Inner hole automatic hammering strengthening device

Abstract

The utility model provides an automatic hammering and strengthening device for an inner hole, which comprises a hammering device arranged on a tailstock of a machine tool, a plurality of hammering heads capable of reciprocating in the radial direction are arranged on the peripheral side of the end part of the hammering device, the hammering heads are arranged in a workpiece arranged on a chuck of the machine tool and used for hammering and strengthening the inner wall of the workpiece, and a sliding support seat is arranged on a sliding rail of the machine tool. The sliding supporting seat is used for supporting the hammering device; a sliding hammer core shaft is arranged in the hammering sleeve, the bottom of the hammering head is clamped on the hammer core shaft to slide, a pneumatic linear vibrator is arranged at one end of the transmission rod assembly, and the other end of the transmission rod assembly is connected with the hammer core shaft. According to the utility model, the machining efficiency and precision of inner wall strengthening of the inner hole are obviously improved, the performance of a workpiece is enhanced, and the labor intensity and the production cost are reduced. The method is suitable for workpieces with various complex shapes and long inner holes, and the requirements of the modern manufacturing industry for efficient and high-quality production are met.

Description

Technical Field

[0001] This utility model relates to the field of internal wall strengthening, specifically to an automatic hammering strengthening device for internal holes. 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 objective of this invention is to provide an automatic hammering strengthening device for internal holes, 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 as follows: a hammering device is installed on the tailstock of a machine tool, and a plurality of radially reciprocating hammering heads are provided on the periphery of the end of the hammering device. The hammering heads are placed inside the workpiece mounted on the machine tool chuck to hammer and strengthen its inner wall. A sliding support seat is provided on the machine tool slide rail to support the hammering device.

[0005] The hammering device includes a sliding transmission rod assembly inside the housing assembly. The housing assembly includes an outer tube and a transition tube. A hammering sleeve is fixed at the end of the transition tube. An end cap is fixed at the end of the hammering sleeve. A sliding hammer core shaft is provided inside the hammering sleeve. The bottom of the hammer head is locked on the hammer core shaft and slides. A pneumatic linear vibrator is provided at one end of the transmission rod assembly, and the other end is connected to the hammer core shaft.

[0006] Preferably, a bottom tube is fixed to the end of the outer tube, and the end of the bottom tube is fixed to the tailstock of the machine tool, with the linear vibrator installed inside the bottom tube.

[0007] Preferably, the transmission rod assembly includes a transmission rod, an extension rod, and a connecting rod connected in sequence. The end of the transmission rod is fixedly connected to the hammer core shaft. A ball bearing sleeve is provided between the hammer core shaft and the hammer sleeve. The hammer core shaft slides against the hammer sleeve through the ball bearing sleeve.

[0008] Preferably, the outer tube is provided with multiple linear bearing supports, and the extension rod in the transmission rod assembly slides against the linear bearing supports.

[0009] Preferably, a boss is fixedly provided on the outer side of the end of the connecting rod, a fixing ring is fixedly provided inside the outer tube, and a spring is provided between the fixing ring and the boss. The spring is sleeved on the connecting rod, with one end abutting against the boss and the other end abutting against the fixing ring.

[0010] A first pressure block is fixed at the tail of the connecting rod, and a second pressure block is fixed at the end of the linear vibrator. The second pressure block is arranged coaxially with the first pressure block and abuts against the first pressure block.

[0011] Preferably, the outer side of the hammer shaft end is provided with multiple inclined surfaces, and dovetail grooves are provided on the inclined surfaces. A dovetail block is provided at the bottom of the hammer head, and the dovetail block slides against the dovetail groove.

[0012] Preferably, the hammer sleeve and the end cap are provided with multiple corresponding grooves, which are spliced ​​together to form a slot, and the hammer head slides in the slot.

[0013] Preferably, the top of the sliding seat in the hammer head is provided with multiple mounting holes, and an alloy impact head is provided in the mounting holes. The bottom of the alloy impact head is fixed in the mounting holes by a support cylinder. The end face of the sliding seat is provided with a pressure cap, and the two ends of the pressure cap are fixedly connected to the sliding seat by bolts, thereby pressing and fixing the alloy impact head.

[0014] Preferably, a fixed seat is fixedly provided at the tail of the machine tool, a motor is fixedly provided on the fixed seat, a rotating lead screw is provided between the slide rails of the machine tool, one end of the lead screw is connected to the output shaft of the motor, and the other end is abutted against the machine tool and rotates through a bearing seat, and the bottom of the tailstock is threadedly connected to the lead screw through a threaded sleeve.

[0015] This utility model provides an automatic hammering strengthening device for internal holes, with the following advantages:

[0016] 1. By driving the movement of the lead screw and tailstock via a motor, the hammering device achieves precise feeding. Combined with the workpiece rotation, this ensures the hammer head evenly covers the entire inner wall of the workpiece, significantly improving processing efficiency. The pneumatic linear vibrator and spring work together to achieve rapid reciprocating motion of the hammer head, significantly shortening the time for a single hammer strike and increasing overall processing speed.

[0017] 2. The motor-driven lead screw system ensures precise movement of the tailstock, enabling the hammering device to accurately enter the workpiece's inner hole, thus improving machining accuracy. The sliding support and slot design ensures accurate radial movement of the hammer head, enhancing the uniformity and stability of the strengthening effect.

[0018] 3. The alloy impact heads in the hammer head are arranged in multiple rows with arcs between them, which can better match the shape of the workpiece's inner wall, ensuring the uniformity and effectiveness of the hammering. It is suitable for workpieces of various shapes and sizes, especially those with complex shapes and long inner holes, enabling efficient and uniform inner wall strengthening.

[0019] 4. The radial movement of the hammer head induces plastic deformation in the inner wall of the workpiece, creating compressive residual stress, which significantly improves the surface hardness and fatigue strength of the workpiece's inner wall. The formation of compressive residual stress also helps improve the corrosion resistance of the workpiece's inner wall, extending its service life.

[0020] 5. The entire hammering strengthening process is automated, reducing manual intervention, lowering labor intensity, and improving production safety and reliability. Highly efficient internal hole hammering strengthening can be achieved through simple settings and startup; operation is simple and easy to master. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a front view of the overall structure of this utility model;

[0023] Figure 2 This is a utility model Figure 1 A partial frontal sectional view;

[0024] Figure 3 This is a front sectional view of the hammering device of this utility model;

[0025] Figure 4 This is a side view of the hammer core shaft of this utility model;

[0026] Figure 5 This is a front sectional view of the connection between the hammer-driven sleeve and the end cap of this utility model;

[0027] Figure 6 This is a top view of the hammer head of this utility model;

[0028] Figure 7 This is a utility model Figure 6 AA section view in the middle;

[0029] Figure 8 This is a utility model Figure 6 BB section view in the middle;

[0030] In the diagram: 1. Bottom tube; 2. Outer tube; 3. Transition tube; 4. Hammering sleeve; 5. Hammer shaft; 501. Inclined surface; 502. Dovetail groove; 6. Hammering head; 601. Pressure cap; 602. Alloy impact head; 603. Locking bolt; 604. Sliding seat; 605. Dovetail block; 606. Support cylinder; 7. End cap; 8. Ball bearing sleeve; 9. Transmission rod; 10. Extension rod; 11. Linear bearing support; 12. Fixing ring; 13. Connecting rod; 14. Spring; 15. First pressure block; 16. Second pressure block; 17. Pneumatic linear vibrator; 18. Slide rail; 19. Chuck; 20. Tailstock; 21. Motor; 22. Workpiece; 23. Lead screw; 24. Lead sleeve; 25. Fixed seat; 26. Sliding support seat; 27. Slot. Detailed Implementation

[0031] Example 1

[0032] like Figures 1-8 As shown, an automatic internal hole hammering strengthening device includes a hammering device installed on the tailstock 20 of a machine tool. The end periphery of the hammering device is provided with a plurality of radially reciprocating hammering heads 6. The hammering heads 6 are placed in the workpiece 22 installed on the machine tool chuck 19 to hammer and strengthen its inner wall. A sliding support seat 26 is provided on the machine tool slide rail 18 to support the hammering device.

[0033] The hammering device includes a transmission rod assembly that slides inside the housing assembly. The housing assembly includes an outer tube 2 and a transition tube 3. A hammering sleeve 4 is fixed at the end of the transition tube 3. An end cap 7 is fixed at the end of the hammering sleeve 4. A sliding hammer core shaft 5 is provided inside the hammering sleeve 4. The bottom of the hammering head 6 is locked on the hammer core shaft 5 and slides. A pneumatic linear vibrator 17 is provided at one end of the transmission rod assembly, and the other end is connected to the hammer core shaft 5.

[0034] The workpiece 22 is mounted on the machine tool chuck 19 and rotates. The hammering device is mounted on the machine tool tailstock 20. The movement of the tailstock 20 drives the hammering device to feed. Multiple radially reciprocating hammer heads 6 at the end of the hammering device act on the inner wall of the workpiece 22, thereby strengthening it through hammering. Through the rotation of the workpiece 22 and the feed of the hammering device, the hammer heads 6 can cover the entire inner wall of the workpiece 22, making automated control processing more efficient. The pneumatic linear vibrator 17 in the hammering device can drive the hammer core shaft 5 through the transmission rod assembly, thereby driving the hammer heads 6 to move radially and act on the inner wall of the workpiece 22. The outer shell assembly and the transmission rod assembly are used for extension, customized according to the length of the workpiece 22, so that the hammer heads 6 at the end can enter the interior of the workpiece 22.

[0035] The hammering device is mounted on the tailstock of the machine tool, and its end is surrounded by multiple hammer heads that can move radially back and forth. These hammer heads can enter the inner hole of the workpiece to hammer and strengthen the inner wall of the workpiece.

[0036] The machine tool slide rail is equipped with a sliding support seat to support the hammering device and allow it to move along the slide rail to accommodate workpieces of different lengths. The transmission rod assembly includes one or more parts that can slide within the housing assembly, which is composed of an outer tube, a transition tube, etc. A hammering sleeve is fixed to one end of the transition tube, and an end cap is fixed to one end of the hammering sleeve. Inside the hammering sleeve is a slidable hammer core shaft, and the bottom of the hammer head is designed to slide along the hammer core shaft.

[0037] The pneumatic linear vibrator is located at one end of the transmission rod assembly and is used to provide power. The power is transmitted to the hammer core shaft through the transmission rod assembly, which in turn drives the hammer head to move radially, thereby achieving hammering strengthening of the inner wall of the workpiece.

[0038] The workpiece is mounted on the machine tool chuck and can rotate, while the hammering device is mounted on the machine tool tailstock. By adjusting the position of the tailstock, the hammering device is driven forward or backward, coordinating with the rotation of the workpiece to ensure that the hammer head can evenly cover every part of the inner wall of the workpiece.

[0039] Preferably, a bottom tube 1 is fixed to the end of the outer tube 2, and the end of the bottom tube 1 is fixed to the tailstock 20 of the machine tool. The linear vibrator 17 is installed inside the bottom tube 1. The end of the bottom tube 1 is fixedly connected to the tailstock 20 by a flange and bolts. The linear vibrator 17 is installed inside the bottom tube 1 and arranged coaxially with the transmission rod assembly.

[0040] The base tube 1 serves as the foundation structure of the entire hammering device. One end is fixed to the end of the outer tube 2, while the other end is fixed to the tailstock 20 of the machine tool via a flange and bolts. This design not only provides stable support but also facilitates the installation and disassembly of the device.

[0041] The linear vibrator 17 is installed inside the base tube 1 and is arranged coaxially with the drive rod assembly. This means that the vibration generated by the linear vibrator can be directly and effectively transmitted to the drive rod assembly, thereby driving the hammer head 6 on the hammer shaft 5 to move radially. This layout optimizes the power transmission path, reduces energy loss, and improves hammering efficiency.

[0042] Preferably, the transmission rod assembly includes a transmission rod 9, an extension rod 10 and a connecting rod 13 connected in sequence. The end of the transmission rod 9 is fixedly connected to the hammer core shaft 5. A ball bearing sleeve 8 is provided between the hammer core shaft 5 and the hammer sleeve 4. The hammer core shaft 5 slides against the hammer sleeve 4 through the ball bearing sleeve 8.

[0043] The extension rod 10 and the outer tube 2 are matched and customized according to the length of the workpiece 22, so that the hammer head 6 can enter the interior of the workpiece 22. The transmission rod 9 reciprocates and drives the hammer core shaft 5 to move. The ball bearing sleeve 8 can ensure that the movement of the hammer core shaft 5 is smoother and more reliable.

[0044] Preferably, the outer tube 2 is provided with multiple linear bearing supports 11, and the extension rod 10 in the transmission rod assembly slides against the linear bearing supports 11.

[0045] The extension rod 10 is slidably supported inside the outer tube 2 by multiple linear bearings 11, ensuring its smooth and reliable movement.

[0046] Preferably, a boss is fixedly provided on the outer side of the end of the connecting rod 13, a fixing ring 12 is fixedly provided inside the outer tube 2, and a spring 14 is provided between the fixing ring 12 and the boss. The spring 14 is sleeved on the connecting rod 13, with one end abutting against the boss and the other end abutting against the fixing ring 12.

[0047] A first pressure block 15 is fixed at the tail of the connecting rod 13, and a second pressure block 16 is fixed at the end of the linear vibrator 17. The second pressure block 16 is arranged coaxially with the first pressure block 15 and abuts against the first pressure block 15.

[0048] The linear vibrator 17 pushes the first pressure block 15 through the second pressure block 16, thereby driving the connecting rod 13 to move. The rebound force of the spring 14 causes the connecting rod 13 to return to its original position, thereby enabling the hammer core shaft 5 to move back and forth, and thus causing the hammer sleeve 4 to reciprocate and hammer the inner wall of the workpiece 22.

[0049] The linear vibrator 17 generates high-frequency vibration, which pushes the first pressure block 15 through the second pressure block 16. The first pressure block 15 transmits the vibration to the connecting rod 13, causing the connecting rod 13 to move forward. The movement of the connecting rod 13 is transmitted to the hammer core shaft 5 through the transmission rod 9 and the extension rod 10, causing the hammer core shaft 5 to slide within the hammering sleeve 4.

[0050] When the linear vibrator 17 stops vibrating, the rebound force of the spring 14 resets the connecting rod 13. The reset of the connecting rod 13 is transmitted to the hammer shaft 5 through the transmission rod 9 and the extension rod 10, causing the hammer shaft 5 to return to its initial position.

[0051] The reciprocating movement of the hammer shaft 5 drives the hammer head 6 to move radially, hammering and strengthening the inner wall of the workpiece 22. The workpiece 22 is mounted on the machine tool chuck 19 and rotates, while the hammering device is mounted on the machine tool tailstock 20. Through the movement of the tailstock 20, the hammering device feeds along the inner wall of the workpiece 22, and the hammer head 6 hammers and strengthens the inner wall of the workpiece 22. The combination of the rotation of the workpiece 22 and the feed of the hammering device ensures that the hammer head 6 can evenly cover the entire inner wall of the workpiece 22.

[0052] Preferably, the outer side of the end of the hammer shaft 5 is provided with multiple inclined surfaces 501, and the inclined surfaces 501 are provided with dovetail grooves 502. The bottom of the hammer head 6 is provided with a dovetail block 605, and the dovetail block 605 slides against the dovetail groove 502.

[0053] The axial reciprocating movement of the hammer shaft 5 is converted into the radial movement of the hammer head 6 through the dovetail fit on the inclined surface 501.

[0054] When the hammer shaft 5 reciprocates axially, the inclined surface 501 at its end pushes the dovetail block 605 at the bottom of the hammer head 6. Due to the cooperation between the dovetail block 605 and the dovetail groove 502, the hammer head 6 moves radially under the guidance of the inclined surface 501. The angle of the inclined surface 501 determines the amplitude of the radial movement of the hammer head 6, thus achieving an efficient conversion from axial movement to radial movement.

[0055] Preferably, the hammer sleeve 4 and the end cap 7 are provided with multiple corresponding grooves, which are spliced ​​together to form a retaining groove 27, within which the hammer head 6 slides. The radial movement of the hammer head 6 is ensured by the constraint of the retaining groove 27.

[0056] The hammer sleeve 4 and end cap 7 are provided with multiple grooves, which are joined together to form a retaining groove 27. The retaining groove 27 is designed to restrict and guide the radial movement of the hammer head 6, ensuring that it slides within a predetermined trajectory. The hammer head 6 is located within the retaining groove 27, and the restriction of the retaining groove 27 ensures the accuracy and stability of its radial movement. The bottom of the hammer head 6 is provided with a dovetail block 605, which cooperates with the dovetail groove 502 on the hammer core shaft 5 to realize the conversion from axial movement to radial movement.

[0057] Preferably, the top of the sliding seat 604 in the hammer head 6 is provided with multiple mounting holes, and the alloy impact head 602 is provided in the mounting holes. The bottom of the alloy impact head 602 is fixed in the mounting holes by the support cylinder 606. The end face of the sliding seat 604 is provided with a pressure cap 601. The two ends of the pressure cap 601 are fixedly connected to the sliding seat 604 by bolts, thereby pressing and fixing the alloy impact head 602.

[0058] The support cylinder 606 can adjust the protrusion height of the alloy impact head 602, and the connection between the pressure cap 601 and the sliding seat 604 is used to press and fix the alloy impact head 602. More preferably, the alloy impact heads 602 are arranged in multiple rows, and there is an arc between the multiple rows of alloy impact heads 602 to match the arc of the inner wall of the workpiece 22.

[0059] Preferably, a fixed seat 25 is fixedly provided at the tail of the machine tool, a motor 21 is fixedly provided on the fixed seat 25, and a rotating lead screw 23 is provided between the slide rails 18 of the machine tool. One end of the lead screw 23 is connected to the output shaft of the motor 21, and the other end is rotated against the machine tool through a bearing seat. The bottom of the tailstock 20 is threadedly connected to the lead screw 23 through a threaded sleeve 24.

[0060] The motor 21 can drive the lead screw 23 to rotate, thereby driving the tailstock 20 and the hammering device to feed. In conjunction with the rotation of the machine tool chuck 19, it can realize automated control and automatically hammer the inner wall of the workpiece 22.

[0061] Example 2

[0062] like Figures 1-3 As shown in Example 1, the method of using an automatic internal hole hammering strengthening device is further explained below:

[0063] Step S1: Installation of workpiece and device:

[0064] Workpiece fixing: Fix workpiece 22 on the machine tool chuck 19 to ensure that workpiece 22 is secure and centered;

[0065] Hammering device installation: Fix the hammering device on the tailstock 20 of the machine tool, ensuring that the hammering device is coaxial with the workpiece 22;

[0066] Sliding support seat installation: Multiple sliding support seats 26 are installed in the middle of the hammering device to ensure that the workpiece 22, the hammering device and the sliding support seats 26 are arranged coaxially to reduce vibration and improve stability.

[0067] Step S2: Feeding of the hammering device:

[0068] Start motor 21, and the output shaft of motor 21 drives lead screw 23 to rotate;

[0069] The rotation of the lead screw 23 is converted into the linear movement of the tailstock 20 through the lead sleeve 24, so that the tailstock 20 drives the hammering device to move into the workpiece 22.

[0070] Step S3: Activation of the hammer head:

[0071] When the pneumatic linear vibrator 17 is started, the vibration generated by the vibrator pushes the first pressure block 15 through the second pressure block 16, thereby driving the connecting rod 13 to move.

[0072] The movement of the connecting rod 13 is transmitted to the hammer core shaft 5 through the transmission rod 9 and the extension rod 10, so that the hammer core shaft 5 slides inside the hammer sleeve 4;

[0073] The axial reciprocating movement of the hammer shaft 5 is converted into the radial movement of the hammer head 6 through the cooperation of the inclined surface 501 and the dovetail groove 502.

[0074] The alloy impact head 602 hammers and strengthens the inner wall of the workpiece 22 under the radial movement of the hammer head 6;

[0075] Under the action of spring 14, connecting rod 13 is reset, thereby restoring hammer core shaft 5 and hammer head 6 to their initial positions, realizing rapid reciprocating hammering action.

[0076] Step S4: Workpiece rotation and hammering device feed

[0077] Workpiece rotation: The machine tool is started synchronously, and the chuck 19 drives the workpiece 22 to rotate, ensuring that all parts of the inner wall of the workpiece 22 are evenly hammered.

[0078] Hammering device feed: The tailstock 20 and the hammering device continue to move along the slide rail 18 via the motor 21, feeding gradually to ensure that the hammering of the alloy impact head 602 covers the entire inner wall of the workpiece 22.

[0079] The workpiece 22, the hammering device, and the sliding support 26 are arranged coaxially to reduce vibration and improve stability. Driven by the motor 21 and the lead screw 23, the tailstock 20 moves precisely, ensuring the hammering device accurately enters the workpiece 22. The pneumatic linear vibrator 17 and the spring 14 work together to achieve rapid reciprocating motion of the hammer head 6, ensuring high hammering efficiency. The rotation of the workpiece 22 and the feed of the hammering device ensure that the alloy impact head 602 evenly covers the entire inner wall of the workpiece 22.

[0080] 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. An automatic hammering strengthening device for internal holes, characterized in that: The device includes a hammering device installed on the tailstock (20) of the machine tool. The end of the hammering device is provided with multiple radially reciprocating hammer heads (6). The hammer heads (6) are placed inside the workpiece (22) installed on the machine tool chuck (19) to hammer and strengthen its inner wall. The machine tool slide rail (18) is provided with a sliding support seat (26) for supporting the hammering device. The hammering device includes a transmission rod assembly that slides inside the housing assembly. The housing assembly includes an outer tube (2) and a transition tube (3). A hammering sleeve (4) is fixed at the end of the transition tube (3). An end cap (7) is fixed at the end of the hammering sleeve (4). A sliding hammer core shaft (5) is provided inside the hammering sleeve (4). The bottom of the hammering head (6) is locked on the hammer core shaft (5) and slides. A pneumatic linear vibrator (17) is provided at one end of the transmission rod assembly, and the other end is connected to the hammer core shaft (5).

2. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The outer tube (2) is fixed to the bottom tube (1), and the bottom tube (1) is fixed to the tailstock (20) of the machine tool. The linear vibrator (17) is installed inside the bottom tube (1).

3. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The transmission rod assembly includes a transmission rod (9), an extension rod (10), and a connecting rod (13) connected in sequence. The end of the transmission rod (9) is fixedly connected to the hammer core shaft (5). A ball bearing sleeve (8) is provided between the hammer core shaft (5) and the hammer sleeve (4). The hammer core shaft (5) slides against the hammer sleeve (4) through the ball bearing sleeve (8).

4. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The outer tube (2) is provided with multiple linear bearing supports (11), and the extension rod (10) in the transmission rod assembly slides against the linear bearing support (11).

5. The automatic hammering strengthening device for internal holes according to claim 3, characterized in that: A boss is fixed on the outer side of the end of the connecting rod (13), and a fixing ring (12) is fixed inside the outer tube (2). A spring (14) is provided between the fixing ring (12) and the boss. The spring (14) is sleeved on the connecting rod (13), with one end abutting against the boss and the other end abutting against the fixing ring (12). A first pressure block (15) is fixed at the tail of the connecting rod (13), and a second pressure block (16) is fixed at the end of the linear vibrator (17). The second pressure block (16) is coaxially arranged with the first pressure block (15), and the second pressure block (16) abuts against the first pressure block (15).

6. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The hammer shaft (5) has multiple inclined surfaces (501) on its outer side, and dovetail grooves (502) on the inclined surfaces (501). The hammer head (6) has a dovetail block (605) at its bottom, and the dovetail block (605) slides against the dovetail groove (502).

7. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The hammer sleeve (4) and the end cap (7) are provided with multiple corresponding grooves, which are spliced ​​together to form a slot (27), and the hammer head (6) slides in the slot (27).

8. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: The top of the sliding seat (604) in the hammer head (6) is provided with multiple mounting holes. The mounting holes are provided with alloy impact heads (602). The bottom of the alloy impact head (602) is fixed in the mounting holes by a support cylinder (606). The end face of the sliding seat (604) is provided with a pressure cap (601). The two ends of the pressure cap (601) are fixedly connected to the sliding seat (604) by bolts, thereby pressing and fixing the alloy impact head (602).

9. The automatic hammering strengthening device for internal holes according to claim 1, characterized in that: A fixed seat (25) is fixed at the tail of the machine tool, and a motor (21) is fixed on the fixed seat (25). A rotating lead screw (23) is provided between the slide rails (18) of the machine tool. One end of the lead screw (23) is connected to the output shaft of the motor (21), and the other end is rotated against the machine tool through a bearing seat. The bottom of the tailstock (20) is threadedly connected to the lead screw (23) through a threaded sleeve (24).

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