Vacuum metering casting device

Abstract

The invention discloses a vacuum metering casting device. The vacuum metering casting device comprises a casting tank and a casting mechanism, the casting tank is a cylinder with the periphery sealed and an inner cavity vacuum, an inner cavity of the casting tank is provided with a space for containing an engine, and the upper surface of the casting tank is provided with a casting gate communicated with the inner cavity of the casting tank; the casting mechanism comprises a casting hopper, a casting pipe and a casting valve, the casting hopper is a cylinder with two open ends, the casting pipe is coaxially arranged below the casting hopper, the lower port of the casting hopper coincides with the upper port of the casting pipe, the casting pipe is matched with the casting gate in structure, the casting pipe is in communication with the inner cavity of the casting tank body through the casting gate, and the casting valve is arranged on the casting pipe; the casting mechanism further comprises an ultrasonic vibration unit arranged on the outer side wall of the casting hopper. Through reasonable arrangement of component structures, the ultrasonic vibration unit generates ultrasonic vibration on the casting hopper, wall hanging of slurry on the inner wall of the casting hopper is reduced, the operation safety is improved, meanwhile, the thermal effect generated by ultrasonic vibration can heat the slurry, the casting device is simplified, and the safety is improved.

Description

technical field [0001] The invention belongs to the technical field of vacuum casting, and in particular relates to a vacuum metering casting device. Background technique [0002] Vacuum casting process is one of the most important molding processes for composite propellants. Through vacuum casting, the air bubbles inside the slurry can be removed, and the combustion stability of the propellant and the safety of the engine can be improved. At present, the most important process equipment of the vacuum casting process is a vacuum casting tank with a hot water insulation jacket, a cylindrical cavity inside, a cover on the top, and a hot water circulation system and a vacuum system. [0003] At present, the interior of the domestic vacuum casting tank is a cylindrical cavity, and it is equipped with some internal height-adjusting lifting platforms. For the casting of multiple engine charges, a single casting port is generally used. After the casting is completed, the casting i...

AI Technical Summary

Problems solved by technology

The existing problems of this casting method are: (1) Circulating vacuum release, moving the engine, and vacuuming not only wastes time, but also causes the rheological properties of the propellant slurry to deteriorate in the later stage, and pores are prone to appear, which affects the reliability of the charging process ; (2) There is no accurate judgment method for the casting end point, and accurate metering and casting cannot be realized

This process requires a secondary hopper for degassing, which not only complicates the installation, but also brings inconvenience to the later slurry cleaning, especially the large number of pipelines and feeding hose valves, which are dangerous links in cleaning because of the friction of the composite propellant The impact sensitivity is high, and the cleaning of the tooling is the most dangerous process step after the casting is completed; the end of the casting is judged by the overflow of the slurry from the vent hole of the casting system. This process system is suitable for large charges. Small charge, such as kilogram-level charge, or for engines with multiple charge structures, has relatively large limitations. This secondary hopper and its supporting casting pipe valve, feeding pipe, and hopper heating circulation system , resulting in very complicated tooling for the vacuum casting system; during the feeding process of the hopper, if the apparent viscosity of the propellant slurry is high, the slurry is also prone to obvious wall hanging phenomenon, which requires on-site operators to manually scrape the material

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