Processing technology of oxygen-free copper pipe for magnetic control anode cylinder

Abstract

The invention relates to the technical field of non-ferrous metallurgy, and discloses a processing technology of an oxygen-free copper pipe for a magnetic control anode cylinder, which comprises the following steps: selecting a copper ingot with the copper content of 99.97%-100% as a raw material, putting the copper ingot into a vacuum electric furnace, heating and melting to form a copper liquid, extruding the smelted copper liquid into a copper pipe blank by using a pressurizing machine, and carrying out heat treatment on the copper pipe blank to obtain the oxygen-free copper pipe for the magnetic control anode cylinder. The method comprises the following steps: placing a copper pipe blank at an inlet of a two-roller Picker mill, carrying out primary rolling by using the two-roller Picker mill, carrying out annealing, solution treatment and aging treatment on the rolled copper pipe, cutting the copper pipe by adopting a chipless sawing technology according to requirements, cleaning the cut copper pipe, and bending the copper pipe by using a pipe bending machine according to the required bending degree, according to the method, the bent copper pipe is subjected to surface treatment of polishing and sand blasting, and whole-course intelligent online quality monitoring is implemented in the production process, including quality detection and regular sampling detection by an online detector, drying treatment by a drying oven, and size detection, mechanical property test and appearance inspection on the finished copper pipe.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a processing technology of an oxygen-free copper tube for a magnetron anode cylinder. Background Art

[0002] In the traditional copper tube processing technology, especially for the production of oxygen-free copper tubes for magnetron anode cylinders with high precision requirements, there are many challenges. First, traditional processes often find it difficult to achieve high purity requirements, resulting in insufficient copper content in the product, which directly affects the conductivity and overall quality of the copper tube. Secondly, due to technical limitations, the copper tubes produced by traditional processing methods have a high oxygen content, which not only reduces the purity of the copper tube, but also may introduce impurity elements, affecting its physical and chemical properties, especially in application scenarios with strict requirements on oxygen content. Furthermore, the traditional process has low precision in dimensional control, and the deviations in outer diameter, inner diameter and wall thickness are large, which cannot meet the strict requirements of high-precision equipment such as magnetron anode cylinders on the size of copper tubes. These factors combined limit the application potential of traditional copper tube processing technology in the high-end market. Therefore, the development of a copper tube processing technology that can simultaneously solve the problems of low copper content, high oxygen content and insufficient precision has become a technical problem that needs to be broken through in the industry. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] In view of the shortcomings of the prior art, the present invention provides a processing technology for oxygen-free copper tubes for magnetron anode cylinders, which has the advantages of high copper content, low oxygen content and sufficient precision, and solves the problems of low copper content, high oxygen content and insufficient precision of copper tubes produced by traditional processing methods.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: a processing technology of an oxygen-free copper tube for a magnetron anode cylinder, comprising the following steps:

[0007] Step 1: Raw material preparation: Select copper ingots with a copper content of 99.97%-100% as raw materials;

[0008] Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid;

[0009] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0010] Step 4, rolling: Place the copper tube blank at the entrance of the two-roller Piger mill, use the two-roller Piger mill for preliminary rolling, reduce the wall thickness of the copper tube by reducing the roll gap by 0.23mm±0.0015mm each time, while maintaining the circular cross-section of the copper tube, and roll the copper tube alternately between the two-roller Piger mill and the four-roller mill for 5-8 passes;

[0011] Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube;

[0012] Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed;

[0013] Step 7: Cleaning: Clean the cut copper tube;

[0014] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree;

[0015] Step 9: Surface treatment: Polishing and sandblasting the bent copper tube;

[0016] Step 10: Quality control: Implement full-process intelligent online quality monitoring during the production process, including quality testing by online detectors and regular sampling tests;

[0017] Step 11, post-processing: drying in an oven;

[0018] Step 12: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

[0019] Preferably, the vacuum furnace smelting conditions in step 2 are set as follows: the vacuum degree is controlled at 70-95 Pa, the smelting temperature is controlled at 1175° C.-1190° C., the holding time is controlled at 0.95-1.2 h, and the electromagnetic field current intensity is controlled at 60A-70A.

[0020] Preferably, the vacuum furnace solidification conditions in step 2 are set as follows: the pulling speed is controlled at 110-115 mm / min, the temperature of the cooling water is controlled at 30° C.-35° C., and the vacuum degree is maintained at 70-95 Pa.

[0021] Preferably, in step three, the parameters of the press are set as follows: the extrusion pressure is controlled at 250-300 MPa, the extrusion temperature is controlled at 900° C.-1000° C., and the extrusion speed is controlled at 8-10 m / min.

[0022] Preferably, in the step 4, the setting process of thinning the wall thickness of the copper tube by reducing the roll gap by 0.23mm±0.0015mm each time is as follows: the wall thickness of the copper tube blank is 2mm, the target wall thickness of the copper tube is 0.15mm, the total reduction is 1.85mm, and the target size is reached through 8 rolling passes, so the average reduction per rolling is 0.23mm.

[0023] Preferably, the conditions for 5-8 rolling passes in step 4 are: pressure controlled at 300-310 MPa, processing rate controlled at 76%-77%, temperature controlled at 25-30°C, and rolling speed controlled at 50 mm / min-55 mm / min.

[0024] Preferably, the annealing process in step five is: using a box furnace for annealing, setting the annealing temperature between 450° C. and 650° C., setting the holding time to 2.5-3.5 hours, and selecting air cooling for cooling.

[0025] Preferably, the solution treatment process in step five is: select a continuous solution treatment furnace for solution treatment, control the solution temperature at 800°C-900°C, control the holding time at 30min-45min, and select water cooling for cooling.

[0026] Preferably, the aging treatment process in step 5 is: selecting a box-type furnace for aging treatment, controlling the aging temperature at 200°C-300°C, controlling the insulation time at 3-5h, and selecting a natural temperature cooling method for cooling.

[0027] Preferably, the sandblasting conditions in step nine are: selecting corundum as the sandblasting material, controlling the compressed air pressure at 0.20-0.25 MPa, and controlling the distance between the sandblasting gun and the surface of the copper tube to be 15-20 cm.

[0028] Compared with the prior art, the present invention provides a processing technology for an oxygen-free copper tube for a magnetron anode cylinder, which has the following beneficial effects:

[0029] 1. The present invention ensures a high copper content in the copper tube by using high-purity copper ingots (99.97% to 99.98%) as raw materials, thereby improving the conductivity and corrosion resistance of the steel tube. At the same time, the vacuum furnace is used for smelting, which can effectively reduce the oxygen content in the copper liquid, further enhance the corrosion resistance of the copper tube, and help maintain the high purity of copper.

[0030] 2. The present invention controls the roll gap parameters and adopts multiple rolling passes alternately performed by a two-roller pigeon mill and a four-roller mill during the rolling process. This rolling method helps to maintain the uniformity of the wall thickness of the copper tube and the stability of the circular cross-section. The annealing, solution treatment and aging treatment in the heat treatment stage can ensure the optimization of the internal structure of the copper tube, further improve the mechanical properties of the copper tube, and also make the copper tube reach the best standard in dimensional accuracy, which helps to improve the accuracy of the process and the consistency of the finished steel tube.

[0031] 3. The present invention realizes real-time monitoring of the entire process flow through the use of an intelligent online quality monitoring system, which is helpful to the stability of the quality of the finished steel pipe. The polishing and sandblasting surface treatment process of the copper pipe can not only remove slight defects on the surface of the steel pipe, but also improve the appearance quality of the copper pipe, so that it can meet the "defect-free" standard in the appearance inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 The processing technology of oxygen-free copper tube for magnetron anode cylinder includes the following steps:

[0035] Step 1. Raw material preparation: Select copper ingots with a copper content of 99.97%-100% as raw materials (selecting copper ingots of this purity as raw materials can ensure that the copper content of the raw materials themselves is close to 99.97% or more, thereby improving the purity of the final product from the source);

[0036] Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid (while using the vacuum electric furnace, adding an appropriate amount of charcoal to cover it to isolate the oxygen in the air, thereby reducing the oxygen content of the copper tube and increasing the copper content);

[0037] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0038] Step 4, rolling: Place the copper tube blank at the entrance of the two-roller Piger mill (make sure that the copper tube blank is aligned with the rollers), use the two-roller Piger mill for preliminary rolling, reduce the wall thickness of the copper tube by reducing the roll gap by 0.23mm±0.0015mm each time, while maintaining the circular cross-section of the copper tube, and roll the copper tube alternately between the two-roller Piger mill and the four-roller mill for 5-8 passes until the copper tube reaches the required wall thickness and dimensional accuracy (improve processing accuracy to reduce oxidation and uneven deformation of materials during processing, and further ensure the dimensional accuracy and surface quality of the copper tube);

[0039] Step 5, heat treatment: annealing the rolled copper tube (annealing refers to heating the copper tube to a certain temperature and keeping it warm for a period of time and then cooling it to room temperature to eliminate stress, improve plasticity, reduce hardness, and improve processing performance and mechanical properties), solution treatment (solution treatment refers to heating the processed copper tube to the solution temperature and keeping it warm for a period of time and then cooling it rapidly to eliminate the solute atoms in the solid solution and improve the strength and hardness of the alloy), aging treatment (aging treatment refers to heating the copper tube after solution treatment to the aging temperature again and keeping it warm for a period of time and then cooling it to make the precipitation phase reach the best state and improve the strength and hardness of the alloy);

[0040] Step 6. Cutting: Use chipless sawing technology to cut the copper tube as needed to ensure a smooth cutting surface;

[0041] Step 7: Cleaning: Clean the cut copper tube to remove impurities and oil stains on the surface and keep the tube wall clean;

[0042] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree to avoid cracks and deformation of the pipe wall;

[0043] Step 9, surface treatment: polishing and sandblasting the bent copper tube (polishing is to grind the surface of the copper tube by abrasives and polishing machinery to make it bright and smooth; while sandblasting is to spray sand particles onto the surface of the copper tube by compressed air to change its surface morphology);

[0044] Step 10: Quality control: Implement intelligent online quality monitoring throughout the production process, including quality testing with online detectors and regular sampling tests to ensure that every link meets high standards;

[0045] Step 11: Post-processing: Dry the copper tube in an oven to remove residual moisture, ensure the dry state of the copper tube, and avoid oxidation during storage or transportation;

[0046] Step 12: Finished product inspection: Conduct size inspection, mechanical property test and appearance inspection on the finished copper tubes to ensure that each copper tube meets the quality standards.

[0047] Specifically, the vacuum furnace smelting conditions in step 2 are set as follows: the vacuum degree is controlled at 70-95 Pa (to reduce the mixing of oxygen and other impurities), the smelting temperature is controlled at 1175°C-1190°C (to ensure that the copper ingot can be fully melted and achieve appropriate fluidity), the holding time is controlled at 0.95-1.2h (to ensure the uniformity of the copper liquid and the temperature stability), and the electromagnetic field current intensity is controlled at 60A-70A (to improve the smelting efficiency and optimize the smelting process).

[0048] Specifically, in step 2, the vacuum furnace solidification conditions are set as follows: the pulling speed is controlled at 110-115 mm / min (to ensure continuous forming and dimensional accuracy of the copper tube), the temperature of the cooling water is controlled at 30° C.-35° C. (to ensure that the copper tube can be effectively cooled and at an appropriate cooling rate during the solidification process, thereby affecting the microstructure and performance of the copper tube), and the vacuum degree is maintained at 70-95 Pa (to maintain the purity of the copper liquid).

[0049] Specifically, the parameters of the press in step three are set as follows: the extrusion pressure is controlled at 250-300 MPa (this pressure range ensures that the copper liquid can fully fill the mold during the extrusion process to form a copper tube with high density, smooth surface and precise size), the extrusion temperature is controlled between 900°C and 1000°C (to ensure that the copper liquid has good fluidity and plasticity), and the extrusion speed is controlled at 8-10 m / min (the extrusion speed will be relatively slow to ensure that the material can flow evenly in the mold and fill every part of the mold).

[0050] Specifically, in step 4, the setting process of thinning the copper tube wall thickness by reducing the roll gap by 0.23mm±0.0015mm each time is as follows: the wall thickness of the copper tube blank is 2mm, the target wall thickness of the copper tube is 0.15mm, the total reduction is 1.85mm, and the target size is achieved through 8 rolling passes, so the average reduction per rolling is 0.23mm.

[0051] Specifically, the conditions for 5-8 passes of rolling in step 4 are: pressure controlled at 300-310 MPa, processing rate controlled at 76%-77%, temperature controlled at 25-30° C., and rolling speed controlled at 50 mm / min-55 mm / min.

[0052] Specifically, the annealing process in step five is: use a box furnace for annealing, set the annealing temperature between 450°C and 650°C, set the insulation time to 2.5-3.5h, and choose air cooling to ensure that the copper tube is evenly heated during the heating and cooling process.

[0053] Specifically, the solution treatment process in step five is: select a continuous solution treatment furnace for solution treatment, control the solution temperature at 800°C-900°C, control the insulation time at 30min-45min, and select water cooling for cooling to achieve rapid and uniform heating and rapid cooling.

[0054] Specifically, the aging treatment process in step five is: select a box-type furnace for aging treatment, control the aging temperature at 200°C-300°C, control the insulation time at 3-5h, and select a natural temperature cooling method for cooling.

[0055] Specifically, the sandblasting conditions in step nine are: select corundum as the sandblasting material, control the compressed air pressure at 0.20-0.25 MPa, and control the distance between the sandblasting gun and the surface of the copper tube to be 15-20 cm.

[0056] Example 1

[0057] Step 1: Raw material preparation: Select copper ingots with a copper content of 99.97% as raw materials;

[0058] Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid;

[0059] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0060] Step 4, rolling: placing the copper tube blank at the entrance of the two-roller Piger mill, using the two-roller Piger mill for preliminary rolling, thinning the copper tube wall thickness by reducing the roll gap by 0.23mm±0.0010mm each time, while maintaining the circular cross-section of the copper tube, and rolling the copper tube alternately between the two-roller Piger mill and the four-roller mill for 8 passes;

[0061] Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube;

[0062] Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed;

[0063] Step 7: Cleaning: Clean the cut copper tube;

[0064] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree;

[0065] Step 9: Surface treatment: Polishing and sandblasting the bent copper tube;

[0066] Step 10: Quality control: Implement full-process intelligent online quality monitoring during the production process, including quality testing by online detectors and regular sampling tests;

[0067] Step 11, post-processing: drying in an oven;

[0068] Step 12: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

[0069] Example 2

[0070] Step 1: Raw material preparation: Select copper ingots with a copper content of 99.98% as raw materials;

[0071] Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid;

[0072] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0073] Step 4, rolling: placing the copper tube blank at the entrance of the two-roller Piger mill, using the two-roller Piger mill for preliminary rolling, thinning the copper tube wall thickness by reducing the roll gap by 0.23mm±0.0015mm each time, while maintaining the circular cross-section of the copper tube, and rolling the copper tube alternately between the two-roller Piger mill and the four-roller mill for 6 passes;

[0074] Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube;

[0075] Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed;

[0076] Step 7: Cleaning: Clean the cut copper tube;

[0077] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree;

[0078] Step 9: Surface treatment: Polishing and sandblasting the bent copper tube;

[0079] Step 10: Quality control: Implement full-process intelligent online quality monitoring during the production process, including quality testing by online detectors and regular sampling tests;

[0080] Step 11, post-processing: drying in an oven;

[0081] Step 12: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

[0082] Comparative Example 1

[0083] Step 1: Raw material preparation: Select copper ingots with a copper content of 99.85% as raw materials;

[0084] Step 2, smelting: placing the copper ingot into a common electric furnace, evacuating the vacuum, and then heating and melting it, controlling the smelting and solidification process to obtain smelted copper liquid;

[0085] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0086] Step 4, rolling: placing the copper tube blank at the entrance of the two-roller Piger mill, using the two-roller Piger mill for preliminary rolling, thinning the copper tube wall thickness by reducing the roll gap by 0.23mm±0.0010mm each time, while maintaining the circular cross-section of the copper tube, and rolling the copper tube alternately between the two-roller Piger mill and the four-roller mill for 8 passes;

[0087] Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube;

[0088] Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed;

[0089] Step 7: Cleaning: Clean the cut copper tube;

[0090] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree;

[0091] Step 9: Surface treatment: Polishing and sandblasting the bent copper tube;

[0092] Step 10: Quality control: Implement full-process intelligent online quality monitoring during the production process, including quality testing by online detectors and regular sampling tests;

[0093] Step 11, post-processing: drying in an oven;

[0094] Step 12: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

[0095] Comparative Example 2

[0096] Step 1: Raw material preparation: Select copper ingots with a copper content of 99.98% as raw materials;

[0097] Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid;

[0098] Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness;

[0099] Step 4: Rolling: Rolling is performed using traditional technical methods;

[0100] Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube;

[0101] Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed;

[0102] Step 7: Cleaning: Clean the cut copper tube;

[0103] Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree;

[0104] Step 9: Surface treatment: Polishing the bent copper tube;

[0105] Step 10: Quality control: Conduct quality inspection and regular sampling inspection during the production process;

[0106] Step 11: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

[0107] The steel pipes made by the processing technology of Examples 1 and 2 and Comparative Examples 1 and 2 were subjected to finished product quality inspection, including final copper content, oxygen content, size inspection, mechanical property test and appearance inspection of the finished copper pipes. The inspection data are as follows:

[0108] project Example 1 Comparative Example 1 Example 2 Comparative Example 2 Copper content (%) 99.97 99.71 99.98 99.90 Oxygen content (ppm) Not detected 10 Not detected 8 Dimensional accuracy 0.0015mm 0.02mm 0.0015mm 0.009mm Mechanical properties excellent generally excellent good Appearance inspection No defects Minor scratches No defects Minor scratches Corrosiveness(%) 0.00％ 0.05％ 0.00％ 0.03％ Electrical conductivity (%) 100％ 98％ 100％ 95％

[0109] Note: Acidic solutions with different pH values ​​of 5-6 were used to simulate the acid rain environment and the corrosion was tested for 25 hours; the conductivity of the finished copper tube was tested using an eddy current conductivity meter.

[0110] The above examples and comparative examples are combined with the table test data for analysis as follows:

[0111] Copper content (%): The copper contents of Example 1 and Example 2 are 99.97% and 99.98%, respectively, which are higher than 99.71% of Comparative Example 1 and 99.90% of Comparative Example 2, indicating that the high-purity copper ingot used in Example 1 is matched with the smelting process, which helps to maintain the high copper content of the finished copper tube.

[0112] Oxygen content (ppm): The oxygen content of Example 1 and Example 2 was not detected, while the oxygen content of Comparative Example 1 and Comparative Example 2 was 10 ppm and 8 ppm, respectively, indicating that the vacuum melting process can effectively reduce the oxygen content in the copper tube, thereby improving corrosion resistance and conductivity.

[0113] Dimensional accuracy: The dimensional accuracy of Example 1 and Example 2 are 0.0015 mm and 0.0015 mm, respectively, which are better than 0.02 mm of Comparative Example 1 and 0.009 mm of Comparative Example 2, indicating that the control of the roller gap and the intelligent online quality monitoring in the embodiments are helpful to improve the dimensional accuracy of the product.

[0114] Mechanical properties: The mechanical properties of Examples 1 and 2 were evaluated as “excellent”, while Comparative Example 1 was “average” and Comparative Example 2 was “good”, indicating that the high-purity copper ingots used in the examples and the annealing, solution treatment and aging treatment of the copper tube during the rolling process contributed to the improvement of the mechanical properties of the steel tube.

[0115] Appearance inspection: The appearance inspection results of Example 1 and Example 2 are "defect-free", while Comparative Example 1 and Comparative Example 2 have "slight scratches", indicating that the polishing and sandblasting surface treatment processes used in the examples can improve the surface quality of the steel pipe.

[0116] In summary, Example 1 and Example 2 are superior to Comparative Example 1 and Comparative Example 2 in terms of copper content, oxygen content, dimensional accuracy, mechanical properties and appearance inspection, indicating that the high-purity copper ingot, vacuum melting process, fine roll gap control, intelligent online quality monitoring, and polishing and sandblasting surface treatment processes adopted by the present invention can improve the overall quality of the finished copper tube, thereby solving the problems of low copper content, high oxygen content and insufficient accuracy of copper tubes produced by traditional processing methods.

[0117] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The processing technology of oxygen-free copper tube for magnetron anode cylinder is characterized in that: The following steps are involved: Step 1: Raw material preparation: Select copper ingots with a copper content of 99.97%-100% as raw materials; Step 2, smelting: placing the copper ingot in a vacuum electric furnace for heating and melting, controlling the smelting and solidification process, and obtaining smelted copper liquid; Step 3: Extrusion molding: pour the smelted copper liquid into the copper tube mold through the pouring port, use a press and set the press parameters to hydraulically extrude the copper into a copper tube blank, and initially form the outer wall of the copper tube blank of the required thickness; Step 4, rolling: Place the copper tube blank at the entrance of the two-roller Piger mill, use the two-roller Piger mill for preliminary rolling, reduce the wall thickness of the copper tube by reducing the roll gap by 0.23mm±0.0015mm each time, while maintaining the circular cross-section of the copper tube, and roll the copper tube alternately between the two-roller Piger mill and the four-roller mill for 5-8 passes; Step 5: Heat treatment: annealing, solution treatment and aging treatment of the rolled copper tube; Step 6: Cutting: Use chipless sawing technology to cut the copper tube as needed; Step 7: Cleaning: Clean the cut copper tube; Step 8. Bending: Use a pipe bender to bend the copper pipe according to the required bending degree; Step 9: Surface treatment: Polishing and sandblasting the bent copper tube; Step 10: Quality control: Implement full-process intelligent online quality monitoring during the production process, including quality testing by online detectors and regular sampling tests; Step 11, post-processing: drying in an oven; Step 12: Finished product inspection: Conduct dimensional inspection, mechanical property test and appearance inspection on the finished copper tube.

2. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: In the step 2, the vacuum furnace smelting conditions are set as follows: the vacuum degree is controlled at 70-95 Pa, the smelting temperature is controlled at 1175° C.-1190° C., the insulation time is controlled at 0.95-1.2 h, and the electromagnetic field current intensity is controlled at 60A-70A.

3. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: In the step 2, the vacuum furnace solidification conditions are set as follows: the pulling speed is controlled at 110-115 mm / min, the temperature of the cooling water is controlled at 30° C.-35° C., and the vacuum degree is maintained at 70-95 Pa.

4. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: The parameters of the press in step 3 are as follows: the extrusion pressure is controlled at 250-300 MPa, the extrusion temperature is controlled at 900° C.-1000° C., and the extrusion speed is controlled at 8-10 m / min.

5. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: In the step 4, the setting process of thinning the wall thickness of the copper tube by reducing the roll gap by 0.23mm±0.0015mm each time is as follows: the wall thickness of the copper tube blank is 2mm, the target wall thickness of the copper tube is 0.15mm, the total reduction is 1.85mm, and the target size is reached through 8 rolling passes, so the average reduction per rolling is 0.23mm.

6. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: The conditions for the 5-8 passes of rolling in step 4 are: the pressure is controlled at 300-310 MPa, the processing rate is controlled at 76%-77%, the temperature is controlled at 25-30°C, and the rolling speed is controlled at 50mm / min-55mm / min.

7. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: The annealing process in step 5 is: using a box furnace for annealing, setting the annealing temperature between 450° C. and 650° C., setting the holding time to 2.5-3.5 hours, and selecting air cooling for cooling.

8. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1 is characterized in that: The solution treatment process in step 5 is as follows: a continuous solution treatment furnace is selected for solution treatment, the solution temperature is controlled at 800°C-900°C, the holding time is controlled at 30min-45min, and water cooling is selected for cooling.

9. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1, characterized in that: The aging treatment process in step 5 is: select a box-type furnace for aging treatment, control the aging temperature at 200° C.-300° C., control the insulation time at 3-5 hours, and select a natural temperature cooling method for cooling.

10. The processing technology of oxygen-free copper tube for magnetron anode cylinder according to claim 1, characterized in that: The sandblasting conditions in step nine are as follows: diamond abrasive is selected as the sandblasting material, the compressed air pressure is controlled at 0.20-0.25 MPa, and the distance between the sandblasting gun and the surface of the copper tube is controlled at 15-20 cm.

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