is rotatably disposed in the two mounting slots. The driven ball protrudes from the mounting slot and abuts against the ball.

5. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to claim 1, characterized in that, The fastener is mounted on the mounting body and sleeved around the outer periphery of the mounting body, and a positioning pin is provided between the fastener and the mounting body.

6. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to any one of claims 1 to 5, characterized in that, The fixing component is a magnetic structure, and there is a magnetic attraction between the ball and the fixing component.

7. The rolling device for machining fine shaft threads with a large length-to-diameter ratio according to any one of claims 1 to 5, characterized in that, The through hole has a structure that is wider inside and narrower outside, and the diameter of the ball is not less than the diameter of the opening of the through hole.

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