Method for verifying effectiveness of track protective coating

Abstract

The invention discloses a method for verifying the effectiveness of a track protective coating, which comprises the following steps of: launching a solid cylinder made of a sliding shoe material by using a two-stage light-gas gun high-pressure experimental platform as a high-speed launching device, so that the solid cylinder collides with a test target body made of a sliding rail material at a certain angle; and comparing the impact results when the test target body is provided with the protective coating and not provided with the protective coating, and carrying out qualitative analysis on the effectiveness of the protective coating. According to the invention, the coating work of the hypersonic velocity rocket sled test track can be guided, the test efficiency is improved, and the test success rate is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of range testing, and in particular relates to a method for verifying the effectiveness of a track protective coating. Background Art

[0002] Chipping damage often occurs in hypersonic rocket sled tests. The occurrence of chiselling will lead to the deterioration of the sled's operating environment and affect the safety of the test. In order to reduce the severity of chiselling, methods of coating protective coatings on the track have been proposed at home and abroad. However, the effectiveness of this method has not yet given a clear conclusion. The occurrence of chiselling in hypersonic rocket sled tests is random. Even if the test design parameters are exactly the same, the speed conditions for chiselling to occur may not be the same when repeated. Therefore, it is impossible to compare and analyze whether the results of chiselling are different when there is a coating on the track by repeating hypersonic rocket sled tests. Furthermore, the direct cost of hypersonic rocket sled tests is high, the preparation cycle is long, and the safety risk is high. It is unrealistic to study the impact of track coatings on chiselling by conducting multiple hypersonic rocket sled tests. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a method for verifying the effectiveness of track protective coatings. A two-stage light gas gun high-pressure test platform is used as a high-speed launch device to launch a solid cylinder made of a sliding shoe material, so that it collides with a test target made of a sliding rail material at a certain angle, and the collision results when there is a protective coating on the test target and when there is no protective coating are compared, and the effectiveness of the protective coating is qualitatively analyzed. The present invention can provide guidance for the coating work of the hypersonic rocket sled test track, improve the test efficiency, and ensure the test success rate.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] Step 1: According to the muzzle diameter and target chamber size of the two-stage light gas gun, the projectile and target body are processed by CNC machine tools to ensure parallelism and flatness;

[0006] Step 2: Make a bracket for supporting and placing the target body, and fix the bracket to the base built into the target chamber by bolts;

[0007] Step 3: Make a protective tube placed at the end of the target body to prevent the projectiles flying out of the target body from hitting the target chamber; place a high-pressure polyethylene cylinder in the protective tube to recover the projectiles flying out of the target body carrying collision information;

[0008] Step 4: Adjust the support height of the bracket by adding a gasket between the bracket and the base to adjust the collision angle between the projectile and the target; 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 conduct.

[0009] Step 5: Take the uncoated target and install it on the bracket;

[0010] Step 6: Arrange a magnetic velocity measuring device at the exit of the second-stage light gas gun launch tube to measure the impact velocity between the projectile and the target;

[0011] Step 7: By adjusting the mass of hydrogen and oxygen in the secondary light gas gun explosion chamber, the impact velocity v of the projectile on the target is set;

[0012] Step 8: Conduct an uncoated target test, recorded as Test 1;

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

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

[0015] Step 11: Take the target body processed in step 10 and install it on the bracket;

[0016] Step 12: Repeat step 7.

[0017] Step 13: Conduct a coated target test, recorded as Test 2;

[0018] Step 14: Recovering 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 crater, machine the impact crater, polish it and prepare samples, use scanning electron microscopy, energy spectrum and electron backscatter diffraction technology to compare and analyze the macroscopic morphology, microstructure and crystal phase structure changes of the impact craters in the two targets to determine the protective effectiveness of the coating.

[0020] Preferably, the processing material of the projectile is rocket sled slide 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 enables a computer to execute the above verification method.

[0023] An electronic device 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, so that the electronic device executes the above-mentioned verification method.

[0024] A computer-readable storage medium stores a computer program, which implements the above verification method when executed by a processor.

[0025] A chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned verification method.

[0026] A computer program product comprises a computer storage medium storing a computer program, wherein the computer program comprises instructions executable by at least one processor, and the verification method is implemented when the instructions are executed by the at least one processor.

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

[0028] The present invention can provide guidance for coating work of a hypersonic rocket sled test track, improve test efficiency, and ensure test success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the experimental device of the present invention.

[0030] Figure 2 Schematic diagram of the support of the present invention.

[0031] Figure 3 It is a test signal of the embodiment of the present invention.

[0032] Figure 4 This is the test result of the uncoated target in the embodiment of the present invention.

[0033] Figure 5 This is the test result of the coated target in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] The high-speed motion of a rocket sled is simulated by launching a projectile from a two-stage light gas gun dynamic high-pressure experimental platform, and a target body is arranged in the target chamber of the two-stage light gas gun as a collision object of the projectile, so as to simulate the impact behavior of the rocket sled slide on the track. The purpose of the present invention is to verify in the laboratory whether coating on the track has an inhibitory effect on the occurrence of chiseling in the hypersonic rocket sled test. The completion of the present invention can provide guidance for the coating work of the hypersonic rocket sled test track, improve the test efficiency, and ensure the test success rate.

[0036] like Figure 1 As shown, the present invention is implemented by the following technical solution, which specifically includes the following steps:

[0037] 1) According to the muzzle diameter and target chamber size of the two-stage light gas gun, the projectile and target body are processed by CNC machine tools to ensure good parallelism and flatness. The material of the processed projectile is the rocket sled 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) Make a bracket for supporting and placing the target body, and fix the bracket to the base built into the target chamber by bolts.

[0039] 3) Make a protective tube placed at the end of the target body to prevent the projectiles that may fly out of the target body from hitting the target chamber. A high-pressure polyethylene cylinder of a certain thickness is placed in the protective tube to recover the projectiles that may fly out of the target body and carry 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 between the projectile and the target. 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 conduct.

[0041] 5) Take the uncoated target and install it on the bracket.

[0042] 6) A magnetic velocity measuring device is arranged at the exit of the second-stage light gas gun launch tube to measure the impact velocity between the projectile and the target.

[0043] 7) By adjusting the mass of hydrogen and oxygen in the secondary light gas gun explosion chamber, the impact velocity v of the projectile on the target is set.

[0044] 8) Conduct an uncoated target test, recorded as Test 1.

[0045] 9) Recovering the target body subjected to high-speed impact in step 8).

[0046] 10) Place protective coating in a container, immerse the target completely in the coating for n minutes, take out the target and place it vertically in a cool and ventilated place until the coating is completely dry.

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

[0048] 12) Repeat step 7).

[0049] 13) Conduct a test on a coated target, recorded as Test 2.

[0050] 14) Recovering the target body subjected to high-speed impact in step 13).

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

[0052] Example:

[0053] The ability of epoxy resin-based coating to inhibit gouging damage to U71Mn rocket sled track was verified when the 30CrMnSiNi2A skid of the rocket sled hit 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.

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

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

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

[0058] Step 5: Take the uncoated target and install it on the bracket.

[0059] Step 6: Arrange a magnetic velocity measuring device at the exit of the second-stage light gas gun launch tube to measure the impact velocity between the projectile and the target.

[0060] Step 7: By adjusting the mass of hydrogen and oxygen in the secondary light gas gun explosion chamber, set the impact speed of the projectile on the target to 5Ma.

[0061] Step 8: Conduct an uncoated target test, recorded as Test 1.

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

[0063] Step 10: Put epoxy resin-based paint into the container, immerse the target completely in the paint for 3 minutes, take out the target and place it vertically in a cool and ventilated place until the paint is completely dry.

[0064] Step 11: Take the target body processed in step 10 and install it on the bracket.

[0065] Step 12: Repeat step 7.

[0066] Step 13: Conduct a coated target test, recorded as Test 2.

[0067] Step 14: Recover the target body subjected to high-speed impact in step 13, analyze the test data, and obtain the actual impact velocity.

[0068] Step 15: Recover the target bodies that have been hit by high-speed impact in Experiments 1 and 2, and cut along the axis to find the impact crater. Figure 4 As shown, the impact crater of Test 2 is Figure 5 The impact crater was machined, polished and sampled, and the macroscopic morphology, microstructure and crystal phase structure changes of the impact crater in the two targets were compared and analyzed using scanning electron microscopy, energy spectrum and electron backscatter diffraction technology to determine the protective effectiveness of the coating.

Claims

1. A method for verifying the effectiveness of a track protective coating, characterized in that: The steps include: Step 1: According to the muzzle diameter and target chamber size of the two-stage light gas gun, the projectile and target body are processed by CNC machine tools to ensure parallelism and flatness; Step 2: Make a bracket for supporting and placing the target body, and fix the bracket to the base built into the target chamber by bolts; Step 3: Make a protective tube placed at the end of the target body to prevent the projectiles flying out of the target body from hitting the target chamber; place a high-pressure polyethylene cylinder in the protective tube to recover the projectiles flying out of the target body carrying collision information; Step 4: Adjust the support height of the bracket by adding a gasket between the bracket and the base to adjust the collision angle between the projectile and the target; 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 conduct; Step 5: Take the uncoated target and install it on the bracket; Step 6: Arrange a magnetic velocity measuring device at the exit of the second-stage light gas gun launch tube to measure the impact velocity between the projectile and the target; Step 7: By adjusting the mass of hydrogen and oxygen in the secondary light gas gun explosion chamber, the impact velocity v of the projectile on the target is set; Step 8: Conduct an uncoated target test, recorded as Test 1; Step 9: Recovering the target body subjected to high-speed impact in step 8; Step 10: Put the protective coating into the container, immerse the target completely in the coating for n minutes, take out the target and place it vertically in a cool and ventilated place until the coating is completely dry; Step 11: Take the target body processed in step 10 and install it on the bracket; Step 12: Repeat step 7; Step 13: Conduct a coated target test, recorded as Test 2; Step 14: Recovering the target body subjected to high-speed impact in step 13; Step 15: Cut the target bodies recovered in step 9 and step 13 along the axis to find the impact crater, machine the impact crater, polish it and prepare samples, use scanning electron microscopy, energy spectrum and electron backscatter diffraction technology to compare and analyze the macroscopic morphology, microstructure and crystal phase structure changes of the impact craters in the two targets to determine the protective effectiveness of the coating.

2. A method for verifying the effectiveness of a track protective coating according to claim 1, characterized in that: The processing material of the projectile is the material of the rocket sled slide shoe, and the shape of the projectile is a solid cylinder.

3. A method for verifying the effectiveness of a track protective 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. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 3.

5. An electronic device, characterized in that: include: Processor and 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 method as claimed in any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

7. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 3.

8. A computer program product, characterized in that The computer program product comprises a computer storage medium storing a computer program, wherein the computer program comprises instructions executable by at least one processor, and when the instructions are executed by the at least one processor, the method according to any one of claims 1 to 3 is implemented.

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