63results about How to "Guaranteed fatigue strength" patented technology

The invention provides a steering frame contact sleeper beam and a railway vehicle. The steering frame contact sleeper beam comprises an upper cover plate, a supplement plate, a lower cover plate, an inner side vertical plate, partition plates and an outer side vertical plate composition, wherein a through hole is formed in the upper cover plate, the supplement plate is blocked on the through hole, the lower cover plate is parallel to the upper cover plate, the inner side vertical plate is arranged along the length direction of the upper cover plate, the inner side vertical plate is perpendicular to the upper cover plate and the lower cover plate, the inner side vertical plate is arranged in a clamped mode and simultaneously and fixedly welded with the upper cover plate and the lower cover plate, the number of the partition plates is multiple rows, each row of the partition plates is perpendicular to the inner side vertical plate, the upper cover plate and the lower cover plate, the partition plates are interlaced with the inner side vertical plate to form a latticed, the outer side vertical plate composition is arranged along the length direction of the upper cover plate, the outer side vertical plate composition comprises a first vertical plate, an installation plate and a second vertical plate, the first vertical plate, the installation plate and the second vertical plate are sequentially and fixedly welded, the outer side vertical plate composition is parallel to the inner side vertical plate, and the outer side vertical plate composition is simultaneously fixed with the upper cover plate and the lower cover plate. The steering frame contact sleeper beam can optimize performance of an existing steering frame contact sleeper beam.

The invention relates to a method for producing a wind-power mainshaft by local continuous upsetting and all-fibre upset forging. The method comprises the following: step one, the heating of steel ingot; step two, forging; step three, first heat processing; step four, rough machining and ultrasonic inspection; step five, quenching and tempering and heat processing; step six, fine machining, wherein, during the step two, the forging comprises that: (1) a first fire, during which, a steel ingot is subject to upset forging at a forging temperature of between 1250 and 900 DEG C; firstly, the bottom of the steel ingot is sawed off, and the steel ingot is subject to capping and upset forging; (2) a second fire, during which, the steel ingot is stretched towards various directions, marked and subject to intermediate billet cogging; after a pole part is molded, scrap on a T end is chopped and removed; after the forging is finished, the steel ingot returns to a heating furnace for being reheated; (3) a third fire, during which, the steel ingot is subject to local continuous upsetting and all-fibre upset forging; (4) a fourth fire, during which, the steel ingot is subject to rolling and leveling; the pole part is stretched; the disc edge of a hub end on the head part of an intermediate billet material after the local continuous upsetting and all-fibre upset forging is subject to rollingoperation; after the rolling, the intermediate billet material is inserted into a leaking disc component again; the end face of the disc is pressed and leveled; after the shaping of the disc end is completed, a manipulator clamps the disc and stretches the pole part of the intermediate billet material to a dimension of a forgeable piece; thus, the mainshaft forging is completed. The method can improve the fatigue resisting strength of a wind-power mainshaft forging piece.

The invention relates to a rail (10) fixing device with the aid of a tensioning clamp (22, 24) extending from a holding element (26, 28) and is removably arranged on a ribbed plate (14) on which the rail base is mounted. Said ribbed plate is placed on an elastic intermediate layer (30) which is maintained in a required prestressed state by the holding element.

The invention discloses composite microalloyed large-section non-quenched and tempered steel, specifically relates to large-section rolled non-quenched and tempered steel used for a half shaft of an automobile and non-quenched and tempered steel used for a half shaft of an engineering machinery. On one hand, the strength of the large-section non-quenched and tempered steel is increased through increasing C content, and on the other hand, grains are further refined through adding microalloy elements such as Nb, V and Ti, thus maintaining certain toughness while improving strength; in addition,the fatigue strength of the half shaft is improved through employing an induction hardening method, and the hardenability of steel is improved through adding B. The invention effectively solves the use strength requirement of the large-section non-quenched and tempered steel half shaft, guarantees the fatigue life of the half shaft, improves the performance of the half shaft, lowers the cost of the half shafts, saves energy and reduces heat treatment deformation.

The invention provides age-hardening steel having a chemical composition containing 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 1.5 to 2.5% of Mn, 0.005 to 0.08% of S, 0.03 to 0.50% of Cr, 0.005 to 0.05% of Al, 0.25 to 0.50% of V, 0 to 1.0% of Mo, 0 to 0.3% of Cu, 0 to 0.3% of Ni, 0 to 0.005% of Ca, 0 to 0.4% of Bi and a remainder made up by Fe and impurities, wherein the following formulae P <= 0.03%, Ti < 0.005% and N < 0.0080% are satisfied in the impurities, and the following formulae [C+0.3Mn+0.25Cr+0.6Mo >= 0.68], [C+0.1Si+0.2Mn+0.15Cr+0.35V+0.2Mo <= 0.85] and [-4.5C+Mn+Cr-3.5V-0.8Mo >= 0.00] are satisfied. The age-hardening steel has hardness of 290 HV or less before being subjected to an aging treatment, also has an amount of hardening of 25 HV or more and fatigue strength of 350 MPa or more when subjected to an aging treatment, and also has an absorption energy of 16 J or more at 20 DEG C after being subjected to an aging treatment as evaluated by a Charpy impact test that is carried out using a U-notched standard test specimen having a notch depth of 2 mm and a notch root radius of 1 mm. Therefore, the age-hardening steel is extremely suitable as a material for machine parts.

The invention provides a process for manufacturing a high-strength (above) bolt. The process comprises the following steps: selecting a proper steel material, and cutting out a cylindrical blank with proper size; molding the head part and the rod part of the bolt by adopting cold extrusion technology; heating; manufacturing the rod part, including coarse grinding and fine grinding; detecting injury by magnetic powder; manufacturing screw; and performing surface mechanical reinforcement and corrosion resistance treatment. The process solves the technical problems of insufficient strength and fatigue fracture which are easily generated on the bolt existing in the prior art for manufacturing the high-strength bolt, and is a high-strength bolt manufacturing process capable of improving tensile and fatigue strength resistance of the bolt.