A universal roller tool head and a roller tool for surface mechanical roller processing

Abstract

The application discloses a universal rolling tool head and rolling tool which can be used for surface mechanical rolling processing. The universal rolling tool head comprises a large ball, an end cover, a polytetrafluoroethylene gasket, a ball retainer, a small ball, a ball socket and a mounting piece. A rolling tool is also provided, which comprises the universal rolling tool head with the mounting piece provided with a fourth through hole on a side face, and a hexagonal socket head cap screw and a double-ear type piston rod. Another rolling tool is also provided, which comprises the universal rolling tool head with the mounting piece provided with a third external thread on a bottom, and a threaded type piston rod. The split design idea is adopted, the part position is accurately controlled through different limiting steps and thread structures, convenient disassembly is realized, the end cover and the ball socket which are vulnerable parts can be independently processed, and the maintenance cost is greatly reduced, the adjustable ball socket design effectively makes up for the defects of insufficient machining accuracy, and the practicability and reliability of the device are further improved.

Description

Technical Field

[0001] This invention belongs to the field of mechanical rolling processing technology for metal material surfaces, and particularly relates to a universal rolling cutter head and rolling tool that can be used for mechanical rolling processing of surfaces. Background Technology

[0002] Gradient nanostructured materials, through their unique gradient structure distribution, can effectively reconcile the contradictory relationship of strength-plasticity inversion inherent in traditional nanomaterials, significantly improving their plastic deformation capacity while maintaining the high strength properties of nanocrystalline materials. They are typically prepared using surface plastic deformation techniques, primarily including surface mechanical grinding, surface mechanical rolling, and surface mechanical rolling. Surface mechanical rolling involves pressing a cemented carbide spherical indenter into the material surface, causing the indenter to roll continuously. This continuous rolling of the indenter induces severe plastic deformation in the material surface layer, thereby forming a continuous gradient structure layer.

[0003] A swivel ball bearing is a type of bearing that can rotate freely in multiple directions. It is commonly used in applications requiring multi-degree-of-freedom motion for support or guidance, such as logistics and transportation systems, rotary tables, and heavy equipment. Unlike traditional ball bearings, which primarily transmit loads in a single or specific direction, swivel ball bearings can typically allow objects to slide or be supported in any direction on a horizontal plane. A swivel ball bearing usually consists of a housing, support balls, small balls, and a cage.

[0004] Patent CN202410792411.2 discloses an integrated milling and turning intelligent roller burnishing tool, which comprises a roller burnishing head composed of rolling balls and a roller burnishing ball head. In use, the roller burnishing ball head directly contacts the concave rolling balls and the end cap rolling balls. The concave rolling balls and the end cap rolling balls assist the roller burnishing ball head in rolling in any direction. Lubricating oil enters the large spherical concave cavity through the oil guide hole, further assisting the roller balls in rolling in any direction during the roller burnishing process, thus enabling the roller burnishing head to achieve this.

[0005] Patent CN202311819479.7 discloses a processing device and method for symmetrical gradient nanostructured flat plates. This patent proposes a rolling tool composed of a cemented carbide ball, a cutting tool body, a first end cap, and a rolling support steel ball. The cutting tool body has a limiting hole in which the cemented carbide ball is placed. A rolling support steel ball is disposed inside the cutting tool body, contacting the cemented carbide ball through the limiting hole, allowing it to roll freely during processing while reducing frictional resistance.

[0006] The rolling head of the rolling device is usually kept rolling by cooperating with its internal rolling elements. When performing surface mechanical rolling on the sample, it is necessary to keep the ball head of the rolling tool in rolling frictional contact with the sample at all times.

[0007] Currently, some rolling devices use deep groove ball bearings and thrust ball bearings as the rolling elements of the rolling cutter. Although these bearings can withstand large forces, they can only roll in a single plane. This inevitably leads to sliding friction between the ball head of the rolling tool and the sample during the rolling process, thus affecting the rolling quality. In addition, some rolling devices use small balls as the rolling elements of the rolling cutter. These allow the ball head to rotate freely in multiple directions and can adapt to complex sample surface conditions. However, when the rolling pressure is high, the rolling of the small balls may become stuck, affecting the rolling of the ball head and causing sliding friction between the ball head and the sample, thus affecting the rolling quality. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a universal rolling cutter head and rolling tool that can be used for surface mechanical rolling.

[0009] The objective of this invention is achieved through the following technical solution: a universal rolling head for surface mechanical rolling, comprising: a large ball, an end cap, a polytetrafluoroethylene gasket, a ball cage, a small ball, a ball socket, and a mounting component; The outer side of the end cap is arc-shaped; the inner side of the end cap is provided with a first stepped structure and a first internal thread; the top of the end cap has a small hole smaller than the diameter of the large ball; a polytetrafluoroethylene gasket is installed on the first layer of the first stepped structure, and a second through hole is provided in the middle of the polytetrafluoroethylene gasket. The mounting component has a second external thread at its top, which is used to connect with a first internal thread. The mounting component has a second stepped structure inside, with a curved surface below the second stepped structure. A first through hole is located at the bottom of the curved surface, and a second internal thread of a certain length is provided on the surface of the first through hole. A ball retainer is installed on the first layer of the second stepped structure, and a third through hole is provided in the middle of the ball retainer. The large ball is located within the second and third through holes. The ball socket is divided into an upper part and an extension rod. A first external thread is provided on the extension rod. The first external thread is used to connect with the second internal thread, allowing the ball socket to be inserted into the first through hole of the mounting component. The length of the extension rod is less than the length of the second internal thread. A slotted screw hole is located at the bottom of the extension rod. Small balls fill the gap between the lower surface of the upper part of the ball socket and the mounting component. Small balls cover the upper surface of the upper part of the ball socket. The small balls on the upper surface of the upper part of the ball socket contact the large ball.

[0010] Furthermore, both the large and small ball bearings are made of cemented carbide tungsten carbide steel.

[0011] Furthermore, the end cap is provided with a cross section that mates with a wrench.

[0012] Furthermore, a fourth through hole is also provided on the side of the mounting component.

[0013] Furthermore, the bottom of the mounting component also has a third external thread.

[0014] The present invention also provides a rolling tool, including the universal rolling cutter head for surface mechanical rolling, an internal hex bolt, and a double-ear piston rod; the two ends of the double-ear piston rod are respectively provided with lugs, each lug having a threaded through hole; the internal hex bolt passes through the threaded through hole on one lug, a fourth through hole, and the threaded through hole on the other lug in sequence and is fixedly connected; the bottom of the mounting part contacts the top of the double-ear piston rod.

[0015] The present invention also provides a rolling tool, including the universal rolling cutter head for surface mechanical rolling and an internally threaded piston rod; the internally threaded piston rod has a third internal thread inside; and is connected to the third internal thread through a third external thread.

[0016] The beneficial effects of this invention are: 1) The large ball bearing can rotate freely within a 360-degree range, adapting to rapid changes in load and direction of motion. The friction generated by the rolling of the ball bearing is much less than that of sliding friction, reducing frictional resistance during processing and avoiding surface damage or scratches that may be caused by sliding friction, thus obtaining better workpiece surface quality; it allows the large ball bearing to move smoothly on workpieces with complex curved surfaces, making it suitable for surface processing of various geometries. 2) The unique ball socket and the internal shape of the mounting component, as well as the arc-shaped surface design of the top of the ball cage, allow the small balls to "flow" smoothly like water during the processing; this design effectively avoids the "jamming" phenomenon that may occur in the small balls, and improves the stability and efficiency of the processing. 3) The extension rod of the ball socket is provided with a first external thread and a slotted screw hole, which are used to provide fine adjustment capability when the machining accuracy of the ball socket and the mounting part is insufficient; by using a miniature slotted screwdriver, the screwdriver bit at the bottom of the ball socket extension rod is inserted from the small hole at the bottom of the mounting part and rotated to adjust the up and down position of the ball socket, so as to achieve a reasonable installation position, ensuring assembly accuracy and use effect; 4) The PTFE gasket can prevent the large ball bearing from directly contacting the end cap due to tangential force during processing, thus avoiding a "hard-on-hard" phenomenon and extending the service life of the large ball bearing and the end cap; at the same time, the PTFE gasket also provides positioning, sealing and axial buffering functions. 5) The rolling tool adopts a split design concept, which precisely controls the position of the parts through different limiting steps and thread structure, and realizes convenient disassembly; vulnerable parts such as end caps and ball sockets can be processed independently, which further reduces maintenance costs; the adjustable ball socket design effectively makes up for the defects of insufficient processing accuracy, and further improves the practicality and reliability of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a universal rolling cutter head that can be used for surface mechanical rolling in Example 1; Figure 2 This is a vertical cross-sectional view of a universal rolling cutter head that can be used for surface mechanical rolling in Example 1; Figure 3 This is a schematic diagram of the vertical cross-section of the end cap in Example 1; Figure 4 This is a schematic diagram of the vertical cross-section of the ball cage in Example 1; Figure 5 This is a schematic diagram of the structure of the ball-and-socket joint in Example 1; Figure 6 This is a schematic diagram of the vertical cross-section of the ball socket in Example 1; Figure 7 This is a vertical cross-sectional view of the mounting component in Example 2; Figure 8 This is a schematic diagram of the vertical cross-section of the double-eared piston rod in Example 3; Figure 9 This is a schematic diagram of the vertical cross-section of the rolling tool in Example 3; Figure 10 This is a schematic diagram of the rolling tool in Example 3; Figure 11 This is a schematic diagram of the installation of the rolling tool in the rolling device in Example 3; Figure 12 This is a vertical cross-sectional view of the mounting component in Example 4; Figure 13 This is a vertical cross-sectional view of a universal rolling cutter head that can be used for surface mechanical rolling in Example 4; Figure 14 This is a schematic diagram of the vertical cross-section of the internally threaded piston rod in Example 5; Figure 15 This is a schematic diagram of the rolling tool in Example 5; Figure 16 This is a side view of the vertical cross-sectional structure of the rolling tool in Example 5; In the diagram, 1-large ball bearing; 2-end cap; 3-PTFE gasket; 4-ball bearing cage; 5-small ball bearing; 6-ball socket; 7-hexagon socket head cap screw; 8-mounting part; 21-first stepped structure; 22-first internal thread; 31-second through hole; 41-third through hole; 60-upper part; 61-extension rod; 62-first external thread; 63-slotted screw hole; 810-second external thread; 811-second stepped structure; 812-curved surface structure; 813-second internal thread; 814-fourth through hole; 815-first through hole; 825-third external thread; 91-double-ear piston rod; 911-threaded through hole; 92-internal thread type piston rod; 921-third internal thread; 100-piston cylinder. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0019] Example 1: As Figure 1 and Figure 2 As shown, the present invention provides a universal rolling head that can be used for surface mechanical rolling processing, comprising: a large ball 1, an end cap 2, a polytetrafluoroethylene gasket 3, a ball retainer 4, a small ball 5, a ball socket 6, and a mounting component 8.

[0020] like Figure 3 As shown, the outer surface of the end cap 2 is arc-shaped, which effectively enhances the lateral load-bearing capacity. The interior of the end cap 2 has a first stepped structure 21 and a first internal thread 22; the top of the end cap 2 has a small hole smaller than the diameter of the large ball bearing 1 to prevent it from falling out. The first stepped structure 21 is used to install a polytetrafluoroethylene (PTFE) gasket 3, and the PTFE gasket 3 is installed on the first layer of the first stepped structure 21; the PTFE gasket 3 has a second through hole 31 in the middle; the first internal thread 22 is used to mate with the second external thread 810 of the mounting part 8 to achieve a detachable connection, improve loading and unloading efficiency, allow for frequent replacement of the large ball bearing 1, and ensure the quality of the rolling process.

[0021] The PTFE gasket 3 wraps around the large ball bearing 1. During the roll forming process, the large ball bearing 1 is subjected to tangential forces, causing it to directly contact the end cap 2. The PTFE gasket 3 provides a buffering effect, preventing a direct contact between the large ball bearing 1 and the end cap 2. This reduces rolling friction between the large ball bearing 1 and the sample during roll forming, improving the quality of the roll forming process and extending the service life of both the end cap 2 and the large ball bearing 1. Simultaneously, the PTFE gasket 3 also positions the large ball bearing 1. Furthermore, the PTFE gasket 3 provides positioning, sealing, and axial buffering for the large ball bearing 1.

[0022] like Figure 7 As shown, the top of the mounting component 8 has a second external thread 810, which is used to connect with the first internal thread 22. This facilitates easy assembly and disassembly, allowing for frequent replacement of the large ball bearing 1, thus ensuring the quality of the rolled sample. The mounting component 8 has a second stepped structure 811 inside. Below the second stepped structure 811 is a curved surface structure 812. The bottom of the curved surface structure 812 has a first through hole 815, and the surface of the first through hole 815 is provided with a second internal thread 813 of a certain length. A ball retainer 4 is installed on the first layer of the second stepped structure 811, and a third through hole 41 is provided in the middle of the ball retainer 4. The large ball bearing 1 is located within the second through hole 31 and the third through hole 41.

[0023] like Figure 5 and Figure 6 As shown, the ball socket 6 is divided into an upper part 60 and an extension rod 61; the extension rod 61 is provided with a first external thread 62. The first external thread 62 on the extension rod 61 of the ball socket 6 is used to connect with the second internal thread 813 at the bottom of the mounting part 8, so as to insert the ball socket 6 into the first through hole 815 of the mounting part 8; the length of the extension rod 61 is less than the length of the second internal thread 813. A flathead screw hole 63 is opened at the bottom of the extension rod 61. When assembling with the ball socket 6, a miniature flathead screwdriver can be inserted into the first through hole 815, and the vertical position of the ball socket 6 can be finely adjusted by turning the flathead screw hole 63 at the bottom of the extension rod 61. This can avoid the problem of the assembly gap between the ball socket 6 and the mounting part 8 being too small due to machining accuracy issues. During installation, firstly, the ball socket 6 is connected to the second internal thread 813 by rotating the first external thread 62, that is, the ball socket 6 is inserted into the first through hole 815 of the mounting part 8. Then, small balls 5 are filled into the gap between the lower surface of the upper half 60 of the ball socket 6 and the mounting part 8. The size of the gap should be such that the small balls 5 can roll freely inside. Then, small balls 5 are laid on the upper surface of the upper half 60 of the ball socket 6. The small balls 5 on the upper surface of the upper half 60 of the ball socket 6 are in contact with the large balls 1. The size of the gap can be finely adjusted by using a miniature flathead screwdriver to adjust the vertical position of the ball socket 6.

[0024] To avoid manufacturing errors in the ball socket 6 that could affect the size of the gap and the rolling of the balls, a miniature flathead screwdriver is used to insert into the pre-drilled flathead screw hole 63 at the bottom of the extension rod 61 of the ball socket 6 through the first through hole 815 at the bottom of the mounting part 8 for fine-tuning. This ensures that the small ball 5 on the upper surface of the upper half 60 of the ball socket 6 is in direct contact with the large ball 1, lifting the large ball 1 while allowing the small ball 5 to roll smoothly without getting stuck in the gap between the lower surface of the upper half 60 of the ball socket 6 and the mounting part 8.

[0025] like Figure 4 As shown, the ball retainer 4 has a third through hole 41 in the middle for contact between the large ball 1 and the small ball 5. The ball retainer 4 is placed in the first layer of the second-step structure 811 of the mounting component 8. The large ball 1 is placed in the ball retainer 4 and contacts the small ball 5 placed in the ball socket 6. This contact method of the large ball is a point contact, which results in less friction and increases the number of contact points, preventing excessive stress on the contact points from causing structural damage. The lower part of the ball retainer 4 adopts an arc transition connection to ensure smooth rolling of the small ball 5 and avoid the phenomenon that the small ball gets stuck between the ball retainer 4 and the ball socket 2 during the rolling process, thus preventing the large ball 1 from rolling. The gap between the ball retainer 4 and the mounting component 8 is filled with lubricating oil, which plays an auxiliary lubrication role during the rolling of the small ball 5. The unique internal shape of the ball socket 6 and the mounting part 8, as well as the rounded transition at the bottom of the ball cage 4, allows the small balls 5 to "flow" between them like water during processing, thus avoiding the possibility of the small balls 5 "getting stuck" and causing the large balls 1 to be unable to roll. The gap between the ball cage 4 and the mounting part 8 is filled with lubricating oil, which plays an auxiliary role in the "flow" of the small balls.

[0026] Example 1 provides a specific installation process for a universal rolling cutter head that can be used for surface mechanical rolling: The ball socket 6 is inserted into the mounting member 8 by connecting the second internal thread 813 on the surface of the first through hole 815 to the first external thread 62 on the extension rod 61 of the ball socket 6; small balls 5 are filled in the gap between the lower surface of the upper half 60 of the ball socket 6 and the mounting member 8; small balls 5 are laid on the upper surface of the upper half 60 of the ball socket 6; the ball retainer 4 is placed in the first layer of the second stepped structure 811 of the mounting member 8; then the large ball 1 is placed, and the large ball 1 passes through the ball retainer. The third through hole 41 in the holder 4 contacts the small ball 5 on the upper surface of the upper half 60 of the ball socket 6; then the polytetrafluoroethylene gasket 3 is placed in the first layer of the first stepped structure 21 of the end cap 2; finally, the end cap 2 with the polytetrafluoroethylene gasket 3 is screwed into the mounting part 8 through the first internal thread 22 and the second external thread 810, and the second through hole 31 in the polytetrafluoroethylene gasket 3 passes through the large ball 1, thus completing the installation of a universal rolling cutter head that can be used for surface mechanical rolling.

[0027] Both the large ball 1 and the small ball 5 are made of cemented carbide tungsten carbide steel balls. Cemented carbide tungsten carbide steel balls have high hardness, low coefficient of friction, strong wear resistance, and good toughness, thus effectively improving processing quality and tool life.

[0028] The end cap 2 is equipped with a cross-section that mates with a wrench, allowing for easy tightening with a wrench when the end cap 2 is screwed into the mounting part 8, preventing the end cap 2 from falling off during the rolling process and causing injury to the operator. Embodiments of the present invention also provide two rolling tools, including the aforementioned universal rolling cutter head and piston rod, the piston rod being slidably connected to the piston cylinder of the rolling device.

[0029] The first type of rolling tool utilizes the fourth through hole 814 on the side of the mounting part 8 to connect to the double-eared threaded hole at the top of the piston rod using an internal hex bolt.

[0030] The second type of rolling tool is connected to the internal thread at the top of the piston rod via the third external thread 825 at the bottom of the mounting part 8.

[0031] Example 2: As Figure 7 As shown, based on Embodiment 1, the mounting component 8 also has a fourth through hole 814 on its side.

[0032] Example 3: As Figure 9 and Figure 10 As shown, the present invention also provides a rolling tool, including the universal rolling cutter head mentioned in Embodiment 2 that can be used for surface mechanical rolling, as well as an internal hex bolt 7 and a double-eared piston rod 91.

[0033] The double-eared piston rod 91 can be installed inside the piston cylinder 100 of the rolling device, such as... Figure 11As shown, the rotation of the lathe spindle drives the rotation of the rolling sample. The pressure output by the rolling device is evenly applied to the bottom of the double-ear piston rod 91, thereby achieving contact between the large ball 1 and the rolling sample. When the rolling device runs at a constant speed along the sample axis, the rolling process can be realized.

[0034] like Figure 8 As shown, the two ends of the double-ear piston rod 91 are respectively provided with ear plates, and each ear plate is provided with a threaded through hole 911; the internal hex bolt 7 passes through the threaded through hole on one ear plate, the fourth through hole 814 and the threaded through hole on the other ear plate in sequence and is fixedly connected; the bottom of the mounting part 8 contacts the top of the double-ear piston rod 91.

[0035] During installation, place the lugs at both ends of the double-ear piston rod on both sides of the mounting part 8, aligning the threaded through holes 911 on the lugs with the fourth through hole 814 on the side of the mounting part 8. Then, pass the internal hex bolts 7 through the threaded through hole, the fourth through hole and the threaded through hole on one lug in sequence, and tighten the nuts at the other end.

[0036] During the roll forming process on samples with large axial undulations, the "double-ear" structure design of the double-ear piston rod 91 can largely resist the axial force on the roll forming cutter head, thus ensuring good surface finish. Simultaneously, the contact between the bottom of the mounting part 8 and the top of the double-ear piston rod 91 effectively resists the tangential force on the roll forming cutter head.

[0037] Example 4: Figure 12 and Figure 13 As shown, based on Embodiment 1, the bottom of the mounting component 8 is further provided with a third external thread 825.

[0038] Example 5: A rolling tool, comprising the universal rolling cutter head mentioned in Example 3 that can be used for surface mechanical rolling and an internal thread type piston rod 92.

[0039] like Figure 14 , Figure 15 and Figure 16 As shown, the internally threaded piston rod 92 has a third internal thread 921 inside; it is connected to the third internal thread 921 through the third external thread 825, that is, the mounting part 8 and the internally threaded piston rod 92 are connected by a threaded connection. Specifically, the screw-type mounting part 812 and the six-sided structure on the side of the internally threaded piston rod 92 are used to tighten them by applying force in opposite directions with two external hex wrenches.

[0040] Example 5 differs from Example 3. The connection method used in Example 5 can effectively avoid the overall assembly quality decline due to the processing errors of each part, which in turn leads to the problem of declining rolling processing quality.

[0041] The internally threaded piston rod can also be installed in the piston cylinder of the rolling device. The pressure output by the rolling device is evenly applied to the bottom of the internally threaded piston rod 92, thereby achieving contact between the large ball 1 and the rolling sample. When the rolling device moves at a constant speed under the drive of the servo motor, the rolling process on the sample surface can be completed.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., 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 universal roller burnishing head for surface mechanical roller burnishing, characterized in that, include: Large ball (1), end cap (2), PTFE gasket (3), ball retainer (4), small ball (5), ball socket (6) and mounting component (8); The outer part of the end cap (2) is arc-shaped; the inner part of the end cap (2) is provided with a first stepped structure (21) and a first internal thread (22); the top of the end cap (2) has a small hole with a diameter smaller than that of the large ball (1); a polytetrafluoroethylene gasket (3) is installed on the first layer of the first stepped structure (21), and a second through hole (31) is provided in the middle of the polytetrafluoroethylene gasket (3). The top of the mounting component (8) has a second external thread (810), which is used to connect with the first internal thread (22); the interior of the mounting component (8) has a second stepped structure (811), and below the second stepped structure (811) is a curved structure (812). The bottom of the curved structure (812) has a first through hole (815), and the surface of the first through hole (815) is provided with a second internal thread (813) of a certain length; a ball retainer (4) is installed on the first layer of the second stepped structure (811), and a third through hole (41) is provided in the middle of the ball retainer (4); the large ball (1) is located in the second through hole (31) and the third through hole (41); the ball socket (6) is divided into The upper part (60) and the extension rod (61); the extension rod (61) is provided with a first external thread (62); the first external thread (62) is used to connect with the second internal thread (813) to realize the insertion of the ball socket (6) into the first through hole (815) of the mounting part (8); the length of the extension rod (61) is less than the length of the second internal thread (813); a slotted screw hole (63) is opened at the bottom of the extension rod (61); the gap between the lower surface of the upper part (60) of the ball socket (6) and the mounting part (8) is filled with small balls (5); the upper surface of the upper part (60) of the ball socket (6) is covered with small balls (5); the small balls (5) on the upper surface of the upper part (60) of the ball socket (6) are in contact with the large balls (1).

2. The universal rolling head for surface mechanical rolling as described in claim 1, characterized in that, Both the large ball (1) and the small ball (5) are made of hard alloy tungsten carbide steel balls.

3. A universal rolling head for surface mechanical rolling as described in claim 1, characterized in that, The end cap (2) is provided with a cross section that mates with a wrench.

4. A universal rolling head for surface mechanical rolling as described in claim 1, characterized in that, The mounting component (8) also has a fourth through hole (814) on its side.

5. A universal rolling head for surface mechanical rolling as described in claim 1, characterized in that, The bottom of the mounting component (8) is also provided with a third external thread (825).

6. A rolling tool, characterized in that, Includes the universal rolling cutter head for surface mechanical rolling as described in claim 4, as well as the hexagon socket head cap screw (7) and the double-ear piston rod (91); the two ends of the double-ear piston rod (91) are respectively provided with ear plates, and each ear plate is provided with a threaded through hole (911); the hexagon socket head cap screw (7) passes through the threaded through hole on one ear plate, the fourth through hole (814) and the threaded through hole on the other ear plate in sequence and is fixedly connected; the bottom of the mounting part (8) contacts the top of the double-ear piston rod (91).

7. A rolling tool, characterized in that, It includes the universal rolling cutter head for surface mechanical rolling as described in claim 5 and the internally threaded piston rod (92); the internally threaded piston rod (92) is provided with a third internal thread (921); and is connected to the third internal thread (921) through a third external thread (825).

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