7results about How to "Control cooling rate" patented technology

The application discloses a method for integrally injection-molding a metal small shaft and a composite small blade, extending an easy-to-break tail section of the same material from a non-injection-molding end of the metal small shaft, processing a notch and a plane on the surface of the injection-molding end of the metal small shaft, placing a tooling on the outside of a mold cavity of an injection-molding mold and corresponding to the position of the metal small shaft, adjusting the clamping position of the metal small shaft on the tooling, starting injection molding, keeping the tooling clamping the tail section of the metal small shaft during the injection molding, and removing the tail section after the injection molding. The method accurately integrally injection-molds one end of the metal small shaft and an end of the composite small blade, ensures that the length direction of the metal small shaft exposed from the end of the composite small blade meets the specified length, and ensures that the metal small shaft does not rotate in the composite small blade or is not separated from the composite small blade due to loosening of the joint position during use, so that the metal small shaft and the composite small blade form an integrated louver blade.

The utility model provides a bar cooling bed heat preservation cover widening device which comprises an extending suspension beam and a widening heat preservation structure, and the widening heat preservation structure is connected to the end portion of one end of the extending suspension beam through a movable joint assembly. The end, away from the widened heat preservation structure, of the extending suspension beam is connected with an original heat preservation cover main beam of the cooling bed. The fixed end of the movable joint assembly is fixedly connected with the extending suspension beam, the movable end of the movable joint assembly is fixedly connected with the widened heat preservation structure, and the movable end of the movable joint assembly can rotate relative to the fixed end, so that the covering face of the widened heat preservation structure is always kept or approximately in a horizontal state. The heat preservation range of the cooling bed can be effectively enlarged, the cooling speed of bars on the cooling bed can be conveniently controlled, and the performance of the bars can be optimized.

The application belongs to the technical field of laser additive manufacturing, and particularly relates to an array type laser additive manufacturing method and device, which comprises the following steps: S1, digital model import and layering slicing; S2, scanning path planning and filling setting; S3, array type laser synchronous output control; S4, powder flow and powder feeding path control; S5, according to the width of the additive, the width of single track cladding is adjusted in real time; S6, according to the slice layer material of the additive, the matching material is delivered; S7, S1-S6 are repeated, and layer-by-layer accumulation is performed until the part manufacturing is completed. The application can accurately control the grain size, improve the material microstructure, and improve the mechanical properties; the generation of defects such as thermal cracks and pores is reduced, the stability of the deposition process is ensured; the interlayer bonding is optimized, the quality of multi-layer deposition is ensured; the residual stress is reduced, the size precision, shape stability and fatigue performance of the part are improved; the post-processing requirement is reduced, and the processing cost is reduced.

The utility model belongs to the technical field of polyethylene antibacterial film production, and discloses a blowing traction device for polyethylene antibacterial film production, which comprises a die head, an air ring arranged above the die head, a herringbone plate arranged above the air ring, a traction component arranged on one side of the herringbone plate, a plurality of annular air pipes arranged at equal intervals up and down, and a plurality of air pipes arranged at equal intervals up and down, a plurality of uniformly distributed adjustable air outlets are formed in the annular air pipe, the annular air pipe is connected with an air guide branch pipe, an air volume control valve is arranged on the air guide branch pipe, the air guide branch pipe is connected with an air guide main pipe, one end of the air guide main pipe is connected with a fan, an inlet of the fan is connected with a filter, the air ring is designed into multiple layers, and the air volume and the air direction of each layer can be independently controlled; by optimizing the distribution and action of each layer of wind, the cooling speed and shape of the film bubbles can be better controlled, and the transparency and mechanical property of the film are improved.

The invention discloses a liquid cooling driving pump body investment casting process which comprises the following steps: firstly, according to the size and the shape of a pump body, manufacturing a mold with a cavity consistent with the pump body and a loose piece for forming a complex inner cavity structure of the pump body, then injecting wax, molding a wax mold in the mold cavity by adopting a one-time mold splitting molding process, according to the pump body complex inner cavity wax mold, loose pieces are mutually positioned, combined and formed, then wax injection mold splitting is carried out to obtain a wax body, the wax body is connected to a mold head through a pouring gate system to form a tree group, then shell making and dewaxing are carried out on the tree group to form a mold shell, and then roasting, smelting pouring and post-treatment are carried out on the mold shell to form a casting. And the casting is further machined through overhauling, heat treatment, shaping and finish machining, and finally the qualified pump body is obtained if the casting is detected to be correct. Through one-time mold splitting of the wax piece with the complex structure in the inner cavity of the pump body, the mold splitting efficiency is improved, the cost is reduced, meanwhile, the pump body casting is corrected by adopting a one-time composite sizing mold after being subjected to smelting pouring, orderly cooling solidification and heat treatment, and the leakage risk of the pump body casting is greatly reduced.

The utility model relates to the technical field of PGA material film blowing adjusting air rings, and discloses a PGA degradable material film blowing adjusting air ring which comprises a ring body, a base, an air inlet pipe, an adjusting screw, an adjusting groove, a first air opening, a second air opening, an air opening air inlet hole and a third air opening, and is characterized in that the bottom of the ring body is fixed through the base, and the air inlet pipe is arranged on the side face of the ring body; the ring body is internally provided with a rotary air inlet groove, a turn-over wall labyrinth air duct formed by a turn-over wall I and a turn-over wall II, and an air duct I, an air duct II and an air duct III which are separated by the turn-over wall labyrinth air duct; and a plurality of air outlets are formed below the ring body. According to the film bubble cooling device, the side air inlet rotating structure is matched with the wall-turning labyrinth air channel, so that external air forms rotating airflow and is uniformly dispersed to the air outlets, the cooling speed of different areas of film bubbles is effectively controlled, the problem of thickness errors caused by non-uniform cooling in the film blowing process of PGA materials is solved, and the accurate adjustment of the thickness of the film bubbles is realized.

This invention provides a high-performance copper-phosphorus alloy based on grain optimization and its preparation method. The copper-phosphorus alloy comprises the following components in the indicated mass percentages: Cu 75%-85%, P 10%-15%, Al 2%-5%, Ti 1%-3%, rare earth elements 0.1%-0.5%, and the remainder being Fe; the rare earth elements are one or more combinations of cerium, lanthanum, and dysprosium. The preparation method includes batching, smelting, preliminary cooling, casting and rolling, rapid cooling, heat treatment, machining, and surface treatment. The copper-phosphorus alloy of this invention achieves high performance through grain optimization and is suitable for industrial applications requiring high strength, high hardness, and good plasticity and toughness.