Coating die for side surface of medicine column of solid propellant and coating method

A solid propellant and coating technology, which is applied to household appliances, other household appliances, household components, etc., can solve problems such as long insertion time, lack of coating material, and poor vacuum degassing effect, so as to reduce coating man-hours , Improve coating efficiency and coating quality, and improve production efficiency

Active Publication Date: 2019-12-24
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is time-consuming and labor-intensive, and it is necessary to observe the overflow state of the slurry in real time during the insertion of the grain. The above method is suitable for the molding of t

Method used

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  • Coating die for side surface of medicine column of solid propellant and coating method
  • Coating die for side surface of medicine column of solid propellant and coating method
  • Coating die for side surface of medicine column of solid propellant and coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] After the mold base is put into the sealing ring, the base and the covering cylinder are tightly connected with screws, ready for use. Such as Image 6 As shown, the side coating of the grain column includes the following steps:

[0061] Step 1. Clean the surface of the grain column shaping. After shaping, the diameter d of the grain column to be coated is 35mm, the side surface needs to be covered with a height h1 of 100mm, the height of the trapezoidal boss h2 is 10mm, the bevel angle α is 45°, and the coating layer is average Thickness r is 0.7mm;

[0062] Step 2: Put the grain into the coating mold at room temperature (25°C ~ 35°C). The grain and the mold do not need to be preheated in advance. The inner diameter L of the mold coating cylinder for coating is 36.4mm, and the height is different Less than H1 is 150mm, the bevel angle α of the V-shaped groove of the base is 45°, the diameter L of the bottom surface of the V-shaped groove is 36.4mm, and the height H2 ...

Embodiment 2

[0071] According to the steps in Example 1, the diameter d of the grain to be coated is 60 mm, the side height h1 of the grain to be coated is 150 mm, the thickness r of the coating layer is 0.5 mm, and the oblique angle α of the trapezoidal boss of the grain after shaping is 30 °. The main dimensions of the mold used to coat the grain are: the height H1 of the coating cylinder is 250mm, and the inner diameter L is 61mm; the diameter L of the bottom surface of the V-shaped groove of the base is 61mm, and the bevel angle α is 30°. Preheat at 55℃~65℃.

[0072] The material of the coating layer is an epoxy coating layer. After the coating layer is prepared at room temperature, it is placed in an environment of 55°C to 65°C for preheating for 10min-15min. The viscosity of the slurry before adding the coating mold is measured to be 12Pa. s. The density of the cladding layer is approximately 1.0g / cm3. In theory, the mass required for the cladding layer to fill the gap between the ...

Embodiment 3

[0075] According to the steps of Example 1, the mold is put into a vacuum tank, and when the vacuum degree reaches -0.09MPa, keep it for 30 minutes; slowly deflate for 10 minutes, and take out the coated mold.

[0076] According to this condition, the grain was coated, and the defects of the coating layer on the side of the grain (lack of material, air bubbles, debonding) were inspected, and the bonding condition of the interface of the coated grain was ultrasonically tested. The results are shown in Table 1.

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Abstract

The invention relates to a coating die for the side surface of a medicine column of a solid propellant and a coating method, in particular to the die for coating the side surface of the medicine column of the solid propellant and the medicine column coating method. More specifically, the coating die comprises a base, a conical groove is formed in the inner surface of the base, and a sealing ring is arranged between the base and a coating cylinder. By means of the method adopting the die for coating the medicine column, the process that a medicine column is inserted in die slurry in the prior art is cancelled, namely, the medicine column is put into the die firstly, then coating layer slurry is added, and the coated medicine column is obtained after vacuumizing for degassing, degassing forpressure releasing, curing for demoulding, and shaping.

Description

technical field [0001] The present invention relates to a solid propellant grain side coating mold and coating method, in particular to a solid propellant grain side coating mold and grain coating method, more specifically, the present invention relates to a A covering mold with a tapered groove on the inner surface of the base, a sealing ring between the base and the covering cylinder, and a method for covering the grain with the mold, which eliminates the need to insert the grain into the mold slurry in the prior art The first process is to put the powder into the mold first, then add the coating layer slurry, vacuumize and degas, deflate and release the pressure, solidify and demould, and shape the coated powder to obtain the powder. Background technique [0002] In order to control the combustion area of ​​the propellant grain and ensure the internal ballistic performance of the free-loading solid rocket motor or gas generator to meet the design requirements, it is neces...

Claims

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Application Information

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IPC IPC(8): B29C39/10B29C39/42B29C39/26B29L31/30
CPCB29C39/10B29C39/26B29C39/42B29L2031/3097
Inventor 李悦李东峰张纲要尹华丽黄海龙程靖萱王玉桑丽鹏
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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