Roller electrode continuous contact type electric pulse rapid annealing apparatus and method

Abstract

The present application belongs to the technical field of metal material heat treatment, and particularly relates to a roller electrode continuous contact type electric pulse rapid annealing treatment device and method. The device comprises a base, a rotary table, a six-degree-of-freedom mechanism, an external spinning mechanism, an internal spinning mechanism, a roller electrode mechanism and a six-dimensional force sensor. A cylindrical workpiece is clamped between the rotary table and the six-degree-of-freedom mechanism. The six-dimensional force sensor is connected between the six-degree-of-freedom mechanism and the cylindrical workpiece. The internal spinning mechanism extends into the inner cavity of the cylindrical workpiece and abuts against the inner wall of the cylindrical workpiece. The external spinning mechanism and the roller electrode mechanism are oppositely arranged on the outer side of the cylindrical workpiece along the radial direction of the cylindrical workpiece. The external spinning mechanism, the roller electrode mechanism and the internal spinning mechanism act cooperatively to synchronously implement spinning forming and roller electrode electric pulse continuous annealing heat treatment on the cylindrical workpiece. The present application is suitable for rapid, continuous and accurate annealing treatment of large plate materials and complex curved surface components, and effectively improves the application range and automation level of electric pulse treatment.

Description

Technical Field

[0001] This invention belongs to the field of heat treatment technology for metallic materials, and specifically relates to a device and method for continuous contact electric pulse rapid annealing treatment with roller electrodes. Background Technology

[0002] With the increasing demand for large and complex metal components in the high-end equipment manufacturing sector, traditional heat treatment methods are gradually revealing their limitations in controlling the performance of complex structural materials. Current annealing treatments for metal materials typically employ overall heating methods such as resistance furnaces and box furnaces, achieving material microstructure recovery through prolonged heat treatment. However, these methods suffer from low heating efficiency, long processing cycles, and high energy consumption. Furthermore, the overall heating method makes it difficult to precisely control localized areas of large components, easily leading to unnecessary thermal impacts and excessive microstructure evolution.

[0003] Electrical pulse processing technology applies high-density pulsed current to the interior of materials, utilizing the instantaneous Joule heating effect to achieve rapid heating, providing an efficient method for controlling the microstructure of metallic materials. However, existing electrical pulse processing devices typically employ fixed clamping electrodes or point-contact electrode structures, maintaining a relatively fixed electrode position relative to the workpiece, making them suitable only for processing small, regularly shaped samples. When dealing with large plates, complex curved surfaces, and continuous processing requirements, traditional fixed electrodes suffer from limited contact area, constrained current range, difficulties in electrode transfer, and challenges in achieving large-area continuous processing. Especially for metallic components with complex spatial curvature, the constantly changing surface morphology makes it difficult for traditional electrodes to maintain stable contact, easily leading to uneven local contact pressure, unstable current distribution, and inconsistent processing results. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a roller electrode continuous contact type electric pulse rapid annealing device and method, which is intended to solve the problems of uneven local contact pressure, unstable current distribution, and inconsistent processing effects caused by the continuous changes in the surface morphology of metal components with complex spatial curvature.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a continuous contact electric pulse rapid annealing treatment device for roller electrodes, comprising a base, a turntable, a six-degree-of-freedom mechanism, an external spinning mechanism, an internal spinning mechanism, a roller electrode mechanism, and a six-dimensional force sensor. The turntable, the six-degree-of-freedom mechanism, and the internal spinning mechanism are sequentially arranged on the base. The cylindrical workpiece to be processed is clamped between the turntable and the six-degree-of-freedom mechanism. The six-dimensional force sensor is connected between the six-degree-of-freedom mechanism and the cylindrical workpiece, and the cylindrical workpiece is rotatable relative to the six-dimensional force sensor. The six-dimensional force sensor is used to collect force and deformation information of the cylindrical workpiece during processing. The internal spinning mechanism extends into the inner cavity of the cylindrical workpiece and abuts against the inner wall of the cylindrical workpiece. The external spinning mechanism and the roller electrode mechanism are arranged radially opposite to each other on the outer side of the cylindrical workpiece. The external spinning mechanism, the roller electrode mechanism, and the internal spinning mechanism work together to simultaneously perform spinning forming and continuous electric pulse annealing heat treatment on the cylindrical workpiece.

[0007] The base is equipped with a first servo moving mechanism, a second servo moving mechanism, and a third servo moving mechanism. The first servo moving mechanism is connected to the six-degree-of-freedom mechanism and can drive the six-degree-of-freedom mechanism to move in a direction closer to or further away from the turntable. The second servo moving mechanism is connected to the external spinning mechanism and is used to drive the external spinning mechanism to move along the axis of the turntable. The third servo moving mechanism is connected to the internal spinning mechanism and is used to drive the internal spinning mechanism to move along the axis of the turntable.

[0008] The six-degree-of-freedom mechanism includes a stationary plate, a moving plate, and multiple servo hydraulic cylinders. The stationary plate is connected to the first servo moving mechanism, and its axis is parallel to the base. One end of the moving plate is hinged to the stationary plate through multiple servo hydraulic cylinders arranged circumferentially, and the other end of the moving plate is connected to the six-dimensional force sensor. The multiple servo hydraulic cylinders work together to adjust the attitude of the moving plate.

[0009] The inner spinning mechanism includes an L-shaped column, a first radial servo motion mechanism, an inner spinning roller, a second radial servo motion mechanism, and an inner electrode roller. The L-shaped column includes a vertically connected vertical beam and a horizontal beam. The lower end of the vertical beam is connected to the base, and the horizontal beam extends into the inner cavity of the cylindrical workpiece. The first and second radial servo motion mechanisms are symmetrically arranged at the ends of the horizontal beams. The output ends of the first and second radial servo motion mechanisms are respectively provided with an inner electrode assembly and an inner spinning assembly. The first and second radial servo motion mechanisms are used to drive the inner electrode assembly and the inner spinning assembly to extend and retract radially along the cylindrical workpiece.

[0010] The inner electrode assembly includes an inner first motor and an inner electrode roller disposed at the output end of the inner first motor; the inner spinning assembly includes an inner second motor and an inner spinning roller disposed at the output end of the inner second motor; the inner electrode roller and the inner spinning roller respectively abut against the inner wall of the cylindrical workpiece.

[0011] The generatrix of the inner electrode roller and the inner spinning roller is elliptical, and they are in point contact with the inner wall of the cylindrical workpiece.

[0012] The roller electrode mechanism includes a six-degree-of-freedom robot and a discharge roller disposed at the end of the six-degree-of-freedom robot. The discharge roller corresponds to the inner electrode roller. The generatrix of the discharge roller is elliptical and makes point contact with the outer surface of the cylindrical workpiece.

[0013] The external spinning mechanism includes a moving arm and an external spinning wheel. The moving arm is mounted on the second servo moving mechanism, and its end is provided with an external spinning wheel corresponding to the inner spinning roller. The outer surface shape of the external spinning wheel matches the pre-formed contour of the cylindrical workpiece.

[0014] The motion arm includes a column, a slide table, and a crossbeam. The lower end of the column is connected to the second servo moving mechanism. A fourth servo moving mechanism is provided inside the column. The slide table is connected to the fourth servo moving mechanism, which is used to drive the slide table to rise and fall. A fifth servo moving mechanism is provided inside the slide table and is connected to the crossbeam. The fifth servo moving mechanism is used to drive the crossbeam to move radially along the cylindrical workpiece. The end of the crossbeam is provided with the external spinning wheel.

[0015] The cylindrical workpiece includes a rotating shell and interface plates I and II at both ends of the rotating shell. The two ends of the rotating shell are provided with forming structures. The forming structures include an outwardly convex rotating shell and inwardly concave rotating shells located on both sides of the outwardly convex rotating shell.

[0016] Another aspect of the present invention provides a method for rapid annealing of roller electrodes by continuous contact electrical pulse based on the device described above, comprising the following steps:

[0017] Step S1: Clamp the cylindrical workpiece between the turntable and the six-degree-of-freedom mechanism, and place the six-dimensional force sensor between the six-degree-of-freedom mechanism and the cylindrical workpiece;

[0018] Step S2: Drive the inner spinning mechanism to extend into the inner cavity of the cylindrical workpiece and press against the inner wall of the cylindrical workpiece;

[0019] Step S3: Control the external spinning mechanism and roller electrode mechanism to be arranged radially on the outside of the cylindrical workpiece;

[0020] Step S4: The external spinning mechanism, the roller electrode mechanism and the internal spinning mechanism work together to simultaneously perform spinning forming operation on the cylindrical workpiece and continuous annealing heat treatment by roller electrode electric pulse.

[0021] Step S5: During the processing, the force and deformation information of the cylindrical workpiece is collected in real time by a six-dimensional force sensor.

[0022] The present invention has the following beneficial effects and advantages:

[0023] This invention proposes a continuous contact electric pulse rapid annealing device using roller electrodes. It replaces traditional fixed clamping electrodes with conductive roller electrodes positioned on both sides of the workpiece, establishing a dynamic current transmission channel through the rolling contact between the rollers and the workpiece surface. During processing, motion control and path planning technologies enable the roller electrodes to move continuously along a predetermined path, causing the electric pulse application area to continuously change with the electrode movement. This allows for precise movement of the roller electrodes along complex structural surfaces, enabling localized, continuous electric pulse rapid heating and annealing of large and complex curved metal components, promoting material recovery, recrystallization, and optimization of microstructure and properties. Simultaneously, by adjusting the roller electrode movement trajectory, electrode contact state, and electric pulse parameters, precise control of material microstructure and properties in different areas can be achieved. This invention is adaptable to metal components with different structural forms, and is particularly suitable for rapid, continuous, and precise annealing of large plates and complex curved components, effectively improving the applicability and automation level of electric pulse processing.

[0024] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is one of the isometric views of the roller electrode continuous contact type electric pulse rapid annealing treatment device of the present invention;

[0028] Figure 2 This is the second isometric view of the roller electrode continuous contact type electric pulse rapid annealing treatment device of the present invention;

[0029] Figure 3This is the third isometric view of the roller electrode continuous contact type electric pulse rapid annealing treatment device of the present invention;

[0030] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0031] Figure 5 This is a horizontal cross-sectional view of the roller electrode continuous contact type electric pulse rapid annealing treatment device of the present invention.

[0032] In the diagram: 1. Base; 2. Turntable; 3. Cylindrical workpiece; 301. Interface plate I; 302. Interface plate II; 303. Rotary shell; 304. Concave rotary shell; 305. Convex rotary shell; 4. Six-degree-of-freedom mechanism; 401. Stationary plate; 402. Servo hydraulic cylinder; 403. Moving plate; 5. External spinning mechanism; 501. Column; 502. Slide table; 503. Crossbeam; 504. External spinning roller; 6. Internal spinning mechanism; 601. L-shaped column; 602. First radial servo motion mechanism; 603. Internal electrode roller; 604. Second radial servo motion mechanism; 605. Internal spinning roller; 7. Roller electrode mechanism; 701. Six-degree-of-freedom robot; 702. Discharge roller; 8. Six-dimensional force sensor; 9. Four-point ball slewing bearing. Detailed Implementation

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] See Figures 1 to 5As shown, an embodiment of the present invention provides a roller electrode continuous contact type electric pulse rapid annealing treatment device, including a base 1, a turntable 2, a six-degree-of-freedom mechanism 4, an external spinning mechanism 5, an internal spinning mechanism 6, a roller electrode mechanism 7, and a six-dimensional force sensor 8. The turntable 2, the six-degree-of-freedom mechanism 4, and the internal spinning mechanism 6 are sequentially arranged on the base 1. The cylindrical workpiece 3 to be processed is clamped between the turntable 2 and the six-degree-of-freedom mechanism 4. The six-dimensional force sensor 8 is connected between the six-degree-of-freedom mechanism 4 and the cylindrical workpiece 3. The workpiece 3 can rotate relative to the six-dimensional force sensor 8, which is used to collect the force and deformation information of the cylindrical workpiece 3 during the processing. The inner spinning mechanism 6 extends into the inner cavity of the cylindrical workpiece 3 and abuts against the inner wall of the cylindrical workpiece 3. The outer spinning mechanism 5 and the roller electrode mechanism 7 are arranged radially opposite to each other on the outer side of the cylindrical workpiece 3. The outer spinning mechanism 5, the roller electrode mechanism 7 and the inner spinning mechanism 6 work together to simultaneously perform spinning forming and roller electrode electric pulse continuous annealing heat treatment on the cylindrical workpiece 3.

[0036] See Figure 4 As shown, in an embodiment of the present invention, the cylindrical workpiece 3 includes a rotary shell 303 and interface plates I 301 and II 302 welded to both ends of the rotary shell 303. Interface plate I 301 is fixedly connected to the turntable 2, and the fixing method includes, but is not limited to, conventional mounting methods such as bolt connection and positioning surface clamping. Interface plate II 302 is connected to a six-dimensional force sensor 8 through a four-point ball rotary bearing 9. The four-point ball rotary bearing 9 is used to construct a rotary pair between the cylindrical workpiece 3 and the six-dimensional force sensor 8, realizing the rotary motion of the cylindrical workpiece 3 relative to the six-dimensional force sensor 8. By performing spinning heat treatment processing on both ends of the rotary shell 303 through the device provided by the present invention, the two ends of the rotary shell 303 are deformed into two protruding shaped structures. Specifically, the shaped structure includes an outwardly convex rotary shell 305 and an inwardly concave rotary shell 304 located on both sides of the outwardly convex rotary shell 305.

[0037] In an embodiment of the present invention, a first servo moving mechanism, a second servo moving mechanism, and a third servo moving mechanism are disposed within the base 1. The first servo moving mechanism is connected to a six-degree-of-freedom mechanism 4 and can drive the six-degree-of-freedom mechanism 4 to move in a direction closer to or further away from the turntable 2. The second servo moving mechanism is connected to an external spinning mechanism 5 and is used to drive the external spinning mechanism 5 to move along the axial direction of the turntable 2. The third servo moving mechanism is connected to an inner spinning mechanism 6 and is used to drive the inner spinning mechanism 6 to move along the axial direction of the turntable 2.

[0038] Furthermore, the base 1 is also equipped with a rotary drive mechanism for driving the turntable 2 to rotate, and the rotation axis of the turntable 2 is parallel to the ground.

[0039] See Figure 3 and Figure 4 As shown, in an embodiment of the present invention, the six-degree-of-freedom mechanism 4 is preferably a parallel six-degree-of-freedom hydraulic mechanism; specifically, the six-degree-of-freedom mechanism 4 includes a stationary plate 401, a moving plate 403, and a plurality of servo hydraulic cylinders 402. The stationary plate 401 is connected to the first servo moving mechanism, and its axis is parallel to the base 1. One end of the moving plate 403 is hinged to the stationary plate 401 through a plurality of servo hydraulic cylinders 402 arranged circumferentially, and the other end of the moving plate 403 is connected to a six-dimensional force sensor 8. The plurality of servo hydraulic cylinders 402 work together to adjust the attitude of the moving plate 403.

[0040] In this embodiment, six servo hydraulic cylinders 402 are used. The tail end of the cylinder body of each servo hydraulic cylinder 402 is connected to the stationary plate 401 through a spatial ball joint, and the head of the cylinder rod of each servo hydraulic cylinder 402 is connected to the moving plate 403 through a spatial ball joint. The six-degree-of-freedom mechanism 4 can adjust the spatial position and attitude of the moving plate 403 relative to the stationary plate 401, realize the anti-deformation correction of the interface plate I 301 and interface plate II 302 of the cylindrical workpiece 3, and ensure the positional accuracy of the two interface plates.

[0041] See Figure 2 and Figure 5 As shown, in an embodiment of the present invention, the inner spinning mechanism 6 includes an L-shaped column 601, a first radial servo motion mechanism 602, an inner spinning roller 603, a second radial servo motion mechanism 604, and an inner electrode roller 605. The L-shaped column 601 includes a vertically connected vertical beam and a horizontal beam. The lower end of the vertical beam is connected to a third servo moving mechanism in the base 1. The horizontal beam extends into the inner cavity of the cylindrical workpiece 3. The first radial servo motion mechanism 602 and the second radial servo motion mechanism 604 are symmetrically arranged at the ends of the horizontal beam. The output ends of the first radial servo motion mechanism 602 and the second radial servo motion mechanism 604 are respectively provided with an inner electrode assembly and an inner spinning assembly. The first radial servo motion mechanism 602 and the second radial servo motion mechanism 604 are respectively used to drive the inner electrode assembly and the inner spinning assembly to extend and retract radially along the cylindrical workpiece 3. The inner electrode assembly includes an inner first motor and an inner electrode roller 603 disposed at the output end of the inner first motor; the inner spinning assembly includes an inner second motor and an inner spinning roller 605 disposed at the output end of the inner second motor; the inner electrode roller 603 and the inner spinning roller 605 respectively abut against the inner wall of the cylindrical workpiece 3.

[0042] Furthermore, the generatrices of the inner electrode roller 603 and the inner spinning roller 605 are elliptical and make point contact with the inner wall of the cylindrical workpiece 3.

[0043] See Figure 2 and Figure 5As shown, in an embodiment of the present invention, the roller electrode mechanism 7 includes a six-degree-of-freedom robot 701 and a discharge roller 702 disposed at the execution end of the six-degree-of-freedom robot 701. The discharge roller 702 corresponds to the inner electrode roller 603. The generatrix of the discharge roller 702 is elliptical and forms point contact with the outer surface of the cylindrical workpiece 3, and the contact conforms to Hertzian contact theory. The inner electrode roller 603 and the discharge roller 702 are respectively arranged on the inner and outer sides of the cylindrical workpiece 3 to form a partial discharge circuit, making full use of the electroplastic effect and reducing the adverse effects of the skin effect.

[0044] See Figure 2 and Figure 5 As shown in the embodiment of the present invention, the external spinning mechanism 5 includes a moving arm and an external spinning wheel 504. The moving arm is mounted on the second servo moving mechanism, and its end is provided with an external spinning wheel 504 corresponding to the inner spinning roller 605. The outer surface shape of the external spinning wheel 504 matches the outer contour of the forming structure of the cylindrical workpiece 3. The inner spinning roller 605 and the external spinning wheel 504 cooperate with each other to form a forming structure of the cylindrical workpiece 3 including a convex rotating shell 305 and concave rotating shells 304 located on both sides of the convex rotating shell 305.

[0045] In an embodiment of the present invention, the motion arm includes a column 501, a slide table 502, and a crossbeam 503. The lower end of the column 501 is connected to a second servo moving mechanism, and a fourth servo moving mechanism is provided inside the column 501. The slide table 502 is connected to the fourth servo moving mechanism, which drives the slide table 502 to rise and fall. A fifth servo moving mechanism is provided inside the slide table 502 and is connected to the crossbeam 503. The fifth servo moving mechanism drives the crossbeam 503 to move radially along the cylindrical workpiece 3. An external spinning wheel 504 is provided at the end of the crossbeam 503. A spinning wheel rotation drive module connected to the external spinning wheel 504 is provided inside the crossbeam 503, which drives the external spinning wheel 504 to rotate.

[0046] An embodiment of the present invention provides a roller electrode continuous contact type electric pulse rapid annealing treatment device, the working principle of which is as follows:

[0047] During processing, one end of the cylindrical workpiece 3 is fixed by the turntable 2, and the other end is connected to the six-dimensional force sensor 8 through a four-point ball slewing bearing 9. The four-point ball slewing bearing 9 allows the cylindrical workpiece 3 to rotate freely relative to the moving disk 403. The turntable 2 drives the cylindrical workpiece 3 to rotate continuously. The first servo moving mechanism and the third servo moving mechanism on the base 1 drive the six-degree-of-freedom mechanism 4 and the inner spinning mechanism 6 to move precisely along the workpiece axis, respectively. The first radial servo motion mechanism 602 and the second radial servo motion mechanism 604 drive the inner electrode roller 603 and the inner spinning roller 605 to feed radially, respectively. The inner spinning roller 605 and the outer spinning roller 504 squeeze and cooperate with each other, so that the cylindrical workpiece 3 is gradually deformed and integrally formed into a shape with an inner concave rotating shell 304 and an outer convex rotating shell 504. The forming structure of the rotating shell 305: The inner electrode roller 603 and the discharge roller 702 are respectively placed on the inner and outer surfaces of the cylindrical workpiece 3. A dynamic current transmission channel is established through the rolling contact between the inner electrode roller 603 and the discharge roller 702 and the inner and outer surfaces of the workpiece, forming a partial discharge circuit. The electroplastic effect is used to improve the plasticity of the material while weakening the skin effect. During the processing, combined with motion control and path planning technology, the discharge roller 702 can move continuously along a predetermined path, so that the area of ​​electric pulse action changes continuously with the movement of the electrode. This achieves precise movement of the roller electrode along the complex structural surface, thereby completing the local and continuous electric pulse rapid heating and annealing treatment of large and complex curved metal components, promoting material recovery, recrystallization and optimization of microstructure and properties. At the same time, by controlling the motion trajectory of the discharge roller 702, the electrode contact state and the electric pulse parameters, the microstructure and properties of the material in different areas can be precisely controlled. The six-dimensional force sensor 8 collects stress changes and stress release trends in real time during the spinning process, and provides feedback to control the feed actions of each servo motion mechanism, so as to realize the simultaneous spinning forming and electrical pulse-assisted modification, and complete the integrated processing of irregular rotating shells.

[0048] In summary, this device fully leverages the electroplastic effect and effectively weakens the skin effect by forming a dual-sided partial discharge circuit between the inner electrode roller and the outer discharge roller on both sides of the workpiece. Relying on the coordinated operation of the inner and outer spinning rollers, it can integrally form a concave and convex rotary structure on a cylindrical workpiece. At the same time, it is equipped with a six-dimensional force sensor to detect the trend of spinning stress release in real time, combined with a four-point ball slewing bearing to release the workpiece's rotational degrees of freedom, and with multiple sets of servo moving mechanisms to achieve precise axial and radial adjustment of each actuator, it can realize the simultaneous operation of spinning forming and electropulse assisted annealing, improve the material forming performance, suppress forming defects, and significantly improve the processing accuracy and forming quality of irregularly shaped rotary shell workpieces.

[0049] See Figures 1 to 5 As shown, another embodiment of the present invention provides a method for rapid annealing of roller electrodes by continuous contact electrical pulse based on the device described above, comprising the following steps:

[0050] Step S1: Clamp the cylindrical workpiece 3 between the turntable 2 and the six-degree-of-freedom mechanism 4, and place the six-dimensional force sensor 8 between the six-degree-of-freedom mechanism 4 and the cylindrical workpiece 3;

[0051] Step S2: Drive the inner spinning mechanism 6 to extend into the inner cavity of the cylindrical workpiece 3 and press against the inner wall of the cylindrical workpiece 3;

[0052] Step S3: Control the external spinning mechanism 5 and the roller electrode mechanism 7 to be arranged radially on the outside of the cylindrical workpiece 3;

[0053] Step S4: The external spinning mechanism 5, the roller electrode mechanism 7 and the internal spinning mechanism 6 work together to simultaneously perform spinning forming and roller electrode electric pulse continuous annealing heat treatment on the cylindrical workpiece 3.

[0054] Step S5: During the processing, the force and deformation information of the cylindrical workpiece 3 is collected in real time by the six-dimensional force sensor 8.

[0055] In this embodiment, the cylindrical workpiece 3 is provided with interface plate I 301 and interface plate II 302. The residual stress and deformation generated by the workpiece in real time during the rolling process can be detected and sensed online by a six-dimensional force sensor 8. For the residual stress and workpiece deformation caused by rolling, the form and position correction can be achieved by the six-degree-of-freedom mechanism 4 and the external spinning mechanism 5 working together. The prior art generally adopts the roller line contact form, while the present invention adopts the roller point contact scheme. The existing roller line contact structure is difficult to adapt to the complex curved surface with concave rotating shell 303 and convex rotating shell 305. At the same time, the existing line contact scheme is easily affected by the skin effect, and the charge accumulates at both ends of the contact line segment, resulting in a local electric field strength that is too high. The reason for this is that there is a mutual repulsion between the same charge, which leads to uneven lattice softening. If the prior art is directly and equivalently replaced by the structure of the present invention, it will produce the defect of uneven electroplastic effect: it will easily cause local coarse grains in the workpiece, reduce the structural rigidity, and make it difficult to effectively eliminate residual stress in some areas, ultimately reducing the workpiece machining accuracy and causing process conflicts.

[0056] In summary, another embodiment of the present invention provides a roller electrode continuous contact type electropulse rapid annealing method, which relies on the inner and outer rollers of the workpiece to form a point contact partial discharge circuit, effectively alleviating the problems of charge accumulation and uneven lattice softening caused by the skin effect, and giving full play to the electroplastic effect to improve the material forming performance. During the processing, a six-dimensional force sensor is used to monitor the residual stress and deformation state of the workpiece in real time, and the six-degree-of-freedom mechanism and the external spinning mechanism are used to correct the workpiece shape and position error. The roller point contact form can be adapted to complex irregular rotating surfaces with concave rotating shells and convex rotating shells, so as to realize the simultaneous implementation of spinning forming and electropulse assisted modification, avoiding defects such as coarse grains and difficulty in eliminating residual stress caused by uneven electroplastic effect, significantly improving the forming accuracy and structural performance of irregular cylindrical workpieces, and simplifying the processing flow.

[0057] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A roller electrode continuous contact type electric pulse rapid annealing treatment device, characterized in that, The system includes a base (1), a turntable (2), a six-degree-of-freedom mechanism (4), an external spinning mechanism (5), an internal spinning mechanism (6), a roller electrode mechanism (7), and a six-dimensional force sensor (8). The turntable (2), the six-degree-of-freedom mechanism (4), and the internal spinning mechanism (6) are sequentially arranged on the base (1). The cylindrical workpiece (3) to be processed is clamped between the turntable (2) and the six-degree-of-freedom mechanism (4). The six-dimensional force sensor (8) is connected between the six-degree-of-freedom mechanism (4) and the cylindrical workpiece (3), and the cylindrical workpiece (3) can rotate relative to the six-dimensional force sensor (8). The six-dimensional force sensor (8) is used to collect the force and deformation information of the cylindrical workpiece (3) during the processing; the inner spinning mechanism (6) extends into the inner cavity of the cylindrical workpiece (3) and abuts against the inner wall of the cylindrical workpiece (3); the outer spinning mechanism (5) and the roller electrode mechanism (7) are arranged opposite to each other on the outer side of the cylindrical workpiece (3) along the radial direction; the outer spinning mechanism (5), the roller electrode mechanism (7) and the inner spinning mechanism (6) work together to simultaneously perform spinning forming and roller electrode electric pulse continuous annealing heat treatment on the cylindrical workpiece (3).

2. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 1, characterized in that, The base (1) is equipped with a first servo moving mechanism, a second servo moving mechanism and a third servo moving mechanism. The first servo moving mechanism is connected to the six-degree-of-freedom mechanism (4) and can drive the six-degree-of-freedom mechanism (4) to move in a direction close to or away from the turntable (2). The second servo moving mechanism is connected to the external spinning mechanism (5) and is used to drive the external spinning mechanism (5) to move in the axial direction of the turntable (2). The third servo moving mechanism is connected to the internal spinning mechanism (6) and is used to drive the internal spinning mechanism (6) to move in the axial direction of the turntable (2).

3. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 2, characterized in that, The six-degree-of-freedom mechanism (4) includes a stationary plate (401), a moving plate (403), and multiple servo hydraulic cylinders (402). The stationary plate (401) is connected to the first servo moving mechanism and its axis is parallel to the base (1). One end of the moving plate (403) is hinged to the stationary plate (401) through multiple servo hydraulic cylinders (402) arranged circumferentially. The other end of the moving plate (403) is connected to the six-dimensional force sensor (8). The multiple servo hydraulic cylinders (402) work together to adjust the attitude of the moving plate (403).

4. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 1, characterized in that, The inner spinning mechanism (6) includes an L-shaped column (601), a first radial servo motion mechanism (602), an inner spinning roller (603), a second radial servo motion mechanism (604), and an inner electrode roller (605). The L-shaped column (601) includes a vertically connected vertical beam and a horizontal beam. The lower end of the vertical beam is connected to the base (1), and the horizontal beam extends into the inner cavity of the cylindrical workpiece (3). The first radial servo motion mechanism (602) and the second radial servo motion mechanism (604) are symmetrically arranged at the ends of the horizontal beam. The output ends of the first radial servo motion mechanism (602) and the second radial servo motion mechanism (604) are respectively provided with an inner electrode assembly and an inner spinning assembly. The first radial servo motion mechanism (602) and the second radial servo motion mechanism (604) are respectively used to drive the inner electrode assembly and the inner spinning assembly to extend and retract radially along the cylindrical workpiece (3). The inner electrode assembly includes an inner first motor and an inner electrode roller (603) disposed at the output end of the inner first motor; the inner spinning assembly includes an inner second motor and an inner spinning roller (605) disposed at the output end of the inner second motor; the inner electrode roller (603) and the inner spinning roller (605) respectively abut against the inner wall of the cylindrical workpiece (3).

5. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 4, characterized in that, The generatrices of the inner electrode roller (603) and the inner spinning roller (605) are elliptical and make point contact with the inner wall of the cylindrical workpiece (3).

6. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 4, characterized in that, The roller electrode mechanism (7) includes a six-degree-of-freedom robot (701) and a discharge roller (702) disposed at the execution end of the six-degree-of-freedom robot (701). The discharge roller (702) corresponds to the inner electrode roller (603). The generatrix of the discharge roller (702) is elliptical and makes point contact with the outer surface of the cylindrical workpiece (3).

7. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 4, characterized in that, The external spinning mechanism (5) includes a moving arm and an external spinning wheel (504), wherein the moving arm is mounted on the second servo moving mechanism and the end is provided with an external spinning wheel (504) corresponding to the inner spinning roller (605), and the outer surface shape of the external spinning wheel (504) matches the pre-formed contour of the cylindrical workpiece (3).

8. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 7, characterized in that, The motion arm includes a column (501), a slide (502), and a crossbeam (503). The lower end of the column (501) is connected to the second servo moving mechanism. A fourth servo moving mechanism is provided inside the column (501). The slide (502) is connected to the fourth servo moving mechanism. The fourth servo moving mechanism is used to drive the slide (502) to rise and fall. A fifth servo moving mechanism is provided inside the slide (502). The fifth servo moving mechanism is connected to the crossbeam (503). The fifth servo moving mechanism is used to drive the crossbeam (503) to move radially along the cylindrical workpiece (3). The end of the crossbeam (503) is provided with the external spinning wheel (504).

9. The roller electrode continuous contact type electric pulse rapid annealing treatment device according to claim 1, characterized in that, The cylindrical workpiece (3) includes a rotary shell (303) and interface plates I (301) and II (302) at both ends of the rotary shell (303). The rotary shell (303) has forming structures at both ends. The forming structures include an outwardly convex rotary shell (305) and inwardly concave rotary shells (304) located on both sides of the outwardly convex rotary shell (305).

10. A method for continuous contact electric pulse rapid annealing of roller electrodes based on the device according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Clamp the cylindrical workpiece (3) between the turntable (2) and the six-degree-of-freedom mechanism (4), and place the six-dimensional force sensor (8) between the six-degree-of-freedom mechanism (4) and the cylindrical workpiece (3); Step S2: Drive the inner spinning mechanism (6) to extend into the inner cavity of the cylindrical workpiece (3) and press against the inner wall of the cylindrical workpiece (3); Step S3: Control the external spinning mechanism (5) and the roller electrode mechanism (7) to be arranged radially on the outside of the cylindrical workpiece (3); Step S4: The external spinning mechanism (5), the roller electrode mechanism (7) and the internal spinning mechanism (6) work together to simultaneously perform spinning forming operation and roller electrode electric pulse continuous annealing heat treatment on the cylindrical workpiece (3); Step S5: During the processing, the force and deformation information of the cylindrical workpiece (3) is collected in real time by a six-dimensional force sensor (8).

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