32results about How to "Solve the problem of thermal cracking" patented technology

The invention discloses a Cu-Zr-Ag alloy crystallizer copper plate, containing metal Zr of 0.05 to 0.25wt%, deoxidizing agent metal Mg of 0.05wt%, metal Ag of 0.06 to 0.15wt% and metal Cu of 99.65 to 99.77wt%. The invention also discloses a preparation process of the Cu-Zr-Ag alloy crystallizer copper plate, which has better heat conductivity and high pulling resistance and higher softening temperature, the service life of the crystallizer copper plate is prolonged, pull speed of a slab casting machine is improved, production efficiency of slabs is greatly improved, and the copper plate is a novel long-service life crystallizer copper plate suitable for high-pull speed, high-efficiency, high-pace and high-yield continuous casting operation.

The present invention relates to an anode plate of a stainless-steel cold-rolling pickling line and a manufacture method thereof. The anode plate is characterized in that one part of a core plate soaking in acid when the core plate is in acid cleaning is coated by a corrosion-resistant alloy layer which comprises 5-12% of Sb, 0.2-1.0% of Cu, 0.2-1.0% of Bi, 0.1-0.5% of Ce and the balance of Pb and unavoidable impurities. The manufacture method comprises the following steps of: (1) preparing an alloy layer soldering sheet: firstly, preparing a Cu-Sb interalloy: a, using CuSb50 as a Cu-Sb alloy; b, casting the Cu-Sb alloy in a die into a furnace burden; secondly, smelting the alloy: a, preheating a smelting furnace; adding the Cu-Sb interalloy to smelt; b, adding Bi, Sb and Ce; c, adding the rest Pb; d, discharging from the furnace and casting; thirdly, preparing a soldering sheet: casting alloy liquid into a soldering sheet; and (2) welding the soldering sheet: a, polishing the core plate and removing gas; b, firmly clamping the core plate; and c, welding the soldering sheet and the core plate. The anode plate of the stainless-steel cold-rolling pickling line resists corrosion and has low cost.

The invention discloses a method for controlling the brittle Laves phase in the process of laser additive manufacturing of nickel-base superalloy. Preliminary optimization of laser additive manufacturing process parameters, using cooling medium to cool the bottom of the substrate; then using laser modulation technology to modulate the light source to obtain better laser modulation parameters, square wave: peak power: 600 ~ 1000W, pulse frequency : 10HZ~100HZ, duty cycle: 0.3~0.6; sawtooth wave: peak 600~1200W, valley 0W, pulse frequency: 10HZ~100HZ; parameters of sine wave: peak 600~1000W, valley 0W, pulse frequency: 10HZ~ 100HZ; Finally, laser additive manufacturing of nickel-based superalloys is carried out according to the above parameters to obtain formed parts with all fine equiaxed dendrite structures and fine discrete Laves phases. Through the laser modulation method, the invention can effectively control the precipitation behavior of Laves phase in the process of laser additive manufacturing of nickel-based superalloy, reduce the cracking sensitivity of laser additive manufacturing parts, and improve the microstructure.

The invention discloses a method for avoiding a hot crack on the outer layer of a high speed steel roll for rods and wires. The method includes the following steps: a centrifugal pattern is adopted to forge the outer layer of the high speed steel roll; during centrifugal casting of the outer layer, the rotating speed of a centrifuge is changed by phase, and the molten steel casting speed and the rotating speed of the centrifuge are changed accordingly; at the starting phase of the centrifugal casting, a high rotating speed and high-speed casting are adopted; at the medium phase of the centrifugal casting, a medium rotating speed and low-speed casting are adopted; after casting is finished, a low rotating speed is adopted. Through the variable-speed centrifugal casting of molten steel for the outer layer of the high speed steel roll, the molten steel mold filling is facilitated at the starting phase of casting; molten steel is guaranteed to quickly and evenly cover the entire inner chamber of a casting mold; cold-lap, cold shut and other defects are avoided; the stress on the centrifugal outer layer is also improved; element segregation on the outer layer is reduced; stress cracking tendency is reduced; finally, the purpose of preventing the outer layer from the hot crack is achieved.

The invention discloses a method for connecting 2XXX and 7XXX heterogeneous aluminum alloy by the laser filler wire, which is suitable for the connection field of 2XXX and 7XXX-series of heterogeneous aluminum alloy. The method comprises the following steps of: firstly, assembling two aluminum alloy plates to be welded into a butt joint mode; regulating position relationship among a laser focal point, the wire falling point of an aluminum alloy welding wire and a butt joint gap between two aluminum alloy plates to ensure that the laser beam, the welding wire and the welded aluminum alloy plates are positioned on the reasonable opposite positions; and adopting reasonable welding parameters, laser power, welding speed, wire conveying speed and the like, utilizing AlCu or Alsi welding wires as filler material in the welding process to regulate the ingredient of the welding line and improve the performance of the joint. According to the method, the problems that the 2XXX and 7XXX heterogeneous aluminum alloy is difficult to connect, the welding line is softened during melting, and heat checking tendency exists can be solved.

The invention discloses a gasoline engine turbocharger, which comprises a worm wheel casing, a middle body and a compressor casing, wherein the worm wheel casing, the middle body and the compressor casing are connected together. A worm in the turbocharger is provided with a hollow portion, a worm wheel and the worm are fixedly installed together by adopting an electron beam welding process, a heat shield is arranged between the middle body and the worm wheel casing, and a lubricating oil cavity and a cooling water cavity are arranged in the middle body. The worm wheel casing is formed by casting nodular cast iron, an inner thrust bearing is arranged between the middle body and a worm wheel shaft, an outer thrust bearing is arranged between the compressor casing and the worm wheel shaft, and a thrust piece is arranged between the inner thrust bearing and the outer thrust bearing. A sealing sleeve is sleeved on the worm wheel shaft, the outer thrust bearing is installed on the sealing sleeve, and an actuator comprises an air-release valve and an air valve connecting rod. The gasoline engine turbocharger effectively block heat transfer from the worm wheel end to the middle body, ensures lubrication quality of lubricating oil at the worm wheel end, solves the problems including worm wheel shaft getting-stuck, shaft grinding and the like caused by lubrication failure of a floating bearing, and solves the problem that the side of an air compressor of the gasoline engine turbocharger leaks oil.