TIG Welding Smoke-Free Copper Strip and Its Production Process

Abstract

The present invention provides a non-smoking copper strip for argon arc welding and a production process thereof. The production process includes a horizontal continuous casting step, a milling step, a rough rolling step, a thick shearing step, an intermediate annealing step, a finishing step, a copper strip thick washing step, a finished product annealing step, and a copper strip thin washing step. The finishing step includes an air blowing deoiling step, and the air blowing deoiling step includes blowing the surface of the copper strip obtained in the finishing step under the conditions of 0.25 to 0.45 MPa. The present application adds an air blowing deoiling step to the finishing step, and utilizes the strong blowing effect under the above pressure conditions to remove the residual oil on the surface of the copper strip as much as possible, thereby improving the cleanliness of the copper strip surface, stabilizing the welding forming process, avoiding the phenomenon of skipped welding, and no smoke will occur during the welding process of the RF cable production, and finally obtaining a qualified RF cable. On the other hand, the consumption of cleaning fluid used in the copper strip thick washing step and the copper strip thin washing step is reduced, thereby reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of argon arc welding copper strip processing, and more particularly, to an argon arc welding smokeless copper strip and its production process. Background Art

[0002] When producing argon arc welding copper strip using horizontally continuous cast strip billets, not only are there strict requirements for key performance indicators such as the tensile strength, elongation, conductivity, and Vickers hardness of the copper strip, but also higher requirements for the surface quality of the copper strip, especially for the oil content on the surface. Because poor surface quality of the argon arc welding copper strip will affect the welding process of the copper strip, resulting in unstable forming during the welding process and the occurrence of skipped welding. After grooving, holes are formed, causing the product to be unqualified. And the attachment of residual oil on the surface of the argon arc welding copper strip will cause smoking during the welding of the copper strip, resulting in unstable forming, and thus the welding needle is prone to jitter during the copper strip welding process, and then it is extremely easy to have the phenomenon of skipped welding.

[0003] During the rolling process of the copper strip through a four-high reversing finishing mill, rolling oil is used to lubricate the roll and the surface of the copper strip, reducing the friction between the copper strip and the roll, thereby reducing energy consumption, ensuring product accuracy and surface roughness, reducing the wear degree of the finishing mill rolls, extending the service life, and at the same time being able to fully cool the rolling deformation zone and eliminate the adverse effect of roll thermal crown on the strip shape; however, after the copper strip is coiled, residual oil adheres to the surface of the copper strip. After thick washing of the copper strip, finish annealing, and thin washing of the copper strip, the residual oil on the surface of the copper strip cannot be completely cleaned, resulting in the adhesion of residual oil on the surface of the copper strip, causing smoking during the welding process of the argon arc welding copper strip.

[0004] The application of radio frequency copper strip is continuous argon arc welding, which has extremely high requirements for the residual oil content on the strip surface. Trace amounts of residual oil that cannot be observed by the naked eye will also cause welding smoking problems. Our company was the first in the industry to apply the method of using a dyne pen to detect the surface tension of the strip surface to indirectly measure the surface residual oil situation. Currently, full oil lubrication is generally adopted in copper strip high-speed finishing mills. Removing oil from the strip surface after copper strip rolling is an industry-wide problem. Existing oil removal methods are generally divided into mill oil removal and cleaning oil removal, and the treatment of welding smoking problems for radio frequency copper strips has been unstable, and welding smoking problems for radio frequency copper strips occur from time to time.

[0005] During the rolling process of the copper strip, due to the long-term use of rolling oil, the viscosity of the rolling oil will continuously increase, increasing the adhesion between the copper strip and the rolling oil, increasing the difficulty of subsequent cleaning of the residual oil on the surface of the copper strip; at the same time, after finishing coiling, the residual oil amount of the copper coil is large, increasing the consumption of thick washing degreaser and thin washing cleaning solution, resulting in economic losses; most importantly, residual oil adheres to the surface of the finished radio frequency copper strip, causing smoking during the welding process of the copper strip in the production of radio frequency cables, resulting in unstable forming during the welding process, the occurrence of skipped welding, and cracking during the subsequent grooving process, causing the radio frequency cable to be unqualified. Summary of the Invention

[0006] The main object of the present invention is to provide a non-smoking copper strip for argon arc welding and its production process, so as to solve the problem of smoking during the welding process in the production of radio frequency cables in the prior art.

[0007] To achieve the above object, according to one aspect of the present invention, there is provided a production process for a non-smoking copper strip for argon arc welding, including: a horizontal continuous casting step, a milling step, a rough rolling step, a thick shearing step, an intermediate annealing step, a finish rolling step, a thick washing step for the copper strip, a finished product annealing step, and a thin washing step for the copper strip. In the finish rolling step, there is an air blowing and oil removal step, and the air blowing and oil removal step includes purging the surface of the copper strip obtained in the finish rolling step under the condition of 0.25 to 0.45 MPa.

[0008] Further, in the last finish rolling of the above finish rolling step, the air blowing and oil removal step is carried out. Preferably, the running speed of the copper strip is 260 to 280 m / min. Preferably, the air blowing and oil removal step includes a first purge and a second purge. Among them, the pressure of the first purge is 0.4 to 0.45 MPa. Preferably, the air volume of the first purge is 15 ± 1 m 3 / h. Preferably, the pressure of the second purge is 0.25 to 0.30 MPa. Preferably, the air volume of the second purge is 25 ± 1 m 3 / h. Preferably, the air flow temperature of the second purge is 50 to 60 °C.

[0009] Further, in the above finish rolling step, the viscosity of the rolling oil is controlled between 5.0 and 7.0 mm 2 / s.

[0010] Further, the residual oil on both sides of the copper coil after the finish rolling step and coiling is sucked and treated. Preferably, a wet and dry vacuum cleaner is used for sucking and treatment. Preferably, the capacity of the wet and dry vacuum cleaner is controlled to be 30 to 35 L. Preferably, the power of the wet and dry vacuum cleaner is 1400 to 1450 W. Preferably, the vacuum degree of the wet and dry vacuum cleaner is 20 to 22 KPa. Preferably, the suction force of the wet and dry vacuum cleaner is 19000 to 20000 Pa.

[0011] Further, the squeezing rollers used in the above thick washing step and thin washing step of the copper strip are independently 3M squeezing rollers. Preferably, the specification of the 3M squeezing roller is

[0012] Further, in the above thick washing step of the copper strip, a solid degreasing agent is added to the cleaning solution used. Preferably, the solid degreasing agent is solid degreasing agent K601 and / or CM-082. Preferably, the mass concentration of the solid degreasing agent in the cleaning solution is controlled to be 2 to 4 wt%.

[0013] Furthermore, in the above-mentioned copper strip thick washing step, the cleaning liquid is sprayed onto the surface of the copper strip using a nozzle, and the surface of the copper strip is swept by a cleaning brush at the same time; when the direction of the nozzle spraying the cleaning liquid is opposite to the rotation direction of the cleaning brush, the contact point between the cleaning brush and the copper strip surface coincides with the spray point of the nozzle spraying the liquid; when the direction of the nozzle spraying the cleaning liquid is consistent with the rotation direction of the cleaning brush, the liquid sprayed by the nozzle is radially deviated by 5 to 10 degrees to the side of the cleaning brush surface.

[0014] Furthermore, the finished product annealing step is carried out in a protective gas, wherein the protective gas is an inert gas or nitrogen, preferably nitrogen. The temperature of the finished product annealing step is controlled at 300-350° C., and the flow rate of the nitrogen is increased by 18-22% during the holding stage.

[0015] Furthermore, in the above copper strip thin washing step, a liquid degreasing agent is added to the degreasing liquid used, preferably the liquid degreasing agent is alkaline liquid degreasing agent K803 and / or K610, and the mass concentration of the liquid degreasing agent in the degreasing liquid is preferably controlled to be 4-6wt%.

[0016] According to another aspect of the present invention, a non-smoking copper strip for argon arc welding is provided. The non-smoking copper strip for argon arc welding is prepared by the aforementioned production process.

[0017] By applying the technical solution of the present invention, the viscosity of the rolling oil in the finishing step is relatively high, and the adhesion between the copper strip and the rolling oil is relatively strong. This application adds an air-blowing oil removal step in the finishing step, and utilizes the strong blowing effect under the above pressure conditions to remove the residual oil on the surface of the copper strip as much as possible, so that the residual oil on the copper coil after finishing rolling is relatively small, so that the residual oil on the surface of the copper strip obtained after the simple copper strip thick washing step and the copper strip thin washing step is very small, thereby improving the cleanliness of the copper strip surface, stabilizing the welding forming process, avoiding the phenomenon of jump welding, and no smoking will occur during the welding process of RF cable production, and no cracking will occur during the subsequent corrugation process, thereby improving the yield rate of RF copper strip and finally obtaining qualified RF cables. On the other hand, the consumption of cleaning fluid used in the copper strip thick washing step and the copper strip thin washing step is reduced, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 An oil removal device for a copper strip finishing process provided according to Example 27 of the present invention is shown.

[0020] The above drawings include the following reference numerals:

[0021] 1. Copper belt; 2. 3M squeeze roller; 3. First air blowing device; 4. Second air blowing device; 5. First fixed plate; 6. First movable plate; 7. Bent steel pipe; 8. Second fixed plate; 9. Second movable plate; 10. Straight steel pipe. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] As analyzed in the background technology of this application, in the prior art, there is a problem of smoke generation during the welding process of radio frequency cable production. In order to solve this problem, this application provides an argon arc welding non-smoking copper strip and a production process thereof.

[0024] In a typical embodiment of the present application, a production process for argon arc welding smokeless copper strip is provided, comprising: a horizontal continuous casting step, a milling step, a rough rolling step, a thick shearing step, an intermediate annealing step, a finishing step, a copper strip thick washing step, a finished product annealing step and a copper strip thin washing step, wherein the finishing step comprises an air blowing degreasing step, and the air blowing degreasing step comprises purging the surface of the copper strip obtained in the finishing rolling step under conditions of 0.25 to 0.45 MPa.

[0025] The viscosity of the rolling oil in the finishing step is relatively high, and the adhesion between the copper strip and the rolling oil is relatively strong. The present application adds an air-blowing oil removal step in the finishing step, and utilizes the strong blowing effect under the above pressure conditions to remove the residual oil on the surface of the copper strip as much as possible, so that the residual oil on the copper coil after finishing rolling is relatively small, so that the residual oil on the surface of the copper strip obtained after the simple copper strip thick washing step and the copper strip thin washing step is very small, thereby improving the cleanliness of the copper strip surface, stabilizing the welding forming process, avoiding the phenomenon of skipped welding, and no smoking will occur during the welding process of RF cable production, and no cracking will occur during the subsequent corrugation process, thereby improving the yield rate of RF copper strip and finally obtaining qualified RF cables. On the other hand, the consumption of cleaning fluid used in the copper strip thick washing step and the copper strip thin washing step is reduced, thereby reducing costs.

[0026] Before the above air-blowing degreasing step, it is preferred to use a 3M squeeze roller to squeeze and degrease the copper strip. Since the 3M squeeze roller has porous characteristics and good consistency, the 3M squeeze roller always maintains close contact with the entire copper strip, which can produce a uniform squeezing effect and obtain the best squeezing performance; at the same time, the 3M squeeze roller has a high friction coefficient, so there is no need for an auxiliary motor, and a faster production line processing speed can be obtained, so that the 3M roller squeeze can produce a uniform squeezing effect, squeeze out a large amount of residual oil attached to the surface of the copper strip, and remove a large amount of residual oil on the surface of the copper strip.

[0027] In an embodiment of the present application, an air blowing oil removal step is carried out in the last finishing rolling of the above finishing rolling step. Preferably, the running speed of the copper strip is 260-280 m / min. Preferably, the air blowing oil removal step includes a first purge and a second purge. Among them, the pressure of the first purge is 0.4-0.45 MPa. Preferably, the air volume of the first purge is 15±1 m 3 / h. Preferably, the pressure of the second purge is 0.25-0.30 MPa. Preferably, the air volume of the second purge is 25±1 m 3 / h. Preferably, the air flow temperature of the second purge is 50-60 °C.

[0028] During the last finishing rolling of the finishing rolling step, two-stage pressurized purging is adopted. First, the first purge under high pressure is started to conduct a preliminary strong purge on the surface of the copper strip, greatly reducing the surface bonding force between the copper strip and the rolling oil, so as to blow most of the rolling oil remaining on the surface of the copper strip off the surface of the copper strip. Then, the rolling oil remaining on the surface of the copper strip is further removed through the second purge under slightly reduced pressure conditions, so as to ensure the strong removal of the rolling oil on the surface of the copper strip and reduce the operation difficulty and cost as much as possible. Preferably, a pressurized air blowing device with sharp-angle fine holes is used, which is conducive to forming a stronger purging effect. Preferably, the pressure of the first purge is controlled at 0.4-0.45 MPa, and the air volume is controlled at 15±1 m 3 / h, so as to better exert the first purge effect of the air flow on the rolling oil on the surface of the copper strip 1. Preferably, the pressure of the second purge is controlled at 0.25-0.30 MPa, and the air volume is controlled at 25±1 m 3 / h, so as to better exert the removal effect of the air flow on the rolling oil on the surface of the copper strip 1. Compared with the conventional 300-320 m / min of the prior art, preferably controlling the running speed of the copper strip at 260-280 m / min is more conducive to exerting the effect of the above oil removal method and reducing the residual oil amount on the surface of the copper strip 1 after coiling. Preferably, the temperature of the gas after heat treatment is controlled at 50-60 °C, so that the air flow has a certain amount of heat, and using this hot air flow helps to accelerate the volatilization of the rolling oil on the surface of the copper strip 1 after the first purge.

[0029] In an embodiment of the present application, in the finishing rolling step, the viscosity of the rolling oil is controlled between 5.0-7.0 mm 2 / s.

[0030] Controlling the viscosity of the rolling oil of the finishing mill within the above range helps to reduce the bonding force between the rolling oil and the surface of the copper strip, thereby reducing the difficulty of removing the rolling oil on the surface of the copper strip. Preferably, the viscosity of the rolling oil is controlled within the above range by adding a low-viscosity rolling oil for dilution. The viscosity of the rolling oil on the surface of the copper strip is indirectly measured by the method of detecting the surface tension of the copper strip with a dyno pen. Specifically as follows:

[0031] The rolling oil of the copper strip finishing mill is detected once a month using an ST-1506 automatic kinematic viscosity analyzer, following the steps below: ① Add distilled water: Inject distilled water into the water bath of the automatic kinematic viscosity analyzer. The water level after injection should not exceed 3 cm from the top cover. ② Sampling: Prepare a clean beaker with a specification of 250 mL and no dirt on the surface. Take 100 - 150 mL of rolling oil from the finishing mill. ③ Power on: Turn on the power switch on the left side of the device. After the power is connected, the light in the water bath is always on, the circulation fan rotates, and the liquid crystal display shows. ④ Parameter setting: After the device is powered on, it shows the "Test" interface. Then, tap "Return", "Preparation", and "Viscosimeter Parameter Setting" in sequence with your finger. The numbers in the viscometer parameter setting interface correspond to the numbers of the "viscometer holes" respectively. Enter the diameters and constants of the four capillary viscometers currently owned by our company. After entering, paste the corresponding constants on the viscometer hole and in the placement box, indicating that the viscometer hole and the placement box can correspond one by one in future tests to ensure that the viscometer hole and the constant correspond during each viscosity measurement to ensure the accuracy of the viscosity value. ⑤ Constant temperature setting: After setting the viscometer constant, tap "Return", then tap "Constant Temperature Setting". Six temperatures are available for selection on this instrument, namely 20°C, 40°C, 50°C, 80°C, 100°C, and custom temperature. Therefore, select 40°C according to the actual temperature of the rolling oil during use. ⑥ Temperature control: After setting the temperature, tap "Return" twice continuously to return to the test, preparation, and data recording interfaces. Tap "Test", and then tap "Temperature Control" in the lower left corner to enter the water bath heating and temperature control stage. ⑦ Sample preparation: Invert the viscometer, insert the thin nozzle of the U-tube into the rolling oil, block the thick nozzle with one finger, and use a suction bulb to suck at the suction port at the thick nozzle end to create a negative pressure in the viscometer, causing the rolling oil to be pressed into the viscometer. When the rolling oil is pressed into the second oval lower scale line, quickly invert the viscometer and blow the rolling oil into the oil storage position with an ear syringe. Rinse the viscometer at least twice in this way and prepare the sample in the same way. ⑧ Preheating: After the temperature reaches 40°C, place the viscometer filled with rolling oil into the fixture and put the fixture into the water bath for preheating. It is required that the first oval upper scale line is inserted into the distilled water, and preheat for 4 - 5 minutes. ⑨ Timing: Use a suction bulb to suck at the thin nozzle of the U-type viscometer to make the rolling oil gradually rise above the first oval upper scale line. Remove the suction bulb and record the time in seconds when the rolling oil drops from the first oval upper scale line to the second oval lower scale line, and record the relevant data. ⑩ Calculate, power off, and clean the viscometer: Multiply the recorded time by the corresponding constant of the viscometer to obtain the viscosity value of the rolling oil. Turn off the viscosity analyzer, pour the remaining rolling oil into a specific container bucket, clean all the related utensils, and put the viscometer into the corresponding box.

[0032] In an embodiment of the present application, the residual oil on both sides of the copper coil after the finish rolling step and coiling is sucked, preferably using a wet and dry vacuum cleaner for sucking. Preferably, the capacity of the wet and dry vacuum cleaner is controlled to be 30 - 35 L, the power of the wet and dry vacuum cleaner is preferably 1400 - 1450 W, the vacuum degree of the wet and dry vacuum cleaner is preferably 20 - 22 KPa, and the suction force of the wet and dry vacuum cleaner is preferably 19000 - 20000 Pa.

[0033] By using the wet function to suck and remove the rolling oil on the surface of the copper strip, the residual oil amount on the surface of the copper coil is reduced, the cleaning difficulty of the copper strip is lowered. At the same time, the consumption of the degreasing agent in the thick washing step and the thin washing step of the copper strip is reduced, thereby reducing the cost. Preferably, controlling the parameter values such as the capacity, power, vacuum degree, and suction force of the wet and dry vacuum cleaner within the above ranges helps to further improve the efficiency and effect of oil removal by the sucking process.

[0034] To improve the squeezing effect on the surface of the copper strip, preferably, the squeezing rollers used in the thick washing step and the thin washing step of the copper strip are each independently 3M squeezing rollers, and the specification of the 3M squeezing roller is preferably φ180mm * 600mm. The 3M squeezing roller has a porous characteristic and good consistency, which enables the 3M squeezing roller to always maintain close contact with the entire copper strip, and can produce a uniform squeezing effect, obtaining the best squeezing performance; at the same time, the 3M squeezing roller has a relatively high friction coefficient, so an auxiliary motor is not required, and at the same time, a faster production line processing speed can be obtained, enabling the 3M squeezing roller to produce a uniform squeezing effect, squeezing a large amount of residual oil attached to the surface of the copper strip, and removing a large amount of residual oil on the surface of the copper strip. Of course, those skilled in the art can also use 3M squeezing rollers of other specifications, which will not be elaborated here.

[0035] After the copper strip passes through the 3M squeezing roller + air blowing for oil removal after finish rolling, the rolling oil on the surface of the copper strip undergoes squeezing filtration and air blowing evaporation, so that the residual rolling oil on the surface of the copper strip is greatly reduced. Then, through the thick washing process of the copper strip, the residual rolling oil with strong binding force on the surface of the copper strip is saponified and degreased using the degreasing liquid, and then squeezed again by the 3M squeezing roller after degreasing and cleaning, and the copper strip enters the finished product bell annealing process. After the copper strip undergoes finished product annealing, it needs to go through the thin washing process of the copper strip. First, the liquid degreasing liquid completely removes the residual oil on the surface of the copper strip through the principle of similar solubility, is squeezed by the 3M squeezing roller, then undergoes pickling in sequence to remove the oxides generated on the surface of the copper strip during the annealing process, is squeezed by the secondary 3M squeezing roller, and finally passes through the passivation liquid to prevent the oxidation of the copper strip, and passes through the 3M squeezing roller three times to squeeze the residual liquid on the surface of the copper strip.

[0036] In one embodiment of the present application, in the above-mentioned copper strip thick washing step, a solid degreasing agent is added to the cleaning liquid used, preferably the solid degreasing agent is solid degreasing agent K601 and / or CM-082, and the mass concentration of the solid degreasing agent in the cleaning liquid is preferably controlled to be 2-4wt%.

[0037] The residual oil on the surface of the copper strip is caused to undergo a saponification reaction with the solid degreasing liquid that becomes alkaline after dissolution, thereby achieving the effect of removing the residual oil on the surface of the copper strip, thereby improving the cleanliness of the surface of the copper strip. The preferred type and addition amount of the above solid degreasing agent help to further improve the degreasing efficiency and effect of the thick washing step of the copper strip. Specifically, the preferred replacement cycle and addition amount of the solid degreasing agent are once a month. Specifically, it is preferred to thoroughly clean the box during replacement and add 75 kg of solid degreasing agent, and then add 4 kg of solid degreasing agent before production every day. In addition to solid degreasing agent K601 and / or CM-082, other solid degreasing agents commonly used in the art can also be used, which will not be repeated here.

[0038] In one embodiment of the present application, in the above-mentioned copper strip thick washing step, the cleaning liquid is sprayed onto the surface of the copper strip by using a nozzle, and the surface of the copper strip is swept by a cleaning brush at the same time; when the direction of the nozzle spraying the cleaning liquid is opposite to the rotation direction of the cleaning brush, the contact point between the cleaning brush and the surface of the copper strip coincides with the spray point of the nozzle spraying the liquid; when the direction of the nozzle spraying the cleaning liquid is consistent with the rotation direction of the cleaning brush, the liquid sprayed by the nozzle is radially deviated by 5 to 10 degrees to the side of the cleaning brush surface.

[0039] The above setting can make the cleaning liquid have the best flushing angle, thereby maximizing the cleaning effect of the cleaning liquid, improving the comprehensive cleaning ability of the cleaning liquid and the cleaning brush on the copper strip surface, and improving the cleanliness of the copper strip surface.

[0040] In one embodiment of the present application, the finished product annealing step is carried out in a protective gas, the protective gas is an inert gas or nitrogen, preferably nitrogen, the temperature of the finished product annealing step is controlled at 300-350°C, and the flow rate of nitrogen is increased by 18-22% during the insulation stage.

[0041] Controlling the temperature of the finished product annealing step of the weldable copper strip within the above range helps optimize the microstructure of the copper strip. The protective gas helps reduce the probability of oxidation on the copper strip surface during the high-temperature annealing process. At the same time, increasing the flow rate of the protective gas nitrogen by 18-22% during the holding stage helps to remove the oil-containing gas evaporated after the copper strip coil is heated through the nitrogen flow, thereby removing the residual oil on the copper strip surface from the annealing furnace (preferably a copper strip hood annealing furnace), thereby greatly reducing the difficulty of cleaning the residual oil on the copper strip surface, eliminating oxidation spots on the copper strip surface, and improving the surface cleanliness of the weldable copper strip.

[0042] In an embodiment of the present application, in the above-mentioned copper strip thin washing step, a liquid degreasing agent is added to the degreasing solution. Preferably, the liquid degreasing agent is an alkaline liquid degreasing agent K803 and / or K610, and preferably the mass concentration of the liquid degreasing agent in the degreasing solution is controlled to be 4-6 wt%.

[0043] After the copper strip undergoes the finished product annealing step, it is also necessary to carry out the copper strip thin washing process. Adding a liquid degreasing agent to the copper strip thin washing degreasing solution can quickly and effectively clean the residual oil substances on the surface of the copper strip after annealing. In addition, preferably, a flow metering pump for the degreasing solution is added to control the flow rate of the degreasing solution during the copper strip thin washing process. In addition, preferably, the replacement cycle and addition amount of the liquid degreasing agent are once a week, and 75 kg of the liquid degreasing agent is added. 25 kg of the liquid degreasing agent is supplemented before production on the 5th day of each week. When replacing, the box body, pipeline, filter screen, etc. are thoroughly cleaned to improve the purity of the degreasing solution and ensure the degreasing ability of the degreasing solution. In addition to the alkaline liquid degreasing agent K803 and / or CM-082, other commonly used liquid degreasing agents in the art can also be used, which will not be elaborated here.

[0044] To further improve the oil removal effect on the surface of the copper strip, in the copper strip thin washing step, the following operations are preferably carried out:

[0045] Heating up and draining oil treatment: The degreasing solution in the degreasing tank is heated up once every 3 days, and the residual oil floating above the degreasing tank body is subjected to evaporation suction condensation recovery treatment in combination with the oil drainage treatment system, so as to extend the service life of the degreasing solution and increase the cleaning ability of the degreasing solution, thus not only solving the waste of oil products, but also adhering to the green environmental protection production mode.

[0046] Cleaning brush control: The surface quality of the cleaning brushes in the copper strip thick washing step and the copper strip thin washing step is confirmed once every month to ensure the effectiveness of the cleaning brushes and establish the control ability of the cleaning brushes.

[0047] Ultrasonic cleaning: An ultrasonic cleaning process is added to the subsequent process of thin washing cleaning. Thus, by using the energy effect, acceleration effect and rectilinear flow effect of ultrasonic waves in the liquid on the liquid and dirt for direct or indirect ultrasonic cleaning, the dirt layer is dispersed, emulsified and peeled off to achieve the cleaning purpose; furthermore, the oil and dirt impurities attached to the surface of the copper strip can be quickly and thoroughly removed.

[0048] In another typical embodiment of the present application, a TIG welding non-smoking copper strip is provided, and the TIG welding non-smoking copper strip is prepared by the aforementioned production process.

[0049] The smokeless copper strip for argon arc welding obtained through the above production process greatly reduces the residual oil on the surface of the copper strip, improves the surface cleanliness, stabilizes the welding forming process, avoids the phenomenon of skipped welding, and no smoke will appear during the welding process of RF cable production. It will not cause cracking in the subsequent corrugation process, thereby improving the yield rate of RF copper strip and ultimately obtaining qualified RF cables.

[0050] The degreasing step in the production process of the above argon arc welding non-smoking copper strip can be used Figure 1 The device diagram shown is completed. The oil removal device includes a lower base, and a 3M squeezing roller 2, a first air blowing device 3 and a second air blowing device 4 are sequentially arranged along the running direction of the copper strip 1, wherein the 3M squeezing roller 2 has an upper and lower roller, which is fixed on the lower base, and a gap is provided between the upper and lower rollers for the copper strip 1 to pass through. The 3M squeezing roller 2 is used to squeeze out the rolling oil on the copper strip 1; the first air blowing device 3 is used to perform a first purge on the rolling oil on the surface of the copper strip 1 after being squeezed by the 3M squeezing roller 2. The first air blowing device 3 includes a first fixed plate 5, a first movable plate 6 and a bent steel pipe 7. The first fixed plate 5 is fixed on the lower base, the first movable plate 6 is arranged opposite to the first fixed plate 5, and the distance between the first movable plate 6 and the first fixed plate 5 is adjustable. The two ends of the bent steel pipe 7 are fixed to the back of the first movable plate 6 On the side of the M squeezing roller 2, the curved steel pipe 7 is provided with a plurality of first jet holes facing the copper strip 1 at intervals, and the first jet holes are along the axial direction of the first jet hole, and the aperture thereof gradually decreases from the inside to the outside; the second air blowing equipment 4 is used to perform a second purge on the rolling oil on the surface of the copper strip 1 after the first purge, and the second air blowing equipment 4 includes a second fixed plate 8, a second movable plate 9 and a straight steel pipe 10, the second fixed plate 8 is fixed on the lower base, the second movable plate 9 is arranged opposite to the second fixed plate 8, and the distance between the second movable plate 9 and the second fixed plate 8 is adjustable, and the two ends of the straight steel pipe 10 are fixed on the side of the second movable plate 9 facing away from the 3M squeezing roller 2, and the straight steel pipe 10 is provided with a plurality of second jet holes facing the copper strip 1 at intervals, and the second jet holes are along the axial direction of the second jet hole, and the aperture thereof gradually increases from the inside to the outside.

[0051] The 3M squeezing roller 2 has porous characteristics and good consistency, which enables the 3M squeezing roller to always maintain close contact with the entire copper strip, producing a uniform squeezing effect and obtaining the best squeezing performance. At the same time, the 3M squeezing roller has a high coefficient of friction, so an auxiliary motor is not required, and a faster production line processing speed can be obtained. The 3M roller squeezing can produce a uniform squeezing effect to squeeze out a large amount of residual oil adhering to the surface of the copper strip and remove a large amount of residual oil on the surface of the copper strip. Since the structure of the first air jet hole can eject high-pressure air flow, the first air blowing device 3 with the first air jet hole is used to perform the first purge on the surface of the copper strip to reduce the bonding force between the surface of the copper strip and the rolling oil. The structure of the second air jet hole can eject low-pressure air flow, so that the second air blowing device 4 with the second air jet hole performs the second purge on the dispersed rolling oil on the surface of the copper strip after the first purge. Furthermore, through the coordinated cooperation of the first purge and the second purge, the residual oil on the surface of the copper strip is greatly reduced. Then, through the thick washing process of the copper strip, the degreasing liquid is used to saponify and remove the residual rolling oil with a strong bonding force on the surface of the copper strip. After the 3M squeezing roller after degreasing cleaning is squeezed again, the copper strip enters the finished product bell annealing process. After the copper strip undergoes finished annealing, it needs to go through the thin washing process of the copper strip. First, the liquid degreasing liquid completely removes the residual oil on the surface of the copper strip through the principle of similar dissolution. After being squeezed by the 3M squeezing roller, it then undergoes pickling in sequence to remove the oxides generated on the surface of the copper strip during the annealing process, is squeezed by the secondary 3M squeezing roller, and finally passes through the passivation liquid to prevent the oxidation of the copper strip. It passes through the 3M squeezing roller three times to squeeze out the residual liquid on the surface of the copper strip, thereby avoiding the phenomenon of smoking during the production and welding process of the radio frequency cable, obtaining qualified radio frequency cables, and the above equipment is simple and has a low cost.

[0052] In some embodiments of the present application, the included angle between the axis of the above-mentioned first air jet hole and the running direction of the copper strip 1 is controlled to be 2 to 6°, and the included angle gradually increases from the middle to both ends of the bent steel pipe 7.

[0053] The above setting of the included angle between the axis of the first air jet hole and the running direction of the copper strip 1 helps to blow the rolling oil at the middle position on the surface of the copper strip 1 to both sides of the copper strip by the air flow ejected from the first air jet hole, thereby blowing the rolling oil off the surface of the copper strip 1.

[0054] In some embodiments of the present application, the aperture of the above-mentioned first air jet hole gradually decreases from the inside to the outside, from to gradually decreasing, such as from to gradually decreasing, from to gradually decreasing, from to gradually decreasing, or from to gradually decreasing.

[0055] The first air jet holes with the above apertures help to better control the pressure sprayed onto the surface of the copper strip 1 by the first air jet holes within 0.4 to 0.45 MPa, such as 0.4 MPa, 0.41 MPa, 0.42 MPa, 0.43 MPa, 0.44 MPa or 0.45 MPa, and the air volume is controlled to be 15 ± 1 m 3 / h, such as 14 m 3 / h, 14.5 m 3 / h, 15 m 3 / h, 15.5 m 3 / h or 16 m 3 / h, so as to better exert the purging effect of the air flow on the rolling oil on the surface of the copper strip 1.

[0056] In some embodiments of the present application, the minimum vertical distance between the above-mentioned bent steel pipe 7 and the surface of the copper strip 1 is controlled to be 8 to 10 mm, such as 8 mm, 9 mm or 10 mm, so that the air flow has a strong impact force on the surface of the copper strip 1.

[0057] In some embodiments of the present application, the horizontal distance between the above-mentioned first air blowing device 3 and the second air blowing device 4 is controlled to be 19 to 20 cm, such as 19 cm, 19.5 cm or 20 cm, which is conducive to timely sweeping and removing the rolling oil dispersed by the first air blowing device 3.

[0058] In some embodiments of the present application, 28 to 30 first air jet holes are provided on the above-mentioned bent steel pipe 7, such as 28, 29 or 30, and the interval between adjacent first air jet holes is 8 to 9 mm, such as 8 mm, 8.5 mm or 9 mm, which is more conducive to the air flow forming a strong impact force on the surface of the copper strip 1, so as to blow the rolling oil on the surface of the copper strip 1 away from the copper strip surface as much as possible.

[0059] In some embodiments of the present application, the vertical distance between the above-mentioned straight steel pipe 10 and the surface of the copper strip 1 is controlled to be 6 to 8 mm, preferably 6 mm, 7 mm or 8 mm, which helps to control the acting force between the air flow and the surface of the copper strip 1, and gives full play to the entrainment effect of the gas flow on the rolling oil on the surface of the copper strip 1 as much as possible.

[0060] In some embodiments of the present application, 20 to 22 second air jet holes are provided on the above-mentioned straight steel pipe 10, and the interval between adjacent second air jet holes is 14 to 15 mm.

[0061] Controlling the interval between the above-mentioned second air jet holes (such as 14 mm, 14.5 mm or 15 mm) and the number of second air jet holes (such as 20, 21 or 22) helps the gas to be evenly dispersed on the surface of the copper strip 1, so as to take away the rolling oil on the surface of the copper strip 1 through the gas flow and achieve the removal of the rolling oil on the surface of the copper strip 1.

[0062] In an embodiment of the present application, the aperture diameter of the above-mentioned second air jet hole gradually increases from inside to outside, from to gradually increasing, such as preferably from to gradually increasing, from to gradually increasing, from to gradually increasing, or from to gradually increasing.

[0063] The second air jet hole with the above aperture diameter helps to better control the pressure sprayed onto the surface of the copper strip 1 by the second air jet hole within 0.25 - 0.30 MPa (such as 0.25 MPa, 0.26 MPa, 0.27 MPa, 0.28 MPa, 0.29 MPa or 0.30 MPa), and the air volume is controlled at 25 ± 1 m 3 / h (such as 24 m 3 / h, 24.5 m 3 / h, 25 m 3 / h, 25.5 m 3 / h or 26 m 3 / h), so as to better exert the effect of the airflow on removing the rolling oil on the surface of the copper strip 1.

[0064] In an embodiment of the present application, the horizontal distance between the above-mentioned first air blowing device 3 and the 3M squeezing roller 2 is 29 - 30 cm.

[0065] Preferably, the above horizontal distance between the first air blowing device 3 and the 3M squeezing roller 2 (such as 29 cm, 29.5 cm or 30 cm) helps to blow the rolling oil extruded from the copper strip 1 by the 3M squeezing roller 2 away from the surface of the copper strip 1 as soon as possible, reducing the contact time between the extruded rolling oil and the copper strip 1, thereby reducing the probability that the extruded rolling oil is adsorbed by the copper strip again as much as possible, and further improving the oil removal effect.

[0066] In an embodiment of the present application, the axial cross-sections of the above-mentioned first air jet hole and the second air jet hole are both trapezoidal, and the radial cross-sections of the first air jet hole and the second air jet hole are both circular.

[0067] The structure of the first air jet hole with the above shape is relatively regular and uniform, which is more conducive to strongly and uniformly purging the rolling oil on the surface of the copper strip 1 after being squeezed dry by the 3M squeezing roller 2, so as to blow the rolling oil on the surface of the copper strip 1 away from the surface of the copper strip 1 as much as possible, and improve the dispersion of the residual rolling oil on the copper strip 1. And the unified structure of the second air jet hole helps the rolling oil on the surface of the copper strip 1 after the first purging to volatilize evenly, thereby improving the overall removal effect of the rolling oil on the surface of the copper strip 1.

[0068] In an embodiment of the present application, both ends of the above-mentioned first moving plate 6 and the first fixed plate 5, and both ends of the second moving plate 9 and the second fixed plate 8 are independently fixed through telescopic components, and the telescopic components are telescopic bolts.

[0069] Through the above design, the distances between the first air jet hole and the second air jet hole and the copper strip 1 can be flexibly adjusted, so as to better adapt to the process progress for adjustment and control. Among them, the telescopic components can also be other identical or similar components that can replace the telescopic bolts, which will not be elaborated here.

[0070] In an embodiment of the present application, the above-mentioned degreasing device further includes a gas heating device, which is connected to the straight steel pipe 10 and is used to provide hot air flow for the straight steel pipe 10.

[0071] The gas is heated by the gas heating device. Preferably, the temperature of the gas after the heating treatment is controlled to be 50-60°C, so that the gas ejected from the second air jet hole has a certain amount of heat. Using this hot air flow helps to accelerate the volatilization of the rolling oil on the surface of the copper strip 1 after the first purge. Further, preferably, the gas heating device is a small compressed air heater, which has a gas storage tank, and is also equipped with a temperature control knob, a thermometer for controlling the temperature of the stored gas, and a power supply interface, and provides energy for heating the gas through electrical connection.

[0072] In addition, the running speed of the copper strip 1 is reduced from the conventional 300-320 m / min in the prior art to 260-280 m / min (such as 260 m / min, 270 m / min or 280 m / min), which is more conducive to exerting the above degreasing effect and reducing the residual oil amount on the surface of the copper strip 1 after coiling.

[0073] The beneficial effects of the present application will be further described below in conjunction with embodiments.

[0074] Embodiment 1

[0075] After weighing and batching, it is successively passed through the horizontal continuous casting step, surface milling step, rough rolling step, thick shearing step, intermediate annealing step, finish rolling step, thick washing step of copper strip, finish annealing step, thin washing step of copper strip, finish slitting, finish inspection, and finish packaging to obtain an argon arc welding non-smoking copper strip.

[0076] Horizontal continuous casting: The function of the horizontal continuous casting process is to melt high-quality grade A cathode copper into a 17 mm * 445 mm (thickness * width) specification billet by electrolysis within the temperature range of 1145°C to 1180°C.

[0077] Surface Milling: The continuously cast billets are milled on both the upper and lower sides horizontally, with the milling amount controlled within the range of 0.4 - 0.85 mm to mill off the defects on the surface of the strip blank, providing a good strip blank for cold rolling.

[0078] Rough Rolling: The function of the rough rolling process for copper strips is to roll the copper strips after surface milling in the thickness direction. After 9 - 10 passes of cold rolling, the thickness is reduced from the original 17 mm to an intermediate material of 0.7 mm or 0.5 mm.

[0079] Thick Edge Trimming: The main function of the thick edge trimming process is to trim the edges of the copper strips after rough rolling, removing the casting and rolling crack defects on both sides of the copper strips, and trimming the width from 445 mm to 425 mm.

[0080] Intermediate Annealing: After cold rolling, the copper coils are work - hardened. It is necessary to perform intermediate annealing in a bell - type protective gas annealing furnace to eliminate the work - hardening generated during cold rolling and restore the plasticity of the metal so as to continue cold rolling and further reduce the thickness of the strip. Therefore, the intermediate annealing process is required.

[0081] Finish Rolling: The intermediate material after intermediate annealing is directly rolled to the finished thickness by a four - high finish rolling mill. During the last finish rolling pass, air - blowing oil removal steps (the first purge and the second purge) are carried out in sequence; among them, the running speed of the copper strip is 280 m / min, the pressure of the first purge is 0.4 MPa, the air volume of the first purge is 15 m 3 / h, the pressure of the second purge is 0.25 MPa, the air volume of the second purge is 25 m 3 / h, the air temperature of the second purge is 60 °C. Specifically, a sharp - corner fine - hole pressurized air - blowing device is used to purge the surface of the copper strip to reduce the adhesion force between the surface of the copper strip and the rolling oil. During the entire finish rolling step, the viscosity of the rolling oil is controlled at 6.0 mm 2 / s.

[0082] Edge Oil Absorption Treatment: The residual oil on both sides of the copper coil after finish rolling is suctioned by a wet - dry vacuum cleaner with a capacity of 30 L, a power of 1400 W, a vacuum degree of 20 KPA, and a suction force of 19000 Pa. The rolling oil is removed through the wet function to reduce the oil content in the copper coil.

[0083] Thick Strip Cleaning: The rolling oil on the surface of the copper strip after finish rolling is mainly cleaned and then dried with a cleaning liquid. Specifically, the cleaning liquid is sprayed onto the surface of the copper strip using a nozzle, and at the same time, a cleaning brush is used to brush the surface of the copper strip; the spraying direction of the cleaning liquid from the nozzle is opposite to the rotation direction of the cleaning brush, and the contact point between the cleaning brush and the surface of the copper strip coincides with the liquid - spraying point of the nozzle. Among them, the drying roller is a 3M squeezing roller with a specification of φ180 mm * 600 mm, and the cleaning liquid includes solid degreasing agent K601 and CM - 082, and the mass concentration of solid degreasing agent K601 is 3 wt%.

[0084] Final annealing: In a nitrogen atmosphere, control the temperature at 320 °C, keep the heat preservation time for 3 h, and increase the nitrogen flow rate by 20% during the heat preservation stage to control the product state (performance), maintain uniform performance, eliminate uneven stress, eliminate the adhesion on the surface of the copper strip, ensure the flatness of the strip, and achieve the required performance state.

[0085] Thin cleaning of copper strip: Use a degreasing solution to degrease and clean the residual oil on the surface of the copper strip after final annealing. The cleaning solution includes alkaline liquid degreasing agents K803 and K610. The mass concentration of alkaline liquid degreasing agent K803 is 5 wt%. At the same time, remove the oxidation spots on the surface of the copper strip through pickling, and finally perform passivation treatment on the surface of the copper strip with a passivation solution to improve the antioxidant performance of the copper strip.

[0086] Thin shearing of copper strip: Cut the copper strip after thin cleaning of the finished product according to the width required by the customer to produce finished copper strips that meet the customer's requirements.

[0087] Example 2

[0088] The difference from Example 1 is that a one-step air blowing and oil removal step is carried out at 0.25 MPa.

[0089] Example 3

[0090] The difference from Example 1 is that the pressure of the first purge is 0.45 MPa and the pressure of the second purge is 0.30 MPa.

[0091] Example 4

[0092] The difference from Example 1 is that the pressure of the first purge is 0.20 MPa and the pressure of the second purge is 0.10 MPa.

[0093] Example 5

[0094] The difference from Example 1 is that in the finish rolling step, the viscosity of the rolling oil is controlled at 7.0 mm 2 / s.

[0095] Example 6

[0096] The difference from Example 1 is that in the finish rolling step, the viscosity of the rolling oil is controlled at 5.0 mm 2 / s.

[0097] Example 7

[0098] The difference from Example 1 is that in the finish rolling step, the viscosity of the rolling oil is controlled at 8.0 mm 2 / s.

[0099] Example 8

[0100] The difference from Example 1 is that the edge oil absorption treatment is not carried out.

[0101] Example 9

[0102] The difference from Example 1 lies in that in the edge oil suction treatment step, the residual oil on both sides of the copper coil after the finish rolling and coiling is sucked by a wet and dry vacuum cleaner with a capacity of 35L, a power of 1450W, a vacuum degree of 22KPA and a suction force of 20000Pa. The rolling oil is removed through the wet function to reduce the oil content of the copper coil.

[0103] Example 10

[0104] The difference from Example 1 lies in that in the thick washing step of the copper strip, an ordinary squeezing roller is used, the material of which is rubber, the model is A01, and the specification is φ1800mm*600mm.

[0105] Example 11

[0106] The difference from Example 1 lies in that in the thick washing step of the copper strip, the mass concentration of the solid degreasing agent in the cleaning liquid is 2wt%.

[0107] Example 12

[0108] The difference from Example 1 lies in that in the thick washing step of the copper strip, the mass concentration of the solid degreasing agent in the cleaning liquid is 4wt%.

[0109] Example 13

[0110] The difference from Example 1 lies in that in the thick washing step of the copper strip, the mass concentration of the solid degreasing agent in the cleaning liquid is 1wt%.

[0111] Example 14

[0112] The difference from Example 1 lies in that in the thick washing step of the copper strip, the direction of the cleaning liquid sprayed by the nozzle is the same as the rotation direction of the cleaning brush, and the sprayed liquid of the nozzle is deflected 5° closer to the surface side of the cleaning brush in the radial direction.

[0113] Example 15

[0114] The difference from Example 1 lies in that in the thick washing step of the copper strip, the direction of the cleaning liquid sprayed by the nozzle is the same as the rotation direction of the cleaning brush, and the sprayed liquid of the nozzle is deflected 10° closer to the surface side of the cleaning brush in the radial direction.

[0115] Example 16

[0116] The difference from Example 1 lies in that in the thick washing step of the copper strip, the direction of the cleaning liquid sprayed by the nozzle is the same as the rotation direction of the cleaning brush, and the sprayed liquid of the nozzle is deflected 0° closer to the surface side of the cleaning brush in the radial direction.

[0117] Example 17

[0118] The difference from Example 1 is that in the thick copper strip washing step, the direction of the cleaning liquid sprayed by the nozzle is the same as the rotation direction of the cleaning brush, and the sprayed liquid from the nozzle is deflected 15° closer to the surface side of the radial cleaning brush.

[0119] Example 18

[0120] The difference from Example 1 is that the temperature of the finished product annealing is controlled at 350 °C and the holding time is 3 h.

[0121] Example 19

[0122] The difference from Example 1 is that the flow rate of nitrogen is increased by 21% during the holding stage.

[0123] Example 20

[0124] The difference from Example 1 is that the flow rate of nitrogen is increased by 10% during the holding stage.

[0125] Example 21

[0126] The difference from Example 1 is that the flow rate of nitrogen remains unchanged during the holding stage.

[0127] Example 22

[0128] The difference from Example 1 is that in the thin copper strip washing step, the mass concentration of the solid degreasing agent in the cleaning liquid is 4 wt%.

[0129] Example 23

[0130] The difference from Example 1 is that in the thin copper strip washing step, the mass concentration of the solid degreasing agent in the cleaning liquid is 6 wt%.

[0131] Example 24

[0132] The difference from Example 1 is that in the thin copper strip washing step, the mass concentration of the solid degreasing agent in the cleaning liquid is 2 wt%.

[0133] Example 25

[0134] The difference from Example 1 is that the running speed of the copper strip is 300 m / min.

[0135] Example 26

[0136] The difference from Example 1 is that the air flow temperature of the second purge is 40 °C.

[0137] Example 27

[0138] After weighing and batching, it successively goes through the horizontal continuous casting step, surface milling step, rough rolling step, thick shearing step, intermediate annealing step, finish rolling step, thick washing step of copper strip, finish annealing step, thin washing step of copper strip, finish slitting, finish inspection, and finish packaging to obtain the non-smoking copper strip for TIG welding.

[0139] Horizontal continuous casting: The function of the horizontal continuous casting process is to melt high-quality Grade A cathode copper into a billet with a specification of 17mm * 445mm (thickness * width) by electrolysis within the temperature range of 1145°C to 1180°C.

[0140] Surface milling: The horizontally continuously cast billet is milled on both the upper and lower sides, and the milling amount is controlled within the range of 0.4 - 0.85mm to mill off the defects on the surface of the strip billet and provide a good strip billet for cold rolling.

[0141] Rough rolling: The function of the copper strip rough rolling process is to roll the surface-milled copper strip in the thickness direction. After 9 - 10 passes of cold rolling, the thickness is reduced from the original 17mm to an intermediate material of 0.7mm or 0.5mm.

[0142] Thick shearing: The main function of the thick shearing process is to trim the edges of the rough-rolled copper strip, removing the casting and rolling crack defects on both sides of the copper strip, and trimming the width from 445mm to 425mm.

[0143] Intermediate annealing: After cold rolling, the material of the copper coil undergoes work hardening and needs to be annealed in a bell-type protective gas annealing furnace to eliminate the work hardening generated during cold rolling, restore the plasticity of the metal, and continue cold rolling to further reduce the thickness of the strip. Therefore, the intermediate annealing process is required.

[0144] Finish rolling: The intermediate material after intermediate annealing is directly rolled to the finish thickness by a four-high finish rolling mill. In the last pass of finish rolling, the following operations are carried out in sequence according to the device shown in Figure 1 the device shown, including a 3M squeezing roller and air blowing for oil removal steps (the first purge and the second purge);

[0145] In the last pass of finish rolling, part of the device for oil removal is as shown in Figure 1 the figure. This oil removal device includes a lower base, and along the running direction of the copper strip 1 (running speed is 280m / min), there are successively arranged a 3M squeezing roller 2, a first air blowing device 3, and a second air blowing device 4.

[0146] Among them, the 3M squeezing roller 2 has upper and lower rollers, which are fixed on the lower base. There is a gap between the upper and lower rollers for the copper strip 1 to pass through. The 3M squeezing roller 2 is used to squeeze out the rolling oil on the copper strip 1; the first air blowing device 3 is used to perform the first purge on the rolling oil on the surface of the copper strip 1 after being squeezed by the 3M squeezing roller 2. The pressure of the first purge is controlled at 0.45MPa, and the air volume is controlled at 15m 3 / h, the horizontal distance between the first air-blowing device 3 and the 3M squeezing roller 2 is 30 cm. The first air-blowing device 3 includes a first fixed plate 5, a first moving plate 6, and a bent steel pipe 7. The first fixed plate 5 is fixed to the lower base. The first moving plate 6 is arranged opposite to the first fixed plate 5, and the first moving plate 6 is fixed relative to the first fixed plate 5 by a telescopic bolt. Both ends of the bent steel pipe 7 are fixed to the side of the first moving plate 6 facing away from the 3M squeezing roller 2. The minimum vertical distance between the bent steel pipe 7 and the surface of the copper strip 1 is 10 mm. The bent steel pipe 7 is provided with 30 first air nozzles facing the copper strip 1 at intervals, and the interval between adjacent first air nozzles is 9 mm. The axial section of the first air nozzle is trapezoidal, and the radial section of the first air nozzle is circular. Along the axis of the first air nozzle, the aperture of the first air nozzle gradually decreases from towards and gradually decreases. The included angle between the axis of the first air nozzle and the running direction of the copper strip 1 is 2 - 6°, and the included angle gradually increases from the middle to both ends of the bent steel pipe 7.

[0147] The second air-blowing device 4 is used to perform a second purge on the rolling oil on the surface of the copper strip 1 after the first purge. The pressure of the second purge is controlled at 0.25 MPa, and the air volume is controlled at 25 m 3 / h. The second air-blowing device 4 includes a second fixed plate 8, a second moving plate 9, and a straight steel pipe 10. The second fixed plate 8 is fixed to the lower base. The second moving plate 9 is arranged opposite to the second fixed plate 8, and the distance between the second moving plate 9 and the second fixed plate 8 is adjustable. Both ends of the straight steel pipe 10 are fixed to the side of the second moving plate 9 facing away from the 3M squeezing roller 2. The vertical distance between the straight steel pipe 10 and the surface of the copper strip 1 is 8 mm. The straight steel pipe 10 is connected to a small compressed air heater so that the temperature of the air flow coming out of the second air nozzle is 60°C. The straight steel pipe 10 is provided with 22 second air nozzles facing the copper strip 1 at intervals, and the interval between adjacent second air nozzles is 15 mm. The axial section of the second air nozzle is trapezoidal, and the radial section of the second air nozzle is circular. Along the axis of the second air nozzle, its aperture gradually increases from towards and gradually increases.

[0148] The horizontal distance between the first air-blowing device 3 and the second air-blowing device 4 is 20 cm.

[0149] During the entire finish rolling step, the viscosity of the rolling oil is controlled at 6.0 mm 2 / s.

[0150] Edge oil suction treatment: The residual oil on both sides of the copper coil after finish rolling is sucked by a wet and dry vacuum cleaner with a capacity of 30 L, a power of 1400 W, a vacuum degree of 20 KPA, and a suction force of 19000 Pa. The rolling oil is sucked out through the wet function to reduce the oil content of the copper coil.

[0151] Thick strip cleaning: mainly, the rolling oil on the surface of the copper strip after the finish rolling and coiling is cleaned with a cleaning liquid and then dried. Specifically, the cleaning liquid is sprayed onto the surface of the copper strip using a nozzle, and at the same time, the surface of the copper strip is brushed with a cleaning brush; the direction of the cleaning liquid sprayed by the nozzle is opposite to the rotation direction of the cleaning brush, and the contact point between the cleaning brush and the surface of the copper strip coincides with the liquid spraying point of the nozzle. Among them, the drying roller has a specification of 3M squeezing rollers, and the cleaning liquid includes solid degreasing agent K601 and CM-082, and the mass concentration of the solid degreasing agent K601 is 3 wt%.

[0152] Final annealing: In a nitrogen atmosphere, the temperature is controlled at 320 °C, and the holding time is 3 h. During the holding stage, the flow rate of nitrogen is increased by 20% to control the product state (performance), keep the performance uniform, eliminate uneven stress, eliminate the adhesion on the surface of the copper strip, ensure the flatness of the strip, and achieve the required performance state.

[0153] Thin strip cleaning of copper strip: The residual oil on the surface of the copper strip after final annealing is degreased and cleaned with a degreasing liquid. The cleaning liquid includes alkaline liquid degreasing agents K803 and K610, and the mass concentration of the alkaline liquid degreasing agent K803 is 5 wt%. At the same time, the oxidation spots on the surface of the copper strip are removed by pickling, and finally, the surface of the copper strip is passivated with a passivation liquid to improve the oxidation resistance of the copper strip.

[0154] Thin cutting of copper strip: The copper strip after thin strip cleaning of the finished product is cut according to the width required by the customer to produce the finished copper strip that meets the customer's requirements.

[0155] Example 28

[0156] The difference from Example 27 is that the included angle between the axial direction of the first air injection hole and the running direction of the copper strip 1 is 1 - 3°.

[0157] Example 29

[0158] The difference from Example 27 is that the minimum vertical distance between the bent steel pipe 7 and the surface of the copper strip 1 is 12 mm.

[0159] Example 30

[0160] The difference from Example 27 is that the horizontal distance between the first air blowing device 3 and the second air blowing device 4 is 22 cm.

[0161] Example 31

[0162] The difference from Example 27 is that there are 28 first air injection holes provided on the bent steel pipe 7, and the interval between adjacent first air injection holes is 8 mm.

[0163] Example 32

[0164] The difference from Example 27 is that the vertical distance between the straight steel pipe 10 and the surface of the copper strip 1 is 10 mm.

[0165] Example 33

[0166] The difference from Example 27 is that 20 second air jet holes are provided on the straight steel pipe 10, and the interval between adjacent second air jet holes is 14 mm.

[0167] Example 34

[0168] The difference from Example 27 is that the horizontal distance between the first air blowing device 3 and the 3M squeezing roller 2 is 32 cm.

[0169] Comparative Example 1

[0170] The difference from Example 1 is that the air blowing and oil removal step is not carried out in the finish rolling step.

[0171] Comparative Example 2

[0172] The difference from Example 27 is that in the first air blowing device 3, a straight steel pipe (the included angle between the axial direction of the first air jet hole and the running direction of the copper strip 1 is 0°) is used to replace the bent steel pipe 7.

[0173] Comparative Example 3

[0174] The difference from Example 27 is that there is no second air blowing device 4.

[0175] Using a No. 30 dyno pen, the residual oil amount on the surface of the final copper strips obtained in Examples 1 to 34 and Comparative Examples 1 to 3 was tested at room temperature. The residual oil amount on the surface of the copper strip was determined according to the time when the copper strip showed slight shrinkage, and the test results are listed in Table 1.

[0176] Table 1

[0177]

[0178]

[0179] The final copper strips obtained in Examples 1 to 34 and Comparative Examples 1 to 3 were used for the production welding of radio frequency cables. It was found that the copper strips in Examples 1 to 34 did not show any smoking phenomenon, and no cracking occurred during the subsequent grooving process, and finally qualified radio frequency cables were obtained. The copper strips in Comparative Examples 1 to 3 showed serious smoking phenomena, and cracking occurred during the subsequent grooving process, making it impossible to produce radio frequency cables.

[0180] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0181] The viscosity of the rolling oil in the finishing step is relatively high, and the adhesion between the copper strip and the rolling oil is relatively strong. The present application adds an air-blowing oil removal step in the finishing step, and utilizes the strong blowing effect under the above pressure conditions to remove the residual oil on the surface of the copper strip as much as possible, so that the residual oil on the copper coil after finishing rolling is relatively small, so that the residual oil on the surface of the copper strip obtained after the simple copper strip thick washing step and the copper strip thin washing step is very small, thereby improving the cleanliness of the copper strip surface, stabilizing the welding forming process, avoiding the phenomenon of skipped welding, and no smoking will occur during the welding process of RF cable production, and no cracking will occur during the subsequent corrugation process, thereby improving the yield rate of RF copper strip and finally obtaining qualified RF cables. On the other hand, the consumption of cleaning fluid used in the copper strip thick washing step and the copper strip thin washing step is reduced, thereby reducing costs.

[0182] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production process of non-smoking copper strip for argon arc welding, comprising: Horizontal continuous casting step, surface milling step, rough rolling step, thick shearing step, intermediate annealing step, finish rolling step, thick washing step of copper strip, finish annealing step, and thin washing step of copper strip, characterized in that an air blowing and oil removal step is included in the finish rolling step; The air blowing and oil removal step is carried out in the last finish rolling of the finish rolling step; The air blowing and oil removal step includes a first purge and a second purge. Among them, the running speed of the copper strip is 260-280 m / min, the pressure of the first purge is 0.4-0.45 MPa, the pressure of the second purge is 0.25-0.30 MPa, and the air flow temperature of the second purge is 50-60 °C; The air volume of the first purge is 15±1 m 3 / h, and the air volume of the second purge is 25±1 m 3 / h; In the finish rolling step, the viscosity of the rolling oil is controlled between 5.0 and 7.0 mm 2 / s.

2. The production process according to claim 1, characterized in that, The residual oil on both sides of the copper coil after the finish rolling step and coiling is sucked and treated, and the sucking and treating is carried out by a wet and dry vacuum cleaner.

3. The production process according to claim 2, characterized in that, Control the capacity of the wet and dry vacuum cleaner to be 30-35 L.

4. The production process according to claim 2, characterized in that, The power of the wet and dry vacuum cleaner is 1400-1450 W.

5. The production process according to claim 2, characterized in that, The vacuum degree of the wet and dry vacuum cleaner is 20-22 KPa.

6. The production process according to claim 2, characterized in that, The suction force of the wet and dry vacuum cleaner is 19000-20000 Pa.

7. The production process according to any one of claims 1 to 6, characterized in that, The squeezing rollers used in the thick washing step and the thin washing step of the copper strip are independently 3M squeezing rollers.

8. The production process according to claim 7, characterized in that, The specification of the 3M squeezing roller is φ180mm*600mm.

9. The production process according to any one of claims 1 to 6, characterized in that, In the thick washing step of the copper strip, a solid degreasing agent is added to the cleaning liquid used.

10. The production process according to claim 9, characterized in that, The solid degreasing agent is solid degreasing agent K601 and / or CM-082.

11. The production process according to claim 9, characterized in that, Control the mass concentration of the solid degreasing agent in the cleaning liquid to be 2-4 wt%.

12. The production process according to claim 9, characterized in that, In the thick washing step of the copper strip, the cleaning liquid is sprayed onto the surface of the copper strip by a nozzle, and at the same time, the surface of the copper strip is brushed by a cleaning brush; when the direction of spraying the cleaning liquid by the nozzle is opposite to the rotation direction of the cleaning brush, the contact point between the cleaning brush and the surface of the copper strip coincides with the liquid spraying point of the nozzle spraying; when the direction of spraying the cleaning liquid by the nozzle is the same as the rotation direction of the cleaning brush, the liquid spraying radius of the nozzle spraying is deflected 5-10° to the side of the cleaning brush surface.

13. The production process according to any one of claims 1 to 6, characterized in that, The finish annealing step is carried out in a protective gas, the protective gas is an inert gas or nitrogen, and the temperature of the finish annealing step is controlled at 300-350 °C, and the flow rate of the nitrogen is increased by 18-22% during the holding stage.

14. The production process according to any one of claims 1 to 6, characterized in that, In the thin washing step of the copper strip, a liquid degreasing agent is added to the degreasing liquid used.

15. The production process according to claim 14, wherein The liquid degreasing agent is alkaline liquid degreasing agent K803 and / or K610.

16. The production process according to claim 14, characterized in that, Control the mass concentration of the liquid degreasing agent in the degreasing liquid to be 4-6 wt%.

17. An argon arc welding non-smoking copper strip, characterized in that, The non-smoking copper strip for argon arc welding is prepared by the production process according to any one of claims 1 to 16.

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