42 results about "Cyclic deformation" patented technology

The present invention relies on a band moiré image layout model capable of predicting the band moiré image layer layout produced when superposing a base band grating layer of a given layout and revealing line grating layer of a given layout. Both the base band grating layer and the revealing line grating layer may have a rectilinear or a curvilinear layout. The resulting band moiré image layout may also be rectilinear or curvilinear. Thanks to the band moiré image layout model, one can choose the layout of two layers selected from the set of base band grating layer, revealing line grating layer and band moiré image layer and obtain the layout of the third layer by computation, i.e. automatically. Base band grating layers and revealing line grating layers may be produced which yield, upon displacement of the revealing layer on top of the base layer or vice-versa, a band moiré image whose patterns move either along a predetermined direction or in the case of a concentric band moiré image, either inwards or outwards in respect to the center of the concentric moiré bands. In addition, it is possible to conceive a revealing line grating layer which when translated on top of the base band grating layer, generates a band moiré image which is subject to a periodic deformation. Furthermore, thanks also to the availability of a large number of geometric transformations and transformation variants (i.e. different values for the transformation constants), one may create documents having their own individualized document protection. A computing system may automatically generate upon request an individualized protected security document having specific base band grating and revealing line grating layouts. The computing system may then upon request generate and issue a security document incorporating the base band grating layer, a base band grating layer or a revealing line grating layer allowing to authenticate a previously issued security document. The presented methods may be used for creating an individualized protection for various categories of documents (banknotes, identity documents, checks, diploma, travel documents, tickets) and valuable products (optical disks, CDs, DVDs, CD-ROMs, packages for medical drugs, products with affixed labels, watches).

The invention discloses a method and device for tracking the contour of a motion object and a method and device for analyzing myocardial motion. The device for tracking the contour of the motion object is used for tracking the contour of the motion object doing periodic deformation movement in an image slice time sequence and comprises a contour tracking part, a contour comparing part and a contour correcting part, wherein the contour tracking part is used for tracking the contour in the first time direction with the initial contour of the motion object in preset image slice as a starting contour so as to obtain a first contour of the motion object in each image slice as well as tracking the contour in the second time direction so as to obtain a second contour of the motion object in each image slice; the contour comparing part is used for calculating the similarity of the first contour and the initial contour and the similarity of the second contour and the initial contour; and the contour correcting part is used for taking the contour in each image slice, which is obtained in the tracking direction of the contour corresponding to the greater similarity of two similarities as the contour of the motion object in the corresponding image slice.

The present invention relies on a band moiré image layout model capable of predicting the band moiré image layer layout produced when superposing a base band grating layer of a given layout and revealing line grating layer of a given layout. Both the base band grating layer and the revealing line grating layer may have a rectilinear or a curvilinear layout. The resulting band moiré image layout may also be rectilinear or curvilinear. Thanks to the band moiré image layout model, one can choose the layout of two layers selected from the set of base band grating layer, revealing line grating layer and band moiré image layer and obtain the layout of the third layer by computation, i.e. automatically. In the case of a concentric band moiré image, base band grating layer and revealing line grating layer layouts may be produced according to geometric transformations, which yield, upon relative displacement of the position sampled by the revealing layer on the base layer, a band moiré image whose patterns move either radially, circularly or according to a spiral trajectory, depending on the orientation of the base band replication vector in the original non-transformed base layer space. In addition, it is possible to conceive a revealing line grating layer which when translated on top of the base band grating layer, generates a band moiré image which is subject to a periodic deformation. Furthermore, thanks also to the availability of a large number of geometric transformations and transformation variants (i.e. different values for the transformation constants), one may create documents having their own individualized document protection. The base band layer and the revealing layer may be separated by a small gap and form a fixed composed layer, where, thanks to the well-known parallax effect, by tilting the composed layer in respect to an observer, different positions of the base layer are sampled and a dynamically moving moiré image is generated. A computing system may automatically generate upon request an individualized protected security document having specific base band grating and revealing line grating layouts. The computing system may then upon request generate and issue a security document incorporating the base band grating layer, a base band grating layer or a revealing line grating layer allowing to authenticate a previously issued security document. The presented methods may be used for creating an individualized protection for various categories of documents (banknotes, identity documents, checks, diploma, travel documents, tickets) and valuable products (optical disks, CDs, DVDs, CD-ROMs, packages for medical drugs, products with affixed labels, watches).

A self-propelled mechanical crawler adapted to move on a medium. One example of such a crawler includes a foot, a wave generator adapted to drive a periodic wave in the foot, and a wave transfer mechanism coupled between the wave generator and the foot. The wave transfer mechanism may be adapted to translate the periodic wave produced by the wave generator into a corresponding periodic deformation in the foot so as to generate forces in the medium to propel the crawler.

Small air pumping devices are mounted directly in the conventional tire valves to keep the vehicle's tires properly inflated without requiring the user's attention. If a tire is beginning to become under-inflated, a pumping piston having a single check valve is moved reciprocally in the tire valve stem by the cyclical deformation of the tire during the vehicle's travelling. The ambient air is pumped into the tires through the tire valves. The tire valves incorporating the pumping devices are kept using in a regular manner for reliably preventing air escaping from the tires and for inflating the tires from the external sources. Such “self-inflating” tire valves may be mounted as the regular tire valves both in new manufactured vehicles or in used vehicles without any modifications in the vehicle's axes, wheels or tires and without the necessity to make additional openings in the wheel.

The present invention relates to methods for preventing oxidation of polymeric material. The invention discloses solutions for lipid- and / or cyclic deformation-initiated oxidation, methods of making oxidation and wear resistant polymeric materials, methods of preventing such oxidation and materials used therewith also are provided.

The invention relates to an assembly type anti-seismic anti-freeze-thaw deformation self-adaptive corrugated plate rigid-flexible retaining wall. The retaining wall comprises a bottom plate and a retaining plate above the bottom plate, and the cross section of the retaining wall is in an inverted T shape; the bottom plate transversely comprises a plurality of rows of unit plates which are sequentially a front end bottom plate, a middle connecting bottom plate and a foundation bottom plate from inside to outside and are assembled and connected through inserting grooves and inserting strips in the end faces; the retaining plate comprises a plurality of stand columns and an arched steel corrugated retaining plate among the stand columns, strip-shaped grooves are formed in the two longitudinalside faces of each stand column, and the ends of the arched steel corrugated retaining plate are inserted into the strip-shaped grooves of the stand columns; and the longitudinal inserting grooves are formed in the surface of the foundation bottom plate, and the bottoms of the stand columns and the arched steel corrugated retaining plate are inserted into the inserting grooves of the foundation bottom plate. According to the retaining well, a prefabricated assembly type construction method is adopted, foundation deformation caused by huge horizontal seismic force and frost heaving force and vertical frost heaving force can be adapted, and the cyclic deformation adaptive capacity is achieved.

Provided is a shock stopper made of polyurethane foam for a suspension device, which can prevent the generation of unpleasant abnormal sound caused by friction against a spring seat when the stopper acts. In the impact stopper (46) made of foamed polyurethane that elastically abuts against the cylinder to limit the excessive contraction displacement of the shock absorber when jumping, the large-diameter fitting portion (60) at the upper end and the axial compression The portion between the deformable ring-shaped narrowing portion (48), and the insertion portion (80) in the state of being inserted into the concave fitting portion (44) of the spring seat (42) in the state of compression deformation when the vehicle jumps On the outer peripheral surface, a diameter reduction inducing portion (82) is provided, which has a substantially inverted tapered shape whose outer diameter gradually decreases toward the upper side, and induces a diameter reduction deformation accompanied by compression deformation, and at least at the insertion portion An annular gap for diameter-reducing deformation is formed between the inner peripheral surface (72) of the center hole (47) of (80) and the piston rod.

A self-propelled mechanical crawler adapted to move on a medium. One example of such a crawler includes a foot, a wave generator adapted to drive a periodic wave in the foot, and a wave transfer mechanism coupled between the wave generator and the foot. The wave transfer mechanism may be adapted to translate the periodic wave produced by the wave generator into a corresponding periodic deformation in the foot so as to generate forces in the medium to propel the crawler.

The invention discloses a shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device. The shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device comprises an MTS tester, an MTS controller, an optical measurement strain measuring device, a first temperature controller, a temperature sensor and a direct-current heating power supply, wherein the MTS controller is connected with the MTS tester; the optical measurement strain measuring device is connected with the MTS controller; the temperature controller is used for measuring the temperature of an MTS tester test sample; the first temperature controller is connected with the MTS controller; a positive electrode and a negative electrode of the direct-current heating power supply are connected with the two ends of the MTS tester test sample; a first relay is arranged between the direct-current heating power supply and the MTS tester test sample; the first relay is connected with the first temperature controller; a cooling module is further provided; the cooling module is connected with the first temperature controller; the first temperature controller is connected with the temperature sensor and the control device simultaneously; the MTS controller is connected with the control device. By adopting the shape-memory alloy thermal-mechanical coupled multiaxial cyclic deformation experimental device, the integrity of the test sample is effectively ensured, and required data can be acquired synchronously.

The invention provides a steel wire rope with high structural stability. The steel wire rope comprises a central steel wire and a plurality of winding steel wires distributed around the central steelwire; the diameter of the central steel wire is d, the central steel wire is periodically deformed by a deformation straightener in the weaving and twisting process, the deformation height of the central steel wire is h, and one deformation length is L2, wherein h is equal to 1-1.3d, and L2 is smaller than the twisting distance between the winding steel wires of the steel wire rope and the centralsteel wire during weaving and twisting; the distance between every two adjacent winding steel wires of the winding steel wires evenly distributed around the central steel wire is L1, wherein L1 is smaller than 0.1d. The invention further provides a preparation process of the steel wire rope with the high structural stability. The steel wire rope has the advantages that the glue permeation rate ofthe steel wire rope can be increased to a great degree; the resistance for the central steel wire to pierce a tire is increased, the structure of a framework material is more stable, the safety of the tire is improved, and the service life of the tire is prolonged.

The invention discloses a completely new concept screw propeller. The device is provided with a plurality of blades; and the blades are connected with an engine transmission shaft through a connecting rod. The screw propeller is characterized in that: a revolving trail of the blades is in the shape of a three-dimensional cylinder, but the revolving trail of the blades of the conventional screw propeller is in the shape of a circular platform; the cylinder formed by the revolving trail of the screw propeller is parallel to an engine power output shaft connected with the connecting rod, but the circular plane formed by the revolving trail of the blades of the conventional screw propeller is perpendicular to the engine power output shaft; the blades of the screw propeller periodically deform when doing work, but the blades of the conventional screw propeller do not deform generally when doing work; and the screw propeller can be used for driving an airplane, a ship, a vehicle or other devices moving with hydrodynamic force. The revolving mode of the screw propeller differs in fundamental significance from the conventional screw propeller; and the screw propeller has the superior functions which are not owned by the conventional screw propeller.

The invention relates to a platinum-rhodium alloy bushing plate base plate material and a preparation method for the bushing plate base plate material. The problems that a platinum-rhodium alloy bushing plate base plate is low in creep resistance, liable to cyclic deformation, short in service life, low in single plate yield and the like are solved. The platinum-rhodium alloy bushing plate base plate material comprises, by weight, 5-20parts of rhodium, 0.1-0.4 part of zirconium, and the balance platinum. The preparation steps comprise (1) burdening, (2) smelting, (3) forging and pressing, (4) surface treatment, (5) internal oxidation, (6) compounding and (7) rolling forming. At the same temperature, initial deformation and the service life of the bushing plate base plate material prepared through the preparation method are prolonged obviously compared with common materials. A bushing plate base plate prepared from the bushing plate base plate material is high in strength, not liable to deformation, resistant to high temperature, resistant to creep deformation and resistant to corrosion. The product quality of a bushing plate and the productivity of a whole tank furnace are both improved.

A full front blowing type air conditioner is disclosed. The disclosed full front blowing type air conditioner includes a case of which a heat exchanger is disposed in an inner side; and a blower module disposed in rear of the heat exchanger in the case, and configured to discharge a pulse jet for blowing through a front face of the case. The blowing module changes air pressure of a cavity formed between at least one pair of piezoelectric diaphragms and discharges the pulse jet to a side of the heat exchanger according to periodic deformation of the pair of piezoelectric diaphragms to opposite phases to each other.

The invention discloses a preparation method of a flexible super-hydrophobic silica gel film. The preparation method comprises the following steps: annealing a pure aluminum sheet in a resistance furnace at a certain temperature for 3 hours, taking out the annealed pure aluminum sheet, air-cooling the annealed pure aluminum sheet to room temperature, and ultrasonically cleaning the annealed pure aluminum sheet with deionized water for 5 minutes; then putting a uniformly mixed Becker solution into a heating stirrer, putting the aluminum sheet into the Becker solution for a reaction for several minutes, taking out the aluminum sheet, cleaning the aluminum sheet with deionized water, and drying the aluminum sheet to obtain an aluminum template; and uniformly pouring a PDMS solution prepared in a step S2 on the aluminum template treated in the step S3, conducting curing at 60 DEG C for 4 hours, slightly lifting an edge by using a knife after the PDMS solution is completely cured, and slowly tearing off the cured PDMS solution to obtain the flexible super-hydrophobic film. A silica gel polymer has long-term stability in the application of a super-hydrophobic material, and still keeps excellent restorability after cyclic deformation due to the flexibility of the silica gel polymer, so the silica gel polymer has a wider application range compared with the prior art, and is not only limited to tensile deformation any more. The method is simple, easy to scale and suitable for different polymers.

The invention discloses a multi-core fiber microbend sensor. The sensor comprises a fixed pipe sleeve, a multi-core fiber, and a deformer, wherein the fixed pipe sleeve is made of a rigid material, the multi-core fiber is arranged in the middle of the fixed pipe sleeve, a clearance between the fixed pipe sleeve and the multi-core fiber is filled with a flexible material, the fixed pipe sleeve andthe deformer are connected through an elastomer structure, the deformer is made of the rigid material, and the deformer is provided with periodic deformation teeth. External pressure is transferred toa fiber microbend deformer through deformation of the deformer, so that the periodic deformation teeth in the fiber microbend deformer act on the multi-core fiber in the fixed pipe sleeve, then the multi-core fiber bends slightly, different fiber cores in the multi-core fiber have different curvature radiuses of microbending due to different spatial positions, therefore, different fiber cores aredifferent in microbending loss, external pressure and direction change can be learnt according to losses of optical signals in different fiber cores, and external pressure and direction can be sensedat the same time.

The invention provides an application of a cyclic hardening model based on a weld dislocation winding precipitation phase in welded joint fatigue life prediction, and the cyclic hardening model is as follows: in the formula, the method takes the weld dislocation winding precipitation phase as a basis, and takes flow stress caused by a non-uniform dislocation structure of the weld dislocation winding precipitation phase into consideration at the same time; the influence of back stress caused by dislocation winding precipitation phases in a welding seam and back stress generated by the blocking effect of a welding seam grain boundary on dislocation on the cyclic yield strength is achieved, a cyclic hardening model of a welding joint is established on the basis, and the model well explains the relation among the maximum stress, the cycle index and the plastic strain; and a microscopic mechanism during fatigue failure based on a weld dislocation winding precipitation phase is explained, and the cyclic deformation behavior of the welded joint can be evaluated more quickly and accurately, so that a better theoretical basis is provided for prediction of the fatigue life of the welded joint.

The invention discloses a composite deformation type high-strength sawing wire and a manufacturing method thereof. The sawing wire is of a structure that edge-folding deformation exists in a single plane and bending deformation exists in three-dimensional space. In the single plane, the sawing wire is bent into a wavy structure, and crest heights of a composite deformed wire are identical within the spatial range. The composite deformation type high-strength sawing wire and the manufacturing method thereof solve the problems existing in traditional multi-wire cutting. The sawing wire has a periodical deformation feature, multiple inner spatial structures are formed by the deformed wire in each period, and then more mortar can be brought in when the sawing wire is used; meanwhile, auxiliary blades formed by edge-folding and bending deformation can play a role in chip removal, and the sawing wire is especially good at cutting hard and brittle materials such as solar silicon wafers, quartz, silicon ingots, ceramics, sapphire, gallium arsenide and stone.

The invention belongs to the technical field of chemical industry production, and provides a geotechnical composite adhesive, which comprises the following main components: petroleum asphalt, a SBS thermoplastic rubber, a SBS stabilizer, wollastonite powder, rubber powder and high-viscosity engine oil. The geotechnical composite glue has the following characteristics that: adhesion is strong, and material bonding is firm; texture is rich in elasticity, and impact strength and tensile strength are high, such that the adhesive can be used for sealing water resistance of the structure with high cyclic deformation; characteristics of excellent seepage resistance, excellent ductility, high bonding strength, good sealing performance, excellent impact resistance, excellent circumnutating resistance, excellent vibration resistance, excellent water resistance, excellent aging resistance and good special climatic resistance are provided, such that an application range is wide; use and operations are convenient, and a construction period is short; and characteristics of continuous stress distribution, light weight, good sealing effect, moderate process temperature, convenient heating and easy control are provided, and the adhesive is applicable for connection of complex members with different materials and different thicknesses in waterproof construction, and has strong promotion and application values.

The invention relates to an apparatus for producing a structured cross-channel packing element for a column for mass transfer and / or heat exchange between a heavy fluid phase and a light fluid phase wherein the structured cross-channel packing element comprises at least two adjacent layers made of expanded metal sheet, each layer comprising an opening, at least two of the at least two layers are arranged in parallel in a longitudinal direction of the filler element and are in contact with each other such that there is provided therebetween an open space extending from one end of the at least two layers to an opposite end, and wherein the opening is surrounded by a separating element and separated from each other, and comprising a periodic deformation in which at least two of the at least two layers are arranged in parallel in a longitudinal direction of the filler element and are in contact with each other. At least one of the heavy fluid phase and the light fluid phase can flow therethrough; wherein the apparatus comprises: a) a stretcher for cutting and stretching a metal sheet into an expanded metal sheet, b) optionally, a calibration machine for rolling the expanded metal sheet produced in the stretcher (a) to a desired thickness, c) a sheet storage unit, d) a forming machine for forming the expanded metal sheet, a forming machine for forming the expanded metal sheet produced in the stretcher and optionally rolled in the optional calibration machine into an expanded metal sheet comprising periodic deformations; and e) a stacker for stacking expanded metal sheets comprising a periodic deformation into a structured cross-channel filler element, wherein the sheet storage unit is implemented such that it directly receives the expanded metal sheet produced in the stretcher and optionally rolled in the optional calibration machine and directly releases the expanded metal sheet to the forming machine.

The invention relates to a thermoplastic polyurethane material that has high flex modulus, low density, and is capable of withstanding repeated cyclic deformation. The thermoplastic polyurethane composition is formed from the reaction product of a polyol component, which includes a blend of a polyether polyol, such as poly(tetramethylene ether glycol), and polybutadiene diol, a diisocyanate component, and a chain extender component.

The invention provides a manufacturing method of a nickel-titanium alloy component, and the nickel-titanium alloy component. The manufacturing method comprises the following steps: 1) nickel-titanium alloy powder is pre-arranged to form a to-be-treated layer, and in the nickel-titanium alloy powder, the atomic percent of Ni element is 49.8%-50.8%, and the balance is Ti atoms; 2) laser melting treatment is carried out on the to-be-treated layer according to printing process parameters to form a target layer; 3) the step 1) to the step 2) are repeatedly executed, and the nickel-titanium alloy component is formed; in the laser melting treatment, the laser power ranges from 90 W to 150 W, and the laser scanning speed ranges from 400 mm / s to 1200 mm / s; and the nickel-titanium alloy component is of a porous structure. The method is simple and easy to operate, the raw materials and the manufacturing parameters of the nickel-titanium alloy component are limited, the prepared nickel-titanium alloy component can show high shape recovery after large deformation greater than or equal to 50%, and a high shape recovery rate can still be kept after multiple times of cyclic deformation.

A radio transmitter is disclosed. Advantages of the invention: The shell moves up and down when it vibrates, shock absorber absorbs energy by cyclic deformation reset, the skateboard slides up and down in the chute, the shock absorbing is carried out, the collision intensity is reduced when violent vibration occurs or the radio transmitter drops to the ground, and the energy consumption generatedby the collision is absorbed through the cyclic deformation reset of the shock absorber, the strength of the radio transmitter to withstand the collision is improved, the stability of the radio transmitter is improved, the breakdown occurring in the transportation process is reduced, and the product experience is improved.

The invention relates to an article made from a thermoplastic polyurethane composition having that has high flex modulus, low density, and is capable of withstanding repeated cyclic deformation. The thermoplastic polyurethane composition is formed from the reaction product of a polyol component, which includes a blend of a polyether polyol, such as poly(tetramethylene ether glycol), and polybutadiene diol, a diisocyanate component, and a chain extender component.

The invention discloses a manufacturing method and technology of an environment-friendly energy-saving circulating deformation multifunctional broom. High-strength ABS plastic is adopted to be processed into a support, and then other structural accessories are combined. And the product is humanized in design. And the joint can be adjusted by 180-degree rotation. And the product is more flexible. No dead corners are left in corner gaps, and cleanness is achieved. Waste can be turned into wealth, and waste woven bag drawn wires are utilized to a greater extent. The old clothes, the waste cloth and the like are torn into into strips. And the cost is greatly saved. And if a wear-resistant PET twisted wire brush is arranged, the functions are more powerful and changeable, the adaptive crowd is wider, the labor intensity is greatly reduced, and more time and cost are saved. And when one surface of the wear-resistant PET twisted wire brush is seriously worn, the brush can be rotated by 180 degrees for reuse, The service life can be doubled more than one time on the original basis, the support can be repeatedly used when not damaged, and the product is a great improvement in the aspect of hygienic products.

The invention provides an application of a cyclic hardening model based on weld dislocation entanglement in welded joint fatigue life prediction, and the cyclic hardening model is shown in the figure. Based on weld dislocation entanglement, Meanwhile, the influence of flow stress caused by weld dislocation entanglement and back stress generated by the hindering effect of a weld grain boundary on dislocation on the cyclic yield strength is considered, a cyclic hardening model of a welded joint is established on the basis, and the model well explains the relationship among the maximum stress, the cycle index and the plastic strain. A microscopic mechanism during fatigue failure based on weld dislocation entanglement is explained, so that the cyclic deformation behavior of the welded joint can be evaluated more quickly and accurately, and a better theoretical basis is provided for prediction of the fatigue life of the welded joint.

The invention relates to a finish machining system and a finish machining method for reducing the anisotropy of a metal material. The system comprises two-roll mills, a speed splitting machine, a driving device, a discharging device, rolled piece longitudinal position control devices and a rolled piece transverse feed control device, wherein a rolling-mill housing on one side of each two-roll millis provided with a rolled piece inlet; a rolling-mill housing on the other side of each two-roll mill is provided with a rolled piece outlet; the rolled piece longitudinal position control devices are respectively arranged on the outer sides of the rolling-mill housings; the rolled piece transverse feed control device is arranged on the outer side of the rolled piece longitudinal position controldevice corresponding to one side of the rolled piece outlet; the discharging device is arranged on the outer side of the rolled piece longitudinal position control device corresponding to one side ofthe rolled piece inlet; and the roll surface of an upper working roll and / or a lower working roll is provided with a rolled piece nipping structure. By use of the finish machining system and the finish machining method disclosed by the invention, rolled pieces can greatly deform in the width direction or can periodically deform in the length direction as required, so that the anisotropy of the metal material is reduced, and mechanical properties of the metal material in all direction are uniform.

The present invention provides a check valve. In the state where the vacuum display part is sunken, relatively less force is exerted to lift the edge of the main body part of the valve, so it has better airtight sealing ability than the existing ones. The vacuum state can be maintained for a longer period of time without deforming the ring shape. The check valve includes: a main body part of the valve, forming a through hole up and down, formed of elastic material, and has a concave part on the bottom surface, and the concave part provides a space higher than the edge; a vacuum display part, along the upper end of the through hole The inner wall surface of the through hole at the position separated below is integrally connected to the valve main body, and is thinner than the thickness of the valve main body, and protrudes upward, between the cover and the valve main body. When the space between reaches the negative pressure, it sinks toward the cover; and the fixing part, combined with the valve joint part, is used to fix the valve main body to the valve joint part.

The invention discloses a multidirectional rolling strong deformation process. The multidirectional rolling strong deformation process is used for carrying out multipass circulating multidirectional rolling on a plate, and specifically comprises the following steps that a feeding mechanism feeds the plate between a first pair of rollers along the feeding direction, so that the thickness of the plate is reduced, and the width size of the plate is increased; the plate continues feeding between a second pair of rollers in the feeding direction, a pair of side spinning wheels are oppositely arranged on the two sides of the second pair of rollers, the width and thickness of the plate are recovered to the initial size, and first-pass multi-direction rolling is completed; and then the first procedure of the first pass is repeated, finally, a fourth pair of rollers with the surfaces alternately provided with protrusions and grooves are used for rolling, and the rollers can enable the local area of the plate to be subjected to repeated thinning and thickening cyclic deformation in a rolling process. According to the multidirectional rolling strong deformation process, overall multi-directional cyclic deformation rolling and local cyclic deformation rolling are conducted on the plate, an excellent structure which is higher in grain refinement degree and uniform in distribution can be obtained, and the comprehensive performance of the plate is remarkably improved.