Damping type energetic material 3D printing forming platform

Abstract

The application discloses a 3D printing forming platform for energy-containing materials with vibration reduction, which comprises a workbench, a printing platform, an electric control rotating table and an X-axis driving system. The X-axis driving system is driven by a motor-screw rod mode, and the screw rod of the X-axis driving system cooperates with a sliding block to drive the printing platform to move along the X-axis direction. The two ends of the ball screw of the X-axis driving system are provided with vibration absorbers through bearings. The vibration absorbers comprise inner rings and outer rings arranged inside and outside. A plurality of dampers are uniformly distributed between the inner rings and the outer rings in the circumferential direction. Grooves are formed in the outer ring sections between adjacent dampers, and spring-metal ball type damping devices are arranged in the grooves. The four dampers and the damping devices are symmetrically arranged in the vibration absorber, vibration energy is uniformly absorbed, energy generated by vibration transmitted in various directions is absorbed, the precision of 3D printing is improved, and the quality of 3D printed parts is ensured.

Description

Technical Field

[0001] This invention belongs to the field of energetic material 3D printing, specifically relating to a vibration-damping energetic material 3D printing molding platform. Background Technology

[0002] Energetic materials are substances that can react sustainably without the participation of external matter, releasing enormous amounts of energy in a short period of time. The most basic and traditional energetic materials are propellants, propellants, and explosives. Propellants and propellants generally require a relatively slow process of several seconds to completely burn and explode. Explosives, on the other hand, explode in only a few microseconds. Despite these different energy release processes, these three types of energetic materials share many chemical similarities. Many energetic materials are similar in composition, generally including the four elements C, H, O, and N.

[0003] 3D printing technology is a rapidly developing manufacturing technology in recent years. Its main characteristic is additive manufacturing, which involves the accumulation of materials, enabling the rapid production of objects with arbitrarily complex geometries. For products with complex structures, it can accelerate manufacturing and improve product quality. It not only significantly improves the efficiency of traditional mold-making methods but also injects new elements into customized manufacturing, driving the development of the manufacturing industry.

[0004] There are two methods for leveling 3D printers: electronic leveling and manual leveling. While electronic leveling saves manpower, it adds more components, increasing costs. Manual leveling, on the other hand, is more reliable. After leveling, the 3D printing platform can deform due to minute vibrations generated during motor operation, causing the leveling result to fail and affecting the overall printing quality. Furthermore, improper leveling can lead to model deformation, increased cracks, and slower printing speed, thus impacting overall printing efficiency and quality.

[0005] Currently, most 3D printing equipment on the market uses screws and springs to connect the worktable and printing platform. During the printing process, the motor drives the lead screw, inevitably generating vibrations that affect the printing results. This can cause problems such as interlayer deformation, uneven stress, uneven flow and solidification, and dimensional deformation within the printed part, severely impacting its performance and accuracy. To reduce unavoidable vibrations, the main approach is usually to modify the mechanism's structure, with vibration damping devices being rarely used. However, modifying the mechanism's structure requires significant time and financial resources, and the vibration reduction effect is not substantial. Common vibration damping devices for rotating shafts typically use spring-based devices, which are ineffective. Considering the millimeter-level accuracy errors in printing energetic materials, a more effective and comprehensive vibration damping device needs to be designed. Summary of the Invention

[0006] The purpose of this invention is to provide a vibration-damping 3D printing platform for energetic materials. A novel vibration absorber structure has been designed, which improves the original leveling structure and optimizes the printing effect.

[0007] The technical solution to achieve the purpose of this invention is: a vibration-damping energetic material 3D printing molding platform, including a worktable, a printing platform set on the worktable, an electrically controlled rotary table of the worktable, an X-axis drive system and a Y-axis drive system.

[0008] The X-axis drive system uses a motor-screw method. The screw of the X-axis drive system works with the slider to drive the printing platform to move along the X-axis direction.

[0009] The ball screw of the X-axis drive system has vibration dampers at both ends via bearings. Each vibration damper includes an inner ring and an outer ring arranged inside and outside. Multiple dampers are evenly distributed circumferentially between the inner and outer rings. A groove is opened in the outer ring section between adjacent dampers, and a spring-metal ball vibration damping device is installed in the groove.

[0010] Furthermore, the X-axis drive system includes a ball screw, bearing plate, coupling, support base, servo motor, square rail, profile, motor plate, slider and outer ring support;

[0011] The bearing plate is connected to the profile, the profile is connected to the motor plate, two square rails are fixed to the profile with screws, the support base is fixed to the profile, the ball screw is mounted on the motor plate and the support base through bearings, two vibration absorbers are installed at both ends of the ball screw, the slider is connected to the ball screw, and the slider moves on the square rail.

[0012] Furthermore, the X-axis drive system also includes an outer ring support, through which the outer ring of the vibration absorber is connected to the profile.

[0013] Furthermore, the electrically controlled rotary table is connected to the slider via connecting plate II.

[0014] Furthermore, the workbench is cross-shaped, with the central groove connected to the electrically controlled rotary table by screws. The ends of the four arms of the workbench are connected to the workbench and the printing platform by leveling components. The printing platform is circumferentially fixed with four clamps by screws, and a universal level is fixed in the center of the printing platform by screws.

[0015] Furthermore, the leveling assembly includes bolts, leveling nuts, and springs; the springs are mounted on the bolt surfaces, and the bolts are connected by leveling nuts.

[0016] Furthermore, there are four dampers, with an included angle of 90° between adjacent dampers. Each damper includes four lower metal cylinders fixed to the inner ring surface and four upper metal cylinders connected to the four lower metal cylinders by threads. A radial spring with a natural length greater than the length of the cylinder is fitted on the surface of each cylinder. The cylinder is filled with upper and lower metal rubber. The upper metal rubber wraps around a guide rod, the lower part of which is a T-shaped head. The surface of the T-shaped head rests against the lower metal rubber. The guide rod passes through the upper metal rubber and the top of the upper metal cylinder and is then threadedly connected to connecting plate I. Connecting plate I is connected to the outer ring by screws.

[0017] Furthermore, the spring-metal ball type vibration damping device includes a vibration damping device tube installed in a groove, two circumferential springs and spring mounting plates installed at both ends of the circumferential springs are provided in the vibration damping device tube, and a metal ball is fixed between the two circumferential springs through the cylindrical groove of the spring mounting plate. The circumferential springs are in a compressed state when they are not working.

[0018] Furthermore, the inner ring is composed of two semi-circular rings, which are connected by an extension at the end of the semi-circular rings.

[0019] The outer ring consists of two semi-circular rings. Two spring-metal ball vibration damping devices are installed in the groove formed by the assembly of the two semi-circular rings and are connected by a combined outer ring mounting plate. The outer ring is equipped with two other grooves on the outer ring for installing spring-metal ball vibration damping devices. The outer ring mounting plates are installed on the outer ring grooves by bolts.

[0020] Furthermore, the outer ring of the vibration absorber is an aluminum alloy ring with multiple evenly distributed circular holes. The circular holes are inclined holes that resemble a goat's hoof box, with an inclination angle of 30°.

[0021] Compared with the prior art, the significant advantages of this invention are:

[0022] (1) The vibration absorber of the present invention is independently designed. By using four vibration damping devices built into the outer ring and four dampers and springs installed between the inner and outer rings, it can effectively reduce the radial and circumferential vibrations of the ball screw at the same time. The inclined hole of the imitation goat hoof box on the outer ring can reduce the vibration of the vibration absorber, thereby improving the stability of the 3D printing molding platform and the 3D printing accuracy.

[0023] (2) It adopts a built-in universal level, which has a leveling function and can improve the accuracy of the finished product of the 3D printer;

[0024] (3) When used in conjunction with fused deposition modeling (FDM) 3D printing equipment, the use of an electrically controlled rotary table is beneficial for processing rotating bodies and parts with regular geometric shapes;

[0025] (4) The structure is relatively simple. It only requires improvement of the existing 3D printing platform. The number of parts is small and manufacturing and improvement are convenient. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an energetic materials 3D printer;

[0027] Figure 2 This is a schematic diagram of the structure of the energetic material 3D printing platform of the present invention;

[0028] Figure 3 This is a schematic diagram of the worktable structure in the energetic material 3D printing platform of the present invention;

[0029] Figure 4 This is a schematic diagram of the vibration absorber structure in the energetic material 3D printing platform of the present invention;

[0030] Figure 5 This is a top view of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0031] Figure 6 This is a cross-sectional view of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0032] Figure 7 This is a schematic diagram of the damper structure of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0033] Figure 8 This is a cross-sectional view of the damper of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0034] Figure 9 This is a schematic diagram of the spring mounting plate of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0035] Figure 10 This is a cross-sectional view of the spring mounting plate of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0036] Figure 11 This is a schematic diagram of the vibration damping device tube of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0037] Figure 12 This is a schematic diagram of the outer ring structure of the vibration absorber in the energetic material 3D printing platform of the present invention;

[0038] Figure 13 This is a schematic diagram of the outer ring support of the vibration absorber in the energetic material 3D printing platform of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Circumferential spring, 2-Spring mounting plate, 3-Metal ball, 4-Combined outer ring mounting plate, 5-Vibration damping device tube, 6-Connecting plate I, 7-Upper metal rubber, 8-Radial spring, 9-Upper metal cylinder, 10-Guide rod, 11-Lower metal rubber, 12-Outer ring, 13-Lower metal cylinder, 14-Inner ring, 15-Outer ring mounting plate, 16-Worktable, 17-Leveling assembly, 18-Electrically controlled rotary table, 19-Connecting plate II, 20-Ball screw, 21-Bearing plate, 22-Universal level, 23-Clamp, 24-Printing platform, 25-Coupling, 26-Support seat, 27-Servo motor, 28-Square rail, 29-Profile, 30-Motor plate, 31-Slider, 32-Outer ring support. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings.

[0042] like Figure 1-13 As shown, the structure of the vibration-damping energetic material 3D printing platform of the present invention includes most of the 3D printing platform mechanisms and the X-axis drive system. Figure 2-3 As shown, the system includes a bearing plate 21 connected to a profile 29, a profile 29 connected to a motor plate 30, two square rails 28 fixed to the profile 29 with screws, a support base 26 fixed to the profile 29, a servo motor 27 driving a ball screw 20 to rotate via a coupling 25, the ball screw 20 mounted on the motor plate 30 and the support base 26 via bearings, two vibration dampers mounted at both ends of the ball screw 20, a slider 31 connected to the ball screw 20, a slider 31 tightly connected to the square rails 28, a connecting plate II 19 connected to the slider 31, an electrically controlled rotary table 18 fixed to the connecting plate II 19 with screws, a groove in the middle of the worktable 16 connected to the electrically controlled rotary table 18 with screws, four leveling assemblies 17 connecting the worktable 16 and the printing platform 24, four clamps 23 fixed to the printing platform 24 with screws, and a universal level 22 fixed to the center of the printing platform 24 with screws. The leveling assembly 17 includes bolts with springs mounted on their surfaces and leveling nuts connecting the bolts. Two vibration dampers are fixed to the ball screw 20 by bearings. Four outer ring supports 32 are installed on both sides of the profile with screws, and the outer ring supports 32 fix the outer ring 12 so that it does not rotate with the rotation of the ball screw 20. The ball screw 20 is driven by a servo motor 27 through a coupling 25. The electrically controlled rotary table 18 drives the worktable 16 and the printing platform 24 to rotate at a low speed. The worktable 16 has a circular groove in the center to accommodate the universal level 22 as it descends to the lowest point.

[0043] like Figure 4-11As shown, the vibration absorber includes two inner rings 14 connected by bolts, four lower metal cylinders 13 fixed to the surface of the inner rings 14, and four upper metal cylinders 9 connected to the four lower metal cylinders 13 by threads. Radial springs 8 are fitted onto the cylinder surfaces, and metal rubber 7 and lower metal rubber 11 are filled in the middle. The upper metal rubber 7 wraps around the guide rod 10, which is threaded to the connecting plate I6. The connecting plate I6 is connected to the outer ring 12 by screws. A vibration damping device tube 5 is placed in the middle groove of the two outer rings 12. The vibration damping device inside the tube 5 consists of two circumferential springs 1 and four spring mounting plates 2 fixing metal balls 3. The circumferential springs 1 are always in a compressed state when not in operation. Other vibration damping devices are installed in the grooves formed by the assembly of the ends of the two outer rings 12. The installation and operation of the other vibration damping devices remain unchanged. The outer ring mounting plate 15 is installed on the groove of the outer ring 12, and the outer rings 12 are connected by bolts. The outer ring of the vibration absorber is an aluminum alloy ring with multiple evenly distributed circular holes. These holes are inclined holes resembling those of a goat's hoof, with an inclination angle of 30°. The four lower metal cylinders of the vibration absorber are symmetrically arranged, with an angle of 90° between adjacent cylinders.

[0044] The working principle of this invention is as follows: A vibration-damping energetic material 3D printing platform is leveled by observing the position of the bubble on the universal level 22 and rotating the leveling nut to adjust the tilt direction. Simultaneously, the distance between the print head and the printing platform 24 of the fused deposition modeling (FDM) 3D printing equipment is adjusted to the optimal value. The servo motor 27 and the electrically controlled rotary table 18 are activated to achieve relative spatial displacement between the print head and the printing platform 24. The vibration generated by the rotation of the ball screw 20 is transmitted to the vibration absorber. The vibration absorber, because it is mounted on the bearing and its outer ring is fixed by the outer ring support 32, does not rotate with the ball screw 20. The vibration absorber absorbs a portion of the vibration energy through the inclined hole of the goat hoof-shaped box on the outer ring 12, while the metal ball 3 of the vibration damping device absorbs the remaining vibration energy. The vibration of the metal ball 3 is absorbed by the circumferential springs 1 on both sides, thereby reducing circumferential vibration. A damper is installed between the inner ring 14 and the outer ring 12. The damper includes a connecting plate I6 and a guide rod 10 connected by threads. The guide rod 10 is placed inside the upper metal cylinder 9 and the lower metal cylinder 13. The upper metal rubber 7 and the lower metal rubber 11 are placed inside the lower metal cylinder 13. The T-shaped end of the guide rod 10 is fixed by the upper metal rubber 7 and the lower metal cylinder 13. The damper and the radial spring 8 enhance the vibration control effect of the vibration absorber and reduce radial vibration. When the connecting plate I6 is under tension, the lower metal rubber 11 is released from stress. The guide rod 10 in the upper metal cylinder 9 and the lower metal cylinder 13 moves upward and squeezes the upper metal rubber 7, causing it to be compressed. The energy input to the structure by vibration is consumed through the elastic deformation of the material. When the connecting plate I6 is compressed, the upper metal rubber 7 is released from stress. The guide rod 10 in the upper metal cylinder 9 and the lower metal cylinder 13 moves downward and squeezes the lower metal rubber 11, causing it to be compressed. The energy transmitted to the structure by vibration is consumed through the elastic deformation of the material. After the vibration energy is dissipated, the metal damper resets. The four dampers and vibration reduction devices are symmetrically arranged, absorbing vibration energy relatively evenly. The vibration reduction devices and dampers are distributed in eight directions, which is beneficial for absorbing the energy generated by vibrations transmitted from all directions.

Claims

1. A vibration-damping energetic material 3D printing platform, characterized in that, Includes a worktable (16), a printing platform (24) set on the worktable (16), an electrically controlled rotary table (18) of the worktable (16) and an X-axis drive system; The X-axis drive system is driven by a motor-screw method. The screw of the X-axis drive system works with the slider to drive the printing platform (24) to move along the X-axis direction. The ball screw (20) of the X-axis drive system has vibration absorbers at both ends through bearings. The vibration absorber includes an inner ring (14) and an outer ring (12) arranged inside and outside. Multiple dampers are evenly distributed in the circumferential direction between the inner ring (14) and the outer ring (12). A groove is opened in the outer ring (12) section between adjacent dampers, and a spring-metal ball vibration damping device is installed in the groove. The X-axis drive system includes a ball screw (20), a bearing plate (21), a coupling (25), a support base (26), a servo motor (27), a square rail (28), a profile (29), a motor plate (30), a slider (31), and an outer ring support (32). The bearing plate (21) is connected to the profile (29), the profile (29) is connected to the motor plate (30), the two square rails (28) are fixed to the profile (29) with screws, the support seat (26) is fixed to the profile (29), the ball screw (20) is mounted on the motor plate (30) and the support seat (26) through bearings, the two vibration absorbers are mounted on both ends of the ball screw (20), the slider (31) is connected to the ball screw (20), and the slider (31) moves on the square rail (28); The X-axis drive system also includes an outer ring support (32), and the outer ring (12) of the vibration absorber is connected to the profile (29) through the outer ring support (32); The electrically controlled rotary table (18) is connected to the slider (31) via connecting plate II (19); The workbench (16) is cross-shaped. The groove in the middle of the workbench (16) is connected to the electric rotary table (18) with screws. The ends of the four arms of the workbench (16) are connected to the workbench (16) and the printing platform (24) with leveling components (17). Four clamps (23) are evenly fixed to the printing platform (24) with screws. A universal level (22) is fixed to the center of the printing platform (24) with screws. The leveling assembly (17) includes a bolt, a leveling nut, and a spring; the spring is mounted on the surface of the bolt, and the bolt is connected by the leveling nut; The number of dampers is four, and the included angle between adjacent dampers is 90°. The damper includes four lower metal cylinders (13) fixed on the surface of the inner ring (14), and four upper metal cylinders (9) connected to the four lower metal cylinders (13) by threads. The cylinder surface is fitted with a radial spring (8) with a natural length greater than the cylinder length. The cylinder is filled with upper metal rubber (7) and lower metal rubber (11). The upper metal rubber (7) wraps the guide rod (10). The lower part of the guide rod (10) is a T-shaped head. The surface of the T-shaped head abuts against the lower metal rubber (11). The guide rod (10) passes through the upper metal rubber (7) and the upper metal cylinder (9) and is threaded to the connecting plate I (6). The connecting plate I (6) is connected to the outer ring (12) by screws. The spring-metal ball type vibration damping device includes a vibration damping device tube (5) set in a groove. The vibration damping device tube (5) is provided with two circumferential springs (1) and spring mounting plates (2) set at both ends of the circumferential springs (1). A metal ball (3) is fixed between the two circumferential springs (1) through the cylindrical groove of the spring mounting plate (2). The circumferential springs (1) are in a compressed state when they are not working. The inner ring (14) consists of two semicircular rings, which are connected by the connecting part of the extended end of the semicircular rings. The outer ring (12) is composed of two semi-circular rings. Two spring-metal ball vibration damping devices are set in the groove formed by the assembly of the two semi-circular rings and the outer ring (12) is connected by a combined outer ring mounting plate (4). The outer ring mounting plate (15) is provided in the grooves of the other two spring-metal ball vibration damping devices on the outer ring. The outer ring mounting plate (15) is installed on the groove of the outer ring (12) by bolts. The outer ring (12) of the vibration absorber is an aluminum alloy ring with multiple evenly distributed round holes. The round holes are inclined holes that resemble goat hoof boxes, with an inclination angle of 30°.

Images