32results about How to "Not prone to shrinkage" patented technology

The invention discloses a production process of high-elongation nodular cast iron being as cast condition. The production process comprises the following steps: sorting; burdening: taking materials by weight percentage as follows: 35-45% of cast iron Z18 or Z22, less than 35% of foundry returns and 30-55% of steel scraps; melting: putting burdened materials into a furnace for melting, melting the materials into molten iron, rising the temperature of the molten iron to be 1600-1650 DEG C, carburetting and complementing silicon; then conducting desulfuration process; complementing oxygen and reducing manganese and conducting dephosphorization process; finally carrying out on-the-spot chemical contents analysis, adjusting the chemical contents, conducting the next operation after the chemical contents are qualified; balling by utilizing pour-over method; and breeding instantly by adopting an inoculant when in casting so as to obtain the high-elongation nodular cast iron being as cast condition. According to the high-elongation nodular cast iron being as cast condition provided by the invention, the cost is lowered, the production period of a cast is shortened; the sorting range of the raw materials of the nodular cast iron is enlarged; the cast can not shrink easily; and the cost is saved, silicon iron alloy does not need to be added or is little added after the casting treatment.

The invention discloses tetrafluoroethylene copolymer resin for coating and a preparation method thereof. The tetrafluoroethylene copolymer resin is prepared from the following components in mol fractions: 40-55mol% of tetrafluoroethylene, 10-44.9mol% of C1-5 vinyl carboxylate, 10-44.9mol% of C9-18 vinyl carboxylate, 5-15mol% of non-carbamido hydroxyl containing monomer, 0.1-2mol% of allyl carbamido monomer, 0-2.5%mol% of carboxylic monomer and 0-10mol% of other monomers, wherein the C1-5 vinyl carboxylate is composed of C1-2 vinyl carboxylate and C4-5 branched vinyl carboxylate of which the mol ratio is 1:(0.1-10). The tetrafluoroethylene copolymer resin for coating disclosed by the invention has a good dispersion wetting property with a pigment, has good consistency with a curing agent and can be dissolved in a pure petroleum based solvent, coating prepared from the tetrafluoroethylene copolymer resin has good weather resistance and solvent resistance and is not easy to produce yellow stain, and the tetrafluoroethylene copolymer resin is not easy to crack or flake when used for surface coating of a fiber substrate.

To provide a hydraulic power generating device capable of preventing rotation vibration and rotation noise when a water turbine for power generation is rotated. In a water turbine 5 for power generation of a hydraulic power generating device, a first blade 571 and second blade 572 are formed in an area adjacent to each other in an axial line direction. The outer peripheral ends of the second blades 572 are coupled by a cylindrical plate 58. Four ejection ports 34 are opened to a direction astride both the first blade 571 and cylindrical plate 58. A part of water ejected through an ejection port 34 directly collides with the first blade 571. The rest continuously collides with the outer end surface of the cylindrical plate 58 from each direction. Thus, aligning action is exerted to the water turbine 5 for power generation. The number of ejection ports 34 and the number of blades 57 are prime to each other. Since timings at which four first blades 571 come nearest to the ejection ports 34 respectively are deviated, water ejected through the ejection port 34 is prevented from intensely colliding with two or more blades 57 at the same time.

The invention belongs to the technical field of precision machining, and discloses a welding forming method for water inlet and outlet flow channels of an outer ring of a heat exchange honeycomb structural part. A workpiece is decomposed into several parts, a fan-shaped groove is machined and formed in the outer ring in a line cutting mode, and then a butt joint oblique joint and a limiting sinking table which are used for brazing are milled on the fan-shaped groove so as to position an insert and increase the brazing area, so that the welding strength is improved; and then the insert, an upper cover plate and a lower cover plate are independently machined. According to the corresponding assembling steps, the insert and the butt joint oblique joint of the fan-shaped groove are welded together through brazing treatment so as to reduce the deformation of large-depth fusion welding; and the upper cover plate, the lower cover plate and an insert boss are welded to the limiting sinking table of the fan-shaped groove through an argon arc welding process. Meanwhile, the welding strength between the fan-shaped groove and the upper cover plate and the welding strength between the fan-shapedgroove and the lower cover plate can be ensured by locally adopting argon arc welding fusion welding. The workpiece can meet the welding strength requirement, in addition, due to the fact that overall slow heating is adopted in the welding process, the thermal deformation of the workpiece is small, and the situation that the workpiece is twisted and deformed is effectively avoided.

The invention discloses a processing technology for a polyester double-layer four-way elastic fabric, and relates to the technical field of fabric processing. The treatment process is based on the blank length of 2000m, including the following steps: Step 1, refining; Step 2, pre-shrinking: the refined blank is placed in a pre-shrinking solution for pre-shrinking treatment for 25-30min, and the pre-shrinking solution The temperature is 80-83°C; Step 3, pre-setting; Step 4, hanging wire; Step 5, weight reduction: reduce the pre-shaped blank in the alkali-water mixture; Step 6, dyeing, washing; Seventh, dehydration, opening width, softness, and setting to obtain polyester double-layer four-way stretch fabric. The invention can make the obtained polyester double-layer four-way stretch fabric have the advantages of soft hand feeling and moderate gram weight, and it is also beneficial to make it have good physical indicators such as good soaping fastness; more importantly, the invention is beneficial to saving Reduce energy consumption and reduce processing costs for polyester double-layer four-way stretch fabrics.

The invention provides an environment-friendly water-based paint and a preparation method thereof. The environment-friendly water-based paint comprises the following components in parts by weight: 15-25 parts of water, 10-20 parts of hydroxy acrylic resin, 7-12 parts of organic silicon modified polysiloxane emulsion, 10-15 parts of pigment, 5-7 parts of a dispersing agent, 2-4 parts of a de-foaming agent and 1-3 parts of a flatting agent. The preparation method comprises the following steps: adding water, hydroxy acrylic resin and organic silicon modified polysiloxane emulsion into a stirrer and stirring, thereby acquiring a mixed solution; adding pigment and the dispersing agent into the mixed solution in turn, and continuing to stir, thereby acquiring a mixed slurry; grinding the slurrytill the fineness of the mixed slurry is controlled within 20-30mum, thereby acquiring a ground material; putting the ground material into a paint mixing tank, adding the de-foaming agent and the flatting agent in turn, and stirring, thereby acquiring the environment-friendly water-based paint. The environment-friendly water-based paint provided by the invention has the advantages that the surfacetension of the water-based paint in water is greatly reduced, the adhesive force of water-based paint coating to the substrate is enhanced, shrinking cavities are difficult to form on the coating, the surface evenness of the coating is improved and the stain resistance of the coating is greatly enhanced.

The application discloses a UV-curable vacuum coating wrinkle primer and a preparation method thereof, which comprises the following components in parts by weight: 15-25 parts of bisphenol A epoxy acrylate; 8-12 parts of aliphatic polyurethane diacrylate 6-13 parts of tripropylene glycol diacrylate; 10-18 parts of trimethylolpropane triacrylate; 4-8 parts of acrylic modified alkyd resin; 2-5 parts of photoinitiator; 0.08-0.2 parts of leveling agent parts; solvent 45 to 55 parts. Through the reasonable matching of various components, the cured coating can take into account the advantages of ordinary UV paint such as energy saving, environmental protection, high efficiency, and economy, and has low curing energy and good wrinkle decoration effect.

The invention discloses high-quality gray pig iron for an automobile flywheel shell, and relates to cast iron. The high-quality gray pig iron comprises, by weight percent, 3.1% to 3.5% of carbon, 1.7% to 2.0% of silicon, 0.9% to 1.2% of manganese, 0.02% to 0.04% of phosphorus, 0.03% to 0.06% of sulphur, 0.03% to 0.05% of magnesium, 0.02% to 0.04% of strontium, 0.05% to 0.1% of vanadium, 0.1% to 0.2% of titanium, 0.3% to 0.5% of copper, 0.1% to 0.15% of chromium, 0.2% to 0.3% of mixed rare earth and the balance iron. The prepared high-quality gray pig iron has the higher strength, hardness and corrosion resistance, and is good in machining characteristic; during casting, shrinkage holes are not prone to generating, the obtained yield is high, the manufactured flywheel shell is good in vibration and acoustic characteristics, and the service life is longer.

The invention discloses a bottom plate of an improved table tennis racket and the table tennis racket thereof, wherein the bottom plate of the improved table tennis racket adopts a special material so that the table tennis racket has impact resistance, aging resistance and good rigidity; the bottom plate of the improved table tennis racket adopts fish The bone-shaped structure realizes the hollow part of the bottom plate of the racket, which reduces the overall weight of the table tennis racket; the elastic panel and the bottom plate of the table tennis racket are provided with a number of concave holes evenly arranged. It is to improve the friction and rotation speed generated by the racket on the table tennis ball when the table tennis ball is hit.

The invention discloses a tetrafluoroethylene copolymer resin for coatings and a preparation method thereof. The resin comprises: 40-55mol% of tetrafluoroethylene, C 1～5 Carboxylic acid vinyl ester 10 ~ 44.9mol%, C 9～18 Carboxylic acid vinyl ester 10-44.9mol%, non-urea group hydroxyl-containing monomer 5-15mol%, allyl urea-based monomer 0.1-2mol%, carboxylic acid monomer 0-2.5mol%, other monomers 0-2 10mol%, C 1～5 The vinyl carboxylate is composed of C 1～2 vinyl carboxylate and C 4～5 It is composed of branched chain carboxylate vinyl ester, and the molar ratio of the two is 1:0.1~10. The tetrafluoroethylene copolymer resin for coatings of the present invention has good dispersion and wettability with pigments, good compatibility with curing agents, can be dissolved in pure petroleum solvents, and the coatings prepared by tetrafluoroethylene copolymer resins have good weather resistance and solvent resistance. It has excellent properties and is not easy to produce yellowing. When tetrafluoroethylene copolymer resin is used for the surface coating of fiber substrates, it is not easy to crack and peel off.

The invention belongs to the technical field of precision machining, and discloses a welding and forming method for the inlet and outlet water channels of the outer ring of the heat exchange honeycomb structure. The butt joint and limit sinking are used for brazing to position the insert and increase the brazing area, thereby improving the welding strength; then the insert, upper cover and lower cover are processed separately. According to the corresponding assembly steps, brazing is used to weld the insert and the fan-shaped groove butt joint to reduce the deformation of large-depth welding; the upper cover, the lower cover and the insert are convexly welded by argon arc welding. The platform is welded to the limit sunken platform of the fan-shaped groove. At the same time, partial welding with argon arc welding can ensure the welding strength between the fan-shaped groove and the upper and lower cover plates. Not only can the workpiece meet the welding strength requirements, but also the thermal deformation of the workpiece is small due to the slow heating of the whole during the welding process, effectively avoiding the distortion and deformation of the workpiece.

The invention discloses an easily processed silicon brass alloy. The alloy comprises the following components in percentage by weight: 60-63% of copper (Cu), 0.50-0.90% of silicon (Si), 0.50-0.80% of aluminum (Al), 0.10-0.20% of lead (Pb), less than 0.3% of other elements, and the balance of zinc (Zn) and inevitable impurities, wherein the sum of copper, silicon, aluminum and zinc is more than 99.60%, and other elements are a combination of tin (Sn), manganese (Mn), ferrum (Fe) and nickel (Ni). The invention further comprises a preparation method of the silicon brass alloy. The prepared silicon brass alloy is obviously higher than common lead brass in the performances of tensile strength, elongation rate, hardness and anti-zinc removal, the casting processability is good, practical production and application demands can be met, the precipitation of metals can meet the standard requirements, and the easily processed silicon brass alloy can be widely applied to water heating, valves and other various industries having limit on the precipitation of metal pollutants.