Efficient large-layer-thickness additive manufacturing forming method for injection mold

Abstract

The invention relates to the technical field of additive manufacturing, and provides an injection mold fine large-layer-thickness additive manufacturing forming method which comprises the steps that 3D printing is conducted on a metal material through an SLM technology; during 3D printing, the ratio of the diameter of a molten pool to the depth of the molten pool is 1.41-1.9, and the overlapping width of the molten pool is 0.07-0.14. Through the synergistic effect of the ratio of the diameter of the molten pool to the depth of the molten pool and the overlapping width of the molten pool, in the whole 3D printing process of the printed piece, most conventional laser equipment in the market can be adopted, the 3D printing method is suitable for large-size raw materials, the printing efficiency is high, and when the thickness of a single layer reaches 80 microns, the thickness of the single layer reaches 80 microns. And stable, high-performance, high-compactness, low-cost and efficient additive manufacturing machining forming can be achieved, and the method is suitable for market popularization and has very important technical significance.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a high-efficiency and large-layer-thickness additive manufacturing forming method for an injection mold. Background Art

[0002] As a new type of processing technology, metal additive manufacturing can realize the conformal design and manufacturing of water channels in the field of manufacturing injection mold inserts, and has the advantages of shortening the mold manufacturing cycle, reducing the injection molding cycle and improving the injection molding yield rate. Among them, the most common metal additive manufacturing method is selective laser melting (SLM), but its high printing cost has hindered its market promotion to a certain extent. The core cost of selective laser melting metal additive manufacturing lies in the equipment machine time cost and metal powder material. Therefore, the molding rate and powder price are the two core factors to reduce manufacturing costs.

[0003] In order to improve the processing efficiency of additive manufacturing in mold processing, patent application CN116372190A proposes to use a shell-core structure, divide the parts into surface areas and internal areas, and configure different layer thicknesses and processing parameters for different areas. Specifically, a laser power of 100W to 400W and a layer thickness of 0.03 to 0.1 are used in the surface area, and the corresponding formula is used in the internal area to calculate the required processing parameters. Although this method can achieve large-layer additive manufacturing, its shell-core structure design, the identification of the surface and inner layers during printing, and the specific calculation method of the inner area printing parameters make this method complex to operate and highly equipment-dependent, and it is still difficult to promote and apply.

[0004] In order to reduce the cost of powder, patent application CN114160809A uses large-particle powder as raw material to obtain a high-power, large-layer-thickness selective laser melting forming method with a layer thickness of not less than 100um. However, the implementation of this method also requires increasing the laser power, which is not suitable for the common 3D printing equipment below 500W in the market. It has a very limited effect on reducing the cost of selective laser melting metal additive manufacturing. Moreover, this method has not considered the application performance of the manufactured material, such as material hardness, structural density, mechanical properties, etc.

[0005] Therefore, there is still an urgent need for a simple, low-cost, efficient metal additive manufacturing method that meets the application requirements of injection molds to promote the further promotion and application of metal additive manufacturing. Summary of the invention

[0006] The purpose of the present invention is to provide an efficient and large-layer thickness additive manufacturing forming method for injection molds, so as to achieve simple, high-performance, high-density, low-cost and efficient additive manufacturing processing and forming.

[0007] Specifically, by controlling the printer parameter process and the size of the raw material powder, the size of the molten pool formed by the laser melting powder can be three-dimensionally regulated, the proportional relationship between the molten pool diameter and the molten pool depth, as well as the molten pool overlapping width can be controlled, so that this method can be used with low-cost powder materials of 15 to 105um, realizing low-cost and efficient additive manufacturing printing.

[0008] Specifically, the present invention provides an additive manufacturing forming method, comprising: 3D printing a metal material using a SLM process;

[0009] During the 3D printing, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.9, and the molten pool overlap width is 0.07 to 0.14;

[0010] Preferably, during the 3D printing, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.64, and the molten pool overlap width is 0.08 to 0.13.

[0011] Further preferably, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.44, and the molten pool overlap width is 0.095 to 0.11 mm.

[0012] According to the additive manufacturing forming method provided by the present invention, the layer thickness during 3D printing is greater than 50 μm; preferably 60 to 90 μm, and more preferably 80 μm.

[0013] The additive manufacturing forming method provided by the present invention comprises: during the 3D printing, the diameter of the molten pool is 0.21 to 0.24 mm, the laser power is 100 to 500 W, and the scanning speed is 700 to 1200 mm / s;

[0014] Preferably, the diameter of the molten pool is 0.23-0.24 mm, the laser power is 200-350 W, and the scanning speed is 900-1150 mm / s.

[0015] According to the additive manufacturing forming method provided by the present invention, the metal material is mainly composed of spherical metal material;

[0016] Preferably, the metal material has a Ni content of 17.0-19.0wt%, a Mn content of ≤0.10wt%, a Ti content of 0.60-1.0wt%, a Co content of 8.50-9.50wt%, a Mo content of 4.50-5.20wt%, a Si content of ≤0.1wt%, a C content of ≤0.03wt%, a P content of ≤0.015wt%, a S content of ≤0.015wt%, an O content of ≤0.03wt%, a N content of ≤0.03wt%, and a balance of Fe;

[0017] More preferably, the metal material is a die steel MS1 spherical powder material.

[0018] According to the additive manufacturing forming method provided by the present invention, the particle size distribution of the spherical metal material is 15 to 105 μm;

[0019] Preferably, the D10 of the spherical metal material is 15-25 μm, the D50 is 40-50 μm, and the D90 is 90-105 μm;

[0020] More preferably, the spherical metal material has a D10 of 20 μm, a D50 of 45 μm, and a D90 of 90 μm.

[0021] The additive manufacturing forming method provided by the present invention comprises: performing aging heat treatment after 3D printing, the heat treatment temperature is 400-600°C, preferably 480-560°C

[0022] The additive manufacturing forming method provided by the present invention comprises: setting a single layer thickness of a part to be printed;

[0023] Setting 3D printing process parameters of the part to be printed; the 3D printing process parameters include: laser power, molten pool overlap width and scanning speed;

[0024] Using SLM technology, 3D printing is performed using mold steel MS1 spherical masonite material as raw material;

[0025] The printed parts obtained by 3D printing are subjected to aging heat treatment.

[0026] In a second aspect, the present invention also provides a product produced by the additive manufacturing forming method as described above.

[0027] In a third aspect, the present invention also provides the use of the above-mentioned product in an injection mold.

[0028] In a fourth aspect, the present invention further provides a 3D printing system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the additive manufacturing method as described above when executing the program.

[0029] The present invention provides an injection mold high-efficiency large-layer thickness additive manufacturing forming method. Through the synergistic effect of the two technical parameters of the ratio of the molten pool diameter to the molten pool depth and the molten pool overlap width, the 3D printing process of the entire printed part can not only use the most conventional laser equipment on the market, but also is suitable for large-size raw materials, with high printing efficiency. When the single-layer thickness reaches 80μm, stable high-performance, high-density, low-cost and efficient additive manufacturing processing can be achieved, which is suitable for market promotion and has very important technical significance.

[0030] Specifically, the present invention uses a common 100-500W laser, which is more suitable for the common injection mold printing equipment in the market. Using 15-105um diameter metal powder, the powder utilization rate of printing injection molds is increased by 30%-40% compared with the common 15-53um diameter powder in the market, and the powder cost is reduced by 35%-45%. Compared with the common 30-50um layer thickness in the market, the printing efficiency is increased by 70%-150%, and the printing cost per gram can be reduced to 35%-50% of the original cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of two adjacent molten pools provided by the present invention;

[0033] Figure 2 is a metallographic image of the printout of Example 1 provided by the present invention;

[0034] Figure 3 is a metallographic image of a printout of Example 4 provided by the present invention;

[0035] Figure 4 This is the injection mold diagram printed in Example 1 provided by the present invention;

[0036] Figure 5 4 is a relationship diagram between the hardness and R / D of the printed parts of Examples 1 to 6 provided by the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Combine the following Figure 1-Figure 5 The invention describes an efficient large-layer-thickness additive manufacturing forming method for an injection mold, the method comprising: 3D printing a metal material using an SLM process;

[0039] During the 3D printing, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.64, and the molten pool overlap width is 0.08 to 0.13;

[0040] Preferably, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.44, and the molten pool overlap width is 0.095 to 0.11 mm.

[0041] The technical parameters describing the molten pool mainly include the molten pool diameter and the molten pool depth. In the related art, in the method of additive manufacturing, there is obviously no exploration of the degree of influence of the molten pool on the performance of additive manufacturing products from the perspective of the molten pool. The present invention finds that when the SLM process is used for 3D printing to achieve additive manufacturing, the ratio of the molten pool diameter to the molten pool depth and the molten pool overlap width, these two technical parameters have an important influence on the application performance of the printed part. With the synergistic effect of the two, the 3D printing process of the entire printed part can use the most conventional laser equipment on the market, and is suitable for large-sized raw materials with high printing efficiency. When the single-layer thickness reaches 80μm, the comprehensive performance of the obtained printed part is excellent, and the metallographic density reaches 99.8%, which is of great technical significance for the expanded application of 3D printing technology in the field of injection molds under the SLM process.

[0042] In an embodiment of the present invention, the layer thickness during 3D printing is greater than 50 μm, preferably 60 to 90 μm, and more preferably 80 μm.

[0043] Generally speaking, the thicker the single layer, the higher the requirements for the laser and the higher the manufacturing efficiency. The present invention optimizes the ratio of the molten pool diameter to the molten pool depth and the molten pool overlap width to achieve low-cost and high-efficiency preparation of printed parts with excellent application performance when the single layer thickness is about 80μm.

[0044] In an embodiment of the present invention, during the 3D printing, the diameter of the molten pool is 0.21-0.24 mm, the laser power is 100-500 W, and the scanning speed is 700-1200 mm / s;

[0045] Preferably, the diameter of the molten pool is 0.23-0.24 mm, the laser power is 200-350 W, and the scanning speed is 900-1150 mm / s.

[0046] In an embodiment of the present invention, the metal material is mainly composed of spherical metal material;

[0047] Preferably, the metal material has a Ni content of 17.0-19.0wt%, a Mn content of ≤0.10wt%, a Ti content of 0.60-1.0wt%, a Co content of 8.50-9.50wt%, a Mo content of 4.50-5.20wt%, a Si content of ≤0.1wt%, a C content of ≤0.03wt%, a P content of ≤0.015wt%, a S content of ≤0.015wt%, an O content of ≤0.03wt%, a N content of ≤0.03wt%, and a balance of Fe;

[0048] More preferably, the metal material is a die steel MS1 spherical powder material.

[0049] The preferred metal materials mentioned above are low in cost, easy to obtain and have a wide range of applications.

[0050] In an embodiment of the present invention, the particle size distribution of the spherical metal material is 15 to 105 μm;

[0051] Preferably, the D10 of the spherical metal material is 15-25 μm, the D50 is 40-50 μm, and the D90 is 90-105 μm;

[0052] More preferably, the spherical metal material has a D10 of 20 μm, a D50 of 45 μm, and a D90 of 90 μm.

[0053] The smaller the particle size of the metal material that can be used for 3D printing, the higher the cost. The metal material selected in the present invention is not limited to the above size. As long as it can be normally carried out under the control of the above printing parameters during printing, it is suitable for the present invention. Considering the cost, large-size technical materials are preferred. The size of the metal material cooperates with each other to help form a dense structure.

[0054] In the embodiment of the present invention, aging heat treatment is performed after 3D printing, and the heat treatment temperature is 400-600°C, preferably 480-560°C.

[0055] Aging heat treatment is a conventional process after 3D printing by SLM process. After tempering, it is beneficial to stabilize and improve the performance of the printed parts. After the above-mentioned process treatment of the present invention, the temperature during aging heat treatment of the present invention can be further reduced and the energy consumption can be reduced.

[0056] In an embodiment of the present invention, the method comprises:

[0057] Set the single layer thickness of the part to be printed;

[0058] The 3D printing process parameters of the part to be printed are set; the 3D printing process parameters include: laser power, molten pool overlap width, scanning speed, scanning start angle and layer-by-layer scanning rotation angle; wherein the scanning start angle is 30-40° and the layer-by-layer scanning rotation angle is 65-70°.

[0059] Using SLM technology, 3D printing is performed using mold steel MS1 spherical masonite material as raw material;

[0060] The printed parts obtained by 3D printing are subjected to aging heat treatment.

[0061] In an embodiment of the present invention, the products produced by the additive manufacturing method include, but are not limited to, various inserts that can be used in injection molds.

[0062] In an embodiment of the present invention, the additive manufacturing forming method can also be implemented by a program, such as a 3D printing system, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the additive manufacturing forming method when executing the program.

[0063] The method of the present invention and the prints obtained therefrom are described below by means of more specific embodiments, wherein the particle size distribution of the spherical powder material of the mold steel MS1 is 15 to 105 μm, D10 is 20 μm, D50 is 45 μm, and D90 is 90 μm.

[0064] Example 1

[0065] An efficient and thick layer additive manufacturing method for injection molds, using SLM technology for 3D printing, the specific steps are as follows:

[0066] (1) Set the single layer thickness of the printed test bar to 80 μm in the slicing software.

[0067] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 300 W, molten pool overlap width 0.1 mm, scanning speed 900 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0068] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.242 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.415.

[0069] (4) The printed parts obtained by 3D printing were subjected to aging heat treatment at a temperature of 540°C for 2 h to obtain a finished test rod.

[0070] Example 2

[0071] A high-efficiency and large-layer thickness additive manufacturing method for injection molds is basically the same as Example 1, except that the only difference is step (2) and step (3):

[0072] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 300 W, molten pool overlap width 0.1 mm, scanning speed 950 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0073] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.237 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.428.

[0074] Example 3

[0075] A high-efficiency and large-layer thickness additive manufacturing method for injection molds is basically the same as Example 1, except that the only difference is step (2) and step (3):

[0076] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 350 W, molten pool overlap width 0.1 mm, scanning speed 1000 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0077] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.234 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.436.

[0078] Example 4

[0079] A high-efficiency and large-layer thickness additive manufacturing method for injection molds is basically the same as Example 1, except that the only difference is step (2) and step (3):

[0080] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 250 W, molten pool overlap width 0.1 mm, scanning speed 900 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0081] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.230 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.533.

[0082] Example 5

[0083] A high-efficiency and large-layer thickness additive manufacturing method for injection molds is basically the same as Example 1, except that the only difference is step (2) and step (3):

[0084] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 200 W, molten pool overlap width 0.1 mm, scanning speed 900 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0085] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.222 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.644.

[0086] Example 6

[0087] A high-efficiency and large-layer thickness additive manufacturing method for an injection mold is basically the same as Example 1, except that:

[0088] (2) The 3D printing process parameters of the test rod to be printed were set as follows: laser power 150 W, molten pool overlap width 0.1 mm, scanning speed 900 mm / s, scanning starting angle 37°, and layer-by-layer scanning rotation angle 67°.

[0089] (3) The SLM process was used to perform 3D printing using mold steel MS1 spherical powder material as raw material; during 3D printing, the molten pool diameter was controlled to be 0.215 mm, and the ratio of the molten pool diameter to the molten pool depth was set to 1.991.

[0090] Example 7

[0091] A high-efficiency, large-layer-thickness additive manufacturing method for an injection mold is basically the same as Example 1, except that the molten pool overlap width is 0.075 mm and the scanning speed is 900 mm / s.

[0092] Example 8

[0093] A high-efficiency, large-layer-thickness additive manufacturing method for an injection mold is basically the same as Example 1, except that the molten pool overlap width is 0.08 mm and the scanning speed is 900 mm / s.

[0094] Example 9

[0095] A high-efficiency, large-layer-thickness additive manufacturing method for an injection mold is basically the same as Example 1, except that the molten pool overlap width is 0.13 mm and the scanning speed is 900 mm / s.

[0096] Example 10

[0097] A high-efficiency, large-layer-thickness additive manufacturing method for an injection mold is basically the same as Example 1, except that the molten pool overlap width is 0.135 mm and the scanning speed is 900 mm / s.

[0098] The hardness, tensile strength, yield strength and metallographic density of the test bars obtained in Examples 1 to 12 were tested. The test results are shown in Table 1:

[0099] Specific embodiments R / D W Hardness HRC tensile strength Yield Strength Metallographic density Example 1 1.415 0.1 48.9 1782Mpa 1746Mpa 99.96％ Example 2 1.428 0.1 48.7 1688Mpa 1652Mpa 99.84％ Example 3 1.436 0.1 48.5 1675Mpa 1634Mpa 99.80％ Example 4 1.533 0.1 46.5 1452Mpa 1387Mpa 98.25％ Example 5 1.644 0.1 45.7 1265Mpa 1217Mpa 96.61％ Example 6 1.991 0.1 43.4 954Mpa 895Mpa 88.32％ Example 7 1.415 0.075 42.7 1126Mpa 1087Mpa 95.63％ Example 8 1.415 0.8 43.5 1350Mpa 1285Mpa 98.26％ Example 9 1.415 0.13 42.3 1236Mpa 1189Mpa 98.33％ Example 10 1.415 0.135 41.3 1041Mpa 992Mpa 95.74％

[0100] In Table 1, R represents the molten pool diameter, W represents the molten pool overlap width, and D represents the molten pool depth. The corresponding relationship between the three on the molten pool is as follows: Figure 1 shown. Figure 4Print the finished product image of the test bar and injection mold for Example 1. Figure 2 and Figure 3 The metallographic structure diagrams of the printed parts of Example 1 and Example 4 are shown in Table 1 and the figure above. It can be seen that different printing parameters have an impact on the hardness, tensile strength, yield strength, and metallographic density of the printed parts. Specifically:

[0101] It was found in the experiment that when R / D is less than 1.415, such as 1.39, 1.40 or 1.41, high-value devices such as high-power lasers must be configured to make the laser power reach more than 1000W to obtain prints with usable performance, which does not have comprehensive cost-effectiveness and large-scale market promotion. Figure 5 As shown, it can be seen from Examples 1 to 6 that as the molten pool diameter R decreases, the ratio of the molten pool diameter to the molten pool depth R / D increases to a critical value exceeding 1.415, and the mechanical properties begin to decline. The larger the ratio value, the more obvious the performance decline.

[0102] It can be seen from Examples 7 to 10 that when the molten pool overlap width W is around 0.1 mm, the application performance of the printed part is better and the structure is denser. When W is too large or too small, it is not conducive to the mechanical properties of the printed part.

[0103] When the ratio of the molten pool diameter to the molten pool depth is 1.41-1.44 and the molten pool overlap width is 0.095-0.11 mm, the comprehensive mechanical properties of the printed part are optimal, and the metallographic density reaches more than 99.8%.

[0104] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An additive manufacturing method, It is characterized in that include: Use SLM technology to 3D print metal materials; During the 3D printing, the ratio of the molten pool diameter to the molten pool depth is 1.41 to 1.9, and the molten pool overlap width is 0.07 to 0.

14.

2. The additive manufacturing method according to claim 1, It is characterized in that The layer thickness during 3D printing is greater than 50 μm, preferably 60 to 90 μm, and more preferably 80 μm.

3. The additive manufacturing method according to claim 1 or 2, It is characterized in that include: During the 3D printing, the diameter of the molten pool is 0.21-0.24 mm, the laser power is 100-500 W, and the scanning speed is 700-1200 mm / s; Preferably, the diameter of the molten pool is 0.23-0.24 mm, the laser power is 200-350 W, and the scanning speed is 900-1150 mm / s.

4. The additive manufacturing method according to any one of claims 1 to 3, It is characterized in that The metal material is mainly composed of spherical metal material; Preferably, the metal material has a Ni content of 17.0-19.0wt%, a Mn content of ≤0.10wt%, a Ti content of 0.60-1.0wt%, a Co content of 8.50-9.50wt%, a Mo content of 4.50-5.20wt%, a Si content of ≤0.1wt%, a C content of ≤0.03wt%, a P content of ≤0.015wt%, a S content of ≤0.015wt%, an O content of ≤0.03wt%, a N content of ≤0.03wt%, and a balance of Fe; More preferably, the metal material is a die steel MS1 spherical powder material.

5. The additive manufacturing method according to claim 4, It is characterized in that The particle size distribution of the spherical metal material is 15 to 105 μm; Preferably, the D10 of the spherical metal material is 15-25 μm, the D50 is 40-50 μm, and the D90 is 90-105 μm; More preferably, the spherical metal material has a D10 of 20 μm, a D50 of 45 μm, and a D90 of 90 μm.

6. The additive manufacturing method according to any one of claims 1 to 5, It is characterized in that include: After 3D printing, an aging heat treatment is performed, and the heat treatment temperature is 400-600°C, preferably 480-560°C.

7. The additive manufacturing method according to any one of claims 1 to 6, It is characterized in that include: Set the single layer thickness of the part to be printed; Set the 3D printing process parameters of the parts to be printed; The 3D printing process parameters include: laser power, molten pool overlap width and scanning speed; Using SLM technology, 3D printing is performed using mold steel MS1 spherical masonite material as raw material; The printed parts obtained by 3D printing are subjected to aging heat treatment.

8. A product obtained by the additive manufacturing method according to any one of claims 1 to 7.

9. Use of the product according to claim 8 in an injection mold.

10. A 3D printing system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the additive manufacturing method according to any one of claims 1 to 7 is implemented.

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