The invention discloses a device capable of improving the bonding strength of a spray-formed composite pipe blank. The device comprises a smelting furnace with the temperature measuring function, a tundish mechanism and an atomizing chamber, the smelting furnace heats and smelts a composite mother alloy inside the smelting furnace into composite mother alloy steel flow, the composite mother alloysteel flow is sent into the atomizing chamber through the tundish mechanism after the temperature requirement is met, inert gas is introduced into the atomizing chamber so that the non-oxidizing atmosphere can be kept in the furnace, an air suction device which sucks air in the atomizing process is arranged at the lower part of the atomizing chamber; a baffle mechanism is arranged below an atomizing nozzle of the tundish mechanism; the atomizing nozzle is started at the initial stage; when the composite mother alloy steel flow is poured into the tundish mechanism, the baffle mechanism is started at the same time to enable the baffle mechanism to move to the position below the atomizing nozzle so as to shield purging of atomized high-pressure gas; when metal liquid drops are sprayed, the return time of the baffle mechanism is set according to the casting temperature and the flow rate of the types of steel so that a base body pipe blank positioned below the baffle plate mechanism can beprevented from making contact with the initial low-temperature metal liquid drops, the temperature of the sprayed metal liquid drops can be uniform, and the bonding force between the atomized metal and the matrix pipe blank can be improved.

Device and method capable of improving bonding strength of spray-formed composite pipe blank

The invention discloses a multi-nozzle injection composite roll facility and method. The facility comprises a tundish, a plurality of nozzles, a rack and a friction heating device. A stirring device is arranged in the tundish. The nozzles are arranged below the tundish and connected with the tundish through liquid guiding pipes. The rack is arranged below the nozzles and provided with a lifting mechanism for driving a blank to move up and down and a rotation mechanism for driving the blank to swing or rotate. The friction heating device is arranged towards the blank and can selectively get close to the blank or get away from the blank. The multi-nozzle injection composite roll device is further included. By means of the multi-nozzle injection composite roll facility and method, the composite layer compounding speed can be rapidly increased, uniform metallurgy bonding is formed, and the bonding force between the blank and a composite layer is high and stable.

Multi-nozzle injection composite roll facility and method

The invention discloses a method for preparing a composite tube blank continuously by spray forming. The method comprises the following steps: allowing a molten metal to flow through a liquid guide pipe at the bottom of a tundish to an atomizing nozzle, atomizing the molten metal by a high-pressure high-speed inert gas in the atomizing nozzle into fine particles to form an atomized cone, depositing the atomized particles on a tube blank basal body below, driving the tube blank basal body to move forwards by a rotary tube blank supporting mechanism which is horizontally arranged, after depositing the tube blank completely, driving by the tube blank supporting mechanism to slowly moving out of the equipment, enabling the follow-up tube blank to follow in order to perform continuous production, and at last forming the composite tube blank. The method disclosed by the invention is simple in process, adopts simple equipment, and facilitates continuous production; in addition, requirements on the inner layer basal body tube blank material are low; the tube blank crystal on a spraying layer is fine and small, and is uniform in structure; the method can greatly improve the performance of the composite tube blank, and can be applied under a severe environment; in particular, the tube blank is free of length limitation.

Method for preparing composite tube blank continuously by spray forming

The invention discloses a spray forming pouring method. A pouring pipe is arranged in a tundish and is provided with taper; the lower part of the pouring pipe is inserted into a drainage pipe; the pouring pipe is a refractory material piece; high-temperature molten steel is injected into the tundish and flows to the drainage pipe along the bottom of an inner cavity of the tundish; because the pouring pipe is inserted above the drainage pipe, the molten steel is accumulated in a cavity between the pouring pipe and the drainage pipe; initial stream of the molten steel is accumulated in the cavity and is preheated in the drainage pipe, and the initial molten steel is subjected to temperature compensation through the subsequent molten steel, so that the overall temperature of the molten steel is raised, the molten steel is accumulated, and the impact strength in the injection process is relieved; and therefore, steel slag generated by turbulence flow is mixed inside the tundish and upwards floats, after the liquid level height of the accumulated molten steel exceeds the pouring pipe, the molten steel uniformly flows into the pouring pipe through an orifice above the pouring pipe, is drained to the drainage pipe from the pouring pipe, and finally flows out of the drainage pipe.

Jin Lei

Papers

Method for preparing composite tube blank continuously by spray forming

Spray forming pouring method