A Calculation Method of Process Parameters of Compression and Stretching of Propellant

Abstract

The invention discloses a method for calculating the technical parameters of a propellant powder pressure extension, which can carry out calculations for new propellant formulations without relying on empirical data and manual experience, and provides a relatively suitable pressure extension range. According to the method, the Rheological property of the propellant powder material is adopted to carry out tests, a constitutive equation of the propellant powder material is further obtained, suitable parameters of the equation after fitting are obtained, and a model of the propellant powder pressure extension is established; the pressure extension process of the propellant powder can be better described by the constitutive equation based on the performance of the propellant powder material, and for new propellant formulation, relatively good process parameters can also be obtained without empirical data and manual experience. By using the three-dimensional model and the finite element analysis method, the pressure range of the suitable propellant pressing process parameters can be obtained, a relatively suitable pressure range for the technical parameters of propellant powder pressure extension and a suitable pressure range for the technical parameters of the pressure extension can be obtained, it is ensured that the pressure is not exceeded at a medicine discharge mouth in the pressure extension process, and the risk of combustion explosion is avoided.

Description

technical field [0001] The invention relates to a method for calculating process parameters of compression and stretching of propellant, which is suitable for calculating process parameters of compression and stretching process in the manufacturing process of propellant products. Background technique [0002] The process of propellant product preparation includes absorption, water displacement, granulation, gelatinization, compression stretching, drying, etc. Among them, the compression stretching process is the forming process of propellant powder, and the dimensional accuracy, compactness, and surface gloss of propellant powder are uniform. It is determined by the quality of the compression-stretching process, and the core of the compression-stretching process is the design of the compression-stretching process parameters. Under certain mold conditions, the ideal propellant product can be obtained through appropriate process parameters. The existing propellant compression ...

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Problems solved by technology

The following problems exist in the existing calculation method of propellant compression-stretching process parameters: (1) The calculation process needs to rely on the existing test data and correct it through manual experience, and the results obtained by experienced personnel and inexperienced personnel are quite different; (2) For the new formula, more suitable process parameters cannot be given, and it is necessary to gradually increase the pressure from a lower pressure, which takes a long time and wastes more medicinal materials when finding a suitable pressure; (3) due to the During the compression and stretching process of the material, the pressure transmission is related to the amount of the material, and the pressure at the drug outlet has a certain delay. Therefore, under the premise that a certain pressure range is not given, the continuous rise of the pressure will lead to a sudden increase in the outlet pressure. Large, resulting in a greater security risk

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