High lock bolt tail end punching device

Abstract

This utility model discloses a drilling device for the tail end of a high-strength bolt, relating to the field of high-strength bolt processing technology. It solves the problem of workpiece quality being affected by the machining head's feed motion being out of sync with the workpiece. The device includes: a countersinking mechanism, comprising a countersinking head, a rotary drive assembly for controlling the countersinking head's rotation, and a first feed control assembly for controlling the countersinking head's feed motion; a drilling mechanism, comprising a drill bit, a rotary drive assembly for controlling the drill bit's rotation, and a first feed control assembly for controlling the drill bit's feed motion; a punching mechanism, comprising a punch and a second feed control assembly for controlling the punch's feed motion; and a chip removal mechanism, comprising a milling head, a rotary drive assembly for controlling the milling head's rotation, and a first feed control assembly for controlling the milling head's feed motion. This device ensures that the machining head's position does not shift, and that the machining head is coaxial with the workpiece, thereby improving machining accuracy and product quality.

Description

Technical Field

[0001] This utility model relates to the field of high-strength bolt processing technology, and in particular to a device for drilling holes at the tail end of a high-strength bolt. Background Technology

[0002] Aviation bolts with a star-shaped or hexagonal hole at the end are high-lock bolts, also known as high-tightening bolts or locking bolts. They are a common and essential high-performance fastener in the aerospace industry. The hexagonal hole at the end of the high-lock bolt is machined using a machine tool.

[0003] Existing technologies, such as the high-strength bolt tail end full-process machining machine with publication number CN114750001A, mention that a dotting structure is used to achieve dotting lubrication for drilling and punching during the machining process. As is well known, the materials of aviation high-strength bolts are mostly high-strength TC4 titanium alloy, and a small portion are high-strength high-temperature alloys of A286 or Inconel 718. The common processing cooling and lubrication method for workpieces made of this material, both domestically and internationally, is to spray cooling oil or coolant at a high flow rate to achieve cooling and lubrication during the drilling and punching process. The fundamental reason for the use of dotting cooling and lubrication described in this patent application is the serious defect in its design structure. All motors, cables, couplings, spindle bearings, linear guides, translation mechanism slides, etc., are directly exposed to areas where oil can splash directly due to this defective design structure. Therefore, it is impossible to achieve sealing and protection against oil splash, and the only way to avoid corrosion and damage to the above components is by dripping oil. This is also an important reason why this product cannot be widely promoted.

[0004] Finally, all the drilling and punching servo drive devices in this patent application use stepped linear guide structures with different axes (which generate significant overturning torque) instead of coaxial cylindrical guide structures (which have no overturning torque). Therefore, the servo drive devices in this patent application have poor rigidity and large deformation after being subjected to force, which is not suitable for the processing of aerospace fasteners with extremely high coaxiality accuracy requirements. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned problems by designing a high-strength bolt end drilling device, which solves the problem that the workpiece quality is affected by the fact that the machining head is not aligned with the workpiece during the feed motion.

[0006] The technical solution of this utility model to achieve the above objectives is a drilling device for the tail end of a high-strength bolt, which comprises, in sequence: A countersinking mechanism is used to machine a center hole at the tail end of a high-strength bolt. The countersinking mechanism includes a countersinking head, a rotation control component for controlling the rotation of the countersinking head, and a first feed control component for controlling the feed motion of the countersinking head. A drilling mechanism for drilling at a center hole, the drilling mechanism including a drill bit, a rotation control assembly for controlling the rotation of the drill bit, and a first feed control assembly for controlling the feed motion of the drill bit; A punching mechanism for punching an inner corner hole at a center hole, the punching mechanism including a punch and a second feed control assembly for controlling the feed movement of the punch; A chip removal mechanism is used to remove residual chips inside an inner corner hole. The chip removal mechanism includes a milling head, a rotation control assembly for controlling the rotation of the milling head, and a first feed control assembly for controlling the feed motion of the milling head. The first feed control component includes a first housing, a guide sleeve inserted into the first housing, an anti-rotation block connected to the outside of the guide sleeve, and a first servo motor connected to the anti-rotation block via a lead screw. The lead screw is threadedly connected to a lead screw nut fixed on the anti-rotation block. The anti-rotation block is slidably connected to a guide hole on the first housing. The rotation control component is disposed on the guide sleeve.

[0007] Preferably, guide bushings are provided at the front and rear ends of the insertion hole on the first housing, and the two ends of the guide bushing are respectively inserted and connected to the two guide bushings.

[0008] Preferably, the contact surface between the guide bushing and the guide sleeve is provided with a threaded groove to facilitate lubricant wetting the surface of the guide sleeve.

[0009] Preferably, the front and rear ends of the first housing are respectively provided with feed end caps for enclosing the guide sleeve inside the first housing.

[0010] Preferably, the first feed control assembly further includes a second housing, which is fixed to one side of the first housing having a guide hole. The anti-rotation block extends into the second housing and is movable relative to the second housing. The first servo motor is fixedly mounted on the second housing. The output shaft of the first servo motor is connected to a lead screw via a coupling. The other end of the lead screw is threadedly connected to a lead screw nut fixed on the anti-rotation block.

[0011] Preferably, the rotation control assembly includes a rotary mandrel passing through the guide sleeve and a second servo motor driving the rotary mandrel to rotate. The front and rear ends of the rotary mandrel are rotatably connected to the guide sleeve through bearings. The second servo motor is fixedly installed at the rear end of the guide sleeve. A rotary end cap is provided at the front end of the guide sleeve to enclose the bearing inside the guide sleeve.

[0012] Preferably, a tool holder is provided at the front end of the rotary mandrel, and the countersink / drill / milling head is mounted at the front end of the tool holder.

[0013] Preferably, the second feed control assembly includes a third housing, a guide mandrel sleeve inserted into the third housing, a lead screw threadedly connected to a lead screw nut fixed at the rear end of the guide mandrel sleeve, a reducer connected to the other end of the lead screw via a coupling, a third servo motor connected to the input end of the reducer, and an anti-rotation block connected to the outside of the guide mandrel sleeve, wherein the anti-rotation block is slidably connected to a guide hole on the third housing.

[0014] Preferably, the front end of the guide mandrel sleeve is provided with an adapter sleeve, the front end of the adapter sleeve is provided with a tool holder seat, and the punch is installed at the front end of the tool holder seat.

[0015] Its advantages over existing technologies are: The workpiece of this utility model sequentially passes through a countersinking mechanism, a drilling mechanism, a punching mechanism, and a chip removal mechanism. The rotation control component of the countersinking mechanism controls the rotation of the countersink head, and the first feed control component controls the feed movement of the countersink head, machining a central hole at the tail end of the high-strength bolt. This central hole is coaxial with the high-strength bolt. Next, the drilling mechanism machines a circular hole along the center, and the punching mechanism punches an inner corner hole along the circular hole. Finally, the milling head of the chip removal mechanism rotates and feeds, stirring and cleaning out the residual chips at the bottom of the inner corner hole, thus completing all the machining processes for the inner corner hole on the high-strength bolt.

[0016] The rotation control assembly is mounted on the guide sleeve. When the first servo motor operates, it drives the lead screw to rotate. The rotation of the lead screw transmits power to the anti-rotation block, which is slidably connected to the guide hole on the first housing. Restricted by the guide hole, the anti-rotation block cannot rotate. With the cooperation of the lead screw and lead screw nut, the rotational force is converted into axial force, causing the anti-rotation block to slide along the guide hole. This, in turn, causes the guide sleeve to extend and retract relative to the first housing, ultimately achieving the feed motion of the countersink / drill / milling head. Furthermore, the interlocking hole on the first housing ensures that the position of the countersink / drill / milling head does not shift, and the countersink / drill / milling head is coaxial with the workpiece, thereby improving the product's machining accuracy and further enhancing the machining quality of the high-strength bolts. Similarly, the first feed control assembly also controls the punch feed motion, ensuring that its position does not shift.

[0017] Important transmission structures such as lead screws and guide sleeves are located inside the housing, making it difficult for fine iron filings generated during processing to enter the housing, effectively preventing the transmission structure from jamming. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the high-strength bolt end drilling device; Figure 2 This is a cross-sectional view of the countersinking mechanism in the high-strength bolt tail end drilling device; Figure 3This is a schematic diagram of the axial structure of the countersinking mechanism in the high-strength bolt tail end drilling device; Figure 4 This is a schematic diagram of the tool holder. Figure 5 This is a cross-sectional view of the punching mechanism in the high-strength bolt tail end punching device; Figure 6 This is a schematic diagram of the axial structure of the punching mechanism in the high-strength bolt tail-end punching device.

[0019] In the diagram, 1. Countersinking mechanism; 11. Countersinking head; 12. Rotation control assembly; 121. Second servo motor; 122. Mandrel; 13. First feed control assembly; 131. First housing; 132. Second housing; 133. Guide sleeve; 134. First servo motor; 135. Anti-rotation block; 136. Rotation end cover; 137. Feed end cover; 2. Drilling mechanism; 21. Drill bit; 3. Punching mechanism; 31. Punch; 32. Second feed control assembly; 321. Third housing; 322. Reducer; 323. Third servo motor; 324. Guide mandrel sleeve; 325. Adapter sleeve; 4. Chip removal mechanism; 41. Milling head; 5. Pad plate; 6. Tool holder; 7. Connector; 8. Lead screw; 9. Guide key; 10. Guide bushing. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] A preferred embodiment of this utility model provides a drilling device for the tail end of a high-strength bolt. This drilling device is generally set vertically and is used to open an internal hexagonal hole at the tail end (i.e., the end away from the head) of the high-strength bolt.

[0022] See Figure 1 Specifically, the drilling device mainly consists of a countersinking mechanism 1, a drilling mechanism 2, a punching mechanism 3, and a chip removal mechanism 4. These four mechanisms are arranged sequentially according to the processing order. The countersinking mechanism 1, drilling mechanism 2, and chip removal mechanism 4 have somewhat similar structures, differing only in their function and the cutting heads they use.

[0023] like Figure 2 , Figure 3As shown, the countersinking mechanism 1 mainly consists of a first feed control assembly 13, a rotation control assembly, and a countersinking head 11. The first feed control assembly 13 includes a first housing 131, a second housing 132, a guide sleeve 133, an anti-rotation block 135, a first servo motor 134, and other components. The second housing 132 is fixedly mounted on the first housing 131, and the two are connected by a guide hole extending along the length of both housings. The anti-rotation block 135 can slide along the guide hole. The first housing 131 is generally fixedly mounted on a pad 5 and mounted on the machine tool via the pad 5.

[0024] A guide key 9 is provided on each side of the guide hole on the first housing 131. The anti-rotation block 135 is located between the two guide keys 9 and slides in contact with the guide keys 9. The guide keys 9 guide the sliding of the anti-rotation block 135 and restrict the rotation of the anti-rotation block 135.

[0025] The first housing 131 has a through hole that extends from front to back. The guide sleeve 133 is inserted into the through hole, and both ends of the guide sleeve 133 extend out of the through hole by a certain length so as to allow for a certain amount of space when the guide sleeve 133 moves telescopically relative to the through hole.

[0026] A guide sleeve 10 is provided at each of the front and rear ends of the through hole, and the guide sleeve 133 is slidably connected to the two guide sleeves 10 through the through hole. The anti-rotation block 135 is fixedly installed on the outside of the guide sleeve 133. The lower end of the anti-rotation block 135 is embedded in the groove on the outer wall of the guide sleeve 133 and fixed by bolts. The upper end of the anti-rotation block 135 extends into the second housing 132 through the guide hole.

[0027] Each guide sleeve 10 and guide sleeve 133 has a threaded groove extending from its contact surface. The threaded groove is used to inject lubricant, so that the lubricant can wet the surface of the guide sleeve 133 and allow the guide sleeve 133 to slide axially relative to the guide sleeve 10.

[0028] A feed end cover 137 is provided at each of the front and rear ends of the first housing 131. The feed end cover 137 is fixedly connected to the first housing 131 by bolts and is used to seal and fix the guide sleeve 10 in the through hole of the first housing 131.

[0029] The first servo motor 134 is fixedly installed on the outer end of the second housing 132. The output shaft of the first servo motor 134 is connected to the lead screw 8 through a coupling. The lead screw is located inside the second housing 132. One end of the lead screw connected to the output shaft of the motor is rotatably connected to the second housing 132 through a bearing, and the other end is threadedly connected to the lead screw nut fixed on the upper end of the anti-rotation block 135.

[0030] The first servo motor 134 drives the lead screw 8 to rotate. Since the anti-rotation block 135 will not rotate due to the restriction of the guide hole, the guide sleeve 133 connected to the anti-rotation block 135 will also not rotate. Therefore, the lead screw 8 will drive the anti-rotation block 135 to slide along the guide hole, thereby driving the guide sleeve 133 to move axially and extend relative to the through hole on the first housing 131, and then controlling the feeding motion of the countersink 11.

[0031] See Figure 2 The rotation control assembly 12 is mounted on the guide sleeve 133. This rotation control assembly 12 mainly consists of a rotary spindle 122 and a second servo motor 121. The second servo motor 121 is fixedly mounted at the rear end of the guide sleeve 133. The rotary spindle 122 is located inside the guide sleeve 133, and its front and rear ends are rotatably connected to the two ends of the guide sleeve 133 via ball bearings. The output shaft of the second servo motor 121 is connected to the rear end of the rotary spindle 122 via a coupling, driving the rotary spindle 122 to rotate relative to the guide sleeve 133.

[0032] Three ball bearings, a spacer, a locking sleeve, and an adjusting nut are arranged near the front end of the rotary spindle 122. The adjusting nut is threaded onto the front end of the rotary spindle 122 and is flush with the front end face of the guide sleeve 133. A sealing ring is provided on the inner ring of the adjusting nut. The spacer is fitted onto the rotary spindle 122, with two ball bearings located between the adjusting nut and the spacer, and the other ball bearing located on the other side of the spacer. The locking sleeve is fixedly installed on the rotary spindle 122 and is tightly against the ball bearings, so that the three ball bearings, the spacer, and the adjusting nut are tightly against each other.

[0033] A locking sleeve, a bearing housing end cover, and two ball bearings are located near the rear end of the rotary spindle 122. The two ball bearings are close together. The locking sleeve is fixedly installed at the rear end of the rotary spindle 122, between the ball bearings and the coupling. The bearing housing end cover is sleeved on the rotary spindle 122 and fixedly connected to the guide sleeve 133 by bolts. The bearing housing end cover is located outside the locking sleeve, sealing both the locking cover and the ball bearings within the guide sleeve 133.

[0034] A rotary end cap 136 is provided at the front end of the guide sleeve 133. The rotary end cap 136 can be threaded to the guide sleeve 133, or it can be fixed to the guide sleeve 133 or an adjusting nut by bolts. The rotary end cap 136 seals the front end of the guide sleeve 133, thus preventing dust.

[0035] The front end of the rotary spindle 122 passes through the rotary end cover 136 and extends a certain length. A tool holder 6 is provided at the front end of the rotary spindle 122, and the countersink 11 is installed at the front end of the tool holder 6. The rear end of the tool holder 6 is inserted into a slot at the front end of the rotary spindle 122, and the slot is tapered.

[0036] See Figure 2 , Figure 4 A connector 7 is provided at the rear end of the tool holder 6. One end of the connector 7 is inserted into the slot at the front end of the rotary spindle 122, and the other end of the connector 7 is inserted into the tool holder 6, with a tapered surface fit between them. An internal hex bolt is provided near the rear end of the tool holder 6. This internal hex bolt passes through the rotary spindle 122 and the tool holder 6 and is threaded to the connector 7. Tightening the internal hex bolt with a wrench causes the tapered surface of the connector 7 to press against the tool holder 6, thus giving the tool holder 6 a tendency to move axially towards the rear end of the rotary spindle 122, thereby fixing the tool holder 6 onto the rotary spindle 122 and preventing it from detaching.

[0037] When the second servo motor 121 drives the rotary spindle 122 to rotate, it will drive the countersink 11 to rotate. When the first servo motor 134 controls the guide sleeve 133 to feed, it will drive the structure including the second servo motor 121, the rotary spindle 122 and the countersink 11 to feed together. That is, the first feed control component 13 and the rotation control component 12 will not interfere with each other when they are working, and at the same time, the accuracy of axial movement can be guaranteed.

[0038] like Figure 1 As shown, the drilling mechanism 2 mainly includes a first feed control component 13, a rotation control component, and a drill bit 21. Except for the structure and function of the processing head (i.e., the drill bit 21), the other structures and installation methods are the same as those of the counterboring mechanism 1, so they will not be described in detail here.

[0039] Similarly, the chip removal mechanism 4 has the same structure as the countersinking mechanism 1 and the drilling mechanism 2. The front end of the chip removal mechanism 4 is a milling head 41. When the punching mechanism 3 punches the tail end of the high-strength bolt, it will push the waste chips into the bottom of the hole. The waste chips will remain at the bottom of the hole. At this time, the milling head 41 will extend into the hole to stir and clean out the remaining waste chips.

[0040] like Figure 4 , Figure 5As shown, the punching mechanism 3 mainly includes a punch 31 and a second feed control assembly 32 that controls the feed movement of the punch 31. The second feed control assembly 32 has a similar structure to the first feed control assembly 13. The second feed control assembly 32 mainly consists of a third housing 321, a guide mandrel sleeve 324, a lead screw 8, a lead screw nut, a reducer 322, and a third servo motor 323. The third housing 321 is generally fixed to a pad 5 and mounted on the machine tool via the pad 5. The rear end of the guide mandrel sleeve 324 is inserted into the third housing 321 from the front end and passes through a through hole on the third housing 321. A guide sleeve 10 is disposed in this through hole, and the guide mandrel sleeve 324 passes through the guide sleeve 10.

[0041] Both the guide bushing 10 and the guide mandrel bushing 324 have threaded grooves extending outwards, i.e. threaded grooves. The threaded grooves are used to inject lubricating fluid, so that the lubricating fluid can wet the surface of the guide mandrel bushing 324, so that the guide mandrel bushing 324 can slide axially relative to the guide bushing 10.

[0042] A feed end cover 137 is provided at the front end of the third housing 321. The feed end cover 137 is fixedly connected to the third housing 321 by bolts and is used to seal and fix the guide sleeve 10 in the through hole of the third housing 321.

[0043] The lead screw nut is fixedly installed at the rear end of the guide mandrel sleeve 324. One end of the lead screw 8 passes through the lead screw nut and can extend into the guide mandrel sleeve 324. The guide mandrel sleeve 324 is hollow. The lead screw 8 and the lead screw nut are connected by threads. The output shaft of the third servo motor 323 is connected to the input end of the reducer 322. The reducer 322 is fixedly installed at the rear end of the third housing 321. The output end of the reducer 322 is connected to the end of the lead screw 8 away from the lead screw nut via a coupling. The lead screw 8 is rotatably connected to the third housing 321 via a bearing. A bearing seat end cover is also provided at the rear end of the third housing 321. This bearing seat end cover is located inside the third housing 321 and is fixed to the third housing 321 by bolts. The bearing seat end cover seals and fixes the bearing inside the third housing 321.

[0044] The third housing 321 also has a guide hole. An anti-rotation block 135 is located on the outer side of the guide mandrel sleeve 324 near the rear end. The lower end of the anti-rotation block 135 is embedded in a groove on the outer wall of the guide mandrel sleeve 324 and fixed thereto by bolts. The upper end of the anti-rotation block 135 extends into the guide hole. A guide key 9 is provided on each side of the guide hole. The anti-rotation block 135 is located between the two guide keys 9 and slides in contact with them. The guide keys 9 guide the sliding of the anti-rotation block 135 and simultaneously restrict its rotation.

[0045] A roller is provided on the anti-rotation block 135, and the roller makes rolling contact with the guide key 9 to reduce the friction when the anti-rotation block 135 slides.

[0046] An adapter sleeve 325 is provided at the front end of the guide mandrel sleeve 324, and a tool holder 6 is provided at the front end of the adapter sleeve 325. The punch 31 is installed at the front end of the tool holder 6. The specific installation method of the tool holder 6 is the same as that in the counterboring mechanism 1 described above, and will not be described in detail here.

[0047] When the third servo motor 323 is working, it transmits power to the lead screw 8 through the reducer 322, driving the lead screw 8 to rotate. Because the anti-rotation block 135 is restricted by the guide hole and will not rotate, the guide sleeve 133 connected to the anti-rotation block 135 will also not rotate. When the lead screw 8 rotates, the rotational force is converted into axial force through the engagement of the lead screw nut. Therefore, the lead screw 8 drives the anti-rotation block 135 to slide along the guide hole, thereby causing the guide mandrel sleeve 324 to move axially relative to the through hole on the third housing 321, thus controlling the feed motion of the punch 31.

[0048] In other words, the punch 31 of the punching mechanism 3 can only move forward and backward and will not rotate.

[0049] During processing, the countersinking mechanism 1 first controls the rotation and feed motion of the countersinking head 11 to countersink a center hole at the tail end of the high-strength bolt for subsequent finishing. This center hole is coaxial with the central axis of the high-strength bolt. Next, the drilling mechanism 2 controls the rotation and feed motion of the drill bit 21 to process the center hole, forming a circular hole. Then, the punching mechanism 3 controls the feed motion of the punch 31 to punch an internal hexagonal hole in the circular hole. Finally, the chip removal mechanism 4 controls the rotation and feed motion of the milling head 41 to agitate and clean out the chips punched into the internal hexagonal hole, completing the chip removal process. Furthermore, this device has advantages such as high rigidity and resistance to deformation under stress, making it suitable for processing aerospace fasteners with extremely high coaxiality precision requirements.

[0050] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A device for drilling holes at the tail end of a high-strength bolt, characterized in that, The punching device comprises, in sequence: A countersinking mechanism (1) is used to process a center hole at the tail end of a high-strength bolt. The countersinking mechanism (1) includes a countersink (11), a rotation control assembly (12) for controlling the rotation of the countersink (11), and a first feed control assembly (13) for controlling the feed motion of the countersink (11). Drilling mechanism (2) for drilling at a center hole, the drilling mechanism (2) includes a drill bit (21), a rotation control assembly (12) for controlling the rotation of the drill bit (21) and a first feed control assembly (13) for controlling the feed motion of the drill bit (21); A punching mechanism (3) is used to punch an inner corner hole at the center hole. The punching mechanism (3) includes a punch (31) and a second feed control assembly (32) for controlling the feed movement of the punch (31). The chip removal mechanism (4) is used to remove residual chips in the inner corner hole. The chip removal mechanism (4) includes a milling head (41), a rotation control component (12) for controlling the rotation of the milling head (41), and a first feed control component (13) for controlling the feed motion of the milling head (41). The first feed control component (13) includes a first housing (131), a guide sleeve (133) that is inserted and connected to the first housing (131), an anti-rotation block (135) that is connected to the outside of the guide sleeve (133), and a first servo motor (134) that is connected to the anti-rotation block (135) through a lead screw (8). The lead screw (8) is threadedly connected to a lead screw nut fixed on the anti-rotation block (135). The anti-rotation block (135) is slidably connected to a guide hole on the first housing (131). The rotation control component (12) is disposed on the guide sleeve (133).

2. The high-strength bolt end drilling device according to claim 1, characterized in that, Guide sleeves (10) are respectively provided at the front and rear ends of the through hole on the first housing (131), and the two ends of the guide sleeve (133) are respectively inserted and connected to the two guide sleeves (10).

3. The high-strength bolt tail end drilling device according to claim 2, characterized in that, The guide bushing (10) and the guide sleeve (133) have threaded grooves on their contact surfaces to facilitate lubricant penetration into the surface of the guide sleeve (133).

4. The high-strength bolt end drilling device according to claim 2, characterized in that, The first housing (131) is provided with feed end caps (137) at its front and rear ends, respectively, for enclosing the guide bushing (10) inside the first housing (131).

5. The high-strength bolt end drilling device according to claim 1, characterized in that, The first feed control assembly (13) also includes a second housing (132), which is fixed to one side of the first housing (131) having a guide hole. The anti-rotation block (135) extends into the second housing (132) and is movable relative to the second housing (132). The first servo motor (134) is fixedly mounted on the second housing (132). The output shaft of the first servo motor (134) is connected to the lead screw (8) via a coupling. The other end of the lead screw (8) is threadedly connected to the lead screw nut fixed on the anti-rotation block (135).

6. The high-strength bolt end drilling device according to claim 1, characterized in that, The rotation control assembly (12) includes a rotary spindle (122) passing through a guide sleeve (133) and a second servo motor (121) driving the rotary spindle (122) to rotate. The front and rear ends of the rotary spindle (122) are rotatably connected to the guide sleeve (133) through bearings. The second servo motor (121) is fixedly installed at the rear end of the guide sleeve (133). The front end of the guide sleeve (133) is provided with a rotary end cap (136) for enclosing the bearing inside the guide sleeve (133).

7. The high-strength bolt end drilling device according to claim 6, characterized in that, The front end of the rotary spindle (122) is provided with a tool holder (6), and the countersink (11) / drill (21) / milling head (41) is installed at the front end of the tool holder (6).

8. The high-strength bolt end drilling device according to claim 1, characterized in that, The second feed control assembly (32) includes a third housing (321), a guide mandrel sleeve (324) that is inserted into the third housing (321), a lead screw (8) that is threadedly connected to a lead screw nut fixed at the rear end of the guide mandrel sleeve (324), a reducer (322) that is connected to the other end of the lead screw (8) via a coupling, a third servo motor (323) that is connected to the input end of the reducer (322), and an anti-rotation block (135) that is connected to the outside of the guide mandrel sleeve (324). The anti-rotation block (135) is slidably connected to the guide hole on the third housing (321).

9. The high-strength bolt end drilling device according to claim 8, characterized in that, The front end of the guide mandrel sleeve (324) is provided with an adapter sleeve (325), the front end of the adapter sleeve (325) is provided with a tool holder seat (6), and the punch (31) is installed at the front end of the tool holder seat (6).

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