Mechanical strengthening device for inner wall surface of pipe

Abstract

This utility model discloses a mechanical strengthening device for the inner wall surface of a pipe, including a strengthening tool assembly and a machine tool body. The strengthening tool assembly includes a cutting head capable of penetrating deep into the pipe; the cutting head is configured to fit against the inner wall of the pipe, thereby generating a strain gradient on the inner wall surface. The machine tool body includes a feed assembly and a rotating assembly for mounting the pipe and driving the pipe to rotate around its axis. The feed assembly drives the strengthening tool assembly to feed along the axial direction of the pipe. In the mechanical strengthening device for the inner wall surface of the pipe provided in this application, the rotating assembly drives the pipe to rotate, and when the strengthening tool assembly feeds into the inner wall of the pipe, the cutting head acts on the inner wall of the pipe, causing a strain gradient to be generated on the inner wall surface. Therefore, the mechanical strengthening device for the inner wall surface of the pipe provided in this application achieves the strengthening of the inner wall of the pipe.

Description

Technical Field

[0001] This utility model relates to the field of metal surface processing technology, and in particular to a mechanical strengthening device for the inner wall surface of pipes. Background Technology

[0002] Surface mechanical strengthening technology has become a commonly used method for strengthening workpiece surfaces due to its minimal damage, uniform processing, and clean, pollution-free operation. Traditional surface mechanical strengthening techniques mainly include shot peening, deep rolling, surface mechanical compaction, and surface mechanical rolling.

[0003] However, the above surface mechanical strengthening techniques are all applicable to the outer surface of the workpiece. They cannot be used to strengthen the inner wall of hollow pipes, especially for some pipes with small inner diameters.

[0004] Therefore, how to strengthen the inner wall of pipe fittings is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical strengthening device for the inner wall surface of pipes to strengthen the inner wall of pipe fittings.

[0006] The mechanical strengthening device for the inner wall surface of pipes provided in this application includes:

[0007] A reinforced cutting tool assembly includes a cutting head capable of penetrating deep into the interior of the pipe; the cutting head is configured to conform to the inner wall of the pipe to create a strain gradient on the surface of the inner wall of the pipe.

[0008] The machine tool body is used to install the pipe fitting. The machine tool body includes a feed assembly and a rotating assembly that drives the pipe fitting to rotate around the pipe fitting axis. The feed assembly drives the strengthening tool assembly to feed along the pipe fitting axis.

[0009] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the strengthening tool assembly includes:

[0010] A first rolling element, the first rolling element being used to conform to the inner wall of the pipe fitting;

[0011] A rolling element mounting bracket is connected to the feed assembly. The rolling element mounting bracket has a rolling element mounting space for accommodating the first rolling element. At least three first rolling elements are arranged around the rolling element mounting space in a circumferential direction. The first rolling elements are capable of rolling in the rolling element mounting space.

[0012] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the rolling element mounting bracket includes:

[0013] The first limiting block has a first limiting surface that fits against the first rolling element;

[0014] The second limiting block is fixed relative to the first limiting block. The second limiting block is a hollow annular part. The surface of the second limiting block facing the first limiting block is the second limiting surface. The second limiting surface is in contact with the first rolling element.

[0015] Tool holder connecting block, the tool holder connecting block being connected to the feed assembly;

[0016] A loading center column is provided, with its first end fixedly connected to the tool holder connecting block and its other end passing through the second limiting block and fixedly connected to the first limiting block. The loading center column is provided with a third limiting surface that fits against the first rolling element. All the first rolling elements are circumferentially distributed around the outer periphery of the first rolling element. The first limiting surface, the second limiting surface and the third limiting surface enclose the rolling element installation space.

[0017] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the rolling element mounting bracket further includes a support column. The two opposite ends of the support column are respectively connected to the second limiting block and the tool holder connecting block. The second limiting block and the tool holder connecting block are detachably connected to the support column. The support column is a hollow column sleeved on the outside of the loading center column. The loading center column is detachably connected to the tool holder connecting block.

[0018] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe:

[0019] The third limiting surface is a tapered surface that gradually tapers towards the first limiting block;

[0020] The second limiting surface is a conical surface, and the inner circle of the second limiting surface is farther away from the first limiting block relative to the outer circle of the second limiting surface;

[0021] The outer periphery of the first limiting surface is provided with a limiting ring that protrudes in the direction close to the first limiting block and is used to limit the first rolling element.

[0022] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the rolling element mounting bracket further includes a retainer, the retainer being fixed relative to the second limiting block, and two adjacent first rolling elements being spaced apart by the retainer.

[0023] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the first limiting block is detachably connected to the loading center column.

[0024] Optionally, the above-mentioned mechanical strengthening device for the inner wall surface of the pipe further includes a pressure sensing component, which is installed at the end of the loading center column away from the first rolling element, and is used to sense the pressure applied by the first rolling element to the loading center column.

[0025] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the strengthening tool assembly includes:

[0026] A first connector is connected to the feed assembly, and the feed assembly drives the first connector to rotate about the axis of the first connector.

[0027] The second rolling element is mounted on the outer periphery of the first connector, and the outer peripheral surface of the second rolling element is in contact with the inner wall of the pipe. One or at least two second rolling elements are arranged along the axial direction of the first connector.

[0028] Optionally, in the above-mentioned mechanical strengthening device for the inner wall surface of the pipe, the strengthening tool assembly includes:

[0029] A second connector is connected to the feed assembly;

[0030] A reinforcing member is installed on the second connecting member, and the axis of the reinforcing member coincides with the axis of the second connecting member. Along the direction perpendicular to the feed direction of the reinforcing member, the cross-section of the front end of the reinforcing member is smaller than the inner wall of the pipe, and the cross-section of the reinforcing end face of the reinforcing member that is in contact with the inner wall of the pipe is larger than the inner wall of the pipe.

[0031] In the above technical solution, the mechanical strengthening device for the inner wall surface of pipes provided by this utility model includes a strengthening tool assembly and a machine tool body. The strengthening tool assembly includes a cutting head capable of penetrating deep into the pipe; the cutting head is configured to fit against the inner wall of the pipe to create a strain gradient on the inner wall surface. The machine tool body is used to mount the pipe and includes a feed assembly and a rotating assembly that drives the pipe to rotate around its axis. The feed assembly drives the strengthening tool assembly to feed along the axial direction of the pipe. When mechanical strengthening of the inner wall of the pipe is required, the pipe is mounted on the machine tool body, and the rotating assembly drives the pipe to rotate. The strengthening tool assembly is mounted on the feed assembly, and the feed assembly drives the strengthening tool assembly to feed along the axial direction of the pipe. The cutting head is configured to fit against the inner wall of the pipe to create a strain gradient on the inner wall surface. When the inner wall processing of the pipe is completed, the strengthening tool assembly is withdrawn from the pipe.

[0032] As described above, in the mechanical strengthening device for the inner wall surface of pipes provided in this application, the rotating assembly drives the pipe to rotate, and when the strengthening tool assembly feeds into the inner wall of the pipe, the tool head acts on the inner wall of the pipe, causing a strain gradient to be generated on the inner wall surface of the pipe. Therefore, the mechanical strengthening device for the inner wall surface of pipes provided in this application achieves the strengthening of the inner wall of the pipe. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 A schematic diagram of the structure of the first type of mechanical strengthening device for the inner wall surface of a pipe provided in an embodiment of this utility model;

[0035] Figure 2 A schematic diagram of the structure of the second type of mechanical strengthening device for the inner wall surface of a pipe provided in this embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of the first limiting block provided in an embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of the structure of the second limiting block provided in an embodiment of the present utility model;

[0038] Figure 5 This is a schematic diagram of the structure of the loading center column provided in an embodiment of the present utility model.

[0039] Figure 6 A schematic diagram of the structure of the third type of mechanical strengthening device for the inner wall surface of pipe provided in this embodiment of the utility model;

[0040] Figure 7 for Figure 6 A schematic diagram of the structure after the mechanical strengthening device on the inner wall surface of the pipe is fitted with the pipe fittings;

[0041] Figure 8 This is a schematic diagram of the structure of the reinforcing member provided in an embodiment of the present utility model;

[0042] Figure 9 A schematic diagram of the structure of the fourth type of mechanical strengthening device for the inner wall surface of pipe provided in this embodiment of the utility model;

[0043] Figure 10 for Figure 9 Side view of the mechanical strengthening device on the inner wall surface of the pipe shown.

[0044] in Figures 1 to 10 middle:

[0045] 1-First limiting block, 2-First rolling element, 3-Second limiting block, 4-Support column, 5-Tool holder connecting block, 6-Loading center column, 7-First connecting piece, 8-Notch, 9-Second rolling element, 10-Pipe fitting, 11-Reinforcing member, 12-Second connecting piece, 13-First limiting surface, 14-Second limiting surface, 15-Third limiting surface, 16-Limiting ring, 17-Helical groove. Detailed Implementation

[0046] The core of this utility model is to provide a mechanical strengthening device for the inner wall surface of pipes to strengthen the inner wall of pipe fittings.

[0047] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0048] Please refer to Figures 1 to 10 .

[0049] In one specific embodiment, the pipe inner wall surface mechanical strengthening device provided by this utility model includes a strengthening tool assembly and a machine tool body. To improve the automation effect of machining, preferably, the machine tool body is a CNC machine tool. During use, the pipe fitting 10 is fixed to the clamping system of the CNC machine tool body and rotates freely. The clamping system can be placed in the rotary output structure of the CNC machine tool to achieve clamping and free rotation of the pipe fitting 10. The strengthening tool assembly is suitable for surface mechanical strengthening of various small-sized pipe fittings 10. Specifically, the minimum inner wall diameter of the small-sized pipe fitting 10 being processed is 10mm.

[0050] The strengthening tool assembly includes a cutting head capable of penetrating deep into the interior of the tube 10. The cutting head is configured to conform to the inner wall of the tube 10, thereby creating a strain gradient on the surface of the inner wall of the tube 10. A machine body is used to mount the tube 10, wherein the machine body includes a feed assembly and a rotation assembly. The rotation assembly drives the tube 10 to rotate about its axis, and the feed assembly drives the strengthening tool assembly to feed along the axial direction of the tube 10.

[0051] When mechanical strengthening of the inner wall of the pipe is required, the pipe fitting 10 is mounted on the machine tool body, and the pipe fitting 10 is rotated by the rotating assembly. The strengthening tool assembly is mounted on the feed assembly, and the feed assembly drives the strengthening tool assembly to feed along the axial direction of the pipe fitting 10. The tool head is configured to fit against the inner wall of the pipe fitting 10, so that a strain gradient is generated on the surface of the inner wall of the pipe fitting 10, thereby refining the grains and generating surface strengthening through dislocation movement. The strain gradient generated on the surface of the inner wall of the pipe fitting 10 through the feeding of the strengthening tool achieves grain refinement and strength improvement through dislocation movement. When the inner wall processing of the pipe fitting 10 is completed, the strengthening tool assembly is withdrawn from the pipe fitting 10.

[0052] As described above, in the mechanical strengthening device for the inner wall surface of the pipe provided in the specific embodiment of this application, the rotating assembly drives the pipe 10 to rotate, and when the strengthening tool assembly feeds into the inner wall of the pipe 10, the tool head acts on the inner wall of the pipe 10, causing a strain gradient to be generated on the surface of the inner wall of the pipe 10. Therefore, the mechanical strengthening device for the inner wall surface of the pipe provided in this application achieves the strengthening of the inner wall of the pipe 10.

[0053] The reinforced cutting tool assembly includes a first rolling element 2 and a rolling element mounting bracket. The first rolling element 2 is used to fit against the inner wall of the pipe fitting 10 to reinforce the inner wall of the pipe fitting 10. The rolling element mounting bracket is provided with a rolling element mounting space to accommodate the first rolling element 2. In order to enable the first rolling element 2 to roll within the rolling element mounting space, the first rolling element 2 is preferably a ball.

[0054] The rolling element mounting bracket is connected to the feed assembly. The feed assembly drives the rolling element mounting bracket to move, which in turn drives the first rolling element 2 to feed. Specifically, this reinforced tool assembly is suitable for pipe fittings 10 with an inner wall size greater than 10mm.

[0055] In one specific embodiment, the rolling element mounting bracket includes a first limiting block 1, a second limiting block 3, a tool holder connecting block 5, and a loading center post 6, as shown below. Figure 3 As shown, the first limiting block 1 has a first limiting surface 13 that fits against the first rolling element 2. Specifically, the first limiting surface 13 can be a plane or composed of two surfaces arranged at an obtuse angle. The second limiting block 3 is fixed relative to the first limiting block 1. Specifically, the second limiting block 3 and the first limiting block 1 can be fixed to the tool holder connecting block 5 respectively.

[0056] When the first rolling element 2 is set, at least three first rolling elements 2 are arranged circumferentially around the rolling element mounting space, such as... Figure 1 and Figure 2As shown, three first rolling elements 2 form a three-ball cutter. To ensure that the first rolling elements 2 roll in a preset position, the rolling element mounting space has spherical grooves at both ends along the feed direction that fit one-to-one with the first rolling elements 2. This ensures that the first rolling elements 2 can only roll in the spherical groove positions. The three first rolling elements 2 ensure the overall force balance of the reinforced cutter assembly, guarantee coaxiality, and prevent the loading center column from bending during movement.

[0057] like Figure 4 As shown, the second limiting block 3 is a hollow annular component. For example, the second limiting block 3 has a cylindrical hole structure in the middle. The surface of the second limiting block 3 that faces the first limiting block 1 is the second limiting surface 14, which is in contact with the first rolling element 2. Specifically, the second limiting surface 14 can be a plane.

[0058] The tool holder connecting block 5 is connected to the feed assembly, wherein the tool holder connecting block 5 is preferably detachably connected to the feed assembly to facilitate the replacement of the corresponding reinforced tool assembly as needed.

[0059] like Figure 1 and Figure 2 As shown, the first end of the loading center post 6 is fixedly connected to the tool holder connecting block 5, and the other end passes through the second limiting block 3 and is fixedly connected to the first limiting block 1. For ease of assembly and disassembly, both the first limiting block 1 and the tool holder connecting block 5 are threadedly connected to the loading center post 6. To avoid interference, the loading center post 6 is clearance-fitted with the first limiting block 1 and the second limiting block 3.

[0060] like Figure 5 As shown, the loading center post 6 has a third limiting surface 15 that fits against the first rolling elements 2. All the first rolling elements 2 are circumferentially distributed around the outer periphery of the first rolling elements 2. The first limiting surface 13, the second limiting surface 14, and the third limiting surface 15 enclose a rolling element mounting space. During operation, the loading center post 6 holds the three first rolling elements 2 against each other, and the loading center post 6 loads all the first rolling elements 2, thereby strengthening the surface of the inner wall of the pipe fitting 10.

[0061] To extend the service life of the first rolling element 2, it is preferable that the material of the first rolling element 2 is hard alloy.

[0062] In one specific embodiment, the rolling element mounting bracket further includes a support column 4, with the opposite ends of the support column 4 respectively connected to a second limiting block 3 and a tool holder connecting block 5. Both the second limiting block 3 and the tool holder connecting block 5 are detachably connected to the support column 4. The support column 4 is a hollow column sleeved on the outside of the loading center column 6, and the loading center column 6 is detachably connected to the tool holder connecting block 5.

[0063] In one specific embodiment, the third limiting surface 15 is a tapered surface that tapers towards the first limiting block 1. The second limiting surface 14 is a tapered surface, and the inner ring of the second limiting surface 14 is farther away from the first limiting block 1 relative to the outer ring of the second limiting surface 14. In actual use, the tapered surface of the front section of the loading center column 6 is used to load the inner wall of the pipe fitting 10 by moving the loading center column 6.

[0064] A limiting ring 16 protruding from the outer periphery of the first limiting surface 13, near the first limiting block 1, is provided to limit the first rolling element 2. This arrangement prevents the first rolling element 2 from rolling out of the rolling element installation space.

[0065] In one specific embodiment, the rolling element mounting bracket further includes a retainer, which is fixed relative to the second limiting block 3, and two adjacent first rolling elements 2 are spaced apart by the retainer. Specifically, the surface of the retainer that contacts the first rolling element 2 is preferably a spherical surface adapted to the surface of the first rolling element 2.

[0066] In one specific embodiment, to facilitate the assembly and disassembly of the first rolling element 2, the first limiting block 1 is preferably detachably connected to the loading center column 6. For example, the first limiting block 1 is provided with an internal thread, and the loading center column 6 is provided with an external thread that mates with the internal thread.

[0067] During the assembly of the strengthening tool assembly, the first limiting block 1 is first loosened from the loading center post 6, thereby increasing the distance between the first limiting block 1 and the second limiting block 3. Three first rolling elements 2 are then added into the rolling element installation space, and the first rolling elements 2 are separated by a cage (not labeled in the figure). After the first rolling elements 2 are installed in place, the first limiting block 1 is moved towards the second limiting block 3 until the first limiting surface 13 and the second limiting surface 14 are both in contact with the first rolling elements 2. Next, the loading center post 6 is pushed in, and the loading center post 6 and the first limiting block 1 are gradually tightened, causing the first rolling elements 2 to be pressed into the inner wall surface of the pipe fitting 10 to be processed. By rotating the pipe fitting 10 to be processed and feeding the strengthening tool assembly, the surface mechanical strengthening of the inner wall of the pipe fitting 10 is achieved.

[0068] In one specific embodiment, the mechanical strengthening device for the inner wall surface of the pipe further includes a pressure sensing component. The pressure sensing component is installed at the end of the loading center column 6 away from the first rolling element 2. The pressure sensing component is used to sense the pressure applied by the first rolling element 2 to the loading center column 6. Specifically, the pressure sensing component includes a pressure sensor and a display connected to the pressure sensor. The pressure sensor is installed at the end of the loading center column 6 away from the first rolling element 2. By reading the pressure value measured by the pressure sensor on the display, it is determined whether the first rolling element 2 is in effective contact with the pipe fitting 10 and whether the loading center column 6 is properly installed.

[0069] like Figure 6 and Figure 7As shown, in one specific embodiment, the reinforced tool assembly includes a first connector 7 and a second rolling element 9. The first connector 7 is connected to a feed assembly, and the feed assembly drives the first connector 7 to rotate around its axis. Preferably, to facilitate replacement of the reinforced tool assembly, the first connector 7 is detachably connected to the feed assembly.

[0070] The second rolling element 9 is installed on the outer periphery of the first connecting member 7. Specifically, the second rolling element 9 is fixedly connected to the first connecting member 7. In order to improve the connection stability and assembly efficiency, the second rolling element 9 and the first connecting member 7 are preferably integrally formed.

[0071] like Figure 7 As shown, the outer peripheral surface of the second rolling element 9 is in contact with the inner wall of the pipe fitting 10.

[0072] like Figure 6 As shown, one or at least two second rolling elements 9 are arranged along the axis of the first connecting member 7. Specifically, the reinforced tool assembly, as a ball hob head, consists of multiple second rolling elements 9 arranged collinearly. In actual use, the reinforced tool assembly is driven to rotate freely by a built-in motor connected to the tool holder.

[0073] To extend the service life of the second rolling element 9, it is preferable that the second rolling element 9 is a rigid composite structure, specifically welded to the tool holder via the first connecting member 7. To facilitate the entry of the reinforced tool assembly into the pipe 10, it is preferable that the diameter of the tool holder's front end is smaller than the inner diameter of the pipe 10. The second rolling element 9 of the reinforced tool assembly contacts the pipe 10 on one side (the output shaft of the motor connected to the second rolling element 9 is collinear with the axis of the second rolling element 9, but not with the axis of the pipe 10). The front end of the reinforced tool assembly is pressed into one side of the pipe 10 by a CNC machine tool (the size of the reinforced tool assembly is required to be smaller than the inner diameter of the pipe 10). The inner diameter surface of the pipe 10 is rolled using the rotation of the motor and the CNC machine tool body. Specifically, the rotation of the CNC machine tool body drives the pipe 10 to rotate, and the reinforced tool assembly is fed under the action of the motor of the feed assembly. The second rolling element 9 is pressed into the inner wall of the pipe 10 to different depths to achieve different reinforcement effects. Due to the limitation of tool holder rigidity, this reinforced tool assembly is suitable for processing pipes 10 with shorter lengths.

[0074] like Figure 8 As shown, in one specific embodiment, the reinforced tool assembly includes a second connector 12 and a reinforcing member 11, with the second connector 12 connected to the feed assembly. The reinforcing member 11 is mounted on the second connector 12, and the axis of the reinforcing member 11 coincides with the axis of the second connector 12. The second connector 12 drives the reinforcing member 11 to feed along the axial direction of the inner wall of the tube 10.

[0075] Along the feed direction perpendicular to the reinforcing member 11, the cross-section of the front end of the reinforcing member 11 is smaller than that of the inner wall of the pipe fitting 10, while the cross-section of the reinforcing end face of the reinforcing member 11 that fits against the inner wall of the pipe fitting 10 is larger than that of the inner wall of the pipe fitting 10. Specifically, as follows... Figure 8 As shown, the reinforcing member 11 is a ball notch cutter head with a notch 8. Specifically, multiple notches 8 are provided to facilitate the reinforcing member 11 entering the interior of the pipe fitting 10.

[0076] In specific design, to avoid stress concentration, it is preferable that the corner of the notch 8 has a smooth transition, the depth of the notch 8 is greater than 0.3 mm, and the notch transition angle is greater than 120°, where the notch transition angle is the included angle formed by the notch 8 with respect to the two sides. The diameter of the reinforcing member 11 is the inner diameter of the pipe 10 + 0.05-0.2 mm.

[0077] In practical use, the tube 10 is clamped and rotated by the rotation output structure of the CNC machine tool body (the output shaft of the motor, the axis of the reinforcing member 11 and the axis of the tube 10 are collinear). The reinforcing member 11 is used for feeding, and the notch 8 position of the reinforcing member 11 generates local micro-rolling on the surface of the tube 10 to form a strain gradient, thereby achieving surface mechanical strengthening.

[0078] In one specific implementation, such as Figure 9 and Figure 10 As shown, the reinforcing member 11 is a spiral cutter head, which is a type of spiral drill bit. The front end of the spiral cutter head has a spirally arranged spiral groove 17, and the end of the spiral groove 17 is located at the foremost point of the reinforcing member 11 in the feed direction. The reinforcing member 11 is made by electrolytically polishing the drill bit to remove the sharp edges. When selecting a spiral cutter head, the diameter of the spiral cutter head is 0.05 mm to 0.1 mm larger than the inner wall diameter of the pipe fitting 10.

[0079] In practical applications, spherical segment cutters and spiral cutters are preferably suitable for pipe fittings with an inner wall size of less than 10 mm.

[0080] The mechanical strengthening device for the inner wall surface of pipes provided in this application is simple to operate, highly automated, and can achieve uniform strengthening of the inner wall of some smaller pipe fittings. It is environmentally friendly and clean, and is easy to promote and use widely.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical strengthening device for the inner wall surface of a pipe, characterized in that, include: A reinforced cutting tool assembly, the reinforced cutting tool assembly including a cutting head capable of penetrating deep into the interior of the tube (10); The cutting head is configured to fit against the inner wall of the pipe fitting (10) so that a strain gradient is generated on the inner wall surface of the pipe fitting (10); The machine tool body is used to install the pipe fitting (10). The machine tool body includes a feed assembly and a rotating assembly that drives the pipe fitting (10) to rotate around the axis of the pipe fitting (10). The feed assembly drives the strengthening tool assembly to feed along the axis of the pipe fitting (10).

2. The mechanical strengthening device for the inner wall surface of the pipe according to claim 1, characterized in that, The reinforced cutting tool assembly includes: The first rolling element (2) is used to fit against the inner wall of the pipe fitting (10); A rolling element mounting frame is connected to the feed assembly. The rolling element mounting frame has a rolling element mounting space for accommodating the first rolling element (2). At least three first rolling elements (2) are arranged around the rolling element mounting space. The first rolling elements (2) can roll in the rolling element mounting space.

3. The mechanical strengthening device for the inner wall surface of the pipe according to claim 2, characterized in that, The rolling element mounting bracket includes: The first limiting block (1) has a first limiting surface (13) that fits against the first rolling body (2); The second limiting block (3) is fixed relative to the first limiting block (1). The second limiting block (3) is a hollow ring. The surface of the second limiting block (3) facing the first limiting block (1) is the second limiting surface (14). The second limiting surface (14) is in contact with the first rolling body (2). Tool holder connecting block (5), which is connected to the feed assembly; A loading center column (6) is provided. The first end of the loading center column (6) is fixedly connected to the tool holder connecting block (5), and the other end passes through the second limiting block (3) and is fixedly connected to the first limiting block (1). The loading center column (6) is provided with a third limiting surface (15) that fits against the first rolling body (2). All the first rolling bodies (2) are circumferentially distributed around the outer periphery of the first rolling body (2). The first limiting surface (13), the second limiting surface (14) and the third limiting surface (15) enclose the rolling body installation space.

4. The mechanical strengthening device for the inner wall surface of the pipe according to claim 3, characterized in that, The rolling element mounting bracket also includes a support column (4), with the second limiting block (3) and the tool holder connecting block (5) respectively connected to opposite ends of the support column (4). The second limiting block (3) and the tool holder connecting block (5) are detachably connected to the support column (4). The support column (4) is a hollow column sleeved on the outside of the loading center column (6). The loading center column (6) is detachably connected to the tool holder connecting block (5).

5. The mechanical strengthening device for the inner wall surface of the pipe according to claim 4, characterized in that: The third limiting surface (15) is a tapered surface that gradually narrows in the direction of the first limiting block (1); The second limiting surface (14) is a conical surface, and the inner circle of the second limiting surface (14) is far away from the first limiting block (1) relative to the outer circle of the second limiting surface (14); The outer periphery of the first limiting surface (13) is provided with a limiting ring (16) that protrudes in the direction close to the first limiting block (1) and is used to limit the first rolling body (2).

6. The mechanical strengthening device for the inner wall surface of the pipe according to claim 3, characterized in that, The rolling element mounting bracket also includes a retainer, which is fixed relative to the second limiting block (3), and two adjacent first rolling elements (2) are spaced apart by the retainer.

7. The mechanical strengthening device for the inner wall surface of the pipe according to claim 3, characterized in that, The first limiting block (1) is detachably connected to the loading center column (6).

8. The mechanical strengthening device for the inner wall surface of the pipe according to claim 3, characterized in that, It also includes a pressure sensing component, which is installed at the end of the loading center column (6) away from the first rolling element (2), and the pressure sensing component is used to sense the pressure applied by the first rolling element (2) to the loading center column (6).

9. The mechanical strengthening device for the inner wall surface of a pipe according to claim 1, characterized in that, The reinforced cutting tool assembly includes: A first connector (7) is connected to the feed assembly, and the feed assembly drives the first connector (7) to rotate around the axis of the first connector (7); The second rolling element (9) is installed on the outer periphery of the first connector (7), and the outer periphery of the second rolling element (9) is in contact with the inner wall of the pipe (10). One or at least two second rolling elements (9) are arranged along the axial direction of the first connector (7).

10. The mechanical strengthening device for the inner wall surface of a pipe according to claim 1, characterized in that, The reinforced cutting tool assembly includes: The second connector (12) is connected to the feed assembly; A reinforcing member (11) is installed on the second connecting member (12), and the axis of the reinforcing member (11) coincides with the axis of the second connecting member (12). Along the feed direction perpendicular to the reinforcing member (11), the cross-section of the front end of the reinforcing member (11) is smaller than the inner wall of the pipe fitting (10), and the cross-section of the reinforcing end face of the reinforcing member (11) that is in contact with the inner wall of the pipe fitting (10) is larger than the inner wall of the pipe fitting (10).

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