Rolling strengthening device for inner hole surface treatment

Abstract

The utility model provides a rolling strengthening device for inner hole surface treatment, which comprises a rolling device mounted on a tailstock of a machine tool, the rolling device and a workpiece fixed on a chuck of the machine tool are coaxially arranged, and at least one sliding support seat is arranged between the rolling device and a sliding rail of the machine tool; a fixing base moving in the radial direction is arranged at the end of the shell supporting assembly, and a rotating roller is arranged in the fixing base and abuts against the inner wall of the workpiece. A driving head is fixedly arranged at the end of the internal driving assembly, a plurality of wedge blocks are arranged on the outer side of one end of the driving head, a guide groove is formed in one side of each wedge block, an inclined groove is formed in the bottom of the fixing base, the fixing base abuts against the inclined faces of the wedge blocks through the inclined groove to slide, a through hole is formed in one side of the inclined groove, and a pin shaft is fixedly arranged in the through hole and abuts against the interior of the guide groove to slide. The rolling strengthening device not only can effectively improve the quality and mechanical performance of the surface of the inner hole of the workpiece, but also has the advantages of being high in precision, automatic, flexible, easy to maintain and the like, and is suitable for various precision machining occasions.

Description

Technical Field

[0001] This utility model relates to the field of internal hole surface treatment, and specifically to a rolling strengthening device for internal hole surface treatment. Background Technology

[0002] Internal hole wall strengthening is an important process for improving the surface hardness, fatigue strength, and corrosion resistance of workpiece inner walls, and it is widely used in aerospace, automotive manufacturing, and machining. Currently, commonly used internal hole wall strengthening methods include rolling, shot peening, laser shock peening, ultrasonic shock peening, carburizing and nitriding, induction hardening, electroplating, and spraying. However, a common problem with these methods in practical applications is low processing efficiency. Especially when processing workpieces with complex shapes and long inner holes, existing strengthening methods often require a significant amount of time and manpower, making it difficult to meet the demands of modern manufacturing for efficient and automated production. Utility Model Content

[0003] The main purpose of this invention is to provide a rolling strengthening device for internal hole surface treatment, thereby solving the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: including a rolling device installed on the tailstock of the machine tool, the rolling device and the workpiece fixed on the machine tool chuck are arranged coaxially, and at least one sliding support seat is provided between the rolling device and the machine tool slide rail;

[0005] The rolling device includes a housing support assembly and an internal drive assembly. The internal drive assembly is located within the housing assembly and moves back and forth. The housing support assembly has a radially movable fixed seat at its end, and a rotating roller is installed inside the fixed seat. The roller abuts against the inner wall of the workpiece.

[0006] The internal drive assembly has a drive head fixed at one end. Multiple wedges are provided on the outer side of one end of the drive head. A guide groove is provided on one side of the wedge. An inclined groove is provided at the bottom of the fixed seat. The fixed seat slides against the inclined surface of the wedge through the inclined groove. A through hole is provided on one side of the inclined groove. A pin is fixed in the through hole and slides against the guide groove.

[0007] Preferably, the outer shell support assembly includes a cylinder, a connecting cylinder, an extension cylinder, and a fixing cylinder. A rolling cylinder is fixedly provided at the end of the fixing cylinder, and multiple slots are provided on the outer side of the rolling cylinder. The fixing seat moves within the slots.

[0008] A base is fixedly installed at the tail of the cylinder, and the end of the base is coaxially fixedly connected to the tailstock of the machine tool by a flange and bolts.

[0009] Preferably, the cylinder is connected to the base and the connecting cylinder at both ends by flanges and bolts, respectively;

[0010] The connecting cylinder and the extension cylinder are provided with multiple corresponding connecting holes on their circumferences;

[0011] The circumferences of the rolling cylinder and the fixed cylinder are provided with multiple corresponding connection holes;

[0012] A pin is fixed inside the connecting hole, and the pin is used to connect the two.

[0013] Preferably, the extended cylinder and the fixed cylinder are connected by a rectangular thread, and oil inlets are provided at both ends of the outer side of the cylinder.

[0014] Preferably, the internal drive assembly includes a spindle, one end of which is fixedly connected to the drive head, and the other end is provided with a piston body, which is fixed to the end of the spindle by a locking nut;

[0015] The piston body is sealed and slides within the cylinder of the housing support assembly, and a seal is provided between the connecting cylinder and the spindle in the housing support assembly.

[0016] Preferably, an end cap is fixed to the end of the rolling cylinder, and a groove is provided inside the end cap, with the end of the drive head located in the groove.

[0017] Preferably, a fixed plate is fixedly provided at the tail of the machine tool, a motor is fixedly provided on one side of the fixed plate, and a rotating lead screw is provided between the machine tool slide rails on both sides of the machine tool. One end of the lead screw is fixedly connected to the output shaft of the motor, and the other end is abutted against the machine tool through a bearing seat. The bottom of the machine tool tailstock is threadedly connected to the lead screw through a threaded sleeve.

[0018] Preferably, a hydraulic station is also provided, which is connected to the oil ports at both ends of the cylinder in the outer casing support assembly via control valves and oil pipes.

[0019] Preferably, the top of the fixing seat is provided with a groove, and pin holes are provided on both sides of the groove. The roller is located in the groove and passes through the pin shaft and abuts against the pin hole. A threaded hole is provided on one side of the pin hole, and a threaded connecting screw is provided in the threaded hole. The end of the screw abuts against the pin shaft.

[0020] This utility model provides a rolling strengthening device for internal hole surface treatment, with the following advantages:

[0021] 1. Continuous rolling pressing of the inner wall of a workpiece with rollers can significantly improve the surface roughness of the inner hole, making it smoother and flatter. The work hardening effect during the rolling process can increase surface hardness and enhance wear resistance.

[0022] 2. The plastic deformation generated during the rolling process creates residual compressive stress on the material surface, improving the fatigue strength and durability of the workpiece. Rolling strengthening can reduce or eliminate microcracks and other defects on the inner surface of the workpiece, thereby improving overall mechanical properties.

[0023] 3. The hydraulic drive system allows for precise adjustment of the piston's movement speed and force via control valves, ensuring the stability and consistency of the rolling process. The combined use of the lead screw and motor enables precise feeding of the machine tool tailstock, guaranteeing the relative positional accuracy between the rolling device and the workpiece.

[0024] 4. The entire device can be controlled by a CNC system, achieving automated operation, reducing manual intervention, and improving production efficiency. The integrated design of components such as the hydraulic station, motor, and control valves makes the operation of the entire system simpler and more reliable.

[0025] 4. By adjusting the rectangular threaded connection between the extension cylinder and the fixed cylinder, the length of the rolling device can be easily changed to accommodate workpieces of different sizes. By replacing different rollers, it can meet the surface treatment requirements of internal holes of different shapes and materials. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a front view of the overall structure of this utility model;

[0028] Figure 2 This is a front sectional view of the machine tool tailstock drive structure of this utility model;

[0029] Figure 3 This is a front sectional view of the rolling device of this utility model;

[0030] Figure 4 This is a utility model Figure 3 Sectional view of AA;

[0031] Figure 5 This is a side view of the fixed base of this utility model;

[0032] Figure 6 This is a utility model Figure 5 A front sectional view;

[0033] Figure 7 This is a side view of the drive head shaft of this utility model;

[0034] Figure 8 This is a utility model Figure 7 Side view;

[0035] In the diagram: 1. Machine tool; 2. Machine tool slide rail; 3. Machine tool tailstock; 4. Fixing plate; 5. Motor; 6. Sliding support seat; 7. Rolling device; 701. Base; 702. Cylinder; 703. Connecting cylinder; 704. Extended cylinder; 705. Fixing cylinder; 706. Rolling cylinder; 707. End cover; 708. Drive head; 7081. Wedge block; 7082. Guide groove; 7082. Fixing seat; 709. Inclined groove; 7091. Through hole; 7092. Groove; 7093. Pin hole; 7094. Piston body; 710. Locking nut; 711. Pin shaft; 712. Roller; 713. Mandrel; 714. Workpiece; 9. Machine tool chuck; 10. Lead screw; 11. Threaded sleeve. Detailed Implementation

[0036] Example 1

[0037] like Figures 1-8 As shown, the rolling strengthening device for internal hole surface treatment includes a rolling device 7 installed on the tailstock 3 of the machine tool. The rolling device 7 is coaxially arranged with the workpiece 8 fixed on the machine tool chuck 9. At least one sliding support seat 6 is provided between the rolling device 7 and the machine tool slide rail 2.

[0038] The rolling device 7 includes a housing support assembly and an internal drive assembly. The internal drive assembly is located within the housing assembly and moves back and forth. The housing support assembly has a radially movable fixed seat 709 at its end. The fixed seat 709 has a rotating roller 713 inside it, and the roller 713 abuts against the inner wall of the workpiece 8.

[0039] An internal drive assembly has a drive head 708 fixed at its end. Multiple wedges 7081 are provided on the outer side of one end of the drive head 708. A guide groove 7082 is provided on one side of the wedge 7081. A groove 7091 is provided at the bottom of the fixed seat 709. The fixed seat 709 slides against the inclined surface of the wedge 7081 through the groove 7091. A through hole 7092 is provided on one side of the groove 7091. A pin is fixed in the through hole 7092. The pin slides against the guide groove 7082.

[0040] The workpiece 8 is mounted on the machine tool chuck 9, and the rolling device 7 is mounted on the machine tool tailstock 3. The rolling device 7 is also connected to the machine tool slide rail 2 through multiple sliding support seats 6 so that the rolling device 7 and the workpiece 8 are arranged coaxially. The internal drive assembly drives the drive head 708 to move, and then the inclined surface of the wedge block 7081 cooperates with the inclined groove 7091 at the bottom of the fixed seat 709, and the outer groove of the rolling cylinder 706 restricts the fixed seat 709 to move radially, driving the roller 713 to abut against the inner wall of the workpiece 8. The inner wall of the workpiece 8 can be rolled and strengthened by the machine tool 1 driving the workpiece 8 to rotate and the rolling device 7 to feed.

[0041] The rolling device comprises a housing support assembly and an internal drive assembly. The internal drive assembly is movable within the outer housing. One end of the housing support assembly has a radially movable fixed seat containing rotating rollers that directly contact and act on the inner wall of the workpiece. The drive assembly has a drive head at its end, equipped with multiple sets of wedges, each with a guide groove. A corresponding inclined groove is provided at the bottom of the fixed seat, which, in conjunction with the wedges on the drive head, achieves radial movement. A through hole is also provided on one side of the inclined groove, through which a pin is installed. This pin slides within the guide groove, further ensuring the accuracy of the operation.

[0042] When processing the inner wall of a workpiece, first mount the workpiece onto the machine tool chuck, ensuring the rolling device is correctly mounted on the machine tool tailstock and that both are coaxial. Next, activate the internal drive assembly to advance the drive head forward. Due to the inclined surface engagement between the wedge and the fixed seat, coupled with the constraint from the outside of the rolling cylinder, the fixed seat expands radially outward. During this expansion, the rollers within the fixed seat press tightly against the inner wall of the workpiece. Simultaneously, as the machine tool rotates the workpiece and the rolling device itself feeds, the rollers begin to continuously roll and press against the inner wall of the workpiece. This not only improves the surface quality of the workpiece's inner wall but also enhances its hardness, wear resistance, and fatigue resistance.

[0043] Preferably, the outer shell support assembly includes a cylinder 702, a connecting cylinder 703, an extension cylinder 704, and a fixing cylinder 705. A rolling cylinder 706 is fixedly provided at the end of the fixing cylinder 705. A plurality of slots are provided on the outer side of the rolling cylinder 706, and the fixing seat 709 moves within the slots.

[0044] A base 701 is fixedly mounted at the tail of the cylinder 702. The end of the base 701 is coaxially fixedly connected to the tailstock 3 of the machine tool via a flange and bolts.

[0045] These components together form a path extending from the machine tool tailstock into the workpiece. A rolling mill 706 is mounted at one end of the fixed cylinder 705, the latter having multiple slots on its outer side. These slots are designed to cooperate with the drive head 708 and the fixed seat 709, allowing the fixed seat 709 to move radially within the slots and thus abut against the inner wall of the workpiece 8.

[0046] The tail of the cylinder 702 is connected to the machine tool tailstock 3 via a base 701, which ensures that the entire device can be stably installed on the machine tool and guarantees coaxiality.

[0047] Preferably, the cylinder 702 is connected to the base 701 and the connecting cylinder 703 at both ends by flanges and bolts, respectively;

[0048] The connecting cylinder 703 and the extended cylinder 704 are provided with a plurality of corresponding connecting holes on their periphery;

[0049] The circumference of the rolling cylinder 706 and the fixed cylinder 705 is provided with a plurality of corresponding connecting holes;

[0050] A pin 712 is fixed inside the connecting hole, and the pin 712 is used to connect the two.

[0051] The cylinder 702 is one of the core components of the housing support assembly. It is connected to one end of the base 701 and the other end of the connecting cylinder 703 via flanges and bolts. This connection method ensures the stability and precision between the components.

[0052] The connecting cylinder 703 and the extended cylinder 704 are connected by multiple connecting holes on their circumference. Pins 712 are fixed inside these connecting holes to ensure a stable connection. The pins 712 provide additional support and prevent loosening due to vibration or pressure during operation.

[0053] The extension cylinder 704 is used to extend the working length of the entire rolling device, making it suitable for workpieces of different sizes. Its connection to the connecting cylinder 703 is also achieved through the circumferential connecting holes and the pin 712.

[0054] The fixed cylinder 705 is located at the front end of the entire device, and a rolling cylinder 706 is installed at one end of it. Similarly, the fixed cylinder and the rolling cylinder are reliably connected by connecting holes and pins 712 provided on the periphery.

[0055] The outer side of the rolling cylinder 706 is provided with multiple slots, which are used to limit the radial movement range of the fixed base 709 and support the fixed base to move along a specific path. The rolling cylinder and the fixed cylinder are connected by peripheral connecting holes and pins 712, which ensures the accuracy of the rolling cylinder's position and its stability during operation.

[0056] Preferably, the extended cylinder 704 and the fixed cylinder 705 are connected by a rectangular thread, and oil inlets are provided at both ends of the outer side of the cylinder 702.

[0057] The extended cylinder 704 and the fixed cylinder 705 are connected by a rectangular thread. This connection method provides high load-bearing capacity and good self-locking performance, making it suitable for withstanding large axial forces and torques, and allowing for easy length adjustment to meet the needs of workpieces of different sizes. The rectangular thread has a large contact area, providing better rigidity and stability, while also facilitating quick disassembly and maintenance.

[0058] Cylinder 702 is not only part of the outer casing support assembly, but also serves to provide power to the internal drive assembly. It has oil inlets at both ends on its outer side, which introduce high-pressure hydraulic fluid into the cylinder to drive the internal drive assembly. After completing its work, the hydraulic fluid flows out and returns to the oil tank or other storage device, thus achieving recycling. The application of the hydraulic system enables the rolling device to generate sufficient force to effectively roll the workpiece, while also ensuring smooth and controllable operation.

[0059] Preferably, the internal drive assembly includes a spindle 714, one end of which is fixedly connected to the drive head 708, and the other end is provided with a piston body 710, which is fixed to the end of the spindle 714 by a locking nut 711.

[0060] The piston body 710 is sealed and slides within the cylinder 702 in the housing support assembly, and a seal is provided between the connecting cylinder 703 and the spindle 714 in the housing support assembly.

[0061] The internal drive assembly includes a spindle 714, one end of which is fixedly connected to a drive head 708. The drive head 708 moves radially by engaging with a wedge 7081 on its surface with a groove 7091 at the bottom of a fixed seat 709. The other end of the spindle 714 has a piston body 710, which is fixed to the spindle by a locking nut 711. This design ensures a secure connection between the piston body and the spindle.

[0062] The piston body 710 is located within the cylinder 702 in the housing support assembly and is capable of sealed sliding. This means that the piston body can move axially inside the cylinder while maintaining good sealing performance to prevent oil leakage. To ensure the sealing between the piston body and the cylinder, sealing rings or other forms of seals are typically installed on the outside of the piston body.

[0063] A seal is also provided between the connecting cylinder 703 and the spindle 714. The function of these seals is to prevent hydraulic oil from leaking from the connection, ensuring the sealing and reliability of the entire system.

[0064] When a rolling operation is required, high-pressure oil enters the cylinder 702 through the inlet, pushing the piston 710 forward axially. As the piston moves, it drives the spindle 714 and the drive head 708 fixed to it forward. The wedge 7081 on the drive head 708 interacts with the inclined groove 7091 at the bottom of the fixed seat 709, causing the fixed seat to move radially outward, allowing the roller 713 inside the fixed seat to contact and press against the inner wall of the workpiece 8. While the machine tool rotates the workpiece, the rolling device feeds axially, completing the rolling strengthening treatment of the workpiece's inner hole surface. After processing, by reversing the flow of oil, the piston 710 resets, ready for the next operation.

[0065] Preferably, an end cap 707 is fixedly provided at the end of the rolling cylinder 706, and a groove is provided inside the end cap 707, with the end of the drive head 708 located in the groove. The drive head 708 moves to the end and enters the groove, thereby achieving a seal and preventing foreign objects from entering the rolling cylinder 706.

[0066] Preferably, a fixing plate 4 is fixedly provided at the tail of the machine tool 1, a motor 5 is fixedly provided on one side of the fixing plate 4, and a rotating lead screw 10 is provided between the machine tool slide rails 2 on both sides of the machine tool 1. One end of the lead screw 10 is fixedly connected to the output shaft of the motor 5, and the other end is abutted against the machine tool 1 through a bearing seat. The bottom of the machine tool tailstock 3 is threadedly connected to the lead screw 10 through a threaded sleeve 11.

[0067] The motor 5 drives the lead screw 10 to rotate, which in turn drives the machine tool tailstock 3 to move, thereby realizing the feeding of the rolling device 7. At the same time, the machine tool chuck 9 drives the workpiece 8 to rotate, so that the roller 713 moves and rolls within the workpiece 8.

[0068] Preferably, a hydraulic station is also provided, which is connected to the oil ports at both ends of the cylinder 702 in the outer casing support assembly via control valves and oil pipes.

[0069] The hydraulic power unit is the power source of the entire system. It is responsible for providing high-pressure hydraulic fluid to drive the piston 710 to move within the cylinder 702. A hydraulic power unit typically includes components such as an oil pump, oil tank, filter, and cooler to ensure stable oil quality and pressure.

[0070] A control valve is installed on the oil pipe between the hydraulic station and the cylinder to control the direction, flow rate, and pressure of the hydraulic fluid. By adjusting the state of the control valve, the movement speed and force of the piston 710 can be precisely controlled. The control valve can be manually operated, or electrically or pneumatically controlled, depending on the required level of automation.

[0071] The oil pipes connect the hydraulic station to the oil inlets at both ends of the cylinder 702, forming a closed hydraulic circuit. The first oil inlet introduces high-pressure oil into the rear end of the cylinder, pushing the piston forward; the second oil inlet introduces high-pressure oil into the front end of the cylinder, pushing the piston backward to reset.

[0072] Preferably, the top of the fixed base 709 is provided with a groove 7093, and pin holes 7094 are provided on both sides of the groove 7092. The roller 713 is provided in the groove 7092 and passes through the pin shaft and abuts against the pin hole 7094. A threaded hole is provided on one side of the pin hole 7094, and a threaded connecting set screw is provided in the threaded hole. The end of the set screw abuts against the pin shaft.

[0073] The roller 713 rotates against the groove via a pin, and the pin is fixed by a set screw to prevent it from falling off.

[0074] Example 2

[0075] like Figures 1-3 As shown in Example 1, the steps for using the rolling strengthening device for internal hole surface treatment are as follows:

[0076] S1. Installation Preparation

[0077] Fixing the workpiece: Mount and fix the workpiece 8 to be processed on the machine tool chuck 9. Ensure that the workpiece is firmly clamped in the chuck to prevent displacement during processing.

[0078] Install the rolling device: Secure the rolling device 7 to the machine tool tailstock 3 with bolts. Ensure that the connection between the rolling device and the machine tool tailstock is secure and reliable.

[0079] Sliding support seats are installed: Multiple sliding support seats 6 are installed in the middle of the rolling device 7. These support seats are used to ensure the stability of the rolling device 7 during the feeding process and to ensure that the entire system, including the workpiece, the rolling device and the sliding support seats, is arranged coaxially.

[0080] S2, Hydraulic drive preparation

[0081] Start the hydraulic station: Turn on the hydraulic station and prepare the high-pressure oil.

[0082] Drive piston body: The oil flow direction is adjusted by the control valve, so that the high pressure oil enters the oil inlet of the cylinder 702 and pushes the piston body 710 forward along the axis.

[0083] Propulsion spindle: As the piston body 710 moves, the spindle 714 and the drive head 708 fixed thereto also move forward.

[0084] Radial expansion: The wedge 7081 on the drive head 708 interacts with the inclined groove 7091 at the bottom of the fixed seat 709, causing the fixed seat to move radially, thereby driving the roller 713 to abut against the inner wall of the workpiece 8.

[0085] S3, Processing procedure

[0086] Rotating the workpiece: Start the machine tool and drive the machine tool chuck 9 to rotate, thereby causing the workpiece 8 to start rotating.

[0087] Synchronous feed: At the same time, the lead screw 10 is driven to rotate by the motor 5, which drives the tailstock 3 to move along the machine tool slide rail 2, thereby realizing the feed motion of the rolling device 7.

[0088] Roller burnishing: As the roller burnishing device 7 feeds, the roller 713 continuously rolls and presses on the inner wall of the workpiece 8 to complete the roller burnishing strengthening treatment of the inner hole surface of the workpiece.

[0089] S4, End Operation

[0090] Reset: After processing is completed, the state is changed by controlling the valve so that the oil returns to the hydraulic station through the oil port, and the piston body 710 is reset.

[0091] Unloading the workpiece: Stop the rotation of the machine tool chuck 9, release the workpiece clamp, and remove the machined workpiece from the chuck.

[0092] Clean the equipment: Inspect and clean the rolling device 7 and all parts of the machine tool to prepare for the next processing.

[0093] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A rolling strengthening device for internal hole surface treatment, characterized in that: It includes a rolling device (7) installed on the tailstock (3) of the machine tool, the rolling device (7) and the workpiece (8) fixed on the machine tool chuck (9) are arranged coaxially, and at least one sliding support seat (6) is provided between the rolling device (7) and the machine tool slide rail (2). The rolling device (7) includes an outer shell support assembly and an internal drive assembly. The internal drive assembly is located within the outer shell assembly and moves back and forth. The outer shell support assembly has a radially movable fixed seat (709) at its end. The fixed seat (709) has a rotating roller (713) inside it. The roller (713) abuts against the inner wall of the workpiece (8). An internal drive assembly is fixedly provided with a drive head (708) at one end. Multiple wedges (7081) are provided on the outer side of one end of the drive head (708). A guide groove (7082) is provided on one side of the wedge (7081). A sloping groove (7091) is provided at the bottom of the fixed seat (709). The fixed seat (709) slides against the inclined surface of the wedge (7081) through the sloping groove (7091). A through hole (7092) is provided on one side of the sloping groove (7091). A pin is fixedly provided in the through hole (7092). The pin slides against the guide groove (7082).

2. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: The outer shell support assembly includes a cylinder (702), a connecting cylinder (703), an extension cylinder (704), and a fixed cylinder (705). A rolling cylinder (706) is fixed at the end of the fixed cylinder (705). Multiple slots are provided on the outside of the rolling cylinder (706), and the fixed seat (709) moves within the slots. The cylinder (702) is fixedly provided with a base (701) at the tail end, and the end of the base (701) is coaxially fixedly connected to the machine tool tailstock (3) by a flange and bolts.

3. The rolling strengthening device for internal hole surface treatment according to claim 2, characterized in that: The cylinder (702) is connected to the base (701) and the connecting cylinder (703) at both ends by flanges and bolts, respectively; The connecting cylinder (703) and the extended cylinder (704) are provided with a number of corresponding connecting holes on their periphery; The circumference of the rolling cylinder (706) and the fixed cylinder (705) is provided with a number of corresponding connecting holes; A pin (712) is fixed inside the connecting hole, and the pin (712) is used to connect the two.

4. The rolling strengthening device for internal hole surface treatment according to claim 2, characterized in that: The extended cylinder (704) and the fixed cylinder (705) are connected by a rectangular thread, and oil inlets are provided at both ends of the outer side of the cylinder (702).

5. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: The internal drive assembly includes a spindle (714), one end of which is fixedly connected to the drive head (708), and the other end is provided with a piston body (710), which is fixed to the end of the spindle (714) by a locking nut (711); The piston body (710) is sealed and slides within the cylinder (702) in the housing support assembly, and a seal is provided between the connecting cylinder (703) and the spindle (714) in the housing support assembly.

6. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: An end cap (707) is fixed to the end of the rolling cylinder (706), and a groove is provided inside the end cap (707), with the end of the drive head (708) located in the groove.

7. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: A fixed plate (4) is fixedly installed at the tail of the machine tool (1). A motor (5) is fixedly installed on one side of the fixed plate (4). A rotating lead screw (10) is provided between the machine tool slide rails (2) on both sides of the machine tool (1). One end of the lead screw (10) is fixedly connected to the output shaft of the motor (5), and the other end is abutted against the machine tool (1) through a bearing seat. The bottom of the machine tool tailstock (3) is threadedly connected to the lead screw (10) through a threaded sleeve (11).

8. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: It is also equipped with a hydraulic station, which is connected to the oil ports at both ends of the cylinder (702) in the outer casing support assembly through control valves and oil pipes.

9. The rolling strengthening device for internal hole surface treatment according to claim 1, characterized in that: The top of the fixed base (709) is provided with a groove (7093), and pin holes (7094) are provided on both sides of the groove (7093). The roller (713) is located in the groove (7093) and passes through the roller (713) through the pin shaft and abuts against the pin hole (7094). A threaded hole is provided on one side of the pin hole (7094), and a threaded connecting set screw is provided in the threaded hole. The end of the set screw abuts against the pin shaft.

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