45results about How to "Improve lateral performance" patented technology

A system for adjusting the compliance of a wheel is provided. In one embodiment, wheel segments are adjusted, causing the stiffness of the wheel to change. Such adjustments can be made while the wheel is rotating, allowing the wheel compliance to be changed while a vehicle is in motion.

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

This invention relates to a production method for cold forming high intensity welded construction steel taking low carben-Mn as the basis, added by Nb, Ti microalloy as the main composition and applying melted iron desulfurization technology, converter top and bottom combined blowing and vacuum process, among which, the melted steel is casted to slab after rare earth or Ca to be casted to slab process then to be rolled to cut deal or hot rolled plate by cut deal production technology or the hot tandem rolling technology.

The present disclosure relates to a particularly effective well configuration that can be used for SAGD and other steam based oil recovery methods. Fishbone multilateral wells are combined with SAGD, effectively expanding steam coverage, but the fishbones are preheated to mitigate plugging problems, with e.g., resistive heating, EM heating or chemical heating.

The invention provides a kind of medium alloy ultrahigh strength and toughness rare earth steel and relates to the technical field of rare earth steel, in particular to medium alloy ultrahigh strengthand toughness rare earth steel and a preparation method thereof. The medium alloy ultrahigh strength and toughness rare earth steel is characterized by comprising, by mass, 0.26%-0.31% of C, 0.50%-0.80% of Mn, 1.25%-1.60% of Si, less than or equal to 0.005% of S, less than or equal to 0.010% of P, 3.25%-3.60% of Cr, 0.80%-1.20% of Ni, 0.35%-0.60% of Mo, 0.40%-1.00% of W, 0.02%-0.04% of Nb, 0.20%-0.40% of V, 0.0045%-0.006% of La and 0.0105%-0.014% of Ce. The medium alloy ultrahigh strength and toughness rare earth steel has the characteristics of being high in strength, hardness, toughness andthe like, can also reduce the production cost and achieves a lot of positive effects meeting the application requirements.

The invention relates to a method for preparing a flame retardant rail transit vehicle interior floor based on a foaming process. The interior floor comprises an upper surface layer, a core material and a lower surface layer arranged in sequence. The upper surface layer, the core material and the lower surface layer are compounded through heating and pressing to form the interior floor. The core material is a foam sheet. The upper surface layer and the lower surface layer are prepared from fabrics obtained by weaving multilayer unidirectional continuous glass fiber reinforced thermoplastic resin prepregs and/or glass fiber fabric-reinforced thermoplastic resin prepregs and/or glass fibers and thermoplastic resin co-extruded fibers. The polymer resin foams to form a lightweight foamed sheetas the core material through a physical or chemical foaming process. The lightweight composite core material has light weight and can absorb noise. The surface layers and the core layer are preparedfrom the same polymer. The base layer materials can be bonded through a direct practical hot pressing process and the base layer materials can be bonded with the surface layers directly through a hotpressing process without glue so that the glue spraying process is avoided. The floor materials can be recovered, is environmentally friendly and is easy to process.

The invention discloses a Ni-Cr-based precipitation-hardening deformable superalloy material and a preparation method thereof. Required elements are melted in a vacuum induction furnace at a melting temperature of 1450-1460°C; the content of each element is adjusted during the melting process, Make the weight ratio meet the design requirements, pour the solution into a consumable electrode; remelt and refine the poured consumable electrode in an electroslag furnace, and remelt it into an electroslag ingot; heat and forge the electroslag ingot to make a steel rod ; Air-cool the steel rod to room temperature after forging; treat the surface of the steel rod; take samples from the finished steel rod to check the mechanical properties, and carry out the corresponding mechanical property test. The beneficial effects of the present invention are: the Ni-Cr-based precipitation-hardening deformed superalloy material and the alloy material prepared by the preparation method make the transverse performance and longitudinal performance relatively close, while improving the transverse performance, the alloy can also be improved The heat resistance performance in the use process can improve the service life of the products made of this kind of alloy, and has good economic and social benefits.

The invention relates to a rare earth treatment method of a continuously cast 20 steel crack-free tube blank, belonging to the ferrous metallurgical field. The method is as follows: the cored wire feeding speed of the rare earth metal wire changes with the casting speed of a continuous casting machine, rare earth is distributed uniformly in the casting blank; the cored wire of a rare earth wire is inserted from one side of a submerged entry nozzle, the optimum insertion depth is 150mm; the optimum weight ratio of rare earth (RE/S) to sulfur in molten steel is 4.2; when the RE/S is 1.7, rare earth can be used to increase the equiaxed crystal rate of the 20 steel tube blank, reduce the columnar zone, disorder the first interference direction turbulence, decrease the secondary interference space, improve the central refraction and reduce the subsurface cracks; and when the RE/S is 4.2, rare earth can be used to completely change the morphologies of the inclusions in steel, convert manganese sulfide, silica, aluminium oxide and other inclusions to rare earth sulfide, rare earth oxysulfide, rare earth silicate, rare earth aluminate and the like, eliminate the inner cracks in the 20 steel tube blank and increase the transverse properties of the tube.

A tire having an asymmetric tread pattern that land proportion of outer side area 2o is larger than inner side area 2i, but having a reduced difference in drainage performance between tires on right and left wheels, the tire having tread surface 2 divided by four circumferential grooves 3 and 4 into center land 5, middle lands 6, 6 and shoulder lands 7, 7, wherein middle land 6o and shoulder land 7o in the outer side area 2o are divided respectively by outer middle lateral grooves 8o and outer shoulder lateral grooves 10o into blocks 9o and blocks 11o, inclination direction of the middle lateral grooves 8o is opposite to that of the shoulder lateral grooves 10o with respect to tire axial direction, and the lateral grooves 8o and 10o are inclined at an angle θmo between 5° and 45° and at an angle θso between more than 0° and not more than 40°, respectively.

The invention discloses a production method of ultra-low anisotropic non-oriented silicon steel for an oversize generator. The production method comprises the steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into a plate blank, hot rolling, normalizing pickling, cold rolling, annealing, coating and finishing. Wherein the non-oriented electrical steel comprises the following components in percentage by weight: less than or equal to 0.003% of C, 2.80-3.60% of Si, 0.15-0.45% of Mn, less than or equal to 0.04% of P, 0.4-1.2% of Als, less than or equal to 0.002% of S and the balance of Fe and other inevitable impurities; a continuous annealing furnace is adopted for annealing, the annealing temperature of a heating section and a soaking section is controlled to be 860-1030 DEG C, the speed of the strip steel is 90-130 m/min, the unit tension of the strip steel at an inlet and an outlet of the annealing furnace is smaller than 2.5 N/mm < 2 >, and the unit tension of the strip steel at the soaking section in the annealing furnace is smaller than 1 N/mm < 2 >. According to the non-oriented silicon steel, the iron loss P15/50 is smaller than or equal to 2.5 W/kg, the magnetic induction B50 is larger than or equal to 1.65 T, the magnetic induction B100 is larger than or equal to 1.76 T, the iron loss P15/50 anisotropy is smaller than or equal to 8%, and P10/50C is smaller than or equal to 1.12 W/kg.

The invention discloses a tapered wedge and swing bolster elastic connection damping device for a wagon bogie and the bogie, solves the problems of low rhombus deformation resistance of the bogie andweak control capability between a swing bolster and a side frame due to vertical vibration and transverse vibration on a main friction surface in the prior art, and has the benefits of effectively improving the transverse performance of the bogie and improving the rhombus deformation resistance of the bogie. According to the specific scheme, the tapered wedge and swing bolster elastic connection damping device for the wagon bogie comprises the swing bolster, side frames and tapered wedges, the swing bolster is connected between the two side frames, the tapered wedges are arranged at the positions, where the side frames are arranged, of the swing bolster, and the tapered wedges are arranged between the swing bolster and the side frames; the tapered wedges are connected with the inner sidesof the side frames through mortise and tenon structures so that the tapered wedges can only move vertically, elastic pieces are arranged between the two side faces of each tapered wedge and the swingbolster and make contact with the tapered wedges and the swing bolster respectively, and damping springs are arranged on the bottom sides of the tapered wedges and the bottom side of the swing bolster.

The invention discloses a high-speed rail vehicle bogie which is arranged in an inner axle box mode, a hinged framework is supported on the inner side of a wheel set, the curve passing performance ofthe bogie can be effectively improved, the hinged framework is of a double-T-shaped structure, the central axes of cylindrical beams of two T-shaped side beams coincide, one cylindrical beam stretchesinto the other cylindrical beam. Two bearings with a certain transverse span are arranged between the two T-shaped side beams, the two T-shaped side beams can rotate freely, the torsional rigidity ofthe bogie is zero, the uniform load capacity, the line adaptability, the curve trafficability and the high-speed operation stability of the bogie are enhanced. The contradiction between the operationstability and the curve trafficability of a traditional bogie is fundamentally solved, the two primary suspension devices are adopted, the positioning rigidity of the primary suspension devices in all directions can be determined by independent components, the positioning rigidity of the primary suspension devices in all directions can be optimal at the same time, and parameters are more accurateand reliable.

The invention discloses a partial cable-stayed bridge of a steel truss web type concrete composite beam and a construction method thereof. The cable-stayed bridge comprises main beams, each main beamcomprises a tower beam consolidation area, a beam end area and a steel truss web area, a main tower is arranged at the tower beam consolidation area, stay cables are arranged between the main tower and the main beams, each main beam steel truss web area comprises a concrete top plate and a concrete bottom plate, and a steel truss web is arranged between the concrete top plate and the concrete bottom plate. The construction method comprises the steps of assembling the steel truss web sections; hanging stay cables between the main tower and the main beams, and completing initial tensioning; pouring a concrete top plate by taking the steel truss web sections as supports of a cast-in-place platform; pouring a concrete bottom plate by taking the steel truss web sections as a support of the cast-in-place platform; curing the concrete top plate and the concrete bottom plate; tensioning the transverse retard-bonded prestressed steel beams; and carrying out next section construction. The earthquake working condition applicability of a traditional concrete partial cable-stayed bridge is broadened, and the cable-stayed bridge has wide application prospects in large-span bridges in high-intensity earthquake areas.