9results about How to "Improve plastic deformation" patented technology

The invention relates to the technical field of brazing, and particularly discloses a tungsten alloy and molybdenum alloy brazing connection method which comprises the following steps: S1, pretreating a tungsten alloy base material and a molybdenum alloy base material; s2, the brazing filler metal is placed between the tungsten alloy base metal and the molybdenum alloy base metal, the foamed nickel is placed between the brazing filler metal and the molybdenum alloy base metal, and a pre-brazed assembly is obtained after compaction; wherein the composition of the brazing filler metal is Ni < re > Ti Zr Cr < c > Cu < d >; and S3, the pre-brazing assembly is placed in a vacuum brazing furnace to be subjected to brazing treatment. The Cu, Cr and Zr elements are added on the basis of conventional Ni-Ti brazing filler metal, and the plasticity, toughness and mechanical property of a connector can be improved. Meanwhile, the metal foam nickel middle layer is added in the brazing process, residual strain energy can be absorbed, the flow dividing brazing filler metal is refined, the microstructure is changed, a stable structure is formed, and the mechanical property of a connector is remarkably improved.

The invention relates to the technical field of valves, in particular to a hard sealing leakage-proof needle valve which comprises a valve seat and a valve element, a mounting cavity is formed in the valve seat, a first sealing face is arranged on the inner wall of the mounting cavity and is in a conical surface shape, a liquid inlet and a liquid outlet are formed in the two sides of the valve seat and communicate with the mounting cavity, and the liquid inlet and the liquid outlet communicate with the valve element. The valve element is slidably arranged in the mounting cavity. The first sealing part, the second sealing part, the middle connecting part and the valve seat are arranged, the first cavity is located between the liquid inlet and the liquid outlet, and the pressure in the first cavity is smaller than the fluid pressure at the liquid inlet and larger than the fluid pressure at the liquid outlet, so that fluid at the liquid inlet is more difficult to flow into the liquid outlet through the first cavity, and the sealing effect is better. In addition, the first cavity is formed, so that the pressure difference borne by the sealing face of the valve element is reduced, the radial or axial stress in the valve element is correspondingly reduced, the problem of plastic deformation of the valve element can be effectively solved, and the sealing effect of the needle valve is improved.

The invention relates to the technical field of polymer composite material preparation, in particular to a super-tough core-shell stereocomplex polylactic acid-based composite material and a preparation method thereof. The super-tough core-shell stereocomplex polylactic acid-based composite material is prepared from the following raw materials in parts by mass: 70 to 100 parts of polylactic acid and 0 to 30 parts of the modified elastomer in claim 4, and the dosage of the modified elastomer is not 0; the modified elastomer is prepared by melting and blending stereocomplex polylactic acid powder and a functional elastomer copolymer; the stereocomplex polylactic acid powder is prepared by reactive melt blending of PLLA and PDLA in an equal mass ratio or an equal molar ratio. The prepared super-tough core-shell stereocomplex polylactic acid-based composite material has excellent tensile strength and impact resistance, can be applied to the field of engineering plastics such as automobile parts, electronic and electric appliance shells, household products, catering tableware and the like, and has remarkable environmental protection benefits and industrial popularization value.

The invention discloses an aluminum alloy battery frame for electric vehicles and a preparation method thereof. The weight percentages of the components of the aluminum alloy are as follows: Si: 0.75-0.80%, Fe: ≤0.15%, Cu: 0.10-0.15%, Mn: 0.45-0.50%, Mg: 0.58-0.63%, Cr: 0.10-0.15%, Zn: ≤0.10%, Ti: 0.03-0.05%, Zr: 0.05-0.1%, and the balance is Al. The battery frame is obtained by smelting, alloying, degassing and deslagging, casting, homogenizing, extruding and aging the aluminum alloy. The battery frame can meet the following requirements: 1) tensile strength ≥305MPa, yield strength ≥280MPa, elongation ≥13%; 2) there is no loss of strength after short-term baking at 205°C for 1h, and the strength loss is within 10MPa after long-term baking at 150°C for 1000h; 3) the collision crush test meets the requirements of the three-peak curve, the energy absorption is ≥30KJ, and the cracking form is uniform without breakage.

This invention discloses a crankshaft-type dual-point multi-link press, relating to the field of press technology. It includes a support table, table body, crankshaft assembly, trolley assembly, and track. The crankshaft assembly includes a motor, transmission gears, a large gear, and a crank-connecting rod mechanism to achieve a "slow down, fast up" stamping motion. The trolley assembly includes a geared motor, drive wheels, and track cleaning blades to achieve smooth transfer of the entire machine and track cleaning. Anti-eccentric load devices are provided on both sides of the crankshaft assembly. These devices include a connecting drive assembly, a guiding and stabilizing assembly, and a clamping support assembly. This invention uses the sliding block to trigger the connecting drive assembly when it descends, which, in conjunction with the multi-link, achieves eccentric load compensation. The guiding and stabilizing assembly provides high-precision vertical guidance, and the clamping support assembly dynamically clamps the guiding structure during the stamping process. The entire machine has a compact structure, stable operation, high stamping accuracy, and strong anti-eccentric load capability.

The invention discloses rolled copper foil for a flexible printed circuit board and a preparation method of the rolled copper foil. The rolled copper foil is prepared from the following components in percentage by mass: 0.002 to 0.005 percent of Ag, 0.01 to 0.1 percent of La, 0.01 to 0.05 percent of Ce, 0.05 to 0.25 percent of Nd, 0.01 to 0.1 percent of O and the balance of Cu and inevitable impurities. The rolled copper foil for the flexible printed circuit board solves the problems of low flexibility and high recrystallization temperature of the rolled copper foil for the flexible printed circuit board, and the comprehensive performance of the rolled copper foil is improved by optimizing new alloy components and a rolling process, so that the rolled copper foil is suitable for flexible and conductive circuit boards with high requirements.

The invention discloses a preparation method of a CoCrFeNiCuPrx high-entropy alloy based on H3Pr, and relates to a CoCrFeNiCuPrx high-entropy alloy. The H3Pr powder and the high-entropy alloy are prepared through a direct hydrogenation method and a powder metallurgy method respectively, and Co, Cr, Fe, Ni and Cu elementary substance powder and intermediate hydride H3Pr powder are weighed according to the proportion; and after high-energy mechanical ball milling, the powder is pressed and molded into a small round ingot, and the small round ingot is sintered through a vacuum rapid hot pressing sintering process, so that all elements are fully diffused. According to the preparation method disclosed by the invention, the CoCrFeNiCuPrx high-entropy alloy is prepared on the basis of H3Pr; the problems that the strength and hardness of the CoCrFeNiCu high-entropy alloy are low and the strength and hardness of the CoCrFeNiCu high-entropy alloy are not obviously improved by elemental Pr are solved, the decomposition temperature of H3Pr during heating is lower than the melting point of metal Pr, released Pr atoms can enter surrounding high-entropy alloy matrix crystal lattices only through short-distance diffusion, segregation of matrix elements and the oxidation tendency of Pr are greatly relieved, and the strength and hardness of the CoCrFeNiCu high-entropy alloy is improved. And a microstructure with relatively uniform components is obtained.

The application discloses a high-pressure assembly performance middle-hole press-fit type powder metallurgy part production process and belongs to the technical field of powder metallurgy, and comprises the following steps: S1, mixing; S2, forming; S3, sintering; and S4, deburring; the mesh belt sintering furnace in the step S3 comprises a dewaxing area, a heating area, a carbon recovery area and a cooling area, the mesh belt width of the mesh belt sintering furnace is 450-600 mm, and the mesh belt advancing speed in the mesh belt sintering furnace is 100-125 mm / min; the application omits the 'processing' procedure, avoids the internal diameter wall gap from being extruded and reduced, omits 'grinding' and 'oil immersion', retains the original gap state of the powder metallurgy product, and monitors the open loop strength and open loop displacement after sampling and detection after sintering, so that the high-pressure assembly requirement of a large interference amount is met, the cracking problem in the part press-fit process is avoided, and the comprehensive production cost is reduced by more than 10% after the multiple steps are omitted.

The utility model relates to the technical field of bolt thread rolling, and discloses a bolt external thread automatic thread rolling machine which comprises an operation table, a fixing support is fixedly installed on the top of the operation table, a box body is fixedly installed on the top of the fixing support, a connecting pipe is fixedly installed on the top of the box body, and a water tank is fixedly installed on the top of the connecting pipe. A one-way valve is fixedly installed in the water tank, a movable pipe is movably installed in the box body, and a telescopic rod is fixedly installed between the movable pipe and the box body. Compared with a traditional thread rolling machine, the thread rolling machine has the advantages that the movable pipe is matched with the cam and the third motor, so that the spray head can indirectly spray water to the outer surface of the thread rolling wheel, the water is indirectly sprayed to the outer surface of the thread rolling wheel through the spray head, the temperature of the thread rolling wheel can be effectively reduced, and overheating deformation or damage is prevented; and the precision and stability of thread rolling machining are ensured, and meanwhile, the water has the dual functions of cleaning and lubricating.