Explosive and powder modeling powder free-running property testing method

Abstract

The invention discloses an explosive and powder modeling powder free-running property testing method. The method is designed to solve the problems that a test on the free-running property of explosive and powder modeling powder in the prior art is not high enough in precision, and the application requirement cannot be met. The explosive and powder modeling powder free-running property testing method is characterized in that a testing device and a sample need to be stored for more than 2 h in the environment of 15 DEG C to 25 DEG C before a test; a funnel inserting plate (2) is inserted to block a funnel flow-out opening; the mass of a weighing standard cup (9) is recorded as m0, a standard cup of explosive and powder modeling powder samples is weighed out and is striken off with a scraper and weighed, total mass is recorded as mt, and therefore the mass of the samples is m=mt-m0. The samples are carefully poured into a funnel (3). The funnel inserting plate (2) is pulled out, and meanwhile timing is started. When the samples exactly flow out of a discharging opening, timing is stopped, consumed time is recorded as t, and the free-running rate of explosives and powders is calculated accordingly. Compared with an existing testing technology, the method is higher in testing precision and can meet the application requirement.

Description

technical field [0001] The invention relates to a method for testing the fluidity of powder, in particular to a method for testing the fluidity of propellant molding powder. technical background [0002] Press-fit molding is an important way of explosive molding, which has many advantages such as high dimensional accuracy, high molding density, and convenient molding. The raw material for press molding is called modeling powder. The fluidity of the molding powder has a crucial impact on the quality of the press-molded product: if the fluidity of the molding powder is too poor, it is difficult to spread evenly in the mold, and the density of the pressed product will be uneven, so the quality of the pressed product is poor ; If the fluidity of the modeling powder is too good, the pressed product will have a lower density and thus lower energy per unit volume. Only the modeling powder with moderate fluidity, the pressed product has a uniform and high density, and the quality ...

AI Technical Summary

Problems solved by technology

[0003] However, as stated in the patent CN200910022917 "Testing Method for Fluidity of Explosives Based on Three-Dimensional Reconstruction", the current means of controlling the fluidity of powders of explosives and explosives mainly depends on the operator's hand feeling and visual inspection, and there is no quantitative method. Therefore, it is easy to cause different operations. The products prepared by personnel are quite different, thus affecting the consistency of products

GB11986-1989 "Measurement of the Angle of Repose of Surfactant Powder and Particles" adopts the angle of repose method to test the fluidity of surfactant particles or powders (for example, patent CN201110329347 "Methods for Improving the Fluidity and Bulk Density of Vitamin A and Vitamin D3 Microcapsules " and patent CN201310061973 " a kind of preparation method of dialkylphosphinate with good fluidity " all adopt this method to control the quality of product), but this method is not quite suitable for propellant fluidity test, because The fluidity of explosive molding powder is much better than that of washing powder and medicine powder. The angle of repose method has a large error, the relative standard deviation is above 5%, and the test precision is low, which cannot meet the convective fluidity test of explosive molding powder. requirements

Images