High-efficiency continuous casting and rolling production process for special-shaped copper rod

Abstract

The application relates to the technical field of special-shaped copper rods, and discloses a special-shaped copper rod efficient continuous casting and continuous rolling production process, which comprises the following steps: S1, smelting: electrolytic copper raw materials are placed in a reflection melting furnace for smelting and refining, the refining process comprises adding coke for first-time refining slag removal, and then adopting a reducing gas and a powdery slagging agent for twice refining, and the refining time is 30 minutes each time. The special-shaped copper rod efficient continuous casting and continuous rolling production process controls the temperature of the soaking section of rolling at 1200-1400 DEG C in copper billet preheating treatment, can control the copper billet surface decarburization layer, can avoid large oxidation burning loss, can ensure the continuous copper billet high-temperature diffusion time, can improve segregation, and is favorable for improving the internal quality of products. Generally, low-temperature heating is adopted to control the depth of the copper billet surface decarburization layer in the domestic, the soaking section temperature is not higher than 1100 DEG C, the carbon diffusion is uneven, the rolling mill load is large, the deformation is uneven, and the performance is unstable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of special-shaped copper rod, in particular to a special-shaped copper rod efficient continuous casting and rolling production process. BACKGROUND

[0002] Copper rod, generally produced by electrolytic copper, has a lower resistivity than low-oxygen copper rod, so it is more economical in the production of products with relatively stringent resistance requirements; the manufacture of oxygen-free copper rod requires high-quality raw materials; the superiority of oxygen-free copper rod is that it can be used to produce copper wire with a diameter of <0.5mm, and 6MM oxygen-free copper rod is used to produce copper flat wire. Due to different production processes of copper rod, the oxygen content and appearance of the produced copper rod are different. The oxygen content of the copper rod produced by upward drawing is below 20ppm, which is called oxygen-free copper rod.

[0003] Continuous casting and rolling, also known as continuous casting and rolling, is a metal rolling process in which liquid metal is poured into a continuous casting machine to cast metal billets (referred to as continuous casting billets), and then directly enters a hot continuous rolling mill for rolling after being kept in a soaking furnace for a certain time. This process ingeniously combines casting and rolling two processes, compared to the traditional process of first casting steel billets and then heating and rolling, it has the advantages of simplifying the process, improving the labor conditions, increasing the metal yield, saving energy, improving the quality of continuous casting billets, and facilitating mechanization and automation.

[0004] However, in the existing production process of special-shaped copper rod, impurities in the copper liquid cannot be fully removed, and the oxygen content is not easy to control, resulting in that the decarburized layer on the surface of the copper billet cannot be controlled, there is a large oxidation loss, and the temperature is too high, which causes the copper billet to be easily deformed. During high-temperature rolling of the copper billet, the deformation temperature becomes lower and lower, and the cumulative deformation amount becomes larger and larger, so with the increase of rolling passes, the grain in the center of the wire cross section is gradually refined, the segregation problem is serious, and the internal quality of the product is poor. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present application provides a special-shaped copper rod efficient continuous casting and rolling production process, which solves the above problems.

[0007] (II) Technical solutions

[0008] In order to solve the above problems, the present application provides the following technical solutions: a special-shaped copper rod efficient continuous casting and rolling production process, comprising the following steps:

[0009] S1, smelting: electrolytic copper raw material is placed in a reverberatory furnace to melt and refine, the refining process includes adding coke for the first refining deslagging, and then using reducing gas and powdered deslagging agent for refining twice, each refining time is 30 minutes, after refining, melt covering agent is used to quickly cover the surface of the aluminum alloy melt, and in the refining process, the copper liquid needs to be blown;

[0010] S2, holding: adding purification flux to the copper liquid obtained in step S1, then conveying the copper liquid into a degassing holding box, and heating the degassing holding box, online degassing is carried out by using the degassing holding box, the degassing holding box is provided with a rotating nozzle, pure nitrogen is introduced through the rotating nozzle, the gas pressure is 0.25 MPa, the gas flow is 1.8 m 3 / h, the rotating speed is 280 r / min, the degassing time is 7 min-9 min, and the temperature of the degassing holding box is controlled at 1150℃-1200℃;

[0011] S3, redox refining: dry pine wood is put into the copper liquid to remove oxygen in the copper liquid, the temperature is adjusted to 1000-1300℃, the stirring speed is 800-900 r / h, the oxygen concentration in the copper liquid is measured by using an oxygen measuring instrument, so that the oxygen concentration in the copper liquid reaches 120-200 ppm, and then the copper liquid flows into a double-stage ceramic filtering device for melt deslagging;

[0012] S4, deslagging: the copper liquid is transferred into a holding furnace, the holding temperature is set to 1000-1300℃, and the brownish gray suspended impurities on the surface of the copper liquid are removed by using a steel spoon, 60-80 g of copper liquid is taken out from the suspended matter scooped out, and the copper content is tested, if the copper content is above 60%, it is re-poured into the holding furnace, if it is below 60%, it is recycled to a copper storage tank, and the deslagging is repeated until the suspended impurities are less than 8-12% of the area of the copper liquid, and then the deslagging is stopped;

[0013] S5, continuous casting treatment: the copper liquid obtained in step S2 flows through a constant temperature heating furnace with a temperature of 1200±50℃ arranged in front of the continuous casting crystallizer, and then flows into the continuous casting machine, under the conditions that the rotating linear speed of the continuous casting crystallizer is 20-30 m / min, the cooling water flow is 20-40 min, the ultrasonic output frequency is 25 kHz, and the ultrasonic output power is 400 watts, and an oil smearing mechanism is arranged at the ingot discharging position of the continuous casting crystallizer, a layer of antioxidant lubricating oil is quickly and uniformly smeared on the surface of the continuous casting copper ingot discharged from the continuous casting crystallizer, and a copper billet is obtained;

[0014] S6, copper billet surface treatment: first, the copper billet is passed through a high-speed rotating steel brush to remove the iron scale on the surface of the billet, and then the copper billet is passed through a water explosion pool to remove defects on the surface of the copper billet, the cooling water inlet temperature is 30-40℃, the cooling water outlet temperature is 70-90℃, and the temperature of the copper billet when put into the water explosion pool is 800-900℃;

[0015] S7, copper blank preheating treatment: the copper blank after S6 treatment into the pit for slow cooling, after cooling the copper blank into the heating furnace for heating treatment, heating is divided into four heating, in turn for preheating, heating one, heating two and soaking section, the temperature of preheating section is 700-800℃, the temperature of heating one is 800-1000℃, the temperature of heating two is 1000-1200℃, the temperature of soaking section is 1200-1400℃, the total heating time of four heating section is controlled in 7-9h;

[0016] S8, copper blank hot rolling: the copper blank after S7 treatment is inserted into the inside of the copper blank, so that the same shape of the copper rod and the copper rod is correctly matched, and then sent into the profiled hole for rolling. The rolling speed of the copper blank is 13 m / min. The strength of the emulsion used in the rolling process is 0.2 MPa-0.4 MPa, and the temperature is less than 45℃. The entry temperature of the copper blank is controlled at 1200-1400℃, and the exit temperature is controlled at 400-600℃.

[0017] S9, the copper blank is rolled into a profiled copper rod with a diameter of 7-9mm by continuously passing through twelve rolling rolls. The drawing speed of the continuous casting machine is 30-50m / h, and the profiled copper rod is obtained.

[0018] S10, the profiled copper rod rolled out by step S9 is cooled and dried in a vacuum anti-oxidation tube and a cooling tank, and then washed with ethanol before being packed and stored.

[0019] Preferably, the reducing gas in step S1 is a mixed gas of nitrogen and carbon monoxide in a volume ratio of 1 / 9

[0020] Preferably, the anti-oxidation lubricating oil in step S5 comprises the following raw materials in parts by weight: neutral base oil 30-40 parts, anti-oxidation corrosion inhibitor 6-8 parts, anti-rust agent 1-3 parts, anti-wear agent 1-3 parts, dispersing agent 4-8 parts, and lubricant 14-24 parts.

[0021] Preferably, the oil smearing mechanism in step S5 is a high-pressure atomizing ring, which atomizes the anti-oxidation lubricating oil by nitrogen. The high-pressure atomizing ring sprays a ring-shaped anti-oxidation lubricating oil mist towards the exit position of the continuous casting crystallizer.

[0022] Preferably, the composition of the emulsion in step S8 is 1-3% emulsified oil, 4-6% alcohol, and the rest is sodium hydroxide solution. The PH value of the emulsion is adjusted to 8.2-8.6 by sodium hydroxide solution.

[0023] Preferably, in step S10, the profiled copper rod is surface cleaned by a 70% ethanol solution, the solution temperature is maintained at 40℃, the profiled copper rod is immersed in the ethanol solution for 20 seconds, and the cleaning speed is 120 m / h.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the present application provides a special-shaped copper rod high-efficiency continuous casting and rolling production process, which has the following beneficial effects:

[0026] 1. The special-shaped copper rod high-efficiency continuous casting and rolling production process, by using coke, pure nitrogen and powdered slagging agent for multi-refining in the process of smelting electrolytic copper raw materials, can remove the impurities in the copper liquid more fully; by simultaneously performing degassing and deslagging in the heat preservation process, the purity of the copper liquid can be further ensured; by using ultrasonic treatment in the continuous casting process, the continuous casting effect of the copper liquid is better, and the quality distribution of the copper billet after continuous casting is more uniform; the special-shaped copper rod is produced using the continuous casting and rolling process, and the production efficiency is higher.

[0027] 2. The special-shaped copper rod high-efficiency continuous casting and rolling production process uses dry pine wood to eliminate oxygen in the copper liquid and reduce pores in the copper billet, and the copper rod sequentially passes through antioxidant lubricating oil, emulsion and ethanol solution to improve various performance indicators of the special-shaped copper rod, and the quality of the special-shaped copper rod is obviously improved.

[0028] 3. In the copper billet preheating process of the special-shaped copper rod high-efficiency continuous casting and rolling production process, the temperature of the soaking section of rolling is controlled at 1200-1400℃, which can control the decarburized layer on the surface of the copper billet and avoid large oxidation burning loss, while ensuring the high-temperature diffusion time of the copper billet, improving segregation, and being beneficial to improving the internal quality of the product. Generally, low-temperature heating is used in China to control the depth of the decarburized layer on the surface of the copper billet, and the temperature of the soaking section does not exceed 1100℃. The existing shortcomings are uneven diffusion of carbides, large rolling mill load, uneven deformation, and unstable performance.

[0029] 3. In the process of rolling the rolled piece, the special-shaped copper rod high-efficiency continuous casting and rolling production process can reduce the temperature of the special-shaped copper rod before it enters the vacuum anti-oxidation tube and the cooling tank by reasonably controlling the rolling temperature and speed and using appropriate cooling methods, thereby avoiding the problem of excessive bending of the special-shaped copper rod caused by excessively high temperature of the special-shaped copper rod.

[0030] 4. The special-shaped copper rod high-efficiency continuous casting and rolling production process uses advanced smelting, refining and continuous casting and rolling technologies, and the degassing and deslagging process is advanced. In addition, various forging and filtering technologies are applied, so that the oxygen content in the special-shaped copper rod is small, the inclusions are few, and segregation almost does not exist. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0032] Embodiment one:

[0033] A high-efficiency continuous casting and rolling production process of special-shaped copper rods, comprising the following steps:

[0034] S1, smelting: placing electrolytic copper raw materials in a reflection melting furnace for melting and refining, the refining process comprising adding coke for the first refining deslagging, and then using reducing gas and powdered deslagging agent for twice refining, each time for 30 minutes; after refining, using a melt covering agent to quickly cover the surface of the aluminum alloy melt; and blowing air into the copper liquid during the refining process;

[0035] S2, heat preservation: adding a purification flux to the copper liquid obtained in step S1, then conveying the copper liquid into a degassing heat preservation box, and heating the degassing heat preservation box; on-line degassing is performed using the degassing heat preservation box, the degassing heat preservation box is provided with a rotating nozzle, pure nitrogen is introduced through the rotating nozzle, the gas pressure is 0.25 MPa, the gas flow is 1.8 m 3 / h, the rotating speed is 280 r / min, the degassing time is 7 min, and the temperature of the degassing heat preservation box is controlled at 1150℃;

[0036] S3, oxidation and reduction refining: putting dry pine wood into the copper liquid to remove oxygen in the copper liquid, adjusting the temperature to 1000℃ and stirring at a stirring speed of 800 r / h, using an oxygen measuring instrument to measure the oxygen concentration in the copper liquid, so that the oxygen concentration in the copper liquid reaches 120 ppm, and then flowing the copper liquid into a two-stage ceramic filtering device for melt deslagging;

[0037] S4, deslagging: transferring the copper liquid into a heat preservation furnace, setting the heat preservation temperature to 1000℃, removing the brown-gray suspended impurities on the surface of the copper liquid using a steel spoon, taking out 60 g of copper liquid from the suspended matter scooped out, performing copper content inspection, if the copper content is above 60%, then re- pouring into the heat preservation furnace, if below 60%, then recycling to a copper storage tank, and continuously deslagging until the suspended impurities are less than 8% of the area of the copper liquid to stop deslagging;

[0038] S5, continuous casting treatment: the copper liquid obtained in step S2 flows through a constant temperature heating furnace set in front of the continuous casting crystallizer at a temperature of 1150℃ and then flows into the continuous casting machine, under the conditions that the rotating linear speed of the continuous casting crystallizer is 20m / min, the cooling water flow is 20min, the ultrasonic output frequency is 25kHz, the ultrasonic output power is 400watts, and an oil smearing mechanism is set at the ingot discharging position of the continuous casting crystallizer, the surface of the continuous casting copper ingot discharged from the continuous casting crystallizer is quickly and uniformly smeared with a layer of antioxidant lubricating oil, and a copper billet is obtained;

[0039] S6, copper billet surface treatment: first, the copper billet is passed through a high-speed rotating steel brush to remove the scale on the surface of the billet, and then the copper billet is passed through a water explosion pool to remove the defects on the surface of the copper billet, the cooling water inlet temperature is 30℃, the cooling water outlet temperature is 70℃, and the temperature of the copper billet when put into the water explosion pool is 800℃;

[0040] S7, copper billet preheating treatment: the copper billet treated in S6 is put into a pit for slow cooling, and after cooling, the copper billet is put into a heating furnace for heating treatment, the heating is divided into four heating stages, in order, preheating stage, first heating stage, second heating stage and soaking stage, the temperature of the preheating stage is 700℃, the temperature of the first heating stage is 800℃, the temperature of the second heating stage is 1000℃, and the temperature of the soaking stage is 1200℃, the total heating time of the four heating stages is controlled to be 7h;

[0041] S8, copper billet hot rolling: the copper billet treated in S7 is inserted into the inside of the copper billet, so that the special-shaped core rod and the copper rod are correctly matched at the same shape, and then sent into the special-shaped hole for rolling, the rolling speed of the copper billet is 13m / min; the strength of the emulsion used in the rolling process is 0.2MPaMPa, and the temperature is less than 45℃; the entry temperature of the copper billet is controlled to be 1200℃, and the exit temperature is controlled to be 400℃;

[0042] S9, the copper billet is rolled into a special-shaped copper rod with a diameter of 7mm by continuously passing through twelve rolling mills, the drawing speed of the continuous casting machine is 30m / h, and a special-shaped copper rod is obtained;

[0043] S10, the special-shaped copper rod rolled in step S9 is cooled and dried in a vacuum anti-oxidation tube and a cooling tank, and then washed with ethanol, and then packed and stored.

[0044] Further, the reducing gas in step S1 is a mixed gas of nitrogen and carbon monoxide in a volume ratio of 1 / 9

[0045] Further, the antioxidant lubricating oil in step S5 comprises the following raw materials in parts by weight: neutral base oil 30 parts, antioxidant 6 parts, rust inhibitor 1 part, anti-wear agent 1 part, dispersant 4 parts, and lubricant 14 parts.

[0046] Further, the oil smearing mechanism in step S5 is a high-pressure atomizing ring, which sprays a ring-shaped anti-oxidation lubricating oil mist towards the ingot outlet of the continuous casting crystallizer by pressurizing and atomizing the anti-oxidation lubricating oil with nitrogen.

[0047] Further, the components of the emulsion in step S8 are 1% emulsified oil, 4% alcohol, and the rest is sodium hydroxide solution, and the pH value of the emulsion is adjusted to 8.2 by the sodium hydroxide solution.

[0048] Further, in step S10, the special-shaped copper rod is cleaned and reduced on the surface by a 70% ethanol solution, the solution temperature is kept at 40°C, the special-shaped copper rod is kept immersed in the ethanol solution for 20 seconds, and the cleaning speed is 120 m / h.

[0049] Example Two:

[0050] A high-efficiency continuous casting and rolling production process for special-shaped copper rods, comprising the following steps:

[0051] S1, smelting: placing electrolytic copper raw materials in a reflective melting furnace for smelting and refining, the refining process includes adding coke for the first refining and slag removal, and then using reducing gas and powdered slagging agent for refining twice, each time for 30 minutes, after refining, using a melt covering agent to quickly cover the surface of the aluminum alloy melt, and blowing air into the copper liquid during the refining process;

[0052] S2, heat preservation: adding a purification flux to the copper liquid obtained in step S1, then conveying the copper liquid into a degassing and heat preservation box, and heating the degassing and heat preservation box, online degassing is performed by using the degassing and heat preservation box, the degassing and heat preservation box is provided with a rotating nozzle, pure nitrogen is introduced through the rotating nozzle, the gas pressure is 0.25 MPa, the gas flow is 1.8 m 3 / h, the rotating speed is 280 r / min, the degassing time is 8 min, and the temperature of the degassing and heat preservation box is controlled at 1180°C;

[0053] S3, oxidation and reduction refining: putting dry pine wood into the copper liquid to remove oxygen in the copper liquid, adjusting the temperature to 1200°C and stirring at a speed of 850 r / h, using an oxygen analyzer to measure the oxygen concentration in the copper liquid, so that the oxygen concentration in the copper liquid reaches 160 ppm, and then flowing the copper liquid into a two-stage ceramic filtering device for melt slag removal;

[0054] S4, slag removal: transferring the copper liquid into a heat preservation furnace, setting the heat preservation temperature to 1150°C, removing the brown-colored suspended impurities on the surface of the copper liquid by using a steel spoon, taking out 70 g of copper liquid from the suspended matter scooped out, performing copper content testing, if the copper content is above 60%, then re-adding into the heat preservation furnace, if below 60%, then recycling into a copper storage tank, and continuously removing slag until the suspended impurities are less than 10% of the area of the copper liquid to stop slag removal;

[0055] S5, continuous casting treatment: the copper liquid obtained in step S2 is flowed into a continuous casting machine after flowing through a thermostatic heating furnace arranged in front of the continuous casting crystallizer and having a temperature of 1200℃, under the conditions that the rotating linear velocity of the continuous casting crystallizer is 25 m / min, the cooling water flow rate is 30 min, the ultrasonic output frequency is 25 kHz, the ultrasonic output power is 400 watts, and an oil smearing mechanism is arranged at the ingot discharging position of the continuous casting crystallizer, and a layer of antioxidation lubricating oil is quickly and uniformly smeared on the surface of the continuous casting copper ingot discharged from the continuous casting crystallizer, so as to obtain a copper blank;

[0056] S6, copper blank surface treatment: first, the copper blank is passed through a high-speed rotating steel brush to remove the iron oxide scale on the surface of the blank, and then the copper blank is passed through a water explosion pool to remove the defects on the surface of the copper blank, the cooling water inlet temperature is 35℃, the cooling water outlet temperature is 80℃, and the temperature of the copper blank when put into the water explosion pool is 850℃;

[0057] S7, copper blank preheating treatment: the copper blank treated in S6 is put into a pit for slow cooling, and after cooling, the copper blank is put into a heating furnace for heating treatment. The heating is divided into four heating stages, which are preheating stage, first heating stage, second heating stage and soaking stage, respectively. The temperature of the preheating stage is 750℃, the temperature of the first heating stage is 900℃, the temperature of the second heating stage is 1100℃, and the temperature of the soaking stage is 1200-1400℃. The total heating time of the four heating stages is controlled to be 8h;

[0058] S8, copper blank hot rolling: the copper blank treated in S7 is inserted into the inside of the copper blank, so that the special-shaped core rod and the copper rod are correctly matched at the same shape, and then sent into the special-shaped hole for rolling. The rolling speed of the blank is 13 m / min. The strength of the emulsion used in the rolling process is 0.3 MPa, and the temperature is less than 45℃. The entry temperature of the blank is controlled to be 1300℃, and the exit temperature is controlled to be 500℃;

[0059] S9, the copper blank is rolled into a special-shaped copper rod with a diameter of 8mm by continuously passing through twelve rolling mills. The drawing speed of the continuous casting machine is 40m / h, and a special-shaped copper rod is obtained.

[0060] S10, the special-shaped copper rod rolled in step S9 is cooled and dried in a vacuum anti-oxidation tube and a cooling tank, and then washed with ethanol before being packed and stored.

[0061] Further, the reducing gas in step S1 is a mixed gas of nitrogen and carbon monoxide in a volume ratio of 1 / 9

[0062] Further, the antioxidation lubricating oil in step S5 comprises the following raw materials in parts by weight: neutral base oil 35 parts, antioxidant 7 parts, rust inhibitor 2 parts, anti-wear agent 2 parts, dispersant 6 parts, and lubricant 18 parts.

[0063] Further, the oil smearing mechanism in step S5 is a high-pressure atomizing ring, which sprays a ring-shaped anti-oxidation lubricating oil mist towards the ingot outlet of the continuous casting crystallizer by pressurizing and atomizing the anti-oxidation lubricating oil with nitrogen.

[0064] Further, the components of the emulsion in step S8 are 2% emulsified oil, 5% alcohol, and the rest is sodium hydroxide solution, and the PH value of the emulsion is adjusted to 8.4 by the sodium hydroxide solution.

[0065] Further, in step S10, the special-shaped copper rod is cleaned and reduced on the surface by 70% ethanol solution, the solution temperature is kept at 40℃, the special-shaped copper rod is kept immersed in the ethanol solution for 20 seconds, and the cleaning speed is 120 m / h.

[0066] Example Three

[0067] A high-efficiency continuous casting and rolling production process for special-shaped copper rods, comprising the following steps:

[0068] S1, smelting: placing electrolytic copper raw materials in a reflective melting furnace for smelting and refining, the refining process includes adding coke for the first refining and slag removal, and then using reducing gas and powdered slagging agent for refining twice, each time for 30 minutes, after refining, using melt covering agent to quickly cover the surface of the aluminum alloy melt, and blowing air into the copper liquid during the refining process;

[0069] S2, heat preservation: adding a purification flux to the copper liquid obtained in step S1, then conveying the copper liquid into a degassing and heat preservation box, and heating the degassing and heat preservation box, online degassing is performed by using the degassing and heat preservation box, the degassing and heat preservation box is provided with a rotating nozzle, pure nitrogen is introduced through the rotating nozzle, the gas pressure is 0.25 MPa, the gas flow is 1.8 m 3 / h, the rotating speed is 280 r / min, the degassing time is 9 min, and the temperature of the degassing and heat preservation box is controlled at 1200℃;

[0070] S3, oxidation and reduction refining: putting dry pine wood into the copper liquid to remove oxygen in the copper liquid, adjusting the temperature to 1300℃ and stirring at a speed of 900 r / h, using an oxygen analyzer to measure the oxygen concentration in the copper liquid, so that the oxygen concentration in the copper liquid reaches 200 ppm, and then flowing the copper liquid into a two-stage ceramic filtering device for melt slag removal;

[0071] S4, slag removal: transferring the copper liquid into a heat preservation furnace, setting the heat preservation temperature to 1300℃, removing the brown-colored suspended impurities on the surface of the copper liquid by using a steel spoon, taking out 80 g of copper liquid from the suspended matter scooped out, performing copper content testing, if the copper content is above 60%, then re-adding into the heat preservation furnace, if below 60%, then recycling into a copper storage tank, and continuously removing slag until the suspended impurities are less than 8-12% of the area of the copper liquid to stop slag removal;

[0072] S5, continuous casting process: the copper liquid obtained in step S2 flows through a thermostatic heating furnace provided in front of the continuous casting crystallizer and having a temperature of 1250℃, and then flows into the continuous casting machine, under the conditions that the rotating linear velocity of the continuous casting crystallizer is 30 m / min, the cooling water flow rate is 40 min, the ultrasonic output frequency is 25 kHz, the ultrasonic output power is 400 watts, and an oil smearing mechanism is provided at the ingot discharging position of the continuous casting crystallizer, and a layer of antioxidation lubricating oil is quickly and uniformly smeared on the surface of the continuous casting copper ingot discharged from the continuous casting crystallizer, to obtain a copper blank;

[0073] S6, copper blank surface treatment: first, the copper blank is passed through a high-speed rotating steel brush to remove the scale on the surface of the blank, and then the copper blank is passed through a water explosion pool to remove defects on the surface of the copper blank, the cooling water inlet temperature is 40℃, the cooling water outlet temperature is 90℃, and the temperature of the copper blank when it is put into the water explosion pool is 900℃;

[0074] S7, copper blank preheating treatment: the copper blank treated in S6 is put into a pit for slow cooling, and after cooling, the copper blank is put into a heating furnace for heating treatment. The heating is divided into four heating stages, which are preheating stage, first heating stage, second heating stage and soaking stage, respectively. The temperature of the preheating stage is 800℃, the temperature of the first heating stage is 1000℃, the temperature of the second heating stage is 1200℃, and the temperature of the soaking stage is 1400℃. The total heating time of the four heating stages is controlled to be 9h;

[0075] S8, copper blank hot rolling: the copper blank treated in S7 is inserted into the inside of the copper blank, so that the profiled core rod and the copper rod are correctly matched at the same shape, and then it is sent into a profiled pass to be rolled, and the rolling speed of the blank is 13 m / min. The strength of the emulsion used in the rolling process is 0.4 MPa, and the temperature is less than 45℃. The entry temperature of the blank is controlled to be 1400℃, and the exit temperature is controlled to be 600℃;

[0076] S9, the copper blank is rolled into a profiled copper rod with a diameter of 9 mm by continuously passing through twelve rolling mills, and the drawing speed of the continuous casting machine is 50 m / h, to obtain the profiled copper rod;

[0077] S10, the profiled copper rod rolled in step S9 is cooled and dried in a vacuum anti-oxidation tube and a cooling tank, and then the profiled copper rod is cleaned with ethanol and packed into the warehouse.

[0078] Further, the reducing gas in step S1 is a mixed gas of nitrogen and carbon monoxide in a volume ratio of 1 / 9

[0079] Further, the antioxidation lubricating oil in step S5 comprises the following raw materials in parts by weight: neutral base oil 40 parts, anti-oxidation and corrosion inhibitor 8 parts, anti-rust agent 3 parts, anti-wear agent 3 parts, dispersant 8 parts, and lubricant 24 parts.

[0080] Further, the oil smearing mechanism in step S5 is a high-pressure atomizing ring, which sprays a ring-shaped anti-oxidation lubricating oil mist towards the ingot outlet of the continuous casting crystallizer by pressurizing and atomizing the anti-oxidation lubricating oil with nitrogen.

[0081] Further, the components of the emulsion in step S8 are 3% emulsified oil, 6% alcohol, and the rest is sodium hydroxide solution, which is used to adjust the pH value of the emulsion to 8.6.

[0082] Further, in step S10, the special-shaped copper rod is cleaned and reduced on the surface by 70% ethanol solution, the solution temperature is kept at 40 DEG C, the special-shaped copper rod is kept immersed in the ethanol solution for 20 seconds, and the cleaning speed is 120 m / h.

[0083] The present application has the following advantages:

[0084] 1. The special-shaped copper rod high-efficiency continuous casting and rolling production process can remove the impurities in the copper liquid more sufficiently by using coke, pure nitrogen and powdered slagging agent for multi-refining during the smelting of the electrolytic copper raw material, can further ensure the purity of the copper liquid by simultaneously performing degassing and deslagging during the heat preservation process, can make the continuous casting effect of the copper liquid better by using ultrasonic treatment during the continuous casting process, can make the quality distribution of the copper billet after continuous casting more uniform, and can produce the special-shaped copper rod by using the continuous casting and rolling process, thereby improving the production efficiency.

[0085] 2. The special-shaped copper rod high-efficiency continuous casting and rolling production process can eliminate the oxygen in the copper liquid and reduce the air holes in the copper billet by using dry pine wood, can improve various performance indexes of the special-shaped copper rod by sequentially making the copper rod pass through the anti-oxidation lubricating oil, the emulsion and the ethanol solution, and can obviously improve the quality of the special-shaped copper rod.

[0086] 3. The special-shaped copper rod high-efficiency continuous casting and rolling production process can control the decarburized layer on the surface of the copper billet and avoid the oxidation burning loss by controlling the temperature of the soaking section of the rolling at 1200-1400 DEG C, can ensure the high-temperature diffusion time of the copper billet, can improve the segregation, and is beneficial to improving the internal quality of the product.

[0087] 3. The special-shaped copper rod high-efficiency continuous casting and rolling production process can reduce the temperature of the special-shaped copper rod before it enters the vacuum anti-oxidation tube and the cooling tank by reasonably controlling the temperature and speed of the rolling and adopting a suitable cooling mode, thereby avoiding the problem that the high temperature of the special-shaped copper rod leads to the bending degree of the special-shaped copper rod exceeding the standard.

[0088] 4、The special-shaped copper rod high-efficiency continuous casting and rolling production process adopts advanced melting, refining and continuous casting and rolling technologies, and an advanced degassing and deslagging process, and various forging and filtering technologies are applied, so that the oxygen content in the special-shaped copper rod is small, the inclusions are few, and segregation almost does not exist.

[0089] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and spirit of the application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A high-efficiency continuous casting and rolling production process for irregularly shaped copper rods, characterized in that, Includes the following steps: S1, Smelting: Electrolytic copper raw material is placed in a reverberatory melting furnace for melting and refining. The refining process includes adding coke for the first refining and slag removal, followed by refining twice with reducing gas and powdered slag remover. Each refining time is 30 minutes. After refining, melt covering agent is used to quickly cover the surface of the melt. During the refining process, air needs to be blown into the copper liquid. S2, Insulation: Purifying flux is added to the molten copper obtained in step S1, and then the molten copper is transferred to a degassing and insulation box. The degassing and insulation box is heated for online degassing. The degassing and insulation box is equipped with a rotating nozzle through which pure nitrogen gas is introduced at a pressure of 0.25 MPa and a flow rate of 1.8 m³ / min. 3 / h, the rotation speed is 280r / min, the degassing time is 7min-9min, and the temperature of the degassing and heat preservation box is controlled at 1150℃-1200℃; S3, Oxidation-reduction refining: Dry pine wood is added to the copper liquid to remove oxygen from the copper liquid. The temperature is adjusted to 1000-1300℃ and stirred at a stirring speed of 800-900 r / h. The oxygen concentration in the copper liquid is measured using an oxygen analyzer to make the oxygen concentration in the copper liquid reach 120-200 ppm. Then the copper liquid flows into a two-stage ceramic filter device for melt slag removal. S4, Slag Removal: Transfer the molten copper to a holding furnace and set the holding temperature to 1000-1300℃. Use a steel spoon to remove the brownish-gray suspended impurities from the surface of the molten copper. Take 60-80g of molten copper from the suspended matter and test the copper content. If the copper content is above 60%, pour it back into the holding furnace. If it is below 60%, return it to the copper storage tank. Circulate the slag removal process until the suspended impurities are less than 8-12% of the surface area of ​​the molten copper and then stop slag removal. S5, Continuous casting process: The molten copper obtained in step S2 flows through a constant temperature heating furnace set in front of the continuous casting crystallizer at a temperature of 1200±50℃ and then into the continuous casting machine. Under the conditions of a crystallization wheel rotation speed of 20-30m / min, a cooling water flow rate of 20-40min, an ultrasonic output frequency of 25kHz, and an ultrasonic output power of 400W, a grease coating mechanism is set at the ingot outlet of the continuous casting crystallizer to quickly and evenly coat the surface of the continuous casting copper ingot discharged from the continuous casting crystallizer with a layer of anti-oxidation lubricating oil to obtain copper billet; S6, Copper billet surface treatment: First, the copper billet is passed through a high-speed rotating steel brush to remove the iron oxide scale on the surface of the billet. Then, the copper billet is passed through a water-blasting tank to remove defects on the surface of the copper billet. The inlet temperature of the cooling water is 30-40℃, the outlet temperature of the cooling water is 70-90℃, and the temperature of the copper billet when it is put into the water-blasting tank is 800-900℃. S7, Copper billet preheating treatment: The copper billet treated by S6 is placed in a pit for slow cooling. After cooling, the copper billet is placed in a heating furnace for heating treatment. The heating is divided into four stages: preheating stage, heating stage one, heating stage two, and soaking stage. The temperature of the preheating stage is 700-800℃, the temperature of heating stage one is 800-1000℃, the temperature of heating stage two is 1000-1200℃, and the temperature of soaking stage one is 1200-1400℃. The total heating time of the four stages is controlled at 7-9 hours. S8, Hot rolling of copper billets: A shaped mandrel is inserted into the copper billet after S7 treatment, ensuring proper fit between the mandrel and the copper rod at their corresponding shapes. The billet is then fed into a shaped die for rolling. The rolling speed of the billet is 13 m / min. The emulsion used during rolling has a strength of 0.2 MPa-0.4 MPa and a temperature less than 45℃. The billet's entry temperature is controlled at 1200-1400℃, and its exit temperature is controlled at 400-600℃. S9, after passing through twelve rolling mills continuously, the copper billet is rolled into a special-shaped copper rod with a diameter of 7-9mm. The traction speed of the continuous casting machine is 30-50m / h to obtain the special-shaped copper rod. S10: The irregular copper rod rolled in step S9 is cooled and dried in a vacuum anti-oxidation tube and cooling tank, and then cleaned with ethanol before being packaged and stored.

2. The high-efficiency continuous casting and rolling production process for irregularly shaped copper rods according to claim 1, characterized in that, In step S1, the reducing gas is a mixture of nitrogen and carbon monoxide in a volume ratio of 1 / 9.

3. The high-efficiency continuous casting and rolling production process for irregularly shaped copper rods according to claim 1, characterized in that, The antioxidant lubricating oil in step S5 comprises the following raw materials in parts by weight: 30-40 parts neutral base oil, 6-8 parts antioxidant and anti-corrosion agent, 1-3 parts rust inhibitor, 1-3 parts anti-wear agent, 4-8 parts dispersant, and 14-24 parts lubricant.

4. The high-efficiency continuous casting and rolling production process for irregularly shaped copper rods according to claim 1, characterized in that, In step S5, the grease application mechanism is a high-pressure atomizing ring. The high-pressure atomizing ring uses nitrogen to pressurize and atomize the anti-oxidation lubricating oil, and sprays an annular stream of anti-oxidation lubricating oil towards the ingot exit position of the continuous casting crystallizer.

5. The high-efficiency continuous casting and rolling production process for irregularly shaped copper rods according to claim 1, characterized in that, In step S8, the emulsion consists of 1-3% emulsified oil, 4-6% alcohol, and the remainder is sodium hydroxide solution. The pH of the emulsion is adjusted to 8.2-8.6 using sodium hydroxide solution.

6. The high-efficiency continuous casting and rolling production process for irregularly shaped copper rods according to claim 1, characterized in that, In step S10, the irregular copper rod is surface cleaned and reduced by a 70% ethanol solution, the solution temperature is maintained at 40°C, the irregular copper rod is immersed in the ethanol solution for 20 seconds, and the cleaning speed is 120m / h.