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

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.

The invention relates to a method for manufacturing a vehicle shaft of a high-power alternating current electric locomotive, which comprises the following steps: utilizing European standard EN13261(2005 year edition) performance index to be standard, controlling chemical components of material in the process of smelting as follows, C 0.22%-0.29%, Cr 0.90%-1.20%, Mn 0.60-0.90%, Mo 0.15%-0.30%, Si<=0.40%, P<=0.020%, S<=0.015%, Cu<=0.20%, V<=0.06% and Ni<=0.25%. The process technique of the vehicle shaft of the high-power locomotive comprises the following steps: smelting bar material according to the above chemical component requirements, doing a series of forging for the bar material, shaping, guaranteeing horizontal mechanical property, machining and roughing bar material which is forged to shape, thermally processing the vehicle shaft of the high-power locomotive which is roughed, and finishing the vehicle shaft of the high-power locomotive which is thermally processed.

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 discloses an adjustable finishing broach of wheel disc and tenon slot combination surface. The adjustable finishing broach comprises a mounting section, a cutting section and an adjusting section, wherein the cutting section consists of two halves of separate contour line blade elements and fixed on the mounting section through the adjusting section, and the adjusting section is a replaceable element to adjust the position of the contour line of the cutting section. According to the invention, the dimensional deviation of reground cutting edge can be removed; the geometric accuracy of precisely processed contour line is kept; the tool cost is reduced, and the service life of the tool is prolonged; and the adjustable finishing broach is suitable for broaching machining of the wheel disc and the tenon slot of a heavy gas turbine rotor.

The invention discloses high-strength and high-yield-ratio non-quenched and tempered steel for an automobile engine stretch-broken connecting rod and a production method thereof. The steel comprises the following chemical components in percentage by weight, 0.40-0.50% of C, 0.40-0.60% of Si, 1.00-1.30% of Mn, 0.040-0.060% of S, 0.10-0.20% of V, 0.020-0.035% of Nb, 0.10-0.30% of Cr, 0.10-0.30% of Ni, 0.010-0.020% of N, and the balance Fe and impurity elements. Through the combination of the group distribution ratio and a controlled rolling and controlled cooling process, the mechanical propertyRel of the connecting rod material is greater than or equal to 850 MPa, the Rm is greater than or equal to 1000 MPa, and the yield ratio can reach more than 0.84, so that the light weight of an automobile engine is facilitated.

A passenger-vehicle four-end braking system test device is characterized in that a DC (direct current) velocity modulation motor is fixedly arranged on a main bottom plate; an output shaft of the DC velocity modulation motor is connected with an inertial flywheel taper shaft through a coupling; the output end of the flywheel taper-shaft is connected with an input shaft of an intermediate axle through a coupling; the output end of the intermediate axle is connected with an input shaft of a rear axle through a transmission shaft; a drum brake clamp is respectively arranged on hub ends of the intermediate axle and the rear axle; a drum brake of a drum-style brake is mounted on the drum brake clamp and a brake shoe matched with the drum-style brake is arranged on a brake shoe clamp; and the brake shoe clamp is connected with a torque sensor through a mounting shaft. The invention adopts the motor to drive the flywheel to rotate and the flywheel can idle without power after the preset rotation speed is reached; and the braking to the whole test device can be realized by four-end brakes, the braking process of vehicles can be effectively simulated, and the four-ends brakes can be tested simultaneously in the braking process so as to provide evidence for both the performance test of the braking system and the research of the braking process.

The invention discloses a welding method for TKY joints of a steel structure. The welding method includes the following steps that firstly, a 1: 1 example intersecting line cutting simulation test isperformed; secondly, intersecting line cutting is performed; thirdly, fitting up and positioning are performed; fourthly, weld joint edge terminated lines of the TKY joints are drawn; fifthly, backingwelding is performed to form a bottoming layer; sixthly, filling welding is performed to form a filling layer; and seventhly, surface covering welding is performed to form a surface covering layer, current of a welding device is decreased into the range of 100-130 A, welding stops when the distance from welding to a groove edge line is 0.3 mm to 2 mm, then from the weld joint edge terminated lines, arranging and welding are sequentially in transition to the groove edge of a branch pipe, and a surface covering layer weld joint and parent metal are made to be in smooth transition. The welding method guarantees that the fatigue strength and other mechanical performance of the TKY joints reach standards, one-time welding forming is performed, root portion defects are not likely to be caused,weld joint grinding is reduced, the labor intensity of workers and the production cost are lowered, and the production efficiency is improved.

The invention discloses a thread core-pulling rivet and a riveting method using the same. The thread core-pulling rivet comprises a rivet rod with a limiting cap, a driving ring mounted on the rivet rod in a threaded mode and a rivet sleeve arranged on the rivet rod in a sleeving mode and located between the limiting cap and the driving ring. A blocking head matched with the limiting cap in an abutting mode is arranged at one end of the rivet sleeve, and the other end of the rivet sleeve and the driving ring are matched circumferentially in a positioned mode. In riveting, the rivet rod rotatesrelative to the rivet sleeve, the driving ring and the limiting cap apply force to the rivet sleeve oppositely to enable the rivet sleeve to be deformed, and after riveting, a deformed part of the rivet sleeve and the blocking head abut against the two sides of a riveting part. The thread core-pulling rivet has high pre-tightening force, tensile strength and fatigue strength after being mounted and is easy to assemble, so that the manufacturing difficulty and cost are reduced.

The invention discloses an orthotropic steel bridge deck ductile concrete composite structure and a construction method, and relates to the technical field of bridge engineering. The key points of thetechnical scheme are as follows: the orthotropic steel bridge deck ductile concrete composite structure comprises an orthotropic steel bridge deck, a grid mesh and a tough concrete layer; a pluralityof longitudinal ribs are transversely arranged on the bottom surface of the steel bridge deck at intervals; shear nails are arranged on the top surface of the steel bridge deck; a plurality of criss-cross erecting rib perforated plates are arranged on the top surface of the steel bridge deck at equal intervals; and an SBS modified asphalt SMA pavement layer is paved on the top surface of the tough concrete layer. The combined structure can improve the overall rigidity of the steel bridge deck and improve the fatigue problem of the steel bridge deck system and has the advantages of light self-weight, high bearing capacity and simple structure, and can ensure that the steel bridge deck has a wide application range and good stress performance under various conditions; bridge construction cost is saved, and benefits are remarkable. The national key research and development plan subsidy is obtained, the subject name is the key technical research of the efficient construction of the combined structure urban bridge, and the subject number is 2017YFC070348.

The invention relates to an anchoring device and a tower. The anchoring device is used for connecting an inhaul cable and a tower body, the anchoring device comprises an annular body, the annular bodycomprises a base body and a connecting body which are successively arranged in the radial direction of the annular body, the base body is provided with a plurality of installation holes penetrating in the axial direction of the annular body, the installation holes are formed in the circumferential direction of the annular body at intervals, the connecting body is connected with the inhaul cable through connecting positions, and the connecting body is provided with the plurality of connecting positions distributed at intervals in the circumferential direction so as to be connected with the inhaul cable. The embodiment of the invention provides the anchoring device and the tower, the anchoring device can be used for connecting the inhaul cable and the tower body, the weld joint length and the fatigue strength of the tower body cannot be affected, meanwhile, machining and manufacturing of tower barrel sections of the tower body cannot be affected, the cost is low, and the assembling efficiency of a wind generating set can be guaranteed.

The invention belongs to the technical field of welding and particularly relates to a weld bead residual stress eliminating device and method. The device comprises a base, an eliminating unit and a fixing unit, wherein the eliminating unit is fixed to the base and comprises a guide rail plate, a first support, a second support and an ultrasonic impact head, the fixing unit comprises a fixing plate, a second air cylinder and a pressing plate, when a part is fixed, the first support is controlled to slide in the cross-shaped sliding groove to adjust the position, a swinging angle of the second bracket is controlled through extension and retraction of a first cylinder, when an ultrasonic impact head is close to the welding bead, the ultrasonic impact head is started, so the residual stress ofthe welding bead is eliminated, the residual stress of the part at the welding bead is reduced, the fatigue strength, brittle failure resistance, stress corrosion cracking resistance and high-temperature creep cracking resistance of a part structure are guaranteed, and the welding machining quality of the part is improved.

The invention discloses a bonding glue used for glass mosaics. The bonding glue is mainly prepared from the following raw materials by weight: 20-70% of a mixed monomer, 10-60% of styrene, 5-50% of water-based polyurethane, 1-6% of an emulsifier, and 0.1-3% of an initiator. The mixed monomer comprises acrylic ester, hydroxyethyl acrylate, acrylic acid and vinyl trimethoxysilane. The emulsifier is an emulsion prepared from vinyl alkylphenol polyoxyethylene ether sodium sulfate and anions. The initiator is a water-based initiator and/or a peroxide initiator. Correspondingly, the invention discloses a preparation method of the bonding glue used for glass mosaics. The method consists of: preparing a pre-emulsion, adding the initiator to conduct polymerization, removing residual monomers, adding the water-based polyurethane to perform blending crosslinking, carrying out dosing treatment, and performing cooling and discharging, thus obtaining the bonding glue. According to the invention, the bonding glue has an interpenetrating network (IPN) structure, and has the characteristics of excellent bonding effect, high strength, vibration resistance, and impact resistance.

The invention discloses a preparation method of rolling mill bearing steel. The preparation method comprises the following steps: (1) smelting and alloying: performing electric furnace smelting and tapping, and adopting external refining and vacuum degassing treatment; (2) pouring: adopting die casting or continuous casting, controlling the superheat degree of the continuous casting tundish at 40-50 DEG C, and controlling the casting speed of the continuous casting at 1.1-1.3m/min to guarantee the quality of the casting billet; (3) rolling, wherein the soaking temperature of the billet in a heating furnace is 1,180-1,200 DEG C, the heating time is 2.5-3.5 hours, the initial rolling temperature is 1,110-1,130 DEG C, and the final rolling temperature is 820-840 DEG C; (4) cooling control, wherein the cooling speed of the rolled steel is 3-5 DEG C/min; (5) heat treatment: heating the billet to 960-980 DEG C, preserving heat for 1-2 hours and performing oil quenching, and then tempering, wherein the heating temperature in tempering is 180-190 DEG C, and the temperature is kept for 2-4 hours.

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 purpose of the present invention is to provide: a piston ring with which aluminum adhesion can be prevented over long periods even when used in a high temperature, high pressure environment and which exhibits excellent side surface abrasion resistance; and a manufacturing method therefor. By forming a nitride layer on the upper and/or lower side surface of the piston ring and then applying a phosphate chemical conversion treatment, the nitride layer is made to comprise granular and/or worm-shaped surface forms.

The invention discloses a highway pavement construction method, which comprises the following steps of primarily pressing a roadbed by adopting a vibrating road roller, then finishing repair of the roadbed, and eliminating all crushed matters, bulges and hollowing matters; laying self-made limestone soil on the roadbed to form a pavement bedding; spreading aggregates on the bedding layers by layers by adopting a crushed stone spreader according to a preset width and a preset thickness, fully rolling a laid crushed stone layer by adopting rolling equipment, performing leveling after rolling byadopting a land leveling machine, and uniformly spreading steel fiber reinforced self-compacting cement on the crushed stone layer according to a preset dosage by adopting a powder spreading vehicle;performing mixing to form a pavement base course by adopting a cold recycling machine; and constructing a seal course on the pavement base course, and then laying a pavement surface course. The highway pavement construction method is short in construction period, reduces pollution to environment while reducing the manpower and ensures the loading strength, the fatigue resistance, the compressive strength, the impact strength and the stability of a pavement.

The invention discloses a lightweight fractal gradient gear. The lightweight fractal gradient gear comprises a gear body and is characterized by further comprising two plate bodies, wherein the platebodies are fixed to the two sides of the gear body; and the gear body is of a porous lightweight structure, wherein the porous lightweight structure at least is composed of a first-stage gradient holegroup, a second-stage gradient hole group and a third-stage gradient hole group which are constructed in a staggered mode. According to the lightweight fractal gradient gear, a honeycomb type multi-cell structure serves as a prototype, and gradient type, split type and multi-type design is carried out, so that the maximum lightweight of the gear is achieved, and manufacturing is convenient.

The invention discloses a non-joint wire embedding device for random-embedded windings of a large-power motor stator. The non-joint wire embedding device comprises a base, wherein a supporting plate is rotationally connected to the base; at least three wire releasing frames are rotationally connected to the first supporting plate; a horizontal wire releasing rod is arranged on each wire releasing frame and passes through the wire releasing frame; the middle of each wire releasing rod is rotationally connected with the corresponding wire releasing frame; and fixing devices are arranged at two ends of each wire releasing rod. The invention further discloses a wiring method, which sequentially comprises the steps as follows: variable-frequency enameled circular electromagnetic wires are wound on circular wire discs; a stator iron core is vertically placed on a rolling frame; two wire releasing devices are respectively placed on two sides of the stator iron core; the wire discs are evenly placed on the wire releasing rods of the wire releasing devices on the two sides of the stator iron core by phase number; the variable-frequency enameled circular electromagnetic wires are embedded into the stator iron core; and after the wires are embedded into the stator iron core, the end parts of coils are manually bent. The non-joint wire embedding device and the wiring method have the advantages that the wires are continuously and randomly embedded into the stator iron core, the insulating integrity of the windings is guaranteed, materials and production costs are saved, and the performance of the motor is improved.

The invention discloses a clamp for preparing a coating on the selective surface area of a blade and a preparation method of the coating. The clamp comprises a blade fixing shaft, a cover plate bracket, an upper cover plate and a lower cover plate, wherein the blade fixing shaft is connected with the cover plate bracket, the upper cover plate is mounted on the upper end face of the cover plate bracket, the lower cover plate is mounted on the lower end face of the blade fixing shaft, and the upper cover plate and the lower cover plate are connected in a staggered clamping manner. The blade canbe clamped and fixed by using the clamp when a hard coating is sprayed on an engine blade or a turbine blade, the coating meeting the requirements of erosion and fatigue performance is prepared on thesurface of the blade by using a zonal coating process, the requirement for locally spraying the hard coating on the engine blade or the turbine blade is met, the erosion damage of the surface of theblade is reduced, and the fatigue strength of the blade is ensured. The clamp has the advantages of being simple in structure, convenient to use and reasonable in design.

The invention discloses steel for a rolling mill bearing. The steel is composed of the following chemical components in percentage by weight: 1.05-1.15% of C, 0.3-0.5% of Si, 1.3-1.5% of Mn, 1.1-1.3% of Mo, 0.2-0.4% of V, 1.2-1.4% of Cr, 0.4-0.6% of Ni, 0.2-0.4% of Cu, less than or equal to 0.015% of S, less than or equal to 0.015% of P, 0.02-0.04% of Ti, less than or equal to 15*10<-4> of O, less than or equal to 2*10<-4> of H and the balance of Fe and unavoidable impurities.