47results about How to "Guaranteed fatigue life" patented technology

The invention discloses a stabilizing device, a floating foundation and an offshore wind power generator. The stabilizing device comprises a U-shaped water chamber, wherein the U-shaped water chamber comprises a first hollow upright column, a second hollow upright column and a bottom buoyancy tank connected between the bottoms of the two upright columns, the first upright column and the second upright columns are communicated with the bottom buoyancy tank, and the top of the first upright column and the top of the second upright column are communicated through an air communication pipeline. The floating foundation is at least provided with a first upright column, a second upright column and a third upright column, and comprises at least one stabilizing device. The offshore wind power generator comprises the floating foundation, a mooring rope, a tower, vanes and a wind power generator set, wherein the mooring rope is connected with the outer edge of the floating foundation and is anchored to the seabed, the bottom end of the tower is arranged on the floating foundation, and the vanes and the wind power generator set are arranged on the top of the tower. By means of the stabilizing device, stabilizing of a floating fan can be simply and effectively achieved through a double-resonance principle.

The invention discloses a floating fan base with flare type tension legs, a marine wind-driven generator and a construction method. The floating fan base comprises a top supporting platform, a bottom supporting structure, at least three hollow stand columns and a ballast regulating system, wherein the top supporting platform is used for supporting a pylon, blades and a wind-driven generator set; the bottom supporting structure is connected with multiple tension legs; the top supporting platform is connected with the bottom supporting structure via the hollow stand columns, the hollow stand columns are arranged around the vertical center line of the floating fan base, and each stand column inclines outwards from a lower end to an upper end relative to the vertical center line of the floating fan base; the ballast regulating system is arranged in the stand columns and/or the bottom supporting structure. The marine wind-driven generator of the base with the structure has excellent movement performance, integral wet towing can be performed, and the floating fan base and the marine wind-driven generator are convenient to manufacture, assemble and mount.

The invention discloses a machining technology for a gear shaft. The machining technology is characterized by including the following technological processes of material preparing, forging, normalizing, rough machining and semi-finishing machining, thermal refining, carburizing treatment, finish machining tooth grinding and checking and storage. According to the machining technology for the gear shaft, cracks and abrasion can be reduced, and the fatigue life can be prolonged.

The invention designs low-cost high-temperature carburizing steel for a high-temperature carburizing environment with a temperature higher than 1000 DEG C. The low-cost high-temperature carburizing steel consists of the following chemical components in percentage by weight: 0.16-0.20% of C, less than or equal to 0.04% of Si, 0.75-0.90% of Mn, 1.15-1.25% of Cr, 0.20-0.30% of Mo, 0.040-0.050% of Al,0.0120-0.0180% of N, less than or equal to 0.025% of P, 0.015-0.025% of S, less than or equal to 0.0010% of O and the balance of Fe and inevitable impurities. An Al/N ratio is controlled to be 2.0-4.0, Si content is controlled to be relatively low, and a deoxidation process in steelmaking and a stopper rod curve control process in continuous casting are combined, so that large-scale production and continuous casting can be realized, extra process treatment does not need to perform before high-temperature carburizing, a steel structure before carburizing does not need to strictly control and the process is greatly simplified. Grade of a B-class rough system, fine system impurities and Ds impurities of high-temperature carburizing steel is lower than 0.5, carburizing can be simulated for 2-6 hours at a temperature of 1000-1030 DEG C and mixed crystal is avoided. The carburizing steel can be effectively guaranteed in fatigue life after being applied to parts such as a gear.

The invention discloses a long-service-life high-temperature-resistant textile motor bearing, and belongs to the technical field of high-precision special bearing manufacturing. The long-service-lifehigh-temperature-resistant textile motor bearing is improved in the four aspects of technical design, manufacturing process, bearing lubricating grease selection and bearing manufacturing material, the service life of the improved bearing can be obviously prolonged, and the improved bearing is wear-resistant and high-temperature-resistant. According to the long-service-life high-temperature-resistant textile motor bearing, the working clearance Gr of the bearing is scientifically designed; the mounting clearance and the change clearance of inner and outer rings caused by temperature change areconsidered; and the problems that when the maximum rolling body load of a bearing raceway bearing region is increased during working operation, friction torque and temperature rise are increased dueto clearance change caused by elastic deformation and the bearing adhesion or damage due to fatigue occur too early are mainly solved, so that the service life of the bearing is greatly prolonged.

The invention discloses steel for a front axle of a medium-sized truck and a production method of the steel. The steel comprises the following chemical components including, by weight, 0.39% to 0.43% of C, 0.20% to 0.37% of Si, 0.65% to 0.80% of Mn, 0.95% to 1.10% of Cr, 0.01% to 0.05% of Mo, 0.02% to 0.03% of Ni, 0.02% to 0.05% of Cu, less than or equal to 0.020% of P, 0.010% to 0.025% of S, 0.010% to 0.040% of Alt and the balance Fe and other inevitable impurities, so that the contents of Mo, Ni and Cu in the steel meet the condition that the sum of Mo, Ni and Cu is more than or equal to the sum of 0.013C, 0.033Mn and 0.034Cr and less than or equal to the sum of 0.018C, 0.026Mn and 0.065 Cr. According to the steel for the front axle of the medium-sized truck and the production method of the steel, the contents of Mo, Ni, Cu and other elements in the steel are accurately controlled, steel grains are refined, the impact toughness of the steel is improved, and the fatigue life of the automobile front axle is prolonged.

The invention discloses a heat treatment method of a steel rail welding joint, and belongs to the technical field of steel rail welding. The heat treatment method solves the technical problems of saddle-shaped abrasion and early fatigue fracture of the rail welding joint caused by low hardness of a welding area or abnormal microstructure of the joint in the service process of a steel rail; and themethod is the heat treatment method of a rail flash welding joint. According to the method, the rail welding joint is sequentially subjected to a first cooling stage, a second cooling stage and a third cooling stage, and the cooling speed and temperature of each stage are controlled, therefore, the percentage content of the metallographic structure of the steel rail welding joint is less than orequal to 1.0%, the saddle-shaped abrasion and early fatigue fracture of the the steel rail welding joint caused by the low hardness of the welding area or abnormal microstructure of the welding jointin the service process of the steel rail are improved, and the fatigue life of the steel rail welding joint reaches more than 2.8 million times.

The invention belongs to the field of automobile parts and particularly relates to an automobile composite board spring. The automobile composite board spring comprises a steel plate sprig piece located on the upper portion and at least one composite material spring piece located on the lower portion. The steel plate sprig piece and the composite material spring pieces are overlaid up and down and are connected into a whole through fasteners. According to the automobile composite board spring, the composite structure of the steel plate sprig piece and the composite material spring pieces is adopted, structure design is reasonable, the effect is significant, when the automobile composite board spring is installed on an automobile chassis and road jolts are transmitted to the spring through an axle, the high-strength composite material spring pieces absorb most vibration through elasticity of the composite material spring pieces, and good vibration reducing performance is achieved. The steel plate sprig piece mainly achieves the effects of connection with an automobile body and bearing of a small quantity of torsion and shear stress caused by steering and braking, and thus overall strength is ensured. Composite materials are light, so that the weight of the whole automobile board spring is reduced, and the effects of weight reducing, emission reducing and load increasing are very significant.

The invention provides a train axle combined laser reinforcement method. According to the invention, axle interference fit parts are subjected to laser reinforcement, and axle non-interference fit parts are also subjected to laser reinforcement. With the method provided by the invention, reinforcement lives of axle interference fit parts match those of axle non-interference fit parts, axle service life is long, and axle reliability is high.

The invention relates to a method for equivalently converting a fatigue load of a large welding structural part. Needed equivalent load information is determined according to the operating work condition of the large welding structural part and relevant standards; a stress concentration position and its stress state of the large welding structural part under the effect of a theoretical load are calculated; multiple loads needing to be equivalently converted are combined to form one load, the magnitude and direction of an equivalent load are preliminarily determined; the magnitude of the load needing conversion with respect to a resultant moment of a central point of the structural part is determined, and the acting position of the equivalent load is calculated; the stress state of an original stress concentration position of the structural part is calculated; the fatigue life of the determined same stress concentration positions in an equivalent fatigue life diagram is compared; if fatigue life error results of the stress concentration positions before and after equivalent conversion of the load meet the engineering requirements, the equivalent load of a structural part fatigue test is determined. It is ensured that on the premise that the fatigue life of the structural part is invariable, load number is decreased, a testing scheme is simplified, the testing cost is saved, anda testing period is shortened.

The invention provides a rotary speed-limiting floating jet tool. The rotary speed-limiting floating jet tool comprises an outer cylinder and a rotating shaft, wherein the rotating shaft is installed in the outer cylinder in a rotatable and axial reciprocating movement mode, a liquid passing channel is formed in the rotating shaft, the front end of the rotating shaft is provided with a spraying hole used for centrifugal spraying, the rear end of the rotating shaft communicates with the outer cylinder, the spraying hole communicates with the liquid passing channel, and a speed limiting structure is arranged between the outer cylinder and the rotating shaft; the rotating shaft is arranged to be driven by liquid conveyed into the liquid passing channel from the outer cylinder, so that rotation and axial reciprocating movement are achieved; the speed limiting structure is used for limiting the rotating speed of the rotating shaft, and the spraying hole is used for centrifugally spraying the liquid outwards. The rotary speed-limiting floating jet tool is used in cooperation with a coiled pipe, key jet treatment can be carried out on a certain specific area without the need for the coiled pipe to take up and down, and the fatigue life of the coiled pipe is effectively guaranteed.

The invention relates to a high-speed precise laser drilling platform and a control method thereof. The high-speed precise laser drilling platform comprises a macro XY motion platform, a micro XY motion platform and a working sucker, wherein the micro XY motion platform is arranged on the macro XY motion platform, the micro XY motion platform comprises a supporting base, a connecting frame, a micro-bearing platform, an X-axis flexible hinge piece and a Y-axis flexible hinge piece, the two ends of the X-axis flexible hinge piece are correspondingly fixed on the connecting frame and the supporting base, the two ends of the Y-axis flexible hinge piece are correspondingly fixed on the connecting frame and the micro-bearing platform, the micro-bearing platform is further provided with a micro X-axis encoder and a micro Y-axis encoder which are used for measuring the motion information of the micro-bearing platform in the X/Y direction respectively, and the working sucker is installed on the micro-bearing platform of the micro XY motion platform. According to the high-speed precise laser drilling platform and the control method thereof, high-speed interpolation is realized by means of elastic deformation of flexible hinges, and high-speed precise positioning among holes is realized.