17results about How to "Reduce internal defects" patented technology

This invention discloses a method for preparing a novel ultra-high voltage high-performance composite insulating material, belonging to the field of composite insulating material preparation technology. The technical solution includes the following steps: S1, preparing a modified epoxy-silicone rubber composite resin matrix: 40-50 parts by weight of bisphenol A type epoxy resin (E-51) are placed in a reaction vessel, heated to 60-70℃, and continuously stirred at a stirring rate of 300-500 r / min. 10-15 parts by weight of terminal hydroxyl polysiloxane (molecular weight 5000-10000) are added, and the temperature is kept constant for 1.5-2 hours; subsequently, the system temperature is lowered to 40-50℃. The beneficial effects of this invention are: by setting up a resin matrix system of "terminated hydroxyl polysiloxane modified epoxy resin + nano-alumina / boron nitride composite reinforcement," the problem of imbalance between high voltage resistance and aging resistance in existing materials is solved. It exhibits significantly improved dielectric strength, greatly reduced dielectric loss, and excellent high and low temperature cycling performance, meeting the long-life operation requirements of ultra-high voltage equipment.

This invention belongs to the field of laser additive manufacturing technology, specifically relating to a dual-spot parallel scanning additive manufacturing system and method. A laser generation unit dynamically distributes a laser beam to the first and second optical paths according to a preset energy ratio through polarization beam splitting. The spot generation unit uses two spatial light modulators to modulate the two beams into patterned spots and dot spots respectively. The filtering and imaging unit filters and images the two beams. The parallel scanning unit drives the dual spots to scan synchronously on a powder bed. The control unit performs model slicing and patterned region segmentation, and dynamically allocates energy and synchronously controls all units to work together based on the segmentation results. This achieves a single laser, dual optical paths, irregularly shaped spots, and parallel scanning, simultaneously balancing processing efficiency and forming accuracy, effectively solving the technical problem of traditional single-spot methods that struggle to achieve both efficiency and accuracy.

The application relates to the technical field of food packaging materials, and discloses an antibacterial taro silk cake food packaging bag and a preparation method thereof. The antibacterial taro silk cake food packaging bag comprises an inner laminating layer and an outer functional layer. The preparation method of the antibacterial taro silk cake food packaging bag is as follows: prepared inner laminating layer material and outer functional layer material are respectively added into two hoppers of a two-layer co-extrusion blow molding machine, the extrusion temperature of the inner laminating layer is set to 160-180 DEG C, the extrusion temperature of the outer functional layer is set to 180-200 DEG C, the composite film is obtained by blow molding after head compounding, the composite film is cut into the required size, and then heat sealing is carried out under the conditions that the heat sealing temperature is 140-150 DEG C and the heat sealing time is 2-3 seconds to obtain the antibacterial taro silk cake food packaging bag. The antibacterial taro silk cake food packaging bag has good mechanical, barrier and antibacterial properties.

This invention discloses a method for preparing in-plane test specimens of composite materials and its product. The method includes providing a composite prepreg and laying it at a preset lamination angle to form multiple laminated modules; vacuuming each laminated module and then ironing its surface with an electric iron; stacking at least two ironed laminated modules and vacuuming them again to obtain a laminated structure; hot-pressing and curing the laminated structure to form a composite material layer, forming an integral plate; fixing the integral plate to a first PVC pad with a first pressure-sensitive double-sided adhesive to form a cut sample; fixing a second PVC pad to a cutting equipment worktable with a second pressure-sensitive double-sided adhesive; and using a grinding wheel disc cutter to cut and grind the fixed cut sample in an integrated manner to obtain a test specimen, effectively overcoming the drawbacks of traditional integral vacuuming.

The application relates to the technical field of metal additive manufacturing, in particular to an SLM additive manufacturing method and system based on ultrafast laser in-situ assistance and application, which comprises the following steps: a three-dimensional model of a part to be formed is established and slice processing is carried out to generate a scanning path of a main laser; an ultrafast laser is coaxially combined with the main laser, and working parameters of the main laser and the ultrafast laser are set; a layer of metal powder is laid in a forming area, the main laser scans and melts the metal powder according to the scanning path to form a molten pool, and the ultrafast laser acts on the tail of the molten pool or the solidification front of the point after the main laser scans the point at a preset time interval; layer-by-layer processing is carried out until the whole part is manufactured. The ultrafast laser is coaxially integrated with the main laser, and in a preset time interval after the main laser scans a point to melt the metal powder and form a molten pool, the ultrafast laser is used to impact and inject energy into the tail of the molten pool or the solidification front which is advancing, so that grain refinement, defect elimination and stress regulation can be realized, and high-performance metal parts with small and uniform microstructure, few internal defects, low residual stress, excellent mechanical properties and significantly improved isotropy can be prepared.

This invention discloses a preparation process for a high-density tungsten-cobalt cemented carbide, relating to the field of cemented carbide preparation technology. The process includes the following steps: S1: Batching: Tungsten carbide powder, cobalt powder, and a forming agent are precisely weighed according to a preset mass percentage and placed in a high-efficiency mixing device for pre-mixing to ensure that the components are initially and uniformly dispersed, resulting in a stable tungsten-cobalt mixture. This invention employs a multi-stage densification process involving wet ball milling, spray drying, die pressing, and cold isostatic pressing. This not only ensures that the mixture particles are sufficiently refined and uniformly dispersed, producing spherical composite powder with excellent flowability and significantly reducing internal defects in the formed blank, but also further enhances the density and uniformity of the blank through cold isostatic pressing, providing a good foundation for subsequent full densification during sintering, effectively reducing the porosity of the finished alloy and improving the overall structural stability.

This invention provides a copper-phosphorus alloy target and its preparation method. The preparation method includes the following steps: sequentially subjecting a copper-phosphorus alloy billet to hot forging, forging and stretching, a first water cooling treatment, a first heat treatment, rolling, a second heat treatment, and a second water cooling treatment to obtain the copper-phosphorus alloy target; the phosphorus content in the copper-phosphorus alloy billet is 400-500 ppm. The preparation method provided by this invention can reduce internal defects in the copper-phosphorus alloy target, avoid abnormal grain structure, refine internal grains, improve grain uniformity, and thus improve the quality and performance of the copper-phosphorus alloy target.

This application discloses a method for 3D printing aluminum alloy bearing cages, belonging to the field of cage production technology. The method includes the following steps: (1) preparing a matrix powder; (2) pretreating untreated SiC nanoparticles with nickel-phosphorus plating to obtain SiC nanoparticles coated with an average layer thickness of 60-100 nm nickel-phosphorus layer, mixing them evenly with the obtained matrix powder to obtain a powder, and then using laser powder bed 3D printing to perform layer-by-layer printing to obtain a preliminary blank; (3) heat-treating the preliminary blank to obtain the aluminum alloy cage. The aluminum alloy bearing cage prepared by adding SiC nanoparticles and using laser powder bed 3D printing has high hardness and good wear resistance, which not only extends the service life of the cage but also enables rapid short-term production of the cage.

The application relates to the technical field of seamless steel pipe manufacturing, and discloses a seamless steel pipe skew rolling equipment and a process, wherein the seamless steel pipe skew rolling equipment comprises a base and a PLC controller; a skew rolling mechanism, the skew rolling mechanism comprises a driving disc and an annular frame which are respectively fixed on the upper surface of the base, the inner wall of the annular frame is provided with six support frames in a circumferential array, the inner wall of each of the six support frames is rotationally provided with a roller, and the skew rolling mechanism further comprises a driving motor which is arranged on the side of the driving disc and used for driving the six rollers to rotate simultaneously. Through the arrangement of the skew rolling mechanism, the steel billet for manufacturing seamless steel pipes can be processed in a way that the six rollers are used for oblique rolling, the production efficiency of the seamless steel pipes is effectively improved, the energy consumption is reduced, the occurrence of internal defects is reduced, the quality and stability of the products are improved, the production equipment is simplified, and the maintenance cost is reduced.

The application provides a device and method for vacuum-assisted pultrusion of thermoplastic composite rods, and belongs to the field of civil engineering. The device solves the problem of bubbles generated by melt flow of thermoplastic resin, which reduces the forming quality of the thermoplastic composite rod. The device comprises a preheating module for preheating a thermoplastic prepreg tape, a heating module, a cooling module and a vacuum pumping device. The heating module comprises a first heating cavity, a vacuum cavity and a second heating cavity connected in sequence. The vacuum cavity is connected with the vacuum pumping device through a vacuum pumping port. The vacuum cavity adopts a gradient vacuum pumping design. Second heating components are arranged in the first heating cavity, the vacuum cavity and the second heating cavity. The cooling module is connected with the second heating cavity and used for cooling a thermoplastic composite rod product. Conical constraint components are arranged in the first heating cavity, the second heating cavity and the cooling module. The conical constraint components are used for narrowing the transmission path of the thermoplastic prepreg tape in the corresponding module. The device is mainly used for forming the thermoplastic composite rod.

The utility model discloses a high -speed copper cable integration injection moulding frock, include: for fixed installation high -speed copper cable each group wire core's injection assembly still include: for the fixed clamping assembly of high -speed copper cable's each group wire core starting end, the injection assembly includes: the movable connection injection upper cover, injection lower cover, the contact surface of injection lower cover, injection upper cover, respectively be provided with the multiple groups of guide groove group that the each group wire core of high -speed copper cable is defined to, and each guide groove group is comb -tooth shape in space, wherein, injection upper cover is provided with multiple injection port I that communicates with outside injection molding machine, and the middle part of each guide groove group is provided with injection recess in the perpendicular cable direction, and each injection port I and corresponding injection recess are in space intercommunication state. The utility model discloses utilize the comb -tooth guide groove group to ensure that each group wire core spacing is even, and the injection recess that sets up in each guide groove group reduces the overflow risk in the injection process.

The application discloses a manufacturing method of aileron bonding parts in the technical field of aerial unmanned planes, and comprises the following steps: S1, preparing laminated plate parts and edge strip parts; S2, pretreating a bonding tool; S3, pretreating bonding surfaces of the laminated plate parts and the edge strip parts; S4, preparing a honeycomb core and a foam core, laying a rubber film or foaming rubber on a preset bonding surface, positioning a lower skin on the bonding tool, and sequentially assembling a preformed framework to be subjected to pre-foaming treatment. By adopting a carbon fiber composite laminated structure, a composite layout of a foam sandwich and a honeycomb sandwich, and an integrated structure design of a single beam and multiple ribs, the application greatly reduces the number of independent parts and standard parts, significantly reduces the overall weight of the aileron bonding parts, effectively improves the flight maneuvering flexibility and endurance of the unmanned plane, and simultaneously reduces flight energy consumption and manufacturing cost.

This invention discloses a 635MPa grade niobium-vanadium-chromium composite reinforced high-performance steel bar and its smelting method. By controlling the chemical composition and V / N mass ratio of the steel bar within the range of 3.35 to 3.75, and employing a multi-element composite strengthening formula of niobium, vanadium, and chromium to replace the traditional single vanadium-nitrogen alloy addition mode, production costs are reduced. During the smelting process, a dedicated dry powder stirring device is used to pre-mix the microalloying reinforcing agent, achieving uniform mixing of powder components and removal of magnetic impurities. Simultaneously, a composite desulfurizing agent is introduced and a step-by-step addition process is adopted, combined with a gradient ladle bottom-blowing argon stirring system, to effectively reduce the sulfur content in the steel. The steel bar prepared by this invention has a uniform microstructure, high grain size, and excellent mechanical properties such as tensile strength, yield strength, strength-to-yield ratio, and elongation. It exhibits good product consistency, low production costs, and can stably mass-produce high-performance 635MPa grade high-strength earthquake-resistant steel bars.

This invention belongs to the field of thermal barrier coating technology, and particularly relates to a method for preparing an MCrAlY coating. The method first uses a powder metallurgy HY3 target and employs multi-arc ion plating technology to prepare an MCrAlY coating on the surface of a high-temperature alloy. The coating is then subjected to vacuum heat treatment, shot peening, and surface conversion layer treatment. The MCrAlY coating prepared by this method has a uniform microstructure, few internal pores and other defects, and a dense surface conversion layer that forms a diffusion barrier layer. This layer resists oxidation and prevents diffusion between the MCrAlY coating and the Pt layer, enabling the study of MCrAlY underlayers with low infrared emissivity and long-term stability.

The application discloses a conductive wire core aluminum alloy and a manufacturing method and application thereof, relates to the technical field of conductive wire core materials, and comprises the following components by percentage of weight: A 0.003-1.465 wt%, rare earth elements 0.001-7.670 wt%, aluminum 88.005-99.999 wt% and inevitable impurities; the conductive wire core aluminum alloy and the manufacturing method and application thereof precisely control the proportion of iron, copper and magnesium alloy elements, especially control the total content of iron and the mass ratio of copper and magnesium, and combine the grain refining effect of rare earth elements, so that the alloy has high strength and high conductivity, solves the problem that the strength and conductivity of a traditional alloy are restricted by each other, and is suitable for large-scale production.

This invention discloses a low-cost, high-density graphitized carbon block and its preparation process, which is prepared from the following raw materials: sponge coke with a particle size of 6-9 mm; sponge coke with a particle size of <0.5 mm; shot coke with a particle size of 0.5-6 mm; shot coke with a particle size of <0.5 mm; and coal tar pitch. The shot coke is calcined at 1300℃-1500℃ for 1-5 minutes and then at 1900℃-2200℃ for 1-5 minutes before being pulverized. This invention extensively utilizes shot coke, which is not used in the traditional production of graphitized cathode carbon blocks, thus solving the bottleneck in shot coke usage and reducing production costs. It employs an optimal particle size ratio of sponge coke and shot coke, as well as a mixing and molding process; combined with a unique calcination temperature rise curve, it achieves excellent strength, thermal conductivity, resistivity, sodium penetration expansion rate, and yield; making it highly suitable as a cathode material for electrolytic cells and fully meeting the needs of low-cost mass production in industrial applications.

The utility model discloses a ceramic castable forming shaft structure, which relates to the technical field of ceramic castable forming shafts and comprises a shaft body, a central hole is arranged in the middle of the shaft body, and a plurality of mounting holes matched with rod bodies are arranged on the outer surface of the shaft body in a surrounding manner. In order to solve the problems, the utility model provides the ceramic castable forming shaft structure, through the interference fit connection mode of the mounting hole and the shaft body, the tight combination of the rod body and the shaft body is ensured, the stability of the whole device is improved, faults caused by loose connection are reduced, and the service life of the device is prolonged. The spiral structure on the outer surface of the shaft body and the special-shaped mounting hole design facilitate smooth conveying and uniform distribution of materials, so that the forming quality of ceramic products is improved, internal defects and dimensional deviation are reduced, the mechanical property and the heat dissipation performance of the shaft body are optimized on the premise that the strength is not reduced through the design of the supporting plates and the through holes in the shaft body, and the service life of the shaft body is prolonged. The wear resistance is improved, and the service life of the forming shaft is prolonged.