Method for verifying the chiseling ability of epoxy zinc-rich primer for protecting rocket sled rails

Abstract

The application discloses a kind of verification methods suitable for epoxy zinc-rich primer protection rocket sled slide rail gouging ability, build rocket sled slide rail gouging protection laboratory simple platform, by reducing hypersonic rocket sled test shoe rail system gouging occurrence condition, in the same condition of gouging occurrence, utilize secondary light gas gun to the slide shoe material 30CrMnSiNi2A sample power is sprayed epoxy zinc-rich primer bainite steel plate and the bainite steel plate without spraying epoxy zinc-rich primer is carried out high-speed oblique impact, and the anti-gouging performance of epoxy zinc-rich primer is verified.The method of the application can reduce laboratory rocket sled slide rail gouging phenomenon with smaller cost, and verify the protection effect of epoxy zinc-rich primer.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rockets, and particularly relates to a method for verifying the chipping resistance of an epoxy zinc-rich primer for protecting a rocket sled rail. BACKGROUND

[0002] Rocket sled testing is a kind of high-dynamic ground testing between laboratory testing and flight testing. Rocket engine is used as power to slide along a high-precision rail at high speed to simulate the speed, overload, mechanical environment and other conditions required by a test product in an actual flight process, so as to check the dynamic warhead matching, structural strength, charge stability and damage efficiency of a weapon system. With the current rapid update and iteration of weapon systems, rocket sled testing is gradually moving towards the hypersonic stage. However, with the continuous increase of the speed of the rocket sled, the mechanical environment between the shoe rail is more severe and complex. When the speed of the sled is close to the hypersonic speed, the high-speed impact between the shoe rail may cause the "raindrop type" or "spindle type" chipping damage on the rail. The occurrence of chipping damage will cause further deterioration of the mechanical environment between the shoe rail, and severe chipping damage may cause the rail to break and the test to fail. Therefore, only by solving the occurrence of chipping damage or mitigating the degree of chipping damage, can the successful implementation of the hypersonic rocket sled test be further ensured.

[0003] Through the search of the prior art documents, it is found that the United States uses an epoxy zinc-rich primer as a protective coating for the rocket sled rail to reduce the probability of chipping damage of the rocket sled rail during the hypersonic rocket sled test. However, the chipping resistance of the epoxy zinc-rich primer for protecting the rocket sled rail has not been verified. The cost of the hypersonic rocket sled test is high, and it is not realistic to completely verify the chipping resistance of the epoxy zinc-rich primer for protecting the rocket sled rail through the rocket sled test. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the application provides a method for verifying the chipping resistance of an epoxy zinc-rich primer for protecting a rocket sled rail. A simple platform for chipping protection of a rocket sled rail is built, and a high-speed oblique impact is provided on a bainite steel plate sprayed with an epoxy zinc-rich primer and a bainite steel plate not sprayed with an epoxy zinc-rich primer by a two-stage light gas gun under the same chipping condition of the high-speed rocket sled test, so as to verify the chipping resistance of the epoxy zinc-rich primer. The method can reproduce the chipping phenomenon of the rocket sled rail in the laboratory at a low cost, and verify the protective effect of the epoxy zinc-rich primer.

[0005] The technical solution adopted by the application to solve the technical problems is as follows:

[0006] Step 1: Use the two-stage light gas gun high-pressure test platform as a high-speed launching device to make the projectile sample fly out from the exit end of the launch tube at a speed of several thousand meters per second.

[0007] Step 2: Place the magnetic velocity measuring device at the exit of the secondary light gas gun's launch tube to measure the impact velocity of the projectile against the target. As the projectile passes through the magnetic ring and coil inside the magnetic velocity measuring device, eddy currents and secondary magnetic fields are formed on its surface, which in turn generate an induced electromotive force. Use an oscilloscope to record the history of the electromotive force changes throughout the process. Read the induced electrical signal pulses generated when the projectile passes through the coils in sequence from the oscilloscope, that is, the time difference Δt when the projectile passes through the coils at different positions. The center distance S of the different coils is a fixed value, so the projectile velocity is w = S / Δt.

[0008] Step 3: A closed cavity made of bainitic steel is used as the recovery box to house the test steel plate, capture bullets after impact with the target, and provide safety protection; the recovery box has an opening on the side near the barrel of the secondary light gas gun for bullet entry;

[0009] Step 4: In the recovery box in Step 3, fix the test target plate and adjust the relative height between the front and rear corner codes to determine the collision angle; by adjusting the angle between the test target plate and the horizontal plane, simulate the chiseling phenomenon, and at this angle, the projectile impacts the inclined target plate to restore the small-angle inclined collision slide rail of the rocket skid track system.

[0010] Step 5: After determining the impact angle and velocity, conduct comparative tests. Under the same launch velocity and angle, use projectiles to impact the target plate coated with epoxy zinc-rich primer. Compare the damage of the slide rail target with and without epoxy resin base coating under the same conditions, and test the impact velocity of the projectile on the target plate. Observe the influence of epoxy zinc-rich primer on the deformation and failure mode of bainitic target plate under different working conditions.

[0011] Step 6: Analyze the damage mode and microstructure of the inner wall of the target using electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electron backscatter diffraction (EBSD) to qualitatively and quantitatively analyze the performance of the epoxy zinc-rich primer coating in protecting against guide rail chiseling damage.

[0012] Preferably, the projectile material is 30CrMnSiNi2A steel, and the projectile size is a cuboid with a length * width * height of 25mm * 4mm * 3mm.

[0013] Preferably, the thickness of the bainitic steel is 25 mm.

[0014] A computer program that causes a computer to perform the above-described verification method.

[0015] 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.

[0016] A computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the above verification method.

[0017] A chip, comprising: a processor, used to call and run a computer program from a memory, so that a device installed with the chip executes the above verification method.

[0018] A computer program product, comprising a computer storage medium, the computer storage medium stores a computer program, the computer program includes instructions executable by at least one processor, when the instructions are executed by the at least one processor, the above verification method is implemented.

[0019] The beneficial effects of the present application are as follows:

[0020] The method is a verification method suitable for verifying the chiseling ability of the epoxy zinc-rich primer for protecting the rocket sled slide rail. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the experimental device of the epoxy zinc-rich primer for protecting the rocket sled slide rail according to the method.

[0022] Figure 2 The figure is a typical signal diagram of the metal projectile passing through the magnetic speed measurement according to the embodiment of the present application.

[0023] Figure 3 The figure is a SEM planar morphology at a speed of 1.8 km / s according to the embodiment of the present application.

[0024] Figure 4 The figure is a SEM planar morphology at a speed of 1.6 km / s according to the embodiment of the present application.

[0025] Figure 5 The figure is an OM cross-sectional morphology according to the embodiment of the present application.

[0026] Figure 6 The figure is a SEM cross-sectional morphology according to the embodiment of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS: 1 - bullet drag, 2 - aluminum alloy base, 3 - metal long rod, 4 - oscilloscope, 5 - magnetic speed measurement device, 6 - recovery box, 7 - test steel plate #1, 8 - test steel plate #2, 9 - box body fixing hole, 10 - corner code, 11 - two-stage light gas gun launch tube. DETAILED DESCRIPTION

[0028] The application is further illustrated below in conjunction with the accompanying drawings and examples.

[0029] The present application aims to solve the above problems in the prior art and provides a method for verifying the chipping resistance of an epoxy zinc-rich primer, which is low in cost, simple to operate and suitable for protecting rocket sled rail chipping.

[0030] The application adopts the following technical solutions:

[0031] A method for verifying the chipping resistance of an epoxy zinc-rich primer, comprising the following steps:

[0032] Step 1: Use the two-stage light gas gun dynamic high-pressure experiment platform as a high-speed launching device to make the projectile sample fly out of the outlet end of the launching tube at a speed of several kilometers per second.

[0033] To effectively simulate the super-speed collision conditions between the shoe rail system and adapt to the two-stage light gas gun dynamic high-pressure experiment platform, the projectile material is selected to be 30CrMnSiNi2A steel, and the projectile size is a cuboid with a length of 25 mm, a width of 4 mm and a height of 3 mm.

[0034] Step 2: Place the magnetic speed measuring device at the outlet of the two-stage light gas gun launching tube to measure the impact speed of the projectile and the target body.

[0035] Step 3: Use a closed cavity enclosed by a 25mm-thick bainite steel as a recovery box for placing the test steel plate, capturing the bullet after collision and providing safety protection. The recovery box is opened near the side of the two-stage light gas gun barrel for bullet incidence.

[0036] Step 4: In the recovery box in step three, fix the test target plate at a certain angle and adjust the relative height between the front and rear angle codes to determine the collision angle. By adjusting the angle between the test target plate and the horizontal plane, the chipping phenomenon is simulated, and the projectile impacts the inclined target plate at the angle to reproduce the small-angle inclined collision of the shoe rail system of the rocket sled.

[0037] Step 5: After determining the impact angle and speed, comparative tests are carried out, and the projectile is used to impact the target plate coated with the epoxy zinc-rich primer at the same launch speed and angle. The damage of the sliding rail target body with and without the epoxy resin coating under the same conditions is compared, and the impact speed of the projectile and the target plate is tested. The influence of the epoxy zinc-rich primer on the deformation and damage mode of the bainite target plate under different working conditions is observed.

[0038] Step 6: The damage mode and micro-morphology of the inner wall of the target body are analyzed by techniques such as electron microscope SEM, energy spectrometer EDS, and electron backscatter diffraction EBSD, and the performance of the epoxy zinc-rich primer coating in protecting the sliding rail from gouging damage is qualitatively and quantitatively analyzed.

[0039] Embodiment:

[0040] The problem to be solved by the present application is to provide a verification method for the gouging protection capability of the epoxy zinc-rich primer for the rocket sled sliding rail, which overcomes the deficiency that the gouging protection capability of the epoxy zinc-rich primer for the rocket sled sliding rail cannot be determined at present. The method builds a low-cost laboratory device for testing the gouging protection performance of the epoxy zinc-rich primer for the rocket sled sliding rail, and verifies the gouging protection capability of the epoxy zinc-rich primer for the rocket sled sliding rail by using the control variable method.

[0041] Step 1: The two-stage light gas gun high-pressure experimental platform is used as a high-speed launch device, and the solid metal rectangular projectile is made of 30CrMnSiNi2A steel, which is used to simulate the high-speed moving rocket sled sliding shoe.

[0042] The solid metal rectangular rod has a length* width* height of 25mm*4mm*3mm. The projectile is composed of two parts, a PEEK material made of a solid metal rectangular rod made of 30CrMnSiNi2A steel.

[0043] Step 2: Control the impact speed of the metal rectangular projectile and the test target. The two-stage light gas gun uses low-density light gas (such as hydrogen and helium) as the working gas, and adjusts the content and proportion of hydrogen and oxygen in the gas chamber and the pressure of the light working gas in the pump pipe to continuously drive the projectile, so as to accurately control the impact speed of the projectile.

[0044] Step 3: Place the magnetic speed measuring device at the outlet of the two-stage light gas gun launch tube to measure the impact speed of the projectile. After the projectile flies out of the muzzle, it flies a certain distance to enter the uniform motion stage after the pushing effect of the compressed gas is removed. When the projectile passes through the magnetic ring and coil in the magnetic speed measuring device, eddy current and secondary magnetic field are formed on the surface of the projectile, and then induced electromotive force is generated. The oscilloscope records the change history of the electromotive force in the whole process. The induced electric signal pulse formed when the projectile successively flies through the coil is read from the oscilloscope, that is, the time difference At when the projectile passes through different position coils. The center distance S of different coils is a fixed value, so the speed of the projectile is w=S / At.

[0045] Step 4: The closed cavity surrounded by bainite steel plates with a thickness of 25 mm is used as a recovery box for placing the test steel plate, capturing the bullet after impact, and safety protection. The recovery box is opened near the side of the secondary light gas gun barrel for bullet incidence.

[0046] The recovery box is composed of a front protective plate, a rear protective plate, a side protective plate, an upper protective plate, and a bottom protective plate. The front protective plate is located near the light gas gun launch tube side and has a 10 mm diameter hole in the center for the solid long rod to pass through. The rear protective plate is placed away from the light gas gun launch tube side. The upper protective plate is placed on the frame formed by the front protective plate, rear protective plate, and side protective plate. One side of the recovery box is equipped with a loose leaf, handle, and fastening device. The recovery box can be used as a bullet recovery box and as a secondary verification of the protective performance of the epoxy zinc-rich primer.

[0047] Step 5: In the recovery box in step three, the test target plate is fixed, and the relative height of the corner codes can be adjusted to determine the impact angle by adjusting the relative height between the front and rear corner codes. The length, width, and thickness of the test target plate are about 600 mm, 400 mm, and 20 mm, respectively. By adjusting the angle between the impact plate and the bullet, the chiseling phenomenon is simulated, and the bullet impacts the inclined target plate at this angle to reproduce the small-angle inclination impact of the rocket sled shoe rail system to verify the anti-chiseling protective performance of the epoxy zinc-rich primer.

[0048] Step 6: Fix the impact angle and conduct a set of 0 experiments. The 0 experiment has the same conditions as the A group experiment, and the purpose is to test the stability and reliability of the designed device. The control (A group) test design is as follows: both test target plates are not sprayed with epoxy zinc-rich primer.

[0049] The comparison (B group, C group, D group) test design is as follows:

[0050] B group: No. 1 bainite target plate is sprayed with epoxy zinc-rich primer, and the thickness of the epoxy zinc-rich primer is 1 mm. No. 2 target plate is not sprayed with epoxy zinc-rich primer.

[0051] C group: No. 1 bainite target plate is not sprayed with epoxy zinc-rich primer, and No. 2 target plate is sprayed with epoxy zinc-rich primer with a thickness of 1 mm.

[0052] D group: No. 1 bainite target plate and No. 2 target plate are both sprayed with epoxy zinc-rich primer with a thickness of 1 mm.

[0053] Table 1 Test Conditions Table

[0054] Test No. 1st Steel Panel 2nd Steel Panel 0th Test Epoxy-free zinc-rich primer Epoxy-free zinc-rich primer Group A Test Epoxy-free zinc-rich primer Epoxy-free zinc-rich primer Group B Test 1 mm epoxy zinc-rich primer Epoxy-free zinc-rich primer Group C Test Epoxy-free zinc-rich primer 1 mm epoxy zinc-rich primer Group D Test 1 mm epoxy zinc-rich primer 1 mm epoxy zinc-rich primer

[0055] As shown in Table 1, four groups of test conditions, at the same launch speed, using the projectile to spray epoxy zinc-rich primer target plate impact test, and test the impact speed of the projectile and target plate, under different conditions, the influence of the sprayed epoxy zinc-rich primer on the deformation and failure mode of the bainite target plate was observed.

[0056] Step 7: The failure mode and micro-morphology of the inner wall of the target body were analyzed by electron microscopy SEM, electron backscattering diffraction EBSD and other techniques, and the performance of the epoxy zinc-rich primer coating in preventing the damage of the sliding rail was qualitatively and quantitatively analyzed.

Claims

1. A method for verifying the chiseling capability of epoxy zinc-rich primer-protected rocket sled rails, characterized in that, Comprise the following steps: Step 1: The secondary light gas gun high pressure experiment platform is used as a high-speed launching device, and the projectile sample is launched from the outlet end of the launching tube at a speed of thousands of meters per second; Step 2: A magnetic speed measuring device is placed at the outlet of the secondary light gas gun launching tube for measuring the impact speed of the projectile and the target plate; the projectile passes through the magnetic ring and coil in the magnetic speed measuring device, and eddy current and secondary magnetic field are formed on the surface, thereby generating induced electromotive force, and the oscilloscope is used to record the change history of the electromotive force during the whole process; the induced electric signal pulse formed when the projectile successively flies through the coil is read from the oscilloscope, that is, the time difference Δt when the projectile passes through the coils at different positions, and the center distance S of different coils is a fixed value, so the speed of the projectile is w=S / Δt; Step 3: A closed cavity enclosed by bainite steel is used as a recovery box for placing the test target plate, capturing the projectile after hitting the target plate, and safety protection; the recovery box is opened near the side of the secondary light gas gun barrel for projectile incidence; Step 4: In the recovery box in step 3, the test target plate is fixed, and the relative height between the front and rear angle codes is adjusted to determine the collision angle; by adjusting the angle between the test target plate and the horizontal plane, the gouging phenomenon is simulated, and the projectile hits the inclined target plate at this angle to restore the small-angle inclined collision rail of the rocket sled shoe rail system; Step 5: After determining the impact angle and speed, comparative tests are carried out, and the projectile is used to impact the target plate coated with epoxy zinc-rich primer under the same launching speed and angle; the damage of the target plate with and without epoxy zinc-rich primer coating under the same conditions is compared, and the impact speed of the projectile and the target plate is tested; the influence of epoxy zinc-rich primer on the deformation and damage mode of bainite target plate under different working conditions is observed; Step 6: The damage mode and micro-morphology of the inner wall of the target plate are analyzed by SEM, EDS and EBSD, and the performance of the epoxy zinc-rich primer coating in protecting the gouging damage of the rail is qualitatively and quantitatively analyzed.

2. The method for verifying the chipping resistance of the epoxy zinc-rich primer applied to the rocket sled rail according to claim 1, characterized in that, The projectile material is 30CrMnSiNi2A steel, and the projectile size is a cuboid with a length of 25mm, a width of 4mm and a height of 3mm.

3. The method for verifying the gouging ability of the epoxy zinc-rich primer for protecting the rocket sled rail according to claim 1, wherein, The bainite steel has a thickness of 25mm.

4. An electronic device, comprising: Comprise: 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 Comprise: A processor is used to call and run 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, and when the instructions are executed by the at least one processor, the method of any one of claims 1 to 3 is implemented.

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