An energy-saving and efficient metal wire hot rolling production line and production process thereof

Abstract

An energy-saving and efficient metal wire hot rolling production line and its production process, belonging to the technical field of metal wire processing equipment, including a wire drawing machine, a high-frequency heater, a rolling mill, a first water cooling device, a heat preservation box, and a traction and wire-taking device arranged along the advancing direction of the metal wire. In this production line, the metal wire is reduced in diameter by the rolling mill when it is at high temperature, so that the arrangement between the wire grains of the metal wire is more uniform and the material density is better. The diameter reduction process of the rolling mill is equivalent to the forging principle, and the subsequent drawing is not easy to break the wire.

Description

Technical Field

[0001] The invention belongs to the technical field of metal wire processing devices, and in particular relates to an energy-saving and efficient metal wire hot rolling production line and a production process thereof. Background Art

[0002] The existing process flow of reducing the diameter of metal wire is generally as follows: after the metal wire is processed by multiple die drawing or rolling, the diameter is reduced to form a finished product or a semi-finished product.

[0003] Rolling is a different process from drawing. During rolling, the metal billet passes through the gap between a pair of rotating rollers. The metal wire is compressed by the rollers, and its cross section is reduced and its length is increased. Rolling is beneficial to improving the mechanical properties of the metal wire.

[0004] Therefore, it is necessary to provide an energy-saving and efficient metal wire hot rolling production line, which adopts a rolling process to reduce the diameter of the metal wire. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an energy-saving and efficient metal wire hot rolling production line.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] An energy-saving and efficient metal wire hot rolling production line comprises a wire drawing machine, a high-frequency heater, a rolling mill, a first water cooling device, a heat preservation box, and a traction and wire-taking device arranged along the advancing direction of the metal wire.

[0008] A wire-laying machine, a shelling machine and a sanding machine are arranged in front of the wire drawing machine along the advancing direction of the metal wire.

[0009] A traction machine is arranged between the wire drawing machine and the high-frequency heater; the high-frequency heater is provided with an electromagnetic heating coil for the metal wire to pass through.

[0010] The rolling mill comprises a permanent magnet motor, a main transmission shaft and a rolling box; the permanent magnet motor has a setting subassembly and a rotor assembly inside; an encoder is arranged inside the permanent magnet motor; one end of the main transmission shaft is fixedly connected to the output end of the permanent magnet motor, and the other end is connected to the rolling box; at least one pair of rollers is arranged at the output end of the rolling box.

[0011] A first tension device is arranged between the first water cooling device and the heat preservation box.

[0012] A second tension device, an air cooling box, a second water cooling device, and a third tension device are arranged between the heat preservation box and the traction and wire-taking device along the advancing direction of the metal wire.

[0013] An energy-saving and efficient metal wire hot rolling production process comprises the following steps:

[0014] Step S1, the metal wire on the pay-off machine passes through a shelling machine and a sanding machine in sequence; the shelling machine shells the surface of the metal wire to remove the film layer on the surface of the metal wire; the sanding machine grinds the surface of the metal wire to complete the rust removal treatment on the surface of the metal wire;

[0015] Step S2, the metal wire is passed through a wire drawing machine for a diameter reduction process;

[0016] Step S3, the metal wire passes through a traction machine and then enters a high-frequency heater;

[0017] Step S4, the metal wire is subjected to a diameter reduction process by a rolling mill;

[0018] Step S5, the metal wire is subjected to a water cooling process in a first water cooling device and then subjected to a heat preservation treatment in a heat preservation box;

[0019] Step S6, the metal wire is air-cooled in the air cooling box, then reaches the second water cooling device for water cooling, and then passes through the second tension device and is wound up in the traction and winding device.

[0020] In step S3: the high frequency heater generates heat by the internal ferromagnetic loss of the metal wire so that the internal temperature of the metal wire rises to 700°C to 1200°C.

[0021] In step S5: the temperature in the heat preservation box is controlled at 500°C to 600°C; in this step, the metal wire is isothermally transformed into troostite.

[0022] The present invention has the following advantages:

[0023] 1. This production line uses a sanding machine to continuously grind and polish the wire, replacing the previous chemical electrolytic pickling method with a physical sanding machine, thus reducing air pollution.

[0024] 2. This production line uses a high-frequency heater to heat the wire to reduce rolling resistance and improve the mechanical properties of the wire. At the same time, the high-frequency heater has a fast heating speed and uniform heating.

[0025] 3. This production line uses a permanent magnet motor as the driving source of the rolling mill, eliminating the reduction mechanism, making the transmission structure more compact and the transmission efficiency higher; simplifying the driving mode and structure, improving the driving efficiency, and realizing direct drive of the rolling device.

[0026] 4. This production line adopts water cooling device, the wire is cooled quickly and evenly, at the same time, it has little pollution to the environment and high efficiency.

[0027] 5. This production line uses a wire drawing machine to reduce the diameter of the metal wire, and then uses a high-frequency heater and a rolling mill to heat the wire to a high temperature, and then passes through the rolling mill to achieve secondary diameter reduction. The primary and secondary diameter reduction methods improve production efficiency and achieve high-speed transmission of metal wires.

[0028] 6. In this production line, the metal wire is reduced in diameter by the rolling mill when it is at high temperature. The arrangement of the wire grains is more uniform and the material density is better. The diameter reduction process of the rolling mill is equivalent to the forging principle, and the subsequent drawing is not easy to break the wire.

[0029] In summary, this production line has the advantages of fast speed, high efficiency and green environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the present invention;

[0032] Figure 3 It is the metallographic diagram of the finished product;

[0033] In the figure: wire laying machine 1, shelling machine 2, sanding machine 3, wire drawing machine 4, traction machine 5, high frequency heater 6,

[0034] Rolling mill 7, permanent magnet motor 7a, main transmission shaft 7b, rolling box 7c, encoder 7d, coupling 7e,

[0035] The first water cooling device 8, the first tension device 9, the heat preservation box 10, the second tension device 11, the air cooling box 12, the second water cooling device 13, the third tension device 14, and the traction and wire-taking device 15. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] An energy-saving and efficient metal wire hot rolling production line comprises a pay-off machine 1, a shelling machine 2, a sanding machine 3, a wire drawing machine 4, a traction machine 5, a high-frequency heater 6, a rolling mill 7, a first water cooling device 8, a first tension device 9, an insulation box 10, a second tension device 11, an air cooling box 12, a second water cooling device 13, a third tension device 14, and a traction and wire taking-up device 15, which are sequentially arranged along the advancing direction of the metal wire.

[0038] The shelling machine 2 and the abrasive belt machine 3 are both used to remove impurities on the surface of the metal wire. The shelling machine 2 is used for preliminary rust removal, and then the abrasive belt machine 3 is used for secondary rust removal to improve the effect of surface rust removal and improve production efficiency.

[0039] In traditional wire processing and production, wire rods must be pre-treated before entering the drawing process. The general process is: mechanical shelling - electrolytic pickling - surface boron coating - high temperature drying; then entering the wire drawing machine for drawing. In the production process, pickling is used to remove surface rust, which causes environmental pollution. In modern society, the requirements for the environment are getting higher and higher, which puts more and more pressure on enterprises in terms of environmental protection and increases production costs.

[0040] This production line uses a belt sander 3 to continuously grind and polish the wire, replacing the previous chemical electrolytic pickling method with a physical belt grinding method, thereby reducing air pollution.

[0041] In traditional wire processing and production, the wire is reduced in diameter after multiple drawing processes (divided into rough drawing and fine drawing).

[0042] This production line uses a wire drawing machine 4 to reduce the diameter of the metal wire, and then uses a high-frequency heater 6 and a rolling mill 7 to heat the wire to a high temperature of more than 800°C, and then the metal structure is reduced to austenite, and then the rolling mill is used to achieve secondary diameter reduction. The primary and secondary diameter reduction methods improve production efficiency and achieve high-speed transmission of metal wires.

[0043] The traction machine 5 provides power for conveying the metal wire from the wire drawing machine 4 to the high-frequency heater 6 .

[0044] The high frequency heater 6 generates heat by utilizing the thermal effect principle of electric current, and has a fast heating speed and high efficiency.

[0045] The high frequency heater 6 is provided with an electromagnetic heating coil for the metal wire to pass through.

[0046] After the high-frequency heater 6 is powered on, the alternating current is rectified and filtered to obtain direct current, which is then converted into high-frequency current through an inverter circuit and output to the annular electromagnetic heating coil through a high-frequency transformer, generating a strong magnetic flux with instantaneous polarity changes inside the electromagnetic heating coil.

[0047] When the metal wire passes through the electromagnetic heating coil, the magnetic flux will penetrate the entire heated object, and a corresponding large eddy current will be generated inside the metal wire in the opposite direction of the heating current. Due to the resistance of the metal wire, a lot of Joule heat will be generated, causing its own temperature to rise rapidly, thus achieving the purpose of heating the metal wire.

[0048] The rolling mill 7 includes a permanent magnet motor 7a, a main transmission shaft 7b, and a rolling box 7c.

[0049] The permanent magnet motor 7a has a stator assembly and a rotor assembly therein, and the stator assembly is fixed on the frame. The permanent magnet motor 7a is provided with an encoder 7d therein. Preferably, the encoder 7d is fixedly arranged at the bottom of the permanent magnet motor 7a.

[0050] One end of the main transmission shaft 7b is fixedly connected to the output end of the permanent magnet motor 7a, and the other end is connected to the rolling box 7c. As a preferred embodiment, the main transmission shaft 7b is connected to the output end of the permanent magnet motor 7a through a coupling 7e. As another preferred embodiment, the main transmission shaft 7b and the output end of the permanent magnet motor 7a are an integrated structure.

[0051] As a preferred embodiment, the main transmission shaft 7b is fixedly connected to the input shaft of the rolling box 7c, and the main transmission shaft 7b drives the input shaft of the rolling box 7c to rotate. As another preferred embodiment, the main transmission shaft 7b is inserted into the rolling box 7c and fixedly connected to the input gear of the rolling box 7c. In this case, the main transmission shaft 7b is equivalent to the input shaft of the rolling box 7c.

[0052] At least one pair of rollers is disposed at the output end of the rolling box 7c.

[0053] The rolling mill 7 adopts a permanent magnet motor, eliminating the reduction mechanism, making the transmission structure more compact and the transmission efficiency higher; in the permanent magnet motor, the rotor assembly is directly connected to the equipment, and the stator assembly is fixed on the frame to reduce the intermediate driving links such as gears and reduction boxes, simplify the driving method and structure, improve the driving efficiency, and realize direct drive of the rolling device.

[0054] The first water cooling device 8 water cools the metal wire, and the metal wire structure isothermally transformed into troostite. The heat preservation box 10 is used to keep the metal wire that has passed the water cooling process of the first water cooling device 8 warm, so as to eliminate the residual stress of the metal wire, prevent deformation and cracking, homogenize the metal structure, and improve the structural stability of the metal wire. The metal wire after being kept warm in the heat preservation box 10 has good comprehensive mechanical properties. The temperature in the heat preservation box 10 is 500℃~600℃.

[0055] The air cooling box 12 air cools the metal wire. After the air cooling, the metal wire passes through the second water cooling device 13, and its temperature approaches the room temperature. Then, the metal wire passes through the second tension device 11 and the traction and take-up device 15 for winding.

[0056] Through the setting of this production line, through the coordination between various equipment, for example, the secondary rust removal mechanism composed of the shelling machine 2 and the sanding machine 3, the secondary diameter reduction mechanism composed of the wire drawing machine 4 and the rolling mill 7, the wire feeding speed can reach 450~500m / min, while the wire feeding speed of the traditional metal wire production line is about 240m / min. Therefore, this production line can realize high-speed hot rolling of metal wires.

[0057] The metal wire cooling mechanism composed of the first water cooling device 8, the heat preservation box 10 and the air cooling box 12 transforms the structure of the metal wire into troostite, which has good comprehensive mechanical properties.

[0058] In addition, this production line adopts physical rust removal methods, and the entire production line does not use chemical solvents, achieving green and environmentally friendly production.

[0059] An energy-saving and efficient metal wire hot rolling production process comprises the following steps:

[0060] Step S1, the metal wire on the pay-off machine 1 passes through the shelling machine 2 and the sanding machine 3 in sequence; the shelling machine 2 shells the surface of the metal wire to remove the film layer on the surface of the metal wire; the sanding machine 3 grinds the surface of the metal wire to complete the rust removal treatment on the surface of the metal wire.

[0061] Step S2, the metal wire is passed through the wire drawing machine 4 for a diameter reduction process.

[0062] Step S3, the metal wire passes through the traction machine 5 and enters the high-frequency heater 6; the high-frequency heater 6 generates heat by the internal ferromagnetic loss of the metal wire to raise the internal temperature of the metal wire to 700°C~1200°C.

[0063] Step S4, the metal wire is subjected to a diameter reducing process by a rolling mill 7.

[0064] When the metal wire is at a high temperature, it is reduced in diameter by the rolling mill 7, so that the arrangement of the wire grains of the metal wire is more uniform and the material density is better. The diameter reduction process of the rolling mill 7 is equivalent to the forging principle, and the subsequent drawing is not easy to break the wire.

[0065] Step S5: After the metal wire has been cooled by the first water cooling device 8, it is kept warm in the heat preservation box 10. The temperature in the heat preservation box 10 is controlled at 500°C to 600°C.

[0066] In this step, the metal wire is isothermally transformed into troostite.

[0067] Step S6, the metal wire is air-cooled in the air cooling box 12 and then reaches the second water cooling device 13 for water cooling. Then, it passes through the second tension device 11 and is wound up in the traction and winding device 15.

[0068] After the above steps, the steel wire with grade 70 finally obtains 2.74mm wire. Its microstructure shows: pearlite + a small amount of ferrite. The troostite conversion rate is level 1, 95%; its test performance is as follows:

[0069]

[0070] Therefore, the steel wire prepared by this scheme has a microstructure mainly composed of refined troostite, a tensile strength higher than 1100 MPa, improved toughness, and an elongation of about 10%.

[0071] It is understandable that, for those skilled in the art, equivalent substitutions or changes can be made according to the technical solution and inventive concept of the present invention, such as changing the number of transmission gears, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. An energy-saving and efficient metal wire hot rolling production process, characterized in that: It adopts an energy-saving and efficient metal wire hot rolling production line, which includes a wire drawing machine (4) arranged along the advancing direction of the metal wire, a high-frequency heater (6), a rolling mill (7), a first water cooling device (8), a heat preservation box (10), and a traction and wire taking-up device (15); A wire-laying machine (1), a shelling machine (2), and a sanding machine (3) are arranged in front of the wire drawing machine (4) along the advancing direction of the metal wire; A traction machine (5) is arranged between the wire drawing machine (4) and the high-frequency heater (6); an electromagnetic heating coil is arranged inside the high-frequency heater (6) for the metal wire to pass through; A first tension device (9) is arranged between the first water cooling device (8) and the heat preservation box (10); A second tension device (11), an air cooling box (12), a second water cooling device (13), and a third tension device (14) are arranged between the heat preservation box (10) and the traction and wire-taking device (15) along the advancing direction of the metal wire; An energy-saving and efficient metal wire hot rolling production process comprises the following steps: Step S1, the metal wire on a wire-laying machine (1) passes through a shelling machine (2) and a sanding machine (3) in sequence; the shelling machine (2) shells the surface of the metal wire to remove the film layer on the surface of the metal wire; the sanding machine (3) grinds the surface of the metal wire to complete the rust removal treatment on the surface of the metal wire; Step S2, the metal wire is subjected to a diameter reduction process by a wire drawing machine (4); Step S3, the metal wire passes through the traction machine (5) and then enters the high-frequency heater (6); Step S4, the metal wire is subjected to a diameter reduction process by a rolling mill (7); Step S5, the metal wire is subjected to a water cooling process in the first water cooling device (8), and then subjected to a heat preservation treatment in a heat preservation box (10); Step S6, the metal wire is air-cooled in the air cooling box (12), then reaches the second water cooling device (13) for water cooling, and then passes through the third tension device (14) and is wound up in the traction and winding device (15).

2. The energy-saving and efficient metal wire hot rolling production process according to claim 1, characterized in that: The rolling mill (7) comprises a permanent magnet motor (7a), a main transmission shaft (7b), and a rolling box (7c); a setting subassembly and a rotor assembly are provided in the permanent magnet motor (7a); an encoder (7d) is provided in the permanent magnet motor (7a); one end of the main transmission shaft (7b) is fixedly connected to the output end of the permanent magnet motor (7a), and the other end is connected to the rolling box (7c); and at least one pair of rollers is provided at the output end of the rolling box (7c).

3. The energy-saving and efficient metal wire hot rolling production process according to claim 1, characterized in that: In step S3: the high frequency heater (6) generates heat by utilizing the internal ferromagnetic loss of the metal wire material so that the internal temperature of the metal wire material rises to 700°C to 1200°C.

4. The energy-saving and efficient metal wire hot rolling production process according to claim 1, characterized in that: In step S5: the temperature in the heat preservation box (10) is controlled at 500°C to 600°C; in this step, the metal wire is isothermally transformed into troostite.

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