CN107491614B - Method for calculating parameters of propellant powder compression and extension process - Google Patents
Method for calculating parameters of propellant powder compression and extension process Download PDFInfo
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- CN107491614B CN107491614B CN201710729101.6A CN201710729101A CN107491614B CN 107491614 B CN107491614 B CN 107491614B CN 201710729101 A CN201710729101 A CN 201710729101A CN 107491614 B CN107491614 B CN 107491614B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
Abstract
The invention discloses a method for calculating the pressure-extension technological parameters of propellant powder, which can calculate a new propellant powder formula without depending on empirical data and artificial experience and provide a proper pressure-extension pressure range. The invention adopts the rheological property test of the propellant powder and the medicine material to further obtain the constitutive equation of the propellant powder and fit to obtain more appropriate equation parameters, establishes a model of propellant powder compression and extension, can better describe the compression and extension process of the propellant powder based on the constitutive equation of the propellant powder and the medicine material property, and can obtain better process parameters without experience data and manual experience for a new propellant powder formula. By adopting the three-dimensional model and the finite element analysis method, a more proper pressure range of the propellant powder pressure-extension process parameter and a proper pressure range of the pressure-extension process parameter can be obtained, so that the pressure of the propellant powder outlet in the pressure-extension process is ensured not to exceed, and the risk of combustion and explosion is avoided.
Description
Technical Field
The invention relates to a method for calculating parameters of a propellant powder pressing and stretching process, which is suitable for calculating the parameters of the pressing and stretching process in the manufacturing process of propellant powder products.
Background
The preparation process of the propellant powder product comprises the steps of absorption, water expelling, granulation, gelatinization, compression, stretching, drying and the like, wherein the compression and stretching process is a propellant powder forming process, the size precision, compactness, surface gloss and the like of the propellant powder are determined by the quality of the compression and stretching process, the core of the compression and stretching process is the design of compression and stretching process parameters, and an ideal propellant powder product can be obtained through proper process parameters under certain conditions of a mold. The existing propellant powder pressure-stretching process parameters are mainly obtained by empirical data through manual inference, if three-base propellant powder is prepared, the three-base propellant powder needs to be adjusted according to the previous test data, if no test data exists, the pressure needs to be gradually adjusted upwards from the minimum pressure-stretching pressure, and the pressure stretching is carried out until the pressure-stretching pressure which is considered to be proper is obtained. The existing method for calculating the parameters of the propellant powder compression and extension process has the following problems: the calculation process needs to be corrected through manual experience by depending on the existing test data, and the results obtained by people with abundant experience and inexperienced people are greatly different; (II) as for the new formula, proper technological parameters cannot be given, the pressure needs to be gradually increased from low pressure, the required time is long, and more medicine materials are wasted when proper pressure is found; and (III) because the pressure transmission of the medicine is related to the quantity of the medicine in the pressing and stretching process, the pressure of the medicine outlet has certain delay, and the pressure is increased suddenly on the premise of not giving a certain pressure range, so that a larger safety risk is generated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for calculating the propellant powder compression and extension process parameters, which can calculate a new propellant powder formula without depending on empirical data and manual experience and provide a proper compression and extension pressure range.
The invention provides a method for calculating parameters of a propellant powder compression and extension process, which comprises the following steps:
(1) kneading the propellant powder formula materials;
(2) testing the rheological property of the medicine material by using a capillary rheometer;
(3) selecting different constitutive equations, and fitting equation parameters;
(4) selecting a constitutive equation with a larger fitting degree as a standby equation, wherein the fitting degree is at least greater than 0.9, and otherwise, supplementing test points;
(5) establishing a three-dimensional model of the medicine cylinder and the punch by adopting modeling software;
(6) performing logical operation of a geometric body on the three-dimensional model to obtain a three-dimensional model of the medicine;
(7) calculating and solving the three-dimensional model of the medicine material in a pressing and stretching process by adopting a finite element analysis method to obtain the results of pressing and stretching pressure, medicine discharging speed of the medicine material and diameter of the medicine strip;
(8) monitoring the relation between the diameter of the medicine strip and the target diameter in real time, and if the error requirement is not met, adjusting the pressure and stretching pressure to carry out the previous step;
(10) the compression and extension pressure range of the propellant powder is obtained.
Therefore, the method for testing the rheological property of the propellant powder material, solving the three-dimensional model and finite element analysis and comparing the real-time measurement result of the pressure-extension process parameter with the target value is adopted, so that the calculation of a new propellant powder formula can be realized without depending on empirical data and artificial experience, and a calculation method of the propellant powder pressure-extension process parameter within a proper pressure-extension pressure range is provided.
The invention has the following advantages.
And (I) testing the rheological property of the propellant powder and the explosive material to obtain a constitutive equation of the propellant powder and the explosive material, fitting to obtain more appropriate equation parameters, and establishing a model of propellant powder pressure and elongation. Compared with the prior art, the constitutive equation based on the properties of the propellant powder can better describe the pressing and stretching process of the propellant powder, and for a new propellant powder formula, better process parameters can be obtained without empirical data and manual experience.
And (II) a three-dimensional model and a finite element analysis method are adopted, so that a pressure range of the proper propellant powder compression and extension process parameters can be obtained. Compared with the prior art, the proper pressure range of the pressure stretching process parameters ensures that the pressure of the medicine outlet in the pressure stretching process is not over, and avoids the risk of combustion and explosion.
And thirdly, the pressure and elongation pressure can be continuously adjusted by adopting a method for comparing the real-time measurement result of the pressure and elongation process parameters with the target value. Compared with the prior art, can obtain suitable pressure in a short time, shorten development time, reduce the material waste.
Drawings
FIG. 1 is a schematic diagram of the calculation steps of the parameters of the propellant powder compression and extension process.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
According to the figure 1, taking the three-base propellant as an example, the nitrogen content of the nitrocotton is 12.8 percent, the RDX is 5 types, the solvent ratio is 0.27, and the calculation steps of the pressure-extension process parameters of the propellant are as follows.
(1) Weighing the required raw materials, and kneading the raw materials for later use;
(2) a small amount of the medicine materials are taken by a heat preservation device, and the rheological property of the medicine materials is tested by a capillary rheometer, wherein the data is as follows:
(3) fitting is carried out by adopting a modified Bingham model and a Power model, wherein the degree of fitting is 0.98, and the degree of fitting is more than 0.99;
(4) selecting a constitutive equation with a larger fitting degree as a standby equation (the fitting degree is at least larger than 0.9), and selecting a Power model (the fitting degree is more than 0.99);
(5) adopting UG software to establish a three-dimensional model of the medicine cylinder and the punch;
(6) carrying out 'NOT' operation of a geometric body on the three-dimensional model so as to obtain a three-dimensional model of the medicine;
(7) calculating and solving the three-dimensional model of the medicine material in a compression and extension process by adopting finite element analysis software ployflow;
(8) the result is that when the pressure and extension pressure is 10MPa, the medicine discharging speed is 25mm/s, and the diameter of the medicine strip is 18 mm;
(9) the target diameter is 19 +/-0.1 mm, and if the target diameter exceeds the error range, the step 7 is returned to for calculation;
(10) when the pressure and elongation pressure is calculated to be 12MPa, the medicine discharging speed is 30mm/s, the diameter of the medicine strip is 19mm, and the error requirement is met;
(11) the pressure-extension pressure range of the propellant powder is 11.5-12.5MPa through multiple rounds of calculation.
For the propellant powder with the formula, the pressure and extension pressure of the propellant powder is calculated to be 11.5-12.5MPa by adopting the calculation steps, and the corresponding discharge speed and the diameter of the explosive strip under different pressure points can be obtained.
Therefore, the invention can calculate the new propellant powder formula without depending on experience data and artificial experience, and provides a more appropriate pressure-extension pressure range value.
Claims (1)
1. A method for calculating parameters of a propellant powder compression and extension process comprises the following steps:
(1) kneading the propellant powder formula materials;
(2) testing the rheological property of the medicine material by using a capillary rheometer;
(3) selecting different constitutive equations, and fitting equation parameters;
(4) selecting a constitutive equation with the fitting degree at least greater than 0.9 as a standby equation, and otherwise, supplementing test points;
(5) establishing a three-dimensional model of the medicine cylinder and the punch by adopting modeling software;
(6) performing logical operation of a geometric body on the three-dimensional model to obtain a three-dimensional model of the medicine;
(7) calculating and solving the three-dimensional model of the medicine material in a pressing and stretching process by adopting a finite element analysis method to obtain the results of pressing and stretching pressure, medicine discharging speed of the medicine material and diameter of the medicine strip;
(8) monitoring the relation between the diameter of the medicine strip and the target diameter in real time, and if the error requirement is not met, adjusting the pressure and stretching pressure to carry out the previous step;
(9) the compression and extension pressure range of the propellant powder is obtained.
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| CN201710729101.6A CN107491614B (en) | 2017-08-23 | 2017-08-23 | Method for calculating parameters of propellant powder compression and extension process |
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| CN107491614B true CN107491614B (en) | 2020-12-15 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102854093A (en) * | 2012-10-11 | 2013-01-02 | 北京理工大学 | Method and device for measuring rheological properties of sensitive medicine material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854093A (en) * | 2012-10-11 | 2013-01-02 | 北京理工大学 | Method and device for measuring rheological properties of sensitive medicine material |
Non-Patent Citations (1)
| Title |
|---|
| "七孔硝基胍发射药模具内流动过程数值仿真与优化";常飞;《中国优秀硕士学位论文全文数据库 工程科技I辑（月刊）》;20170715;摘要、正文第16-32页 * |
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