Device and method for preparing double-layer metal composite pipe

Abstract

The invention discloses a double-layer metal composite pipe preparation device and method, relates to the field of composite metal pipe preparation, and aims to solve the problems that in the prior art, a single-material pipe is difficult to meet the refrigeration and heat exchange requirements in a severe environment, and a composite pipe is high in processing energy consumption and not ideal in composite effect. An alloy outer pipe which is high in strength and corrosion resistance or has other functions and an alloy inner pipe which is good in heat conduction and easy to deform are sleeved after being subjected to surface treatment, compounding is conducted in the mode that the inner layer and the outer layer are spun at the same time, and the outer pipe is spun while being heated. The composite pipe disclosed by the invention can meet the refrigeration and heat exchange requirements in a severe environment; processing is carried out in an internal and external simultaneous reverse spinning mode, subsequent heat treatment is not needed after compounding, the production cost and the process complexity are reduced, driving force can be applied to the inner pipe and the outer pipe, the inner layer and the outer layer are sufficiently deformed, the inner layer and the outer layer are tightly combined, and the stability and the reliability of the pipe are improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite metal pipe preparation, and in particular to a double-layer metal composite pipe preparation device and method. Background Art

[0002] In refrigeration and heat exchange applications in harsh environments, the requirements for pipes are extremely high. Good thermal conductivity is required to ensure heat exchange efficiency, and high strength and high corrosion resistance are required to adapt to harsh working conditions. It is difficult for current single-material pipes to meet these requirements at the same time. In order to solve this problem, composite pipes with inner and outer layers of heterogeneous materials are often used. The outer layer has good corrosion resistance and strength, and the inner layer has good thermal conductivity. Liquid is passed through the inside to achieve rapid heat exchange.

[0003] In the existing composite pipe preparation process, the commonly used methods are drawing, rolling, spinning, hot extrusion, etc. Among them, the drawing method has a low bonding degree, the rolling method requires the tube to be expanded first and the product is prone to cracking, and the spinning method has a small driving force, resulting in small deformation and poor composite degree. The hot extrusion method has a complex process and high cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a double-layer metal composite pipe preparation device and method, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention discloses a double-layer metal composite pipe preparation device, which adopts the technical scheme of comprising an external spinning mechanism, which is a ball spinning mechanism; and an internal rotating mechanism, which comprises a motor, the output end of the motor is connected to a rotating shaft, a roller bracket is connected to the rotating shaft, and a plurality of inner rollers are connected to the upper shaft of the roller bracket, and the inner roller comprises a first rolling section and a second rolling section, both of which are cylindrical, and the end faces are connected by a transition section, the first rolling section and the second rolling section are coaxially arranged and parallel to the rotating shaft, and the diameter of the second rolling section is greater than the diameter of the first rolling section; the external spinning mechanism and the internal rotating mechanism are coaxial, and the outer ball of the external spinning mechanism corresponds to the position of the transition section. The free rotation of the inner roller can reduce the force generated by hard contact on the pipe than the existing ordinary internal spinning, reduce the friction between the inner layer mold and the pipe, and reduce the damage to the internal quality of the pipe.

[0006] The present invention also discloses a preparation method based on the above preparation device, and the technical solution adopted is comprising the following steps:

[0007] Step 1, surface treatment is performed on the alloy outer tube with high strength, high corrosion resistance or other functions and the alloy inner tube with good thermal conductivity and easy deformation, and the surface oxide layer, stains and burrs are removed. The surface is cleaned and set aside to prevent stains and rust on the surface of the pipe from having a negative impact on the bonding of the composite surface. The length of the outer tube is longer than that of the inner tube;

[0008] Step 2, sleeve the outer tube onto the inner tube with the transition layer;

[0009] Step 3, heating the outer tube, and simultaneously using the outer spinning mechanism and the inner rotating mechanism to spin the outer side of the outer tube and the inner side of the inner tube; the simultaneous spinning of the inner and outer tubes can subject both the inner and outer sides to greater pressure, thereby ensuring that the materials of the inner and outer layers can deform to the required degree of composite, thereby improving the composite strength of the inner and outer tubes;

[0010] Step 4, after the metal composite tube is formed, the end is trimmed. Since the deformation of the inner tube is greater than that of the outer tube, the elongation is greater. After the composite tube is formed, the ends of the inner and outer tubes tend to be flat.

[0011] As a preferred technical solution of the present invention, the outer spinning mechanism spins in a counterclockwise direction, and the inner spinning mechanism spins in a clockwise direction. Spinning in opposite directions can make the transition layer diffuse more fully to the inner and outer tubes.

[0012] As a preferred technical solution of the present invention, the rotation speed of the external spinning mechanism is 20,000-50,000 rpm.

[0013] As a preferred technical solution of the present invention, the rotation speed of the internal rotating mechanism is 500-5000 rpm.

[0014] As a preferred technical solution of the present invention, in step 3, the outer tube is heated by electromagnetic induction heating, and the heating temperature is 0.2-0.5Tm, where Tm is the melting point of the outer tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention combines the comprehensive advantages of high strength, corrosion resistance, good thermal conductivity and easy deformation by compounding an alloy outer tube with high strength, high corrosion resistance or other functions with an alloy inner tube with good thermal conductivity and easy deformation, thereby meeting the refrigeration and heat exchange needs in harsh environments; and by processing by simultaneous reverse spinning of the inside and outside, no subsequent heat treatment is required after compounding, thereby reducing production costs and process complexity, and being able to apply driving force to both the inner and outer tubes, so that both the inside and outside undergo sufficient deformation, so that the inner and outer layers are tightly combined, thereby improving the stability and reliability of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the cross-sectional structure of the double-layer metal composite pipe preparation device of the present invention;

[0017] Figure 2 This is a schematic diagram of the process of preparing a composite pipe using a double-layer metal composite pipe preparation device according to the present invention;

[0018] Figure 3 It is a schematic diagram of the internal rotating mechanism structure of the double-layer metal composite pipe preparation device of the present invention.

[0019] In the figure: 1. outer tube; 2. inner tube; 3. outer ball bracket; 4. outer ball; 5. inner roller; 6. roller bracket; 7. hinge shaft; 8. induction coil; 9. rotating shaft; 10. motor. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1

[0022] The present embodiment first discloses a double-layer metal composite pipe preparation device, the technical scheme adopted is, including an external spinning mechanism, the external spinning mechanism is a ball spinning mechanism, including an external ball bracket 3, the external ball bracket 3 is a tubular mechanism, the inner ring surface of which has a nesting groove for the outer ball 4, the outer ball 4 is nested in the nesting groove, the outer ball 4 can rotate in the nesting groove, and the nesting groove half-covers the outer ball 4; it also includes an internal rotating mechanism, the internal rotating mechanism includes a motor 10, the output end of the motor 10 is connected to a rotating shaft 9, the rotating shaft 9 is connected to a roller bracket 6, the roller bracket 6 is an annular plate, and a roller bracket 6 is installed on its end surface Four articulated shafts 7 are arranged in an annular array, and an inner roller 5 is connected to the upper axis of each articulated shaft 7. The inner roller 5 includes a first rolling section and a second rolling section, both of which are cylindrical, and the end faces are connected through a transition section. The first rolling section and the second rolling section are coaxially arranged and parallel to the rotating shaft 9. The diameter of the second rolling section is larger than the diameter of the first rolling section. The external spinning mechanism and the internal rotating mechanism are coaxial, the inner roller 7 is not in direct contact with the rotating shaft 9, the inner roller 7 can rotate freely, and the outer ball 4 of the external spinning mechanism corresponds to the position of the transition section. The composite deformation process of the composite tube occurs between the outer ball 4 and the transition section. Figure 2 shown.

[0023] This embodiment also discloses a preparation method based on the above-mentioned double-layer metal composite pipe preparation device, and the technical solution adopted is to include the following steps:

[0024] Step 1, surface treatment is performed on the TC2 titanium alloy outer tube and the T1 copper inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0025] Step 2, putting the outer tube on the inner tube with the transition layer;

[0026] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 300°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The speed of the outer layer ball spinning is 30,000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its speed is 2,000 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0027] Step 4: After the metal composite tube is formed, the end is trimmed.

[0028] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0029] Outer material TC2 Titanium Alloy Outer layer specifications (mm) 9*0.15 Outer layer thermal conductivity (W / mK) 15.24 Inner material T1 Copper Inner layer specifications (mm) 8.65*0.35 Inner layer thermal conductivity (W / mK) 390 Composite pipe specifications 8.9*0.45 Thermal conductivity of composite pipe (W / mK) 92

[0030] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is titanium alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0031] Example 2

[0032] This embodiment discloses a second implementation of the present invention, and the technical solution adopted is to include the following steps:

[0033] Step 1, surface treatment is performed on the 304 stainless steel alloy outer tube and the TP2 copper inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0034] Step 2, putting the outer tube on the inner tube with the transition layer;

[0035] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 500°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The speed of the outer layer ball spinning is 50,000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its speed is 5,000 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0036] Step 4: After the metal composite tube is formed, the end is trimmed.

[0037] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0038] Outer material 304 Stainless Steel Alloy Outer layer specifications (mm) 10*0.15 Outer layer thermal conductivity (W / mK) 16 Inner material TP2 Copper Inner layer specifications (mm) 9.68*0.5 Inner layer thermal conductivity (W / mK) 380 Composite pipe specifications 9.8*0.55 Thermal conductivity of composite pipe (W / mK) 74

[0039] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is stainless steel alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0040] Example 3

[0041] This embodiment discloses a third implementation mode of the present invention, and the technical solution adopted is to include the following steps:

[0042] Step 1, surface treatment is performed on the B10 nickel-nickel alloy outer tube and the T2 copper inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0043] Step 2, putting the outer tube on the inner tube with the transition layer;

[0044] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 450°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The rotation speed of the outer layer ball spinning is 20,000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its rotation speed is 500 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0045] Step 4: After the metal composite tube is formed, the end is trimmed.

[0046] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0047] Outer material B10 Nickel Silver Alloy Outer layer specifications (mm) 18*0.2 Outer layer thermal conductivity (W / mK) 46 Inner material T2 Copper Inner layer specifications (mm) 17.6*0.5 Inner layer thermal conductivity (W / mK) 390 Composite pipe specifications 17.8*0.6 Thermal conductivity of composite pipe (W / mK) 120

[0048] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is white copper alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0049] Example 4

[0050] This embodiment discloses a fourth implementation mode of the present invention, and the adopted technical solution includes the following steps:

[0051] Step 1, surface treatment is performed on the TC2 titanium alloy outer tube and the 3003 aluminum inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0052] Step 2, putting the outer tube on the inner tube with the transition layer;

[0053] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 300°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The speed of the outer layer ball spinning is 25000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its speed is 1500 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0054] Step 4: After the metal composite tube is formed, the end is trimmed.

[0055] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0056] Outer material TC2 Titanium Alloy Outer layer specifications (mm) 9*0.15 Outer layer thermal conductivity (W / mK) 15.24 Inner material 3003 Aluminum Tube Inner layer specifications (mm) 8.65*0.35 Inner layer thermal conductivity (W / mK) 210 Composite pipe specifications 8.9*0.45 Thermal conductivity of composite pipe (W / mK) 59

[0057] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is titanium alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0058] Example 5

[0059] This embodiment discloses a fifth implementation of the present invention, and the adopted technical solution includes the following steps:

[0060] Step 1, surface treatment is performed on the 316 stainless steel outer tube and the 6061 aluminum inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0061] Step 2, putting the outer tube on the inner tube with the transition layer;

[0062] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 350°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The speed of the outer layer ball spinning is 28000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its speed is 4500 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0063] Step 4: After the metal composite tube is formed, the end is trimmed.

[0064] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0065] Outer material 316 Stainless Steel Alloy Outer layer specifications (mm) 10*0.15 Outer layer thermal conductivity (W / mK) 16 Inner material 6061 Aluminum Alloy Inner layer specifications (mm) 9.68*0.5 Inner layer thermal conductivity (W / mK) 167 Composite pipe specifications 9.8*0.55 Thermal conductivity of composite pipe (W / mK) 61

[0066] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is stainless steel alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0067] Example 6

[0068] This embodiment discloses a sixth implementation of the present invention, and the adopted technical solution includes the following steps:

[0069] Step 1, surface treatment is performed on the B10 nickel-nickel alloy outer tube and the 3003 aluminum inner tube to remove the surface oxide layer, stains and burrs, and the outer tube is longer than the inner tube after being cleaned;

[0070] Step 2, putting the outer tube on the inner tube with the transition layer;

[0071] Step 3, induction heating is performed on the outer wall of the outer tube to make the temperature of the outer wall of the outer tube reach 420°C, and the outer wall of the outer tube and the inner wall of the inner tube are simultaneously spun from both inside and outside using a ball spinning device and an internal rotating mechanism. The rotation speed of the outer layer ball spinning is 40,000 rpm, and the inner layer rotating device is an actively rotatable core head driven by a motor, and its rotation speed is 3,100 rpm; and the spinning direction of the ball spinning device is counterclockwise spinning, while the spinning direction of the internal rotating mechanism is clockwise spinning;

[0072] Step 4: After the metal composite tube is formed, the end is trimmed.

[0073] The inner tube, outer tube and prepared composite tube were measured for external dimensions and tested for thermal conductivity. The test results are as follows:

[0074] Outer material B10 Nickel Silver Alloy Outer layer specifications (mm) 18*0.2 Outer layer thermal conductivity (W / mK) 46 Inner material 3003 Aluminum Inner layer specifications (mm) 17.6*0.5 Inner layer thermal conductivity (W / mK) 200 Composite pipe specifications 17.8*0.6 Thermal conductivity of composite pipe (W / mK) 94

[0075] The test results show that the thermal conductivity of the composite pipe is within a reasonable range and has not dropped significantly, indicating that there is no gap in the middle of the pipe and the pipe is well composited. At the same time, the outer surface of the composite pipe is white copper alloy, which has high strength and corrosion resistance. Under relatively harsh external environment conditions, the composite pipe has good corrosion resistance and can be used for a long time.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer metal composite pipe preparation device, comprising an external spinning mechanism, wherein the external spinning mechanism is a ball spinning mechanism; characterized in that: It also comprises an internal rotating mechanism, the internal rotating mechanism comprising a motor (10), the output end of the motor (10) being connected to a rotating shaft (9), the rotating shaft (9) being connected to a roller bracket (6), the upper axis of the roller bracket (6) being connected to a plurality of inner rollers (5), the inner rollers (5) comprising a first rolling section and a second rolling section, both of which are cylindrical and whose end faces are connected via a transition section, the first rolling section and the second rolling section being coaxially arranged and parallel to the rotating shaft (9), and the diameter of the second rolling section being greater than the diameter of the first rolling section.

2. A method for preparing a double-layer metal composite pipe based on the double-layer metal composite pipe preparation device according to claim 1, characterized in that: The following steps are involved: Step 1, surface treatment is performed on the alloy outer tube with high strength, high corrosion resistance or other functions and the alloy inner tube with good thermal conductivity and easy deformation, and the surface oxide layer, stains and burrs are removed, and the outer tube is longer than the inner tube after being brushed clean. Step 2, sleeve the outer tube onto the inner tube with the transition layer; Step 3, heating the outer tube, and simultaneously using the outer spinning mechanism and the inner spinning mechanism to spin the outer side of the outer tube and the inner side of the inner tube; Step 4, after the metal composite tube is formed, the end is trimmed. Since the deformation of the inner tube is greater than that of the outer tube, the elongation is greater, and the length difference between the inner and outer tubes becomes smaller after the composite tube is formed.

3. The method for preparing a double-layer metal composite pipe according to claim 2, characterized in that: The spinning direction of the outer spinning mechanism is counterclockwise, and the spinning direction of the inner spinning mechanism is clockwise.

4. The method for preparing a double-layer metal composite pipe according to claim 3, characterized in that: The rotation speed of the external spinning mechanism is 20000-50000 rpm.

5. The method for preparing a double-layer metal composite pipe according to claim 3, characterized in that: The rotation speed of the internal rotating mechanism is 500-5000 rpm.

6. The method for preparing a double-layer metal composite pipe according to claim 2 or 3, characterized in that: In the step 3, the outer tube is heated by electromagnetic induction heating, and the heating temperature is 0.2-0.5Tm, where Tm is the melting point of the outer tube.

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