A large-diameter thin-walled nickel-titanium composite pipe

Abstract

The present invention relates to the technical field of composite pipes, and specifically relates to a large-diameter thin-walled nickel-titanium composite pipe, which is prepared by an explosion cladding method; the present invention changes the assembly method of the composite pipe, the effective work direction of the explosive, and the initiation method and other means to finally achieve the purpose of explosion cladding of thin-walled large-diameter pipes. For the composite pipes produced by this method, the bonding rate after explosion cladding reaches 100%.

Description

Technical Field

[0001] The present invention relates to the technical field of composite pipes, and particularly relates to a large-diameter thin-walled nickel-titanium composite pipe. Background Art

[0002] As a new type of industrial product, composite products can have their materials and thicknesses freely combined to meet the needs of different users. Composite products simultaneously possess the excellent properties of two materials. As a resource-saving product, composite products reduce the consumption of precious metals and greatly reduce the project cost. Achieving the perfect combination of low cost and high performance, they have good social benefits and are widely used in industries such as petroleum, chemical industry, salt industry, water conservancy and electric power. Stainless steel, nickel, copper, titanium, etc. have become an indispensable metal in our lives. However, the use cost of pure materials is relatively high, and it is easy to cause waste of resources. Therefore, when using these materials in industry, composite plates are usually adopted to make up for the problem of high price cost.

[0003] Explosion cladding is achieved by making two materials produce serrated bites through the high temperature and high pressure generated during explosion, so as to achieve atomic bonding. However, the huge energy generated during the explosion cladding process causes huge deformation or even tearing of the pipe with a relatively thin wall thickness, making the cladding between thin-walled pipes a major problem.

[0004] Due to the above reasons, the explosion cladding method for large-diameter and thin-walled composite plates is of great significance to the industry.

[0005] In summary, developing a large-diameter thin-walled nickel-titanium composite pipe is a key problem that urgently needs to be solved in the technical field of composite pipes. Summary of the Invention

[0006] Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a large-diameter thin-walled nickel-titanium composite pipe. For the produced composite pipe, the bonding rate reaches 100% after explosion cladding, and the ray detection result meets the requirements of Grade II in the ray detection of Part 2 of NB / T47013-2015 "Non-destructive Testing of Pressure Equipment".

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a large-diameter thin-walled nickel-titanium composite pipe, which is prepared by an explosion cladding method. The explosion cladding method includes the following steps:

[0009] (1) Polish the inner wall of the nickel pipe and the outer wall of the titanium pipe before explosion for standby.

[0010] (2) Prepare auxiliary tools, where the auxiliary tools include a wooden rod A for adjusting the amount of medicine, a support B for adjusting the circumferential spacing between the nickel tube and the titanium tube, a support C for adjusting the circumferential spacing between the wooden rod A and the inner wall of the titanium tube, a backing plate D for fixing the nickel tube, the titanium tube, and the wooden rod A, and a reinforcement device E for reinforcement;

[0011] (3) Horizontally place the backing plate D on the explosion site, sequentially place the lower ends of the wooden rod A, the titanium tube, and the nickel tube into the corresponding grooves on the backing plate D, then use 4 supports C to support the upper ends of the wooden rod A and the titanium tube at 90° intervals to make the circumferential spacing uniform, and use 4 supports B to support the upper ends of the titanium tube and the nickel tube at 90° intervals to make the circumferential spacing uniform. Finally, put the reinforcement device E over the nickel tube;

[0012] (4) Set the spacing between the wooden rod A and the inner wall of the titanium tube to 20 mm, the spacing between the outer wall of the titanium tube and the inner wall of the nickel tube to 2 mm, and the spacing between the reinforcement device E and the outer wall of the nickel tube to ≤0.5 mm;

[0013] (5) Wind a detonating cord around the upper end of the wooden rod A, with its height 5 mm lower than the upper end of the titanium tube. Load explosives into the gap between the wooden rod A and the inner wall of the titanium tube, and perform the explosion cladding operation.

[0014] A further setting of the present invention is that: the backing plate D has concentric circular grooves for fixing and placing the wooden rod A, the titanium tube, and the nickel tube, and the depth of the grooves is 2 mm.

[0015] A further setting of the present invention is that: the wooden rod A is a solid wooden rod, and the height of the wooden rod A is 350 mm and the diameter is 180 mm.

[0016] A further setting of the present invention is that: the titanium tube is made of TA1 material, and the height of the titanium tube is 300 mm, the inner diameter is 220 mm, and the wall thickness is 3 mm.

[0017] A further setting of the present invention is that: the nickel tube is made of N02201 material, and the height of the nickel tube is 300 mm, the inner diameter is 230 mm, and the wall thickness is 3 mm.

[0018] A further setting of the present invention is that: the support B is a polypropylene "T" - shaped part, and in the extended length state, the dimensions of its three extended arms are all 2 mm × 2 mm × 10 mm.

[0019] A further setting of the present invention is that: the support C is a polypropylene "F" - shaped part, and in the extended length state, the dimensions of its two extended arms are both 2 mm × 2 mm × 5 mm, and the overall length is 2 mm × 2 mm × 32 mm.

[0020] A further setting of the present invention is that: the material of the device E is cast iron, and the height of the reinforcement part is 300 mm, the inner diameter is 337 mm, and the wall thickness is 30 mm.

[0021] Beneficial effects

[0022] Adopting the technical solution provided by the present invention, compared with the known public technology, it has the following

[0023] beneficial effects:

[0024] By changing the assembly method of the composite pipe and the effective work direction of the explosive, and changing the initiation method and other means, the present invention finally achieves the purpose of explosive cladding of thin-walled large-diameter pipes. For the composite pipe produced by this method, the bonding rate after explosive cladding reaches 100%, and the ray detection result meets the requirements of Grade II in the ray detection of Part 2 of NB / T47013-2015 "Non-destructive testing of pressure equipment", having a wide range of application prospects. Description of the drawings

[0025] Figure 1 It is a flow chart of the explosive method for large-diameter thin-walled nickel-titanium composite pipes of the present invention. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The present invention will be further described below in conjunction with the embodiments.

[0028] Embodiment:

[0029] As Figure 1 shown, the present invention provides a large-diameter thin-walled nickel-titanium composite pipe, which is prepared by an explosive cladding method. The explosive cladding method includes the following steps:

[0030] (1) Polish the inner wall of the nickel pipe and the outer wall of the titanium pipe before explosion for standby;

[0031] (2) Prepare auxiliary tools, where the auxiliary tools include a wooden stick A for adjusting the amount of explosive, a support B for adjusting the distance around the nickel pipe and the titanium pipe, a support C for adjusting the distance around the wooden stick A and the inner wall of the titanium pipe, a backing plate D for fixing the nickel pipe, the titanium pipe and the wooden stick A, and a reinforcing device E;

[0032] (3) Horizontally place the backing plate D on the explosion site. Sequentially place the lower ends of the wooden rod A, titanium tube, and nickel tube into the corresponding grooves on the backing plate D. Then, use 4 supports C to support the upper ends of the wooden rod A and the titanium tube at intervals of 90°, making the spacing uniform around. Also, use 4 supports B to support the upper ends of the titanium tube and the nickel tube at intervals of 90°, making the spacing uniform around. Finally, put the reinforcement device E over the nickel tube.

[0033] (4) Set the distance between the inner wall of the wooden rod A and the titanium tube to 20 mm, the distance between the outer wall of the titanium tube and the inner wall of the nickel tube to 2 mm, and the distance between the reinforcement device E and the outer wall of the nickel tube to ≤ 0.5 mm.

[0034] (5) Wind a detonating cord around the upper end of the wooden rod A, with its height 5 mm lower than the upper end of the titanium tube. Load explosives into the gap between the wooden rod A and the inner wall of the titanium tube, and conduct the explosive cladding operation.

[0035] Among them, the backing plate D has concentric circular grooves for fixing and placing the wooden rod A, titanium tube, and nickel tube, and the depth of the grooves is 2 mm.

[0036] The wooden rod A is a solid wooden rod, and the height of the wooden rod A is 350 mm and the diameter is 180 mm.

[0037] The titanium tube is made of TA1 material, and the height of the titanium tube is 300 mm, the inner diameter is 220 mm, and the wall thickness is 3 mm.

[0038] The nickel tube is made of N02201 material, and the height of the nickel tube is 300 mm, the inner diameter is 230 mm, and the wall thickness is 3 mm.

[0039] The support B is a polypropylene "T" - shaped part. In the extended length state, the dimensions of its three extended arms are all 2 mm × 2 mm × 10 mm (10 mm is the extended length).

[0040] The support C is a polypropylene "F" - shaped part. In the extended length state, the dimensions of its two extended arms are all 2 mm × 2 mm × 5 mm (5 mm is the extended length), and the overall length is 2 mm × 2 mm × 32 mm.

[0041] The material of the device E is cast iron, and the height of the reinforcement is 300 mm, the inner diameter is 337 mm, and the wall thickness is 30 mm.

[0042] It should be noted that the parameters such as the amount of explosive laid, the dimensions of the supports, and the tube spacing are all used specifically in the explosion cladding of the TA1 tube of D220×3 and the N02201 tube of D230×3. For other materials and specifications, they are also implemented according to this method. This method is applicable to stainless steel, nickel, copper, titanium, CS, LAS with a clad layer thickness of 2 mm - 8 mm. The bonding rate of the composite tube obtained by explosive cladding by the above method reaches 100%.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A large-diameter thin-walled nickel-titanium composite pipe, characterized in that, The large-diameter thin-walled nickel-titanium composite pipe is prepared by an explosive cladding method, and the explosive cladding method comprises the following steps: (1) Polish the inner wall of the nickel pipe and the outer wall of the titanium pipe before explosion for standby; (2) Prepare auxiliary tools, wherein the auxiliary tools include a wooden stick A for adjusting the amount of explosive, a support B for adjusting the spacing around the nickel pipe and the titanium pipe, a support C for adjusting the spacing between the wooden stick A and the inner wall of the titanium pipe around the perimeter, a backing plate D for fixing the nickel pipe, the titanium pipe, and the wooden stick A, and a reinforcement device E for reinforcement; (3) Horizontally place the backing plate D on the explosion site, sequentially place the lower ends of the wooden stick A, the titanium pipe, and the nickel pipe into the corresponding grooves on the backing plate D, then support the upper ends of the wooden stick A and the titanium pipe with 4 supports C at 90° intervals to make the spacing around the perimeter uniform, and support the upper ends of the titanium pipe and the nickel pipe with 4 supports B at 90° intervals to make the spacing around the perimeter uniform. Finally, put the reinforcement device E on the outside of the nickel pipe; The support B is a polypropylene "T" type part. In the extended length state, the dimensions of its three extended arms are all 2mm × 2mm × 10mm; The support C is a polypropylene "F" type part. In the extended length state, the dimensions of its two extended arms are all 2mm × 2mm × 5mm, and the overall length is 2mm × 2mm × 32mm; The material of the device E is cast iron, and the height of the reinforcement part is 300mm, the inner diameter is 337mm, and the wall thickness is 30mm; (4) The spacing between the wooden stick A and the inner wall of the titanium pipe is 20mm, the spacing between the outer wall of the titanium pipe and the inner wall of the nickel pipe is 2mm, and the spacing between the reinforcement device E and the outer wall of the nickel pipe is ≤ 0.5mm; (5) Wind a detonating cord around the upper end of the wooden stick A, with its height 5mm lower than the upper end of the titanium pipe. Load explosive into the gap between the wooden stick A and the inner wall of the titanium pipe, and perform the explosive cladding operation.

2. A large-diameter thin-walled nickel-titanium composite pipe according to claim 1, characterized in that, The backing plate D has concentric circular grooves for fixing and placing the wooden stick A, the titanium pipe, and the nickel pipe, and the depth of the grooves is 2mm.

3. A large-diameter thin-walled nickel-titanium composite pipe according to claim 1, characterized in that The wooden stick A is a solid wooden stick, and the height of the wooden stick A is 350mm and the diameter is 180mm.

4. A large-diameter thin-walled nickel-titanium composite pipe according to claim 1, characterized in that, The titanium pipe is made of TA1 material, and the height of the titanium pipe is 300mm, the inner diameter is 220mm, and the wall thickness is 3mm.

5. A large-diameter thin-walled nickel-titanium composite pipe according to claim 1, characterized in that, The nickel pipe is made of N02201 material, and the height of the nickel pipe is 300mm, the inner diameter is 230mm, and the wall thickness is 3mm.

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