37results about How to "Raw material requirements are low" patented technology

The invention discloses an antiwear close-packed armor roll surface, and belongs to the field of roller presses (high-pressure roller mills). The antiwear close-packed armor roll surface comprises a roll surface base body and an antiwear armor layer, wherein the antiwear armor layer is fixed on the roll surface base body and is composed of a plurality of armor units which are tightly arranged and are fixed on the roll surface base body through bolts; and each overall armor unit is a cone body and is composed of a regular hexagonal prism body on the upper part and a cone body on the lower part. The roll surface base body disclosed by the invention is not easy to wear; the demands on the materials and the processing equipments of the roll surface base body are reduced; the fabrication cost is reduced; the roll surface disclosed by the invention is good in wear resistance and long in service life; and a surface wear-resisting layer is not easy to wear, can be used at relatively high temperature and is easy to assemble and disassemble.

The invention proposes a thermal-cracking-resistant Al-Cu series cast aluminum alloy and a preparation method thereof, aiming at the problem of hot cracking of Al-Cu-based cast aluminum alloys with high copper content, by adding various strengthening elements and inhibiting elements, the strength of the material is improved. Increase the elongation and reduce the solidification temperature range during the pouring process, while increasing the grain boundary dragging effect. The percentages of each component and weight in Al-Cu cast aluminum alloy are: Cu: 4%-6%, Mn: 0.7%-1.5%, Ti: 0.1%-0.4%, B: 0.005%-0.06%, V : 0.005% to 0.030%, the balance being Al. By increasing the content ratio of Mn element in Al-Cu-based casting alloy, the dispersed particles of MnAl16 compound are formed and distributed along the grain boundary, which hinders the growth of recrystallized grains; at the same time, iron impurities are melted to form (Fe, Mn)Al16 compound, reducing Harmful effects of small iron. Significantly improved the hot cracking resistance and elongation of Al-Cu series casting alloy.

The present invention proposes an Al-Cu series casting alloy suitable for forging processing and a preparation method thereof. Aiming at the problem that the Al-Cu series casting alloy with high copper content is difficult to forge, the pouring process is shortened by adding various strengthening elements and inhibiting elements Medium solidification temperature range and increase the grain boundary dragging effect, reduce the generation of dendrites, etc., to achieve the effect of enhancing the forging performance of the material. The percentages of each component and weight in Al-Cu series casting alloy are: Cu: 4%~6%, Mn: 0.5%~1.0%, Si: 0.4%~0.8%, Mg: 0.3%~0.6%, Ti: 0.15% to 0.4%, the remaining impurities <0.5%, and the balance is aluminum. By increasing the content ratio of Mn element and Si element in Al-Cu-based casting alloys, the Si phase is refined and dispersed and the second phase particles (Al 2 Cu, ALCuFeMn compound equal) a large number of dispersed precipitation, the pinning effect is strengthened, which significantly improves the forging performance of Al-Cu series casting alloys. The mechanical properties after forging are tensile strength ≥ 500MPa, yield strength ≥ 350MPa, and elongation ≥ 15%.

The invention discloses a cationic polymer and a preparation method thereof, belonging to the technical field of water-soluble polymer preparation. The preparation method is as follows: add dimethyl diallyl ammonium chloride monomer into the reaction kettle, add viscosity regulator, metal ion chelating agent, chain transfer agent and deionized water under stirring to form a polymerization solution, and pass it into Nitrogen to drive out the air; raise the temperature to 75-95°C, start dropping the initiator and dimethyl diallyl ammonium chloride monomer at a predetermined rate for 2-4 hours; add the curing agent dropwise at 75-105°C, and mature for 1 After ~3 hours, dilute with water to obtain the target product. The invention adds a viscosity regulator to the reaction system to keep the product in a fluid state when polymerized to a relatively high molecular weight, which facilitates the dispersion of initiators and curing agents and the diffusion of free radicals, and improves the efficiency and effect of residue removal.

The invention relates to an etching technology and provides a film covering method of metal strip for etching, an etching method and film covering equipment. The film covering method comprises steps of film covering, first die cutting, first demoulding, second film covering, second die cutting, third film covering, fourth film covering and second demoulding. The film covering equipment comprises a first film covering device, a first die cutting device, a first demoulding device, a second film covering device, a second die cutting device, a third film covering device, a fourth film covering device and a second demoulding device sequentially arranged and enabling metal strip to continuously move. According to the invention, the following steps are finished in sequence: the metal strip is coated with an adhesive film, the adhesive film on an etching area of the metal strip can be mechanically removed, a non-etching area is protected, and the etching area is in direct contact with etching liquid, so that labor force is saved, the processing cycle is shortened, proportion of a chemical reagent is reduced, requirements for the environment and the raw material are lowered, reliability of the non-etching area is improved, and the production efficiency is greatly improved.

The invention provides a 3D printing method for selective laser solidification of metal, which belongs to the technical field of 3D printing forming. Firstly, the metal powder is mixed with the liquid photosensitive resin, and then a dispersant is added to the slurry to adjust the rheological properties of the slurry to prepare a photosensitive slurry with an appropriate solid phase volume fraction and good rheological properties. The 3D printing device is used to extrude the slurry from a nozzle with a certain diameter; at the same time, in the process of slurry streamline extrusion, dispersion and accumulation, a fine laser beam selection is used to scan synchronously on the slurry streamline plane, making it Partial rapid solidification forming, reciprocating, so that the forming of metal parts of a certain shape can be realized. The invention can directly form high-precision metal parts, has high forming speed, high part strength, uniform density, low cost and no special requirements on working environment.