Shell recycling method after small solid engine reaches service life

Abstract

The invention provides a method for recycling a shell after the service life of a small solid engine. The method comprises the following steps: acquiring technical indexes of a charge combustion chamber shell of the small solid engine with the service life; appearance inspection is conducted on the small solid rocket engine reaching the service life, a recycled shell is obtained through screening, the recycled shell meeting the material trade mark is reused, hardness detection is conducted on other shells, and the shells continue to be used subsequently after meeting the national standard or the national military standard of the material trade mark; the method comprises the following steps: modifying a recycled shell into a shell of a new engine, detecting the shell of the new engine, testing the bursting strength of the shell by adopting a water explosion test mode, and verifying whether the shell meets the use requirement or not through a water pressure test. According to the invention, the life-reached engine shell can be reused, so that great economic benefits are generated; due to the fact that a formed product is used for producing a new engine shell, the shell production process and cost can be reduced.

Description

Technical Field

[0001] The invention relates to the field of solid rocket engines, in particular to a method for recycling rocket engines after their service life has expired. Background Art

[0002] According to the specification, small solid rocket engines with a diameter of less than 300mm are currently widely used as power sources for various rockets, boosters and other products. At present, a large number of small solid rocket engines have exceeded their service life and entered the destruction process. Direct destruction of these engines will cause great waste, especially when their metal components are almost intact. The current method of recycling rocket engine shells is mainly to burn the engine combustion chamber in the open air and then recycle the metal shells involved as scrap iron.

[0003] The disadvantages of this method are:

[0004] a. When the combustion chamber burns, a large amount of harmful gases will be produced, polluting the environment;

[0005] b. The performance of the recycled metal parts has deteriorated and they can only be recycled as scrap iron, which is a serious economic waste. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a method for recycling the casing of a small solid engine after its service life. The recycling method designed by the present invention is to achieve the following purposes:

[0007] a. The shell is safe and pollution-free when recycled;

[0008] b. After the shell is retracted, it can ensure that the performance requirements are met;

[0009] c. Apply after-sales shells to new products to achieve economic benefits.

[0010] The steps of the technical solution adopted by the present invention to solve its technical problem are:

[0011] Step 1: Obtain the technical indicators of the combustion chamber shell of a small solid-fuel engine with a long service life;

[0012] Step 2: Perform an appearance inspection on the small solid rocket engines that have reached the end of their service life. Scrap the engines that are obviously rusted or damaged. Use hydrodynamic cavitation technology to remove non-metallic materials from the combustion chambers of the engines that are in good appearance to obtain recycled shells.

[0013] Step 3: Select two recycled shells with the longest storage time for performance inspection, obtain the tensile strength, elongation, hardness and material composition of the shell material, and conduct metallographic analysis, ultrasonic flaw detection and magnetic particle flaw detection. The shells that meet the national standard or national military standard of the material grade and have no defects found by ultrasonic flaw detection and magnetic particle flaw detection will be reused. The remaining shells need to be hardness tested, and continue to be used after meeting the national standard or national military standard of the material grade;

[0014] Step 4: On the premise of using the recycled shell interface, the recycled shell is transformed into the shell of the new engine. The shell of the new engine is different from the recycled shell in length, and the shell is processed by cutting and welding to produce the shell of the new engine;

[0015] Step 5: Inspect the casing of the new engine, test its bursting strength through a water explosion test, and verify whether the casing meets the requirements for use through a water pressure test.

[0016] The technical indicators include product structure size, shell material brand, shell material tensile strength, elongation, storage time and storage environment.

[0017] The hydrodynamic cavitation technology uses high-pressure water to quickly reduce pressure to form a large number of microbubbles. During the collapse of the microbubbles, a large number of microjets are generated. The non-metallic material is removed by the erosion effect of the microjets while ensuring that the shell is not damaged.

[0018] The beneficial effects of the present invention are:

[0019] a. The engine casing that has reached the end of its service life can be reused, generating greater economic benefits;

[0020] b. Since molded products are used to produce new engine housings, the production process and cost of the housings can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A typical rocket engine combustion chamber.

[0022] Figure 2 It is the metal shell of a typical rocket engine combustion chamber.

[0023] Figure 3 It is the metal shell of a certain type of φ122mm solid rocket engine combustion chamber.

[0024] Figure 4 It is the metal shell of a combustion chamber of a certain type of φ122mm solid rocket engine after cutting.

[0025] Figure 5 The metal shell of a φ122mm unmanned target drone booster combustion chamber.

[0026] Among them, 1-metal shell, 2-insulation layer, lining and other non-metallic materials, 3-propellant, 4-weld position. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] A method for recycling and remaking the shell of a small solid engine after its service life:

[0029] The first step is to obtain the technical indicators of the small solid engine charge combustion chamber shell with a long service life; the technical indicators include product structure size, shell material brand, shell material tensile strength, elongation, storage time and storage environment.

[0030] Step 2: Perform an appearance inspection on the small solid rocket engines that have reached the end of their service life. Scrap the engines that are obviously rusted or damaged. Use hydrodynamic cavitation technology to remove non-metallic materials from the combustion chambers of the engines that are in good appearance to obtain recycled shells.

[0031] The hydrodynamic cavitation technology uses high-pressure water to quickly reduce pressure to form a large number of microbubbles. During the collapse of the microbubbles, a large number of microjets are generated. The non-metallic material is removed by the erosion effect of the microjets while ensuring that the shell is not damaged.

[0032] Step 3: Select two recycled shells with the longest storage time for performance inspection, obtain the tensile strength, elongation, hardness and material composition of the shell material, and conduct metallographic analysis, ultrasonic flaw detection and magnetic particle flaw detection. The shells that meet the national standard or national military standard of the material grade and have no defects found by ultrasonic flaw detection and magnetic particle flaw detection will be reused. The remaining shells need to be hardness tested, and continue to be used after meeting the national standard or national military standard of the material grade;

[0033] Step 4: On the premise of using the recycled shell interface, the recycled shell is transformed into the shell of the new engine. The shell of the new engine is different from the recycled shell in length, and the shell is processed by cutting and welding to produce the shell of the new engine;

[0034] Step 5: Inspect the casing of the new engine, test its bursting strength through a water explosion test, and verify whether the casing meets the requirements for use through a water pressure test.

[0035] Figure 1 The combustion chamber of a typical rocket engine is recovered by hydrodynamic cavitation technology. Figure 2 shown.

[0036] After performance testing and non-destructive testing, and confirmation that the recycled shell meets the use requirements, the recycled shell can be cut according to the redesigned engine shell, and the combustion chamber shell of the new engine can be reprocessed at the cut through welding, machining and other methods, and inspected through water burst tests, etc.

[0037] A certain type of φ122mm solid rocket engine needs to be destroyed after its service life. Its engine shell can be used on a certain type of φ122mm unmanned target booster. The original engine shell is about 1.8m long. Figure 3 As shown, after being processed, it is cut to form parts to be processed, such as Figure 4 As shown, the metal shell of the unmanned target drone booster combustion chamber is finally obtained by welding, as shown in FIG. Figure 5 shown.

Claims

1. A method for recycling the shell of a small solid engine after its service life, characterized in that The steps include: Step 1: Obtain the technical indicators of the combustion chamber shell of a small solid-fuel engine with a long service life; Step 2: Perform an appearance inspection on the small solid rocket engines that have reached the end of their service life. Scrap the engines that are obviously rusted or damaged. Use hydrodynamic cavitation technology to remove non-metallic materials from the combustion chambers of the engines that are in good appearance to obtain recycled shells. Step 3: Select two recycled shells with the longest storage time for performance inspection, obtain the tensile strength, elongation, hardness and material composition of the shell material, and conduct metallographic analysis, ultrasonic flaw detection and magnetic particle flaw detection. The shells that meet the national standard or national military standard of the material grade and have no defects found by ultrasonic flaw detection and magnetic particle flaw detection will be reused. The remaining shells need to be hardness tested, and continue to be used after meeting the national standard or national military standard of the material grade; Step 4: On the premise of using the recycled shell interface, the recycled shell is transformed into the shell of the new engine. The shell of the new engine is different from the recycled shell in length, and the shell is processed by cutting and welding to produce the shell of the new engine; Step 5: Inspect the casing of the new engine, test its bursting strength through a water explosion test, and verify whether the casing meets the use requirements through a water pressure test.

2. The method for recycling the casing of a small solid engine after its service life according to claim 1 is characterized in that: The technical indicators include product structure size, shell material brand, shell material tensile strength, elongation, storage time and storage environment.

3. The method for recycling the casing of a small solid engine after its service life according to claim 1 is characterized in that: The hydrodynamic cavitation technology uses high-pressure water to quickly reduce pressure to form a large number of microbubbles. During the collapse of the microbubbles, a large number of microjets are generated. The non-metallic material is removed by the erosion effect of the microjets while ensuring that the shell is not damaged.

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