Verification method suitable for chipping capability of sliding rail of epoxy zinc-rich primer protection rocket sled

Abstract

The invention discloses a verification method suitable for the chiseling capability of an epoxy zinc-rich primer protection rocket sled slide rail, and the method comprises the steps: building a rocket sled slide rail chiseling protection laboratory simple platform, and restoring the chiseling occurrence working condition of a hypersonic velocity rocket sled test shoe rail system; under the same working condition of chiseling, a secondary light gas gun is used for providing power for a sliding shoe material 30CrMnSiNi2A sample to carry out high-speed inclined impact on the bainite steel plate sprayed with the epoxy zinc-rich primer and the bainite steel plate not sprayed with the epoxy zinc-rich primer, and the chiseling resistance of the epoxy zinc-rich primer is verified. According to the method, the chipping phenomenon of the rocket sled sliding rail in a laboratory can be reduced with low cost, and the protection effect of the epoxy zinc-rich primer is verified.

Description

Technical Field

[0001] The invention belongs to the field of rocket technology, and in particular relates to a verification method for the chiseling ability of a slide rail of a rocket sled protected by an epoxy zinc-rich primer. Background Art

[0002] The rocket sled test is a ground high-dynamic test between laboratory tests and flight tests. It uses rocket engines as power and slides along high-precision slide rails at high speed to simulate the speed, overload, mechanical environment and other conditions required by the test object during actual flight. It is used to assess the dynamic ignition and warhead matching, structural strength, charge stability and damage effectiveness of weapons and equipment. With the rapid update and iteration of current weapon and equipment systems, rocket sled tests are gradually moving towards the hypersonic stage. However, with the continuous increase in the speed of the rocket sled, the mechanical environment between the shoe rails has become more severe and complex. When the sled vehicle speed approaches hypersonic speed, the hypersonic impact between the shoe rails may cause "raindrop-shaped" or "spindle-shaped" chiseling damage on the slide rails. The occurrence of chiseling damage will cause further deterioration of the mechanical environment between the shoe rails, and may cause the slide rail to break and the test to fail. Therefore, only by solving the occurrence of chiseling damage or alleviating the degree of chiseling damage can the successful implementation of the hypersonic rocket sled test be further guaranteed.

[0003] After searching the existing technical literature, it was found that when the United States conducted hypersonic rocket sled tests, it used epoxy zinc-rich primer as a protective coating for the rocket sled rails to protect the rails and reduce the probability of gouging damage to the rocket sled rails. However, the ability of epoxy zinc-rich primer to protect the rocket sled rails from gouging was not verified. The cost of hypersonic rocket sled tests is expensive, and it is unrealistic to verify the ability of epoxy zinc-rich primer to protect the rocket sled rails from gouging through rocket sled tests. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a verification method for the chiseling ability of the rocket sled rail protected by epoxy zinc-rich primer, builds a simple platform for the chiseling protection laboratory of the rocket sled rail, restores the chiseling conditions of the hypersonic rocket sled test shoe rail system, and uses a two-stage light gas gun to provide power to the shoe material 30CrMnSiNi2A sample under the same conditions where chiseling occurs to perform high-speed oblique impact on the bainitic steel plate sprayed with epoxy zinc-rich primer and the bainitic steel plate not sprayed with epoxy zinc-rich primer, so as to verify the anti-chiseling performance of the epoxy zinc-rich primer. The method of the present invention can restore the chiseling phenomenon of the rocket sled rail in the laboratory at a relatively low cost, and verify the protective effect of the epoxy zinc-rich primer.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] Step 1: Use the two-stage light gas gun dynamic high-pressure experimental platform as a high-speed launch 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 a magnetic velocity measuring device at the exit of the secondary light gas gun launch tube to measure the impact speed between the projectile and the target; when the projectile passes through the magnetic ring and coil in the magnetic velocity measuring device, eddy currents and secondary magnetic fields are formed on the surface, thereby generating an induced electromotive force. Use an oscilloscope to record the change history of the electromotive force during the whole process; read the induced electrical signal pulses formed when the projectile flies through the coil 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 different coils is a fixed value, and the projectile speed is w=S / Δt;

[0008] Step 3: A closed cavity surrounded by bainite steel is used as a recovery box to place the test steel plate, capture the bullet after hitting the target and provide safety protection; the recovery box is opened on one side of the secondary light gas gun barrel for bullet injection;

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

[0010] Step 5: After determining the impact angle and speed, conduct a comparative test. At the same launch speed and angle, use a projectile to conduct an impact test on the target plate sprayed with epoxy zinc-rich primer. Compare the damage of the slide rail target body sprayed with and without epoxy resin-based coating under the same conditions, and test the impact speed of the projectile and the target plate; observe the influence of epoxy zinc-rich primer on the deformation and failure mode of bainite target plate under different working conditions;

[0011] Step 6: Analyze the damage mode and microstructure of the inner wall of the target body through electron microscope SEM, energy dispersive spectrometer EDS and electron backscatter diffraction EBSD, and qualitatively and quantitatively analyze the performance of epoxy zinc-rich primer coating in protecting the slide rail from gouging damage.

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

[0013] Preferably, the bainite steel has a thickness of 25 mm.

[0014] A computer program enables a computer to execute the above verification method.

[0015] 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.

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

[0017] 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.

[0018] 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.

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

[0020] The method of the invention is a verification method suitable for the chiseling ability of epoxy zinc-rich primer to protect rocket sled slide rails. The chiseling phenomenon of laboratory rocket sled slide rails is restored at a relatively low cost, and the protective effect of the epoxy zinc-rich primer is verified. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic diagram of an experimental device for protecting rocket sled rails from chiseling using epoxy zinc-rich primer according to the method of the present invention.

[0022] Figure 2 Schematic diagram of typical signals of a metal projectile passing through magnetic velocity measurement according to an embodiment of the present invention.

[0023] Figure 3 This is the SEM plane morphology of the embodiment of the present invention at a speed of 1.8 km / s.

[0024] Figure 4 This is the SEM plane morphology of the embodiment of the present invention at a speed of 1.6 km / s.

[0025] Figure 5 This is the OM cross-section morphology of the embodiment of the present invention - metallographic corrosion.

[0026] Figure 6 This is the SEM cross-sectional morphology of an embodiment of the present invention.

[0027] Description of the drawings: 1-bullet drag, 2-aluminum alloy base, 3-metal long rod, 4-oscilloscope, 5-magnetic speed measuring device, 6-recovery box, 7-test steel plate #1, 8-test steel plate #2, 9-box fixing hole, 10-angle code, 11-second-stage light gas gun launching tube. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] The present invention aims to solve the deficiencies of the above-mentioned prior art and to provide a method for verifying the chiseling ability of a rocket sled rail protected by an epoxy zinc-rich primer, which is low-cost and easy to operate. A simple platform for a rocket sled rail chiseling protection laboratory is built, and the chiseling conditions of the hypersonic rocket sled test shoe rail system are restored. Under the same conditions where chiseling occurs, a two-stage light gas gun is used to provide power to a 30CrMnSiNi2A sample of the shoe material to perform high-speed oblique impact on a bainitic steel plate sprayed with an epoxy zinc-rich primer and a bainitic steel plate not sprayed with an epoxy zinc-rich primer, thereby verifying the anti-chiseling performance of the epoxy zinc-rich primer.

[0030] The present invention adopts the following technical solutions:

[0031] A verification method for the chiseling ability of a rocket sled rail protected by epoxy zinc-rich primer comprises the following steps:

[0032] Step 1: Use the two-stage light gas gun dynamic high-pressure experimental platform as a high-speed launch 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.

[0033] In order to effectively simulate the ultra-high-speed collision conditions between the shoe-rail system and adapt to the two-stage light gas gun dynamic high-pressure experimental platform, the projectile material is 30CrMnSiNi2A steel, and the projectile size is a rectangular parallelepiped with a length*width*height of 25mm*4mm*3mm respectively.

[0034] Step 2: Place the 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.

[0035] Step 3: A closed cavity surrounded by 25mm thick bainitic steel is used as a recovery box to house the test steel plate, capture the bullet after hitting the target, and provide safety protection. The recovery box has a hole near the side of the secondary light gas gun barrel for bullet injection.

[0036] Step 4: In the recovery box in step 3, 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 chiseling phenomenon is simulated, and the projectile hits the inclined target plate at this angle to restore the small-angle inclined collision slide of the rocket sled rail system.

[0037] Step 5: After determining the impact angle and speed, conduct a comparative test. At the same launch speed and angle, use a projectile to impact the target plate sprayed with epoxy zinc-rich primer, compare the damage of the slide rail target body sprayed with and without epoxy resin-based coating under the same conditions, and test the impact speed of the projectile and the target plate. Observe the effect of epoxy zinc-rich primer on the deformation and failure mode of bainite target plate under different working conditions.

[0038] Step 6: Analyze the damage mode and microscopic morphology of the inner wall of the target body through electron microscope SEM, energy dispersive spectrometer EDS and electron backscatter diffraction EBSD, and qualitatively and quantitatively analyze the performance of epoxy zinc-rich primer coating in protecting the slide rail from gouging damage.

[0039] Example:

[0040] The problem to be solved by the present invention is that it is currently impossible to determine the protective ability of epoxy zinc-rich primer against the gouging of rocket sled rails, and a verification method suitable for the gouging ability of epoxy zinc-rich primer for protecting rocket sled rails is provided. The method verifies the gouging ability of epoxy zinc-rich primer for protecting rocket sled rails by building a low-cost laboratory device for the gouging performance of epoxy zinc-rich primer for protecting rocket sled rails, and adopts a controlled variable method.

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

[0042] The length, width and height of the solid metal rectangular rod are 25mm*4mm*3mm respectively. The projectile consists of two parts, a projectile made of polyetheretherketone (PEEK) material and a solid metal rectangular rod made of 30CrMnSiNi2A steel.

[0043] Step 2: Control the impact speed of the metal rectangular projectile with the test target. The two-stage light gas gun uses low-density light gas (such as hydrogen and helium) as the working gas. By adjusting the content and ratio of hydrogen and oxygen in the gas chamber and the pressure of the light working gas in the pump tube, the projectile is continuously driven to achieve precise control of the projectile's impact speed.

[0044] Step 3: Place the magnetic velocity measuring device at the exit of the second-stage light gas gun launch tube to measure the impact velocity of the projectile. After the projectile flies out of the muzzle, let it fly a certain distance to remove the driving force of the compressed gas and enter the uniform motion stage. The projectile passes through the magnetic ring and coil in the magnetic velocity measuring device, and eddy currents and secondary magnetic fields are formed on the surface, which in turn generate induced electromotive force. The oscilloscope records the change history of the electromotive force during the whole process. The induced electrical signal pulses formed when the projectile flies through the coil in sequence are read from the oscilloscope, that is, the time difference Δt when the projectile passes through the coils at different positions. The center distance S of different coils is a fixed value, and the projectile speed is w=S / Δt.

[0045] Step 4: A closed cavity enclosed by 25 mm thick bainite steel plates is used as a recovery box to house the test steel plates, capture the bullets after hitting the target, and provide safety protection. The recovery box has a hole near the side of the secondary light gas gun barrel for bullet injection.

[0046] The recycling box consists 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 cannon launch tube, and a hole with a diameter of 10 mm is opened in the center for the solid long rod to pass through; the rear protective plate is placed on the side away from the light gas cannon launch tube; the upper protective plate is placed on a frame formed by the front protective plate, the rear protective plate, and the side protective plates. A hinge, a handle, and a fastening device are installed on one side of the recycling box. The recycling box can be used as a recycling box for bullets and can also be used to verify the protective performance of the epoxy zinc-rich primer for a second time.

[0047] Step 5: In the recovery box in step 3, fix the test target plate, whose relative height of the angle code is adjustable, and determine the collision angle by adjusting the relative height between the front and rear angle codes. The length, width and thickness of the test target plate are approximately 600mm, 400mm and 20mm. By adjusting the angle between the impact plate and the projectile, the chiseling phenomenon is simulated, and the projectile hits the inclined target plate at this angle to restore the small-angle inclined collision of the rocket sled shoe rail system to verify the anti-chise protection performance of the epoxy zinc-rich primer.

[0048] Step 6: Fix the impact angle and conduct a group of experiments No. 0. The conditions of experiment No. 0 are the same as those of group A. The purpose is to test the stability and reliability of the designed device. The design of the control (group A) experiment is: neither of the two test target plates is sprayed with epoxy zinc-rich primer.

[0049] The design of the comparative (group B, group C, group D) experiment is as follows:

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

[0051] Group C: 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, and the thickness of epoxy zinc-rich primer is 1mm;

[0052] Group D: Both No. 1 bainite target plate and No. 2 target plate are sprayed with epoxy zinc-rich primer, and the thickness of the epoxy zinc-rich primer is 1 mm.

[0053] Table 1 Test conditions

[0054] Test No. No. 1 steel plate No. 2 steel plate Test No. 0 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 1mm epoxy zinc-rich primer Epoxy-free zinc-rich primer Group C trial Epoxy-free zinc-rich primer 1mm epoxy zinc-rich primer Group D test 1mm epoxy zinc-rich primer 1mm epoxy zinc-rich primer

[0055] As shown in Table 1, four groups of test conditions, at the same launch speed, use projectiles to carry out impact tests on target plates sprayed with epoxy zinc-rich primers, and test the impact speed between the projectiles and the target plates to observe the influence of spraying epoxy zinc-rich primers on the deformation and failure mode of bainite target plates under different working conditions.

[0056] Step 7: Analyze the damage mode and microscopic morphology of the inner wall of the target body through electron microscope SEM, electron backscatter diffraction EBSD and other technologies, and qualitatively and quantitatively analyze the performance of the epoxy zinc-rich primer coating in protecting the slide rail from gouging damage.

Claims

1. A method for verifying the chiseling ability of a rocket sled rail protected by epoxy zinc-rich primer, characterized in that: The steps include: Step 1: Use the two-stage light gas gun dynamic high-pressure experimental platform as a high-speed launch 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; Step 2: Place a magnetic velocity measuring device at the exit of the secondary light gas gun launch tube to measure the impact speed between the projectile and the target; when the projectile passes through the magnetic ring and coil in the magnetic velocity measuring device, eddy currents and secondary magnetic fields are formed on the surface, thereby generating an induced electromotive force. Use an oscilloscope to record the change history of the electromotive force during the whole process; read the induced electrical signal pulses formed when the projectile flies through the coil 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 different coils is a fixed value, and the projectile speed is w=S / Δt; Step 3: A closed cavity surrounded by bainite steel is used as a recovery box to place the test steel plate, capture the bullet after hitting the target and provide safety protection; the recovery box is opened on one side of the secondary light gas gun barrel for bullet injection; Step 4: In the recovery box in step 3, fix the test target plate, adjust the relative height between the front and rear angle codes to determine the collision angle; simulate the chiseling phenomenon by adjusting the angle between the test target plate and the horizontal plane, and at this angle, the projectile hits the inclined target plate to restore the small-angle inclined collision slide rail of the rocket sled shoe rail system; Step 5: After determining the impact angle and speed, conduct a comparative test. At the same launch speed and angle, use a projectile to conduct an impact test on the target plate sprayed with epoxy zinc-rich primer. Compare the damage of the slide rail target body sprayed with and without epoxy resin-based coating under the same conditions, and test the impact speed of the projectile and the target plate; observe the influence of epoxy zinc-rich primer on the deformation and failure mode of bainite target plate under different working conditions; Step 6: Analyze the damage mode and microstructure of the inner wall of the target body through electron microscope SEM, energy dispersive spectrometer EDS and electron backscatter diffraction EBSD, and qualitatively and quantitatively analyze the performance of epoxy zinc-rich primer coating in protecting the slide rail from gouging damage.

2. A verification method for the chiseling ability of a rocket sled rail protected by epoxy zinc-rich primer according to claim 1, characterized in that: The projectile is made of 30CrMnSiNi2A steel, and the projectile is a rectangular parallelepiped with a length*width*height of 25mm*4mm*3mm respectively.

3. A verification method for the chiseling ability of a rocket sled rail protected by epoxy zinc-rich primer according to claim 1, characterized in that: The thickness of the bainite steel is 25 mm.

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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