An adaptive temperature sensing 3D printing method

Abstract

The application discloses a kind of self-adapting temperature response 3D printing methods, comprising: step S1, the three-dimensional model of the preset part A is imported into laser selective melting forming special slice software and is sliced;Step S2, slice data is imported into laser selective melting forming special software;Step S3, call printing procedure and light printing;Step S4, according to the first forming strategy, single scanning is carried out;Step S5, mark the region of the current layer temperature lower than temperature difference data;Step S6, the second forming strategy is started for the region of the current layer temperature lower than temperature difference data;Step S7, after scanning, the temperature sensor detects entire forming range again, and records detection result;Then call next slice data, repeat the execution step S4 to step S7, until the complete forming layer of part A is printed.The application has the technical effects of reducing temperature gradient, reducing internal stress, preventing deformation cracking and the like.

Description

Technical Field

[0001] This invention relates to 3D printing methods, and more particularly to an adaptive temperature-sensing 3D printing method. Background Technology

[0002] Laser selective melting (LSM) technology features rapid melting and solidification. However, in practical applications, because the substrate heating temperature typically only reaches 200°C, traditional scanning methods, due to their limited scan line length and scanning strategy, cannot proactively adapt to the product structure when forming large-area parts or products with significant cross-sectional area variations. This results in the substrate's heat supply being insufficient to compensate for heat differences generated during the scanning process after the laser beam scans the same forming cross-section, easily leading to temperature gradients. Furthermore, different structures exhibit varying heat dissipation rates, resulting in high stress in the current forming cross-section of the part. High stress can easily cause product deformation and cracking, and in severe cases, render the product unusable. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an adaptive temperature sensing 3D printing method that can reduce temperature gradient, reduce internal stress, and prevent deformation and cracking, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] An adaptive temperature-sensing 3D printing method includes the following steps: Step S1, importing a preset 3D model of part A into laser selective melting forming (SLM) slicing software for slicing; Step S2, importing the slicing data into the SLM software, setting fill lines and scanning strategies for each slice, the scanning strategies including a first forming strategy and a second forming strategy, and then forming a printing program; Step S3, transferring the printing program to the printing device, calling the printing program and emitting light for printing; Step S4, performing a single scan according to the first forming strategy, the first forming strategy including: dividing the cross-sectional shape of part A into one or more independent regions, dividing the independent regions into multiple parallel strips of preset width, each strip filled with scan lines, and the scan lines in adjacent strips being perpendicular to each other; Step S5, after the current layer scan is completed, the temperature sensor in the printing device... The temperature of the entire forming area is detected, and the temperature data of each area of ​​the forming area is transmitted to the control system of the printing equipment. The control system calculates the temperature difference of the entire forming area and marks the areas where the current layer temperature is lower than the temperature difference data according to the preset temperature difference data. Step S6: For the areas where the current layer temperature is lower than the temperature difference data, the second forming strategy is activated. The second forming strategy includes: dividing the cross-sectional shape of part A into one or more independent areas, dividing the independent areas into multiple rectangular scanning blocks of the same size, filling each rectangular scanning block with scanning lines, and the included angle between the scanning lines of two adjacent rectangular scanning blocks is a preset acute angle. Step S7: After scanning is completed, the temperature sensor detects the entire forming area again and records the detection results. Then, the next layer slice data is retrieved, and steps S4 to S7 are repeated until all forming layers of part A are printed.

[0006] Preferably, in the first shaping strategy, the strip width is different in each layer of slice data.

[0007] Preferably, during the execution of the first forming strategy: based on the size setting of each strip, when performing the scanning task, the strips with two adjacent scanning lines perpendicular to each other are first scanned. Then, the galvanometer of the laser jumps, and the laser scanning path changes accordingly, pointing to the strips that are spaced one or more apart from the two strips mentioned above. The scanning of the strips with two adjacent scanning lines perpendicular to each other is completed again. This process is repeated until the scanning task of all strips in the region is completed.

[0008] Preferably, in the second forming strategy, the angle between the scan lines in two adjacent rectangular scan blocks is 15°.

[0009] Preferably, in step S2, parameters including scanning speed and laser power are set for each scan line, and the forming layer thickness is set to D.

[0010] Preferably, in step S5, the preset temperature difference data T is 20℃~50℃.

[0011] Preferably, in step S5, the preset temperature difference data T is 30℃.

[0012] Preferably, in step S4, the two or more independent regions divided according to the cross-sectional shape of the part A are connected to each other or separated from each other.

[0013] Preferably, in step S3, after the printing program is transferred to the printing device, operations including powder spreading, leveling, air suction, and substrate heating are performed.

[0014] Preferably, in step S5, the control system calculates the temperature difference across the entire forming area: if the current layer does not have an area with a temperature lower than the temperature difference data, then step S6 is skipped and step S7 is executed.

[0015] In the adaptive temperature sensing 3D printing method disclosed in this invention, the scanning block and scanning line are used to compensate for the temperature non-uniformity of a certain area during the forming process. The temperature sensor in the forming equipment identifies the temperature difference between a certain area and the surrounding area. If the temperature difference is greater than the preset temperature difference value, the laser emits light, and the corresponding scanning block and scanning line in that area emit light again for printing. Through secondary sintering, the temperature gradient is reduced and adaptive temperature sensing is achieved, which can effectively reduce the difference in heat input and thus achieve adaptive control of the temperature gradient. Compared with the prior art, this invention can reduce internal stress and reduce product deformation and cracking, especially for large-size and thick-walled parts, which have better printing and forming effects. Attached Figure Description

[0016] Figure 1 Here is a schematic diagram illustrating the shape of part A;

[0017] Figure 2 This is the front view of part A;

[0018] Figure 3 for Figure 2 A sectional view along line AA.

[0019] Figure 4 for Figure 2 Sectional view along the BB line;

[0020] Figure 5 for Figure 2 A cross-sectional view along the CC line;

[0021] Figure 6 for Figure 5 A schematic diagram of regions A and B divided by the cross-section shown;

[0022] Figure 7 This is a schematic diagram showing the division of regions A and B into strips in the first forming strategy.

[0023] Figure 8 This is a schematic diagram after the strips are filled with scan lines;

[0024] Figure 9 A schematic diagram showing the division of regions A and B into rectangular scanning blocks in the second forming strategy;

[0025] Figure 10 A schematic diagram after filling the rectangular scan block with scan lines. Detailed Implementation

[0026] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0027] This invention discloses an adaptive temperature-sensing 3D printing method, which includes the following steps:

[0028] Step S1: Import the preset 3D model of part A into the laser selective melting forming special slicing software for slicing;

[0029] Step S2: Import the slice data into the laser selective melting and forming software, set the fill line and scanning strategy for each slice, the scanning strategy includes a first forming strategy and a second forming strategy, and then form a printing program; in step S2, set parameters including scanning speed and laser power for each scanning line, and set the forming layer thickness to D;

[0030] Step S3: The printing program is transferred to the printing device, the printing program is invoked and the light is emitted for printing; in this step S3, after the printing program is transferred to the printing device, operations including powder spreading, leveling, air suction and substrate heating are performed.

[0031] Step S4: Perform a single scan according to the first forming strategy, the first forming strategy including:

[0032] The cross-sectional shape of part A is divided into one or more independent regions, and the independent regions are further divided into multiple parallel strips of a preset width. Each strip is filled with scan lines, and the scan lines in two adjacent strips are perpendicular to each other. In a preferred embodiment, in step S4, the two or more independent regions divided according to the cross-sectional shape of part A are connected to each other or separated from each other.

[0033] Step S5: After the current layer scanning is completed, the temperature sensor in the printing device detects the temperature of the entire forming area and transmits the temperature data of each area of ​​the forming area to the control system of the printing device. The control system calculates the temperature difference of the entire forming area and marks the areas where the current layer temperature is lower than the temperature difference data according to the preset temperature difference data. In step S5, the preset temperature difference data T is 20℃~50℃, for example, the preset temperature difference data T is 30℃.

[0034] Step S6: For regions where the current layer temperature is lower than the temperature difference data, a second forming strategy is initiated. The second forming strategy includes:

[0035] The cross-sectional shape of part A is divided into one or more independent regions, and the independent regions are divided into multiple rectangular scanning blocks of the same size. Scan lines are filled into each rectangular scanning block, and the included angle between the scan lines in two adjacent rectangular scanning blocks is a preset acute angle. Preferably, the included angle between the scan lines in two adjacent rectangular scanning blocks is 15°.

[0036] Step S7: After the scanning is completed, the temperature sensor will scan the entire forming area again and record the scan results.

[0037] Then retrieve the next layer of slice data and repeat steps S4 to S7 until all forming layers of part A are printed.

[0038] In the specific execution process, in step S5, the control system calculates the temperature difference of the entire forming area: if the current layer does not have an area with a temperature lower than the temperature difference data, then step S6 is skipped and step S7 is executed.

[0039] For the above technical solutions, please refer to [link / reference]. Figure 1 Taking the hollow stepped part A as an example, according to the working principle of laser selective melting forming, the part is formed into a three-dimensional structure by layering powder, sintering, and stacking layers. The layer thickness d1 is set to 0.001~0.2mm, and the printing layer thickness D: N*d1=0.001~1mm; N: 1, 2, 3… Due to the structural characteristics of part A, one side of the stepped cross-section is used as the forming bottom surface, making the hollow triangle in the middle an upper triangle shape. Thus, the forming cross-section of part A will change significantly along different forming heights during forming, and the cross-sectional shape will differ greatly at different forming heights, such as… Figures 2 to 5 As shown. Part A has a triangular cutout in the middle. From the front view, the angle between the left side and the horizontal direction is α: 15~90°, the height between the left side and the vertex of the triangle is t1: 0.5~10000mm, the angle between the right side and the horizontal direction is β: 10~90°, the height between the right side and the vertex of the triangle is t2: 1~10000mm, and α>β, t2>t1.

[0040] Following the aforementioned arrangement, the 3D digital model of part A is imported into the specialized slicing software of the laser selective melting forming equipment for slicing. This results in a series of contour slices with a layer thickness of d1. Due to differences in height, the horizontal cross-sectional shapes of these slices vary. Figures 2 to 5 It is evident that the AA section differs significantly from the BB and CC sections. The AA section is closer to the bottom of the forming process, has a wider area, and a larger cross-sectional area. Similarly, because its overall cross-sectional shape is a stepped shape with varying dimensions, if a conventional scanning method is used, the scanning strip length at different locations will vary significantly, resulting in significant differences in temperature uniformity across the entire forming area. This creates a large temperature gradient even in the current layer. With each layer printed and stacked, countless thermal cycles accumulate, causing significant increases and decreases in internal stress within the part, thus increasing the risk of deformation and cracking. For materials with low thermal conductivity and high stress, such as titanium alloys, the risk of scrapping increases dramatically. Meanwhile, the BB and CC sections are far from the forming substrate, and their cross-sectional shapes begin to change. Initially a single, stepped shape, they disperse into two smaller cross-sections. The BB section has a directional cross-section with significantly different cross-sectional areas, and the CC section also has two different shapes with significantly different cross-sectional areas—one rectangular and the other stepped. At this point, the large cross-sectional area on the left has a large solid connection at the bottom, allowing heat to dissipate relatively quickly. While the cross-sectional area on the right is smaller, the cross-sectional change at the connection point with the bottom is greater, resulting in greater heat accumulation and slower heat dissipation. This creates temperature gradients of varying degrees on the left and right sides, leading to different levels of internal stress, with the right side experiencing more severe stress. If stress concentration exists on either side or if there is poor sintering in a certain area, microcracks are easily induced. As the forming height increases or decreases, the number of thermal cycles further increases, and crack propagation can easily lead to product cracking. Furthermore, if the forming area is large, the stress shrinkage of the part itself is significant. Even if the product does not crack, the deformation will continuously accumulate, leading to dimensional deviations.

[0041] Furthermore, as the forming height increases again, the left and right sections return to the whole, forming a shape consistent with section AA. Although the cross-sectional shape is consistent at this time, the structural shape of the bottom on the left and right sides is completely different. If the scanning method or strategy that is completely consistent with section AA is still used, according to the above analysis, the temperature after scanning the entire forming section will be significantly different, resulting in a significant temperature gradient on the same forming area, which in turn induces the generation of internal stress and exacerbates the risk of product deformation and cracking.

[0042] To address this situation, the present invention proposes the aforementioned adaptive temperature-sensing 3D printing method. For ease of explanation, a CC cross-section is used as an example, and its entire cross-section is as follows: Figure 6As shown, its cross-section is divided into two different regions, namely region A and region B. Region A is a large rectangle, while region B is a smaller stepped shape.

[0043] Subsequently, regions A and B were divided separately, and the division results are as follows: Figure 7 As shown. When dividing region A, a conventional strip method is used, with strip length L1: 5–500 mm and strip width W1: 2–50 mm. It should be noted that the width of each strip is different; as the distance from the vertex of the triangle increases, the strip length L1 continuously decreases. The first layer is defined as the layer starting from the left side of region A. When region A has reached a certain height, the current layer is the Nth layer, and the strip length of region A is Ln. Therefore:

[0044] L1n=L1O-(t1 / D–N)*D / tanα; where L1O is the length at which the A-th region just begins to form, and L1n: 5~500mm.

[0045] When dividing region B, a conventional strip method is adopted, with strip length L2 ranging from 3 to 300 mm and strip width W2 ranging from 1 to 50 mm. It is important to note that the width of each strip layer is different, and the strip length L2 decreases continuously as the distance from the vertex of the triangle increases. Defining the first layer as the layer starting from the left side of region B, when region B has reached a certain height and the current layer is the Nth layer, the strip length of region B is L2n, then:

[0046] L2n=L2O-(t2 / D–N)*D / tanβ; where L2O is the length at which the B-th region begins to form, and L2n: 3~300mm.

[0047] It should be emphasized that, because the strip width in region B is small and the cross-section of each layer in region B is different, when dividing the strips, there is a part of the strip length that is small, which is defined as L3. After the current forming layer is divided according to the strip division principle mentioned above, the remaining area is the L3 strip area, and L2 > L3 is satisfied.

[0048] Then, scan lines are filled into regions A and B, such as... Figure 8 As shown, each stripe in regions A and B is filled with mutually perpendicular scan lines. The scan line spacing of each scan block in region A is m1: 0.04~0.2mm, and adjacent scan lines are rotated 90° counterclockwise. The scan line spacing of each scan block in region B is m4: 0.03~0.2mm, and adjacent scan lines are rotated 90° counterclockwise.

[0049] During printing, the laser scans line by line along the fill line of each strip.

[0050] In the first shaping strategy of this invention, the strip width is different in each layer of slice data. Furthermore, during the execution of the first shaping strategy: based on the size setting of each strip, when performing the scanning task, the strips with two adjacent scan lines perpendicular to each other are first scanned. Then, the galvanometer of the laser jumps, and the laser scanning path changes accordingly, pointing to strips spaced one or more spaces away from the aforementioned two strips. The scanning of strips with two adjacent scan lines perpendicular to each other is then completed again, and so on, until the scanning task of all strips in the region is completed.

[0051] Specifically, when scanning region A, based on the size settings of each strip, the scanning process first scans any two adjacent, mutually perpendicular strips (one pair). Then, the galvanometer jumps, changing the laser scanning path, and then scans strips separated from the aforementioned two strips by one or more strips. This process of scanning two mutually perpendicular strips (one pair) is repeated until all strips in region A are scanned. Compared to existing technologies, this invention replaces the conventional strip-by-strip scanning with paired strip-interval scanning. By progressively reducing the length of the scanning line segments and minimizing the mutual influence of heat input from adjacent strips, heat accumulation is reduced, thereby solving the problems of uneven temperature and temperature gradients in the current forming cross-section.

[0052] When scanning region B, because its strip length is small and heat accumulation is small, each strip can be scanned sequentially, or strips in the same direction can be scanned sequentially. After scanning the same sequence of strips, the strips perpendicular to it can be scanned. Alternatively, the scanning method of region A can be used.

[0053] Based on this, to further reduce the non-uniformity of heat input to the formed cross-section parts, reduce the temperature gradient, reduce internal stress, and reduce the risk of deformation and cracking, the present invention further divides regions A and B, namely, a second forming strategy, as follows: Figure 9 As shown, region A is divided into rectangular scanning blocks of the same size with a length of L3: 0.5-5mm and a width of W3: 0.5-5mm. Region B is divided into rectangular scanning blocks of the same size with a length of L4: 0.2-5mm and a width of W4: 0.2-5mm. Each layer of the scanning blocks is the same size.

[0054] Considering the different heat dissipation effects at the bottom of regions A and B, L3 > L4 and W3 > W4 are set. This invention, through differentiated division, not only maintains the temperature uniformity and stability of regions A and B individually, but also ensures the overall temperature uniformity of both, reducing temperature deviation.

[0055] Next, fill the rectangular scan block with scan lines, please refer to [link to relevant documentation]. Figure 10In region A, the spacing between the fill scan lines of each scan block is m3: 0.06~0.3mm, and adjacent scan lines are rotated 15° counterclockwise. In region B, the spacing between the fill scan lines of each scan block is m4: 0.05~0.3mm, and adjacent scan lines are rotated 15° counterclockwise, and the following conditions are met: m2>m1; m4>m3.

[0056] The aforementioned scanning blocks and scanning lines are used to compensate for temperature non-uniformity in a certain area during the forming process. By using temperature sensors in the forming equipment to identify the temperature difference between a certain area and the surrounding area, if the temperature difference is greater than 30°C, the laser emits light, activating the corresponding scanning blocks and scanning lines in that area to emit light again for printing. Through secondary sintering, the temperature gradient is reduced, achieving adaptive temperature sensing, reducing heat input differences, and thus achieving adaptive control of the temperature gradient. Compared with existing technologies, this invention can reduce internal stress and reduce product deformation and cracking, especially for large-size, thick-walled parts, where it has excellent printing and forming effects.

[0057] The adaptive temperature-sensing 3D printing method disclosed in this invention can be specifically implemented as follows:

[0058] Step 1: Import the three-dimensional model of part A into the laser selective melting forming special slicing software to slice it, forming a series of slice data with a layer thickness of d1.

[0059] Step 2: Import the above slice data into the laser selective melting forming software, set the corresponding fill line and scanning strategy for each slice, and assign specific scanning speed, laser power, overlap and other parameters to each scanning line. The forming layer thickness is set to D. It should be noted that each slice data is assigned two completely different scanning strategies and sintering parameters.

[0060] This forms the printing program, which, unlike traditional scanning strategies, involves processing each slice of data according to... Figure 7 and Figure 8 The assigned scanning strategy and sintering parameters enable light-emitting printing for each layer (first forming strategy), while the slice data for each layer are processed according to... Figure 9 and Figure 10 The assigned scanning strategy and sintering parameters do not produce light printing for every or all scanned layers (second forming strategy), and the sintering parameters of the laser beam are significantly different for the same slice data in the two scanning strategies.

[0061] Step 3: Transfer the above printing program to the printing device. After completing routine operations such as powder spreading, leveling, air suction, and substrate heating, call the printing program to print.

[0062] Step 4: Before the part is formed to the right boundary t2 height of the triangular region, the part only scans the complete solid portion of a single cross-section. At this time, the heat input from the laser to part A can be efficiently transferred to the substrate for dissipation through the already formed portion. Since the part forming height is relatively low at this point, the heat dissipation effect on the substrate is good, the temperature difference within the forming area is not significant, the temperature sensor in the equipment will not be triggered, and part A only follows... Figure 7 and Figure 8 The scanning strategy and forming parameters shown are used for a single scan.

[0063] Step 5: As the forming height increases, the left and right boundaries of the triangular region begin to appear. At this point, part A is following... Figure 7 and Figure 8 The scanning strategy and forming parameters shown are used for a single scan. Laser power: 200-800W; laser scanning speed: 600-3000mm / s; laser beam scanning spacing: 0.05-0.2mm; laser beam overlap: 0.03-0.1mm. During the scanning process, the temperature sensor monitors in real time. After the current layer is scanned, the temperature of the entire forming area is scanned, and the temperature data of each area is transmitted to the control computer of the 3D printing equipment. The computer calculates the temperature difference of the entire forming area and marks and identifies the areas with lower temperatures in the current layer according to the temperature difference data T (20-50℃) set by the technician.

[0064] Step 6: The computer then processes the temperature difference signal and starts the scanning block and scanning strategy of the current layer in the area with the lower temperature, that is, starts the second forming strategy of the current layer.

[0065] Step 7, the laser follows the second property formation strategy of the current layer, with Figure 9 and Figure 10 The scanning block and scanning strategy shown perform a secondary scan on the low-temperature region identified by the temperature sensor. Unlike the first forming strategy, the laser power is lower (10-200W), the laser scanning speed is faster (1000-7000mm / s), the laser beam scanning spacing is larger (0.1-0.3mm), and the laser beam overlap is smaller (0-0.05mm). That is, by using lower power and higher speed, the low-temperature region identified by the temperature sensor is heated a second time with lower heat input, thereby achieving temperature uniformity, reducing the temperature gradient, and reducing internal stress.

[0066] In this embodiment, when the laser beam scans the lower temperature region, according to... Figure 9 and Figure 10 The scanning blocks shown may be closely connected or dispersed due to the low-temperature regions. When the laser emits light, it scans one or more blocks corresponding to the low-temperature regions according to the scanning strategy described above.

[0067] Step 8: After the scan is completed, the temperature sensor monitors the formed cross-section again, but the third scan is not initiated. The monitoring results are only used for data recording and are used for parameter correction during subsequent program settings.

[0068] Step 9: As the forming height increases again, regions A and B are scanned separately. The scanning strategy and parameter settings are as described above, so this step will not be repeated. Accordingly, the scanning block length of the first forming strategy in region A begins to decrease according to the definition above, further reducing heat input, thereby reducing the temperature gradient and achieving the purpose of reducing deformation and suppressing cracking.

[0069] Repeat the above steps in sequence until all forming layers have been scanned and printing is complete.

[0070] In the adaptive temperature sensing 3D printing method disclosed in this invention, the scanning block and scanning line are used to compensate for the temperature non-uniformity of a certain area during the forming process. The temperature sensor in the forming equipment identifies the temperature difference between a certain area and the surrounding area. If the temperature difference is greater than the preset temperature difference value, the laser emits light, and the corresponding scanning block and scanning line in that area emit light again for printing. Through secondary sintering, the temperature gradient is reduced and adaptive temperature sensing is achieved, which can effectively reduce the difference in heat input and thus achieve adaptive control of the temperature gradient. Compared with the prior art, this invention can reduce internal stress and reduce product deformation and cracking, especially for large-size and thick-walled parts, which have better printing and forming effects.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included within the scope of protection of the present invention.

Claims

1. An adaptive temperature-sensing 3D printing method, characterized in that, Includes the following steps: Step S1: Import the preset 3D model of part A into the laser selective melting forming special slicing software for slicing; Step S2: Import the slice data into laser selective melting and forming software, set the fill line and scanning strategy for each slice, the scanning strategy includes a first forming strategy and a second forming strategy, and then form a printing program; Step S3: The printing program is transmitted to the printing device, the printing program is invoked, and the light is emitted for printing; Step S4: Perform a single scan according to the first forming strategy, the first forming strategy including: The cross-sectional shape of part A is divided into one or more independent regions, and the independent regions are further divided into multiple parallel strips of a preset width. Each strip is filled with scan lines, and the scan lines in two adjacent strips are perpendicular to each other. Step S5: After the current layer is scanned, the temperature sensor in the printing device detects the temperature of the entire forming area and transmits the temperature data of each area of ​​the forming area to the control system of the printing device. The control system calculates the temperature difference of the entire forming area and marks the area where the temperature of the current layer is lower than the temperature difference data according to the preset temperature difference data. Step S6: For regions where the current layer temperature is lower than the temperature difference data, a second forming strategy is initiated. The second forming strategy includes: The cross-sectional shape of part A is divided into one or more independent regions. Each independent region is further divided into multiple rectangular scanning blocks of the same size. Scan lines are filled into each rectangular scanning block. The included angle between the scan lines of two adjacent rectangular scanning blocks is a preset acute angle. Step S7: After the scanning is completed, the temperature sensor will scan the entire forming area again and record the scan results. Then retrieve the next layer of slice data and repeat steps S4 to S7 until all forming layers of part A are printed.

2. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In the first shaping strategy, the strip width is different in each layer of slice data.

3. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, During the execution of the first forming strategy: based on the size setting of each strip, when performing the scanning task, the strips with two adjacent scanning lines perpendicular to each other are first scanned. Then the galvanometer of the laser jumps, and the laser scanning path changes accordingly, pointing to the strips that are separated from the two strips by one or more. The scanning of the strips with two adjacent scanning lines perpendicular to each other is completed again. This process is repeated until the scanning task of all strips in the region is completed.

4. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In the second forming strategy, the angle between the scan lines in two adjacent rectangular scan blocks is 15°.

5. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In step S2, parameters including scanning speed and laser power are set for each scan line, and the forming layer thickness is set to D.

6. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In step S5, the preset temperature difference data T is 20℃~50℃.

7. The adaptive temperature-sensing 3D printing method as described in claim 6, characterized in that, In step S5, the preset temperature difference data T is 30℃.

8. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In step S4, the two or more independent regions divided according to the cross-sectional shape of the part A are either connected to each other or separated from each other.

9. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In step S3, after the printing program is transferred to the printing device, operations including powder spreading, leveling, air suction, and substrate heating are performed.

10. The adaptive temperature-sensing 3D printing method as described in claim 1, characterized in that, In step S5, the control system calculates the temperature difference across the entire forming area: if the current layer does not have an area with a temperature lower than the temperature difference data, then step S6 is skipped and step S7 is executed.

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