A method for verifying the effectiveness of a rail protection coating

Abstract

The application discloses a kind of track protective coating effectiveness verification method, utilize two-stage light gas gun high-pressure experimental platform as high-speed launching device, launch the solid cylinder made of skid shoe material, make it collide with test target body made of slide rail material at a certain angle, compare the impact results when test target body has protective coating and has no protective coating, qualitative analysis is carried out to the effectiveness of protective coating.The application can guide the coating work of the track of hypersonic rocket sled test, improve test efficiency, and ensure test success rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of target test technology, and particularly relates to a method for verifying effectiveness of a track protective coating. BACKGROUND

[0002] Chisel damage often occurs in hypersonic rocket sled test. The occurrence of chisel damage will lead to the deterioration of the sled running environment and affect the test safety. In order to reduce the severity of chisel damage, the method of coating protective coating on the track is proposed at home and abroad. However, the effectiveness of this method has not been given a clear conclusion. The occurrence of chisel damage in hypersonic rocket sled test is random. Even if the test parameters are completely consistent, the speed conditions of chisel damage occurrence are not necessarily the same when repeated. Therefore, it is impossible to compare and analyze whether the occurrence of chisel damage is different when there is no coating on the track by repeating the hypersonic rocket sled test. Furthermore, the direct cost of hypersonic rocket sled test is high, the preparation period is long, and the safety risk is great. It is not realistic to study the influence of track coating on chisel damage by carrying out hypersonic rocket sled test for many times. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a method for verifying the effectiveness of a track protective coating. A two-stage light gas gun high-pressure test platform is used as a high-speed launching device to launch a solid cylinder made of a sliding shoe material, so that it collides with a test target body made of a sliding rail material at a certain angle. The impact results of the test target body with and without protective coating are compared, and the effectiveness of the protective coating is qualitatively analyzed. The present application can guide the coating work of the track of the hypersonic rocket sled test, improve the test efficiency, and ensure the success rate of the test.

[0004] The technical solution adopted by the present application to solve its technical problems is as follows:

[0005] Step 1: According to the barrel diameter of the two-stage light gas gun and the size of the target chamber, the projectile and the target body are processed by using a numerical control machine tool to ensure parallelism and flatness;

[0006] Step 2: A bracket for supporting and placing the target body is made, and the bracket is fixed to the built-in base in the target chamber through bolts;

[0007] Step 3: A protective cylinder is made and arranged at the end of the target body to prevent the projectile flying out of the target body from impacting the target chamber; a high-pressure polyethylene cylinder is placed in the protective cylinder for recovering the projectile flying out of the target body carrying collision information;

[0008] Step 4: The support height of the bracket is adjusted by adding a gasket between the bracket and the base to adjust the collision angle of the projectile and the target body; the angle of the bracket is calculated by measuring the length L of the bracket bottom plate and the height h of the bracket tail, and then the formula is used.

[0009] Step 5: Install the target body without coating on the support;

[0010] Step 6: Arrange a magnetic velocity measuring device at the outlet of the secondary light gas gun launch tube for measuring the impact velocity of the projectile against the target body;

[0011] Step 7: Set the impact velocity v of the projectile against the target body by adjusting the mass of hydrogen and oxygen in the combustion chamber of the secondary light gas gun;

[0012] Step 8: Conduct a test of the target body without coating, recorded as Test 1;

[0013] Step 9: Recover the target body subjected to high-speed impact in Step 8;

[0014] Step 10: Put the protective coating into a container, immerse the target body completely in the coating for n minutes, and then vertically place the target body in a cool and ventilated place until the coating is completely dry;

[0015] Step 11: Install the target body treated in Step 10 on the support;

[0016] Step 12: Repeat Step 7.

[0017] Step 13: Conduct a test of the target body with coating, recorded as Test 2;

[0018] Step 14: Recover the target body subjected to high-speed impact in Step 13;

[0019] Step 15: Cut the target bodies recovered in Step 9 and Step 13 along the axis to find the impact craters, machine, polish and sample the impact craters, and use scanning electron microscopy, energy spectrum and electron backscatter diffraction technology to comparatively analyze the macroscopic morphology, microscopic structure and crystal phase structure changes of the impact craters in the two target bodies, so as to determine the protective effectiveness of the coating.

[0020] Preferably, the processing material of the projectile is rocket sled sliding shoe material, and the shape of the projectile is a solid cylinder.

[0021] Preferably, the processing material of the target body is rocket sled track material, and the target body is a hollow cylinder.

[0022] A computer program, which causes a computer to execute the above verification method.

[0023] An electronic device, comprising a processor and a memory; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the electronic device executes the above verification method.

[0024] A computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the above verification method.

[0025] A chip comprising a processor for calling and running a computer program from a memory, so that a device installed with the chip performs the above-mentioned verification method.

[0026] A computer program product comprising a computer storage medium storing a computer program, the computer program comprising instructions executable by at least one processor, which, when executed by the at least one processor, implement the above-mentioned verification method.

[0027] The beneficial effects of the present application are as follows:

[0028] The present application can guide the coating work of the hypersonic rocket sled test track, improve the test efficiency, and ensure the test success rate. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the experimental device of the present application.

[0030] Figure 2 is a schematic diagram of the support of the present application.

[0031] Figure 3 is a test signal of an embodiment of the present application.

[0032] Figure 4 is a test result of a non-coated target body of an embodiment of the present application.

[0033] Figure 5 is a test result of a coated target body of an embodiment of the present application. DETAILED DESCRIPTION

[0034] The present application will be further described below in conjunction with the drawings and embodiments.

[0035] The high-speed movement of the rocket sled is simulated by launching a projectile using a two-stage light gas gun high-pressure experiment platform, and a target body is arranged in the target chamber of the two-stage light gas gun as the collision object of the projectile, so as to simulate the impact behavior of the rocket sled shoe on the track. The purpose of the present application is to verify whether the coating on the track has an inhibitory effect on the gouging in the hypersonic rocket sled test in the laboratory. The completion of the present application can guide the coating work of the hypersonic rocket sled test track, improve the test efficiency, and ensure the test success rate.

[0036] As shown in Figure 1 The present application is implemented by the following technical solutions, specifically including the following steps:

[0037] 1) According to the caliber of the two-stage light gas gun and the size of the target chamber, the projectile and the target body are processed by numerical control machine tool to ensure good parallelism and flatness. The material of the processed projectile is the rocket sled sliding shoe material, and the shape of the projectile is a solid cylinder. The material of the processed target body is the rocket sled track material, and the target body is a hollow cylinder with a certain wall thickness.

[0038] 2) A bracket for supporting and placing the target body is made, and the bracket is fixed to the base in the target chamber by bolts.

[0039] 3) A protective cylinder is made at the end of the target body to prevent the projectile that may fly out of the target body from hitting the target chamber. A certain thickness of high-pressure polyethylene cylinder is placed in the protective cylinder for recycling the projectile that may fly out of the target body carrying collision information.

[0040] 4) The support height of the bracket is adjusted by adding a gasket between the bracket and the base to adjust the collision angle of the projectile and the target body. The angle of the bracket is calculated by measuring the length L of the bracket bottom steel plate and the height h of the bracket tail, and then using the formula .

[0041] 5) The target body without coating is installed on the bracket.

[0042] 6) A magnetic speed measuring device is arranged at the exit of the two-stage light gas gun launch tube for measuring the impact speed of the projectile and the target body.

[0043] 7) The impact speed v of the projectile on the target body is set by adjusting the mass of hydrogen and oxygen in the explosion chamber of the two-stage light gas gun.

[0044] 8) The uncoated target body test is carried out, denoted as test 1.

[0045] 9) The target body subjected to high-speed impact in step 8) is recovered.

[0046] 10) The protective coating is loaded into a container, the target body is completely immersed in the coating for n minutes, and the target body is taken out and placed vertically in a cool and ventilated place until the coating is completely dry.

[0047] 11) The target body treated in step 10) is installed on the bracket.

[0048] 12) Step 7) is repeated.

[0049] 13) The coated target body test is carried out, denoted as test 2.

[0050] 14) The target body subjected to high-speed impact in step 13) is recovered.

[0051] 15) The target bodies recovered in step 9) and step 13) are cut along the axis to find the impact craters. The impact craters are machined, polished and sampled, and the macro-morphology, microstructure and crystal phase structure changes of the impact craters in the two target bodies are analyzed by scanning electron microscopy, energy spectrum and electron backscatter diffraction technology to determine the protective effectiveness of the coating.

[0052] Embodiment:

[0053] Verify the gouging damage inhibition ability of the epoxy resin-based coating to the U71Mn rocket sled track when the 30CrMnSiNi2A sliding shoe of the rocket sled impacts the U71Mn rocket sled track at a speed of 5Ma.

[0054] Step 1: Use 30CrMnSiNi2A steel to process the projectile, and use U71Mn steel to process the target body.

[0055] Step 2: Use 45 steel to process the support, as shown in Figure 2 The support is connected to the base.

[0056] Step 3: Use 45 steel to process the protective cylinder, and place a 3cm thick high-pressure polyethylene cylinder in the protective cylinder.

[0057] Step 4: Adjust the support height by adding spacers between the support and the base to make the angle 3°. First measure the length L of the steel plate at the bottom of the support, and calculate the thickness of the spacer by the formula h = L sin β.

[0058] Step 5: Install the target body without coating on the support.

[0059] Step 6: Place a magnetic velocity measuring device at the outlet of the two-stage light gas gun launch tube to measure the impact speed of the projectile and the target body.

[0060] Step 7: Set the impact speed of the projectile on the target body to 5Ma by adjusting the mass of hydrogen and oxygen in the explosion chamber of the two-stage light gas gun.

[0061] Step 8: Conduct a test on the target body without coating, denoted as Test 1.

[0062] Step 9: Recover the target body subjected to high-speed impact in step 8, analyze the test data, as shown in Figure 3 , to obtain the actual impact speed.

[0063] Step 10: Fill the container with epoxy resin-based coating, immerse the target body completely in the coating for 3 minutes, and place the target body vertically in a cool and ventilated place until the coating is completely dry.

[0064] Step 11: Install the target body treated in step 10 on the support.

[0065] Step 12: Repeat step 7.

[0066] Step 13: Coated target test, denoted as Test 2, is carried out.

[0067] Step 14: The target subjected to high-speed impact in Step 13 is recovered, and test data is analyzed to obtain the actual impact speed.

[0068] Step 15: The targets subjected to high-speed impact in Test 1 and Test 2 are recovered, and are cut along the axis to find the impact craters. The impact crater of Test 1 is shown in FIG. 4, and the impact crater of Test 2 is shown in FIG. 5. The impact craters are machined, polished, and sampled, and the macroscopic morphology, microscopic structure, and crystal phase structure changes of the impact craters in the two targets are analyzed by scanning electron microscopy, energy spectrum, and electron backscatter diffraction techniques to determine the protective effectiveness of the coating. Figure 4 Figure 5 Step 15: The targets subjected to high-speed impact in Test 1 and Test 2 are recovered, and are cut along the axis to find the impact craters. The impact crater of Test 1 is shown in FIG. 4, and the impact crater of Test 2 is shown in FIG. 5. The impact craters are machined, polished, and sampled, and the macroscopic morphology, microscopic structure, and crystal phase structure changes of the impact craters in the two targets are analyzed by scanning electron microscopy, energy spectrum, and electron backscatter diffraction techniques to determine the protective effectiveness of the coating.​

Claims

1. A method of verifying the effectiveness of a rail protection coating, characterized in that, It comprises the following steps: Step 1: According to the muzzle diameter of the two-stage light gas gun and the size of the target chamber, the projectile and the target body are processed by using a numerical control machine tool to ensure parallelism and flatness; Step 2: A support for supporting and placing the target body is made, and the support is fixed to the built-in base in the target chamber through bolts; Step 3: A protective cylinder is made and arranged at the end of the target body to prevent the projectile flying out of the target body from impacting the target chamber; a high-pressure polyethylene cylinder is placed in the protective cylinder for recovering the projectile flying out of the target body carrying collision information; Step 4: Adjust the support height of the bracket by adding a spacer between the bracket and the base to adjust the impact angle of the projectile with the target body; the angle of the bracket is calculated by measuring the length L of the steel plate at the bottom of the bracket and the height h of the tail of the bracket, and then using the formula was performed; Step 5: The target body without coating is installed on the support; Step 6: A magnetic velocity measuring device is arranged at the outlet of the two-stage light gas gun launch tube for measuring the impact velocity of the projectile and the target body; Step 7: The impact velocity v of the projectile on the target body is set by adjusting the mass of hydrogen and oxygen in the explosion chamber of the two-stage light gas gun; Step 8: The test of the target body without coating is carried out, which is recorded as test 1; Step 9: The target body subjected to high-speed impact in step 8 is recovered; Step 10: The protective coating is loaded into a container, the target body is completely immersed in the coating for n minutes, and then the target body is taken out and vertically placed in a cool and ventilated place until the coating is completely dried; Step 11: The target body treated in step 10 is installed on the support; Step 12: Step 7 is repeated; Step 13: The test of the target body with coating is carried out, which is recorded as test 2; Step 14: The target body subjected to high-speed impact in step 13 is recovered; Step 15: The target bodies recovered in steps 9 and 13 are cut along the axis to find the impact craters, the impact craters are machined, polished and sampled, and the macroscopic morphology, microstructure and crystal phase structure changes of the impact craters in the two target bodies are compared and analyzed by using scanning electron microscopy, energy spectrum and electron backscattering diffraction technology to determine the protective effectiveness of the coating.

2. A method of verifying the effectiveness of a rail protection coating according to claim 1, characterized in that The processing material of the projectile is rocket sled sliding shoe material, and the shape of the projectile is a solid cylinder.

3. A method of verifying the effectiveness of a rail protection coating according to claim 1, characterized in that, The processing material of the target body is rocket sled track material, and the target body is a hollow cylinder.

4. An electronic device, comprising: It comprises: a processor and a memory; The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to enable the electronic device to perform the method of any one of claims 1 to 3.

5. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the method of any one of claims 1 to 3.

6. A chip, characterized by It comprises: a processor for calling and running a computer program from a memory, so that the device installed with the chip performs the method of any one of claims 1 to 3.

7. A computer program product, characterised in that, The computer program product comprises a computer storage medium storing a computer program, and the computer program comprises instructions executable by at least one processor, which implement the method of any one of claims 1 to 3 when executed by the at least one processor.

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