A method of manufacturing an aluminum alloy conical metal piece

Abstract

A kind of manufacturing method of aluminum alloy conical metal piece, the conical piece is divided into regions, and the composite manufacturing method of additive manufacturing + welding is used, and based on finite element method, the excess material in the conical piece is reduced by stress size and distribution, a lightweight cavity structure is realized, the weight of the conical piece is reduced by 5-10% compared with solid structure, further reducing the material consumption and forming time of additive manufacturing, and the weight reduction of the conical piece is also realized.The large end of the conical piece is processed from a forging, as the forging has high density and few defects, the problem of mechanical property reduction of the large end of the conical piece caused by micro-porosity and small defects in the process of 3D printing of large-size conical piece is solved.The production cost is effectively reduced, and the production cycle of single product is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of machining, specifically a lightweight forming and manufacturing method for tapered parts, addressing the need for weight reduction and the manufacturing process. Background Technology

[0002] Conical metal components are among the key conical parts in aerospace equipment, composed of multiple components. Traditional manufacturing processes typically involve casting or forging blanks, followed by heat treatment and machining. These metal structural components are generally designed and manufactured based on traditional processing techniques (such as forging, casting, and machining). Due to the limitations of traditional manufacturing processes, the internal structure of conical components is mostly solid, and the internal material cannot be fully utilized. In recent years, to achieve lightweighting and reduce structural weight, lightweight hollow conical components (diameter over 600mm and height over 500mm) are needed. However, using traditional methods, hollow casting results in low dimensional accuracy and poor quality, failing to meet these requirements. While laser 3D printing can achieve integral forming of such structures, the problems of uncontrollable defects, low mechanical properties, low printing efficiency, and high cost associated with 3D printing large-sized conical components (diameter over 500mm) remain unresolved.

[0003] Selective laser melting (SLM) is a process in which a laser beam rapidly melts metal powder according to CAD drawing data, layer by layer "stacking" it into various complex shapes and near-100% density metal conical parts. It has unique advantages in processing complex structures, variable cross-sections, and irregularly shaped components, offering high forming accuracy and high material utilization. In recent years, SLM technology has gradually begun to be applied in the aerospace field. Topology optimization is a mathematical method that optimizes the material distribution within a given region based on given load conditions, constraints, and performance indicators; it is a method of structural optimization.

[0004] The invention patent with application number 202011489777.0 discloses an additive manufacturing method for complex high-strength aluminum alloy structures, which reduces the surface roughness of the formed parts by optimizing the selective laser melting forming process. However, this patent does not propose a technical solution on how to achieve lightweight manufacturing.

[0005] The invention application with application number 202010738832.9 discloses a process for laser additive manufacturing of high-strength aluminum alloy structures, which can realize the forming of complex conical parts such as biomimetic structures and topology-optimized structures, with aluminum alloy strength reaching over 530 MPa. However, this technology cannot solve the problems of long cycle time, low efficiency, and high cost of 3D printing for large-size conical parts.

[0006] An invention patent application (application number 202311647464.7) discloses a composite manufacturing method for TC11 titanium alloy thin-walled cylinders. Based on the concept of 3D printing + welding composite manufacturing, and according to the workpiece size and structural characteristics, the complex-shaped parts of the thin-walled cylinder are prepared using selective laser melting, while the other part is prepared using forging machining. This additive manufacturing + welding composite method for TC11 titanium alloy thin-walled cylinders solves the problem of integrated forming of large-size aerospace structural components limited by the volume of atmosphere or vacuum chambers, achieving optimized combination of processing resources while balancing processing efficiency and material utilization. However, this patent focuses on a cylindrical structure with a simple structure, making it impossible to manufacture the conical parts described in this invention. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, such as low mechanical properties, inability to reduce weight and lightness, and low processing efficiency, this invention proposes a method for manufacturing aluminum alloy tapered metal parts.

[0008] 1. A method for manufacturing an aluminum alloy conical metal part, characterized in that the specific process is as follows:

[0009] Step 1, determine the process plan:

[0010] The determined process plan is as follows: a segmented welding method is adopted, the small end of the tapered part is integrally printed using SLM laser powder coating, and the large end is machined using forging; the small end and the large end are then welded, heat-treated, and machined to finally form the product.

[0011] Step 2, division of the tapered component area:

[0012] The tapered component is divided into two sections: a small-end tapered section and a large-end tapered section. The ratio of the length of the small end to the length of the large end is 2:3.

[0013] Step 3, weight reduction design:

[0014] The stress conditions of the three-dimensional model structure at the small end of the tapered part are calculated using finite element simulation software. Areas with internal stress <10 MPa are reduced or removed in the three-dimensional model. Based on this, the three-dimensional model is reconstructed to form a three-dimensional model with a cavity structure to achieve weight reduction.

[0015] I. Model the tapered component using 3D modeling software according to the design drawings to obtain a 1:1 3D model of the tapered component. After the small end is modeled in 3D, import it into the finite element simulation software.

[0016] II. Assign material properties to the 3D model of the tapered component in the finite element software, including the material's density, Young's modulus, tensile strength, and yield strength.

[0017] The material has a density of 2.7 g / cm3, a Young's modulus of 73 GPa, a tensile strength of 350 MPa, and a yield strength of 280 MPa. A pressure of 2 MPa is uniformly applied to the inner surface of the three-dimensional model. Fixed surface constraints are added to the upper and lower ends of the conical model to completely constrain the upper and lower surfaces and prevent displacement.

[0018] Ⅲ. The stress values ​​and distribution of the model were calculated using finite element software.

[0019] IV. Based on the obtained stress values ​​and their distribution cloud maps, the areas with stress values ​​less than 10 MPa are recorded.

[0020] V. The model was recreated using 3D modeling software. During the modeling process, solid parts in areas with stress values ​​<10 MPa were removed to form a 3D model of a conical part with a cavity.

[0021] Step 4, Performance Verification:

[0022] The performance verification includes yield strength and safety factor.

[0023] The optimized conical model obtained in step 3 was imported into the finite element software. A pressure of 2 MPa was uniformly applied to the inner surface of the three-dimensional model, and fixed constraints were applied to the upper and lower ends of the conical model. The simulation calculation showed that the maximum stress of the conical part was 190 MPa, the yield strength of the material of the conical part was 280 MPa, and the safety factor was 1.47. It was determined that the optimized structure met the usage requirements.

[0024] Step 5, Raw material selection:

[0025] The large end of the tapered part is manufactured using forging machining process, with ring forgings as the raw material. Based on the mechanical performance requirements of the product, namely the tensile strength ≥350Mpa and the yield strength ≥280Mpa, aluminum alloy 2219 is selected as the material grade.

[0026] The small end of the tapered part is formed using 3D printing technology, with AlSi7Mg powder as the raw material.

[0027] Step 6: Manufacturing the small end of the tapered component:

[0028] The 3D model generated in step 2 is processed using Magics software. The 3D model is cut into equal-thickness slices along the height direction, with each slice having a thickness of 0.03 mm, to obtain the slice scanning data at the small end. This slice scanning data is then imported into the selected area laser melting device.

[0029] The process parameters for selective laser melting were determined as follows: laser power of 280W; scanning speed of 1200mm / s; scanning spacing of 0.08mm; and layer thickness of 0.03mm.

[0030] The small end of the tapered part is obtained through 3D printing.

[0031] The specific process for manufacturing the small end of the tapered component is as follows:

[0032] Scan the first layer:

[0033] The obtained alloyed powder is placed into the forming chamber of the selective laser melting device. A scraper is used to spread the powder, forming a first powder bed with a thickness of 0.03 mm. The laser melting device is then activated, and the molten powder bed is scanned according to the determined layer scanning data. The scanning path is a straight line.

[0034] Scan the second layer:

[0035] After completing the first layer scan, a scraper is used to spread powder onto the molten first layer of powder, forming a second powder bed; the powder bed thickness is 0.03 mm. The laser is then activated to scan the molten powder bed according to the layer scan data; the scanning path is a straight line.

[0036] Scan the third layer:

[0037] A third powder bed is formed by spreading powder onto the second powder bed using a scraper. The powder layer thickness is 0.03 mm. The laser is then activated, and the molten powder bed is scanned based on the obtained layer scanning data; the scanning path is a straight line.

[0038] Repeat the laser melting process from the second layer of powder to the third layer of powder until the set height is reached. This completes the 3D printing of the small end of the conical part.

[0039] Step 7, Aging Heat Treatment:

[0040] Under the support fixture, the small end preform is subjected to aging heat treatment.

[0041] The small-end preform is placed in a heat treatment furnace using a support fixture. The furnace is heated to 165±5℃ at a heating rate of 3℃ / min and held for 240±5min. After holding, the preform is cooled with the furnace. The heat-treated small-end preform is obtained.

[0042] Step 8, Machining the small end of the tapered part:

[0043] The small end of the tapered part is obtained through machining; it is ready for use.

[0044] Step 9, enlarge the end of the machine:

[0045] The large-end semi-finished product is obtained through machining; ready for use.

[0046] An I-shaped bevel is machined at the welding area of ​​the large end for welding to the small end. This yields a semi-finished large end; ready for use.

[0047] Step 10, Clean the bevel:

[0048] The welding parts of the small-end semi-finished product and the welding parts of the large-end semi-finished product are cleaned to prepare for welding.

[0049] Step 11, Assembly and Welding:

[0050] The large end semi-finished product of the conical part and the small end semi-finished product of the conical part are assembled and then welded by electron beam under the constraint of the supporting fixture. This yields a semi-finished conical metal part.

[0051] The electron beam welding process parameters are as follows: accelerating voltage 60 kV, electron beam current 75 mA, focusing current 2205 mA, welding speed 800 m / s; aging treatment process parameters are 130 ± 5 °C, holding time 330 ± 30 min, and air cooling.

[0052] Step 12, finishing:

[0053] According to the design drawings, the semi-finished conical metal parts are precision machined to obtain aluminum alloy conical metal parts.

[0054] This completes the manufacturing of the aluminum alloy tapered metal part.

[0055] Existing technologies using traditional machining methods suffer from low material utilization (only 8%–10%) due to the forging of the blank, resulting in bulky, thick, and solid products that fail to meet lightweight requirements. While laser 3D printing is used for integral forming, the efficiency of 3D printing large-sized conical parts is very low, the cycle time is long, and micropores and defects formed during the printing process affect the mechanical properties of the product. To overcome these problems, this invention proposes a method for additive manufacturing aluminum alloy conical metal parts.

[0056] Additive manufacturing technology is widely used, but it suffers from low efficiency and high cost. This invention, based on the dimensions of the conical component and considering manufacturing cost economy, divides the conical component into regions and employs a "additive manufacturing + welding" composite method. For the parts that can be additively manufactured, finite element method simulation is used to calculate their stress magnitude and distribution, reducing "redundant material" inside the conical component to achieve a lightweight cavity structure. This further reduces material consumption and forming time in additive manufacturing, while also achieving weight reduction for the conical component.

[0057] This invention relates to a method for manufacturing a conical aluminum alloy metal component with a cavity structure. The method is characterized by: based on the concept of "additive manufacturing + welding" composite manufacturing, and considering the structural characteristics of the workpiece, processing efficiency, material consumption, time, and the working cavity size of the selective laser melting equipment, dividing the entire conical component into two parts. The additively manufactured part undergoes structural optimization and weight reduction, while the part with the cavity is prepared using selective laser melting. The other part is prepared using forging turning and milling methods.

[0058] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0059] 1. Compared with the technology of laser 3D printing for integral manufacturing, the present invention uses a forging process for the large end of the conical part. Due to the high density and few defects of forging, the problem of reduced mechanical properties of the large end of the conical part caused by micropores and small defects during the 3D printing of large-size conical parts can be solved.

[0060] 2. This invention uses an additive manufacturing + welding composite method to manufacture a conical structural part with a cavity structure. Since most of the conical metal part is machined, and machining is more efficient and cheaper than laser 3D printing, the cost can be reduced by 30% to 50% and the production cycle of a single product can be reduced by about 20 days compared with laser 3D printing for integral forming.

[0061] 3. The stress of the three-dimensional model of the conical part is calculated using finite element simulation software. Material in areas with low internal stress is reduced or removed. Based on this, the three-dimensional model is reconstructed to form a three-dimensional model with a cavity structure at the small end. After forming by additive manufacturing, the weight of the conical part can be reduced by 5% to 10% compared to the solid structure. Attached Figure Description

[0062] Figure 1 This is a diagram of the tapered structure component in the embodiment.

[0063] Figure 2 This is a schematic diagram of the segmented conical component in the embodiment.

[0064] Figure 3 This is a schematic diagram of the little-endian optimized structure of the embodiment; wherein, Figure 3 'a' is the main view. Figure 3 b is Figure 3 View of a from direction B, Figure 3 c is Figure 3 Sectional view along direction AA in section a.

[0065] Figure 4 This is a simulation verification stress cloud diagram of the structure after weight reduction in the embodiment; among which, Figure 4 a is a cross-sectional view of the stress cloud diagram of the verification simulation after the weight reduction of the tapered part. Figure 4 b is a side view of the stress cloud diagram of the simulation after weight reduction of the tapered part.

[0066] Figure 5 This is a schematic diagram of the technical solution of the present invention.

[0067] Figure 6 This is a flowchart of the present invention. Detailed Implementation

[0068] This embodiment is a method for manufacturing an aluminum alloy conical metal part. The conical part has a large end diameter of φ860mm, a small end diameter of φ300mm, and a height of 600mm. The inner surface of the small end needs to withstand a pressure of 2MPa, and the outer surface of the large end needs to withstand a tensile load of 20000N.

[0069] Step 1, determine the process plan:

[0070] The tapered part is assembled and welded in sections. The small end of the tapered part is integrally printed using SLM laser powder coating, while the large end is machined using forging. Then, the parts are assembled, heat-treated, and machined to form the final product.

[0071] Step 2, division of the tapered component area:

[0072] Based on the fact that the large end of a certain type of solid rocket motor's conical component bears a nozzle oscillation load of 20,000 N, and the inner surface of the small end of the conical component bears a pressure of 2 MPa, the conical component is divided into two sections at a distance of 240 mm from the end face of the small end, i.e., a division ratio of approximately 2:3: the small end conical section and the large end conical section. The large end will be manufactured using traditional forging methods, while the small end will be manufactured using selective laser melting (SLM).

[0073] Step 3, weight reduction design:

[0074] I. Model the tapered component using 3D modeling software according to the design drawings to obtain a 1:1 3D model of the tapered component. After the small end is modeled in 3D, import it into the finite element simulation software.

[0075] II. Assign material properties to the 3D model of the tapered component in the finite element software, including the material's density, Young's modulus, tensile strength, and yield strength.

[0076] The material has a density of 2.7 g / cm3, a Young's modulus of 73 GPa, a tensile strength of 350 MPa, and a yield strength of 280 MPa. A uniform pressure of 2 MPa is applied to the inner surface of the three-dimensional model. Fixed surface constraints are added to the upper and lower ends of the conical model to completely constrain the upper and lower surfaces and prevent displacement.

[0077] Ⅲ. The stress values ​​and distribution of the model were calculated using finite element software.

[0078] IV. Based on the obtained values ​​and distribution cloud maps, record the areas where the stress value is less than 10 MPa.

[0079] V. The model was recreated using 3D modeling software. During the modeling process, solid parts in areas with stress values ​​<10 MPa were removed to form a 3D model of a conical part with a cavity.

[0080] Step 4, Performance Verification:

[0081] The performance verification includes strength, stiffness, and deformation.

[0082] The optimized conical model obtained in step 3 was imported into the finite element software. A uniform pressure of 2 MPa was applied to the inner surface of the three-dimensional model. Fixed constraints were applied to the upper and lower ends of the conical model. Simulation calculations were performed, and the maximum stress of the conical component was found to be 190 MPa. The yield strength of the material of the conical component was 280 MPa, and the safety factor was 1.47. It was determined that the optimized structure met the usage requirements.

[0083] Step 5, Raw material selection:

[0084] The large end of the tapered part is manufactured using forging machining process, with ring forgings as the raw material. Based on the mechanical performance requirements of the product, namely the tensile strength ≥350Mpa and the yield strength ≥280Mpa, the material grade selected is aluminum alloy 2219.

[0085] The small end of the tapered part is formed by 3D printing, using aluminum alloy powder as the raw material. According to the mechanical performance requirements of the product, namely the tensile strength of the material is ≥350Mpa and the yield strength is ≥280Mpa, the material must be weldable to aluminum alloy 2219 and be able to be 3D printed. The grade AlSi7Mg powder is selected here.

[0086] Step 6: Manufacturing the small end of the tapered component:

[0087] The small end of the tapered component is prepared using 3D printing technology.

[0088] The 3D model generated in step 2 is processed using Magics software. The 3D model is cut into equal-thickness slices along the height direction, with each slice having a thickness of 0.03 mm, to obtain the slice scanning data at the small end. This slice scanning data is then imported into the selected area laser melting device.

[0089] The process parameters for selective laser melting were determined as follows: laser power of 280W; scanning speed of 1200mm / s; scanning spacing of 0.08mm; and layer thickness of 0.03mm.

[0090] Scan the first layer:

[0091] The obtained alloyed powder is placed into the forming chamber of the selective laser melting device. A scraper is used to spread the powder, forming a first powder bed with a thickness of 0.03 mm. The laser melting device is then activated, and the molten powder bed is scanned according to the determined layer scanning data. The scanning path is a straight line.

[0092] Scan the second layer:

[0093] After completing the first layer scan, a scraper is used to spread powder onto the molten first layer of powder, forming a second powder bed; the powder bed thickness is 0.03 mm. The laser is then activated to scan the molten powder bed according to the layer scan data; the scanning path is a straight line.

[0094] Scan the third layer:

[0095] A third powder bed is formed by spreading powder onto the second powder bed using a scraper. The powder layer thickness is 0.03 mm. The laser is then activated, and the molten powder bed is scanned based on the obtained layer scanning data; the scanning path is a straight line.

[0096] The scanning process of laser melting the second layer of powder and then the third layer of powder is repeated until the set height is reached. This yields the preform at the small end.

[0097] Step 7, Aging Heat Treatment:

[0098] Under the support fixture, the small-end preform is subjected to aging heat treatment using conventional methods. The support fixture adopts existing technology.

[0099] The small-end preform is placed in a heat treatment furnace using a support fixture. The furnace is heated to 165±5℃ at a heating rate of 3℃ / min and held for 240±5min. After holding, the preform is cooled with the furnace. The heat-treated small-end preform is obtained.

[0100] Step 8, machining of the little end:

[0101] Using machining methods, excess material of the small end prefabricated component is removed according to the design dimensions, and an I-shaped welding bevel is machined at the welding area of ​​the dividing line. This yields the small end semi-finished product, ready for use.

[0102] Step 9, Machining the large end of the tapered part:

[0103] Using conventional machining methods, the forging is machined into the large end of a tapered part according to the design drawings.

[0104] An I-shaped bevel is machined at the welding area of ​​the large end for welding to the small end. This yields a semi-finished large end; ready for use.

[0105] Step 10, Clean the bevel:

[0106] The welding areas of both the small and large ends of the semi-finished product are cleaned, including grinding to remove oxide scale, pickling, cleaning, and thorough drying. The bevel is then cleaned to prepare for welding.

[0107] Step 11, Assembly and Welding:

[0108] The large and small ends of the conical component are assembled and welded using an electron beam under the constraint of a support fixture. After welding, an aging treatment is performed to remove residual stress, resulting in a semi-finished conical metal component.

[0109] The electron beam welding process parameters are as follows: accelerating voltage 60 kV, electron beam current 75 mA, focusing current 2205 mA, welding speed 800 m / s; aging treatment process parameters are 130 ± 5 °C, holding time 330 ± 30 min, and air cooling.

[0110] Step 12, finishing:

[0111] According to the design drawings, the semi-finished conical metal parts are precision machined to obtain aluminum alloy conical metal parts.

[0112] This completes the manufacturing of the aluminum alloy tapered metal part.

Claims

1. A method for manufacturing an aluminum alloy conical metal part, characterized in that, The specific process is as follows: Step 1, determine the process plan: The determined process plan is as follows: a segmented welding method is adopted, the small end of the tapered part is integrally printed using SLM laser powder coating, and the large end is machined by forging; the small end and the large end are then welded, heat-treated, and machined to finally form the product; Step 2, division of the tapered component area: The tapered component is divided into two sections: a small-end tapered section and a large-end tapered section; the ratio of the length of the small end to the length of the large end is 2:

3. Step 3, weight reduction design: The stress of the three-dimensional model structure of the small end of the tapered part is calculated by finite element simulation software. For areas with internal stress <10Mpa, the stress is reduced or removed in the three-dimensional model. Based on this, the three-dimensional model is reconstructed to form a three-dimensional model with a cavity structure to achieve weight reduction. The specific process of weight reduction design is as follows: Ⅰ. Model the tapered part in 3D modeling software according to the design drawings to obtain a 1:1 3D model of the tapered part; after the small end is 3D modeled, import it into the finite element simulation software; II. Assign material properties to the 3D model of the tapered component in the finite element software, including the material's density, Young's modulus, tensile strength, and yield strength; The material has a density of 2.7 g / cm3, a Young's modulus of 73 GPa, a tensile strength of 350 MPa, and a yield strength of 280 MPa. A pressure of 2 MPa is uniformly applied to the inner surface of the three-dimensional model. Fixed surface constraints are added to the upper and lower ends of the conical model to completely constrain the upper and lower surfaces and prevent displacement. III. Calculate the stress values ​​and distribution of the model using finite element software; IV. Based on the obtained stress values ​​and their distribution cloud maps, record the areas where the stress value is less than 10 MPa; V. The model was remade using 3D modeling software. During the modeling process, solid parts in areas with stress values ​​<10 MPa were removed to complete the weight reduction design of the tapered component. Step 4, Performance Verification: The performance verification includes yield strength and safety factor; The optimized tapered component model obtained in step 3 was imported into the finite element software. A pressure of 2 MPa was uniformly applied to the inner surface of the 3D model, and fixed constraints were applied to the upper and lower ends of the tapered component model. Simulation calculations were performed to obtain the maximum stress, yield strength, and safety factor of the tapered component, and it was determined that the optimized structure met the usage requirements. The maximum stress of the obtained conical component is 190 MPa, the yield strength of the material of the conical component is 280 MPa, and the safety factor is 1.

47. Step 5, Raw material selection: The large end of the tapered component is made of aluminum alloy 2219. The small end of the tapered component uses AlSi7Mg powder as raw material. Step 6: Manufacturing the small end of the tapered part: The 3D model generated in step 2 is processed using Magics software; the 3D model is cut into equal-thickness slices along the height direction, with each slice having a thickness of 0.03mm, to obtain the slice scanning data at the small end, and the slice scanning data is imported into the selected area laser melting device; The process parameters for selective laser melting were determined as follows: laser power of 280W; scanning speed of 1200mm / s; scanning spacing of 0.08mm; and layer thickness of 0.03mm. The small end of the tapered component is obtained through 3D printing. Step 7, Aging Heat Treatment: Under the support fixture, the small end preform is subjected to aging heat treatment to obtain the heat-treated small end preform; When performing aging heat treatment on the small end preform, the heat treatment furnace is heated to 165±5℃ at a heating rate of 3℃ / min and held for 240±5min; after the holding period, it is cooled with the furnace. Step 8, Machining the small end of the tapered part: The small end of the tapered component is obtained through machining; ready for use. Step 9, enlarge the end of the machine: The large-end semi-finished product is obtained through machining; ready for use. Step 10, Clean the bevel: The welding parts of the small-end semi-finished product and the welding parts of the large-end semi-finished product are cleaned to prepare for welding. Step 11, Assembly and Welding: The large end semi-finished product of the conical part and the small end semi-finished product of the conical part are assembled together and welded by electron beam under the constraint of the supporting tooling; thus obtaining the semi-finished product of the conical metal part. The parameters of the electron beam welding process are as follows: accelerating voltage is 60 kV, electron beam current is 75 mA, focusing current is 2205 mA, and welding speed is 800 m / s; the aging treatment process parameters are 130 ± 5 °C, holding time is 330 ± 30 min, and cooling method is air cooling. Step 12, finishing: According to the design drawings, the semi-finished conical metal part is precision machined to obtain an aluminum alloy conical metal part. This completes the manufacturing of the aluminum alloy tapered metal part.

2. The manufacturing method of the aluminum alloy tapered metal part as described in claim 1, characterized in that, The specific process for manufacturing the small end of the tapered component is as follows: Scan the first layer: The obtained alloyed powder is placed into the forming chamber of the selective laser melting device; a scraper is used to spread the powder to form the first powder bed; the powder thickness is 0.03 mm; the laser melting device is started, and the melting powder bed is scanned according to the determined layer scanning data; the scanning path is a straight line; Scan the second layer: After completing the first layer scan, a scraper is used to spread powder on the molten first layer of powder to form a second powder bed; the powder thickness is 0.03 mm; the laser is activated to scan the molten powder bed according to the layer scan data; the scanning path is a straight line; Scan the third layer: A third powder bed is formed by spreading powder on the second powder bed using a scraper; the powder thickness is 0.03 mm; the laser is activated, and the molten powder bed is scanned based on the obtained layer scanning data; the scanning path is a straight line. Repeat the scanning process of laser melting the second layer of powder to laser melting the third layer of powder until the set height is reached; complete the 3D printing manufacturing of the small end of the conical part.

Images