40results about How to "Guaranteed mechanical performance requirements" patented technology

The invention relates to an absorbable iron-based alloy implantation medical appliance which includes an iron-based alloy base body, a degradable polymer formed on the surface of the iron-based alloy base body, and a corrosion inhibiting layer formed on the surface of the iron-based alloy base body. The corrosion inhibiting layer can delay corrosion on the iron-based alloy base body in early stage and ensures mechanical performances of the implanted medical appliance in early stage, and also can inhibit degradation of the polymer in the early stage of implantation of the medical appliance, thereby reducing usage amount of the degradable polymer and reducing risk of inflammation reaction.

A structural conductive silicone rubber for electromagnetic shielding and its preparation, belonging to the technical field of conductive polymer composite materials. Conductive silicone rubber composite material with double-layer or multi-layer structure, and a layer of base glue is coated between the layers as an insulating adhesive layer. Conductive silicone rubber composite material: conductive powder, silicone containing vinyl polydimethylsiloxane Rubber matrix, acetylenic alcohol inhibitor, platinum catalyst, crosslinking agent. The structural conductive silicone rubber prepared by the invention can effectively improve the shielding efficiency and performance stability in the 100KHz-18GHz wide frequency range while ensuring the general mechanical performance requirements.

The invention discloses a Cr / N-containing high-manganese austenitic steel plate and a preparation method thereof. The Cr / N-containing high-manganese austenitic steel plate comprises the following chemical components in percentage by weight: 0.28-0.32% of C, 24.8-25.2% of Mn, 2.8-3.2% of Cr, 2.8-3.2% of Al, 0.02-0.20% of N, at most 0.015% of P, at most 0.005% of S and the balance of Fe. The preparation method comprises the following steps: smelting molten steel according to set components, casting into an ingot, heating to 1200 DEG C, keeping the temperature for 2 hours, forging into a plate blank, carrying out hot rolling until the thickness is 6mm, carrying out homogenizing treatment, carrying out cold rolling to the thickness of 1mm or so, and finally, carrying out solution treatment, thereby obtaining favorable strength-plasticity compatibility and having certain oxidation resistance and corrosion resistance.

The invention discloses steel for a high-pressure pipeline valve and a manufacturing method of the steel. The steel for the high-pressure pipeline valve comprises components in percentage by weight as follows: 0.19%-0.23% of C, 0.15%-0.25% of Si, 0.95%-1.10% of Mn, smaller than or equal to 0.30% of Cr, smaller than or equal to 0.40% of Cu, smaller than or equal to 0.020% of S, smaller than or equal to 0.020% of P, smaller than or equal to 0.40% of Ni, smaller than or equal to 0.12% of Mo, 0.010%-0.040% of Ti, smaller than or equal to 0.03% of V, smaller than or equal to 0.02% of Nb, 0.015%-0.025% of Al, smaller than or equal to 15*10<-6> of O, smaller than or equal to 90*10<-6> of N and the balance of Fe and inevitable impurities. Through content control of carbon and manganese elements, the mechanical property requirements of steel are guaranteed, meanwhile, the content of residual elements is controlled, the material welding property requirement is guaranteed, the fatigue strength of steel is enhanced, and the valve stability is guaranteed. Through control of molten iron (or pig iron) mixing proportion, furnace slag refining amount, VD (vacuum degassing) furnace operation and reinforced water gap protection and casting effect, titanium is added for nitrogen fixation, and the nitrogen content can be controlled below 90 ppm.

A method for producing an in-situ 3D printing custom mask based on facial feature extraction, belonging to the field of 3D printing technology and medical protective gear. The present invention uses software such as SolidWorks, Magics, etc. to design and optimize the mask model, and ANSYS finite element simulation is used to verify whether the comprehensive performance of the designed model reaches the expectation, and the final optimized part outside the mask at a position of 2 cm perpendicular to the face direction is processed by molds, Place the processed part of the mask that is 2cm perpendicular to the face direction at the bottom of the FDM 3D printing device. On this basis, in-situ 3D print the part of the mask that is close to the face within 2cm perpendicular to the face direction. The mask after printing is completed. After a series of post-processing, the real object finally gets an in-situ 3D printed personalized mask based on facial feature extraction with excellent mechanical properties, excellent mechanical properties, light weight and comfort.

The invention discloses a heat treatment process for large 35CrMo steel axis forgings. The heat treatment process comprises the following steps of: performing one-time forging on the forgings at the temperature of higher than 800DEG C, and performing air cooling until the surface temperature is 500-600DEG C; heating to the temperature of between 870 and 880DEG C, keeping the temperature for 3.8 to 4 hours, taking out of a furnace, vertically putting into water at a speed of 2-3 meters per second, pulling out at a speed of 3-5 meters per second after the forgings are completely put into the water, and performing air cooling to normal temperature; preliminarily cutting, heating to the temperature of between 600 and 620DEG C, and keeping the temperature for 0.4 to 0.6 hour, continuously heating to the temperature of between 830 and 850DEG C, keeping the temperature for 3.4 to 3.6 hours, taking out of the furnace, vertically putting into an AQ251 solution at a speed of 2-3 meters per second, and cooling to room temperature; and heating to the temperature of between 680 and 690DEG C, keeping the temperature for 5.5 to 6 hours, taking out of the furnace and performing air cooling. By the heat treatment process, the internal stress of the forgings can be effectively controlled in the heating process, plastic deformation and internal cracks are avoided, the heating time for the forgings is effectively shortened, and energy consumption is reduced.

Core rod of compound hollow insulator is composed of composite tube 1, composite tube 3, and some shape bars 2 in composite material arranged in circumference between tube 1, and tube 3. Filler 4 in composite material is filled in interspaces among shape bars. Fillers 4 are made from rosin based composite material through pultrude combined circumferential wrapping, laying down or rolling techniques. Shape bars 2 are prepared through continuous fiber pultrude, or pull wrapping or hand pasting. Composite tube 1 and composite tube 3 are prepared through wrapping fiber yarn or rolling glass fiber cloth, or combining both manners. Features are: reasonable structure, excellent electric specification, reduced weight of core rod of compound hollow insulator, and ensuring requirement of mechanical properties so as to put materials to good use.

The invention provides an extensible platform of a power supply controller. The main structure of each structure module of the extensible platform of the power supply controller is a tetrahedral structure hollowed out as a whole and provided with a front panel, a rear panel, a top panel and a bottom panel, and hollowed-out grids are arranged in each module and include at least two layers of grids. Devices in each structure module are laid out three-dimensionally in the grids, so that internal space of the power supply controller is effectively utilized, and three-dimensional layout in the modules is achieved. A reinforcing frame not only provides an installation space but also connects all the modules as a main force bearing component of the whole controller, so that the strength of connection between the modules and the rigidity and the strength of the whole controller meet the requirements of a satellite mechanical environment. A capacitor (CAP) module is used for containing capacitors, the large number of capacitors are used in cooperation with the other modules to stabilize bus voltage, and thus good extensibility is achieved. Due to the use of installing holes and reverse-penetration holes, it is guaranteed that mechanical property requirements of device connecting pieces in the mechanical analysis and environment test process are met.

The invention relates to an accurate control method for a lateral bending problem of a large-specification and large-wall-thickness-difference multi-cavity aluminum profile material. The accurate control method includes the following steps that firstly, an aluminum bar is heated; secondly, an extrusion barrel is heated; thirdly, extrusion is carried out, specifically, the aluminum bar subjected toheat preservation is put into an extrusion machine to be extruded, the temperature of the extrusion barrel is kept at 420-440 DEG C, the temperature of the aluminum bar is kept at 490-510 DEG C, thetemperature of an extrusion mold is kept at 480-500 DEG C, and the extrusion speed is controlled to be 4+ / -0.5 m / min; fourthly, online quenching is carried out, specifically, two rows of spraying nozzles are arranged in the extrusion direction of the aluminum profile material, the length of the two rows of spraying nozzles in the extrusion direction of the aluminum profile material is 3 m, the water sprayed by the spraying nozzles is shaped like a 45 degree cone, the water spraying flow of the nozzles on the side, with larger wall thickness, of the aluminum profile material is controlled to be11.5-12.5 m3 / h, the water spraying flow of the nozzles on the side, with smaller wall thickness, of the aluminum profile material is controlled to be 7.5-8.5 m3 / h, the ratio of the water spraying flow of the thicker side to the water spraying flow of the thinner side is controlled to be 1.3-1.8; and fifthly, straightening is carried out, specifically, the straightening rate is 1-2%. The problem of lateral bending of the profile material can be solved.

The invention discloses an ultra-low carbon bainite thin gauge steel plate rolled through a heavy and medium plate mill. The ultra-low carbon bainite thin gauge steel plate comprises, by weight, 0.02%-0.08% of C, 0.10%-0.40% of Si, 0.90%-2.00% of Mn, 0.018% of P or less, 0.005% of S or less, 0.40% of Cu or less, 0.0003% of B or less, 0.10%-0.55% of Ni, 0.10%-0.40% of Mo, 0.12%-0.60% of Cr, 0.030%-0.090% of V, 0.010%-0.035% of Nb, 0.005%-0.035% of Ti, 0.060% of Als or less and the balanced Fe and inevitable impurities. A production method comprises the steps of smelting, casting, heating, rolling, slitting, intermediate material heating, rough rolling, finish rolling and cooling control. The ultra-low carbon bainite thin gauge steel plate is reasonable in process, good in product performance and small in unevenness and can be widely applied to bridge U rib structures.