Cold extrusion strengthening device

Abstract

The utility model discloses a cold extrusion strengthening device which comprises a nose top cap with one end being a hollow area and the other end being provided with a first through hole; one end of the core rod penetrates through the first through hole, and the other end is arranged in the nose top cap; one end of the core rod base enables the core rod to be inserted and forms threaded connection, the other end of the core rod base is of a hollow sleeve structure, a pull gun piston rod is arranged in the hollow sleeve structure, and the pull gun piston rod is in threaded connection with the core rod base; the guide sleeve is arranged in the nose top cap, the core rod penetrates through the guide sleeve, and the end, away from the nose top cap, of the guide sleeve is in threaded connection with the core rod base; the pull gun shell is in threaded connection with the inner side of the open end of the hollow area of the nose top cap, one end of the multi-seam lining is arranged in the guide sleeve, the other end of the multi-seam lining extends to the outer side of the first through hole, the core rod is inserted into the multi-seam lining, one end of the spring is connected with the multi-seam lining, the other end of the spring is connected with the core rod base, and the core rod penetrates through the spring. The utility model provides a cold extrusion operation device for single-side operation.

Description

Technical Field

[0001] The present application relates to a cold extrusion strengthening device, belonging to the technical field of cold extrusion. Background Art

[0002] There are a large number of structural holes on the aircraft cover, main door sill, main beam and other load-bearing structures, such as fastener holes and load-bearing intersection holes. The holes on the load-bearing structure need to use cold extrusion technology to improve the fatigue life of the structure, thereby improving the overall life of the aircraft. Especially when strengthening closed structural holes, part structures do not allow or require single-person operation, a single-sided cold extrusion strengthening device is required. Therefore, a new cold extrusion strengthening device has become a problem that technicians in this field urgently need to solve. Utility Model Content

[0003] According to one aspect of the present application, a cold extrusion strengthening device is provided, which realizes single-sided cold extrusion strengthening operation.

[0004] A cold extrusion strengthening device, comprising:

[0005] A nose cap, one end of which is a hollow area and the other end of which is provided with a first through hole;

[0006] A mandrel, one end of which passes through the first through hole and the other end of which is disposed inside the nose cap;

[0007] A mandrel base, one end of which is threadedly connected to the mandrel, and the other end of which is a hollow sleeve structure in which a gun pulling piston rod is arranged, and the gun pulling piston rod is threadedly connected to the mandrel base;

[0008] A guide sleeve is arranged inside the nose cap, and the core rod passes through the guide sleeve, and one end of the guide sleeve away from the nose cap is threadedly connected to the core rod base, and the guide sleeve has a sleeve with a hollow area;

[0009] A gun pull shell is threadedly connected to the inner side of the open end of the hollow area of ​​the nose cap, the gun pull shell is a hollow sleeve, and the gun pull piston rod is arranged inside the gun pull shell;

[0010] A multi-slot bushing, one end of which is disposed inside the guide sleeve and the other end of which extends to the outside of the first through hole, the mandrel is inserted into the multi-slot bushing, and one end of the multi-slot bushing away from the nose cap is gap-matched with the inner side surface of the hollow area of ​​the guide sleeve;

[0011] A spring, one end of which is connected to the multi-slot bushing and the other end of which is connected to the mandrel base, and the mandrel passes through the spring;

[0012] The gun pulling piston rod has one end threadedly connected to the inside of the hollow structure of the core rod base, and the other end slidably connected to the inside of the gun pulling shell.

[0013] Optionally, the core rod and the multi-slot bushing are high-strength steel structures.

[0014] Optionally, the core rod is a slender shaft with a thin middle end and thick two ends, the part where the core rod is connected to the core rod base has a threaded pair, and the other end is an outer cylindrical support section, and the outer cylindrical support section is used to support the multi-slot bushing.

[0015] Optionally, one end of the outer cylindrical support section is a guide cone with a cone angle of α, which is used to guide the core rod to enter and open the multi-slot bushing during cold extrusion strengthening.

[0016] Optionally, the multi-slot bushing is a hollow sleeve, one end of which is provided with a plurality of longitudinally evenly distributed long groove cylindrical structures.

[0017] Optionally, the multi-slot bushing includes a rear cone section, a working section, a front cone section and a guide section which are arranged in sequence, the cone angle of the rear cone section is γ, and the range of γ is 10° to 20°, the working section is a hollow cylinder, the end of the guide section away from the front cone section abuts against the spring, and the cone angle of the front cone section is β, and the range of β is 1.5° to 5°.

[0018] Optionally, a structural plate is provided on the outer side of one end of the nose cap having the first through hole, the multi-slit bushing passes through the structural plate, and a second through hole is opened in the middle of the structural plate.

[0019] Optionally, an earless support plate self-locking nut is further provided at one end of the structural plate away from the nose cap, and one end of the earless support plate self-locking nut is inserted into the second through hole of the structural plate.

[0020] The beneficial effects of this application include:

[0021] The maximum outer diameter on the right side of the multi-slot bushing provided in the present application is the guide section, and the compression spring is between the multi-slot bushing and the mandrel base. When the rightward axial resultant force of the external force F1 acting on the left end face of the multi-slot bushing is greater than the elastic force of the spring, the multi-slot bushing begins to slide rightward in the guide sleeve, and the head of the multi-slot bushing begins to shrink radially from diameter φd to diameter φd2, and the diameter φd2 is slightly smaller than the cold extrusion hole diameter φd3 of the earless support plate self-locking nut. The left end face of the nose cap is close to the structural surface and remains motionless. The gun is started, the gun piston rod moves to the right, and the mandrel also starts to move to the right. The multi-slot bushing remains in its original position under the action of the spring elastic force, and the gun piston rod continues to move to the right. The mandrel expands the multi-slot bushing to restore its diameter to φd, and the mandrel drives the multi-slot bushing to move rightward together, and at the same time passes through the cold extrusion hole φd3 of the earless support plate self-locking nut, and the extrusion process ends. The present application provides a single-sided cold extrusion operation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the cross-sectional structure of the cold extrusion strengthening device;

[0023] Figure 2 This is a schematic diagram of the explosion structure of the cold extrusion strengthening device;

[0024] Figure 3 It is a schematic diagram of the structure of the multi-slit bushing in a contracted state when subjected to an external force F1;

[0025] Figure 4 It is a schematic diagram of the multi-slit bushing structure;

[0026] Figure 5 It is a schematic diagram of the mandrel structure;

[0027] Figure 6 This is a schematic diagram of radial contraction of a multi-slot bushing;

[0028] Figure 7 for Figure 6 A partial enlarged view of part A;

[0029] Figure 8 It is a schematic diagram of the cold extrusion device after inserting the earless support plate self-locking nut into the cold extrusion hole and before cold extrusion;

[0030] Fig. 9 for Figure 8 A partial enlarged view of part B;

[0031] Fig.10 It is a schematic diagram of the state where the mandrel begins to open the multi-slot bushing;

[0032] Fig.11 for Fig.10 A partial enlarged view of part C;

[0033] Fig.12This is a schematic diagram of the first step of cold extrusion completion;

[0034] Fig.13 This is a schematic diagram of the state of step one of the riveting process;

[0035] Fig.14 This is a schematic diagram of the state of step 2 of the riveting process;

[0036] Fig.15 This is a schematic diagram of the state of step three of the riveting process;

[0037] List of parts and figure marks: 1. Mandrel; 2. Multi-slot bushing; 20. Rear cone section; 21. Working section; 22. Front cone section; 23. Guide section; 3. Nose cap; 4. Guide sleeve; 5. Spring; 6. Mandrel base; 7. Structural plate; 8. Self-locking nut without ear support plate; 9. Limiting ring; 10. Rivet screw; 11. Pull gun piston rod; 12. Pull gun housing; 13. Self-locking nut without ear support plate; 14. Guide cone; 15. Outer cylindrical support section. DETAILED DESCRIPTION

[0038] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0039] The utility model provides a cold extrusion strengthening device, comprising:

[0040] The nose cap 3 has a hollow area at one end and a first through hole at the other end.

[0041] A mandrel 1, one end of which passes through the first through hole, and the other end of which is disposed inside the nose cap 3;

[0042] A mandrel base 6, one end of which is threadedly connected to the mandrel 1, and the other end of which is a hollow sleeve structure in which a gun pulling piston rod 11 is arranged, and the gun pulling piston rod 11 is threadedly connected to the mandrel base 6;

[0043] The gun casing 12 is threadedly connected to the inner side of the opening end of the hollow area of ​​the nose cap 3, the gun casing 12 is a hollow sleeve, and the gun piston rod 11 is arranged inside the gun casing 12;

[0044] One end of the gun piston rod 11 is threadedly connected to the inside of the hollow structure of the core rod base 6, and the other end is slidably connected to the inside of the gun housing 12.

[0045] A spring 5, one end of which is connected to the multi-slot bushing 2, and the other end of which is connected to the mandrel base 6, and the mandrel 1 passes through the spring 5;

[0046] A guide sleeve 4 is arranged inside the nose cap 3, and the mandrel 1 passes through the guide sleeve 4. One end of the guide sleeve 4 away from the nose cap 3 is threadedly connected to the mandrel base 6. The guide sleeve 4 has a sleeve with a hollow area;

[0047] A multi-slot bushing 2, one end of which is arranged inside the guide sleeve 4, and the other end extends to the outside of the first through hole, and the mandrel 1 is inserted into the multi-slot bushing 2, and the maximum outer cylindrical surface on the right side of the multi-slot bushing 2 is gap-matched with the hollow inner cylindrical surface of the guide sleeve 4, and the multi-slot bushing 2 can slide left and right when subjected to an elastic force to the right greater than that of the spring 5;

[0048] The multi-slot bushing 2 is a hollow sleeve, one end of which is provided with a plurality of longitudinally evenly distributed long groove cylindrical structures. In this embodiment, there are four long grooves. Theoretically, the number of the long grooves can be a natural number from 1 to n, which is evenly distributed within a range of 360°. The cross-section of the groove is symmetrical to the central plane passing through the axis and is rectangular or fan-shaped.

[0049] The multi-slot bushing 2 includes a rear cone section 20, a working section 21, a front cone section 22 and a guide section 23 which are arranged in sequence. The cone angle of the rear cone section 20 is γ, and the range of γ is 10° to 20°. The working section 21 is a hollow cylinder. The end of the guide section 23 away from the front cone section 22 abuts against the spring 5. The cone angle of the front cone section 22 is β, and the range of β is 1.5° to 5°.

[0050] The cone angle γ of the rear cone section 20 is the guide angle when the multi-slot bushing 2 is inserted into the cold extrusion hole φd3 of the earless support plate self-locking nut. The working section 21 is an outer cylindrical surface with a diameter of Φd. The front cone section 22 is a cone angle β, which is used to provide a guide angle for cold extrusion strengthening of the mandrel 1. The guide section 23 is an outer cylindrical surface to ensure that the multi-slot bushing 2 can slide left and right during cold extrusion strengthening. The right side of the guide section 23 has a smaller outer diameter as a shaft shoulder, which acts as a spring seat.

[0051] The core rod 1 is a slender shaft with a thin middle end and thick two ends. The end of the core rod 1 away from the nose cap 3 has a thread pair, and the thread pair is connected to the core rod base 6. The other end is an outer cylindrical support section 15 with a diameter of Φd0. The outer cylindrical support section 15 is used to support the multi-slot bushing 2.

[0052] The right end of the outer cylindrical support section 15 is a guide cone 14 with a cone angle of α, which is used to guide the core rod 1 to enter and open the multi-slot bushing 2 during cold extrusion strengthening.

[0053] The core rod 1 and the multi-slot bushing 2 are high-strength steel structures.

[0054] A structural plate 7 is disposed on the outer side of one end of the nose cap 3 having the first through hole, the multi-seam bushing 2 passes through the structural plate 7 , and a second through hole is opened in the middle of the structural plate 7 .

[0055] The end of the structural plate 7 away from the nose cap 3 is also provided with an earless support plate self-locking nut 13, one end of which is inserted into the second through hole of the structural plate 7.

[0056] It is worth noting that the maximum outer diameter on the right side of the multi-slot bushing 2 is the guide section 23, and the compression spring 5 is located between the multi-slot bushing 2 and the core rod base 6. When the axial resultant force of the rightward external force F1 is greater than the elastic force of the spring 5, the multi-slot bushing 2 begins to slide to the right in the guide sleeve 4, and the head of the multi-slot bushing 2 begins to shrink radially from the diameter φd to the diameter φd2, φd2 = φd1 × (0.85 ~ 0.92), and the diameter φd2 is slightly smaller than the cold extrusion hole diameter φd3 of the earless support plate self-locking nut. The left end face of the nose cap 3 is close to the right surface of the structure 7 and remains motionless. Start the pulling gun, the pulling gun piston rod 11 moves to the right, and the core rod 1 also starts to move to the right. The multi-slot bushing 2 remains in its original position under the elastic force of the spring 5, and the pulling gun piston rod 11 continues to move to the right. The core rod 1 stretches the multi-slot bushing 2 to restore its diameter to φd, and the core rod 1 drives the multi-slot bushing 2 to move to the right together and pass through the cold extrusion hole at the same time, and the extrusion process ends.

[0057] The implementation method in this embodiment is divided into two major steps: cold extrusion assembly and riveting.

[0058] Step 1: Cold extrusion assembly

[0059] 1)Reference Figure 1 As shown, the cold extrusion device is in the initial state, and the head of the multi-slot bushing 2 is stretched open by the support section φd0 of the mandrel 1 under the action of the spring force 5, and its head diameter is the maximum value φd;

[0060] 2) Manually insert the earless support plate self-locking nut 8 into the hole of the structural plate 7, and then move the cold extrusion device to the left as a whole, so that the head of the multi-slot bushing 2 is close to the edge of the cold extrusion hole φd3 of the earless support plate self-locking nut 8, and the cone surface of the rear cone section 20 of the multi-slot bushing 2 is subjected to the rightward external force F1. When the combined external force F1 is greater than the elastic force of the spring 5, the spring begins to compress and the multi-slot bushing 2 begins to contract radially (refer to Figure 6 Continue to push the cold extrusion device to the left as a whole until the cone angle of the rear cone section 20 of the multi-slit bushing 2 is against the self-locking nut 8 of the earless support plate, the force is F2, and the left end face of the nose cap 3 is in close contact with the right surface of the structural plate 7 (reference Figure 7 );

[0061] 3) Press the gun start switch and keep it still. The gun piston rod 11 drives the core rod 1 to move to the right. The core rod 1 starts to open the multi-slit bushing 2 at a certain moment (refer to Figure 8 As shown), until the cold extrusion hole φd3 (reference Fig. 9 As shown), the cold extrusion installation process is completed;

[0062] 4) Remove the cold extrusion device, and the first step of cold extrusion of the self-locking nut 13 without ear support is completed (reference Fig.10 shown).

[0063] Step 2: Riveting process

[0064] Use a rivet gun to complete the rivet assembly. The implementation method is as follows:

[0065] 1)Reference Fig.11 As shown, manually insert the rivet screw 10 of the pulling gun from the nut head and push it forward slightly so that its thread is pressed against the threaded hole of the earless support plate self-locking nut 8. At this time, the rivet screw 10 is automatically screwed in. When the limit ring 9 fits the end surface of the structural plate 7, release the external force.

[0066] 2)Reference Fig.12 As shown, the pulling gun is started, the rivet screw 10 moves to the right and starts to pull the rivet to form a bulge;

[0067] 3)Reference Fig.13 As shown, after the riveting is completed, press and hold the rivet gun button B and pull the rivet screw 10 to flip over.

[0068] Remove from nut.

[0069] The device in this embodiment is suitable for cold extrusion strengthened precipitation hardened stainless steel, aviation titanium alloy, aviation aluminum alloy, composite materials and other material structural holes, including single-layer or multi-layer structural plates, and any combination of structural plates made of different materials.

[0070] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A cold extrusion strengthening device, characterized in that: include: A nose cap (3) having a hollow area at one end and a first through hole at the other end; A mandrel (1), one end of the mandrel (1) passing through the first through hole, and the other end of the mandrel (1) being arranged inside the nose cap (3); A mandrel base (6), one end of which is threadedly connected to the mandrel (1), and the other end of which is a hollow sleeve structure in which a gun pulling piston rod (11) is arranged, and the gun pulling piston rod (11) is threadedly connected to the mandrel base (6); A guide sleeve (4) is arranged inside the nose cap (3), and the mandrel (1) passes through the guide sleeve (4); one end of the guide sleeve (4) away from the nose cap (3) is threadedly connected to the mandrel base (6); and the guide sleeve (4) has a sleeve with a hollow area; A gun casing (12) is threadedly connected to the inner side of the open end of the hollow region of the nose cap (3); the gun casing (12) is a hollow sleeve, and the gun piston rod (11) is arranged inside the gun casing (12); A multi-slot bushing (2), one end of which is arranged inside the guide sleeve (4) and the other end of which extends to the outside of the first through hole, and the mandrel (1) is inserted into the multi-slot bushing (2), and one end of the multi-slot bushing (2) away from the nose cap (3) is gap-matched with the inner side surface of the hollow area of ​​the guide sleeve (4); A spring (5), one end of which is connected to the multi-slot bushing (2), and the other end of which is connected to the mandrel base (6), and the mandrel (1) passes through the spring (5); One end of the gun piston rod (11) is threadedly connected to the inside of the hollow structure of the core rod base (6), and the other end is slidably connected to the inside of the gun housing (12).

2. A cold extrusion strengthening device according to claim 1, characterized in that: The core rod (1) and the multi-slot bushing (2) are high-strength steel structures.

3. A cold extrusion strengthening device according to claim 1, characterized in that: The core rod (1) is a slender shaft with a thin middle end and thick ends. The portion where the core rod (1) is connected to the core rod base (6) has a threaded pair, and the other end is an outer cylindrical support section (15). The outer cylindrical support section (15) is used to support the multi-slot bushing (2).

4. A cold extrusion strengthening device according to claim 3, characterized in that: One end of the outer cylindrical support section (15) is a guide cone (14) with a cone angle of α, which is used to guide the core rod (1) to enter and open the multi-slot bushing (2) during cold extrusion strengthening, and the range of α is 5° to 10°.

5. The cold extrusion strengthening device according to claim 1, characterized in that: The multi-slot bushing (2) is a hollow sleeve, one end of which is provided with a plurality of longitudinally evenly distributed long slot cylindrical structures.

6. A cold extrusion strengthening device according to claim 5, characterized in that: The multi-slot bushing (2) comprises a rear cone section (20), a working section (21), a front cone section (22) and a guide section (23) which are arranged in sequence. The cone angle of the rear cone section (20) is γ, and the range of γ is 10° to 20°. The working section (21) is a hollow cylinder. The end of the guide section (23) away from the front cone section (22) abuts against the spring (5). The cone angle of the front cone section (22) is β, and the range of β is 1.5° to 5°.

7. The cold extrusion strengthening device according to claim 1, characterized in that: A structural plate (7) is arranged on the outer side of one end of the nose cap (3) having a first through hole, the multi-slit bushing (2) passes through the structural plate (7), and a second through hole is opened in the middle of the structural plate (7).

8. A cold extrusion strengthening device according to claim 7, characterized in that: An earless support plate self-locking nut (13) is also provided at one end of the structural plate (7) away from the nose cap (3), and one end of the earless support plate self-locking nut (13) is inserted into the second through hole of the structural plate (7).

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