Induction thermocompression welding equipment for aluminum-clad steel wire

Abstract

The utility model belongs to the technical field of welding equipment, and discloses induction thermocompression welding equipment for aluminum-clad steel wires, which comprises an induction coil, the induction coil is of a copper hollow structure, the inner diameter of the induction coil is 20-100mm, and the induction coil surrounds the outside of a welding area; the fixing mechanism comprises a welding clamp, the welding clamp comprises a left die and a right die which are symmetrically arranged, and the left die and the right die clamp the two ends of the steel wire correspondingly; the hydraulic device comprises a liquid transmission rod and a hydraulic control unit connected with the liquid transmission rod, and the hydraulic device drives the left mold and the right mold to move through the liquid transmission rod; and the shielding gas supply unit conveys argon to the welding area through the annular nozzle. Through the synergistic effect of segmented current regulation and control and a closed-loop hydraulic mechanism, multi-parameter collaborative optimization of heating temperature, pressure and displacement can be achieved, meanwhile, the problems that heat source control is insufficient and positioning precision is poor can be solved, and welding consistency is improved.

Description

Technical Field

[0001] This utility model relates to the field of welding equipment technology, and in particular to an induction hot pressing welding device for aluminum-clad steel wire. Background Technology

[0002] With the rapid advancement of my country's ultra-high voltage power transmission network construction, the application of aluminum-clad steel wire as a key conductive reinforcement material in power engineering continues to expand. This material, through a cold-working hardening process, forms a composite structure with a high-strength steel wire matrix and an aluminum alloy cladding layer. This structure ensures excellent tensile strength while also meeting conductivity requirements, and has a wide range of applications.

[0003] Aluminum-clad steel wire is an important material in the fields of power transmission and communication. The welding quality of aluminum-clad steel wire directly affects its electrical conductivity and mechanical strength. Traditional welding equipment has the following problems:

[0004] 1) Insufficient heat source control: Conventional induction welding equipment uses solid coils, which have problems such as uneven heating and low thermal efficiency, and lack a multi-stage current regulation mechanism.

[0005] 2) Positioning accuracy defects: Ordinary clamps do not have bevel adjustment function, and cannot be adapted to the precise alignment of steel wires of different diameters;

[0006] 3) Delayed oxidation protection: Immediately stopping the shielding gas after welding can easily cause high-temperature metal oxidation. Therefore, we propose an induction hot pressing welding device for aluminum-clad steel wire. Utility Model Content

[0007] In view of the problems of insufficient heat source control, positioning accuracy defects and delayed oxidation protection in the existing welding equipment, this utility model is proposed.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] An induction hot pressing welding device for aluminum-clad steel wire includes an induction coil, which is a hollow copper structure with an inner diameter of 20-100 mm and is wrapped around the outside of the welding area.

[0010] A fixing mechanism, the fixing mechanism including a welding clamp, the welding clamp being a left mold and a right mold arranged symmetrically, and the left mold and the right mold respectively clamping the two ends of the steel wire;

[0011] A hydraulic device, comprising a liquid transmission rod and a hydraulic control unit connected to the liquid transmission rod, wherein the hydraulic device drives the left mold and the right mold to move via the liquid transmission rod;

[0012] A protective gas supply unit supplies argon gas to the welding area through an annular nozzle.

[0013] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the induction coil is electrically connected to an external high-frequency power supply, and the induction coil can be set to 800-1000A / 10-20s for the heating stage and 800-1000A / 20-30s for the heat preservation stage through the power control module.

[0014] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the inner side of the fixing mechanism is provided with a V-shaped bevel positioning groove, and the bevel length ratio L / D of the V-shaped bevel positioning groove is adjustable from 1 to 6.

[0015] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the left mold and the right mold form through holes with an inner diameter of 2.5-4.0mm.

[0016] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the welding fixture is made of nickel-based high-temperature alloy, and the clamping surface of the welding fixture is covered with a ceramic heat insulation layer, and the thickness of the ceramic heat insulation layer is 0.5-1.2mm, and the temperature resistance is ≥1300℃.

[0017] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the liquid transmission rod is equipped with a pressure sensor and a displacement feedback device, and the pressure sensor and the displacement feedback device form a closed-loop control mechanism with the hydraulic control unit.

[0018] As a technical solution of the induction hot pressing welding equipment for aluminum-clad steel wire described in this utility model, the protective gas supply unit can continuously supply gas for 5-15 seconds after welding is completed through a delay controller.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] 1. This utility model, through the synergistic effect of segmented current regulation and closed-loop hydraulic mechanism, can achieve multi-parameter synergistic optimization of heating temperature, pressure and displacement, and at the same time solve the problems of insufficient heat source control and positioning accuracy defects, thereby improving welding consistency.

[0021] 2. This utility model, by adopting a design of real-time argon gas protection and delayed gas supply after welding, forms an inert gas coverage throughout the welding process, which can avoid the decrease in conductivity caused by high-temperature oxidation of the aluminum layer, and at the same time solve the problem of delayed oxidation protection, protect the high-temperature weld seam from slow cooling, and prevent secondary oxidation.

[0022] 3. This utility model, by adopting a V-shaped bevel adjustable clamp to adapt to multiple specifications of steel wire, and combining nickel-based high-temperature alloy and ceramic heat insulation layer to ensure the stability of the equipment under extreme working conditions, significantly expands the application scenarios and service life of the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0024] Figure 1 This is a schematic diagram of the pre-welding preparation process for the steel wire of this utility model.

[0025] Figure 2 This is a schematic diagram of the induction heating and pressure welding structure of this utility model.

[0026] Figure 3 This is a schematic diagram of the welding fixture structure of this utility model.

[0027] Figure 4 This is a schematic diagram of half of the welding fixture of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] In the diagram: 1. Induction coil; 2. Fixing mechanism; 3. Liquid transmission rod; 4. Welding fixture. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] Reference Figures 1-4 An induction thermopress welding device for aluminum-clad steel wire is provided. This induction thermopress welding device for aluminum-clad steel wire includes an induction coil 1, which is a hollow copper structure with an inner diameter of 20-100mm. The induction coil 1 is wrapped around the outside of the welding area to improve thermal efficiency and heating uniformity and avoid the problem of local overheating of traditional solid coils.

[0032] The fixing mechanism 2 includes a welding clamp 4, which consists of a left mold and a right mold arranged symmetrically, and the left mold and the right mold respectively clamp the two ends of the steel wire;

[0033] The hydraulic device includes a liquid transmission rod 3 and a hydraulic control unit connected to the liquid transmission rod 3. The hydraulic device drives the left and right molds to move through the liquid transmission rod 3. In application, the symmetrical welding fixture 4 cooperates with the hydraulic drive to ensure that the two ends of the steel wire are synchronously and accurately aligned, reducing the risk of welding misalignment.

[0034] The protective gas supply unit delivers argon gas to the welding area through an annular nozzle to suppress oxidation in the welding area in real time and ensure the purity of the interface.

[0035] Reference Figure 2 The induction coil 1 is electrically connected to an external high-frequency power supply. The induction coil 1 can be set to 800-1000A / 10-20s for the heating stage and 800-1000A / 20-30s for the heat preservation stage through the power control module. In application, the heating / heat preservation dual-stage regulation (800-1000A adjustable) solves the problem of insufficient heat source control in traditional equipment. At the same time, precise temperature control avoids over-melting or under-melting of the aluminum layer, thus improving the bonding strength.

[0036] Reference Figure 2 The inner side of the fixing mechanism 2 is provided with a V-shaped bevel positioning groove. The bevel length ratio L / D of the V-shaped bevel positioning groove is adjustable from 1 to 6. In application, the bevel length ratio L / D is adjustable from 1 to 6 to adapt to steel wires of different diameters (such as Φ2.5-4mm), achieve precise centering, and overcome the positioning defects of ordinary clamps.

[0037] Reference Figure 2 and Figure 3 The left and right molds form through holes with an inner diameter of 2.5-4.0 mm to improve the practicality of the welding fixture 4.

[0038] Reference Figure 2 and Figure 3 The welding fixture 4 is made of nickel-based high-temperature alloy, and the clamping surface of the welding fixture 4 is covered with a ceramic heat insulation layer with a thickness of 0.5-1.2mm and a temperature resistance of ≥1300℃. In application, the ceramic heat insulation layer with a temperature resistance of ≥1300℃ blocks the conduction of induced heat to the welding fixture 4, avoids high-temperature deformation, and extends the service life of the equipment.

[0039] Reference Figure 2 The hydraulic transmission rod 3 is equipped with a pressure sensor and a displacement feedback device, and the pressure sensor and displacement feedback device form a closed-loop control mechanism with the hydraulic control unit. In application, the cooperation of the pressure sensor and displacement feedback device can dynamically adjust the pressing force and displacement to ensure stable pressure during the welding process and reduce the risk of incomplete welding / overpressure.

[0040] Reference Figure 2The protective gas supply unit can continuously supply gas for 5-15 seconds after welding by means of a delay controller. In application, continuous gas supply for 5-15 seconds after welding is used to solve the problem of delayed oxidation protection, protect the high-temperature weld seam from slow cooling, and prevent secondary oxidation.

[0041] The working principle of this utility model is as follows: Pre-treatment and clamping:

[0042] Steel wire end treatment: cut the aluminum cladding to expose the steel core, and grind the end face flat;

[0043] Fixture adjustment: Set the V-groove L / D = 3 according to the wire diameter (e.g., Φ3mm) to ensure centering accuracy ≤0.05mm;

[0044] Clamping and fixing: Insert both ends of the steel wire into the left / right mold through holes (Φ3.5mm) respectively, close the welding fixture 4 and pre-tighten (5MPa initial pressure);

[0045] Heating stage: Start the high-frequency power supply and load the heating current according to the preset parameters (e.g., 1000A / 15s). The induction coil 1 generates eddy currents to heat the aluminum cladding to 500-550℃ (near the melting point of aluminum). The argon nozzle is turned on simultaneously with a flow rate of 12L / min to cover the welding area and isolate oxygen.

[0046] Pressure welding: When the temperature reaches the set value, the hydraulic device drives the liquid transmission rod 3 to pressurize to 20MPa, dynamically close the displacement (to compensate for thermal expansion), switch to the heat preservation current (800A / 25s), maintain the plastic flow of the aluminum layer, and realize the metallurgical bonding of the steel core and aluminum layer interface.

[0047] Pressure holding and cooling: After heating is stopped, maintain the pressure for 10 seconds, and supply argon gas for 10 seconds until the weld temperature drops below 200°C. At the same time, the hydraulic device is depressurized, and the welding fixture 4 is released to remove the weldment.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An induction heat pressure welding apparatus for aluminum clad steel wire, characterized by: include: Induction coil (1), the induction coil (1) is a hollow copper structure, the inner diameter of the induction coil (1) is 20-100mm, and it is wrapped around the outside of the welding area; The fixing mechanism (2) includes a welding clamp (4), which consists of a left mold and a right mold arranged symmetrically, and the left mold and the right mold respectively clamp the two ends of the steel wire; A hydraulic device, comprising a liquid transmission rod (3) and a hydraulic control unit connected to the liquid transmission rod (3), wherein the hydraulic device drives the left mold and the right mold to move via the liquid transmission rod (3); A protective gas supply unit supplies argon gas to the welding area through an annular nozzle.

2. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The induction coil (1) is electrically connected to an external high-frequency power supply. The induction coil (1) can be set to 800-1000A / 10-20s for the heating stage and 800-1000A / 20-30s for the heat preservation stage through the power control module.

3. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The inner side of the fixing mechanism (2) is provided with a V-shaped bevel positioning groove, and the bevel length ratio L / D of the V-shaped bevel positioning groove is adjustable from 1 to 6.

4. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The left mold and the right mold form a through hole with an inner diameter of 2.5-4.0 mm.

5. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The welding fixture (4) is made of nickel-based high-temperature alloy, and the clamping surface of the welding fixture (4) is covered with a ceramic heat insulation layer, and the thickness of the ceramic heat insulation layer is 0.5-1.2mm, and the temperature resistance is ≥1300℃.

6. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The liquid transmission rod (3) is equipped with a pressure sensor and a displacement feedback device, and the pressure sensor and the displacement feedback device form a closed-loop control mechanism with the hydraulic control unit.

7. The induction heat pressure bonding apparatus for aluminum clad steel wire according to claim 1, characterized by: The protective gas supply unit can continuously supply gas for 5-15 seconds after welding is completed via a delay controller.

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