A method for recycling solid engine casing after long-term storage

Abstract

The present invention provides a method for recycling a solid engine casing after long-term storage. The solid engine casing after the medicine is cleaned is received and an appearance inspection is performed. If there is no obvious damage or rust on the appearance, it can be used later. The casing is tested, including size detection, non-destructive testing and slice performance testing. The non-destructive testing includes ultrasonic flaw detection and magnetic particle flaw detection. If the test results are qualified, it can be used later. The casing is subjected to a water pressure test and a water explosion test to detect whether the casing can meet the use requirements. The present invention can quickly and effectively detect engine casings that can be reused. The requirements for reuse are met, costs are reduced, and waste of resources is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of post-processing, and designs a method for recycling a solid engine casing after long-term storage. Background Art

[0002] At present, the way to scrap rocket engines after long-term storage in China is to burn out the internal propellant and recycle the remaining metal parts at the price of scrap steel. This has low returns, causes waste of resources, and is not in line with economic interests.

[0003] After long-term storage, the life of the non-metallic materials of the rocket engine expires, but the metal parts still retain their original performance and can continue to be used. The engine casing is of high value and can be recycled, so a recycling plan and standard are needed to enable the casing to be used again. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for recycling solid engine casings after long-term storage. The purpose of the present invention is to provide a method for recycling solid engine casings after long-term storage, which can quickly and effectively detect engine casings that can be used again.

[0005] The specific steps of the technical solution adopted by the present invention to solve its technical problem are:

[0006] The first step is to receive the solid engine casing after cleaning and conduct an appearance inspection. If there is no obvious damage or rust on the appearance, it can be used later;

[0007] The second step is to inspect the shell, including size inspection, non-destructive inspection and slice performance inspection. Non-destructive inspection includes ultrasonic flaw detection and magnetic particle inspection. If the inspection results are qualified, it can be used later.

[0008] The third step is to conduct water pressure test and water explosion test on the shell to check whether the shell can meet the use requirements.

[0009] The dimension detection is: to detect according to the design and processing dimensions of the shell, and the design and processing dimensions of the shell include total length, total weight, diameter, interface thread, positioning surface diameter, axial length of each step, shell thickness, roundness, verticality and coaxiality.

[0010] In the non-destructive testing, when performing magnetic particle inspection, the surface paint layer needs to be cleaned before performing magnetic particle inspection.

[0011] The slicing performance test is as follows: determine the slicing axial position, no less than 3 places, cut 6 test pieces radially at each place, obtain the tensile strength of the test piece material by the stretching method, and the measured tensile strength is greater than the standard strength of the material for passing.

[0012] The water pressure test is as follows: the water pressure test tooling is designed according to the shell interface, the water pressure test pressure refers to the original shell detection pressure or the new engine working pressure, and the shell can be recycled after passing the test;

[0013] The water explosion test is as follows: the explosion pressure Pb is calculated according to the minimum design thickness of the shell, and the shell explosion pressure is greater than Pb;

[0014]

[0015] In the formula, k β is the material strength coefficient; σ b is the strength limit of the material, h is the minimum design wall thickness; D c is the shell diameter.

[0016] The solid motor casings received after being cleared of medicine are subject to random inspection, with the number of inspections being once per batch. After the performance is stable, the probability of random inspections may be reduced or cancelled based on actual conditions.

[0017] The beneficial effect of the present invention is that the casing that passes the inspection can be recycled and used in a new engine, thus meeting the requirement of reuse, reducing costs and avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the detection process of the present invention.

[0019] Figure 2 It is a schematic diagram of the axial position of the present invention.

[0020] Figure 3 It is a schematic diagram of the radial position of the present invention.

[0021] Figure 4 It is the test piece size of the present invention.

[0022] Figure 5 Recycling scheme for a certain type of engine casing.

[0023] Figure 6 Schematic diagram of test piece selection position, Figure 6 (a) is a schematic diagram of the axial position of the front combustion chamber casing. Figure 6 (b) is a schematic diagram of the axial position of the afterburner casing. Figure 6 (c) is a schematic diagram of the circumferential position. Figure 6 (d) is a schematic diagram of the test piece dimensions.

[0024] Figure 7 Schematic diagram of a certain type of engine casing. Figure 7 (a) is a schematic diagram of the front section. Figure 7 (b) is a schematic diagram of the latter section. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] The first step is to receive the solid engine casing after cleaning and conduct an appearance inspection. If there is no obvious damage or rust on the appearance, it can be used later;

[0027] The second step is to inspect the shell, including size inspection, non-destructive inspection and slice performance inspection. Non-destructive inspection includes ultrasonic flaw detection and magnetic particle inspection. If the inspection results are qualified, it can be used later.

[0028] The dimension detection is: detection according to the design and processing dimensions of the shell, the design and processing dimensions of the shell include total length, total weight, diameter, interface thread, positioning surface diameter, axial length of each step, shell thickness, roundness, verticality and coaxiality;

[0029] In the non-destructive testing, when performing magnetic particle inspection, the surface paint layer needs to be cleaned before performing magnetic particle inspection.

[0030] The slicing performance test is as follows: Figure 2 As shown, determine the axial position of the slice, no less than 3, according to Figure 3 Cut 6 test pieces along the radial direction at each location as shown, and the test piece size is as follows Figure 4 As shown, the tensile strength of the test piece material is obtained by the stretching method, and the tensile strength measured is greater than the standard strength of the material, which is qualified;

[0031] Figure 4 Where, L1 is the total length of the test piece; h is the thickness of the test piece; L0 is the original gauge length ( S0- cross-sectional area of ​​effective position of test piece); r- radius of transition arc; Lc- parallel length (>L0+b0 / 2)

[0032] The third step is to conduct water pressure test and water explosion test on the shell to detect whether the shell can meet the use requirements;

[0033] The water pressure test is as follows: the water pressure test tooling is designed according to the shell interface, the water pressure test pressure refers to the original shell detection pressure or the new engine working pressure, and the shell can be recycled after passing the test;

[0034] The water explosion test is as follows: the explosion pressure Pb is calculated according to the minimum design thickness of the shell, and the shell explosion pressure is greater than Pb;

[0035]

[0036] In the formula, k β is the material strength coefficient; σ b is the strength limit of the material, h is the minimum design wall thickness; D c is the shell diameter.

[0037] For random inspection items, the number of random inspections is once per batch. After the performance is stable, the probability of random inspections will be reduced or even cancelled based on actual conditions.

[0038] In an embodiment of the present invention, the recycled engine casing adopts a certain type of solid rocket engine casing. Figure 5 The following is a structural diagram of a certain type of engine casing, which is divided into two sections, front and back. A preferred recycling scheme is Figure 6 As shown:

[0039] 1) After emptying the shell and charging, conduct appearance inspection and cut test pieces for physical and chemical properties inspection;

[0040] 2) After the shell is emptied of the charge, it is subjected to appearance inspection and non-destructive inspection, and after passing the inspection, it is subjected to segmented water pressure inspection;

[0041] 3) The shell that has been emptied of charge is recycled into a new engine, and the shell that has been tested on the ground is subjected to a segmented water explosion test.

[0042] In the first step, the physical and chemical properties of the test piece are tested. The test piece is cut at the position shown in Figure 6 As shown: the shell material is D6AC, and test pieces are cut at the front joint, barrel section, and rear joint positions, with no less than 6 pieces at each position.

[0043] The hydraulic pressure and water burst test in the second and third steps is as follows Figure 7 shown.

Claims

1. A method for recycling a solid engine casing after long-term storage, characterized in that The steps include: The first step is to receive the solid engine casing after cleaning and conduct an appearance inspection. If there is no obvious damage or rust on the appearance, it can be used later; The second step is to inspect the shell, including size inspection, non-destructive inspection and slice performance inspection. Non-destructive inspection includes ultrasonic flaw detection and magnetic particle inspection. If the inspection results are qualified, it can be used later. The third step is to conduct water pressure test and water explosion test on the shell to check whether the shell can meet the use requirements.

2. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: The dimension detection is: to detect according to the design and processing dimensions of the shell, and the design and processing dimensions of the shell include total length, total weight, diameter, interface thread, positioning surface diameter, axial length of each step, shell thickness, roundness, verticality and coaxiality.

3. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: In the non-destructive testing, when performing magnetic particle inspection, the surface paint layer needs to be cleaned before performing magnetic particle inspection.

4. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: The slicing performance test is as follows: determine the slicing axial position, no less than 3 places, cut 6 test pieces radially at each place, obtain the tensile strength of the test piece material by the stretching method, and the measured tensile strength is greater than the standard strength of the material for passing.

5. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: The water pressure test is as follows: a water pressure test fixture is designed according to the shell interface; the water pressure test pressure refers to the original shell detection pressure or the new engine working pressure; and the shell can be recycled after passing the test.

6. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: The water explosion test is as follows: the explosion pressure Pb is calculated according to the minimum design thickness of the shell, and the shell explosion pressure is greater than Pb; In the formula, k β is the material strength coefficient; σ b is the strength limit of the material, h is the minimum design wall thickness; D c is the shell diameter.

7. The method for recycling solid motor casing after long-term storage according to claim 1, characterized in that: The solid motor casings received after being cleared of medicine are subject to random inspection, with the number of inspections being once per batch. After the performance is stable, the probability of random inspections may be reduced or cancelled based on actual conditions.

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