5results about How to "Improve plastic deformation" patented technology

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.

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 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.