An explosive impact ball extrusion integrated bushing

Abstract

The present invention belongs to the technical field of aviation machinery manufacturing, and discloses an explosive impact ball extrusion integrated bushing, comprising: a press-fit bushing, which is inserted into a hole to be strengthened of a substrate; an intermediate sleeve, which is sleeved on the press-fit bushing and abuts against the substrate; an inner cavity of the intermediate sleeve is filled with an impact ball that is movably arranged, and the kinetic energy of the impact ball is transmitted to the press-fit bushing through impact; an explosion tube, which is detachably connected to the top of the intermediate sleeve, and an explosion assembly and a detonation assembly are arranged in the explosion tube, and the detonation assembly is arranged corresponding to the explosion assembly to control the detonation of the explosion assembly. The present invention has a simple structure and is easy to use. It can perform cold extrusion on fasteners that are not easy to move and fasteners with high hardness, reduce the cost of the cold extrusion process, improve the versatility of the cold extrusion process, reduce the problems caused by the stress concentration phenomenon at the fastener holes of aircraft, and extend the fatigue life of the aircraft.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation machinery manufacturing, and in particular relates to an explosion impact ball-extruded integrated bushing. Background Art

[0002] The various components of an aircraft have a large number of hole structures, and fasteners pass through these hole structures to connect them tightly. However, due to the existence of structural holes, the aircraft is subjected to reciprocating loads during takeoff, landing and flight, and cracks are prone to appear around the structural holes, reducing the service life of the aircraft. Strengthening the hole structure is an economical and effective way to increase the life of the aircraft.

[0003] The hole cold extrusion strengthening and anti-fatigue technology mainly introduces residual stress at the edge of the structural hole through various technical methods to improve the fatigue life of the structural hole, thereby reducing the crack propagation of the material around the hole. Plastic deformation occurs during the hole cold extrusion strengthening process, which will cause crystal slip, crystal deformation, and increase the number of dislocations. The irregular and overlapping distribution of dislocations forms a stress strengthening layer that hinders dislocation slip, increases the yield strength of the material, and increases the fatigue resistance of the structural hole. At the same time, the extrusion process will improve the appearance characteristics of the hole wall of the structural hole, remove the unevenness of the material caused by the previous processing process, reduce the surface roughness of the hole wall of the structural hole, reduce the stress concentration area, reduce the probability of microcracks in the material, improve the fatigue resistance of the structural hole, and increase the fatigue life of the hole. However, the existing hole extrusion strengthening scheme has complex operation steps, high cost, and unsatisfactory production efficiency, which is not convenient for large-scale promotion and use.

[0004] Therefore, the present application designs an explosion impact ball extrusion integrated bushing to solve the above technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes an explosive impact ball-extruded integrated bushing, which realizes ball extrusion of the bushing through explosive impact extrusion, applies a larger extrusion force, and thus improves the fatigue life of the connecting hole.

[0006] To achieve the above object, the present invention provides an explosive impact ball extrusion integrated bushing, comprising:

[0007] A press-fit bushing, wherein the press-fit bushing is inserted into the hole to be strengthened of the substrate;

[0008] An intermediate sleeve, which is sleeved on the press-fit bushing and abuts against the base material; an inner cavity of the intermediate sleeve is filled with a movable impact ball, and the kinetic energy of the impact is transmitted to the press-fit bushing through the impact;

[0009] An explosive tube, which is detachably connected to the top end of the intermediate sleeve, wherein an explosive assembly is arranged inside the explosive tube, and the explosion shock generated by the explosive assembly is transmitted to the inner cavity of the intermediate sleeve and acts on the impact ball; wherein a detonating assembly is arranged inside the explosive tube, and the detonating assembly is arranged corresponding to the explosive assembly for controlling the detonation of the explosive assembly.

[0010] Preferably, the press-fit bushing includes an embedded tube inserted into the hole to be strengthened and tightly fitted with the hole to be strengthened, the embedded tube extends out of the hole to be strengthened and is sleeved and fixed with a clamping plate, the outer edge of the clamping plate is larger than the hole to be strengthened, and the intermediate sleeve is sleeved outside the clamping plate.

[0011] Preferably, the inner cavity of the intermediate sleeve is provided with a guide block, the bottom end of the guide block abuts against the top end of the clamping plate, the top end of the guide block is provided with a conical impact groove, the bottom end of the impact groove is adapted to and connected with the inner cavity of the embedded tube, and the outlet at the bottom end of the impact groove is smaller than the diameter of the impact ball.

[0012] Preferably, a threaded barrel is provided at the top end of the intermediate sleeve, a threaded groove matched with the threaded barrel is provided at the bottom end of the explosive barrel, and the threaded barrel is threadably connected to the threaded groove.

[0013] Preferably, the explosion assembly includes a mounting groove provided at the top of the inner cavity of the explosion tube, an explosive having an explosive effect is embedded and fixed in the mounting groove, a detonator is abutted against the top of the explosive, and the detonator is arranged corresponding to the detonation assembly.

[0014] Preferably, the detonating assembly includes a detonating groove opened at the top of the mounting groove, a firing pin is slidably arranged in the detonating groove, and the bottom end of the firing pin strikes the explosive and detonates the explosive.

[0015] Preferably, a detonating spring in a compressed state is provided at the top of the detonating groove, the detonating spring is fixedly connected to the top of the firing pin, and the detonating spring pushes the firing pin to hit the explosive.

[0016] Preferably, a locking groove is provided on the side wall of the explosive tube, a locking plate is slidably connected in the locking groove, a middle hole is provided on the locking plate, and the middle hole is arranged corresponding to the detonating groove. When the middle hole is aligned with the detonating groove, the firing pin passes through the middle hole and hits the detonator.

[0017] Preferably, a locking spring is provided in the locking groove, and the locking spring is fixedly connected to the end of the locking plate. When the middle hole is aligned with the detonation groove, the locking spring is in a compressed state.

[0018] Preferably, a locking hole is formed through a side of the locking plate away from the locking spring, and a locking pin is fitted in the locking hole.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses an integrated ball-extruded bushing for explosive impact, which uses an explosive impact loading method to squeeze the impact force of the explosion through an impact ball to strengthen the hole to be strengthened; when in use, the pressed bushing is inserted into the hole to be strengthened, and then the explosion tube is installed on the top of the intermediate sleeve, and then the intermediate sleeve is pressed onto the pressed bushing and against the panel of the substrate, and the explosive assembly is detonated through the detonation assembly, and the shock wave and high-temperature gas generated by the explosion of the explosive assembly enter the inner cavity of the intermediate sleeve, increasing the pressure in the intermediate sleeve, and these shock waves and pressures act on the impact ball and are transmitted to the pressed bushing through the impact ball, causing deformation of the pressed bushing, thereby strengthening the hole to be strengthened, and it is convenient to install and disassemble after strengthening is completed, without the need to use large-scale extrusion equipment and cutting, thus saving time and effort and reducing costs.

[0020] The present invention has a simple structure and is easy to use. It can perform cold extrusion on fasteners that are difficult to move and fasteners with high hardness, reduce the cost of the cold extrusion process, improve the versatility of the cold extrusion process, reduce the problems caused by stress concentration at the holes of aircraft fasteners, and extend the fatigue life of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 An axial view of the ball-extruded one-piece bushing for explosive impact of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the ball-extruded integrated bushing for explosive impact of the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial enlarged view of middle A;

[0025] Figure 4 An axial view of the press-fit bushing of the present invention;

[0026] Figure 5 An axial view of the detonation assembly of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the intermediate sleeve of the present invention;

[0028] In the figure: 1. base material; 2. press-fit bushing; 3. intermediate sleeve; 4. explosive tube; 11. hole to be strengthened; 21. embedded tube; 22. snap-in plate; 31. impact ball; 32. guide block; 33. impact groove; 34. threaded tube; 35. receiving groove; 41. threaded groove; 42. mounting groove; 43. explosive; 44. detonator; 45. detonating groove; 46. firing pin; 47. detonating spring; 48. top plate; 49. locking groove; 410. locking plate; 411. intermediate hole; 412. locking spring; 413. locking hole; 414. locking pin; 415. guide groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 6 As shown, this embodiment provides a ball-extruded integrated bushing for explosive impact, comprising:

[0032] Pressing the bushing 2, the bushing 2 is inserted into the hole 11 to be strengthened of the substrate 1;

[0033] The intermediate sleeve 3 is sleeved on the press-fit bushing 2 and abuts against the base material 1; the inner cavity of the intermediate sleeve 3 is filled with a movable impact ball 31, and the kinetic energy of the impact ball 31 is transmitted to the press-fit bushing 2 through impact;

[0034] The explosive tube 4 is detachably connected to the top end of the middle sleeve 3. An explosive assembly is arranged inside the explosive tube 4. The explosion shock generated by the explosive assembly is transmitted to the inner cavity of the middle sleeve 3 and acts on the impact ball 31. An detonating assembly is arranged inside the explosive tube 4. The detonating assembly is arranged corresponding to the explosive assembly and is used to control the detonation of the explosive assembly.

[0035] The present invention discloses an integrated ball-extruded bushing for explosive impact. Through the loading method of explosive impact, the impact force of the explosion is ball-extruded through an impact ball 31 to strengthen the hole 11 to be strengthened. When in use, the pressed bushing 2 is inserted into the hole 11 to be strengthened, and then the explosion tube 4 is installed on the top of the middle sleeve 3, and then the middle sleeve 3 is pressed on the pressed bushing 2 and against the panel of the substrate 1, and the explosion assembly is detonated through the detonation assembly. The shock wave and high-temperature gas generated by the explosion of the explosion assembly enter the inner cavity of the middle sleeve 3, and the pressure in the middle sleeve 3 is increased. These shock waves and pressure act on the impact ball 31 and are transmitted to the pressed bushing 2 through the impact ball 31, causing the pressed bushing 2 to deform, and then the hole 11 to be strengthened is strengthened. After the strengthening is completed, it is convenient to install and disassemble, and there is no need to use large-scale extrusion equipment and cutting, which saves time and effort and reduces costs. The present invention has a simple structure and is easy to use. It can perform cold extrusion on fasteners that are difficult to move and fasteners with high hardness, reduce the cost of the cold extrusion process, improve the versatility of the cold extrusion process, reduce the problems caused by stress concentration at the holes of aircraft fasteners, and extend the fatigue life of the aircraft.

[0036] Furthermore, in this embodiment, one or two impact balls 31 are selected according to actual needs.

[0037] In a further optimized solution, the press-fit bushing 2 includes an embedded tube 21 inserted into the hole 11 to be strengthened and tightly fitted with the hole 11 to be strengthened, the embedded tube 21 extends out of the hole 11 to be strengthened and is sleeved and fixed with a clamping plate 22, the outer edge of the clamping plate 22 is larger than the hole 11 to be strengthened, and the intermediate sleeve 3 is sleeved outside the clamping plate 22. The embedded tube 21 is adapted to the hole 11 to be strengthened, the top end of the embedded tube 21 extends out of the hole 11 to be strengthened and is fixed with the clamping plate 22, so that the press-fit bushing 2 can be mounted on the substrate 1; when in use, the intermediate sleeve 3 is covered on the press-fit bushing 2, and the impact generated by the explosion acts on the impact ball 31, and acts on the clamping plate 22 through the impact ball 31.

[0038] Further optimization scheme, the inner cavity of the middle sleeve 3 is provided with a guide block 32, the bottom end of the guide block 32 is in contact with the top end of the clamping plate 22, the top end of the guide block 32 is provided with a conical impact groove 33, the bottom end of the impact groove 33 is adapted to and connected with the inner cavity of the embedded tube 21, and the outlet at the bottom end of the impact groove 33 is smaller than the diameter of the impact ball 31. The impact groove 33 is in an inverted cone shape, which plays a guiding role, and the bottom end of its small diameter is aligned with the center of the embedded tube 21. When the impact ball 31 is impacted, the impact ball 31 moves in the impact groove 33 and finally acts on the clamping plate 22; the small diameter at the bottom end of the impact groove 33 is smaller than the diameter of the impact ball 31, which prevents the impact ball 31 from falling out when impacted, thereby improving safety.

[0039] Furthermore, a receiving groove 35 corresponding to the clamping plate 22 is provided at the bottom end of the guide block 32. When the intermediate sleeve 3 is positioned, the clamping plate 22 is embedded in the receiving groove 35. The height of the clamping plate 22 is the same as the depth of the receiving groove 35. After being fixed in place, the bottom end of the intermediate sleeve 3 contacts the surface of the substrate 1, and the top end of the clamping plate 22 contacts the top end of the receiving groove 35, so as to facilitate the transmission of the force of the impact ball 31.

[0040] Furthermore, sufficient lubrication is performed in the impact groove 33 to reduce the friction resistance during the impact process.

[0041] Further optimization scheme, the top of the intermediate sleeve 3 is provided with a threaded barrel 34, the bottom of the explosive barrel 4 is provided with a threaded groove 41 adapted to the threaded barrel 34, and the threaded barrel 34 is threadedly connected with the threaded groove 41. The intermediate sleeve 3 and the explosive barrel 4 are connected together by the threaded barrel 34 and the threaded groove 41, so that the two can form a whole, ensuring the sealing of the inner cavity of the intermediate sleeve 3, the product produced by the explosive assembly will not leak out, avoid pressure loss, and improve safety; at the same time, the explosive barrel 4 and the intermediate sleeve 3 are detachable, which is convenient for the reuse of the intermediate sleeve 3. After use, the explosive barrel 4 with a new explosive assembly can be replaced for reuse.

[0042] In a further optimized solution, the explosive assembly includes a mounting groove 42 provided at the top of the inner cavity of the explosive tube 4, an explosive 43 having an explosive effect is embedded and fixed in the mounting groove 42, a detonator 44 is provided at the top of the explosive 43, and the detonator 44 is provided corresponding to the detonator assembly. The bottom of the mounting groove 42 is open, and the explosive 43 is installed in the mounting groove 42, so that the shock wave generated by the explosion of the explosive 43 can be transmitted into the inner cavity of the intermediate sleeve 3 and act on the impact ball 31; the top of the explosive 43 is provided at the top of the detonator 44, and when working, the detonator 44 is activated to detonate the explosive 43.

[0043] Furthermore, the explosive 43 of this embodiment can be made of TNT explosives, which has high safety and can be molded into different shapes according to needs.

[0044] Furthermore, the detonator 44 of this embodiment is a primer used in conventional bullets. The principle of the primer detonating the explosive 43 can be referred to the principle of bullet firing, which will not be repeated here.

[0045] A further optimized solution is that the detonating assembly includes a detonating groove 45 opened at the top of the mounting groove 42, and a firing pin 46 is slidably arranged in the detonating groove 45, and the bottom end of the firing pin 46 hits the detonator 44 and detonates the detonator 44; a detonating spring 47 in a compressed state is arranged at the top of the detonating groove 45, and the detonating spring 47 is fixedly connected to the top of the firing pin 46, and the detonating spring 47 pushes the firing pin 46 to hit the detonator 44. The firing pin 46 is located in the detonating groove 45, and a top plate 48 is fixed to the top of the detonating groove 45. The top plate 48 slides in the detonating groove 45, so that the firing pin 46 can move longitudinally and ensure the stability of the firing pin 46. The detonating spring 47 is arranged between the top plate 48 and the top of the detonating groove 45; before use, the firing pin 46 is resisted, and the detonating spring 47 is in a compressed state. After starting, the clamping of the firing pin 46 is released, so that the detonating spring 47 loses its clamping, and the detonating spring 47 automatically resets and rebounds, pushing the firing pin 46 to move quickly toward the detonator 44, and the bottom end of the firing pin 46 hits the detonator 44, so that the detonator 44 is started, and then the explosive 43 is detonated.

[0046] A further optimized solution is that a locking groove 49 is provided on the side wall of the explosive tube 4, and a locking plate 410 is slidably connected in the locking groove 49. A middle hole 411 is provided on the locking plate 410, and the middle hole 411 is arranged corresponding to the detonating groove 45. When the middle hole 411 is aligned with the detonating groove 45, the firing pin 46 passes through the middle hole 411 and hits the detonator 44; a locking spring 412 is provided in the locking groove 49, and the locking spring 412 is fixedly connected to the end of the locking plate 410. When the middle hole 411 is aligned with the detonating groove 45, the locking spring 412 is in a compressed state. The locking plate 410 is inserted into the locking groove 49. When not in use, the locking spring 412 is in a free state, so that the end of the locking plate 410 extends out of the locking hole 413. At this time, the detonating groove 45 and the middle hole 411 are arranged in a staggered manner, and the bottom end of the firing pin 46 abuts against the guide groove 415 in the top end of the locking plate 410, which clamps and stabilizes the firing pin 46. At this time, the detonating spring 47 is in a compressed state, which plays a safety role, avoids accidental detonation, greatly improves safety, and accumulates potential energy for subsequent detonation. Provide power; when starting, the locking plate 410 is pressed into the locking groove 49, and the firing pin 46 slides in the guide groove 415 until the middle hole 411 is aligned with the detonating groove 45. The firing pin 46 is free after losing the support of the locking plate 410, and the detonating spring 47 is reset after losing the external force, and the accumulated potential energy is converted into the kinetic energy of the firing pin 46, so that the firing pin 46 passes through the middle hole 411 and quickly hits the detonator 44, detonating the detonator 44, and then detonating the explosive 43, thereby playing a detonating role.

[0047] Furthermore, the bottom end of the guide groove 415 is arranged in an arc surface, and the bottom end of the striker 46 is also a spherical head adapted to the guide groove 415 to reduce wear.

[0048] Further optimization scheme, a locking hole 413 is formed through the locking plate 410 on one side away from the locking spring 412, and a locking pin 414 is fitted in the locking hole 413. When the locking spring 412 is in a free state, the locking hole 413 is located outside the locking slot 49, and a locking pin 414 is provided in the locking slot 49. The length of the locking pin 414 is greater than the height of the locking slot 49, so that the locking plate 410 is stuck and cannot be pressed into the locking slot 49, which plays a safety role, avoids accidental contact and detonation during storage and transportation, and improves safety; when in use, the locking pin 414 is pulled out of the locking hole 413, and then the locking plate 410 is pressed toward the locking slot 49, so that the middle hole 411 and the detonation slot 45 are aligned. At this time, the locking plate 410 becomes a detonation switch, and can also become a protective structure of the device, which is easy to use and easy to install.

[0049] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An explosive impact ball extrusion integrated bushing, characterized in that: include: A press-fit bushing (2), wherein the press-fit bushing (2) is inserted into the hole (11) to be strengthened of the substrate (1); An intermediate sleeve (3), the intermediate sleeve (3) being sleeved on the press-fit bushing (2) and abutting against the base material (1); an inner cavity of the intermediate sleeve (3) is filled with a movable impact ball (31), and kinetic energy of the impact ball (31) is transmitted to the press-fit bushing (2) through impact; An explosion tube (4), the explosion tube (4) being detachably connected to the top end of the intermediate sleeve (3), an explosion assembly being arranged inside the explosion tube (4), the explosion impact generated by the explosion assembly being transmitted to the inner cavity of the intermediate sleeve (3) and acting on the impact ball (31); an initiation assembly being arranged inside the explosion tube (4), the initiation assembly being arranged corresponding to the explosion assembly and being used to control the initiation of the explosion assembly; The explosive assembly comprises a mounting groove (42) provided at the top end of the inner cavity of the explosive tube (4), an explosive (43) having an explosive effect is embedded and fixed in the mounting groove (42), a detonator (44) is disposed in contact with the top end of the explosive (43), and the detonator (44) is disposed corresponding to the detonator assembly; The detonating assembly comprises a detonating groove (45) opened at the top of the mounting groove (42), a firing pin (46) being slidably arranged in the detonating groove (45), and the bottom end of the firing pin (46) strikes the detonator (44) and detonates the detonator (44).

2. The ball-extruded integrated bushing for explosive impact according to claim 1, characterized in that: The press-fit bushing (2) comprises an embedded tube (21) inserted into the hole to be strengthened (11) and tightly fitted with the hole to be strengthened (11); the embedded tube (21) extends out of the hole to be strengthened (11) and is sleeved and fixedly connected with a clamping plate (22); the outer edge of the clamping plate (22) is larger than the hole to be strengthened (11); and the intermediate sleeve (3) is sleeved outside the clamping plate (22).

3. The ball-extruded integrated bushing for explosive impact according to claim 2, characterized in that: The inner cavity of the intermediate sleeve (3) is provided with a guide block (32), the bottom end of the guide block (32) abuts against the top end of the clamping plate (22), the top end of the guide block (32) is provided with a conical impact groove (33), the bottom end of the impact groove (33) is adapted to and communicates with the inner cavity of the embedded tube (21), and the outlet at the bottom end of the impact groove (33) is smaller than the diameter of the impact ball (31).

4. The ball-extruded one-piece bushing for explosive impact according to claim 1, characterized in that: The top end of the intermediate sleeve (3) is provided with a threaded barrel (34), the bottom end of the explosive barrel (4) is provided with a threaded groove (41) matched with the threaded barrel (34), and the threaded barrel (34) is threadably connected to the threaded groove (41).

5. The ball-extruded one-piece bushing for explosive impact according to claim 1, characterized in that: A detonating spring (47) in a compressed state is disposed at the top end of the detonating groove (45); the detonating spring (47) is fixedly connected to the top end of the firing pin (46); the detonating spring (47) pushes the firing pin (46) to strike the detonator (44).

6. The ball-extruded one-piece bushing for explosive impact according to claim 1, characterized in that: The side wall of the explosive tube (4) is provided with a locking groove (49), a locking plate (410) is slidably connected in the locking groove (49), a middle hole (411) is provided on the locking plate (410), and the middle hole (411) is arranged corresponding to the detonation groove (45). When the middle hole (411) is aligned with the detonation groove (45), the firing pin (46) passes through the middle hole (411) and strikes the detonator (44).

7. The ball-extruded one-piece bushing for explosive impact according to claim 6, characterized in that: A locking spring (412) is disposed in the locking groove (49), and the locking spring (412) is fixedly connected to the end of the locking plate (410). When the middle hole (411) is aligned with the detonation groove (45), the locking spring (412) is in a compressed state.

8. The ball-extruded one-piece bushing for explosive impact according to claim 7, characterized in that: A locking hole (413) is formed through a side of the locking plate (410) away from the locking spring (412), and a locking pin (414) is adapted to be disposed in the locking hole (413).

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