Ultrasonic-assisted longitudinal-torsional composite vibration two-roller rolling device

Abstract

The invention relates to an ultrasonic-assisted longitudinal-torsional compound vibration two-roller rolling device, and belongs to the technical field of ultra-thin strip rolling. According to the device, the ultrasonic longitudinal-torsional vibration device is combined with the rolling mill, so that the deformation resistance of materials is effectively reduced, the surface roughness is improved, grains are refined, and the residual stress is reduced by utilizing ultrasonic vibration. The device comprises a rolling mill rack, an ultrasonic longitudinal-torsional vibration device, a winding device, a winding assisting device and an unwinding device. The ultrasonic longitudinal-torsional vibration device is composed of a variable-amplitude roller shaft, a connecting shaft, piezoelectric ceramics, a copper electrode, a rear cover plate and a hexagon socket screw, and has a single-excitation form and a double-excitation form. The single excitation device adopts a quarter-wavelength conical amplitude-change pole, a spiral groove is formed in the conical surface of the quarter-wavelength conical amplitude-change pole, and longitudinal vibration can be partially converted into torsional vibration; according to the double-excitation device, the torsional vibration amplitude is increased through cooperation of two longitudinal-torsional amplitude-change poles which are symmetrically arranged. The device is compact in structure, small in energy loss, high in machining precision and suitable for production of high-precision ultra-thin strips.

Description

Technical Field

[0001] The present invention relates to the technical field of extremely thin strip rolling, and particularly relates to a two-roll rolling device with ultrasonic-assisted longitudinal-torsional composite vibration. Background Art

[0002] High-precision extremely thin strip materials are widely used in fields such as aerospace, military nuclear power, high-end electronics, automobiles, household appliances, medical treatment, petrochemicals, etc. Thin strips with a thickness of 0.05 - 0.1 mm can be used for the elastic pieces of electronic component buttons; thin strips with a thickness of 0.1 - 0.6 mm are widely used for products such as polished mirror surfaces; thin strips with a thickness of 0.02 - 0.2 mm are widely used for metal diaphragm materials; thin strips with a thickness of 0.02 - 0.5 mm are used for USB interface materials; thin strips with a thickness of 0.12 mm can be used for diamond blades; thin strips with a thickness of 0.2 mm can be used for the base material of medical needles. These cutting-edge fields have put forward higher requirements for the properties of the required materials, such as strength, surface roughness, geometric accuracy, fatigue resistance, etc.

[0003] At present, high-precision extremely thin strip materials still face many problems during the production process, such as large and unevenly distributed residual stresses, high surface roughness and obvious textures, and relatively large average grain size. Traditional rolling control methods for precision thin strips are difficult to solve the above problems. Therefore, it is of great significance to explore a new rolling control process. Research shows that the "volume effect" and "surface effect" generated by the ultrasonic vibration energy field during the plastic forming process can change the microstructure of the material, thereby reducing the deformation resistance, effectively improving the work hardening phenomenon, and enhancing the plastic deformation ability of the metal. In addition, the high-frequency vibration generated by the ultrasonic vibration can promote the tangential deformation of the uneven bodies on the workpiece surface, reduce the obstacles to metal sliding, and reduce the surface roughness value. At the same time, applying ultrasonic vibration to the deformed metal can promote the migration and proliferation of dislocations inside the crystal, thereby realizing the refinement of grains.

[0004] In view of this, it is necessary to invent a two-roll rolling device with ultrasonic-assisted longitudinal-torsional vibration to solve problems such as large surface roughness, large residual stress, and large grain size that occur during the rolling of existing thin strips. Summary of the Invention

[0005] The purpose of the present invention is to provide a two-roll rolling device with ultrasonic-assisted longitudinal-torsional composite vibration, aiming to effectively solve the problems encountered in the traditional extremely thin strip rolling process by constructing an ultrasonic longitudinal-torsional composite vibration field for the roll-strip system.

[0006] To achieve the above purpose, the present invention provides the following solution: A two-roll rolling device with ultrasonic-assisted longitudinal-torsional composite vibration, comprising:

[0007] A rolling mill frame installed on the rolling mill body;

[0008] An ultrasonic longitudinal-torsional vibration device is installed inside the rolling mill housing and is used to connect an ultrasonic generating device and the roll shaft of the rolling mill. The ultrasonic longitudinal-torsional vibration device includes a horn roll shaft, a connecting shaft, piezoelectric ceramics, copper electrodes, a rear cover plate, and socket head cap screws. One end of the horn roll shaft is provided with a stepped shaft, and the other end is connected to a longitudinal-torsional horn. The longitudinal-torsional horn is a conical horn, and a spiral groove is formed on its conical surface. The length of the spiral groove is the same as that of the conical surface, and the spiral direction is the same as the rotation direction of the horn roll shaft.

[0009] The coiling device, the coiling assisting device, and the uncoiling device are arranged on both sides of the rolling mill and are used to provide the strip to be rolled, guide the transmission of the strip, and wind the rolled strip into a coil.

[0010] Further, the connecting shaft is a stepped shaft. One end of it is threadedly connected to the longitudinal-torsional horn, and the other end is coaxially assembled with alternately stacked piezoelectric ceramics and copper electrodes and is pre-tightened and fixed to the rear cover plate by socket head cap screws.

[0011] Further, the number of piezoelectric ceramics is an even number. The longitudinal polarization directions of two adjacent piezoelectric ceramics are opposite, and they are bonded by an adhesive to form a piezoelectric ceramic stack.

[0012] Further, the ultrasonic longitudinal-torsional vibration device is a single-excitation ultrasonic longitudinal-torsional vibration device or a double-excitation ultrasonic longitudinal-torsional vibration device.

[0013] Further, the single-excitation ultrasonic longitudinal-torsional vibration device includes a single horn roll shaft. One end of the single horn roll shaft is designed as a stepped shaft, and the other end is a longitudinal-torsional horn. The longitudinal-torsional horn is a quarter-wavelength horn, and its input end area is larger than the output end area to achieve energy concentration.

[0014] Further, the double-excitation ultrasonic longitudinal-torsional vibration device includes a double horn roll shaft. The double horn roll shaft includes two symmetrically arranged longitudinal-torsional horns, and the spiral directions of the spiral grooves on the two horns are opposite to synergistically increase the torsional vibration amplitude.

[0015] Further, the height h, width b, and spiral angle θ of the spiral groove, as well as the conical surface radii R and r, are adjusted according to production requirements to achieve different longitudinal-torsional vibration amplitudes.

[0016] Further, the spiral angle of the spiral groove is 45°, and four spiral grooves are evenly formed along the conical surface.

[0017] Further, a pressing device is installed above the rolling mill housing, and a supporting mechanism is installed on the side.

[0018] Further, the two-high rolling mill device with ultrasonic-assisted longitudinal-torsional compound vibration further includes a controller and an electrical cabinet provided on the rolling mill body. The controller is used for tension control and parameter adjustment, and the electrical cabinet provides power supply.

[0019] The present invention has the following beneficial effects:

[0020] The present invention provides a two-roll rolling device with ultrasonic-assisted longitudinal and torsional composite vibration. By combining an ultrasonic generating device with a rolling mill, high-precision ultra-thin strip longitudinal and torsional composite vibration rolling is achieved. The "volume effect" and "surface effect" generated by the ultrasonic vibration energy field play important roles in the plastic forming process.

[0021] The "volume effect" can reduce the flow stress inside the material, lower the deformation resistance of the material, and improve the plastic deformation ability of the metal. At the same time, the acoustic softening effect in the "volume effect" can promote the deformation of surface micro-protrusions of the material, thereby improving the surface quality of the high-precision ultra-thin strip and improving the surface roughness.

[0022] The "surface effect" of the ultrasonic vibration energy field can cause the frictional force between the roll and the high-precision ultra-thin strip to change periodically, thereby reducing the sliding frictional force between the two. In addition, after severe plastic deformation occurs on the material surface by the ultrasonic vibration energy field, grain refinement can be achieved, offsetting or reducing the residual stress distribution. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the ultrasonic-assisted longitudinal and torsional composite vibration two-roll rolling device of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the single-excitation ultrasonic longitudinal and torsional vibration device in the device of the present invention;

[0026] Figure 3 It is an exploded schematic diagram of the single-excitation ultrasonic longitudinal and torsional vibration device in the device of the present invention;

[0027] Figure 4 It is an axial sectional view of the single-excitation ultrasonic longitudinal and torsional vibration device in the device of the present invention during assembly;

[0028] Figure 5 It is a schematic structural diagram of the double-excitation ultrasonic longitudinal and torsional vibration device in the device of the present invention;

[0029] Figure 6 It is an exploded schematic diagram of the double-excitation ultrasonic longitudinal and torsional vibration device in the device of the present invention;

[0030] Figure 7It is a structural diagram of the spiral groove of the conical horn in the device of the present invention;

[0031] Figure 8 It is a cross-sectional view of the spiral groove of the conical horn in the device of the present invention.

[0032] In the figure: 1. rolling mill body; 2. rolling mill frame; 201. shaft sleeve; 202. rolling bearing; 203. shaft ring; 204. bearing support; 205. bearing end cover; 3. ultrasonic longitudinal torsional vibration device; 31. single excitation ultrasonic longitudinal torsional vibration device; 32. double excitation ultrasonic longitudinal torsional vibration device; 301. single variable amplitude rolling roller shaft; 302. double variable amplitude rolling roller shaft; 303. connecting shaft; 304. piezoelectric ceramics; 305. copper electrode; 306. rear cover plate; 307. hexagon socket bolt; 311. keyway; 312. rolling roller; 313. longitudinal torsional amplitude changing rod; 314. threaded rod; 315. threaded hole; 4. pressing device; 5. supporting mechanism; 6. rolling mill driving mechanism; 7. universal coupling; 8. controller; 9. electrical cabinet; 11. winding device; 12. auxiliary winding device; 13. unwinding device. DETAILED DESCRIPTION

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

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figures 1 to 8As shown, the present invention provides a two-roll rolling device with ultrasonic-assisted longitudinal-torsional composite vibration, comprising a rolling mill, an ultrasonic generator, a rolling mill frame 2, an ultrasonic longitudinal-torsional vibration device 3, a rolling mill drive mechanism 6, a controller 8, and an electrical cabinet 9, as well as a winding device 11, a winding aid device 12, and an unwinding device 13 rotating on the rolling mill body 1. The ultrasonic longitudinal-torsional vibration device 3 is installed in the rolling mill frame 2, and the ultrasonic longitudinal-torsional vibration device 3 is used to connect the ultrasonic generator and the rolling mill roll shaft to realize the combination of the ultrasonic generator and the rolling mill. A pressing device 4 for coordinating and adjusting the ultrasonic longitudinal-torsional vibration device 3 is installed above the rolling mill frame 2, and a supporting mechanism 5 is installed on the side, wherein the pressing device 4 is arranged above the rolling mill to control the size of the rolling pressing force, and by adjusting the contact pressure between the roller 312 and the rolled material, it is ensured that the force applied during the rolling process can meet the rolling requirements of the ultra-thin strip. The main function of the supporting mechanism 5 is to provide stable mechanical support for the roller 312 system. During the rolling process, the roller 312 needs to withstand a large rolling force and vibration load. The support device can ensure that the roller 312 maintains the correct position and posture during operation to avoid deformation or damage caused by uneven force or vibration. Because ultra-thin strips have extremely high requirements for thickness uniformity and surface quality, the support device can effectively reduce the radial and axial runout of the roller 312, thereby improving the rolling accuracy.

[0036] In the above embodiment, the rolling mill is the physical platform of the entire rolling process, which carries and fixes the roller 312 system and provides the necessary mechanical support and structural framework for the rolling process. The design of the rolling mill needs to have sufficient rigidity to withstand the high pressure and high-frequency vibration generated during the rolling process. It should be understood that the rolling mill is equipped with a variety of adjustment devices (such as the pressing device 4 and the support mechanism 5 of this embodiment) for accurately controlling the parameters such as the gap between the rollers 312, the rolling force, and the rolling speed to meet the requirements of different rolling processes. These adjustment functions are crucial for the production of high-quality ultra-thin strips.

[0037] In the above embodiment, the main function of the rolling mill drive mechanism 6 is to provide power for the rolling mill and drive the roller 312 to rotate. The rolling mill drive mechanism 6 transmits the torque of the motor to the roller shaft through the universal coupling 7. The rolling mill drive mechanism 6 is usually composed of a motor, a reducer and a transmission system, and can transmit the rotational motion of the motor to the roller 312. The rolling mill drive mechanism 6 in this embodiment can adopt a conventional drive device of the prior art, which usually includes an efficient motor and a transmission system. In the ultrasonic longitudinal torsional composite vibration rolling process, the drive mechanism needs to ensure the stable transmission of torque and be compatible with the vibration characteristics of the ultrasonic generator.

[0038] In the above embodiments, the controller 8 serves as the control system of the entire device, responsible for coordinating the operation of each component, controlling the tension, adjusting parameters, and implementing fault monitoring and alarm to ensure the automation and intelligence of the rolling process. One of its main functions is to control the tension of the coiling device 11 and the uncoiling device 13, and at the same time coordinate the operation of the entire rolling system; the electrical cabinet 9 provides a stable power supply for the mill drive device, the ultrasonic generating device, the controller 8 and other auxiliary equipment, protects the equipment from power failures, and at the same time provides drive and control functions for the motor and the ultrasonic generating device to ensure the normal operation of the system. The controller 8 and the electrical cabinet 9 can adopt mature means of the existing technology and will not be elaborated here.

[0039] In the above embodiments, the coiling device 11, the coiling assisting device 12 and the uncoiling device 13 are arranged on both sides of the rolling mill, and the rolling centers of the three are required to be on a horizontal center line. The coiling device 11 is the end point of the rolling process, and its main function is to rewind the rolled strip into a coil for subsequent processing or storage. The coiling assisting device 12 applies a certain pressure or tension to the strip, guides the strip to be accurately transmitted, avoids deviation or jamming, and ensures the smooth progress of the rolling process. The uncoiling device 13 smoothly unwinds the strip to be rolled from the coil and provides continuous raw material input for the rolling process.

[0040] The ultrasonic longitudinal-torsional vibration device 3 can adopt a single-excitation ultrasonic longitudinal-torsional vibration device 31 or a double-excitation ultrasonic longitudinal-torsional vibration device 32.

[0041] In a specific embodiment, the ultrasonic longitudinal-torsional vibration device 3 adopts a single-excitation ultrasonic longitudinal-torsional vibration device 31, as Figure 2 and Figure 3 shown, the single-excitation ultrasonic longitudinal-torsional vibration device 31 includes a single-amplitude roller shaft 301, a connecting shaft 303, a piezoelectric ceramic 304, a copper electrode 305, a rear cover plate 306 and an inner hexagon bolt 307.

[0042] One end of the single-amplitude roller shaft 301 is designed as a stepped shaft. On the stepped shaft, there are a shaft sleeve 201, a rolling bearing 202, a shaft collar 203, a bearing support 204 and a bearing end cover 205. The parts on the stepped shaft adopt coaxial fitting. The position where the rolling bearing 202 is installed is the same as that of the following connecting shaft 303 and is designed as a node. The vibration at this place is zero and it plays a role in supporting stiffness. A keyway 311 is opened at the end of the stepped shaft and is connected to the universal coupling 7 through a key. On the other side of the stepped shaft, there is a roller 312. The roller 312 is cylindrical, and its main function is to cause continuous plastic deformation of the high-precision ultra-thin strip.

[0043] The other end of the single-amplitude roll shaft 301 is a longitudinal-torsional amplitude transformer 313, which is a conical amplitude transformer with a conical shape. A spiral groove is provided on the conical surface, and the length of the spiral groove is the same as that of the conical surface. The spiral direction is designed to be the same as the rotation direction of the amplitude-changing roll shaft. A threaded rod 314 is designed at the large end of the conical surface. The connecting shaft 303 is designed as a stepped shaft throughout. The installation of the parts on the shaft is the same as that of the stepped shaft at one end of the amplitude-changing roll shaft, and coaxial assembly is required. An end face for bolt pre-tightening is milled on the shaft body. The shoulder position for installing the rolling bearing 202 is still designed as a node. The threaded hole 315 at one end of the connecting shaft 303 is in threaded fit with the threaded rod 314 at the large end of the conical surface of the longitudinal-torsional amplitude transformer 313. The threaded hole 315 at the other end is in coaxial fit with a plurality of piezoelectric ceramics 304 and a plurality of copper electrodes 305. It is required that one piezoelectric ceramic 304 and one copper electrode 305 are assembled concentrically in an alternating manner. The longitudinal polarization directions of two adjacent piezoelectric ceramics 304 are opposite. And after the piezoelectric ceramics 304 are purified, they are bonded with a special adhesive and aged. Further, the rear cover plate 306 is assembled concentrically with the former. Finally, the connecting shaft 303, piezoelectric ceramics 304, copper electrodes 305, and rear cover plate 306 are connected by hexagon socket head cap screws 307. During assembly, it is necessary to ensure that the piezoelectric ceramics 304, copper electrodes 305, and connecting shaft 303 are closely fitted together.

[0044] Amplitude transformers are divided into two categories according to their functions: half-wavelength amplitude transformers and quarter-wavelength amplitude transformers. Compared with half-wavelength amplitude transformers, quarter-wavelength amplitude transformers have a compact structure, small volume, light weight, and high energy conversion efficiency. The present invention adopts a quarter-wavelength amplitude transformer. The common shapes of amplitude transformers are five shapes: stepped, conical, exponential, catenary, and Fourier. The present invention adopts a conical amplitude transformer with a conical shape. A threaded rod 314 is designed at the large end of the conical surface, which can achieve threaded fit with the connecting shaft 303, and the area of the ultrasonic input end (the large end of the conical surface) is larger than the area of the output end (the small end of the cone). The purpose is that during the propagation of ultrasonic waves, the vibration energy will be concentrated on a smaller area, playing a role of energy concentration. A spiral groove is provided on the conical surface of the amplitude transformer, and its spiral direction is the same as the rotation direction of the single-amplitude roll shaft 301. During the rolling process, the ultrasonic longitudinal-torsional composite vibration can act on the precision ultra-thin strip more efficiently, reducing energy loss. The length of the spiral groove is the same as that of the conical surface. By converting a part of the longitudinal vibration generated by the radially polarized piezoelectric ceramic stack into torsional vibration, as Figure 7 and Figure 8 shown, a spiral groove structure is designed on the conical section. The geometric structure of the conical section consists of an externally grooved part and an internally solid part. The force on any cross-section is also composed of these two parts, that is, F = F A + F B , where F A and F B are affected by the groove depth h, h = R r, , it can be seen that as the slot height h increases, F B monotonically increases. The direction of the force F A on the cross-section of the internal solid part remains unchanged, while the force F B on the cross-section of the external grooved part changes along the groove direction and forms an angle θ with F. And F B can be further decomposed into a longitudinal component force F BL =F B cos(θ) and a tangential component force F BT =F B sin(θ). Therefore, the longitudinal force on the cross-section is F L =F A +F B cos(θ), and the tangential force is F T =F B sin(θ). The longitudinal force F L generates longitudinal vibration modes, while the transverse force F T generates torsional vibration modes. The torque on the cross-section is as follows:

[0045]

[0046] In summary, the finally transmitted torque of the ultrasonic horn is related to factors such as the height h, width b of the spiral groove, the spiral angle θ (the spiral angle of the present invention is 45°, and four spiral grooves are provided), and the cone radii R and r, etc.

[0047] In a specific embodiment, the connecting shaft 303 is designed as a stepped shaft throughout, with threaded holes 315 provided at both ends, which requires coaxial constraint. One end is in threaded fit with the single horn roll shaft 301, and the threaded hole 315 at the other end is in fit with the hexagon socket head bolt 307. A shaft end face for bolt preloading is milled on the shaft body, and a shaft shoulder is designed on the right side of the end face. In addition to playing a role in positioning the rolling bearing 202, this position is designed as a node, where the vibration displacement at the node position is always zero and remains stationary, reducing the influence of ultrasonic longitudinal-torsional vibration on the roll shaft and also enabling the generation of the maximum amplitude.

[0048] In a specific embodiment, the piezoelectric ceramic 304 is preferably a polarized power generation and receiving type piezoelectric ceramic material with high electromechanical conversion efficiency and relatively high mechanical quality factor. A through hole is drilled in the axial center of the piezoelectric ceramic 304, and the diameter of the through hole is the same as that of the threaded hole 315 at one end of the connecting shaft 303. The number is preferably an even number (six end-polarized piezoelectric ceramics 304 are selected in the embodiment of the present invention). The longitudinal polarization directions of two adjacent piezoelectric ceramics 304 are opposite. After purification, they are bonded with a special adhesive and subjected to an aging treatment. The thickness of the piezoelectric ceramic 304 is an important factor affecting the vibration effect. If the thickness is too thin, it is easy to generate vibration after being excited, and energy loss will occur during the ultrasonic propagation process; if the thickness is too thick, it is not easy to generate vibration after being excited. Therefore, it is very important to reasonably select the thickness of the piezoelectric ceramic 304.

[0049] In a specific embodiment, a through hole is drilled in the axial center of the copper electrode 305, and the diameter of the through hole is the same as that of the piezoelectric ceramic 304, which is used to combine with the piezoelectric ceramic 304. The number is the same as that of the piezoelectric ceramic 304. The piezoelectric ceramic element is excited by conducting high-frequency current to generate an electrostrictive effect. This effect causes the material to generate microscopic mechanical vibration, which is then amplified through mechanical resonance to form macroscopic ultrasonic vibration.

[0050] In a specific embodiment, the rear cover plate 306 is provided to prevent the energy generated by the piezoelectric ceramic crystal stack from radiating out through the hexagon socket head cap screw 307, resulting in a large amount of energy loss. At the same time, it is necessary to assist the piezoelectric ceramic 304 in heat dissipation. A through hole is drilled at the axial center position of the rear cover plate 306, and the diameter of the through hole is the same as that of the through holes of the piezoelectric ceramic 304 and the copper electrode 305. The three are closely fitted with the hexagon socket head cap screw 307 through the same axis.

[0051] In a specific embodiment, the hexagon socket head cap screw 307 clamps the piezoelectric ceramic 304 and the copper electrode 305 between the rear cover plate 306 and the connecting shaft 303 through pre-tightening, and at the same time applies a certain prestress to the piezoelectric ceramic 304. The purpose is to reduce the vibration tension and resonance frequency between the connecting shaft 303 and the piezoelectric ceramic 304, the copper electrode 305, and the rear cover plate 306, increase its mechanical strength, and prevent the piezoelectric ceramic 304 from fatigue cracking.

[0052] In another specific embodiment, the ultrasonic longitudinal-torsional vibration device 3 adopts a dual-excitation ultrasonic longitudinal-torsional vibration device 32, such as Figure 5 and Figure 6As shown in the figure, the dual-excitation ultrasonic longitudinal-torsional vibration device 32 includes a dual-amplitude roller shaft 302, two connecting shafts 303, multiple piezoelectric ceramics 304, multiple copper electrodes 305, two rear covers 306, and hexagon socket head cap screws 307. Except for the dual-amplitude roller shaft 302, the design and principle functions of other parts are the same as those of the aforementioned single-excitation ultrasonic longitudinal-torsional vibration device 31. The dual-amplitude roller shaft 302 is mainly composed of a roller 312 and a dual-amplitude rod. The design of the roller 312 is the same as the aforementioned one. The difference in the amplitude-changing part is that two longitudinal-torsional amplitude-changing rods 313 are symmetrically designed, and the spiral grooves of the two have opposite helix directions. The purpose of this is to keep the rotation direction of the ultrasonic longitudinal-torsional vibration of the dual-amplitude rods the same as that of the former during the process of the device rotating and working driven by the rolling mill drive mechanism 6, reduce energy loss, reduce the generation of heat, and improve processing efficiency.

[0053] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0054] The present invention proposes a processing composite process that combines the ultrasonic vibration energy field with precision ultra-thin strip rolling, which can solve the problems encountered in the traditional ultra-thin strip rolling process;

[0055] The ultrasonic longitudinal-torsional vibration rolling device designed by the present invention can generate torsional vibration along the direction of the spiral groove and vibration along the axial direction of the amplitude-changing rod, thereby realizing the longitudinal-torsional coupled ultrasonic vibration of the roller tool head. Compared with the single-longitudinal ultrasonic vibration design, this design is more integrated, has a compact structure, reduces the loss of ultrasonic energy during transmission, avoids the occurrence of heat generation, has high processing accuracy, and is reasonably designed;

[0056] The spiral groove structure designed in the conical amplitude-changing rod section of the present invention can be applicable to the longitudinal-torsional vibration amplitudes required in different productions by reasonably changing factors such as the height h, width b, and helix angle θ of the spiral groove, as well as the cone surface radii R and r;

[0057] The dual-excitation ultrasonic longitudinal-torsional vibration device designed by the present invention symmetrically sets two groups of longitudinal-torsional amplitude-changing rods with opposite helix directions of spiral grooves on both sides of the roller tool head. The two groups of amplitude-changing rods cooperate to output torsional vibration, which can significantly increase the torsional ultrasonic vibration amplitude in the circumferential direction of the roller.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0059] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A two-roll rolling device with ultrasonic assisted longitudinal-torsional composite vibration, characterized in that: include: A rolling mill frame (2) mounted on a rolling mill body (1); An ultrasonic longitudinal torsional vibration device (3) is installed in the rolling mill frame (2) and is used to connect the ultrasonic generating device and the rolling mill roll shaft; the ultrasonic longitudinal torsional vibration device (3) comprises a variable amplitude rolling mill roll shaft, a connecting shaft (303), a piezoelectric ceramic (304), a copper electrode (305), a rear cover plate (306) and a hexagon socket bolt (307); one end of the variable amplitude rolling mill roll shaft is provided with a stepped shaft, and the other end is connected to a longitudinal torsional amplitude changing rod (313); the longitudinal torsional amplitude changing rod (313) is a conical amplitude changing rod, and a spiral groove is provided on its conical surface; the length of the spiral groove is the same as the length of the conical surface, and the rotation direction is the same as the rotation direction of the variable amplitude rolling mill roll shaft; The winding device (11), the auxiliary winding device (12) and the unwinding device (13) are arranged on both sides of the rolling mill, and are used to provide the strip to be rolled, guide the strip transmission and wind the rolled strip into a coil.

2. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 1, characterized in that: The connecting shaft (303) is a stepped shaft, one end of which is threadedly connected to the longitudinal torsion amplitude transformer (313), and the other end of which is coaxially assembled with the alternately stacked piezoelectric ceramics (304) and copper electrodes (305), and is pre-tightened and fixed to the rear cover plate (306) via a hexagon socket bolt (307).

3. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 2, characterized in that: The piezoelectric ceramics (304) are an even number of pieces, the longitudinal polarization directions of two adjacent pieces of piezoelectric ceramics (304) are opposite, and the piezoelectric ceramic crystal stack is formed by bonding with an adhesive.

4. The ultrasonically assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 1, 2 or 3, characterized in that: The ultrasonic longitudinal torsional vibration device (3) is a single-excitation ultrasonic longitudinal torsional vibration device (31) or a double-excitation ultrasonic longitudinal torsional vibration device (32).

5. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 4, characterized in that: The single excitation ultrasonic longitudinal torsional vibration device (31) comprises a single variable amplitude rolling roller shaft (301), one end of the single variable amplitude rolling roller shaft (301) is designed as a stepped shaft, and the other end is a longitudinal torsional amplitude variable rod (313); the longitudinal torsional amplitude variable rod (313) is a quarter-wavelength amplitude variable rod, and the input end area is larger than the output end area to achieve energy aggregation.

6. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 4, characterized in that: The dual-excitation ultrasonic longitudinal-torsional vibration device (32) comprises a dual-amplitude rolling roller shaft (302), wherein the dual-amplitude rolling roller shaft (302) comprises two symmetrically arranged longitudinal-torsional amplitude variable rods (313), wherein the spiral grooves of the two amplitude variable rods have opposite rotation directions, so as to collaboratively increase the torsional vibration amplitude.

7. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 1, characterized in that: The height h, width b and helical angle θ of the spiral groove as well as the cone radii R and r are adjusted according to production requirements to achieve different longitudinal and torsional vibration amplitudes.

8. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 7, characterized in that: The helix angle of the spiral groove is 45°, and four spiral grooves are evenly arranged along the conical surface.

9. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 1, characterized in that: A pressing device (4) is installed above the rolling mill frame (2), and a supporting mechanism (5) is installed on the side.

10. The ultrasonic-assisted longitudinal-torsional composite vibration two-roll rolling device according to claim 1, characterized in that: It also includes a controller (8) and an electrical cabinet (9) arranged on the rolling mill body (1), wherein the controller (8) is used for tension control and parameter adjustment, and the electrical cabinet (9) provides power supply.

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