Repair method for surface bulging defect of solid rocket motor casing heat insulation layer
A technology for engine casings and solid rockets, which can be applied to household appliances, other household appliances, and household components, etc. It can solve the problems of poor bonding firmness and failure to meet the requirements of use, and achieve the effect of firm bonding
Active Publication Date: 2021-03-30
湖北三江航天江北机械工程有限公司
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Problems solved by technology
However, the surface bulging defect of the EPDM insulation layer of the solid rocket motor repaired by the existing normal temperature curing repair method has poor bonding firmness and cannot meet the use requirements.
Method used
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Embodiment Construction
[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] The casing of a certain type of solid rocket motor is a filament-wound composite casing, and its insulation layer is made of EPDM rubber material. The repair process for surface bulge defects is as follows:
[0030] 1) According to the position and size of the bulging defect on the surface of the heat insulation layer and the airflow operation mode of the engine, the cutting method is selected as C-shaped cutting, from figure 1 , figure 2 It can be seen that the C-shaped cutting is close to the body part of the heat insulation layer, and three-quarters of the bulge defect (ie, figure 1 The ACB part in is the cutting part), this cutting method can achieve smooth repairing along the airflow during repairing.
[0031] 2) Turn over the EPDM film with bulging defects that have been cut, and use a pneumatic grinding wheel to polis...
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The invention discloses a method for repairing bulging defects on the surface of a heat insulating layer of a solid rocket engine shell. The method comprises the following steps of 1) carrying out C-shaped cutting on the surface bulge defect of the heat insulating layer; 2) turning the cut-off ethylene-propylene-diene monomer rubber sheet with bulge defect, and grinding the inner surface and the outer surface of the rubber sheet to form an adhesive area; 3) cleaning the polished adhesive area by using a special cleaning agent; 4) carrying out in-situ reset repairing on the bulge defect; 5) pre-curing; 6) coating and repairing; 7) finally curing; and 8) finishing and processing. According to the method, the C-shaped cutting mode is adopted for cutting, and the integrity of the ethylene-propylene-diene monomer of the repaired shell can be ensured after polishing and adhesion repairing; after cutting and downstream airflow smoothing and repairing are carried out according to the directionof the air-jetting reverse airflow after the shell is loaded, the acting force of turning on the repairing part during the working jet of the product is guaranteed, a certain gas pressure is broughtto the repairing position of the downstream airflow during jetting, so that the repairing position is firmer.
Description
technical field [0001] The invention belongs to the technical repair field of heat insulation of composite material products, and in particular relates to a method for repairing bulging defects on the surface of a heat insulation layer of a solid rocket motor casing. Background technique [0002] With the development of my country's aerospace industry, it is particularly important to reduce the weight of aerospace products to improve the performance of aircraft. Composite materials with higher specific strength and specific stiffness are gradually replacing traditional steel, aluminum alloy and titanium alloy, and have been used more and more in the field of aerospace and aviation, which is obviously manifested in the filament wound composite engine (that is, solid Rocket motor) casing applications. The heat insulation layer is an important part of the engine casing of the fiber wound composite material. During the operation of the engine casing of the fiber wound composite...
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IPC IPC(8): B29C73/10B29C73/12B29C73/26B29L31/30
CPCB29C73/10B29C73/12B29C73/26B29C2073/262B29C2073/264B29L2031/3097
Inventor 李润暖谭云水肖雯静佘平江
Owner 湖北三江航天江北机械工程有限公司