Explosive welding local defect repairing device and method

Abstract

The invention discloses an explosive welding local defect repairing device and method.The explosive welding local defect repairing device comprises a mounting frame provided with a movable support and an inflation assembly, the movable support is used for adjusting the inclination angle of a gun barrel assembly, and the inflation assembly is used for providing power for the gun barrel assembly; and a piston and a compound plate are arranged in the gun barrel assembly, and the inflation assembly provides power for the piston to control the compound plate to rush to the defect area of the compound plate located at an outlet of the gun barrel assembly so as to achieve local defect repair. The method effectively solves the problem that the refractory rare metal and two kinds of metal cannot be repaired through fusion welding, and has the advantages of being easy to operate, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of explosive welding, and in particular to a device and method for repairing local defects in explosive welding. Background Art

[0002] Explosive welding is a special welding method. Through explosive welding, composite plates made of various metal combinations can be obtained. As of now, there are more than 300 kinds of explosive welded composite plates of alloy metals. Due to the simple explosive welding process, the composite metal plates have many advantages such as excellent bonding performance, high bonding strength and strong reprocessing ability. At present, explosive composite metal plates have been widely used in many industries such as petrochemical industry, metallurgical products, mechanical casting, aerospace, etc.

[0003] However, during the explosive welding process, the composite metal plates are prone to small-area bulging, loose bonding in some areas, incomplete bonding in the edge areas, and poor welding in the detonator area. Therefore, this has a great impact on the subsequent processing process, reducing the efficiency of the subsequent processing process.

[0004] Small defects exist in composite metal plates after explosive welding. When repairing the defects, due to the different organizational structures between the metal materials, some metal combinations are difficult to weld to each other, and cracks are easily generated after welding. For example, when titanium-steel composite metal plates are directly fusion-welded, Ti-Fe intermetallic compounds are easily generated, and cracks are generated after fusion welding repair. Therefore, it is difficult to fusion-weld the titanium-steel composite metal plates, resulting in waste of the entire composite metal plate material; or because the reaction heat between the combination of dissimilar metal materials is positive and the properties of the components are quite different, their direct alloying and corresponding material preparation are very difficult, resulting in small defects between the composite metal plates that need to be repaired.

[0005] Therefore, there is an urgent need to develop a device for repairing local defects of refractory rare metals and metal combinations where two metals cannot be repaired by fusion welding. Summary of the Invention

[0006] Based on the technical problems existing in the background technology, the present invention proposes an explosive welding local defect repair device and method, which effectively solves the problem that refractory rare metals and two metals cannot be repaired by fusion welding, and has the advantages of simple operation and low cost.

[0007] The explosive welding local defect repair device proposed by the present invention comprises:

[0008] The mounting frame is provided with a movable bracket and an inflation assembly, wherein the movable bracket is used to adjust the tilt angle of the barrel assembly, and the inflation assembly is used to provide power to the barrel assembly;

[0009] The barrel assembly is provided with a piston and a composite plate inside. The piston is powered by the inflation assembly to control the composite plate to rush toward the defective area of ​​the composite plate at the outlet of the barrel assembly to achieve local defect repair.

[0010] Preferably, the barrel assembly includes a first-level barrel and a second-level barrel that are connected to each other, a pressure valve is provided between the first-level barrel and the second-level barrel, the pressure valve separates the first-level barrel and the second-level barrel through a pressure plate, the piston is located in the first-level barrel, the doubler plate is located in the second-level barrel, the inflation assembly is connected to the first-level barrel, and gas is introduced into the first-level barrel to allow the piston to penetrate the pressure plate and push the doubler plate toward the defective area.

[0011] Preferably, the inflation assembly includes a nitrogen cylinder and a gas storage chamber located on the mounting frame, the gas storage chamber is provided with a nitrogen outlet and a nitrogen inlet, the nitrogen inlet is connected to the nitrogen cylinder through a pipeline, and the nitrogen outlet is connected to the first-level gun barrel.

[0012] Preferably, a connector is detachably provided at one end of the first-stage barrel away from the second-stage barrel, an air inlet is provided through the connector, and the air inlet is connected to the nitrogen outlet through a pipeline.

[0013] Preferably, the inflation assembly further comprises an inert gas cylinder, and the inert gas cylinder is connected to the inert gas inlet provided on the first-stage gun barrel through a pipeline.

[0014] Preferably, an adjustment tube is provided at one end of the secondary gun barrel away from the primary gun barrel, an electromagnetic coil is provided on the adjustment tube, a plate support is provided at one side of the double plate away from the composite plate, and the double plate and / or plate support are magnetic.

[0015] Preferably, a limit ring and a magnetic ring are further provided at one end of the secondary gun barrel close to the pressurizing valve.

[0016] Preferably, the movable support comprises a crossbeam, a transverse hydraulic rod, a longitudinal hydraulic rod, a barrel clamp and a steering servo;

[0017] The longitudinal hydraulic rod is fixedly installed inside the mounting frame, and the extended end of the longitudinal hydraulic rod is fixedly connected to one end of a crossbeam slidably installed on one side of the mounting frame;

[0018] A mounting groove is provided on one side of the crossbeam close to the first-stage gun barrel; a lateral hydraulic rod is fixedly installed at one end of the mounting groove, and an extended end of the lateral hydraulic rod is fixedly connected to the steering servo;

[0019] The steering servo is slidably mounted in the mounting groove, and the output end of the steering servo is fixedly mounted to the gun barrel clamp.

[0020] The repair method of the explosive welding local defect repair device proposed by the present invention has the following steps:

[0021] S1: Determination of impact angle;

[0022] S2: Fix the barrel assembly through the movable bracket so that the inclination angle of the barrel assembly is the same as the impact angle determined by S1;

[0023] S3: The piston in the barrel assembly is pressurized by the inflation assembly. The pressurized piston rushes toward the composite plate. Under the action of the impact force, the composite plate flies toward the defective area of ​​the composite plate to achieve local defect repair.

[0024] Beneficial technical effects of the present invention:

[0025] The present invention uses compressed gas to generate impact energy instead of the existing method of generating impact energy on the composite plate by explosives, which greatly improves the safety level; the electromagnetic coil provided on the secondary gun barrel can correct the posture of the composite plate rushing out of the gun barrel through the formed magnetic field, thereby improving the effect of repairing the defective area; the movable bracket is used to adjust the impact angle of the gun barrel, so that the composite plate can repair the defective area more completely and with a higher degree of fit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the explosive welding local defect repair device proposed by the present invention;

[0027] Figure 2 This is a partial AA schematic diagram of the explosive welding local defect repair device proposed in the present invention;

[0028] Figure 3 This is a partial BB schematic diagram of the explosive welding local defect repair device proposed by the present invention;

[0029] Figure 4 Schematic diagram of explosive welding parameter window and theoretical boundary;

[0030] Figure 5 This is a schematic diagram of the movable bracket structure of the present invention;

[0031] In the figure: 1-mounting frame, 2-gas storage chamber, 3-nitrogen outlet, 4-movable bracket, 41-crossbeam, 42-transverse hydraulic rod, 43-steering servo, 44-barrel clamp, 45-mounting slot, 5-nitrogen inlet, 6-nitrogen cylinder, 7-inert gas cylinder, 8-composite plate, 9-defect area, 10-electromagnetic coil, 11-regulating tube, 12-secondary barrel, 13-first barrel, 14-piston, 15-connector, 16-inlet hole, 17-limiting ring, 18-composite plate, 19-plate support, 20-magnetic ring, 21-pressurization valve, 22-pressurization sheet, 23-inert gas inlet. DETAILED DESCRIPTION

[0032] The present invention will be further explained below with reference to specific embodiments.

[0033] Reference Figure 1-3 The explosive welding local defect repair device proposed in the present invention includes: a mounting frame 1, which is provided with a movable bracket 4 and an inflation component, the movable bracket 4 is used to adjust the inclination angle of the barrel assembly, and the inflation component is used to provide power to the barrel assembly; the barrel assembly is internally provided with a piston 14 and a composite plate 18, and the inflation component provides power to the piston to control the composite plate 18 to rush toward the defect area 9 of the composite plate 8 located at the outlet of the barrel assembly to achieve local defect repair.

[0034] The present invention applies pressure to the piston through the inflatable component to push the doubler plate 18 toward the defective area 9 of the composite plate 8, and the doubler plate repairs the defective area under the action of the impact force.

[0035] Specifically, the barrel assembly includes a first-level barrel 13 and a second-level barrel 12 that are connected to each other. A pressure valve 21 (model: Feisite ZTT-100, purchased from Binzhou Feisite Valve Co., Ltd.) is provided between the first-level barrel 13 and the second-level barrel 12. The pressure valve 21 separates the first-level barrel 13 and the second-level barrel 12 through a pressure plate 22. The pressure valve is connected to a pressure pump (not shown in the figure). During the use of the device, the pressure pump is used to pressurize the pressure valve, and the first-level barrel and the second-level barrel are clamped inside the pressure valve to prevent the two barrels from having a gap or separation; the piston 14 is located in the first-level barrel 13, and the composite plate 18 is located in the second-level barrel 12. The inflation assembly is connected to the first-level barrel 13, and gas is introduced into the first-level barrel 13 to allow the piston 14 to penetrate the pressure plate 22 and push the composite plate 18 toward the defective area 9.

[0036] In addition, the inflation assembly includes a nitrogen cylinder 6 and a gas storage chamber 2 located on the mounting frame 1. The gas storage chamber 2 is provided with a nitrogen outlet 3 and a nitrogen inlet 5. The nitrogen inlet 5 is connected to the nitrogen cylinder 6 through a pipeline, and the nitrogen outlet 3 is connected to the first-level gun barrel 13.

[0037] A connector 15 is detachably provided at one end of the first-stage barrel 13 away from the second-stage barrel 12 . An air inlet 16 is provided through the connector 15 . The air inlet 16 is connected to the nitrogen outlet 3 through a pipeline.

[0038] To further regulate the piston's impact force on the composite sheet, the inflation assembly 3 also includes an inert gas cylinder 7, which is connected to an inert gas inlet 23 on the first-stage barrel 13 via a pipeline. During use, a certain amount of inert gas is first charged between the piston and the pressure valve from the inert gas cylinder. Then, helium is introduced into the first-stage barrel through the gas storage chamber. The piston compresses the inert gas. When the pressure breaks through the pressure plate, the piston moves at high speed within the barrel and pushes the composite sheet toward the defective area, completing the repair.

[0039] To adjust the direction of the composite plate as it flies out of the barrel, an adjustment tube 11 is installed at the end of the secondary barrel 12 away from the primary barrel 13. An electromagnetic coil 10 (purchased from Shanghai Puquan Electric Co., Ltd.) is mounted on the adjustment tube 11. A plate support 19 is installed on the side of the composite plate 18 away from the composite plate 8. The plate support and the composite plate 18 are fixedly connected by bonding. The composite plate 18 and / or the plate support 19 are magnetic. By energizing the electromagnetic coil, the magnetic field it creates adjusts the direction of the composite plate's flight.

[0040] In order to prevent the doubler plate 18 from sliding down in the secondary barrel due to gravity, a limit ring 17 and a magnetic ring 20 are further provided at one end of the secondary barrel 12 close to the pressure valve 20 .

[0041] like Figure 5 As shown, in order to conveniently adjust the angle of the barrel assembly relative to the defective area 9 to ensure the accuracy and stability of the repair, the movable bracket 4 includes a crossbeam 41, a transverse hydraulic rod 42, a longitudinal hydraulic rod, a barrel clamp 44 and a steering servo 43;

[0042] The longitudinal hydraulic rod is fixedly installed inside the mounting frame 1, and the extended end of the longitudinal hydraulic rod is fixedly connected to one end of the crossbeam 41 slidably installed on one side of the mounting frame 1.

[0043] A mounting slot 45 is provided on one side of the crossbeam 41 close to the first-stage barrel 13; a traverse hydraulic rod 42 is fixedly mounted on one end of the mounting slot 45, and an extended end of the traverse hydraulic rod 42 is fixedly connected to a steering servo 43;

[0044] The steering servo 43 is slidably mounted in the mounting groove 45 , and the output end of the steering servo 43 is fixedly mounted to the barrel clamp 44 .

[0045] The barrel clamp 44 is put on the outside of the first-level barrel to fix the first-level barrel on the crossbeam 41, and then the height of the barrel clamp 44 is adjusted by the longitudinal hydraulic rod, the horizontal position of the barrel clamp 44 is adjusted by the transverse hydraulic rod 42, and the steering angle of the barrel clamp 44 is adjusted by the steering servo 43, so as to achieve the purpose of comprehensively adjusting the orientation of the first-level barrel 13, making the repair of local defects of the barrel more flexible and accurate.

[0046] The repair method of the explosive welding local defect repair device proposed by the present invention has the following steps:

[0047] S1: Determination of impact angle;

[0048] S2: Fix the barrel assembly through the movable bracket so that the inclination angle of the barrel assembly is the same as the impact angle determined by S1;

[0049] S3: The piston in the barrel assembly is pressurized by the inflation assembly. The pressurized piston rushes toward the composite plate. Under the action of the impact force, the composite plate flies toward the defective area of ​​the composite plate to achieve local defect repair.

[0050] The impact angle of the composite plate of the present invention is based on v p =2Dsin(θ / 2) for calculation, where D is the detonation velocity of the explosive and θ is the throwing angle.

[0051] The welding window is defined by four boundary lines: Figure 4 , which include: welding lower limit, flow limit, sonic speed limit and welding upper limit.

[0052] Welding lower limit Figure 2 Center ad line, collision velocity v between base and double plate p Must be greater than a minimum speed value v pmin , to form a jet.

[0053]

[0054] Where K C is the empirical coefficient, K C The size depends on the ratio of the surface roughness of the metal to be welded to the thickness of the jet, HV is the Vickers hardness, and ρ is the density.

[0055] Welding limit as Figure 2 The middle bc line limits the maximum energy of the welding interface. When the collision kinetic energy is too large, the heat deposited at the welding interface is too high. After the impact pressure is unloaded, the interface is still in a thermally softened or melted state, which will cause the welding to fail due to "over-melting".

[0056]

[0057] Wherein, subscripts 1 and 2 represent the base layer and composite layer, h1 and h2 are the thickness of the base and composite plates, and f is a constant related to the physical properties of the metal.

[0058] Flow limit Figure 2 The middle line ab, the speed of the collision point v c It must reach a certain size, otherwise micro jets will not be generated.

[0059]

[0060] Where σ b For intensity level.

[0061] Further, if Figure 2 The middle cd line means that the welding collision flow must be subsonic to form a welding jet.

[0062] v cmax =min(C 01 , C 02 )

[0063] Where C 01 , C 02 is the body wave velocity of the composite plate material.

[0064] As mentioned above, the impact speed of the double plate support and double plate flying out of the secondary gun muzzle is:

[0065]

[0066] Where D b is the inner diameter of the first-stage barrel, D f is the inner diameter of the secondary barrel, M h is the quality of the double plate support and double plate, M d is the piston mass, where the gas pressure can be replaced by the chemical energy E of the gas C The impact velocity of the double plate support and double plate can be replaced by the kinetic energy E d After converting and solving the above parameters, the impact velocity of the double plate support and the double plate flying out of the secondary gun barrel can be obtained.

Claims

1. Explosion welding local defect repair device, characterized in that: include: The mounting frame (1) is provided with a movable bracket (4) and an inflatable assembly, wherein the movable bracket (4) is used to adjust the inclination angle of the gun barrel assembly, and the inflatable assembly is used to provide power to the gun barrel assembly; A barrel assembly is provided with a piston (14) and a composite plate (18) inside, and the piston is powered by an inflatable assembly to control the composite plate (18) to rush toward a defective area (9) of a composite plate (8) located at an outlet of the barrel assembly to achieve local defect repair.

2. The explosive welding local defect repairing device according to claim 1 is characterized in that: The barrel assembly comprises a first-stage barrel (13) and a second-stage barrel (12) connected to each other, a pressure valve (21) is arranged between the first-stage barrel (13) and the second-stage barrel (12), the pressure valve (21) separates the first-stage barrel (13) and the second-stage barrel (12) through a pressure plate (22), the piston (14) is located in the first-stage barrel (13), the double plate plate (18) is located in the second-stage barrel (12), the inflation assembly is connected to the first-stage barrel (13), and gas is introduced into the first-stage barrel (13) so that the piston (14) penetrates the pressure plate (22) and pushes the double plate plate (18) toward the defective area (9).

3. The explosive welding local defect repairing device according to claim 2 is characterized in that: The inflation assembly comprises a nitrogen gas cylinder (6) and a gas storage chamber (2) located on a mounting frame (1); the gas storage chamber (2) is provided with a nitrogen gas outlet (3) and a nitrogen gas inlet (5); the nitrogen gas inlet (5) is connected to the nitrogen gas cylinder (6) through a pipeline, and the nitrogen gas outlet (3) is connected to the first-stage gun barrel (13).

4. The explosive welding local defect repairing device according to claim 3 is characterized in that: A connector (15) is detachably provided at one end of the first-stage gun barrel (13) away from the second-stage gun barrel (12); an air inlet (16) is provided through the connector (15); and the air inlet (16) is connected to the nitrogen outlet (3) through a pipeline.

5. The explosive welding local defect repairing device according to claim 3 is characterized in that: The inflation assembly (3) further comprises an inert gas cylinder (7), and the inert gas cylinder (7) is connected to an inert gas inlet (23) provided on the first-stage gun barrel (13) through a pipeline.

6. The explosive welding local defect repairing device according to claim 2 is characterized in that: An adjusting tube (11) is arranged at one end of the secondary gun barrel (12) away from the primary gun barrel (13), an electromagnetic coil (10) is arranged on the adjusting tube (11), and a plate support (19) is arranged at one side of the composite plate (18) away from the composite plate (8), and the composite plate (18) and / or the plate support (19) are magnetic.

7. The explosive welding local defect repairing device according to claim 6 is characterized in that: A limit ring (17) and a magnetic ring (20) are also provided at one end of the secondary gun barrel (12) close to the pressure valve (20).

8. The explosive welding local defect repairing device according to claim 1 is characterized in that: The movable support (4) comprises a crossbeam (41), a transverse hydraulic rod (42), a longitudinal hydraulic rod, a gun barrel clamp (44) and a steering servo (43); The longitudinal hydraulic rod is fixedly mounted inside the mounting frame (1), and the extended end of the longitudinal hydraulic rod is fixedly connected to one end of a crossbeam (41) slidably mounted on one side of the mounting frame (1). A mounting groove (45) is provided on one side of the cross beam (41) close to the first-stage gun barrel (13); a lateral hydraulic rod (42) is fixedly mounted on one end of the mounting groove (45), and an extended end of the lateral hydraulic rod (42) is fixedly connected to a steering servo (43); The steering servo (43) is slidably mounted in the mounting groove (45), and the output end of the steering servo (43) is fixedly mounted on the gun barrel clamp.

9. The repair method of the explosive welding local defect repair device according to any one of claims 1 to 8, characterized in that: The steps are as follows: S1: Determination of impact angle; S2: Fix the barrel assembly by means of a movable bracket so that the inclination angle of the barrel assembly is the same as the impact angle determined by S1; S3: The piston in the barrel assembly is pressurized by the inflation assembly, and the pressurized piston rushes toward the composite plate. Under the action of the impact force, the composite plate flies to the defective area of ​​the composite plate to achieve local defect repair.

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