Slotted lining cold extrusion fastening hole strengthening device and method

Abstract

The invention belongs to the technical field of slotted bushing cold strengthening, and provides a slotted bushing cold extrusion fastening hole strengthening device and method.The slotted bushing cold extrusion fastening hole strengthening device comprises a fixing frame mechanism which comprises a rotary disc and a plurality of adsorption leg assemblies; the core rod pushing-in assembly comprises a push-pull cold extrusion gun, the push-pull cold extrusion gun is arranged on the side, close to the fastening hole plate, of the rotary table through a distance adjusting piece, and the distance adjusting piece is mainly used for adjusting the distance between the push-pull cold extrusion gun and the fastening hole; the distance measuring assembly is arranged on the rotating disc and used for measuring the distance between an obstacle behind the fastening hole and the rotating disc; and the leveling assembly comprises an auxiliary plate and a plurality of length adjusting pieces arranged on the multiple adsorption leg assemblies correspondingly, the auxiliary plate is used for being attached to the fastening hole plate, the multiple length adjusting pieces are used for adjusting the rotating disc and the auxiliary plate to be in a parallel state, and a leveling indicating piece is arranged between the auxiliary plate and the rotating disc. According to the invention, a compact structure can be processed, and a closed hole end can be subjected to slotted lining cold pressurization strengthening.

Description

Technical Field

[0001] The invention belongs to the technical field of cold strengthening of slotted bushings, and in particular relates to a device and method for strengthening cold extruded fastening holes of slotted bushings. Background Art

[0002] Since most aircraft connections are mechanical, it is necessary to make holes in the aircraft structure. However, this mechanical connection and damage repair process often leads to fatigue problems in the structure. Studies have shown that in 70% of flight fatigue accidents, the origin of fatigue cracks can be traced back to the connection parts, and the stress concentration at the edge of the hole is extremely unfavorable for the fatigue life. Therefore, it is of great practical significance to fatigue strengthen the holes in the structure to extend the service life of the aircraft. Among the many methods of structural hole fatigue gain technology, cold extrusion technology has attracted much attention due to its unique advantages. This technology forms an extrusion layer near the hole and introduces compressive residual stress by pulling a round bar with a diameter larger than the hole diameter through the structural hole, thereby significantly improving the fatigue life of the material near the hole. Compared with other technologies, the fatigue gain effect obtained by cold extrusion technology is the most significant. Among them, the cold extrusion method using a slit bushing can significantly reduce the damage to the hole wall and ensure that the hole maintains the correct radial expansion, further improving the durability and safety of the connection structure.

[0003] Traditional cold extrusion technology usually requires the installation of a mandrel on the other side of the fastening hole to complete the cold extrusion process by drawing. However, since some fastening holes in the aircraft structure are in a confined space and cannot be passed from the reverse side; and because the aircraft structure is compact, there is not enough depth behind the fastening hole to accommodate a longer mandrel. For example, this may happen at the structural connection on the wing of an aircraft. Since the inside of the wing needs to maintain a certain airtightness, and the surface of the wing is often painted and sealed, the fastening holes on the wing may be covered by the structure or seals and cannot be passed from the other side, and there is not enough length behind the fastening hole to accommodate a longer mandrel. This requires a process that can complete cold extrusion in one direction, so as to complete the installation and fatigue strengthening of the connector without damaging the aircraft structure and sealing. Summary of the invention

[0004] The object of the present invention is to provide a device and method for strengthening the cold extrusion fastening holes of a slotted bushing to solve the above-mentioned problems, so as to achieve the purpose of processing a compact structure and cold pressurizing and strengthening the closed hole end of the slotted bushing.

[0005] To achieve the above object, the present invention provides the following solution: a slotted bushing cold extrusion fastening hole strengthening device, comprising:

[0006] The fixing frame mechanism comprises a rotating disk and a plurality of adsorption leg assemblies, wherein the rotating disk is fixedly connected to the outside of the fastening hole plate through the plurality of adsorption leg assemblies;

[0007] A mandrel pushing assembly includes a push-pull cold extrusion gun, which is arranged on one side of the turntable close to the fastening hole plate through a distance adjusting member, and is used to push the mandrel into the fastening hole. The main function of the distance adjusting member is to adjust the distance between the push-pull cold extrusion gun and the fastening hole, thereby controlling the length of the mandrel penetrating the fastening hole;

[0008] A distance measuring assembly, the distance measuring assembly is arranged on the turntable, and the distance measuring assembly is used to measure the distance between the obstacle behind the fastening hole and the turntable before the mandrel is pushed in;

[0009] A leveling assembly, the leveling assembly includes an auxiliary plate and a plurality of length adjustment members respectively arranged on the plurality of adsorption leg assemblies, the auxiliary plate is used to fit with the fastening hole plate, the plurality of length adjustment members are used to adjust the turntable and the auxiliary plate to a parallel state, and a leveling indicator is arranged between the auxiliary plate and the turntable.

[0010] Preferably, the distance adjusting member includes a column fixedly connected to a side of the turntable close to the fastening hole plate, the column is arranged at the edge of the turntable, a slide groove is opened on the column, the slide groove is arranged perpendicular to the turntable, a slider is slidably connected in the slide groove, the push-pull cold extrusion gun is fixedly connected to the slider, a second hydraulic rod is fixedly connected in the column, and the telescopic end of the second hydraulic rod is fixedly connected to the slider.

[0011] Preferably, a cold extrusion gun position fixing device is also provided, and the cold extrusion gun position fixing device includes a fixing rod, one end of the fixing rod is fixedly connected to a side of the push-pull cold extrusion gun close to the turntable, and the other end of the fixing rod passes through the turntable, and a fixed clamping block and a fixed seat are fixedly connected to the side of the turntable away from the column, and a movable clamping block is slidably connected to the fixed seat in a direction parallel to the plane where the turntable is located, the fixing rod is located between the fixed clamping block and the movable clamping block, and a pushing member is provided between the movable clamping block and the fixed seat.

[0012] Preferably, the fixing frame mechanism further comprises a bracket, and the turntable is rotatably connected to the middle part of the bracket;

[0013] The suction leg assembly includes a suction cup and a support leg fixedly connected to the edge of the bracket, the length adjustment member is arranged at one end of the support leg away from the bracket, and the suction cup is arranged on the length adjustment member.

[0014] Preferably, the length adjustment member includes a rotating rod rotatably connected to the end of the support leg away from the bracket, the end of the rotating rod away from the support leg is provided with a threaded hole inwardly, a threaded rod is adapted in the threaded hole, and the suction cup is fixedly connected to the end of the threaded rod away from the rotating rod.

[0015] Preferably, the leveling indicator includes a first hydraulic rod fixedly connected to a side of the turntable close to the fastening hole plate, the first hydraulic rod is coaxially arranged with the turntable, and the first hydraulic rod is perpendicular to the turntable, the telescopic end of the first hydraulic rod is fixedly connected with a connecting ball, a ball seat is arranged on the auxiliary plate, the connecting ball is hinged in the ball seat, and two groups of angle plates are also fixedly connected to the auxiliary plate, the two groups of angle plates are vertically arranged, and the two groups of angle plates are respectively perpendicular to the auxiliary plates, and when the projections of the first hydraulic rod on the two groups of angle plates coincide with the vertical lines of the two groups of angle plates, the auxiliary plates are parallel to the turntable.

[0016] Preferably, a working hole is provided on the auxiliary plate, the working hole corresponds to the fastening hole, and a nose cap is detachably connected to the working hole.

[0017] Preferably, the push-pull cold extrusion gun includes a piston slidably connected inside and a first through hole and a second through hole opened on the side wall of the push-pull cold extrusion gun, the first through hole and the second through hole are respectively located on both sides of the piston, the first through hole and the second through hole are connected to an external hydraulic pump station, one end of the piston is fixedly connected to one end of a piston rod, the end of the push-pull cold extrusion gun away from the turntable is fixedly connected to a gun head, a connecting head is slidably connected inside the gun head, the other end of the piston rod is fixedly connected to the connecting head, and the end of the connecting head away from the piston rod is detachably connected to the core rod.

[0018] A method for strengthening a slotted bushing cold extrusion fastening hole, the operation steps comprising:

[0019] The mandrel is mounted on the push-pull cold extrusion gun, and the turntable is fixed on the fastening hole plate through a number of suction leg assemblies;

[0020] The auxiliary plate is pressed and fastened to the hole plate, and several length adjusting parts are adjusted until the leveling indicator shows that the auxiliary plate and the turntable are in parallel state;

[0021] Insert the slotted bushing into the fastening hole, measure the distance between the turntable and the obstacle behind the hole through the distance measuring component, and adjust the distance between the push-pull cold extrusion gun head and the fastening hole plate according to the measured value;

[0022] Control the push-pull cold extrusion gun to push the core rod toward the fastening hole and pass it through the slit bushing;

[0023] Pull out the slit bushing from the fastening hole, then control the push-pull cold extrusion gun to work and pull out the core rod from the fastening hole.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] 1. The present invention realizes mandrel push-in loading by arranging a fixing frame mechanism that can be adsorbed on the plate, so that the closed fastening hole can be cold extruded and strengthened without disassembly and assembly. The loading operation can be completed on one side of the hole, which provides convenience for cold extrusion.

[0026] 2. The present invention can accurately adjust the insertion length of the core rod through the distance adjustment member and the distance measuring component, and can be applied to the cold extrusion strengthening of holes of different depths. It can load the hole walls of different depths without causing impact damage to the machine body, thus providing versatility for cold extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic diagram of the strengthening device of the present invention;

[0029] Figure 2 for Figure 1 A partial enlarged view in FIG.

[0030] Figure 3 It is a schematic diagram of the mandrel pushing assembly of the present invention;

[0031] Figure 4 A cross-sectional view of a mandrel pushing assembly of the present invention;

[0032] Figure 5 is a cross-sectional view of the length adjusting member of the present invention;

[0033] Figure 6 It is a cross-sectional view of the push-pull cold extrusion gun of the present invention;

[0034] Figure 7 It is a schematic diagram of the installation of the nose cap and the auxiliary plate of the present invention;

[0035] Among them, 1. bracket; 2. turntable; 3. auxiliary plate; 4. supporting leg; 5. rotating rod; 6. threaded rod; 7. suction cup; 8. first hydraulic rod; 9. ball seat; 10. angle plate; 11. nose cap; 12. fixing rod; 13. push-pull cold extrusion gun; 14. column; 15. connecting ball; 16. laser rangefinder; 17. outer cylinder; 18. telescopic rod; 19. second hydraulic rod; 20. slider; 21. slide groove; 22. threaded hole; 23. connecting seat; 24. fixing clamp; 25. fixing seat; 26. movable clamp; 27. fastening bolt; 28. piston; 29. ​​piston rod; 30. oil seal; 31. gun head; 32. connecting head; 33. core rod; 34. working hole; 35. first through hole; 36. second through hole. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] Reference Figure 1-Figure 7 The present invention provides a slotted bushing cold extrusion fastening hole strengthening device, comprising:

[0039] The fixing frame mechanism comprises a turntable 2 and a plurality of adsorption leg assemblies, wherein the turntable 2 is fixedly connected to the outside of the fastening hole plate through the plurality of adsorption leg assemblies;

[0040] The mandrel pushing assembly includes a push-pull cold extrusion gun 13, which is arranged on one side of the turntable 2 close to the fastening hole plate through a distance adjusting member. The push-pull cold extrusion gun 13 is used to push the mandrel 33 into the fastening hole. The main function of the distance adjusting member is to adjust the distance between the push-pull cold extrusion gun 13 and the fastening hole, thereby controlling the length of the mandrel 33 penetrating the fastening hole;

[0041] A distance measuring component, which is arranged on the turntable 2 and is used to measure the distance between the obstacle behind the fastening hole and the turntable 2 before the mandrel 33 is pushed in;

[0042] The leveling component includes an auxiliary plate 3 and a number of length adjustment members respectively arranged on a number of adsorption leg assemblies. The auxiliary plate 3 is used to fit with the fastening hole plate. The number of length adjustment members are used to adjust the turntable 2 and the auxiliary plate 3 to a parallel state. A leveling indicator is arranged between the auxiliary plate 3 and the turntable 2.

[0043] The main function of the turntable 2 is to drive the distance measuring component and the push-pull cold extrusion gun 13 to move relative to the fastening hole to avoid interference between the distance measuring work and the hole strengthening work; the main function of the adsorption leg component is to fix the fixing frame mechanism on one side wall of the fastening hole plate; the main function of the push-pull cold extrusion gun 13 is to push the core rod into the fastening hole or pull it out from the fastening hole; the main function of the distance adjusting member is to adjust the distance between the push-pull cold extrusion gun 13 and the fastening hole according to different hole depths and obstacles behind the hole; the main function of the distance measuring component is to measure the distance between the turntable 2 and the obstacle behind the fastening hole, providing a basis for the movement of the distance adjusting member; the main function of the auxiliary plate 3 is to assist in adjusting the turntable 2 and the plate to be in a parallel state, thereby ensuring that the core rod 33 and the fastening hole are in a vertical state; the main function of the length adjusting member is to adjust the angle between the turntable 2 and the auxiliary plate 3; the main function of the leveling indicator is to display when the turntable 2 and the auxiliary plate 3 are in a parallel state. On the whole, the present invention realizes push-in loading of the mandrel by providing a fixing frame mechanism that can be adsorbed on the plate, so that the closed fastening hole can be cold-extruded and strengthened without disassembly and assembly, and the loading operation can be completed on one side of the hole. At the same time, the extension length of the mandrel can be accurately adjusted through the distance adjustment member and the distance measuring component, which can be suitable for cold extrusion strengthening of holes of different depths, and can realize loading of hole walls of different depths without causing impact damage to the machine body.

[0044] A further optimized solution also includes a control unit, which is electrically connected to the distance adjustment component and the distance measuring component.

[0045] A further optimized solution is that the distance adjusting member includes a column 14 fixedly connected to the side of the turntable 2 close to the fastening hole plate, the column 14 is arranged at the edge of the turntable 2, a slide groove 21 is opened on the column 14, the slide groove 21 is arranged vertically to the turntable 2, a slider 20 is slidably connected in the slide groove 21, the push-pull cold extrusion gun 13 is fixedly connected to the slider 20, and a second hydraulic rod 19 is fixedly connected in the column 14, and the telescopic end of the second hydraulic rod 19 is fixedly connected to the slider 20.

[0046] like Figure 4 As shown, the second hydraulic rod 19 is connected to the external hydraulic pump station. According to the value measured by the distance measuring component, the operator can control the second hydraulic rod 19 to extend and retract its telescopic end through the control unit, thereby driving the slider 20 to slide in the slide groove 21, and then the push-pull cold extrusion gun 13 moves along the column 14, thereby achieving the purpose of adjusting the distance between the gun head and the fastening hole.

[0047] A further optimized solution is provided with a cold extrusion gun position fixing device, which includes a fixing rod 12, one end of which is fixedly connected to a side of the push-pull cold extrusion gun 13 close to the turntable 2, and the other end of the fixing rod 12 passes through the turntable 2, and a fixed clamping block 24 and a fixed seat 25 are fixedly connected to the side of the turntable 2 away from the column 14, and a movable clamping block 26 is slidably connected to the fixed seat 25 in a direction parallel to the plane where the turntable 2 is located, and the fixing rod 12 is located between the fixed clamping block 24 and the movable clamping block 26, and a pushing member is provided between the movable clamping block 26 and the fixed seat 25.

[0048] In a further optimized solution, the pusher includes a fastening bolt 27 threadedly connected to the fixing seat 25 , and a threaded end of the fastening bolt 27 abuts against a side of the movable clamping block 26 away from the fixing rod 12 .

[0049] like Figure 2 and Figure 4 As shown, after the position of the push-pull cold extrusion gun 13 is fixed, in order to prevent the position of the push-pull cold extrusion gun 13 from moving during the process of pushing the core rod 33, the operator can use a tool to rotate the fastening bolt 27 to move the fastening bolt 27 toward the square of the movable clamping block 26, move the movable clamping block 26, and finally achieve the effect of clamping the fixed rod 12 between the movable clamping block 26 and the fixed clamping block 24, and fix the position of the push-pull cold extrusion gun 13 by limiting the movement of the fixed rod 12.

[0050] To further optimize the solution, the end of the push-pull cold extrusion gun 13 away from the plate is fixedly connected to one end of the telescopic rod 18, the telescopic rod 18 is arranged parallel to the slide groove 21, and the end of the telescopic rod 18 away from the push-pull cold extrusion gun 13 is slidably sleeved with an outer cylinder 17, and the outer cylinder 17 is fixedly connected to the turntable 2.

[0051] like Figure 3 and Figure 4 As shown, by providing the telescopic rod 18 and the outer cylinder 17, the movement of the push-pull cold extrusion gun 13 can be made more stable.

[0052] According to a further optimized solution, the fixed frame mechanism further comprises a bracket 1, and a turntable 2 is rotatably connected to the middle part of the bracket 1;

[0053] The suction leg assembly includes a suction cup 7 and a support leg 4 fixedly connected to the edge of the bracket 1, a length adjustment member is arranged at one end of the support leg 4 away from the bracket 1, and the suction cup 7 is arranged on the length adjustment member.

[0054] like Figure 1 As shown, the bracket 1 is adsorbed on the plate through the suction cup 7, so that the entire strengthening device is fixed on the side wall of the plate. The suction cup 7 is connected to the external negative pressure generating device. After the suction cup 7 is attached to the plate, the suction cup 7 is adsorbed on the plate by creating negative pressure between the suction cup 7 and the plate.

[0055] A further optimized solution is that the length adjustment member includes a rotating rod 5 rotatably connected to the end of the support leg 4 away from the bracket 1, and a threaded hole 22 is opened inward at the end of the rotating rod 5 away from the support leg 4, and a threaded rod 6 is adapted in the threaded hole 22, and a suction cup 7 is fixedly connected to the end of the threaded rod 6 away from the rotating rod 5.

[0056] like Figure 5 As shown, one end of the rotating rod 5 close to the supporting leg 4 is fixedly connected to the connecting seat 23, and the rotating rod 5 is rotatably connected to the supporting leg 4 through the connecting seat 23. After the bracket 1 is adsorbed on the plate through the suction cup 7, when the length of a certain supporting leg 4 needs to be adjusted, the operator can twist the rotating rod 5. Since the suction cup 7 cannot rotate, there is relative rotation between the rotating rod 5 and the threaded rod 6, so that the length of the threaded rod 6 extending out of the rotating rod 5 can be adjusted, thereby achieving length adjustment.

[0057] According to a further optimized solution, the distance measuring component includes a laser distance meter 16 fixedly connected to the turntable 2 , and the laser distance meter 16 is arranged close to the push-pull cold extrusion gun 13 .

[0058] A further optimized solution is provided, in which the leveling indicator includes a first hydraulic rod 8 fixedly connected to the side of the turntable 2 close to the fastening hole plate. The first hydraulic rod 8 is coaxially arranged with the turntable 2 and is perpendicular to the turntable 2. The telescopic end of the first hydraulic rod 8 is fixedly connected with a connecting ball 15. A ball seat 9 is arranged on the auxiliary plate 3. The connecting ball 15 is hinged in the ball seat 9. Two groups of angle plates 10 are also fixedly connected to the auxiliary plate 3. The two groups of angle plates 10 are vertically arranged and the two groups of angle plates 10 are respectively vertically arranged with the auxiliary plate 3. When the projections of the first hydraulic rod 8 on the two groups of angle plates 10 coincide with the vertical lines of the two groups of angle plates 10, the auxiliary plate 3 is parallel to the turntable 2.

[0059] According to a further optimized solution, the angle plate 10 is made of a transparent material and has angle scales marked thereon.

[0060] like Figure 1 and Figure 3 As shown, after the auxiliary plate 3 is fitted with the plate by controlling the first hydraulic rod 8 to extend through the control unit, the operator adjusts the distance between the bracket 1 and the plate in each direction by rotating a plurality of rotating rods 5, thereby achieving the purpose of adjusting the angle between the turntable 2 and the auxiliary plate 3. During the adjustment process, the connecting ball 15 will rotate in the ball seat 9. When the turntable 2 and the auxiliary plate 3 are adjusted to a parallel state, the projection of the first hydraulic rod 8 on the two angle plates 10 coincides with the 90-degree scale line on the angle plate 10. At this time, the adjustment can be stopped, and it can be ensured that the push-pull cold extrusion gun 13, the laser rangefinder 16 and the fastening hole are in a vertical state.

[0061] According to a further optimized solution, a working hole 34 is provided on the auxiliary plate 3 , the working hole 34 corresponds to the fastening hole, and a nose cap 11 is detachably connected to the working hole 34 .

[0062] like Figure 1 and Figure 7 As shown, the working hole 34 is connected to the nose cap 11 by a threaded connection. Before the strengthening begins, the operator can put the slotted bushing into the fastening hole through the working hole 34, and then, by screwing the nose cap 11, the slotted bushing can be compressed.

[0063] A further optimized solution is that the push-pull cold extrusion gun 13 includes a piston 28 slidably connected inside and a first through hole 35 and a second through hole 36 opened on the side wall of the push-pull cold extrusion gun 13. The first through hole 35 and the second through hole 36 are respectively located on both sides of the piston 28. The first through hole 35 and the second through hole 36 are connected to an external hydraulic pump station. One end of the piston 28 is fixedly connected to one end of a piston rod 29, and the end of the push-pull cold extrusion gun 13 away from the turntable 2 is fixedly connected to a gun head 31, and a connecting head 32 is slidably connected inside the gun head 31. The other end of the piston rod 29 is fixedly connected to the connecting head 32, and the end of the connecting head 32 away from the piston rod 29 is detachably connected to the core rod 33.

[0064] According to a further optimized solution, an oil seal 30 is provided between the piston rod 29 and the end of the push-pull cold extrusion gun 13 .

[0065] like Figure 6 As shown, the first through hole 35 and the second through hole 36 are connected to the hydraulic pump station through the electromagnetic reversing valve. After the core rod 33 is connected to the connector 32, the reversing valve controls the flow direction of the hydraulic oil, so that the piston 28 can move toward the direction of the gun head 31, and the core rod 33 can be pushed into the fastening hole by pushing the piston rod 29. After the strengthening is completed, the reversing valve is controlled to change the flow direction of the hydraulic oil, and the piston 28 is controlled to move in the opposite direction, so as to achieve the effect of pulling out the core rod 33.

[0066] A method for strengthening a slotted bushing cold extrusion fastening hole, the operation steps comprising:

[0067] The mandrel 33 is mounted on the push-pull cold extrusion gun 13, and the turntable 2 is fixed on the fastening hole plate through a plurality of suction leg assemblies;

[0068] First, connect the core rod to the connecting head 32, then fit the auxiliary plate 3, several suction cups 7 and the fastening hole plate, and ensure that the fastening hole to be strengthened is in the working hole 34, and use the negative pressure generating device to make the suction cup 7 adsorb on the plate to achieve the fixation of the bracket 1.

[0069] The auxiliary plate 3 is pressed and fastened to the hole plate, and several length adjusting parts are adjusted until the leveling indicator shows that the auxiliary plate 3 and the turntable 2 are in a parallel state;

[0070] The control unit controls the extension of the first hydraulic rod 8 to press the auxiliary plate 3 tightly against the plate. Then, the rotating rods 5 are rotated to adjust the angle between the turntable 2 and the auxiliary plate 3. When the operator observes from the two angle plates 10 that the first hydraulic rod 8 coincides with the vertical scale lines on the angle plates 10, it indicates that the turntable 2 is parallel to the auxiliary plate 3. At this time, the push-pull cold extrusion gun 13 is perpendicular to the hole to be extruded.

[0071] Insert the slotted bushing into the fastening hole, measure the distance between the turntable 2 and the obstacle behind the hole by the distance measuring component, adjust the distance between the push-pull cold extrusion gun 13 and the fastening hole plate according to the measured value, and calculate the subsequent push-in distance of the mandrel 33 at the same time;

[0072] After the slit bushing is installed into the fastening hole through the working hole 34, the nose cap 11 can be screwed into the working hole 34, the core rod 33 can be pushed into the fastening hole through the nose cap 11, and the nose cap 11 can also press the slit bushing into the fastening hole.

[0073] Rotate the turntable 2 to make the laser rangefinder 16 correspond to the fastening hole. At this time, the control unit controls the laser rangefinder 16 to measure the distance between the obstacles or parts such as the machine body behind the fastening hole and the turntable 2, so that it can be inferred that the second hydraulic rod 19 controls the push-pull cold extrusion gun 13 to move to the position to ensure that the core rod 33 will not contact the object behind the hole when it is pushed.

[0074] Control the push-pull cold extrusion gun 13 to work, push the mandrel 33 toward the fastening hole and pass through the slit bushing;

[0075] By controlling the reversing valve, the push-pull cold extrusion gun 13 pushes the core rod 33 toward the fastening hole and through the slit bushing, and the push-pull cold extrusion gun 13 is kept working until the head of the core rod 33 completely passes through the fastening hole. The slit bushing is squeezed by the head of the core rod 33 to expand and squeeze the fastening hole, thereby strengthening the fastening hole.

[0076] The slit bushing is pulled out from the fastening hole, and then the push-pull cold extrusion gun 13 is controlled to work to pull the core rod 33 out of the fastening hole.

[0077] During the strengthening process, before pushing out the core rod 33, first unscrew the nose cap 11 and pull out the slit bushing from the fastening hole, then control the reversing valve to move the piston 28 in the reverse direction to withdraw the core rod 33 to prevent the core rod 33 from squeezing the hole end for the second time.

[0078] After the above work is completed, it is necessary to verify whether the appropriate amount of cold extrusion has been completed. Insert a gauge into the cold extrusion hole to check whether the cold extrusion is successful.

[0079] At the same time, after cold extrusion, the hole needs to be reamed to remove the ridges and tiny cracks around the hole and to achieve the specified diameter of the fastener fit.

[0080] 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.

[0081] 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. A slotted bushing cold extrusion fastening hole strengthening device, characterized in that ,include: The fixing frame mechanism comprises a rotating disk (2) and a plurality of adsorption leg assemblies, wherein the rotating disk (2) is fixedly connected to the outer side of the fastening hole plate through the plurality of adsorption leg assemblies; A mandrel pushing assembly comprises a push-pull cold extrusion gun (13), wherein the push-pull cold extrusion gun (13) is arranged on a side of the turntable (2) close to the fastening hole plate through a distance adjusting member, and the push-pull cold extrusion gun (13) is used to push the mandrel (33) into the fastening hole, and the main function of the distance adjusting member is to adjust the distance between the push-pull cold extrusion gun (13) and the fastening hole, thereby controlling the length of the mandrel (33) penetrating the fastening hole; a distance measuring component, the distance measuring component being arranged on the rotating disk (2), and being used for measuring the distance between an obstacle behind the fastening hole and the rotating disk (2) before the mandrel (33) is pushed in; A leveling component, the leveling component comprising an auxiliary plate (3) and a plurality of length adjustment members respectively arranged on a plurality of the adsorption leg assemblies, the auxiliary plate (3) being used to fit with the fastening hole plate, the plurality of the length adjustment members being used to adjust the turntable (2) and the auxiliary plate (3) to a parallel state, and a leveling indicator being arranged between the auxiliary plate (3) and the turntable (2).

2. A slotted bushing cold extrusion fastening hole strengthening device according to claim 1, characterized in that: The distance adjustment member comprises a column (14) fixedly connected to the turntable (2) on one side close to the fastening hole plate, the column (14) being arranged at the edge of the turntable (2), a slide groove (21) being provided on the column (14), the slide groove (21) being arranged vertically to the turntable (2), a slider (20) being slidably connected in the slide groove (21), the push-pull cold extrusion gun (13) being fixedly connected to the slider (20), a second hydraulic rod (19) being fixedly connected in the column (14), and a telescopic end of the second hydraulic rod (19) being fixedly connected to the slider (20).

3. A slotted bushing cold extrusion fastening hole strengthening device according to claim 2, characterized in that: A cold extrusion gun position fixing member is also provided, the cold extrusion gun position fixing member comprises a fixing rod (12), one end of the fixing rod (12) is fixedly connected to a side of the push-pull cold extrusion gun (13) close to the turntable (2), the other end of the fixing rod (12) passes through the turntable (2), a fixing clamp (24) and a fixing seat (25) are fixedly connected to a side of the turntable (2) away from the column (14), a movable clamp (26) is slidably connected to the fixed seat (25) in a direction parallel to the plane where the turntable (2) is located, the fixing rod (12) is located between the fixing clamp (24) and the movable clamp (26), and a pushing member is provided between the movable clamp (26) and the fixing seat (25).

4. A slotted bushing cold extrusion fastening hole strengthening device according to claim 1, characterized in that: The fixing frame mechanism further comprises a bracket (1), and the rotating disk (2) is rotatably connected to the middle part of the bracket (1); The suction leg assembly comprises a suction cup (7) and a support leg (4) fixedly connected to the edge of the bracket (1); the length adjustment member is arranged at an end of the support leg (4) away from the bracket (1); and the suction cup (7) is arranged on the length adjustment member.

5. A slotted bushing cold extrusion fastening hole strengthening device according to claim 4, characterized in that: The length adjustment member comprises a rotating rod (5) rotatably connected to the end of the support leg (4) away from the bracket (1); the end of the rotating rod (5) away from the support leg (4) is provided with a threaded hole (22) inwardly, a threaded rod (6) is adapted in the threaded hole (22), and the suction cup (7) is fixedly connected to the end of the threaded rod (6) away from the rotating rod (5).

6. The cold extrusion fastening hole strengthening device for a slotted bushing according to claim 1 is characterized in that: The leveling indicator comprises a first hydraulic rod (8) fixedly connected to the turntable (2) on one side close to the fastening hole plate, the first hydraulic rod (8) being coaxially arranged with the turntable (2), and the first hydraulic rod (8) being perpendicular to the turntable (2), the telescopic end of the first hydraulic rod (8) being fixedly connected with a connecting ball (15), the auxiliary plate (3) being provided with a ball seat (9), the connecting ball (15) being hinged in the ball seat (9), the auxiliary plate (3) being further fixedly connected with two groups of angle plates (10), the two groups of angle plates (10) being vertically arranged, and the two groups of angle plates (10) being respectively vertically arranged with the auxiliary plate (3), and when the projections of the first hydraulic rod (8) on the two groups of angle plates (10) respectively coincide with the vertical lines of the two groups of angle plates (10), the auxiliary plate (3) is parallel to the turntable (2).

7. The cold extrusion fastening hole strengthening device for a slotted bushing according to claim 1 is characterized in that: The auxiliary plate (3) is provided with a working hole (34), the working hole (34) corresponds to the fastening hole, and a nose cap (11) is detachably connected to the working hole (34).

8. The cold extrusion fastening hole strengthening device for a slotted bushing according to claim 1 is characterized in that: The push-pull cold extrusion gun (13) comprises a piston (28) slidably connected inside and a first through hole (35) and a second through hole (36) opened on the side wall of the push-pull cold extrusion gun (13), wherein the first through hole (35) and the second through hole (36) are respectively located on both sides of the piston (28), and the first through hole (35) and the second through hole (36) are connected to an external hydraulic pump station, one end of the piston (28) is fixedly connected to one end of a piston rod (29), and the end of the push-pull cold extrusion gun (13) away from the turntable (2) is fixedly connected to a gun head (31), and a connecting head (32) is slidably connected inside the gun head (31), the other end of the piston rod (29) is fixedly connected to the connecting head (32), and the end of the connecting head (32) away from the piston rod (29) is detachably connected to the core rod (33).

9. A method for strengthening the fastening hole of a slotted bushing by cold extrusion, based on the device for strengthening the fastening hole of a slotted bushing by cold extrusion according to claim 1, characterized in that: The steps include: The mandrel (33) is mounted on the push-pull cold extrusion gun (13), and the turntable (2) is fixed on the fastening hole plate through a plurality of suction leg assemblies; The auxiliary plate (3) is pressed against the fastening hole plate, and a plurality of length adjustment members are adjusted until the leveling indicator member shows that the auxiliary plate (3) and the turntable (2) are in a parallel state; Insert the slotted bushing into the fastening hole, measure the distance between the turntable (2) and the obstacle behind the hole by using the distance measuring component, and adjust the distance between the push-pull cold extrusion gun (13) and the fastening hole plate according to the measured value; Controlling the push-pull cold extrusion gun (13) to work, pushing the mandrel (33) toward the fastening hole and passing through the slit bushing; The slotted bushing is pulled out from the fastening hole, and then the push-pull cold extrusion gun (13) is controlled to work, and the core rod (33) is pulled out from the fastening hole.

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