Thermal vibration composite aging-based shape regulation and control device for large-scale aerospace ring-column-shaped thin-wall structure product

Abstract

The invention designs a thermal vibration composite aging-based shape regulation and control device for a large-scale aerospace ring-column-shaped thin-wall structure product, and aims to solve the key problems of concentrated residual stress distribution, large outline out-of-tolerance, short service life and the like of the large-scale aerospace carrier ring-column-shaped thin-wall product. The device mainly comprises a vibration aging system, a thermal aging system, a bidirectional movement system and an automatic control system. Wherein the maximum working diameter phi of the cylindrical heating box body is 1.5 m, and the height of the cylindrical heating box body is 1.8 m; the lifting height is 2.5 m, and the transverse translation length of the platform is 2.0 m; the range of the excitation force is 500-10000 N, and the range of the excitation frequency is 10-200 Hz; the temperature setting range is 23-300 DEG C, and the temperature rising rate adjusting range is 1-10 DEG C / min; and the automatic control system can realize automatic control on the system parameters. A thermal aging and vibration aging coupling method can be utilized to homogenize and reduce the distribution of a residual stress field and improve the dimensional precision and performance of a product. The device can realize shape regulation and control process production of metal-composite material key structure products of large spacecrafts, and has the advantages of high precision, high efficiency, convenience in operation and the like.

Description

Technical Field

[0001] The present invention relates to a device for regulating the shape and properties of a large aerospace annular columnar thin-walled structure based on thermal and vibration combined aging. This device can achieve functions such as regulating the shape and properties of key metal-composite structures of large spacecraft, and belongs to the technical field of aerospace manufacturing processes and performance improvement. Background Art

[0002] With the high-quality and rapid development of advanced model equipment in the aerospace field, large annular columnar thin-walled characteristic structure products account for "half of the territory" of the overall equipment. Such products have characteristics such as weak structural rigidity, concentrated stress distribution, and difficult-to-guarantee outer contour. Therefore, it is crucial to develop and produce them with "shape preservation - quality assurance - quantity guarantee". At present, traditional machining methods do not essentially control the residual stress distribution and dimensional accuracy. To solve the above problems, a device for overall shape and property control before finish machining is needed. Combining the technologies of thermal aging, vibration aging, and multi-parameter coupling aging can achieve the purpose of cost saving, production efficiency improvement, comprehensive service performance enhancement of aerospace equipment, and efficient development and production of large key structure products. Summary of the Invention

[0003] The present invention proposes a device for regulating the shape and properties of a large aerospace annular columnar thin-walled structure based on thermal and vibration combined aging, which solves key problems such as concentrated residual stress distribution, large out-of-tolerance of the outer contour, and low service life of large aerospace launch vehicle annular columnar thin-walled products. This device mainly includes: a vibration aging system, a thermal aging system, a two-way motion system, and an automatic control system; the exciting force of the vibration aging system is 500 - 10000 N, and the exciting frequency is 10 - 200 Hz; the temperature setting range of the thermal aging system is 23 - 300 °C, and the heating rate adjustment range is 1 - 10 °C / min; the lifting height of the two-way motion system is 2.5 m, and the horizontal translation length is 2.0 m; the maximum diameter of the cylindrical heating box is φ1.5 m, and the height is 1.8 m; the automatic control system can manage and control the above parameters. The above device can conduct research and production on the shape and property regulation of vibration aging, thermal aging, and vibration-thermal combined aging for large aerospace launch vehicle annular columnar thin-walled products.

[0004] The said two-way motion system includes a frame 14, a lifting servo motor 6, a column 4, a connector 5, a lifting lead screw 9, a lifting sleeve 84, a translation servo motor 12, a translation lead screw 18, a slide rail 13, and a slider 20. The positional relationships among the above components are as Figure 1 shown; the lifting motion system is to lift the cylindrical box assembly ( Figure 3 ) to a set height. Two connectors 5 are symmetrically installed on the box. The connector 5 is fixedly connected to the lifting sleeve 84. The lifting servo motor 6 drives the lifting lead screw 9 to rotate, thereby lifting the entire cylindrical box assembly (Figure 3 ); The translation motion system moves the vibration aging system ( Figure 5 ) by a specific lateral distance. The two ends of the translation lead screw 18 are installed on the bearings at both ends of the frame 14 and are connected to the translation servo motor 12 at the far end; two slide rails 13 are installed on the frame 14 in the same parallel width in the same way. Four sliders 20 are installed at the bottom of the static platform 15, and two sliders on the same side slide on one track; a translation lead screw nut 21 is installed in the middle at the bottom of the static platform and cooperates with the lead screw 18 for lateral translation motion. The lifting motion system and the lateral translation system are independent of each other and do not interfere with each other. Their operation and stop are controlled by the automatic control system.

[0005] The vibration aging system includes an exciter 17, a static platform 15, a vibration platform 16, springs 19, pads 22, a test piece 11, and a fixture assembly 10. The relationship between the components is as shown in Figure 1 and Figure 5 shown; The fixture assembly 10 includes a fixture pull rod 101, an upper clamping nut 102, a lower clamping nut 103, a three-pronged fixture 104, an adjustable diameter bolt hole 105, and an adjustable position bolt 106. The installation relationship is as shown in Figure 4 shown; Six springs 19 are axially arranged and installed on the static platform 15. The top of the spring 19 is bolted to the vibration platform 16. Corresponding pads 22 can be installed on the vibration platform 16 according to the actual height and diameter of the test piece 11. The exciter 17 is clamped on one side of the vibration platform 16; The test piece is a spacecraft product with a ring-shaped thin-walled structure feature, such as the characteristic product shown in Figure 1 , which includes a transition section 11, a load-bearing cylinder 111, a tank bottom 112, a transition ring 113, a shell section 114, and a tail nozzle 115; Place the test piece 11 on the circular moving platform and use the fixture assembly ( Figure 4 ) for clamping. The pull rod 101 is fixedly installed at the center of the bottom vibration platform 16. The upper clamping nut 102 and the lower clamping nut 103 can clamp and install the three-pronged fixture 104 according to the actual height of the test piece; The adjustable position bolt 106 is inserted into the adjustable diameter bolt hole 105 according to the radial dimension of the test piece to realize the positioning and installation of the test piece.

[0006] The thermal aging system includes a cylindrical box body assembly 8, a viewing window 81, a fan 82, a thermocouple 83, and a heating tube 85. The installation relationship is as shown in Figure 3As shown in the figure; the connector of the cylindrical box assembly and the lifting motion system is fixedly installed, a fan 7 is installed on the outer side of the top of the box, and the shaft of the fan 7 is connected to the fan 82; a heating pipe 85 is installed on the inner wall of the cylinder, and 5 thermocouples 83 are distributed around the box, one of which 83 is installed on the top to control the temperature, and the other four 84 are installed around the bottom to measure the temperature near the aging sample, playing a role in monitoring the temperature inside the box. A distance of more than 50 mm is reserved between the thermal aging system and the test piece to ensure that there is no collision between the vibration aging and the thermal aging processes.

[0007] The described control system includes a circuit part, a control part, a vibration module, a heating module, a motion module and a safety module, and its principle composition is as Figure 6 shown; the entire control system is integrated in the electric control cabinet 1; the described circuit part includes a 220VAC-12VDC power supply and an air switch; a mixed power supply of 380V AC and 220V AC is adopted; 380VAC powers the high-power heating wire, and 220V powers the low-power vibration module, motion module and control system.

[0008] The described control part includes a touch screen 2 and a PLC controller, which can set the experimental parameters, including vibration mode, vibration frequency, vibration time, thermal aging temperature, heating rate, thermal aging time, lifting and translation speeds; at the same time, the touch screen 2 can also display the vibration frequency, current temperature and current parameters. The described motion module includes servo controllers and limiters for lifting and translation; the described safety module mainly includes signal indicators, smoke sensors, speakers, travel switches and emergency stop buttons 3. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the installation position of the large-scale thermal vibration composite aging shape and property control device

[0010] Figure 2 It is a schematic structural diagram of the working position of the large-scale thermal vibration composite aging shape and property control device

[0011] Figure 3 It is a schematic structural diagram of the cylindrical box assembly

[0012] Figure 4 It is a schematic structural diagram of the test piece and the clamping method

[0013] Figure 5 It is a schematic diagram of the installation relationship between the test piece and the static and dynamic platforms

[0014] Figure 6 It is a schematic diagram of the control circuit system of the large-scale thermal vibration composite aging shape and property control device

[0015] The above Figures 1 to 5 The symbol descriptions are as follows:

[0016] 1 - Electric control cabinet, 2 - Touch screen, 3 - Switch, 4 - Column, 5 - Connector, 6 - Lifting servo motor, 7 - Fan, 8 - Cylindrical box assembly, 9 - Lifting lead screw, 10 - Fixture assembly, 11 - Specimen, 12 - Translational servo motor, 13 - Slide rail, 14 - Frame, 15 - Static platform, 16 - Vibration platform, 17 - Vibrator, 18 - Translational lead screw, 19 - Spring, 20 - Slide block, 21 - Translational lead screw nut, 22 - Cushion block, 81 - Visual window, 82 - Fan, 83 - Thermocouple, 84 - Lifting sleeve, 85 - Heating tube, 101 - Fixture pull rod, 102 - Upper clamping nut, 103 - Lower clamping nut, 104 - Trident-shaped fixture, 105 - Adjustable diameter bolt hole, 106 - Adjustable position bolt, 111 - Load-bearing cylinder, 112 - Tank bottom, 113 - Transition ring, 114 - Shell section body, 115 - Tail nozzle. Specific implementation mode

[0017] The present invention proposes a shape and property regulation device for large-scale aerospace annular thin-walled structures based on thermal-vibration composite aging, which solves the key problems such as concentrated residual stress distribution, large out-of-tolerance of the outer contour, and low service life of annular thin-walled products of large-scale aerospace carriers. The device mainly includes: a vibration aging system, a thermal aging system, a two-way motion system, and an automatic control system; the above device can conduct research on stress equalization, reduction, and precision control of vibration aging, thermal aging, and vibration-thermal composite aging for annular thin-walled products of large-scale aerospace carriers.

[0018] As Figures 1 - 5 shown, the two-way motion system includes a frame 14, a lifting servo motor 6, a column 4, a connector 5, a lifting lead screw 9, a lifting sleeve 84, a translational servo motor 12, a translational lead screw 18, a slide rail 13, and a slide block 20. The positional relationship between the above components is as Figure 1 shown; the lifting motion system is to lift the cylindrical box assembly ( Figure 3 ) to a set height. Two connectors 5 are symmetrically installed on the box body. The connector 5 is fixedly connected to the lifting sleeve 84. The lifting lead screw 9 is rotated by the lifting servo motor 6 to lift the entire cylindrical box assembly ( Figure 3 ); the translational motion system is to move the vibration aging system ( Figure 5 ) by a specific lateral distance. Both ends of the translational lead screw 18 are installed on the bearings at both ends of the frame 14, and the distal end is connected to the translational servo motor 12; two slide rails 13 are installed on the frame 14 in the same parallel width in the same way. Four slide blocks 20 are installed at the bottom of the static platform 15. Two slide blocks on the same side slide on one track; a translational lead screw nut 21 is installed in the middle at the bottom of the static platform and cooperates with the lead screw 18 for lateral translational motion. The lifting motion system and the lateral translation system are independent of each other and do not interfere with each other. Their operation and stop are controlled by the automatic control system.

[0019] The vibration aging system includes an exciter 17, a static platform 15, a vibration platform 16, springs 19, pads 22, a test piece 11, and a fixture assembly 10. The relationships between the components are as shown in Figure 1 and Figure 5 shown; the fixture assembly 10 includes a fixture pull rod 101, an upper clamping nut 102, a lower clamping nut 103, a three-pronged fixture 104, an adjustable diameter bolt hole 105, and an adjustable position bolt 106. The installation relationships are as shown in Figure 4 shown; 6 springs 19 are axially arrayed and installed on the static platform 15. The tops of the springs 19 are bolted to the vibration platform 16. Corresponding pads 22 can be installed on the vibration platform 16 according to the actual height and diameter of the test piece 11. The exciter 17 is clamped on one side of the vibration platform 16; the test piece is a spacecraft product with a ring-shaped thin-walled structure feature, such as the characteristic product shown in Figure 1 shown, which includes a transition section 11, a load-bearing cylinder 111, a tank bottom 112, a transition ring 113, a shell section 114, and a tail nozzle 115; the test piece 11 is placed on a circular moving platform and clamped using the fixture assembly ( Figure 4 ). The pull rod 101 is fixedly installed at the center of the bottom vibration platform 16. The upper clamping nut 102 and the lower clamping nut 103 can clamp and install the three-pronged fixture 104 according to the actual height of the test piece. The adjustable position bolt 106 is inserted into the adjustable diameter bolt hole 105 according to the radial dimension of the test piece to achieve the positioning and installation of the test piece.

[0020] The thermal aging system includes a cylindrical box assembly 8, a viewing window 81, a fan 82, a thermocouple 83, and a heating tube 85. The installation relationships are as shown in Figure 3 shown; the cylindrical box assembly is fixedly installed with the connector of the lifting motion system. A blower 7 is installed on the outer side of the top of the box. The shaft of the blower 7 is connected to the fan 82; the heating tube 85 is installed on the inner wall of the cylinder. 5 thermocouples 83 are distributed and installed around the box. One of them 83 is installed on the top to control the temperature, and the other four 84 are installed around the bottom to measure the temperature near the aging sample and play a role in temperature monitoring. A distance of more than 50 mm is reserved between the thermal aging system and the test piece to ensure that vibration aging and thermal aging do not collide.

[0021] As Figure 6 shown, the control system includes a circuit part, a control part, a vibration module, a heating module, a motion module, and a safety module; the control system is all integrated in the electric control cabinet 1; the circuit part includes a 220VAC - 12VDC power supply and an air switch; a mixed power supply of 380V AC and 220V AC is adopted; 380VAC powers the high-power heating wire, and 220V powers the low-power vibration module, motion module, and control system.

[0022] The control part includes a touch screen 2 and a PLC controller, which can set experimental parameters. The experimental parameters include vibration mode, vibration frequency, vibration time, thermal aging temperature, heating rate, thermal aging time, lifting and translation speeds. At the same time, the touch screen 2 can also display the vibration frequency, current temperature, and current parameters. The motion module includes servo controllers and limiters for lifting and translation. The safety module mainly includes signal indicators, smoke sensors, speakers, travel switches, and an emergency stop button 3.

[0023] Advantages of the present invention

[0024] (1) The described device can perform shape and property regulation on spacecraft products with the characteristics of annular thin-walled structures. Taking a space launcher as an example, it includes products such as transition sections, load-bearing cylinders, tank bottoms, transition rings, shell sections, and nozzle sections.

[0025] (2) The product size for which the described device can perform shape and property regulation is: maximum diameter φ1.5m, maximum height 1.8m.

[0026] (3) The described two-way motion system operates with high-precision servo motors, can achieve heavy-load operation, stop and lock at any position, and has high stability and reliability.

[0027] (4) The fixture assembly can position and clamp products with different heights and diameters, and has a strong clamping effect during large excitation forces and high-frequency vibration aging.

[0028] (5) The described device can conduct vibration-thermal composite stress experiments and production research at different temperatures, thereby further studying the shape and property regulation effects and mechanisms of products.

[0029] (6) The described control system can independently control the vibration module, heating module, and motion module respectively. By inputting parameters, the experiment can be automatically completed according to requirements.

[0030] (7) The described automatic control system can also detect states such as temperature, vibration frequency, translational motion, lifting motion, and smoke, comprehensively judge the operating state of the equipment, and can automatically alarm and cut off power in case of danger, making it safer and more reliable.

Claims

1. A device for controlling the shape of large-scale aerospace cylindrical thin-walled structural products based on thermal vibration composite aging, characterized in that: The device consists of a vibration aging system, a thermal aging system, a bidirectional motion system and an automatic control system; the exciting force of the vibration aging system is 500-10000N, and the exciting frequency is 10-200Hz; the temperature setting range of the thermal aging system is 23-300℃, and the heating rate adjustment range is 1-10℃ / min; the lifting height of the bidirectional motion system is 2.5m, and the lateral translation length is 2.0m; the maximum diameter of the cylindrical heating box is φ1.5m, and the height is 1.8m; the automatic control system can manage and control the above parameters.

2. The bidirectional motion system described in claim 1 includes a frame, a lifting servo motor, a column, a connector, a lifting screw and a lifting sleeve, a translation servo motor, a translation screw, a slide rail and a slider; the lifting motion system is to lift the cylindrical box assembly to a specific height, and two connectors are symmetrically installed on the box, and the connector is fixedly connected to the lifting sleeve, and the lifting screw is driven by the rotation of the lifting servo motor to lift the entire cylindrical box assembly; the translation motion system is to move the vibration aging system a specific lateral distance, and both ends of the translation screw are installed on bearings at both ends of the frame, and the far end is connected to the translation servo motor; the two slide rails are similarly installed on the frame with the same parallel width, and four sliders are installed at the bottom of the static platform, and the two sliders on the same side slide on one track; the translation screw sleeve is installed in the middle of the bottom of the static platform, and cooperates with the screw to perform lateral translation motion.

3. The vibration aging system described in claim 1 includes an exciter, a static platform, a vibration platform, a spring, a pad, a test piece and a fixture assembly; the fixture assembly includes a fixture pull rod, an upper clamping nut, a lower clamping nut, a trident clamp, an adjustable diameter bolt hole, and an adjustable position bolt; 6 springs are installed in an axial array on the static platform, the top of the spring is connected to the vibration platform with bolts, the corresponding pad can be installed on the vibration platform according to the actual height and diameter of the test piece, and the exciter is clamped on one side of the vibration platform; the test piece is placed on the circular moving platform and clamped with the fixture assembly, the pull rod is fixedly installed with the center of the bottom moving platform, the upper and lower clamping nuts can clamp the trident clamp according to the actual test piece height; the adjustable position bolt is inserted into the adjustable diameter bolt hole according to the radial size of the test piece to achieve the positioning and installation of the test piece.

4. The thermal aging system described in claim 1 includes a cylindrical box assembly, a visual window, a fan, a thermocouple, and a heating tube; the cylindrical box assembly is fixedly installed with the connector of the lifting motion system, a fan is installed on the outer side of the top of the box, and the shaft of the fan is connected to the fan; a heating tube is installed on the inner wall of the cylinder, and 5 thermocouples are distributed and installed around the box, one of which is installed on the top to control the temperature, and the other four are installed around the bottom to measure the temperature near the aging sample, so as to monitor the temperature inside the box.

5. The control system described in claim 1 includes a circuit part, a control part, a vibration module, a heating module, a motion module and a safety module; the control system is fully integrated in an electric control cabinet; the circuit part includes a 220VAC-12VDC power supply and an air switch; a mixed power supply of 380V AC and 220V AC is adopted; 380VAC is used to power the high-power heating wire, and 220V is used to power the low-power vibration module, motion module and control system; the control part includes a touch screen and a PLC controller, which can set the experimental parameters, including vibration mode, vibration frequency, vibration time, thermal aging temperature, heating rate, thermal aging time, lifting and translation speed; at the same time, the touch screen can also display the vibration frequency, current temperature and current parameters. The motion module includes a servo controller and a limiter for lifting and translation; the safety module mainly includes a signal indicator light, a smoke sensor, a speaker, a travel switch and an emergency stop button.

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