55results about How to "No cutting" patented technology

The invention belongs to the technical field of aerators, and relates to an impeller aerator provided with a device for preventing hot air from flowing back in a water shield. A motor is arranged in a shell consisting of a conical body and the water shield; a supporting base of the motor is connected with the shell; a motor shaft is connected with an impeller shaft and vertically extends into water downward; a motor body is positioned over the horizontal pane; an isolation device for preventing the hot air of the motor from upward flowing back and entering a fan guard of the motor is arranged between the water shield and the motor so as to ensure that the hot air formed after the heat exchange of a cooling fan and radiating fins is not returned to the fan guard of the motor and the temperature of the motor is greatly reduced; the supporting base is connected with supporting rods; and the other end of each of the supporting rods is provided with a floating body respectively. The complete machine floats on the water surface to work through the floating bodies, and a water body lifted by an impeller is guided to various directions by using the conical body so as to ensure that lower-layer water fills a vacancy, so that the aim of oxygen increase is fulfilled through the convection of the water body. Structures such as gears, reduction gearboxes and the like which are required in the prior art are abandoned, lubricating oil is not required to be filled, the oil leakage is effectively prevented from polluting fishing ponds, and the production cost is reduced.

The invention belongs to the technical field of aerators, and relates to a speed reducing impeller-free aerator. A motor is arranged in a shell consisting of a cone and a waterproof cover; the motor is connected with the shell by a supporting seat; a motor shaft is connected with an impeller shaft and vertically downwards extends to the water; a motor body is positioned above the horizontal plane; an isolating device for preventing hot air of the motor from refluxing to a motor fan cover is arranged between the waterproof cover and the motor, so that the hot air formed after heat exchange of a cooling fan and radiating fins does not reflux to the motor fan cover, and the temperature of the motor is greatly reduced; the supporting seat is connected with supporting rods, and the other ends of the supporting rods are respectively provided with a floating body; and the whole aerator works by means of the floating bodies which float on the water surface, the water stirred up by the impeller is guided around by the cone, so that the water of the lower layer is complemented and the aeration purpose is fulfilled by water convection. According to the aerator, structures such as a gear, a reduction box and the like in the prior art are abandoned, lubricating oil is not needed, a fish pond is effectively prevented from being polluted by leaked oil, and the production cost is reduced.

The invention discloses a method of forming powder metallurgy tool steel. The method includes a first step of conducting carbon-reduction and anneal on water atomization tool steel powder under the vacuum condition, a second step of evenly coating the surface of the powder with a layer of graphitic lubricant assisting in sintering, and obtaining mixed material after paraffins forming agent is mixed in, a third step of manufacturing material blank or part blank by compression moulding forming of the mixed material and dewaxing, and a fourth step of sintering the material blank or the part blank by a vacuum-pressure furnace. The powder metallurgy tool steel (high-speed steel) produced by the method is even and fine in formation, relative density of the tool steel reaches 99.5% and the density is close to be fully compact. Material performance is excellent, the powder metallurgy tool steel is close to isostatic pressing tool steel (high-speed steel) material in physical and mechanical properties, and the method of forming the powder metallurgy tool steel has the advantage of being low in cost, free from cutting, high in efficiency and capable of massively producing parts the same with powder metallurgy.

The invention discloses a method for machining a T-shaped bolt. The method comprises the following steps of: a) casting a T-shaped rod material blank and controlling the weight percentage of all chemical components of the rod material blank to ensure that the rod material blank comprises 0.28 to 0.35 percent of C, 0.25 to 0.35 percent of Mn, 0.05 to 0.09 percent of V, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, 0.55 to 1.20 percent of Ni, 0.35 to 0.45 percent of Co, 0.20 to 0.30 percent of Sb and less than or equal to 0.20 percent of Cu; according to the method for machining the T-shaped bolt, the bolt is machined by a cold extruding process, so that the intensity of the bolt is improved, the hardness value and the intensity value required by a 12.9 high-intensity bolt can be acquired, and the delayed fracture and the fatigue crack of the bolt under high intensity can be avoided; and during use, the bolt is reliable in connection, is not prone to break, and meets the using requirements of all industries in society on the high-intensity bolt; and the service life of the bolt is prolonged.

The invention discloses a method for machining a high-strength double end bolt. The method comprises the following steps of: a, manufacturing a rod blank, and controlling the weight percentage of each chemical component of the rod blank to meet the following requirements: 0.28 to 0.35 percent of C, 0.25 to 0.35 percent of Mn, 0.05 to 0.09 percent of V, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 percent of P, less than or equal to 0.035 percent of S, 0.55 to 1.20 percent of Ni, 0.35 to 0.45 percent of Co, 0.20 to 0.30 percent of Sb and less than or equal to 0.20 percent of Cu; and b, forging a cast rod at the temperature of between 850 and 800 DEG C for not more than 20 times, wherein a thin layer of fly ash is coated on the inner wall of an impression of a forging die; and turning an external thread at each of two ends of the bolt by using a precision lathe after forging. According to the method for machining the high-strength double end bolt, the bolt is machined by adopting a cold extrusion process, so that the strength of the bolt is improved, the hardness value and the strength value required by the 12.9 high-strength bolt are achieved, the problems of delayed fracture and fatigue fracture of the bolt under high strength are solved, the bolt is reliable in connection during use and difficult to break, the service life of the bolt is prolonged, and the using requirement of each industry in the society for the high-strength bolt is met.

The invention discloses a high-strength and soluble metal-based composite material at first. The high-strength and soluble metal-based composite material comprises the following elemental components in percentage by weight of 10-15% of Al, 50-60% of Mg, 25-30% of C and other trace elements and impurities. Meanwhile, the invention further discloses a method for preparing the high-strength and soluble metal-based composite material. The method comprises the steps of preparing materials in a mass ratio of (10 to 15): (50 to 60): (20 to 30): (10 to 20) of an aluminium metal powder to a magnesium metal powder to carbon fibers to additives; mixing the raw materials according to different preparation flows to prepare a slurry; carrying out injection molding on the slurry to obtain a sintered precursor; carrying out liquid medium removal treatment on the sintered precursor; and carrying out sintering molding on the dried sintered precursor to obtain the metal-based magnesium-aluminium composite material. The high-strength and soluble metal-based composite metal material provided by the invention is high in strength and soluble under a specific condition, and has the characteristics of being excellent in comprehensive mechanical performance and the like.