Pulse current auxiliary rolling device and method for partitioned power supply of double-sided conductive roller

Abstract

The invention relates to the technical field of plastic forming equipment, in particular to a position-adjustable electric pulse auxiliary rolling electrifying device and method.The device comprises a rack, movable self-adaptive conductive roller assemblies are fixedly connected to the front portion and the rear portion of the rack, and the upper conductive roller end and the lower conductive roller end of each conductive roller assembly are fixedly connected with a conductive sliding ring; the conductive slip ring is fixedly connected with the middle cavity part of the conductive supporting seat; the force applied by the limiting rod spring can adapt to the thickness and surface change of a to-be-processed metal plate strip; the detection device detects the temperature state of the metal plate strip to be machined, and pulse current parameters are adjusted in time according to temperature feedback. Front, rear, upper and lower conductive rollers of the rack are in rolling contact with a to-be-machined metal plate strip to form a complete closed loop. According to the invention, plates of multiple specifications can be uniformly electrified, and the front and back effective electrifying distance can be randomly adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic forming equipment, and particularly to a position-adjustable electric pulse-assisted rolling energizing device and method. Background Art

[0002] Pulsed current is a means of energy transmission with highly concentrated instantaneous energy, which can enable substances to quickly obtain temperature rise. Different from traditional heating and heat preservation means, pulsed current reduces the deformation resistance of metal materials through electroplasticity (non-thermal effect) and Joule effect, promotes dislocation slip and grain refinement, and improves the plastic deformation ability.

[0003] The rolling of metal sheet and strip requires high-precision rolling mills. At the same time, for special metal materials, due to their poor mechanical properties, it is very difficult to roll them into thin strips. Introducing pulsed current during the rolling process, firstly, the rolling force can be significantly reduced through the electroplastic effect of pulsed current, effectively protecting the rolling mill; secondly, the plastic properties of metal materials can be improved by promoting dislocation slip and grain refinement; thirdly, by reducing the stress concentration at grain boundaries and promoting dynamic recrystallization, the grain distribution can be made more uniform; fourthly, reducing the number of rolling passes, reducing equipment energy consumption, and conforming to the trend of green manufacturing.

[0004] Therefore, the invention of the pulsed current-assisted rolling device is of extremely important significance for the field of sheet and strip rolling. Summary of the Invention

[0005] To solve the following problems in the traditional sheet and strip rolling process: high energy consumption, serious work hardening, and long production cycle, the present invention introduces pulsed current during the rolling process through a pulsed current-assisted rolling device, reduces the rolling force, improves the plastic deformation ability, promotes dynamic recrystallization, makes the grain distribution uniform, reduces the number of rolling passes, improves efficiency, and reduces energy consumption.

[0006] To achieve the above objectives, the present invention provides the following solutions: A pulse current assisted rolling device with zoned power supply for double-sided conductive rollers, characterized in that it comprises a pulse power supply (1), a frame (2), a movable adaptive conductive roller assembly (3) and a detection assembly (6); the frame (2) is fixedly connected with a group of movable adaptive conductive roller assemblies (3) at the front and rear ends, and the movable adaptive conductive roller assemblies (3) at the front and rear ends have the same structure; the adaptive conductive roller assembly comprises: the conductive roller (20) forms rolling electrical contact with the metal plate (4), the two ends of the conductive roller (20) are respectively fixedly connected to the rotor (21) of the conductive slip ring (22); the intermediate cavity portion between the rotor end (21) and the stator end (23) of the conductive slip ring (22) is fixedly connected to the conductive roller support seat (25); the limit rod (9) passes through the conductive roller support seat connecting plate (19), the spring (18), and the spring support connecting plate (17) in sequence in the vertical direction, and is locked by a nut, wherein the conductive roller support seat (25) can slide up and down along the limit rod (9) and is elastically supported by the spring (18).

[0007] A further optimized solution, according to claim 1, is characterized in that: the rear support plate (15) and the front support plate (7) of the mobile adaptive conductive roller assembly (3) are fixedly connected via front and rear support connecting plates (14); a lead screw (13) and an optical axis (10) are arranged on the rear support plate (15), a lead screw nut (8) and a linear bearing (16) are arranged on the top of the spring support connecting plate (18), the spring support connecting plate (17) is threadedly connected to the lead screw (13) via the lead screw nut (8), and is slidably connected to the optical axis (10) via the linear bearing (16); the servo motor (12) is transmission-connected to the lead screw (13) via a coupling (11), and is used to rotate the lead screw (13) and drive the spring support connecting plate (17) to move along the lead screw (13).

[0008] A further optimized solution is provided according to claim 1, wherein the movable adaptive conductive roller assembly (3) is characterized in that: the conductive rollers (20) at the upper and lower ends of the movable adaptive conductive roller assembly (3) are connected to the wire (23) of the power circuit switch part (5) through the stator end (23) of the conductive slip ring (22); the power circuit switch (5) of the movable adaptive conductive roller assembly (3) on the inlet side of the frame (2) is connected to the positive electrode of the pulse power supply (1), and the power circuit switch (5) of the movable adaptive conductive roller assembly (3) on the outlet side of the frame (2) is connected to the negative electrode (1) of the pulse power supply, so that the internal current of the metal sheet (4) flows from the inlet direction of the rolling mill to the outlet direction of the rolling mill, forming a complete power circuit.

[0009] Further optimization solution. According to the movable adaptive conductive roller assembly (3) described in claim 3, it is characterized in that: the energized circuit switch part (5) can select the circuit application method, (a) both the positive electrode and the negative electrode are in contact with the upper surface of the metal sheet (4); (b) both the positive electrode and the negative electrode are in contact with the lower surface of the metal sheet (4); (c) the positive electrode is in contact with the upper surface of the metal sheet (4), and the negative electrode is in contact with the lower surface of the metal sheet (4). Different circuit application methods can be achieved by selecting different conductive roller contact methods, and then the effects of different circuit application methods on the metal sheet can be explored.

[0010] Further optimization solution. According to the movable adaptive conductive roller assembly (3) described in claim 1, it is characterized in that: the detection assembly includes an infrared temperature measurement device (6), which is fixedly connected to the conductive roller support seat connecting plate (19) and is used to detect the rolling temperature of the metal sheet (4) in real time. Real-time temperature measurement can compare the temperature rise characteristics of different modes and screen the optimal solution.

[0011] Further optimization solution. A pulse current assisted rolling method is characterized in that it applies the pulse current assisted rolling device with double-sided conductive roller zone power supply described in any one of claims 1-5, and includes the following steps: S1: According to the initial thickness of the metal sheet (4) and the target thickness of the metal sheet (4) to be rolled, adjust the nuts in the inlet and outlet conductive roller assemblies (3) to indirectly adjust the distance between the conductive rollers (20) in the inlet and outlet conductive roller assemblies (3). The distance on the inlet side is consistent with the initial thickness of the metal sheet (4), and the distance on the outlet side is consistent with the target thickness of the metal sheet (4), so that the conductive rollers (20) are in full contact with the metal sheet (4); S2: Confirm the distance between the conductive rollers (20) according to the thickness of the metal sheet (4) to be processed and confirm the elastic force of the corresponding spring (18); S3: According to the length of the metal sheet (4), select an appropriate front-back distance of the conductive roller assembly (3) and control the energization duration; S4: According to the test requirements, adjust the energized circuit switch part (5) to select the circuit application method and perform pulse current assisted rolling; S5: Supply power to the energized circuit switch part (5) through the pulse power supply (1) to apply pulse current to the conductive roller assembly (3) and the metal sheet (4) to be processed. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the action position and assembly of the present invention; Figure 2 It is a schematic diagram of the whole of the present invention; Figure 3 It is a schematic diagram of the application of the conductive slip ring of the present invention; Figure 4 Schematic diagram of the conductive roller assembly of the present invention; Figure 5 Schematic diagram of the alloy sheet rolled at room temperature; Figure 6 Schematic diagram of the alloy sheet rolled by the present embodiment; Figure 7 Microscopic schematic diagram of the alloy sheet rolled at room temperature; Figure 8 Microscopic schematic diagram of the alloy sheet rolled by the present embodiment; Wherein, 1. Pulse power supply; 2. Frame; 3. Moving adaptive conductive roller assembly; 4. Metal sheet; 5. Energizing circuit switch part; 6. Infrared temperature measuring device; 7. Front support plate; 8. Lead screw nut; 9. Limit rod; 10. Optical axis; 11. Coupling; 12. Servo motor; 13. Lead screw; 14. Front and rear support connecting plate; 15. Rear support plate; 16. Linear bearing; 17. Spring support connecting plate; 18. Spring; 19. Conductive roller support seat connecting plate; 20. Conductive roller; 21. Rotor end; 22. Conductive slip ring; 23. Stator end; 24. Wire; 25. Conductive roller support seat; 26. Insulating mica gasket. Detailed implementation manners

[0013] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0014] Referring to Figure 1-4 , a pulse current assisted rolling device with zoned power supply for double-sided conductive rollers, characterized in that: it includes a pulse power supply (1), a frame (2), a moving adaptive conductive roller assembly (3) and a detection component (6); a set of moving adaptive conductive roller assemblies (3) are fixedly connected to the front and rear of the frame (2), and the moving adaptive conductive roller assemblies (3) at the front end and the rear end have the same structure; the adaptive conductive roller assembly includes: the conductive roller (20) forms a rolling electrical contact with the metal sheet (4), and both ends of the conductive roller (20) are fixedly connected to the rotor (21) of the conductive slip ring (22); the middle cavity part between the rotor end (21) and the stator end (23) of the conductive slip ring (22) is fixedly connected to the conductive roller support seat (25); the limit rod (9) sequentially passes through the conductive roller support seat connecting plate (19), the spring (18), and the spring support connecting plate (17) in the vertical direction and is locked by a nut. Among them, the conductive roller support seat (25) can slide up and down along the limit rod (9) and is elastically supported by the spring (18).

[0015] Further optimized solution. According to the mobile adaptive conductive roller assembly (3) described in claim 1, it is characterized in that: a front and rear support connecting plate (14) is fixedly connected between the rear support plate (15) and the front support plate (7) of the mobile adaptive conductive roller assembly (3); a lead screw (13) and a smooth shaft (10) are arranged on the rear support plate (15), a lead screw nut (8) and a linear bearing (16) are arranged at the top of the spring support connecting plate (18), the spring support connecting plate (17) is threadedly connected with the lead screw (13) through the lead screw nut (8) and is slidably connected with the smooth shaft (10) through the linear bearing (16); a servo motor (12) is drivingly connected with the lead screw (13) through a coupling (11) and is used for rotating the lead screw (13) and driving the spring support connecting plate (17) to move along the lead screw (13).

[0016] Further optimized solution. According to the mobile adaptive conductive roller assembly (3) described in claim 1, it is characterized in that: both the upper and lower conductive rollers (20) of the mobile adaptive conductive roller assembly (3) are connected with the wire (23) of the energized circuit switch part (5) through the stator end (23) of a slip ring (22); the energized circuit switch (5) of the mobile adaptive conductive roller assembly (3) on the inlet side of the frame (2) is connected to the positive pole of a pulse power supply (1), and the energized circuit switch (5) of the mobile adaptive conductive roller assembly (3) on the outlet side of the frame (2) is connected to the negative pole of the pulse power supply (1), so that the current inside the metal sheet (4) flows from the inlet direction of the rolling mill to the outlet direction of the rolling mill, forming a complete energized loop.

[0017] Further optimized solution. According to the mobile adaptive conductive roller assembly (3) described in claim 3, it is characterized in that: the energized circuit switch part (5) can select the circuit application method, (a) both the positive pole and the negative pole are in contact with the upper surface of the metal sheet (4); (b) both the positive pole and the negative pole are in contact with the lower surface of the metal sheet (4); (c) the positive pole is in contact with the upper surface of the metal sheet (4) and the negative pole is in contact with the lower surface of the metal sheet (4). By selecting different conductive roller contact methods, different circuit application methods can be achieved, and then the effects of different circuit application methods on the metal sheet can be explored.

[0018] Further optimized solution. According to the mobile adaptive conductive roller assembly (3) described in claim 1, it is characterized in that: the detection assembly includes an infrared temperature measuring device (6), which is fixedly connected to the conductive roller support seat connecting plate (19) and is used for real-time detection of the rolling temperature of the metal sheet (4). Real-time temperature measurement can compare the temperature rise characteristics of different modes and screen the optimal solution.

[0019] Further optimization solution, a pulsed current assisted rolling method, characterized in that a pulsed current assisted rolling device with zone power supply of double-sided conductive rollers described in any one of claims 1-5 is applied, including the following steps: S1: According to the initial thickness of the metal sheet (4) and the target thickness of the metal sheet (4) to be rolled, adjust the nuts in the inlet and outlet conductive roller assemblies (3), indirectly adjust the spacing of the conductive rollers (20) in the inlet and outlet conductive roller assemblies (3), the inlet side spacing is consistent with the initial thickness of the metal sheet (4), and the outlet side spacing is consistent with the target thickness of the metal sheet (4), so that the conductive rollers (20) are in full contact with the metal sheet (4); S2: Confirm the spacing between the conductive rollers (20) according to the thickness of the metal sheet (4) to be processed and confirm the elastic force of the corresponding spring (18); S3: According to the length of the metal sheet (4), select an appropriate front and rear spacing of the conductive roller assembly (3) and control the energization duration; S4: According to the test requirements, adjust the power-on circuit switch part (5) to select the circuit application method and perform pulsed current assisted rolling; S5: Supply power to the power-on circuit switch part (5) through the pulsed power supply (1) and apply pulsed current to the conductive roller assembly (3) and the metal sheet (4) to be processed.

[0020] Test example: Experimental materials: AZ31B metal sheet with a length of 200 mm, a width of 30 mm, and a thickness of 1.5 mm; Experimental parameters: Current density 25 A / mm 2 , current frequency 500 Hz, duty cycle 50%; Test method: As Figure 1 shown, feed the metal sheet from the inlet side, turn on the pulsed power supply, pass through the pulsed current assisted rolling device with zone power supply of double-sided conductive rollers, and complete plastic deformation through the rollers to obtain the pulsed current assisted rolled metal sheet.

[0021] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A pulse current assisted rolling device with zoned power supply for a double-sided conductive roller, characterized in that: The invention comprises a pulse power supply (1), a frame (2), a movable adaptive conductive roller assembly (3) and a detection assembly (6); the frame (2) is fixedly connected to a group of movable adaptive conductive roller assemblies (3) at the front and rear ends, and the movable adaptive conductive roller assemblies (3) at the front and rear ends have the same structure; the movable adaptive conductive roller assembly comprises: the conductive roller (20) forms rolling electrical contact with the metal plate (4), and the two ends of the conductive roller (20) are respectively fixedly connected to the rotor (21) of the conductive slip ring (22); the intermediate cavity part between the rotor end (21) and the stator end (23) of the conductive slip ring (22) is fixedly connected to the conductive roller support seat (25); the limit rod (9) passes through the conductive roller support seat connecting plate (19), the spring (18), and the spring support connecting plate (17) in sequence in the vertical direction, and is locked by a nut, wherein the conductive roller support seat (25) can slide up and down along the limit rod (9) and is elastically supported by the spring (18).

2. The mobile adaptive conductive roller assembly (3) according to claim 1, wherein: The rear support plate (15) and the front support plate (7) of the mobile adaptive conductive roller assembly (3) are fixedly connected via front and rear support connecting plates (14); a lead screw (13) and an optical axis (10) are arranged on the rear support plate (15); a lead screw nut (8) and a linear bearing (16) are arranged on the top of the spring support connecting plate (18); the spring support connecting plate (17) is threadedly connected to the lead screw (13) via the lead screw nut (8) and is slidably connected to the optical axis (10) via the linear bearing (16); and a servo motor (12) is transmission-connected to the lead screw (13) via a coupling (11), and is used to rotate the lead screw (13) and drive the spring support connecting plate (17) to move along the lead screw (13).

3. The mobile adaptive conductive roller assembly (3) according to claim 1, characterized in that: The conductive rollers (20) at the upper and lower ends of the mobile adaptive conductive roller assembly (3) are connected to the wire (23) of the power circuit switch part (5) through the stator end (23) of the conductive slip ring (22); the power circuit switch (5) of the mobile adaptive conductive roller assembly (3) on the inlet side of the frame (2) is connected to the positive electrode of the pulse power supply (1), and the power circuit switch (5) of the mobile adaptive conductive roller assembly (3) on the outlet side of the frame (2) is connected to the negative electrode of the pulse power supply (1), so that the internal current of the metal plate (4) flows from the rolling mill inlet direction to the rolling mill outlet direction, forming a complete power circuit.

4. The mobile adaptive conductive roller assembly (3) according to claim 3, characterized in that: The energized circuit switch part (5) can select a circuit application method, (a) the positive electrode and the negative electrode are both in contact with the upper surface of the metal plate (4); (b) the positive electrode and the negative electrode are both in contact with the lower surface of the metal plate (4); (c) the positive electrode is in contact with the upper surface of the metal plate (4), and the negative electrode is in contact with the lower surface of the metal plate (4). Different circuit application methods can be achieved by selecting different conductive roller contact methods, and then the effects of different circuit application methods on the metal plate can be explored.

5. The mobile adaptive conductive roller assembly (3) according to claim 1, wherein: The detection component comprises an infrared temperature measuring device (6), which is arranged to be fixedly connected to the infrared temperature measuring device (6) and the conductive roller support seat connecting plate (19), and is used to detect the rolling temperature of the metal plate (4) in real time. The real-time temperature measurement can compare the temperature rise characteristics of different modes and select the optimal solution.

6. A pulse current assisted rolling method, characterized in that, Applying the pulsed current assisted rolling device with zoned power supply for the double-sided conductive roller according to any one of claims 1-5, comprising the following steps: S1: According to the initial thickness of the metal sheet (4) and the target thickness of the metal sheet (4) to be rolled, adjust the nuts in the inlet and outlet conductive roller assemblies (3), indirectly adjust the spacing of the conductive rollers (20) in the inlet and outlet conductive roller assemblies (3), the inlet side spacing is consistent with the initial thickness of the metal sheet (4), and the outlet side spacing is consistent with the target thickness of the metal sheet (4), so that the conductive rollers (20) are in full contact with the metal sheet (4); S2: Confirm the spacing between the conductive rollers (20) according to the thickness of the metal sheet (4) to be processed and confirm the elastic force of the corresponding springs (18); S3: According to the length of the metal sheet (4), select an appropriate front and rear spacing of the conductive roller assembly (3) and control the power-on duration; S4: According to the test requirements, adjust the power-on circuit switch part (5) to select the circuit application method and perform pulsed current assisted rolling; S5: Supply power to the power-on circuit switch part (5) through the pulsed power supply (1) and apply pulsed current to the conductive roller assembly (3) and the metal sheet (4) to be processed.

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