CN109352989B - A method for 3D printing lightweight pendulums - Google Patents

Abstract

A method for 3D printing a lightweight pendulum, and the invention relates to the field of 3D printing. The invention aims to solve the technical problem of high error in the measurement of the existing alloy material single pendulum. This method: 1. Draw a simple pendulum model in STL format; 2. Import the model into IEMAI 3D slicing software, set relevant parameters, and export a data file that can be recognized by a 3D printer in the format of Gcode; 3. Import the obtained Gcode file into In the high-temperature 3D printer, the ABS wire is used for printing, and the rough pendulum is obtained; four, after trimming, blowing, and cleaning, the light pendulum is obtained. The mass of the light-weight single pendulum is only 28% to 39% of that of the aluminum alloy single pendulum of the same size, and the sensitivity is high, which can be used for the test of micro-thrust.

Description

A method for 3D printing lightweight pendulums

technical field

The present invention relates to the field of 3D printing.

Background technique

MEMS micro-propellers have the characteristics of light weight, small size and strong controllability, which solves the important problem of limiting the advancement of micro-nano satellites, and provides micro-nano-level micro-thrust for micro-nano satellites for orbit transfer, attitude control, position control, etc. Keep. Micro-propellers are the main power components of micro-satellites, and their performance is directly related to the wide application of micro-satellites. In order to adapt to the micro-newton-level thrust required for the in-orbit operation of the microsatellite, the thrust of the micro-propeller is also in the micro-newton level. During the development of the micro-propeller, its thrust should be tested. In the existing single pendulum test devices commonly used for testing micro-newton-level thrust, an important component is the single pendulum. After the force is applied, it oscillates to calculate the thrust generated by the MEMS micro-propeller, but the existing single pendulum is generally made of aluminum alloy and titanium alloy materials. Due to the heavy mass of the pendulum, the measurement of the thrust of the order of micronewton produces a great error. Therefore, it is very important to design a simple pendulum with high precision and high sensitivity.

SUMMARY OF THE INVENTION

The present invention aims to solve the technical problem that the error caused by the measurement of the existing alloy material single pendulum is too high. Instead, a method of 3D printing a lightweight pendulum is provided.

A method for 3D printing a lightweight pendulum of the present invention includes the following steps:

1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing and modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL;

2. Import the above obtained model into IEMAI 3D slicing software, and set relevant parameters: layer thickness 0.05-0.2mm, filling density 80-95%, printing speed 40-100mm/s, print head temperature 220-260 ℃, hot bed temperature 80～100℃ and inner cavity temperature 70～90℃, after completing the parameter setting, export the data file that can be recognized by the 3D printer in the format of Gcode;

3. Import the obtained Gcode file into the high-temperature 3D printer; then add the ABS wire to the high-temperature 3D printer for printing to obtain a single pendulum rough product;

4. After trimming and cleaning the crude pendulum obtained in step 3, a lightweight pendulum is obtained.

The invention adopts the single pendulum printed by the 3D printer, has good forming strength and dimensional stability, and is highly consistent with the designed optimal single pendulum structure size, and the obtained structure has excellent mechanical properties, which can fully meet the requirements of the micro-thrust test system.

The mass of the 3D-shaped single pendulum structure of the present invention is only 1-1.4 grams, which is 28%-39% of the aluminum alloy single pendulum of the same size, and has the advantages of light weight, small space resistance, simple preparation, high reproducibility and high price. The advantage of low cost can greatly improve the micro-thrust test range of the test system, and also improve the design accuracy and processing accuracy of the impact pendulum test system. At the same time, the lightweight polymer pendulum structure has higher sensitivity than the traditional metal texture, which can significantly improve the recognition and responsiveness of the system to micro-thrust.

Description of drawings

Fig. 1 is the front view of the simple pendulum prepared in embodiment 1;

2 is a side view of the single pendulum prepared in Example 1

Fig. 3 is the structural representation of single pendulum testing device in embodiment 1;

FIG. 4 is a schematic structural diagram of the swing device of the single pendulum test device in Example 1. FIG.

Detailed ways

Embodiment 1: A method for 3D printing a lightweight pendulum in this embodiment includes the following steps:

1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing and modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL;

2. Import the above obtained model into IEMAI 3D slicing software, and set relevant parameters: layer thickness 0.05-0.2mm, filling density 80-95%, printing speed 40-100mm/s, print head temperature 220-260 ℃, hot bed temperature 80～100℃ and inner cavity temperature 70～90℃, after completing the parameter setting, export the data file that can be recognized by the 3D printer in the format of Gcode;

3. Import the obtained Gcode file into the high-temperature 3D printer; then add the ABS wire to the high-temperature 3D printer for printing to obtain a single pendulum rough product;

4. Use 2000-mesh fine sandpaper to polish the edges and corners of the single pendulum crude product obtained above and blow it with nitrogen, and then put it into an ultrasonic cleaner for ultrasonic removal of residual dust on the surface to obtain the finished single pendulum product.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that the wire diameter of the ABS wire is 1.7-2.0 mm. Others are the same as the first embodiment.

Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the layer thickness set in step 2 is 0.1-0.15 mm. Others are the same as in the first or second embodiment.

Embodiment 4: The difference between this embodiment and one of Embodiments 1 to 3 is that the filling density set in Step 2 is 85% to 90%. Others are the same as one of Embodiments 1 to 3.

Embodiment 5: The difference between this embodiment and one of Embodiments 1 to 4 is that the printing speed set in step 2 is 50-70 mm/s. Others are the same as one of Embodiments 1 to 4.

Embodiment 6: The difference between this embodiment and one of Embodiments 1 to 5 is that the temperature of the print head set in step 2 is 240-250°C. Others are the same as one of Embodiments 1 to 5.

Embodiment 7: The difference between this embodiment and one of Embodiments 1 to 6 is that the temperature of the hot bed set in step 2 is 85-90°C. Others are the same as one of Embodiments 1 to 6.

Embodiment 8: The difference between this embodiment and one of Embodiments 1 to 7 is that the temperature of the inner cavity set in step 2 is 80-85°C. Others are the same as one of Embodiments 1 to 7.

Embodiment 9: The difference between this embodiment and one of Embodiments 1 to 8 is that in step 3, the surface of the ABS wire is coated with paraffin wax or ultra-fine polytetrafluoroethylene (PTFE). Others are the same as one of Embodiments 1 to 8.

In this embodiment, the surface of the ABS wire coated with paraffin wax, during the printing process, the paraffin wax volatilizes to form micropores in the product, which can further reduce the weight of the product. The surface is coated with ultra-fine polytetrafluoroethylene which is incompatible with the surrounding matrix to form micropores.

Embodiment 10: The difference between this embodiment and one of Embodiments 1 to 9 is that the trimming described in step 4 is to use 1500-2000 mesh fine sandpaper to polish the edges and corners, and purge with nitrogen. Others are the same as one of Embodiments 1 to 9.

Verify the beneficial effects of the present invention with the following tests:

Embodiment 1: A method of 3D printing a lightweight pendulum in this embodiment is carried out according to the following steps:

1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing and modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL; the simple pendulum is composed of a pendulum rod and a pendulum piece, and the length of the pendulum rod is 161mm, 4mm wide and 2mm thick; the pendulum is 20mm long, 20mm wide and 2mm thick; its front view is shown in Figure 1, and its side view is shown in Figure 2;

2. Import the model obtained above into IEMAI 3D slicing software, and set the parameters as follows: layer thickness 0.1mm, filling density 85%, printing speed 60mm/s, print head temperature 240℃, hot bed temperature 90℃ and inner cavity temperature 80℃ , after completing the parameter setting, export the data file that the 3D printer in the format of Gcode can recognize;

3. Import the obtained Gcode file into the Dongguan Yimai MAGIC-HT-L high-temperature 3D printer; then add the ABS wire with a wire diameter of 1.75mm to the high-temperature 3D printer, and print to obtain a single pendulum rough product;

4. Use 2000-mesh fine sandpaper to polish the edges and corners of the single pendulum crude product obtained above and blow it with nitrogen, and then put it into an ultrasonic cleaner for ultrasonic cleaning to remove residual dust on the surface to obtain a light-weight single pendulum finished product.

The mass of the lightweight pendulum obtained in this example is 1.35 grams, and the mass is only 39% of the aluminum alloy pendulum of the same size. The single pendulum obtained in the present embodiment is used on the single pendulum testing device. The structure diagram of the single pendulum testing device is shown in FIG. 3 . The column 2 is set on the platform 1, the support frame 3 is set on the column 2, and the support frame 3 is provided with a knife bearing; The beam 4-3, the balance nut 4-4, and the middle knife 4-5 are composed; the two ends of the flat beam 4-3 are provided with threads and matched with the balance nut; the middle knife 4-5 is arranged in the middle of the flat beam 4-3 and the knife edge faces The two ends of the swing frame 4-2 are fixed on the flat beam 4-3, and the single pendulum 4-1 is fixed in the middle of the swing frame 4-2. The middle knife 4-5 of the swing device 4 is matched with the knife bearing on the support frame 3 . As an important part of the single pendulum test device, the swing device 4 is installed on the single pendulum test device. Due to the light weight of the single pendulum, the error in the micronewton thrust test process can be reduced, and the test sensitivity and accuracy can be improved.

Embodiment 2: A method of 3D printing a lightweight pendulum in this embodiment is carried out according to the following steps:

1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing and modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL; the simple pendulum is composed of a pendulum rod and a pendulum piece, and the length of the pendulum rod is 161mm, 4mm wide and 2mm thick; the length of the swing piece is 20mm, 20mm wide and 2mm thick; as shown in Figure 1;

2. Import the above obtained model into IEMAI 3D slicing software, and set the parameters as follows: layer thickness 0.12mm, filling density 85%, printing speed 60mm/s, print head temperature 250℃, hot bed temperature 88℃ and inner cavity temperature 80℃ , after completing the parameter setting, export the data file that the 3D printer in the format of Gcode can recognize;

3. Import the obtained Gcode file into the Dongguan Yimai MAGIC-HT-L high-temperature 3D printer; then coat the surface of the ABS wire with a wire diameter of 1.75mm with paraffin, add it to the high-temperature 3D printer, and print to obtain single pendulum coarse product;

4. Use 2000-mesh fine sandpaper to polish the edges and corners of the single pendulum crude product obtained above and blow it with nitrogen, and then put it into an ultrasonic cleaner for ultrasonic removal of residual dust on the surface to obtain a light-weight single pendulum finished product.

The mass of the pendulum obtained in this example is 1.02 grams, which is 24% lighter than that of the pendulum prepared in Example 1, and its mass is only 29.4% of the aluminum alloy pendulum of the same size. meet the usage requirements. The light weight pendulum prepared in this example was cut and observed, and it was found that regular micropores were generated inside the structure. The single pendulum test device with the same structure as Example 1 is assembled with the single pendulum whose mass is further reduced, so that the single pendulum test device can further reduce the error generated in the process of the thrust test at the micro-Newton level, and improve the test sensitivity and performance again. precision.

Embodiment 3: A method of 3D printing a lightweight pendulum in this embodiment is carried out according to the following steps:

1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing and modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL; the simple pendulum is composed of a pendulum rod and a pendulum piece, and the length of the pendulum rod is 161mm, 4mm wide and 2mm thick; the length of the swing piece is 20mm, 20mm wide and 2mm thick; as shown in Figure 1;

2. Import the obtained model into the IEMAI 3D slicing software, and set the parameters as follows: layer thickness 0.12mm, filling density 90%, printing speed 60mm/s, print head temperature 260℃, hot bed temperature 100℃ and inner cavity temperature 90℃ , after completing the parameter setting, export the data file that the 3D printer in the format of Gcode can recognize;

3. Import the obtained Gcode file into the Dongguan Yimai MAGIC-HT-L high temperature 3D printer; then coat the surface of the ABS wire with a wire diameter of 1.75mm with ultra-fine PTFE with a particle size of 1 to 2 microns. Add it to the high-temperature 3D printer, print it, and get a single pendulum rough product;

4. Use 2000-mesh fine sandpaper to polish the edges and corners of the single pendulum crude product obtained above and blow it with nitrogen, and then put it into an ultrasonic cleaner for ultrasonic removal of residual dust on the surface to obtain a light-weight single pendulum finished product.

The mass of the pendulum obtained in this example is 1.00 g, which is 26% lower than that of the pendulum prepared in Example 1. Its mass is only 28.9% of the aluminum alloy pendulum of the same size, and its strength can meet the Requirements. The light weight pendulum prepared in this example was cut and observed, and it was found that irregular micropores were generated inside the structure.

Claims (9)

1. A method of 3D printing a lightweight pendulum, characterized in that the method comprises the following steps: 1. Using Solidworks drawing software, according to the structure diagram of the simple pendulum, carry out isometric drawing modeling of the simple pendulum, and obtain the simple pendulum model in the format of STL; 2. Import the above obtained model into IEMAI 3D slicing software, and set relevant parameters: layer thickness 0.05～0.2mm, filling density 80～95%, printing speed 40～100mm/s, print head temperature 220～260℃, hot bed temperature 80～100℃ and inner cavity temperature 70～90℃, after completing the parameter setting, export the data file that can be recognized by the 3D printer in the format of Gcode; 3. Import the obtained Gcode file into the high-temperature 3D printer; then add the ABS wire coated with paraffin wax or ultra-fine PTFE to the high-temperature 3D printer, and print to obtain a single pendulum crude product; 4. Use 2000-mesh fine sandpaper to polish the edges and corners of the single pendulum crude product obtained above and blow it with nitrogen, then put it into an ultrasonic cleaner for ultrasonic removal of residual dust on the surface, and obtain a light-weight single pendulum product that tests micronewton-level thrust. 2 . The method for 3D printing a lightweight pendulum according to claim 1 , wherein the wire diameter of the ABS wire is 1.7-2.0 mm. 3 . 3 . The method for 3D printing a lightweight pendulum according to claim 1 or 2 , wherein the layer thickness set in step 2 is 0.1-0.15 mm. 4 . 4 . The method for 3D printing a lightweight pendulum according to claim 1 or 2 , wherein the filling density set in step 2 is 85% to 90%. 5 . 5 . The method for 3D printing a lightweight pendulum according to claim 1 or 2 , wherein the printing speed set in step 2 is 50-70 mm/s. 6 . 6 . The method for 3D printing a lightweight pendulum according to claim 1 or 2 , wherein the temperature of the print head set in step 2 is 240-250° C. 7 . 7 . The method for 3D printing a lightweight pendulum according to claim 1 or 2 , wherein the temperature of the hot bed set in step 2 is 85-90° C. 8 . 8 . The method for 3D printing a light-weight single pendulum according to claim 1 or 2 , wherein the temperature of the inner cavity set in step 2 is 80-85° C. 9 . 9. The method for 3D printing a light-weight pendulum according to claim 1 or 2, wherein the trimming in step 4 is to use 1500-2000 mesh fine sandpaper to polish the edges and corners, and purge with nitrogen.

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