Preparation device and preparation method of copper-steel bimetal pipe

Abstract

The invention discloses a preparation device and a preparation method of a copper-steel bimetal pipe, and the preparation device of the copper-steel bimetal pipe is a medium-high frequency rotary heating device and comprises a horizontal rack, a rotary driving unit, a front end axial driving unit and a medium-high frequency heating unit; the preparation method comprises the following steps: 1) preparing the bimetallic assembly pipe; (2) heating and melting the bimetallic assembly pipe; the bimetal assembly pipe is horizontally arranged on medium-high frequency rotary heating equipment, the bimetal assembly pipe rotates and axially moves relative to the heating coil under the driving of the driving unit, and the heating coil locally heats the bimetal assembly pipe, so that a copper pipe in the bimetal assembly pipe is locally molten into liquid, and a steel pipe outside the bimetal assembly pipe is not molten; the locally molten copper pipe is molten on the inner wall of the steel pipe; the bimetal assembly pipe completely penetrates through the heating coil, and the copper pipe in the whole bimetal assembly pipe is melted and injected on the inner wall of the steel pipe. According to the method, the copper-steel bimetal pipe can be efficiently prepared at low cost, and the copper and the steel of the prepared metal pipe have high binding force.

Description

Technical Field

[0001] The invention belongs to the field of bimetallic composite pipes, in particular to a preparation device and a preparation method for a copper-steel bimetallic pipe. Background Art

[0002] Copper has physical and chemical properties such as wear resistance, corrosion resistance, excellent thermal conductivity and ductility; steel has excellent mechanical properties, and its mechanical strength is 3 to 6 times that of copper, and the price of steel is low, which is one tenth of the price of copper. The copper-steel bimetallic tube, which uses copper and steel inside and outside respectively, not only maintains the wear resistance and corrosion resistance of copper tubes, but also has better mechanical strength than copper tubes, and is particularly suitable for heavy-load working environments. The material price of copper-steel bimetallic tubes is one-third to one-fifth of that of copper tubes, and can be widely used in sliding bearings, various hardware and mold parts.

[0003] At present, copper-steel bimetallic pipes generally adopt a vertical casting method. Copper is first melted into liquid, the axis of the steel sleeve is perpendicular to the horizontal plane and rotates, and then the melted copper water is poured into the steel sleeve, and the copper water and the steel sleeve rotate together. Due to the effect of centrifugal force, the copper water adheres to the inner wall of the steel sleeve. As the temperature drops, the copper water solidifies to form a copper-steel bimetallic sleeve. In the above-mentioned vertical casting method, the length of the copper-steel bimetallic pipe is limited by the process, and only the copper-steel bimetallic sleeve can be produced, which is inefficient, the copper material loss is serious, and the production cost is high. And the copper inner tube thickness of the prepared copper-steel bimetallic pipe is uneven. In addition, since the thermal expansion coefficient of copper is much greater than that of steel, when the temperature drops, the copper sleeve inside the copper-steel bimetallic sleeve shrinks more relative to the external steel sleeve, which reduces the bonding force between the copper sleeve and the steel sleeve. Under heavy load working environment, the copper sleeve and the steel sleeve are prone to internal and external detachment, resulting in failure of the parts.

[0004] Therefore, the efficient and low-cost preparation of copper-steel bimetallic tubes with excellent bonding strength between copper and steel is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a copper-steel bimetallic tube preparation device and preparation method, which can prepare the copper-steel bimetallic tube efficiently and at low cost, and the prepared copper-steel bimetallic tube has high bonding strength between copper and steel.

[0006] To achieve the above objectives, the present invention provides a preparation device for a copper-steel bimetallic tube, wherein the preparation device for the copper-steel bimetallic tube is a medium-high frequency rotary heating device, comprising a horizontal frame, a rotary drive unit, a front end axial drive unit and a medium-high frequency heating unit; the medium-high frequency heating unit comprises a heating coil, a temperature sensor and a heating control cabinet; the operating frequency of the medium-high frequency heating unit is between 500Hz and 200KHz; the rotary drive unit comprises a rotary drive component, a connecting rod and a front end clamping component; the front end axial drive unit comprises an axial drive component and an axial motion unit.

[0007] Furthermore, the medium and high frequency rotary heating device is provided with a metal tube support, and the bimetallic assembly tube is horizontally placed on the metal tube support.

[0008] Furthermore, the medium and high frequency rotary heating device is also provided with a rear end clamping component, and the two ends of the bimetallic assembly tube are horizontally clamped between the front end clamping component and the rear end clamping component.

[0009] Furthermore, the rotary drive component and the axial drive component are both selected from one of a drive motor, a drive cylinder, and a drive hydraulic cylinder.

[0010] The present invention also provides a method for preparing a copper-steel bimetallic tube according to the above-mentioned copper-steel bimetallic tube preparation device, comprising the following steps:

[0011] Step S1, preparation of bimetallic assembly tube:

[0012] Prepare a copper tube and a steel tube, wherein the inner diameter of the steel tube is 0.02 mm to 1 mm larger than the outer diameter of the copper tube, and assemble the copper tube into the steel tube to form a bimetallic assembled tube;

[0013] Step S2, heating and melting of the bimetallic assembly tube:

[0014] The bimetallic assembly tube is horizontally placed on the medium and high frequency rotary heating device. Driven by the rotary drive unit and the axial drive unit, the bimetallic assembly tube rotates and moves axially relative to the heating coil and passes through the heating coil. The heating coil locally heats the bimetallic assembly tube at a local heating temperature of 900° to 1300°, so that the copper tube inside the bimetallic assembly tube is partially melted into liquid, while the external steel tube is not melted; the partially melted copper tube is melted into the inner wall of the steel tube; the bimetallic assembly tube completely passes through the heating coil, and the copper tube inside the entire bimetallic assembly tube is melted into the inner wall of the steel tube.

[0015] Furthermore, the material of the steel pipe is carbon steel or alloy steel; the material of the copper pipe is selected from one of brass, tin bronze and red copper.

[0016] Furthermore, the steel pipe is an integral steel pipe with a length of 200 to 2000 mm; the copper pipe is an integral copper pipe, or is composed of a plurality of short copper pipes assembled in a steel pipe.

[0017] Furthermore, radial grooves are arranged on the inner circular wall surface of the steel pipe, or radial grooves and axial grooves are arranged on the inner circular wall surface of the steel pipe at the same time.

[0018] Furthermore, the radial grooves and the axial grooves have a width of 0.1 mm to 1.0 mm and a depth of 0.1 mm to 1.0 mm.

[0019] Furthermore, the groove top width of the radial groove and the axial groove is 0.02 mm to 0.5 mm smaller than the groove bottom width.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are:

[0021] 1. Under the local heating of the heating coil, the copper tube inside the bimetallic assembly tube is partially melted into liquid, while the steel tube outside is not melted. The partially melted copper tube is injected into the inner wall of the steel tube, so that the copper-steel bimetallic tube can be prepared efficiently and at low cost. The radial grooves set on the inner wall of the steel tube make the contact surface between copper and steel have high bonding strength.

[0022] 2. Place the bimetallic assembly tube horizontally on the medium and high frequency rotary heating equipment. Driven by the rotary drive unit and the axial drive unit, the bimetallic assembly tube rotates and moves axially relative to the heating coil, passing through the heating coil. This processing technology can realize the processing of large-sized bimetallic assembly tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of radial grooves provided on the inner wall of a bimetallic assembly tube and a steel tube;

[0025] Figure 3 is a schematic structural diagram of a second embodiment of the present invention;

[0026] Reference numerals:

[0027] Attached Figure 1 Markings: horizontal frame 1, metal pipe support 2, bimetallic assembly pipe 3, medium and high frequency heating unit 4, heating coil 41, temperature sensor 42, heating control cabinet 43, front end axial drive unit 5, front end axial drive motor 51, front end axial motion unit 52, rotary drive unit 6, rotary unit mounting base plate 61, rotary drive motor 62, connecting rod 63, front end clamping component 64;

[0028] Attached Figure 2 Markings: bimetallic assembly tube 3, copper tube 31, steel tube 32, radial groove 321, groove top width 321a, groove bottom width 321b, groove depth 321c;

[0029] Attached Figure 3 Markings: horizontal frame 1, bimetallic assembly tube 3, motor medium and high frequency heating unit 4, heating coil 41, temperature sensor 42, heating control cabinet 43, axial drive unit 5, axial drive motor 51, axial motion unit 52, rotary drive unit 6, rotary unit mounting base plate 61, rotary drive motor 62, connecting rod 63, front end clamping component 64, rear end axial moving unit 7, rear end axial motion unit 71, rear end clamping component 72. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] The technical solution of the present invention is further explained below in conjunction with implementation cases.

[0032] Example 1

[0033] Figure 1 The structural schematic diagram of the first embodiment provided by the present invention is that the preparation device of the copper-steel bimetallic tube is provided with a metal tube support, and the preparation device of the copper-steel bimetallic tube is a medium-high frequency rotary heating device, and the medium-high frequency rotary heating device includes a horizontal frame 1, a metal tube support 2, a medium-high frequency heating unit 4, a front end axial drive unit 5 and a rotary drive unit 6. The medium-high frequency heating unit 4 mainly includes a heating coil 41, a temperature sensor 42 and a heating control cabinet 43. The front end axial drive unit 5 includes a front end axial drive motor 51 and a front end axial motion unit 52; the rotary drive unit 6 includes a rotary unit mounting base plate 61, a rotary drive motor 62, a connecting rod 63 and a front end clamping component 64. The front end axial drive motor 51 can be replaced by a pneumatic or hydraulic drive; the rotary drive motor 62 can also be replaced by a pneumatic or hydraulic drive.

[0034] The horizontal frame 1 is provided with the metal pipe supports 2 , and the metal pipe supports 2 are generally provided in 2 to 5 numbers; the bimetallic assembly pipe 3 is horizontally placed on the metal pipe supports 2 .

[0035] Figure 2It is a structural cross-sectional view of a bimetallic assembly tube. The interior of the metal assembly tube 3 is a copper tube 31, and the exterior is a steel tube 32. The inner diameter of the steel tube 32 is slightly larger than the outer diameter of the copper tube 31. The inner diameter of the steel tube is 0.05mm to 0.5mm larger than the outer diameter of the copper tube. The gap is 0.05mm to 0.5mm. On the one hand, it is easy to assemble the copper tube 31 into the steel tube 32. On the other hand, it ensures that the steel tube 32 can drive the copper tube 31 to move together without loosening.

[0036] Under the drive of the front axial drive unit 5 and the rotary drive unit 6, the front clamping component 64 clamps the front end of the metal assembly tube 3, driving the metal assembly tube 3 to move forward axially and rotate at the same time, passing through the heating coil 41. Under the feedback control of the temperature sensor 42 and the heating control cabinet 43, the heating coil 41 locally heats the bimetallic assembly tube 3, and the local heating temperature is between 900° and 1300°, so that the copper tube 31 inside the bimetallic assembly tube 3 partially melts into liquid, while the external steel tube 32 does not melt; the partially melted copper tube 31 is melted into the inner wall of the steel tube 32; the bimetallic assembly tube 3 completely passes through the heating coil 41, and the copper tube 31 inside the entire bimetallic assembly tube 3 is melted into the inner wall of the steel tube 32. In this embodiment, the axial drive unit 5 and the rotary drive unit 6 are driven by the axial drive motor 51 and the rotary drive motor 62 respectively, and the above motor drive can also be replaced by pneumatic and hydraulic drive.

[0037] The material of the steel pipe 32 is carbon steel or alloy steel; the material of the copper pipe 31 is brass, tin bronze or copper. The steel pipe is generally an integral steel pipe with a length of 200 mm to 2000 mm; the copper pipe is an integral copper pipe or is composed of multiple short copper pipes assembled in a steel pipe. The medium and high frequency heating unit 4 has an operating frequency of 500 Hz to 200 KHz. Generally speaking, the thickness of the metal assembly pipe 3 increases, and the operating frequency is reduced.

[0038] Figure 2The cross-sectional view of the radial grooves provided on the inner circular wall of the steel tube 32 is shown. Since the thermal expansion coefficient of copper is much greater than that of steel, when the temperature drops, the copper tube 31 shrinks more relative to the steel tube 32, and the bonding force between the copper tube 31 and the steel tube 32 decreases. To this end, a radial groove 321 is provided on the inner circular wall of the steel tube 32, and the radial groove 321 can be processed by boring, turning or forming tools. The inner circular wall of the steel tube 32 can also be provided with axial grooves at the same time; the radial grooves and axial grooves have a groove width of 0.1mm to 1.0mm and a groove depth of 0.1mm to 1.0mm. In this embodiment, the groove top width 321a is 0.1mm to 0.3mm smaller than the groove bottom width 321b, which better improves the bonding force of the copper and steel contact surfaces.

[0039] Example 2

[0040] Figure 3 This is a structural schematic diagram of the second embodiment of the present invention, in which the copper-steel bimetallic tube preparation device is provided with a rear end axial moving unit. The copper-steel bimetallic tube preparation device is a medium-high frequency rotary heating device, and the medium-high frequency rotary heating device is provided with a rear end axial driving unit 7. The rear end axial driving unit 7 includes a rear end axial driving motor 71, a rear end axial motion unit 72 and a rear end clamping component 73. The two ends of the bimetallic assembly tube 3 are horizontally clamped between the front end clamping component 64 and the rear end clamping component 73, the bimetallic assembly tube 3 passes through the heating coil 41, and the copper tube 31 inside the bimetallic assembly tube 3 is melted into the inner wall of the steel tube 32.

[0041] The present invention provides a copper-steel bimetallic pipe preparation device and preparation method, which forms a bimetallic assembly pipe by assembling a copper pipe inside a steel pipe. Under the local heating of a heating coil, the copper pipe inside the bimetallic assembly pipe is partially melted into liquid, while the steel pipe outside is not melted, and the partially melted copper pipe is melted into the inner wall of the steel pipe, so that the copper-steel bimetallic pipe can be prepared efficiently and at low cost. The radial grooves arranged on the inner circular wall surface of the steel pipe make the contact surface between copper and steel have high bonding strength.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A preparation device for a copper-steel bimetallic tube, characterized in that: The preparation device of the copper-steel bimetallic tube is a medium-high frequency rotary heating device, comprising a horizontal frame, a rotary drive unit, a front end axial drive unit and a medium-high frequency heating unit; the medium-high frequency heating unit comprises a heating coil, a temperature sensor and a heating control cabinet; the operating frequency of the medium-high frequency heating unit is between 500Hz and 200KHz; the rotary drive unit comprises a rotary drive component, a connecting rod and a front end clamping component; the front end axial drive unit comprises an axial drive component and an axial motion unit.

2. The copper-steel bimetallic tube manufacturing device according to claim 1, characterized in that: The medium and high frequency rotary heating device is provided with a metal tube support, and the bimetallic assembly tube is horizontally placed on the metal tube support.

3. The copper-steel bimetallic tube manufacturing device according to claim 1, characterized in that: The medium and high frequency rotary heating device is also provided with a rear end clamping component, and the two ends of the bimetallic assembly tube are horizontally clamped between the front end clamping component and the rear end clamping component.

4. The copper-steel bimetallic tube manufacturing device according to claim 1, characterized in that: The rotary drive component and the axial drive component are both selected from one of a drive motor, a drive cylinder, and a drive hydraulic cylinder.

5. The method for preparing a copper-steel bimetallic tube according to the preparation device of the copper-steel bimetallic tube according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step S1, preparation of bimetallic assembly tube: Prepare a copper tube and a steel tube, wherein the inner diameter of the steel tube is 0.02 mm to 1 mm larger than the outer diameter of the copper tube, and assemble the copper tube into the steel tube to form a bimetallic assembled tube; Step S2, heating and melting of the bimetallic assembly tube: The bimetallic assembly tube is horizontally placed on the medium and high frequency rotary heating device. Driven by the rotary drive unit and the axial drive unit, the bimetallic assembly tube rotates and moves axially relative to the heating coil and passes through the heating coil. The heating coil locally heats the bimetallic assembly tube at a local heating temperature of 900° to 1300°, so that the copper tube inside the bimetallic assembly tube is partially melted into liquid, while the external steel tube is not melted; the partially melted copper tube is melted into the inner wall of the steel tube; the bimetallic assembly tube completely passes through the heating coil, and the copper tube inside the entire bimetallic assembly tube is melted into the inner wall of the steel tube.

6. The method for preparing the copper-steel bimetallic tube according to claim 5, characterized in that: The material of the steel pipe is carbon steel or alloy steel; the material of the copper pipe is selected from one of brass, tin bronze and red copper.

7. The method for preparing the copper-steel bimetallic tube according to claim 5, characterized in that: The steel pipe is an integral steel pipe with a length of 200-2000 mm; the copper pipe is an integral copper pipe, or is composed of a plurality of short copper pipes assembled in the steel pipe.

8. The method for preparing the copper-steel bimetallic tube according to any one of claims 6 to 7, characterized in that: The inner circular wall surface of the steel pipe is provided with radial grooves, or the inner circular wall surface of the steel pipe is provided with radial grooves and axial grooves at the same time.

9. The method for preparing the copper-steel bimetallic tube according to claim 8, characterized in that: The radial groove and the axial groove have a width of 0.1 mm to 1.0 mm and a depth of 0.1 mm to 1.0 mm.

10. The method for preparing the copper-steel bimetallic tube according to any one of claims 8 to 9, characterized in that: The groove top width of the radial groove and the axial groove is 0.02mm to 0.5mm smaller than the groove bottom width.

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