Machining method of pure titanium large-diameter thin-wall part

Abstract

The invention discloses a machining method of a pure titanium large-diameter thin-wall part, and belongs to the technical field of pure titanium machining. (2) roughly turning inner and outer circles of the blank; (3) turning around and roughly turning inner and outer circles; (4) naturally aging for 24H; (5) turning a process table; (6) a tool is installed, and the surface runout of the tool is leveled to be smaller than or equal (7) compressing the process table, and performing semi-finish turning and finish turning on the inner and outer shapes of the large-diameter thin-wall part; (8) milling a process groove; (9) turning around and finish-turning inner and outer molded surfaces; by means of the process steps and matching with tool clamps and process parameters in all the processes, stable machining of the pure titanium large-diameter thin-wall parts in batches can be achieved, the form and location tolerances such as roundness, cylindricity, coaxiality and perpendicularity of the ultra-large-specification pure titanium barrel-shaped part with the diameter being 3600 mm, the height being 900 mm and the wall thickness being 40-50 mm can stably reach 0.05-0.1, the requirement for the diameter tolerance range being 0.2 or above can also be met, and the requirement for the large-specification pure titanium barrel-shaped part with the diameter being 3600 mm, the height being 900 mm and the wall thickness being 40-50 mm can be met. And the wall thickness difference stably reaches within 0.05-0.1, the quality requirement can be stably controlled, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of pure titanium processing, in particular to a processing method for a pure titanium large-diameter thin-walled part. Background Art

[0002] The cathode roller blanks used in copper foil production are mostly made of pure titanium (TA1) material. TA1 material has low strength and good plasticity. With the development of the industry, the processing requirements for cathode roller blanks are getting higher and higher. Not only has the size developed from the original 1 meter to 2 meters to the current 3 meters to 4 meters, and there is even a demand for super-large specifications, but also higher requirements have been put forward in terms of dimensional accuracy, form and position tolerance and surface quality. There are many difficulties and unstable factors in meeting the dimensional accuracy, form and position tolerance accuracy and surface quality requirements of large-diameter thin-walled parts processing.

[0003] Pure titanium is prone to deformation during machining. Analysis of the causes of deformation is multifaceted, including the influence of forging raw materials, the influence of machining cutting heat, the influence of improper clamping, the influence of cutting tools, etc. It is necessary to comprehensively consider and eliminate these multiple influencing factors to stably control its machining deformation. In the patent of this invention, this mature process flow combines the above considerations and effectively controls multiple key factors and key points. In order to solve the above problems, the applicant proposed the patent of this invention after a lot of practical research, effectively controlling the deformation in the machining of pure titanium large-diameter thin-walled parts, and finally formed a set of effective process methods for machining pure titanium large-diameter thin-walled parts. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned background technical difficulties and provide a method for processing pure titanium large-diameter thin-walled parts.

[0005] To achieve the above purpose, the technical solution adopted is: a processing method for pure titanium large-diameter thin-walled parts, comprising the following steps: ① Rough turning reference of blank: select the unprocessed blank surface as the positioning reference; ② Rough turning of the inner and outer circles of the blank, controlling the deformation to ≤1mm; ③ Turn around and rough turn the inner and outer circles, and rough turn the base; ④ Natural aging for 24 hours to release stress; ⑤ Turning table, precision turning reference, control reference surface runout ≤ 0.1 mm; ⑥ Install the tooling and smooth the tooling surface runout ≤ 0.05 mm; ⑦ Pressing process table, semi-finishing turning, finishing turning the inner and outer shapes of large diameter thin-walled parts; ⑧ Milling process groove; ⑨Turn around and fine-turn the inner and outer surfaces; The precision turning includes multiple toolings, each of which is a cylinder with adjustable height. Multiple toolings are arranged in a circle and fixed vertically on a turntable. After the multiple toolings are positioned at a certain height, their surface references need to be turned flat. The turntable is provided with a support vertically arranged at the same level as the tooling on the outside of the tooling. The height difference between the support and the tooling is determined according to the process parameters. Large-diameter thin-walled parts are installed on the top of the multiple toolings, and movable turning tools are provided on the inner and outer walls of the large-diameter thin-walled parts. A pressure plate is provided on the top of the support and the tooling to evenly press the outer wall of the large-diameter thin-walled part using a torque wrench according to the process parameters. The turntable rotates forward according to the speed provided by the process parameters, and performs turning according to the process parameters and steps.

[0006] Furthermore, the large diameter thin-walled part also includes preliminary processing of the outer wall of the large diameter thin-walled part in step ⑦. Before using the turning assembly, a circular groove is turned on the outer wall of the large diameter thin-walled part 3-10 cm close to the pipe mouth of the large diameter thin-walled part, and the end of the pressure plate away from the support is placed in the groove.

[0007] Furthermore, the turntable is circular, and a plurality of the tooling is arranged on the surface of the turntable and distributed in a circle with the center of the turntable as the center. The tooling includes at least 8 pieces, and the tooling is an inner column and an outer column arranged in groups of two. The outer wall of the inner column on the side away from the center of the turntable and the outer wall of the outer column close to the center of the turntable are arc-shaped and arranged concentrically with the turntable. A control console is provided at the bottom of the inner column or the outer column, and a lifting mechanism for controlling the inner column and the outer column to lift and lower respectively is provided in the control console, and a pushing mechanism for pushing the outer column and the inner column away from the center of the turntable and close to the center of the turntable.

[0008] Furthermore, the console includes a sliding block arranged at the bottom of the inner column and the outer column, the turntable is provided with a groove for placing the sliding block corresponding to the position of the sliding block, the sliding block is arranged in the groove, the surface of the groove is provided with a slide rail, the bottom of the sliding block is slidably connected to the slide rail, the lifting mechanism is arranged in the sliding block, the lifting mechanism includes an electric lifting column, and the top of the electric lifting column is fixedly connected to the bottom of the outer column.

[0009] Furthermore, one end of the slide rail is arranged toward the center of the turntable, and the sliding distance of the sliding block on the slide rail is set to be greater than the turning thickness of the inner wall of the large-diameter thin-walled part by 0.5-2 cm. The pushing mechanism includes an electric push rod, which is arranged at one end of the slide rail close to the center of the turntable. The pushing end of the electric push rod is fixedly connected to the outer wall of the sliding block close to the center of the turntable, and the sliding block is fixedly connected to the inner wall of the table on the outer wall on the other side away from the electric push rod.

[0010] Furthermore, the pushing mechanism includes a screw assembly, which includes two screws arranged above the slide rail and parallel to the slide rail, a connecting rod with a moving block passing through the sliding block is provided between the two screws, both ends of the connecting rod are slidably connected with sliding nuts on the two screws, one end of the two screws is connected to a transmission threaded rod, the two ends of the transmission threaded rod and the outer walls of the two screws are transmitted through a mechanical transmission method of a turbine worm gear, the middle part of the transmission threaded rod is connected to an output end of a motor, and the motor output end and the transmission threaded rod are also mechanically connected by a turbine worm gear to drive the transmission threaded rod to rotate, and the inner and outer walls of the sliding block penetrated by the connecting rod are provided with a connecting block fixedly connected to the connecting rod.

[0011] Furthermore, a workbench arranged parallel to the turntable is provided on the top of the large-diameter thin-walled part, the workbench and the turntable are arranged to rotate coaxially, and the workbench is provided with a clamping claw for clamping the top of the large-diameter thin-walled part.

[0012] Further, the method comprises the following steps: ① rough turning reference of the blank: selecting the unprocessed blank surface as the positioning reference; ② Rough turning of the inner and outer circles of the blank, controlling the deformation to ≤1mm; ③ Rough turning the inner circle, rough turning the outer circle, adjust the lifting mechanism and the pushing mechanism, continue to rough turn the bottom of the inner circle and the bottom of the outer circle, and rough turn the benchmark; ④ Natural aging for 24 hours to release stress; ⑤ Turning table, precision turning reference, control reference surface runout ≤ 0.1 mm; ⑥ Install the tooling and smooth the tooling surface runout ≤ 0.05 mm; ⑦ Pressing process table, semi-finishing turning, finishing turning the inner and outer shapes of large diameter thin-walled parts; ⑧ Milling process groove; ⑨Adjust the lifting mechanism and pushing mechanism to fine-tune the inner and outer surfaces.

[0013] The beneficial effects of adopting the above scheme are as follows: after the processing method of pure titanium large-diameter thin-walled parts is applied, through this process step and the coordination of the tooling fixtures and process parameters in each process, the stable processing of large-diameter thin-walled parts of pure titanium in batches can be achieved. The shape and position tolerances of the roundness, cylindricity, coaxiality, verticality, etc. of the ultra-large pure titanium cylindrical parts with a diameter of 3600mm, a height of 900mm, and a wall thickness of 40~50mm can stably reach 0.05~0.1, and can also meet the requirements of its diameter tolerance band of more than 0.2. The wall thickness difference can stably reach within 0.05~0.1, the quality requirements can be stably controlled, and the production efficiency can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the finishing structure in the processing method of pure titanium large-diameter thin-walled parts of the present invention.

[0015] Figure 2 It is a top view of the finishing structure in the processing method of pure titanium large-diameter thin-walled parts in Example 2.

[0016] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of part A.

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of part A in Example 3.

[0018] Figure 5 for Figure 4 Top view after removing the tooling.

[0019] Figure 6 It is a schematic diagram of the finishing structure in the processing method of pure titanium large-diameter thin-walled parts in Example 3.

[0020] In the figure, 1. turntable; 2. tooling; 3. support; 4. pressure plate; 5. large diameter thin-walled parts; 6. inner column; 7. outer column; 8. groove; 9. slide rail; 10. electric push rod; 11. sliding block; 12. electric lifting column; 13. torsion spring; 14. lead screw; 15. connecting block; 16. sliding nut; 17. transmission threaded rod; 18. motor output end; 19. motor; 20. clamp; 21. workbench. DETAILED DESCRIPTION

[0021] The technical scheme of the present invention is clearly and completely described below in conjunction with the specific embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1 like Figure 1 , including the following steps: ① Rough turning reference of blank: select the unprocessed blank surface as the positioning reference; ② Rough turning of the inner and outer circles of the blank, controlling the deformation to ≤1mm; ③ Turn around and rough turn the inner and outer circles, and rough turn the base; ④ Natural aging for 24 hours to release stress; ⑤ Turning table, precision turning reference, control reference surface runout ≤ 0.1 mm; ⑥Install tooling 2 and level the tooling 2 surface runout ≤ 0.05 mm; ⑦ Press the process table, semi-finish turning, and finish turning the inner and outer shapes of large-diameter thin-walled parts 5; ⑧ Milling process groove; ⑨Turn around and fine-turn the inner and outer surfaces; The precision turning comprises a plurality of toolings 2, wherein the toolings 2 comprise at least 8 of them, each of the toolings 2 being a cylinder with adjustable height, and the plurality of toolings 2 being arranged in a circle and being vertically fixed on a turntable 1, and after the plurality of toolings 2 are positioned at a certain height, their surface references need to be turned flat, and the turntable 1 is provided with a support 3 which is arranged horizontally and vertically with the toolings 2 on the outer side of the toolings 2, and the height difference between the support 3 and the toolings 2 is determined according to the process parameters, and a large-diameter thin-walled part 5 is provided on the top of the plurality of toolings 2, and a movable turning tool is provided on the inner and outer walls of the large-diameter thin-walled part 5, and a pressure plate 4 which is used to evenly press the outer wall of the large-diameter thin-walled part 5 using a torque wrench according to the process parameters is provided on the top of the support 3 and the tooling 2, and the turntable 1 rotates forward according to the speed provided by the process parameters, and performs turning processing according to the process processing parameters and steps.

[0023] The large-diameter thin-walled part 5 also includes preliminary processing of the outer wall of the large-diameter thin-walled part 5 in step ⑦. Before using the turning component, a circular groove is turned on the outer wall of the large-diameter thin-walled part 5 3-10 cm close to the pipe mouth of the large-diameter thin-walled part 5, and the end of the pressure plate 4 away from the support 3 is placed in the groove.

[0024] The specific implementation method is as follows: place the large-diameter thin-walled part 5 after initial processing and internal and external rough turning on the fine turning machine, place the bottom of the large-diameter thin-walled part 5 on the tooling 2, and then use a torque wrench to place the end of the pressing plate 4 away from the support 3 into the groove of the outer wall of the large-diameter thin-walled part 5 to lock the large-diameter thin-walled part 5 on the fine turning surface, turn on the turning tool to perform fine turning on the inside and outside of the large-diameter thin-walled part 5. After fine turning, the part pressed by the pressing plate 4 cannot be fine turned, so the large-diameter thin-walled part 5 is turned around, and the top of the large-diameter thin-walled part 5 after the turn is used to perform internal and external fine turning.

[0025] After the application of this processing method for pure titanium large-diameter thin-walled parts, through this process step and the coordination of the tooling 2 fixtures and process parameters in each process, the stable processing of large-diameter thin-walled parts of pure titanium in batches can be achieved. The roundness, cylindricity, coaxiality, verticality and other geometric tolerances of ultra-large-sized pure titanium cylindrical parts with a diameter of 3600mm, a height of 900mm and a wall thickness of 40~50mm can stably reach 0.05~0.1, and can also meet the requirements of its diameter tolerance band of more than 0.2. The wall thickness difference is stably within 0.05~0.1, the quality requirements can be stably controlled, and the production efficiency can be significantly improved. The mature, stable and reliable process flow can realize the stable batch production of large-diameter thin-walled parts of pure titanium; with the cooperation of excellent tooling 2 fixtures and cutting tools, the processing parameters are improved, and the production efficiency is significantly improved. (From an average of 3 days (6 shifts) to complete 1 piece to an average of 1 day (2 shifts) to produce 1 piece Embodiment 2 On the basis of the first embodiment, the applicant considered that the large diameter thin-walled part 5 is prone to deformation of the outer wall of the large diameter thin-walled part 5 due to improper operation during the turning process, and the turning step also wastes a certain amount of time. After many experiments, the applicant invented Figure 2 Fine turning in.

[0026] like Figure 2 As shown, the turntable 1 is circular, and a plurality of the tooling 2 are arranged on the surface of the turntable 1 and are distributed in a circle with the center of the turntable 1 as the center. The tooling 2 is an inner column 6 and an outer column 7 in groups of two. The outer wall of the inner column 6 on the side away from the center of the turntable 1 and the outer wall of the outer column 7 close to the center of the turntable 1 are arc-shaped and arranged concentrically with the turntable 1. A control console is provided at the bottom of the inner column 6 or the outer column 7. A lifting mechanism for controlling the inner column 6 and the outer column 7 to lift and lower respectively is provided in the control console, and a pushing mechanism for pushing the outer column 7 and the inner column 6 away from the center of the turntable 1 and close to the center of the turntable 1 is also provided.

[0027] like Figure 3 As shown, the console includes a sliding block 11 arranged at the bottom of the inner column 6 and the outer column 7, the turntable 1 is provided with a groove 8 for placing the sliding block 11 at the position of the sliding block 11, the sliding block 11 is arranged in the groove 8, the surface of the groove 8 is provided with a slide rail 9, the bottom of the sliding block 11 is slidably connected to the slide rail 9, the lifting mechanism is arranged in the sliding block 11, the lifting mechanism includes an electric lifting column 12, the top of the electric lifting column 12 is fixedly connected to the bottom of the outer column 7.

[0028] like Figure 3 As shown, one end of the slide rail 9 is arranged toward the center of the turntable 1, and the sliding distance of the sliding block 11 on the slide rail 9 is set to be greater than the turning thickness of the inner wall of the large-diameter thin-walled part 5 by 0.5-2 cm. The pushing mechanism includes an electric push rod 10, and the electric push rod 10 is arranged at one end of the slide rail 9 close to the center of the turntable 1. The pushing end of the electric push rod 10 is fixedly connected to the outer wall of the sliding block 11 close to the center of the turntable 1, and the sliding block 11 is fixedly connected to the inner wall of the truncated table on the outer wall on the other side away from the electric push rod 10. A torsion spring 13 is provided.

[0029] When implementing it, Figure 6 A workbench 21 parallel to the turntable 1 is provided on the top of the large-diameter thin-walled part 5 . The workbench 21 is coaxially rotatable with the turntable 1 . The workbench 21 is provided with a clamping claw 20 for clamping the top of the large-diameter thin-walled part 5 .

[0030] The specific implementation method is as follows: on the basis of the first embodiment, the large-diameter thin-walled part 5 with a rough inner shape is placed on the inner column 6 and the outer column 7 of the tooling 2, the pressing plate 4 is pressed against the outer wall of the large-diameter thin-walled part 5, and the turning tool is turned on to perform fine turning on the inner and outer walls of the large-diameter thin-walled part 5. After fine turning, due to the bottom of the large-diameter thin-walled part 5 and the surface foundation of the inner column 6 and the outer column 7, the surface of the inner wall of the large-diameter thin-walled part 5 cannot be fine-turned into place. At this time, the pressing plate 4 is loosened, and the lifting mechanism in the control console is turned on. The electric lifting column 12 will rise at the same time, raising the height of the outer column 7 to be higher than the inner column 6. At this time, the large-diameter thin-walled part 5 is also lifted. At the same time, the electric push rod 10 in the push rod mechanism is turned on to move its sliding block 11 to the slide rail 9 away from the center end of the turntable 1. At this time, the surface of the outer column 7 is away from the center of the circle. The turning of the inner wall of the large-diameter thin-walled part 5 will no longer be affected. At this time, the pressing plate 4 is adjusted again to press the large-diameter thin-walled part 5 to turn the bottom end of the inner wall of the large-diameter thin-walled part 5.

[0031] After the bottom end of the inner wall of the large-diameter thin-walled part 5 is turned, the pressure plate 4 is removed, and the outer column 7 is lifted and lowered to be lower than the inner column 6 after the electric lifting column 12 is started. At this time, the electric push rod 10 is pushed away from the center end of the turntable 1, and the outer wall of the inner column 6 close to the end of the outer column 7 is pressed against the inner wall of the large-diameter thin-walled part 5. At this time, due to the pressure of the torsion spring 13, the multiple inner columns 6 on the turntable 1 can simultaneously clamp the inner wall of the large-diameter thin-walled part 5 outward. At this time, the top of the large-diameter thin-walled part 5 is provided with a clamping jaw 20 of a workbench 21 which is arranged parallel to the turntable 1 and rotates coaxially. The clamping jaw 20 clamps the top of the large-diameter thin-walled part 5, and the workbench 21 is arranged coaxially with the turntable 1. The workbench 21 is provided with a clamping jaw 20 for clamping the top of the large-diameter thin-walled part 5, so as to achieve the overall effect of clamping the inside and outside of the large-diameter thin-walled part 5. At this time, the turntable 1 is started, and the bottom end of the outer wall of the large-diameter thin-walled part 5 can be fine-turned.

[0032] After the overall application, based on the first embodiment, the step of turning around is no longer required, which saves a lot of operation time and avoids the damage to the large-diameter thin-walled part 5 caused by improper operation during the turning process. Based on the production of the first embodiment, an average output of 1 piece per day (1 shift) can be achieved, doubling the efficiency.

[0033] Embodiment 3 On the basis of the second embodiment, the applicant considered that if the torsion spring 13 is used for a long time and its elastic force is damaged, the stability of the entire finishing process will be affected. Therefore, the applicant conducted many experiments and made improvements.

[0034] like Figure 4-6The pushing mechanism includes a screw rod 14 assembly, which includes two screw rods 14 arranged above the slide rail 9 and parallel to the slide rail 9. A connecting rod through which a moving block passes through the sliding block 11 is provided between the two screw rods 14. Both ends of the connecting rod are slidably connected with sliding nuts 16 on the two screw rods 14. One end of the two screw rods 14 is connected with a transmission threaded rod 17. Both ends of the transmission threaded rod 17 and the outer walls of the two screw rods 14 are transmitted through a mechanical transmission method of a worm gear. The middle part of the transmission threaded rod 17 is connected to a motor output end 18. The motor output end 18 and the transmission threaded rod 17 are also mechanically connected by a worm gear to drive the transmission threaded rod 17 to rotate. The inner and outer walls of the sliding block 11 penetrated by the connecting rod are provided with a connecting block 15 fixedly connected to the connecting rod.

[0035] A workbench 21 parallel to the turntable 1 is disposed on the top of the large-diameter thin-walled component 5 . The workbench 21 is coaxially rotatable with the turntable 1 . The workbench 21 is provided with a clamping claw 20 for clamping the top of the large-diameter thin-walled component 5 .

[0036] During specific implementation, the motor 19 is a forward and reverse control motor 19 .

[0037] The specific implementation method is as follows. On the basis of the second embodiment, a large-diameter thin-walled part 5 with a rough inner shape is placed on the inner column 6 and the outer column 7 of the tooling 2, the pressing plate 4 is pressed against the outer wall of the large-diameter thin-walled part 5, and the turning tool is turned on to perform fine turning on the inner and outer walls of the large-diameter thin-walled part 5. After fine turning, due to the bottom of the large-diameter thin-walled part 5 and the surface foundation of the inner column 6 and the outer column 7, the surface of the inner wall of the large-diameter thin-walled part 5 cannot be fine-turned into place. At this time, the pressing plate 4 is loosened, and the lifting mechanism in the control console is turned on. The electric lifting column 12 of the lifting mechanism will rise at the same time, raising the height of the outer column 7. To a position higher than the inner column 6. At this time, the large diameter thin-walled part 5 is also lifted up. At the same time, the motor 19 is turned on. The motor output end 18 drives the transmission threaded rod 17 to rotate, and at the same time drives the screw rods 14 at both ends of the transmission threaded rod 17 to transmit. The sliding nut 16 on the screw rod 14 drives the sliding block 11 to move on the slide rail 9 away from the center end of the turntable 1. At this time, the surface of the outer column 7 is away from the center of the circle. The turning of the inner wall of the large diameter thin-walled part 5 will no longer be affected. At this time, the pressure plate 4 is adjusted again to press the large diameter thin-walled part 5 to turn the bottom end of the inner wall of the large diameter thin-walled part 5.

[0038] After the bottom end of the inner wall of the large-diameter thin-walled part 5 is turned, the pressure plate 4 is removed, and the outer column 7 is lifted and lowered to be lower than the inner column 6 after the electric lifting column 12 is started. At this time, the motor 19 is reversed to push the sliding block 11 away from the center end of the turntable 1, so that the outer wall of the inner column 6 close to the end of the outer column 7 is close to the inner wall of the large-diameter thin-walled part 5. At this time, due to the pressure of the torsion spring 13, the multiple inner columns 6 on the turntable 1 can simultaneously clamp the inner wall of the large-diameter thin-walled part 5 outward. At this time, the top of the large-diameter thin-walled part 5 is provided with a clamping jaw 20 of a workbench 21 which is arranged parallel to the turntable 1 and rotates coaxially. The clamping jaw 20 clamps the top of the large-diameter thin-walled part 5, and the workbench 21 is arranged coaxially with the turntable 1. The workbench 21 is provided with a clamping jaw 20 for clamping the top of the large-diameter thin-walled part 5, so as to achieve the overall effect of clamping the inside and outside of the large-diameter thin-walled part 5. At this time, the turntable 1 is started, and the bottom end of the outer wall of the large-diameter thin-walled part 5 can be fine-turned.

[0039] Since the screw rod 14 structure itself has good self-locking properties, the sliding block 11 can ensure the connection relationship between the large diameter thin-walled part 5 and the inner column 6 and the outer column 7 after the motor 19 stops. Compared with the second embodiment, it has better stability and longer service life. For the long-term manufacturing of large diameter thin-walled parts 5, while ensuring precision, stability and safety need to be considered.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for processing pure titanium large-diameter thin-walled parts, characterized in that: The following steps are involved: ① Rough turning reference of blank: select the unprocessed blank surface as the positioning reference; ② Rough turning of the inner and outer circles of the blank, controlling the deformation to ≤1mm; ③ Turn around and rough turn the inner and outer circles, and rough turn the base; ④ Natural aging for 24 hours to release stress; ⑤ Turning table, precision turning reference, control reference surface runout ≤ 0.1 mm; ⑥ Install the tooling (2) and level the tooling (2) to a surface runout of ≤0.05 mm; ⑦ Pressing process table, semi-finishing turning, finishing turning the inner and outer shapes of large diameter thin-walled parts (5); ⑧ Milling process groove; ⑨Turn around and fine-turn the inner and outer surfaces; The precision turning process comprises a plurality of toolings (2), each of which is a cylinder with adjustable height. The plurality of toolings (2) are arranged in a circle and are vertically fixed on a turntable (1). After the plurality of toolings (2) are positioned at a certain height, their surface references need to be turned flat. The turntable (1) is provided with a support (3) arranged horizontally and vertically with the tooling (2) on the outer side of the toolings (2). The height difference between the support (3) and the toolings (2) is determined according to process parameters. Large-diameter thin-walled parts (5) are installed above the plurality of toolings (2). The inner and outer walls of the large-diameter thin-walled parts (5) are provided with movable turning tools. A pressing plate (4) is provided on the top of the support (3) and the toolings (2) for evenly pressing the outer wall of the large-diameter thin-walled part (5) using a torque wrench according to the process parameters. The turntable (1) rotates forward according to the speed provided by the process parameters, and performs turning according to the process parameters and steps.

2. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: The large-diameter thin-walled part (5) further comprises preliminary processing of the outer wall of the large-diameter thin-walled part (5) in step ⑦. Before using the turning assembly, a circular groove is machined on the outer wall of the large-diameter thin-walled part (5) 3-10 cm away from the pipe opening of the large-diameter thin-walled part (5), and the end of the pressing plate (4) away from the support (3) is placed in the groove.

3. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: The turntable (1) is circular, and a plurality of the tooling (2) are arranged on the surface of the turntable (1) and are distributed in a circle with the center of the turntable (1) as the center. The tooling (2) includes at least 8 pieces, and each of the tooling (2) is an inner column (6) and an outer column (7) arranged in pairs. The outer wall of the inner column (6) on the side away from the center of the turntable (1) and the outer wall of the outer column (7) close to the center of the turntable (1) are arc-shaped and arranged concentrically with the turntable (1). A control console is arranged at the bottom of the inner column (6) or the outer column (7), and a lifting mechanism for controlling the inner column (6) and the outer column (7) to be lifted and lowered respectively is arranged in the control console, and a pushing mechanism for pushing the outer column (7) and the inner column (6) away from the center of the turntable (1) and close to the center of the turntable (1) is also arranged.

4. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: The control console comprises a sliding block (11) arranged at the bottom of the inner column (6) and the outer column (7); the turntable (1) is provided with a groove (8) corresponding to the position of the sliding block (11) for placing the sliding block (11); the sliding block (11) is arranged in the groove (8); a slide rail (9) is arranged on the surface of the groove (8); the bottom of the sliding block (11) is slidably connected to the slide rail (9); the lifting mechanism is arranged in the sliding block (11); the lifting mechanism comprises an electric lifting column (12); the top of the electric lifting column (12) is fixedly connected to the bottom of the outer column (7).

5. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: One end of the slide rail (9) is arranged toward the center of the turntable (1); the sliding distance of the sliding block (11) on the slide rail (9) is arranged to be greater than the turning thickness of the inner wall of the large-diameter thin-walled part (5) by 0.5-2 cm; the pushing mechanism comprises an electric push rod (10); the electric push rod (10) is arranged at one end of the slide rail (9) close to the center of the turntable (1); the pushing end of the electric push rod (10) is fixedly connected to the outer wall of the sliding block (11) close to the center of the turntable (1); and the outer wall of the sliding block (11) on the other side away from the electric push rod (10) is fixedly connected to the inner wall of the truncated table with a torsion spring (13).

6. The method for processing pure titanium large-diameter thin-walled parts according to claim 3 is characterized by: The pushing mechanism comprises a screw rod (14) assembly, wherein the screw rod (14) assembly comprises two screw rods (14) arranged above the slide rail (9) and parallel to the slide rail (9), a connecting rod of a movable block penetrating the sliding block (11) is provided between the two screw rods (14), both ends of the connecting rod are slidably connected with sliding nuts (16) on the two screw rods (14), one end of the two screw rods (14) is connected with a transmission threaded rod (17), the two ends of the transmission threaded rod (17) and the outer walls of the two screw rods (14) are driven by a mechanical transmission method of a worm gear, the middle part of the transmission threaded rod (17) is connected to a motor output end (18), and the motor output end (18) and the transmission threaded rod (17) are also mechanically connected by a worm gear to drive the transmission threaded rod (17) to rotate, and the inner and outer walls of the sliding block (11) penetrated by the connecting rod are provided with a connecting block (15) fixedly connected to the connecting rod.

7. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: A workbench (21) arranged parallel to the turntable (1) is provided on the top of the large-diameter thin-walled component (5); the workbench (21) and the turntable (1) are arranged to rotate coaxially; and the workbench (21) is provided with a clamping claw (20) for clamping the top of the large-diameter thin-walled component (5).

8. The method for processing pure titanium large-diameter thin-walled parts according to claim 1 is characterized by: The following steps are involved: ① Rough turning reference of blank: select the unprocessed blank surface as the positioning reference; ② Rough turning of the inner and outer circles of the blank, controlling the deformation to ≤1mm; ③ Rough turning the inner circle, rough turning the outer circle, adjust the lifting mechanism and the pushing mechanism, continue to rough turn the bottom of the inner circle and the bottom of the outer circle, and rough turn the benchmark; ④ Natural aging for 24 hours to release stress; ⑤ Turning table, precision turning reference, control reference surface runout ≤ 0.1 mm; ⑥ Install the tooling (2) and level the tooling (2) to a surface runout of ≤0.05 mm; ⑦ Pressing process table, semi-finishing turning, finishing turning the inner and outer shapes of large diameter thin-walled parts (5); ⑧ Milling process groove; ⑨Adjust the lifting mechanism and pushing mechanism to fine-tune the inner and outer surfaces.

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