Metal wire continuous annealing process and annealing device

Abstract

The invention discloses a metal wire continuous annealing process and an annealing device. The annealing process comprises the following steps: S1, cleaning and shaping a metal wire; s2, water vapor is adopted for preheating the metal wire; s3, the preheated metal wire is subjected to annealing treatment in a high-frequency induction heating mode; s4, mixed gas of water vapor and nitrogen is adopted for conducting primary cooling on the metal wire; s5, the metal wire is cooled again through silicone oil; and S6, the mixed gas of the water vapor and the nitrogen is adopted again to cool the metal wire till the metal wire is cooled to the room temperature. According to the method, the metal wire is preheated through water vapor before high-frequency induction heating annealing, so that the pulse property of high-frequency induction heating can be relieved on the premise of increasing the heating speed, and the risk that the metal wire is burnt out is avoided; in the cooling process, mixed gas of water vapor and nitrogen is adopted for cooling, silicone oil is combined for cooling, the cooling efficiency can be improved, and meanwhile the surface quality of the metal wire is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of metal wire processing, and in particular relates to a metal wire continuous annealing process and an annealing device. Background Art

[0002] Annealing is a metal heat treatment process that slowly heats the metal to a certain temperature, keeps it for a sufficient time, and then cools it at an appropriate rate. The purpose is to reduce hardness, reduce residual stress, stabilize size, refine grains, adjust structure, eliminate structural defects, etc.

[0003] At present, the commonly used annealing devices for metal wires include continuous annealing furnaces, pit furnaces, bell furnaces, etc. Among them, continuous annealing furnaces are widely used in ultra-fine wires because of their relatively uniform heating and cooling. Continuous annealing furnaces usually use electric heating tubes for heating. The electric heating wire is wound on a stainless steel or ceramic tube. The metal wire passes through the tube to be heated, and then enters a non-heating pipe for cooling. At present, the use of continuous annealing furnaces for annealing metal wires still has the following shortcomings: 1) The heating speed of metal wires is slow, the heating pipe is long, and a large workshop area is required. At the same time, the thermal efficiency is low, generally less than 50%, which causes a large amount of heat to spread to the workshop, deteriorating the working environment of the workshop; 2) The current cooling method is mainly to cool with nitrogen in the pipe. Due to the low thermal conductivity of nitrogen at 0.025K / mK, the heat of the metal wire takes a long time to spread to the cooling pipe. For copper-based wires with high surface quality requirements, it needs to reach room temperature before it can contact the air. To meet such requirements, the cooling pipe needs to reach nearly ten meters or even dozens of meters, and the nitrogen consumption is also very large.

[0004] Therefore, rapid heating and efficient cooling are issues that need to be urgently addressed. Rapid heating can be achieved by increasing the temperature of the heating tube, but due to the thermal conductivity of the inert gas, the heating efficiency of the metal wire is still difficult to achieve the ideal. Another way to increase the heating speed is to use high-frequency induction heating, but high-frequency induction heating is pulsed and is particularly prone to burning the metal wire. For efficient cooling, the metal wire can be directly immersed in water or oil. Although it can achieve the effect of rapid cooling, it is easy to cause the surface brittleness of the metal wire, there is a large internal stress, and it is difficult to ensure the surface quality of the metal wire.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a metal wire continuous annealing process and an annealing device, thereby overcoming the defects in the above-mentioned prior art.

[0007] In order to achieve the above object, the present invention provides a metal wire continuous annealing process, comprising the following steps: S1: Cleaning and shaping of metal wires; S2: preheating the metal wire with water vapor; S3: The preheated metal wire is annealed by high frequency induction heating; S4: Preliminary cooling of the metal wire using a mixture of water vapor and nitrogen; S5: Cooling the metal wire again using silicone oil; S6: Cooling the metal wire again with a mixture of water vapor and nitrogen until it cools to room temperature.

[0008] Further, preferably, the volume content of water vapor in the mixed gas of water vapor and nitrogen in S4 is 20-50%.

[0009] Furthermore, preferably, the preliminary cooling in S4 is performed to a temperature of 400±50°C.

[0010] Further, as a preference, in said S6, when the metal wire is cooled to 200±50° C., the metal wire is cooled again with a mixture of water vapor and nitrogen until it is cooled to room temperature.

[0011] Further, preferably, the volume content of water vapor in the mixed gas of water vapor and nitrogen in S6 is 50-80%.

[0012] The present invention also provides a metal wire continuous annealing device, comprising a wire cleaning unit, a wire shaping unit, an annealing unit and a cooling unit arranged in sequence; the annealing unit is provided with a water vapor preheating unit and a high-frequency induction heating unit; the cooling unit is provided with a first cooling section, a second cooling section and a third cooling section; a water vapor channel and a water vapor reflux channel are connected between the water vapor preheating unit, the first cooling section and the third cooling section; the first cooling section and the third cooling section are respectively provided with a nitrogen inlet channel and a nitrogen outlet channel, and the second cooling section is provided with a cooling oil inlet channel and a cooling oil outlet channel.

[0013] Furthermore, preferably, the wire cleaning unit is provided with a plurality of groups of wire clamping devices.

[0014] Further, as a preference, the wire clamping device includes a lower clamping assembly and an upper clamping assembly; the lower clamping assembly includes a lower support rod arranged in the wire cleaning unit and a lower clamping claw arranged on the lower support rod; the upper clamping assembly includes an upper support rod arranged in the wire cleaning unit, a push rod is provided inside the upper support rod, one end of the push rod is provided with an upper clamping claw, and the other end is provided with an adjusting bolt, and the adjusting bolt is screwed on the upper support rod.

[0015] Furthermore, preferably, the lower clamping jaw and the upper clamping jaw are both semicircular structures.

[0016] Furthermore, preferably, the wire shaping unit is provided with an adjustable shaping clamp.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention preheats the metal wire by water vapor before high-frequency induction heating annealing, which can alleviate the pulse of high-frequency induction heating and avoid the risk of the metal wire being burned while increasing the heating speed; The present invention uses a mixture of water vapor and nitrogen for cooling during the cooling process, combined with silicone oil cooling, which can improve the cooling efficiency and ensure the surface quality of the metal wire. The present invention pre-treats and shapes the metal wire before annealing, thereby improving the surface quality of the metal wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a metal wire continuous annealing device of the present invention; Figure 2 It is an enlarged schematic diagram of a wire clamping device of a metal wire continuous annealing device of the present invention; Figure 3 It is an enlarged schematic diagram of a lower clamping assembly of a metal wire continuous annealing device of the present invention; Figure 4 It is an enlarged schematic diagram of an adjustable shaping fixture of a metal wire continuous annealing device of the present invention; Figure 5 It is a schematic diagram of a partial structure enlargement at another angle of an adjustable shaping fixture of a metal wire continuous annealing device of the present invention; Figure 6 It is an enlarged schematic diagram of a traction wheel of a metal wire continuous annealing device of the present invention; Figure numerals: 1-wire cleaning unit, 101-cleaning spray device, 102-cleaning liquid discharge port, 2-wire shaping unit, 21-adjustable shaping fixture, 211-shaping fixture, 212-pushing mechanism, 213-metal wire trough, 3-annealing unit, 31-steam preheating unit, 32-high frequency induction heating unit, 4-cooling unit, 41-first cooling section, 42-second cooling section, 43-third cooling section, 5-steam passage Channel, 6-water vapor reflux channel, 7-nitrogen inlet channel, 8-nitrogen outlet channel, 9-cooling oil inlet channel, 10-cooling oil outlet channel, 11-wire clamping device, 111-lower clamping assembly, 1111-lower support rod, 1112-lower clamping jaw, 112-upper clamping assembly, 1121-upper support rod, 1122-push rod, 1123-upper clamping jaw, 1124-adjusting bolt, 12-traction wheel, 121-metal wire slot. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0020] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0021] In this embodiment, a 2 mm diameter t2 metal copper wire is taken as an example, and a metal wire continuous annealing process includes the following steps: S1: Clean and shape the metal copper wire; S2: Preheat the copper wire by introducing water vapor at 200±50℃; S3: heating and annealing the preheated metal copper wire by high-frequency induction heating, the annealing temperature is 450-800°C, and the annealing time is 3-5h; S4: introducing water vapor and nitrogen at 200±50°C to preliminarily cool the annealed copper wire to 400±50°C, wherein the volume content of water vapor in the mixed gas of water vapor and nitrogen is 35%; S5: Pass silicone oil to perform secondary cooling on the metal copper wire until the metal copper wire is cooled to 200±50°C; S6: introducing water vapor and nitrogen at 200±50°C again to cool the metal copper wire until the metal copper wire cools to room temperature, wherein the volume content of water vapor in the water vapor and nitrogen mixture is 65%.

[0022] After the t2 metal copper wire is treated by the existing common annealing process, the tensile strength is 200-400mPa and the yield strength is 60-150mPa. After the process of the present invention is adopted, the tensile strength and the yield strength can be increased by about 5-10%.

[0023] In another embodiment, taking a 2mm diameter C19400 copper wire as an example, after being treated with the existing common annealing process, the tensile strength is 400-600mPa and the yield strength is 250-400mPa. After using the process of the present invention, the tensile strength and the yield strength can be increased by about 5-10%.

[0024] The present invention can also be used for the annealing process of other metal wires.

[0025] like Figure 1-6 As shown, a metal wire continuous annealing device of the present invention comprises a wire cleaning unit 1, a wire shaping unit 2, an annealing unit 3 and a cooling unit 4 which are arranged in sequence; the annealing unit 3 is provided with a water vapor preheating unit 31 and a high-frequency induction heating unit 32; the cooling unit 4 is provided with a first cooling section 41, a second cooling section 42 and a third cooling section 43; a water vapor channel 5 and a water vapor reflux channel 6 which are connected are provided between the water vapor preheating unit 31, the first cooling section 41 and the third cooling section 43; the first cooling section 41 and the third cooling section 43 are provided with a nitrogen inlet channel 7 and a nitrogen outlet channel 8 respectively, and the second cooling section 42 is provided with a cooling oil inlet channel 9 and a cooling oil outlet channel 10.

[0026] In this embodiment, as a specific solution, a cleaning spray device 101 is provided in the wire cleaning unit 1 , and the wire cleaning unit 1 is also provided with a cleaning liquid discharge port 102 .

[0027] In this embodiment, as a specific solution, a plurality of groups of wire clamping devices 11 are provided in the wire cleaning unit 1 .

[0028] In this embodiment, as a more specific solution, the wire clamping device 11 includes a lower clamping assembly 111 and an upper clamping assembly 112; the lower clamping assembly 111 includes a lower support rod 1111 arranged in the wire cleaning unit 1 and a lower clamping jaw 1112 arranged on the lower support rod 1111; the upper clamping assembly 112 includes an upper support rod 1121 arranged in the wire cleaning unit 1, and a push rod 1122 is provided inside the upper support rod 1121, one end of the push rod 1122 is provided with an upper clamping jaw 1123, and the other end is provided with an adjusting bolt 1124, and the adjusting bolt 1124 is screwed on the upper support rod 1121.

[0029] In this embodiment, as a more specific solution, the lower clamping jaw 1112 and the upper clamping jaw 1123 are both semicircular structures; this structural design can better fit the structure of the wire, and after clamping the metal wire, it can play a certain clamping and shaping role, which can ensure the quality of the wire surface after subsequent processing.

[0030] In this embodiment, as a specific solution, the wire shaping unit 2 is provided with an adjustable shaping fixture 21 .

[0031] In this embodiment, as a more specific solution, the adjustable shaping fixture 21 includes a shaping fixture 211 and a pushing mechanism 212 connected to the shaping fixture 211, wherein the pushing mechanism 212 can adopt a linear cylinder, and the shaping fixture 211 is provided with a metal wire groove 213.

[0032] In this embodiment, as a specific solution, the annealing device is further provided with a plurality of traction wheels 12, and the traction wheels 12 are provided with metal wire clamping grooves 121, which can play a shaping role in the entire annealing process of the metal copper wire and ensure the surface quality of the metal copper wire processing.

[0033] Before the annealing process, the metal copper wire first passes through the wire cleaning unit 1, and the cleaning liquid is sprayed by the cleaning spray device 101 to clean the metal copper wire. The cleaning liquid can be a conventional acidic or alkaline cleaning liquid, and the cleaning liquid is discharged from the cleaning liquid discharge port 102. After the metal copper wire enters the wire cleaning unit 1, it is clamped by the wire clamping device 11 for cleaning. The clamping tightness of the upper clamping jaw 1123 and the lower clamping jaw 1112 can be adjusted according to the thickness of the metal copper wire. During the specific adjustment, the push rod 1122 is adjusted to move up and down through the adjusting bolt 1124, thereby adjusting the height of the upper clamping jaw 1123 to meet the needs of the upper clamping jaw 1123 and the lower clamping jaw 1123 to clamp metal wires of different specifications; The cleaned copper wire enters the wire shaping unit 2 for shaping. During shaping, the copper wire is clamped by an adjustable shaping fixture 21 to achieve the shaping purpose. Specifically, the shaping fixture 211 can be pushed by a pushing mechanism 212 to meet the shaping requirements of metal wires of different specifications. The shaped copper wire enters the annealing unit 3 for annealing. Specifically, it is first preheated by the steam preheating unit 31 and then heated and annealed by the high-frequency induction heating unit 32. This can alleviate the pulse of high-frequency induction heating and avoid the risk of the metal wire being burned. The annealed metal copper wire enters the cooling unit 4 for cooling. During the initial cooling, water vapor and nitrogen at 200±50°C are introduced into the first cooling section 41 for initial cooling, and the metal copper wire is cooled to 400±50°C, wherein the volume content of water vapor in the water vapor and nitrogen mixture is 35%; then silicone oil is introduced into the second cooling section 42 for secondary cooling of the metal copper wire until the metal copper wire is cooled to 200±50°C; finally, water vapor and nitrogen at 200±50°C are introduced into the third cooling section 43 for cooling, until the metal copper wire is cooled to room temperature, wherein the volume content of water vapor in the water vapor and nitrogen mixture is 65%.

[0034] The water vapor channels of the water vapor preheating unit 31 and the first cooling section 41 and the third cooling section 43 have a connected water vapor channel 5 and a water vapor reflux channel 6, which can achieve energy-saving and environmental protection effects.

[0035] The present invention preheats the metal wire by water vapor before high-frequency induction heating annealing, which can alleviate the pulse of high-frequency induction heating and avoid the risk of the metal wire being burned while increasing the heating speed; The present invention uses a mixture of water vapor and nitrogen for cooling during the cooling process, and combines it with silicone oil cooling to improve the cooling efficiency while ensuring the surface quality of the metal wire. By using the cooling process of the present invention, the tensile strength and yield strength of the metal wire can be improved by about 5-10%. This is because water vapor is added for annealing. Water vapor has a high heat conduction efficiency and can improve the cooling efficiency, thereby reducing the influence of the inert gas on the physical properties of the material due to slow heat conduction.

[0036] The present invention pre-treats and shapes the metal wire before annealing, thereby improving the surface quality of the metal wire.

[0037] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A metal wire continuous annealing process, characterized in that: The following steps are involved: S1: Cleaning and shaping of metal wires; S2: preheating the metal wire with water vapor; S3: The preheated metal wire is annealed by high frequency induction heating; S4: Preliminary cooling of the metal wire using a mixture of water vapor and nitrogen; S5: Cooling the metal wire again using silicone oil; S6: Cooling the metal wire again with a mixture of water vapor and nitrogen until it cools to room temperature.

2. A metal wire continuous annealing process according to claim 1, characterized in that: The volume content of water vapor in the water vapor and nitrogen mixture in S4 is 20-50%.

3. A metal wire continuous annealing process according to claim 1, characterized in that: In the S4, the temperature is initially cooled to 400±50°C.

4. A metal wire continuous annealing process according to claim 1, characterized in that: In S6, when the metal wire is cooled to 200±50°C, the metal wire is cooled again with a mixture of water vapor and nitrogen until it is cooled to room temperature.

5. A metal wire continuous annealing process according to claim 1, characterized in that: The volume content of water vapor in the water vapor and nitrogen mixture in S6 is 50-80%.

6. A metal wire continuous annealing device, characterized in that: The invention comprises a wire cleaning unit, a wire shaping unit, an annealing unit and a cooling unit which are arranged in sequence; the annealing unit is provided with a water vapor preheating unit and a high-frequency induction heating unit; the cooling unit is provided with a first cooling section, a second cooling section and a third cooling section; a water vapor channel and a water vapor reflux channel which are connected are provided between the water vapor preheating unit, the first cooling section and the third cooling section; the first cooling section and the third cooling section are provided with a nitrogen inlet channel and a nitrogen outlet channel respectively, and the second cooling section is provided with a cooling oil inlet channel and a cooling oil outlet channel.

7. A metal wire continuous annealing device according to claim 6, characterized in that: The wire cleaning unit is provided with a plurality of groups of wire clamping devices.

8. A metal wire continuous annealing device according to claim 7, characterized in that: The wire clamping device includes a lower clamping assembly and an upper clamping assembly; the lower clamping assembly includes a lower support rod arranged in the wire cleaning unit and a lower clamping claw arranged on the lower support rod; the upper clamping assembly includes an upper support rod arranged in the wire cleaning unit, a push rod is arranged inside the upper support rod, one end of the push rod is provided with an upper clamping claw, and the other end is provided with an adjusting bolt, and the adjusting bolt is screwed on the upper support rod.

9. A metal wire continuous annealing device according to claim 8, characterized in that: The lower clamping jaw and the upper clamping jaw are both semicircular structures.

10. The metal wire continuous annealing device according to claim 6, characterized in that: The wire shaping unit is provided with an adjustable shaping fixture.

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