20results about How to "Reduce fatigue cracks" patented technology

The invention relates to the technical field of aero-engines, in particular to a weak-rigidity welding casing blade bending deformation control method which mainly comprises the following steps: firstly, setting the steps of performing electron beam welding on a blade, an inner casing and an outer casing: positioned welding, penetration welding and modification welding; then setting the electron beam welding sequence of strip welding seams between the blade and the inner casing as well as between the blade and the outer casing as the third welding seam, the fourth welding seam, the first welding seam and the second welding seam; and finally, the electron beam welding step in the first step is executed on the four welding seams according to the electron beam welding sequence determined in the second step. According to the mechanism of generation of welding buckling deformation, the welding buckling deformation of the blade is compensated by setting the steps of weak-rigidity cartridge receiver blade electron beam welding and setting the welding sequence, the straightness of the cartridge receiver blade is controlled, meanwhile, the influence on stress concentration parts such as a blade body anti-icing groove hole is reduced, the probability of fatigue cracks is reduced, and the service life of the cartridge receiver blade is prolonged. Therefore, the service life of the engine case is prolonged.

The invention discloses a heat treatment processing method for grain refinement of a large steel forge piece. The heat treatment processing method comprises the following steps: S1, selecting steel suitable for grain refinement; s2, the forge piece is heated to be lower than 700 DEG C at a certain heating speed; s3, the forge piece continues to be heated to the austenitizing temperature; s4, normalizing treatment is conducted on the forge piece; s5, the normalized forge piece is subjected to multiple times of heat treatment cycle operation; s6, the forge piece is heated to the temperature higher than Ac3; s7, tempering treatment is conducted according to requirements; and S8, after heat treatment is completed, ultrasonic flaw detection and other necessary quality detection are conducted on the forge piece. The strength and toughness of the forge piece are remarkably improved, so that the overall mechanical performance of the forge piece is improved, fine crystal grains can more effectively hinder dislocation movement, the material is more difficult to deform when bearing external force, thick and uneven structures and widmannstatten structures generated in the forging process can be eliminated through heat treatment, and the mechanical performance of the forge piece is improved. The microstructure of the whole forge piece is more uniform, and the comprehensive performance of the material is improved.

This invention relates to a double diaphragm coupling that limits radial displacement and provides overload protection. The invention includes a driving adapter plate, comprising a first adapter plate flange and a first connecting surface extending axially along the center of the first adapter plate flange; a driven adapter plate, comprising a second adapter plate flange and a second connecting surface extending axially along the center of the second adapter plate flange; a spacer shaft with circumferentially spaced third connecting blocks extending axially; the first connecting surface and its corresponding third connecting surface are mated by engagement of the first and third connecting blocks; the second connecting surface and its corresponding third connecting surface are mated by engagement of the second and third connecting blocks. This invention limits the radial displacement of the diaphragm coupling when it is subjected to radial offset, preventing damage to the diaphragm and protecting the diaphragm coupling.

The application discloses additive manufacturing 5-series aluminum alloy powder material containing Ce and Yb elements and a preparation method thereof, and comprises the following steps: preparing a mixed material by weighing raw materials according to component proportions, and preparing Al-Mg-Sc-Yb-Ce-Mn-Si pre-alloy powder through vacuum melting and argon atomization, wherein the raw materials are as follows in terms of mass fraction: Mg: 4-12%, Sc: 0.6-0.8%, Zr: 0.1-0.8%, Mn: 0.2-0.5%, Si: 0.3-1.0%, Yb: 0.03-0.8%, Ce: 0.03-0.8%, and the rest is Al and other impurities. The application adds a certain amount of rare earth elements (Yb and Ce) and Mn and Si elements in the traditional AlMgScZr alloy powder, forms a second phase with alloy elements, plays a role in refining grains and improving crack resistance as a refining agent, controls the process, obtains powder with a certain particle size range through airflow screening, carries out additive manufacturing according to a certain process window, and through heat treatment, the strength of the additive manufacturing high-strength and high-toughness aluminum alloy is improved to 550 MPa level while maintaining high plasticity and toughness.

The utility model relates to the field of rubber cups, and discloses a fillet transition rubber cup. According to the rubber sealing ring, stress acting on the rubber sealing ring can be more uniformly distributed through the design of the sealing ring fillets, local stress concentration is avoided, stress distribution is more uniform, material fatigue is reduced, fatigue cracking of the stress concentration place is avoided, meanwhile, the toughness of a product can be improved through the design of the sealing ring fillets, and the service life of the product is prolonged. According to the rubber sealing part of the component, external stress and pressure can be better borne, the risk of breakage or damage is reduced, in addition, the attaching performance of the rubber sealing ring and the contact face can be optimized due to the fact that the toughness is increased, the sealing effect is improved, normal operation of the product is ensured, and the performance requirement is met; the material fatigue can be reduced through the round corner design, and the fatigue cracking risk caused by stress concentration is reduced, so that the fatigue resistance of the sealing ring is improved, and the service life is prolonged.

The invention relates to the technical field of automobiles, and discloses a torsion bar spring adjusting arm assembly which comprises a torsion bar spring, a connecting assembly is arranged at the front end of the torsion bar spring, a mounting sleeve is rotationally connected to the rear end of the torsion bar spring, a buffer box is fixedly connected to the front end of the mounting sleeve, a shaft ring is arranged in the buffer box, and a spring is arranged in the shaft ring. The middle of the shaft ring is fixedly connected with a torsion rod spring through a connecting rod, the shaft ring is symmetrically sleeved with a set of buffering bent pipes, the buffering bent pipes are fixedly connected with a buffering box, pistons are slidably connected into the buffering bent pipes, and the two pistons are fixedly connected with the shaft ring. And the piston divides the interior of the buffer bent pipe into an upper air chamber and a lower air chamber. The service life of the torsion bar spring is prolonged by adding a buffer structure to the torsion bar spring, fatigue cracks are reduced, the vehicle comfort is improved, meanwhile, the design of combining spline teeth and concave hexagonal grooves is adopted, the machining cost and difficulty are reduced, the abrasion condition is improved, and assembling and torque transmission are facilitated.

This invention discloses a cross-linked polyethylene insulated power cable and its preparation method, belonging to the field of power cable technology. The power cable, from the inside out, comprises: a conductor core, a conductor semi-conductive inner shielding layer, a main insulation layer, an insulating semi-conductive outer shielding layer, a semi-conductive buffer water-blocking layer, a corrugated metal waterproof sheath, and an outer sheath. The gaps between the conductor core strands are filled with semi-conductive resistive grease. The cable preparation method includes the following steps: S1, preparing the conductor core; S2, three-layer co-extrusion; S3, water-blocking layer extrusion; S4, sheath extrusion. This invention replaces the non-woven fabric tape with a foamed layer made from a blend of ethylene propylene diene monomer (EPDM) rubber and ethylene-vinyl acetate copolymer / styrene-butadiene rubber composite base material, achieving dynamic absorption of radial displacement in the cable. The synergistic effect of this dual design reduces fatigue cracking of the aluminum sheath caused by expansion thrust and prevents capacitive discharge caused by interfacial air gaps; thus improving the cable's current carrying capacity and periodic reliability.

The utility model provides a kind of exhaust pipe structure and rotatory compressor for rotatory compressor, comprising: exhaust pipe body, hole for connecting equalizing pipe is equipped on exhaust pipe body;Reinforcing structure, it is set on exhaust pipe body, reinforcing structure is used to increase the connecting length of hole and equalizing pipe.The utility model can increase the connecting length of exhaust pipe body and equalizing pipe, thereby increase the welding penetration of exhaust pipe body and equalizing pipe, guarantee welding quality, improve welding strength, thereby reduce the probability that the leakage at this welding place leads to compressor failure.

The invention belongs to the technical field of boiler protection materials. The invention relates to a non-crystalline material, in particular to an erosion-resistant non-crystalline material for a large circulating fluidized bed boiler and a preparation method thereof. The product provided by the invention comprises the following elements in parts by mole: 45 to 50 parts of Fe, 20 to 22 parts of Cr, 5.0 to 5.5 parts of Mo, 3.0 to 3.5 parts of W, 10 to 12 parts of B, 3.0 to 3.2 parts of C, 8.0 to 8.5 parts of Ni, 4.0 to 4.5 parts of Co, 2.2 to 2.5 parts of Mn and 0.4 to 0.6 part of Y; the amorphous material is in a pre-alloyed powder form, the microstructure of the amorphous material takes an amorphous phase as a matrix, and crystal phases with the size smaller than 50nm are dispersed and distributed in the amorphous phase; the degree of sphericity of the pre-alloyed powder is larger than 0.85, and the oxygen content of the pre-alloyed powder is lower than 600 ppm. The obtained material can effectively solve the problem that a formed oxidation film is prone to cracking and peeling off in the boiler thermal cycle process, and consequently the protection capacity of a coating formed in the using process on a boiler is attenuated.

The invention provides a frog forging die with an automatic die opening function and a die forging process of the frog forging die. The frog forging die comprises a lower base plate, a spring, a spring core, a lower die, a limiting block, an upper base plate, an upper cushion block, a guide sleeve, an upper die and a guide column. The upper and lower dies are connected with the upper and lower base plates in a positioning and fastening manner through flat keys; the upper die and the lower die are vertically guided through a guide post and a guide sleeve which are arranged at opposite angles of the base plate in a set manner; the guide sleeve and the upper base plate are installed in a vertical interference fit mode. The guide column and the lower base plate are vertically mounted in an interference fit manner; the number of the springs is four, and two of the springs are arranged on the guide columns at the diagonal positions in a sleeving mode correspondingly. The other two spring cores are sleeved on the spring cores at the diagonal positions; the spring core is vertically assembled on the lower base plate in an interference manner; the upper cushion block is fixedly mounted in the center of the upper surface of the upper cushion plate in a fastening manner. By avoiding clamp manufacturing, manufacturing and mounting of a traditional die forging die connecting die forging press and a die forging upper die clamp are avoided, finally, the die manufacturing difficulty is reduced, the die cost is reduced, and the working efficiency is improved.

This utility model discloses a reinforcement component for an outer ring plate and a box-shaped column in a steel structure building. It includes an outer ring plate welded to the surface of the box-shaped column. A short-faced perforated angle iron is provided at the top of the outer ring plate. A long-shank bolt is threaded into the inner cavity of the short-faced perforated angle iron. The long-faced perforated angle iron is fixedly connected to the outer ring plate via the long-shank bolt. The long-faced perforated angle iron is located at the bottom of the outer ring plate. A nut is threaded into the surface of the long-shank bolt, located below the outer ring plate. Two washers are slidably connected to the surface of the long-shank bolt. This utility model, through the combined use of the short-faced and long-faced perforated angle irons, can reinforce the weld joint between the outer ring plate and the box-shaped column with tensile force, providing additional fixing force beyond welding between the outer ring plate and the box-shaped column. This achieves the goal of providing additional fixing force after the outer ring plate and box-shaped column are fixedly connected, thereby reducing fatigue cracks caused by stress cycles.

This invention discloses a small header structure and operating method for a 650℃ high-efficiency ultra-supercritical tower boiler, relating to the field of boiler technology. It solves the problem of reaching the upper limit of ferritic heat-resistant steel in the main and reheat steam outlet headers of tower boilers. The invention includes a main header, connecting pipes, a small header, and an outlet pipe joint. Each tube panel of the final stage superheater or reheater in the tower boiler is connected to a small header via an outlet pipe joint; the small header is connected to the main header via connecting pipes; the main header, connecting pipes, and small header are all made of iron-nickel-based high-temperature alloy materials. This invention, through the main and reheat steam outlet header and small header structure, can reduce inter-tube temperature deviation, effectively eliminating the thermal stress caused by inter-tube deviation in conventional large header schemes. It can also reduce the wall thickness of the main header, as thermal stress is proportional to wall thickness, thus reducing thermal stress, improving compressive strength, and facilitating flexible operation.

This invention relates to the field of wire rope production technology, specifically to a double-parallel twist crane wire rope and its production process using a double-strand synchronous low-stress twisting method. The wire rope body has a 9-strand parallel twist structure, designated 3X40SF / 3X24F-3X7, comprising: an inner layer of 3 strands with a 3X7 structure twisted in an S-direction parallel twist; and an outer layer of 6 strands twisted in an S-direction parallel twist, with 3 strands having a 3X40SF structure and 3 strands having a 3X24F structure. The inner and outer layers are joined together using a Z-direction parallel twist. The wire rope body is prepared using a pre-tensioned tubular double-parallel twisting process. This invention, through a pre-tensioned tubular double-parallel twisting device, applies a constant and precise online pre-tension force simultaneously during the twisting process, forcing the wire to undergo lattice slip and dislocation reorganization during plastic deformation. This significantly eliminates residual stress generated during twisting and forging, solving the problems of low efficiency and uneven results associated with traditional offline pre-tensioning.

The shell structure of the unmanned aerial vehicle comprises an upper shell, a bottom shell, a vehicle arm and a fastening piece, the upper shell is provided with a first extending part, the bottom shell is provided with a second extending part, after the upper shell is connected with the bottom shell, the first extending part and the second extending part are overlapped to form an inserting part, the vehicle arm is provided with an inserting hole and is connected to the inserting part in a sleeved mode through the inserting hole, and the fastening piece is arranged on the vehicle arm. The vehicle arm, the first extension part and the second extension part are connected through a fastener; according to the shell structure of the unmanned aerial vehicle, a novel mechanical interlocking structure is achieved through the insertion part formed by overlapping the first extension part of the upper shell and the second extension part of the bottom shell, and the stability and integrity of the shell of the unmanned aerial vehicle are enhanced. By means of the design, the assembling process is simplified, dependence on traditional fasteners is reduced, and therefore assembling cost and maintenance difficulty are reduced.

The application discloses a layout wiring method, device and equipment of a special-shaped bending PCB and a medium, relates to the technical field of hardware circuit design, and aims at solving the problem that the existing general PCB layout wiring method cannot meet the high-precision, high-reliability and long-service-life use requirements of an inkjet printing device with a special-shaped bending working condition. The method comprises the following steps: dividing the special-shaped bending PCB into a rigid fixing area, a flexible bending transition area and a limit bending core area according to the bending radius; arranging devices in the rigid fixing area and the flexible bending transition area; adopting different wiring rules to wire each area respectively to obtain a wired special-shaped bending PCB; and performing copper laying, via arrangement and round corner processing on the wired special-shaped bending PCB to complete the layout wiring of the special-shaped bending PCB. The layout wiring method of the special-shaped bending PCB is used to improve the printing precision, reliability and service life of the inkjet printing device with the special-shaped bending working condition.

The utility model relates to a multi-layer metal cylinder gasket of an engine. The multi-layer metal cylinder gasket comprises a cylinder gasket body, the cylinder gasket body is provided with a plurality of threaded holes, a sealing structure, a plurality of cooling liquid holes, a plurality of cylinder holes, a plurality of push rod holes, a plurality of engine oil holes and a plurality of rivets. The cylinder gasket body comprises a first functional layer, a first cylinder opening limiting layer, a second functional layer, a third functional layer, a second cylinder opening limiting layer and a fourth functional layer which are overlapped from top to bottom; and the first functional layer, the second functional layer, the third functional layer and the fourth functional layer are riveted together through rivets. According to the utility model, the sealing capability of the cylinder gasket is improved, and the leakage problem can be better solved; the situation that the engine cost is reduced due to fatigue cracking of the cylinder gasket caused by high pressure is further reduced; and meanwhile, the air leakage problem of the high-detonation-pressure engine is better solved.

The invention provides a welding connection method for high-manganese steel and a steel rail, which comprises the following steps that a transition piece and the steel rail are connected and fixed through flash welding to form a middle piece, and the transition piece is used for connecting a high-manganese steel piece to be welded and the steel rail; normalizing heat treatment is conducted on the middleware, and thermal aging treatment is conducted on the middleware subjected to normalizing heat treatment; and the transition piece and the high manganese steel piece to be welded are connected and fixed through flash welding, so that the high manganese steel piece to be welded and the steel rail are connected and fixed. According to the welding connection method for the high manganese steel and the steel rail, the performance of a final connecting piece product can be effectively improved, internal residual stress of the final connecting piece product is reduced, and the service life of the final connecting piece product is prolonged.

The invention discloses a steel structure stress self-balancing reinforcing device, and belongs to the technical field of building structures, the steel structure stress self-balancing reinforcing device comprises a lower hydraulic plate, a motor is mounted on the lower hydraulic plate, the motor is connected with a hydraulic spring device mounted on the lower hydraulic plate through a hydraulic medium pipe, and the top of the hydraulic spring device is connected with an upper hydraulic plate; a control system is installed on one side of the lower hydraulic plate, the motor is connected with the control system through a wire, and the control system is connected with a stress induction piece through a wire. According to the stress self-balancing reinforcing device for the steel structure, the stress state of the steel structure can be always kept within a reasonable range, the service life of the steel structure can be prolonged, and installation and arrangement are facilitated.

The utility model provides a track shoe shearing and punching die which comprises a bottom plate, a lower die is arranged on the upper surface of the bottom plate, supporting rods are arranged at the four corners of the upper surface of the bottom plate, a top plate is arranged at the upper ends of the four supporting rods, adjusting assemblies are arranged on the front side and the rear side of the interior of the top plate, and the left end of the adjusting assembly on the rear side is connected with a driving motor. The lower ends of the two adjusting assemblies are connected with a positioning plate, the four edges of the lower surface of the positioning plate are each provided with a buffering assembly, and the lower ends of the four buffering assemblies are each connected with a mounting plate. The buffer assembly can reduce the impact force generated when the upper die and the shear knife make contact with materials in the working process, damage to the die or the shear knife caused by too large impact force can be prevented, the service life of the upper die and the service life of the shear knife can be prolonged by reducing impact and vibration, and due to the fact that abrasion and fatigue cracks are reduced through the upper die and the shear knife, the service life of the upper die and the service life of the shear knife are prolonged.

The invention discloses a movable modular steel bridge suitable for strip mine extra-heavy traffic, and belongs to the technical field of steel bridges. Comprising a main beam formed by splicing a plurality of steel boxes through connecting plates, anti-collision beams connected to the two sides of the main beam, a steel cover beam arranged below the main beam and a steel lattice type pier located below the steel cover beam. The steel box girder bridge is adopted, has high bending resistance and torsional rigidity and is suitable for traffic conditions of extra-heavy loads in mining areas, the section form of the steel box girder bridge is a separated multi-box form, the steel bridge is provided with the high-performance stress dispersion layer, pressure of vehicle loads on the steel bridge deck is dispersed, local stress concentration caused by the wheel load effect can be greatly reduced, and the service life of the steel bridge deck is prolonged. The steel bridge pier horizontal force dispersing device can transfer horizontal force generated on the pier when a large mine car is braked to the adjacent pier through the inhaul cable, the problem that the lateral stiffness of the pier is insufficient is effectively solved, and the safety performance of a bridge is improved.