99 results about "Axial Loadings" patented technology

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The present invention belongs to the technical field of material experiment, and discloses a sling tension-bending fatigue experiment device. The device includes a reaction frame, an axial force loading module, an anchoring module, a bending loading module, a clamping module and a protection module. Among them, the axial force loading module, the anchoring module and the protection module are arranged on the columns of the reaction frame, the bending loading module is arranged on the cross beam of the reaction frame, and the clamping module is anchored to the ground. The axial force loading module is used to apply axial load, the anchoring module is used to fix the specimen, the bending loading module is used to apply bending load for tension-bending, both the clamping module and the bending loading module can control the bending load received by the specimen, and the protection module is used to prevent injuries caused by specimen fracture; The present invention provides a fatigue experiment device capable of simultaneously performing axial tension and bending, and obtaining various fatigue performance indexes of steel strands or parallel steel wires through tension-bending fatigue experiments, which is applicable to sling tension-bending fatigue experiments.

The invention discloses a tensile test device and method based on a pressing-to-pulling mode, and relates to the technical field of tensile tests. A tensile test method of a test piece under high temperature and high stress is realized, and the problems of stress concentration, difficulty in test piece preparation and the like in the existing tensile test are solved. The device comprises an axial loading mechanism, a confining pressure heating mechanism, a data acquisition mechanism and a control module, and the axial loading mechanism is connected with two ends of a test piece and is used for applying an axial load to the test piece; the confining pressure heating mechanism surrounds the periphery of the test piece and is used for applying circumferential pressure to the test piece and heating the test piece; the data acquisition mechanism is used for acquiring tension, temperature and deformation of the test piece under load; the signal output end of the control module is connected with the signal input ends of the axial loading mechanism and the confining pressure heating mechanism, and the control module is used for controlling starting and stopping of the axial loading mechanism and the confining pressure heating mechanism; the signal input end of the control module is connected with the signal output end of the data acquisition mechanism and used for receiving data acquired by the data acquisition mechanism.

The application relates to the technical field of bearings, in particular to a double-inner-ring double-row angular contact ball bearing which comprises an outer ring, two inner rings are arranged on the inner side of the outer ring, a retainer is arranged between the inner rings and the outer ring, a plurality of rolling balls in annular array arrangement are slidably embedded on the surface of the retainer, the surface of the rolling balls is in contact with the inner wall of the outer ring and the outer surface of the inner rings, and a sealing ring is slidably embedded on the face of each of the two inner rings away from each other. In the using process, the bearing is convenient to assemble, the two retainers and the sealing ring form a relatively integrated structure, the structural strength is effectively improved, compared with a traditional double-row angular contact ball bearing, the axial bearing capacity of the bearing is remarkably improved, the load borne by a single rolling body and a raceway is reduced, the risk of fatigue failure is reduced, meanwhile, the design enhances the capacity of the bearing to simultaneously bear axial load and radial load, and solves the problem that the traditional double-row angular contact ball bearing is difficult to apply under complex working conditions.

The invention relates to a device and a method for measuring radial strain and micro-deformation of pyrolysis of oil-rich coal. The device comprises a pressure chamber, and a pressure chamber inner cylinder is arranged in an inner cavity of the pressure chamber; a gas confining pressure chamber is formed between the outer wall of the pressure chamber inner cylinder and the inner wall of the pressure chamber; the annular heating sleeve sleeves the outer side of the pressure chamber; the displacement measuring structures are arranged on one side of the annular heating sleeve, and each displacement measuring structure corresponds to one protruding structure and is connected with the corresponding protruding structure; the stress applying structure is arranged at the lower end of the other side of the annular heating sleeve and is communicated with the gas confining pressure chamber; the temperature sensor is communicated with the gas confining pressure chamber; and the axial load loading mechanism is positioned above the pressure chamber. The radial strain capacity of the coal rock can be conveniently measured under the conditions of high temperature and triaxial stress loading, meanwhile, the radial micro-deformation of the coal rock is monitored, and the problem that the radial deformation is difficult to measure in the stress loading process of the coal rock under the high temperature condition is solved.

The invention provides a device suitable for a spinning process grid reinforced cylindrical shell structure shaft bending shear loading test, and relates to the technical field of mechanical property test, and the device comprises a portal frame, an axial loading mechanism, a transverse loading mechanism, a first connecting mechanism, a test piece, and a second connecting mechanism; the upper portion and the lower portion of the test piece are fixedly connected with the first connecting mechanism and the second connecting mechanism respectively, the portal frame, the second connecting mechanism and the transverse loading mechanism are fixedly connected to the ground or a trench, the axial loading mechanism is installed on the portal frame, and the first connecting mechanism, the test piece and the second connecting mechanism are located under the axial loading mechanism. The axial loading mechanism is used for being in contact with the upper part of the first connecting mechanism to realize axial loading of the test piece; the transverse loading mechanism is used for making contact with the side face of the first connecting mechanism, and transverse loading of the test piece is achieved. The device can be universally used in a certain size range of a test piece, a transverse load and an axial load do not interfere with each other, and it is guaranteed that the axial bending shear load can be accurately loaded.

To avoid interference between a radial retainer and an axial retainer.SOLUTION: A motion guide device 1 comprises a radial retainer 40 that holds a plurality of first rolling elements 31 that receive a radial load among a plurality of rolling elements 30, and an axial retainer 50 that holds a plurality of second rolling elements 32 that receive an axial load, as retainers for holding the plurality of rolling elements 30 interposed between an inner ring 10 and an outer ring 20. A pair of bands 52, 53 of the axial retainer 50 are arranged on both radial sides of a plurality of partition walls 51 of the axial retainer 50, and of the pair of bands 52, 53, one band 53 that is arranged on the radial retainer 40 side has a smaller radial dimension than the other band 52 that is arranged on the opposite side of the radial retainer 40.SELECTED DRAWING: Figure 3

The invention relates to the technical field of wind power generation tests, and discloses a wind power tower load loading test device and an evaluation system.The wind power tower load loading test device comprises a test bed, a loading structure and a load actuation structure; by arranging the loading structure and the load actuating structure, vertical axial force, bending moment, horizontal shearing force and torque can be applied to a test piece at the same time, and the test device is closer to the actual stress working condition compared with a traditional loading mode, so that the accuracy and reliability of test data are improved; the first actuator is arranged perpendicular to the upper end face of the loading piece so as to simulate the axial load and bending moment effect borne by the wind power tower in the operation process. The second actuator is arranged perpendicular to the side face of the loading part so as to apply shearing force and torque, multi-dimensional combined loading is achieved, and mechanical property analysis of complex load combination is facilitated; the loading mode is controlled through the actuator, the controlled and accurate load applying process is achieved, manual intervention is reduced, and the test efficiency and consistency are improved.

The present invention belongs to the technical field of aviation speed reducer rotor shaft equipment, and specifically relates to a method for measuring the clearance of a speed reducer rotor shaft tapered bearing and a method for manufacturing the same. One method for measuring the clearance of a speed reducer rotor shaft tapered bearing includes a stop mechanism and an axial loading mechanism; the axial loading mechanism is used to apply an axial force to the rotor shaft of the speed reducer rotor shaft assembly from bottom to top, and the stop mechanism is arranged above the axial loading mechanism, and is used to guide the rotor shaft of the speed reducer rotor shaft assembly; the measuring method includes the following steps: the speed reducer rotor shaft assembly is arranged on the axial loading mechanism, and a micrometer is arranged on the speed reducer rotor shaft assembly; the axial loading mechanism applies an axial force F to the speed reducer rotor shaft; and the clearance value measured by the micrometer is obtained. The present invention applies an axial load to the rotor shaft by pushing from bottom to top, which effectively avoids unbalanced load and improves the accuracy of the tapered bearing clearance measurement.

This invention relates to the field of spacecraft attitude control technology, and more particularly to an ultra-precise and ultra-stable on-orbit adaptive control method and system for pointing under additional stiffness disturbances. This on-orbit adaptive control method, by applying specific excitations to actuators and measuring their responses, combined with a recursive filtering algorithm, can accurately identify the total actuator stiffness, including the additional stiffness of the cable, in real-time on-orbit, overcoming problems caused by differences in ground testing environments and time-varying stiffness. Based on the real-time identified stiffness values, the parameters of the axial compensation controller and the actuator compensation controller are dynamically adjusted, enabling the control system to adapt to changes in the additional stiffness of the cable and maintain excellent control performance at all times. By employing dual compensation control at the axial load level and the actuator level, additional stiffness disturbances are synergistically suppressed at both the overall system and local actuator levels, improving the comprehensiveness and accuracy of control, and achieving ultra-precise and ultra-stable on-orbit adaptive control for pointing under cable additional stiffness disturbances.

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The reversing loading device for reversing loading bearing test of aero-engine belongs to the field of aero-engine main shaft bearing test. It comprises a cylinder fixing seat, a left axial loading cylinder, a right axial loading cylinder, a limiting screw, a tested bearing seat, a tested bearing fixing nut and a tested bearing inner ring cover. The left and right sides of the cylinder fixing seat are respectively provided with the left axial loading cylinder and the right axial loading cylinder. The outer side wall of the tested bearing is installed in the cylinder fixing seat through the tested bearing seat of the cylinder fixing seat. The limiting screw is threadedly connected to the cylinder fixing seat, and the bottom of the limiting screw is tightly combined with the outer side wall of the tested bearing seat. The tested bearing inner ring is provided with the tested bearing inner ring cover. The purpose is to solve the problems of lacking of a loading device which can simulate the axial load size and direction and independently and continuously change according to the test load spectrum in the existing aero-engine main shaft bearing test. The device has the technical advantages of simple structure and ingenious design.

The invention discloses a cascade type loading system and method for a curved surface wallboard shear load test. The system comprises a fixed end assembly, a movable end assembly and a cascade system. The cascade system is formed by connecting a plurality of shearing force loading units in series in a hinged mode and is connected between the fixed end assembly and the movable end assembly. A reverse load is applied to a pair of torsion actuators of the movable end assembly to form a torque, the torque is transmitted through a cascade system, and a uniform shear load is generated in the longitudinal direction of a test piece. Through the modular and cascaded design, high-uniformity application of the shear load and effective decoupling of the axial load are achieved.

A loading device for testing a large-scale precision weak rigidity turntable includes a support frame, a support chassis, a test frame, a central shaft, a bearing, and a loading assembly; the support frame is a portal frame structure, the support chassis is fixed to a ground rail platform or the ground at the center of the support frame, the central shaft is vertically arranged at the center of the support chassis and the test frame, and the bearing is arranged on the outer edge of the upper end of the central shaft; the loading assembly includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope, and a counterweight block. The structure of the present invention is simple, safe and reliable, and has high test accuracy. The counterweight gravity is loaded onto the rotating platform through the pulley group, which is easy to operate and has a lower manufacturing cost than other loading methods; the test turntable drives the test frame to rotate around the central axis, and applies axial force, radial force, and overturning moment in the rotating state, which can simulate the stress state of the test turntable under actual working conditions and provide reliable test data support for actual users of the test turntable.

The present invention discloses a one-dimensional soil column freezing-seepage intelligent regulation system and a testing method under axial loading, specifically relating to the technical field of soil seepage. The system includes a one-dimensional soil column freezing apparatus, a freezing cycle device, an axial loading device, and a seepage device. The one-dimensional soil column freezing apparatus includes a soil column mold and a freezing chamber. The freezing chamber is connected to the freezing cycle device for unidirectionally freezing the soil body. The axial loading device is used to apply an axial load to the soil body. The seepage device includes a PID controller, a seepage liquid storage tank, a seepage inlet pipe, a seepage outlet pipe, a peristaltic pump, and a flowmeter. Both the seepage inlet pipe and the seepage outlet pipe are connected to the soil column mold. The peristaltic pump connected to the seepage inlet pipe and the flowmeter connected to the seepage outlet pipe are both connected to the PID controller. The PID controller can adjust the delivery flow rate of the peristaltic pump according to the signal output by the flowmeter. The present invention can maintain the stable seepage of the soil body in the freezing test and improve the accuracy and reliability of the test results.

The present invention comprises: an inner ring (2); an outer ring (3); a plurality of balls (4) disposed between the inner ring (2) and the outer ring (3); circumferential grooves (5) formed on an outer diameter surface of the outer ring (3); an insulating layer (6) having insulating properties and provided on the outer diameter surface of the outer ring (3) so as to be fitted into the circumferential groove (5); and a rotating shaft body (7) fitted into an inner diameter surface side of the inner ring (2). In an operating state of the bearing, the circumferential grooves (5) are formed so as not to overlap with either an extension of a composite load (F) toward the inner diameter side nor an extension of the composite load (F) toward the outer diameter side, the composite load (F) being a resultant force of a radial load (F1) and an axial load (F2) acting on the inner and outer rings (2, 3) from the balls (4).

The invention discloses a bearing rigidity indirect measurement method and system based on system error compensation, and the method comprises the following steps: installing a standard sample block in a test system, applying an axial load, measuring a first deformation amount of the standard sample block under each stage of load, and recording the first deformation amount as a system deformation amount; installing a measured bearing, applying axial loads of all levels which are the same as the axial loads of the step S1, measuring a second deformation amount of the measured bearing, and recording the second deformation amount as a total deformation amount; according to the obtained total deformation amount and the system deformation amount, calculating the real deformation amount of the measured bearing under each level of load; and determining a load-deformation function relationship based on a corresponding relationship between each stage of axial load and the real deformation amount, and obtaining the rigidity of the measured bearing. Compared with the prior art, the standard sample block is introduced for comparison testing, a system error compensation mechanism is innovatively provided, errors caused by self deformation of a testing system can be accurately eliminated, the real deformation amount of the bearing is obtained, the rigidity measurement precision is greatly improved, and the method is particularly suitable for accurate calibration of the high-rigidity bearing.

This invention relates to a C f The method for determining the cutting depth of SiC ceramic matrix composites first involves conducting nano-scraping tests to obtain the three-dimensional morphology, scratch depth, scratch force, and axial load variation curves of the nano-scratches along various directions with the scratch distance. Then, the scratch depth range corresponding to the microscopic brittle fracture domain is determined when scratching along a single direction. This process is repeated to obtain the scratch depth range corresponding to the microscopic brittle fracture domain along various directions. Finally, the depth of cut for SiC is determined. f When machining SiC ceramic matrix composites, the scratch direction is determined, and the corresponding scratch depth range corresponding to the microscopic brittle fracture domain is identified, which is then used as the cutting depth range. This invention controls the cutting depth within the scratch depth range corresponding to the microscopic brittle fracture domain, achieving material removal without causing excessive cutting forces, severe tool wear, or short tool life due to excessive cutting depth or the high hardness of the material.

An extrusion assembly for a micro puree machine, the extrusion assembly including a bowl having a sidewall defining an interior volume, a plunger engageable with a driven shaft configured to axially move the plunger within the interior volume of the bowl, and a plunger drive inhibitor configured to restrict axial movement of the plunger within the interior volume of the bowl when a predetermined limit of force is reached or exceeded, the plunger drive inhibitor including a sensor configured to translate an applied axial load on the plunger into an electrical signal, wherein, upon axial movement of the driven shaft, the sensor is configured to measure a current corresponding to a force experienced by the plunger.

The application provides a performance test device and method for a grouting connecting section of an offshore wind power jacket, and the device comprises: a clamping mechanism arranged in a sealed cabin; a rotating mechanism arranged in the sealed cabin, wherein the rotating mechanism is provided with a rotating end; at least two telescopic members are arranged on the rotating end of the rotating mechanism and are oppositely arranged on two sides of a test piece in a radial direction, and the telescopic members have movable ends which can move along the axis direction of the test piece; a transverse loading mechanism is arranged on the movable end of the telescopic member, and the transverse loading mechanism is provided with two transverse loading ends; and an axial loading mechanism is arranged on the sealed cabin, and the axial loading mechanism is provided with an axial loading end for applying an axial load to the test piece. The device can simulate various load working conditions of the connecting section in actual operation, and can adjust the height position and azimuth angle of the load applied to the test piece, thereby improving the test coverage range and efficiency, ensuring that the test data is accurate and reliable, and providing a powerful guarantee for safe and stable operation of offshore wind power facilities.

The present application relates to thrust bearing technical field, particularly to a kind of composite bearing equipment and its axial load supporting method, bearing equipment includes axial permanent magnetic levitation bearing device and magnetic medium lubrication thrust roller bearing device;Axial permanent magnetic levitation bearing device is used to generate repulsion type magnetic levitation force;Magnetic medium lubrication thrust roller bearing device includes upper thrust roller seat, lower thrust roller seat, magnetic conducting ring, magnetic lubricating medium and several rollers;Upper thrust roller seat and lower thrust roller seat are made of ferromagnetic material, and roller is fixed on lower thrust roller seat by magnetic force;Roller below is also provided with the permanent magnetic block or the roller positioning reverse permanent magnetic block that is arranged along circumference interval, separated by non-magnetic interval block;By forming circumferential magnetic circuit chain, magnetic lubricating medium is adsorbed on the surface of roller.By this bearing equipment and its axial load supporting method, static load can be supported, dynamic load can also be supported, and roller damage can be avoided.

The problems that an existing rolling bearing acceleration experiment device is tedious in adjustment, cannot achieve continuous adjustment and is low in experiment efficiency are solved. The invention provides a rolling bearing acceleration experiment device which comprises a rotating speed loading module, a first supporting and lubricating module, a radial load loading module, a second supporting and lubricating module, an axial load loading module, a main shaft and a console. The rotating speed loading module regulates and controls a servo motor through a console to realize continuous and accurate regulation of the rotating speed of the main shaft and can simulate complex working conditions. Wherein the radial load loading module adopts a structural design of a first hydraulic cylinder and a bearing disc, a piston rod is pushed by oil pressure in the first hydraulic cylinder to directly apply a load, and continuous and accurate adjustment of the radial load can be realized without disassembly; the bearing bearings in the bearing disc are in interference fit with the main shaft, and are axially positioned through the shaft rings on the main shaft, so that stable load transmission is ensured, a symmetrical simply supported beam stress structure is formed, radial force is uniformly distributed to the experiment bearings on the two sides, and the experiment efficiency is greatly improved.

The invention belongs to the technical field of fatigue tests, and discloses a composite swing torsion loading device and method.The composite swing torsion loading device is characterized in that one end of a composite test piece is connected with a first test piece clamping assembly, one end of the first test piece clamping assembly is connected with the composite test piece, and the other end of the first test piece clamping assembly is connected with a thrust bearing set; the first test piece clamping assembly can freely rotate in the X-axis direction relative to the thrust bearing set, and the thrust bearing set can transmit an axial load and a bending moment load; the other end of the composite material test piece is connected with a second test piece clamping assembly; the second test piece clamping assembly is directly fixed on the U-shaped frame; lug pieces at the two ends of the U-shaped frame are hinged to the two sides of the O-shaped ring along the Y axis through a first pin shaft and a second pin shaft respectively, and the U-shaped frame can rotate relative to the O-shaped ring along the first pin shaft and the second pin shaft. The problem of mutual coupling of four-dimensional loads including waving bending moment, shimmy bending moment, centrifugal force load and torsional load of the composite material is solved.

The utility model relates to the technical field of nuts, in particular to a light aluminum alloy self-locking nut. Comprising a nut body; a central cylindrical threaded hole is formed in the nut body in the axis direction, and internal threads are arranged on the edge of the threaded hole. The nut body comprises a wrenching part and a flange part; the end face of the wrenching part is provided with six faces, self-locking closing-up points are arranged on the six faces, and the self-locking closing-up points press three points to close up. The three-point self-locking closing-up points are arranged at the midpoints of three mutually disjoint edges on the six sides, and the three-point self-locking closing-up points are connected to form an equilateral triangle. According to the self-locking nut disclosed by the utility model, three points of closing-up are pressed on six sides of the wrenching part, so that the structure of the nut is more compact, the height and the weight of the self-locking nut are greatly reduced, and under the conditions of the same specification and the same material, the same self-locking performance and the same axial load capacity can be achieved, and more uniform and stable locking torque can be provided.

The utility model relates to the technical field of pile foundation engineering, and particularly discloses a physical model test device for testing the anti-pulling performance of a non-soil-squeezing precast pile foundation, which comprises a multifunctional cement grouting machine, a slurry storage pool, a vacuum pump, a water storage tank, a vacuum water pumping pipe, a model box bottom plate, a model box side plate and a high-strength toughened glass plate, and the output end of the multifunctional cement grouting machine is communicated with the outer surface of the slurry storage tank. According to the large-diameter non-soil-squeezing uplift pile construction device, an axial load is applied through an axial jack, loads of the upper portion and the lower portion of a model pile are collected through an upper pressure sensor and a lower tension sensor, pile body strain is collected through a pile body strain gauge, and a load displacement curve (Q-S curve) of a static load test of an uplift pile is obtained; the bearing capacity and the side friction resistance of the while-drilling pipe pile are obtained through calculation, the displacement of the uplift pile and the displacement of the soil layer can be obtained through the dial indicator and the laser displacement meter respectively, and therefore the contribution effects of different uplift measures on the uplift force are judged.

This invention discloses a method for calculating the critical preload margin of bolts under external loads. The method includes establishing a finite element model of an assembly connected by bolts and setting contact relationships and constraints; applying an external load to the finite element model and solving it to obtain the bolt working load; extracting the force values ​​in the x, y, and z directions at the contact position between the bolt head and the clamping element from the bolt working load; and calculating the shear load and axial load of the bolt working load using these force values; and calculating the critical preload margin required to ensure the clamping element does not separate using the shear load and axial load. This invention, through the contact settings used in finite element analysis, can obtain the actual working load borne by the bolt according to different external loads, and then evaluate the minimum bolt preload force required to prevent the clamping element from separating, i.e., the critical preload margin. This critical preload margin can then be used to guide bolt selection, safety assessment, and product optimization design.

The embodiment of the utility model provides a lawn mower screw anti-loosening structure, and relates to the technical field of lawn mowers. The mower screw anti-loosening structure comprises a screw body, a reinforcing mechanism is arranged on the outer surface of the screw body, an anti-loosening mechanism is arranged below the reinforcing mechanism, and a damping mechanism is installed on the anti-loosening mechanism. According to the embodiment, the fastening base and the screw body are tightly arranged in a sleeving mode, the fastening sleeve is combined, the stability of the structure in the vertical direction is enhanced, and large axial loads can be borne. And the mounting plate can be conveniently connected with other parts of the mower, so that integral integration is realized. The limiting plate limits horizontal displacement of the components, and relative position precision of all the components is guaranteed. The torque assembly is matched with the connecting block, the clasping piece and the non-slip mat, when the screw tends to loosen due to external force, reverse torque is generated to enable the clasping piece to clasp the screw, the non-slip mat increases friction force, and the screw is effectively prevented from rotating and loosening.

This invention belongs to the technical field of test devices for simulating rotor force loads, specifically relating to a test loading device that can eliminate the mutual interference between axial and radial force loads. This invention applies axial and radial loads separately to two sets of bearings, both of which are suspended structures. The radial loading bearings are roller bearings, whose structural characteristics allow them to transmit only radial loads, unaffected by axial loads; the axial loading bearings are angular contact ball bearings, and their suspended structure ensures they do not bear radial loads. The loads applied to the axial loading bearings are not canceled out, and the load application accuracy is unaffected, fully meeting the technical specifications for aerospace bearing performance evaluation tests.

The invention discloses a sleeve thread damage simulation test method and device based on multi-section volume fracturing parameters, firstly, two sleeve pup joints which are in threaded connection through a coupling are put into a test device, the end part of one sleeve pup joint is connected with an axial load mechanism, and the coupling is connected with a radial load mechanism; the radial load mechanism and the axial load mechanism are started respectively, the radial load mechanism acts on the coupling in the radial direction to force the connected casing pipe to be bent and eccentric, and the axial load mechanism acts on the end portion of the casing pipe in the axial direction to enable the casing pipe to be pressed in the axial direction; starting a vibrator on the short section of the casing pipe, stopping vibration, injecting internal pressure into the casing pipe, and observing the internal pressure condition of the casing pipe; starting the next vibration and internal pressure test; and finally, recording the vibration frequency and amplitude of the vibrator and the internal pressure of the sleeve when the thread sealing of the sleeve fails. According to the method, multi-section volume fracturing site construction parameters can be simulated, the early-stage sealing failure of the casing thread is analyzed and researched, and then site production is guided.

The application discloses a kind of for magnesium alloy staged adjustable friction spot welding method, when the plate to be welded is carried out friction stir welding, its welding process parameters are: 1) insertion stage;2) main stirring stage: rotational speed is according to k2=(ω (t) 2 ‑ ω (t) 1) / (t ‑ t1) Linearly decreases, the amount of depression is Δh2, axial load F (t) 2 Constant;3) residence stage: rotational speed is according to k3=(ω (t) 3 ‑ ω (t) 2) / (t ‑ t2) Linearly decreases, axial load linearly rises;4) shrinkage densification stage: rotational speed is according to k4=(ω (t) 4 ‑ ω (t) 3) / (t ‑ t 3 ) Linearly decreases, shrinkage speed is v r The application is by the parameter such as welding step, stirring head rotational speed, axial load and welding time in the welding process Stage coordination and regulation, simultaneously in combination limit the highest temperature of key temperature control area, make weld nugget zone occur orderly plastic flow and controlled dynamic recrystallization in different welding stage, to realize the stable regulation and control of weld nugget zone structure and interface bonding state.