CN113441733A - Shape and property control method in additive manufacturing process of heat-preservation sulfur pump impeller - Google Patents
Shape and property control method in additive manufacturing process of heat-preservation sulfur pump impeller Download PDFInfo
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/80—Data acquisition or data processing
- B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/10—Pre-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the field of metal component additive manufacturing, in particular to a shape and property control method in a thermal insulation sulfur pump impeller additive manufacturing process. The method comprises the following specific steps: firstly, mixing metal powder for impeller additive manufacturing with heterogeneous nucleation refiner powder; secondly, slicing and scanning path area discretization planning are carried out on the digifax of the impeller component to be formed by using slicing software; thirdly, changing laser energy input into discontinuous input according to a planned scanning path; and fourthly, performing laser additive manufacturing. The regional discretization of the laser forming process and the grain refinement of the heterogeneous nucleation refiner are combined together, so that the temperature gradient in the impeller forming process can be reduced, the residual stress is reduced, the volume fraction of the mesoaxial crystals in the impeller can be improved, and the grain structure is refined. The method has strong applicability, can be used for additive manufacturing of the impeller, can also be used for repairing and remanufacturing of the impeller, and is easy to popularize.
Description
The technical field is as follows:
the invention relates to the field of metal component additive manufacturing, in particular to a shape and property control method in a thermal insulation sulfur pump impeller additive manufacturing process.
Background art:
the laser three-dimensional forming technology is an advanced manufacturing technology, and can realize the high-performance, quick, full-compact and near-net forming of metal parts with complex structures without grinding tools. The three-dimensional forming manufacturing method of the part utilizes high-energy-density laser as a heat source, and realizes the three-dimensional forming manufacturing of the part in a layer-by-layer overlapping mode. Compared with the traditional processing technology, the laser three-dimensional forming technology has the following characteristics: the solidification rate is fast, and the method belongs to unbalanced fast solidification; secondly, a tooling die is not needed, and the flexibility degree in the manufacturing process is high; the product has short development period and high processing speed; the prepared part has fine microstructure and excellent mechanical property and chemical property; the size and complexity of the part have small influence on the processing difficulty; and sixthly, the wide space for further reducing the processing cost is provided. At present, the laser additive manufacturing technology is widely applied to metal materials such as titanium alloy, high-temperature alloy and the like, and parts prepared by the laser additive manufacturing technology are also used in the aerospace field. However, in the additive manufacturing process, due to the extreme non-uniformity of heat input in space, large residual stress exists in the component, and the component is easy to deform and crack.
The solidification behavior involved in the laser additive manufacturing process is different from other preparation technologies, and belongs to the non-interface thermal resistance non-equilibrium rapid solidification of a laser metallurgy high-temperature melting pool on a solid metal substrate, the solidification structure is easy to inherit the crystal orientation of the substrate, a directional structure with certain crystal orientation is formed, and the microscopic structure is obviously refined. This fine, crystalline grain structure with a certain crystal orientation gives the component an anisotropy in microstructure and mechanical properties. For some metal components, such as: the thermal insulation sulfur pump impeller needs to ensure the isotropy of the mechanical property. How to make an additive manufacturing component have an isotropic grain structure and eliminate anisotropy in macroscopic performance is a problem to be solved urgently in the field of additive manufacturing at present.
The invention content is as follows:
the invention aims to provide a shape and property control method in the additive manufacturing process of a heat-preservation sulfur pump impeller, so as to reduce the temperature gradient in the laser forming process, weaken the residual stress in a component and refine the grain structure.
In order to realize the purpose of the invention, the technical scheme of the invention is as follows:
a method for controlling shape and performance in the additive manufacturing process of a heat-preservation sulfur pump impeller comprises the following specific steps: firstly, mixing metal powder for impeller additive manufacturing with heterogeneous nucleation refiner powder; secondly, slicing and scanning path area discretization planning are carried out on the digifax of the impeller component to be formed by using slicing software; thirdly, changing laser energy input into discontinuous input according to a planned scanning path; and fourthly, performing laser additive manufacturing.
In the first step, a heterogeneous nucleation refiner and metal powder for the additive manufacturing of the impeller are mixed by adopting a ball milling process, so that the heterogeneous nucleation refiner is adhered to the surface of the metal powder; the heterogeneous nucleation refiner is one or more than two of nanoscale, submicron and micron-sized powder of refractory metal simple substances, carbides or nitrides, the metal powder is nickel-based alloy, iron-based alloy or cobalt-based alloy powder, the particle size of the metal powder is 53-105 mu m, and the heterogeneous nucleation refiner is 1-10% of the mass of the metal powder.
In the second step, the scanning path of each layer is planned according to region discretization, namely, the part to be formed in each layer is divided into a plurality of independent regions; after the laser beam has scanned over an area, it is moved to another area at a distance from the area to be scanned.
The method for controlling the shape and the controllability in the additive manufacturing process of the heat-preservation sulfur pump impeller adopts the existing layering software to carry out layering processing on a formed component and plans a scanning path according to a region discretization method.
In the third step, when the laser beam scans a certain area, the energy of the laser beam is input discontinuously, namely when the laser beam moves to a certain position in a scanning path, the laser beam is opened to ensure that the laser beam acts on the position, and the position is a molten pool point or a molten pool short line; after the point or the short line is sufficiently melted and formed, the laser beam is closed; then the laser beam moves to the next molten pool position, the laser is connected with the two positions scanned in sequence according to the discretization plan, namely a certain distance exists between the two positions scanned in sequence in the current region; when the laser moves to another position, the laser beam is opened, and the point or line melts the position until the laser beam is closed and moves to a third position; this is repeated until the laser beam scans each location that melts the region.
In the fourth step, each area is formed according to a point-by-point melting mode, and the points are overlapped until the forming of the area is finished; then scanning the next area until the whole layer is formed; and finally, forming the next layer in the same manner, and stacking layer by layer to finish the preparation of the impeller.
The technical principle of the invention is as follows:
the invention mainly aims at the laser additive manufacturing of the heat-preservation sulfur pump impeller, and the direction of the temperature gradient in an additive manufacturing molten pool is easy to promote the dendrite of a cylinder in the molten pool to grow upwards and epitaxially along the crystal orientation of crystal grains in a lower substrate. If one or more than two powders of nanometer, submicron and micron scale of refractory metal simple substance, carbide or nitride contained in the metal are attached to the surface of the metal powder, the nanometer powder with higher melting point is easy to become heterogeneous nucleation refiner in a molten pool, so that the critical supercooling degree required by the nucleation growth of crystal grains in the melt is reduced, and the generation of fine isometric crystals is promoted. In addition, the refractory metal simple substance, carbide or nitride particles as heterogeneous nucleation refiner can also be used as a strengthening phase in the alloy to play a role in strengthening the alloy.
The area discretization in laser forming includes discretization division of a scanning area and discontinuous control of a laser melting pool in scanning of a certain area. Under the region discretization scanning strategy, the heat accumulation is relatively small, the temperature gradient between the molten pool and the formed part is small, and therefore the thermal stress is relatively small, and the deformation and the cracking in the component additive manufacturing process are favorably controlled.
The invention has the advantages and beneficial effects that:
1. the additive manufacturing is carried out by adopting the region discretization and the grain refinement of the heterogeneous nucleation refiner, so that the thermal stress in the component can be reduced, the thin-wall shape of the heat-preservation sulfur pump impeller is easy to control, and the mechanical property of the impeller material can be improved.
2. The invention has simple realization process and is beneficial to industrial production.
3. The additive manufacturing method is high in applicability, not only can be used for additive manufacturing of the heat-preservation sulfur pump impeller, but also can be used for remanufacturing of the heat-preservation sulfur pump impeller, and is easy to popularize.
In a word, the method combines the regional discretization in the laser forming process and the grain refinement of the heterogeneous nucleation refiner together, so that the temperature gradient in the impeller forming process can be reduced, the residual stress can be reduced, the volume fraction of the medium axial crystal in the impeller can be improved, and the grain structure can be refined.
Description of the drawings:
FIG. 1 is a schematic view of a heterogeneous nucleation refiner-containing metal powder for additive manufacturing; wherein 1 is metal powder; 2 is WC powder.
FIG. 2 is a gold phase diagram of metal powder particles coated with a refiner.
Fig. 3 is a schematic diagram of a laser forming process area discretization scanning path. In which fig. 3(a) shows discretization of the scanning area, and fig. 3(b) shows non-continuous energy input.
Fig. 4 is a macro topography of an additive manufactured sample.
Fig. 5(a) -5 (b) are additive manufacturing of metal microstructures without and with the addition of a refiner. In FIG. 5(a), no refiner is added, and in FIG. 5(b), a refiner is added.
The specific implementation mode is as follows:
in the specific implementation process, the shape and property control method in the additive manufacturing process of the heat-preservation sulfur pump impeller comprises the first step of mixing metal powder for additive manufacturing of the impeller with heterogeneous nucleation refiner powder; the second step is that slicing software is utilized to carry out slicing and scanning path area discretization planning on the digifax of the impeller component to be formed; thirdly, changing laser energy input into discontinuous input according to a planned scanning path; and fourthly, performing laser additive manufacturing.
Before additive manufacturing, a heterogeneous nucleation refiner (such as one or more of nanoscale, submicron-scale and micron-scale powder of refractory metal simple substance, carbide or nitride) and metal powder (such as iron-based or nickel-based alloy powder) for impeller additive manufacturing are mixed by a ball milling process, so that the heterogeneous nucleation refiner is adhered to the surface of the metal powder. The nanometer-scale powder of the refractory metal simple substance, carbide or nitride can be used as heterogeneous nucleation particles in the additive manufacturing process, promotes the melt in the laser melting pool to be solidified around the heterogeneous nucleation particles as nucleation particles to form new crystal grains, and also can interrupt the continuous growth of the crystal grains which are epitaxially grown from the bottom in the original melting pool. Therefore, the growth of a columnar structure having a certain orientation can be suppressed, and the growth of multiple crystal grain nuclei can be promoted.
And before the additive manufacturing, slicing processing and path planning are carried out on the impeller digifax by using slicing software. When planning the path, ensuring that the scanning path of each layer is planned according to the region discretization, namely dividing the part to be formed in each layer into a plurality of independent regions; after the laser beam has scanned over an area, it is moved to another area at a distance from the area to be scanned. In this way, a continuous heat input in a certain area during the additive manufacturing process can be avoided, and the heat accumulation in the area is reduced, thereby reducing the temperature gradient and the internal stress in the component.
When the laser beam scans a certain area, the energy of the laser beam is input discontinuously, namely when the laser beam moves to a certain position in a scanning path, the laser beam is opened to ensure that the laser beam acts on the position, and the position can be a molten pool point or a molten pool short line; after the spot or short line is sufficiently melted and formed, the laser beam is turned off. Then the laser beam moves to the next position of the molten pool, and the two positions of the laser beam scanned in sequence are also planned according to discretization, namely, a certain distance exists between the two positions scanned in sequence in the current area. When the laser moves to another position, the laser beam is opened, and the point or line melts the position until the laser beam is closed and moves to a third position; this is repeated until the laser beam scans each location that melts the region.
And performing layering processing on the formed component by adopting the existing layering software, and planning a scanning path according to a region discretization method. When each region is formed, the laser energy is input discontinuously, namely a discretized 'point-by-point/short line melting' mode is adopted, and the 'point'/'short line' are overlapped until the region is formed; then scanning the next area until the whole layer is formed; and finally, forming the next layer in the same manner, and stacking layer by layer to finish the preparation of the impeller.
The invention is described in further detail below with reference to the figures and examples:
example 1:
in this embodiment, the GH4068 high-temperature alloy sample is prepared by a laser additive manufacturing method of area discretization and heterogeneous nucleation refiner grain refinement, and the process flow is as follows:
(1) preparation of metal powder and substrate for additive manufacturing: the base plate is made of a cast and forged GH3536 alloy plate, and when the surface of the base plate to be clad is subjected to cleaning treatment, decay tissues such as an oxide layer and the like near the defect can be thoroughly removed by a mechanical method, so that the inner metal surface is exposed. Preparing GH4068 alloy powder by adopting an inert gas atomization technology, and screening out alloy powder with the particle size of 53-105 microns for later use; selecting nano-scale WC powder and mixing according to 3% of the mass fraction of the GH4068 alloy powder.
As shown in fig. 1 and 2, metal powder 1(GH4068 alloy powder) is mixed with micron-sized WC powder 2 by a ball milling method. The nanometer WC powder 2 is used as a refiner and is adhered to the surface of the metal powder 1.
(2) Determination of basic process parameters of alloy laser additive manufacturing: and slicing and scanning path planning are carried out on UG or CAD (computer aided design) digital models of the three-dimensional shape of the sample to be formed by utilizing slicing software such as Magics and the like. As shown in fig. 3(a) -3 (b), when planning a scan path, it is necessary to perform area discretization management, that is, to divide the portion to be formed in each layer into a plurality of independent areas; after the laser is scanned over an area, it is moved to another area at a distance from the area to be scanned. And circulating the steps until the repair of the component is completed. When the laser beam scans a certain area and moves to a certain position in a scanning path, the laser beam is opened to scan a certain point or short line, after the point or short line is fully formed, the laser beam is closed, then the laser beam moves to a position which has a certain distance with the current scanning path, and the laser beam is opened, melted and scanned until the laser beam is closed and moves to a third position; this is repeated until the laser beam scans each location that melts the region.
As shown in fig. 3(a), the scanning area is uniformly divided into 1 to 8 rectangular areas each having an area of 4mm × 4 mm. The discretization management mode of the scanning area is as follows: the laser beam scanning is performed in the order of 1, 2, 3, 4, 5, 6, 7, 8, with a distance between adjacent scanned areas of said order. For example: after the laser scans the area 1, the laser beam is turned off and then moves to the area 2 which is separated from the area 1 by two areas for scanning. After the laser scans the area 2, the laser beam is turned off and moved to the area 3 spaced from the area 2 by one area for scanning. After the laser has scanned over region 3, the laser beam is turned off and moved to region 4, which is three regions apart from region 3, for scanning. After the laser has scanned across area 4, the laser beam is turned off and moved to area 5, which is spaced from area 4 by an area, for scanning. After the laser has scanned across area 5, the laser beam is turned off and moved to area 6, which is two areas apart from area 5, for scanning. After the laser has scanned across area 6, the laser beam is turned off and moved to area 7, which is spaced from area 6 by an area, for scanning. After the laser has scanned across area 7, the laser beam is turned off and moved to area 8, which is spaced from area 7 by an area, for scanning.
As shown in fig. 3(b), each region is uniformly divided into 1 to 9 rectangular positions each having an area of 1.33mm × 1.33 mm. When the laser beam scans a certain area, the discontinuous energy input mode of the area is as follows: the point-by-point melting is performed in the order of 1, 2, 3, 4, 5, 6, 7, 8, 9. And there is a distance between adjacent positions of said sequence. For example: after the laser melts location 1, the laser beam is turned off and moved to location 2, which is spaced from location 1 by a distance, for melting. After the laser melts location 2, the laser beam is turned off and moved to location 3, which is four locations away from location 2, for melting. After the laser melts location 3, the laser beam is turned off and moved to location 4, which is spaced from location 3 by a distance, for melting. After the laser melts location 4, the laser beam is turned off and moved to location 5, which is spaced from location 4 by a distance, for melting. After the laser melts location 5, the laser beam is turned off and moved to a location 6 spaced two locations from location 5 for melting. After the laser melts location 6, the laser beam is turned off and moved to location 7, which is spaced from location 6 by a distance, for melting. After the laser melts location 7, the laser beam is turned off and moved to a location 8 spaced from location 7 for melting. After the laser melts location 8, the laser beam is turned off and moved to location 9, which is spaced from location 8 by a distance, to melt.
(3) Preparation of a sample:
in order to obtain the optimized basic process parameters for manufacturing the GH4068 alloy, an orthogonal experiment method is adopted to obtain the influence rule of various process parameters including laser power, laser working time, laser closing time, powder feeding amount, distance between a point and a point, layer thickness and the like on the microstructure and metallurgical defects of a forming layer, and further determine the specific process parameters for forming the GH4068 alloy.
In the embodiment, the diameter of the laser beam is 0.8-2.0 mm, the laser power is 500-1200 w, the laser working time is 0.1-0.3 s, the laser closing time is 0.1-0.6 s, the powder feeding amount is 10-20 g/min, the distance between a point and a point is 0.5-1.5 mm, and the layer thickness is 0.2-1.0 mm.
And (3) performing additive manufacturing on the sample by using the optimized process parameters to obtain the high-strength high-toughness heat-preservation sulfur pump impeller. As shown in fig. 4, the macro topography of the obtained sample shows that the member is not deformed or cracked. As shown in fig. 5(a) -5 (b), the microstructure of the metal sample manufactured by additive manufacturing without adding the refiner and adding the refiner can be seen, and the addition of the refiner can interrupt the growth of the columnar crystal in the alloy and convert the columnar crystal into the isometric crystal.
The embodiment result shows that the method utilizes the traditional additive manufacturing laser light source to carry out region discretization and heterogeneous nucleation refiner grain refinement in the forming process. Under the action of the discontinuous energy input and the grain refiner, the uniformity of a temperature field of a laser molten pool can be ensured, the thermal stress in the additive manufacturing process of the component is reduced, and a fine grain structure is easy to form in the molten pool.
Claims (6)
1. A method for controlling shape and performance in the additive manufacturing process of a heat-preservation sulfur pump impeller is characterized by comprising the following specific steps: firstly, mixing metal powder for impeller additive manufacturing with heterogeneous nucleation refiner powder; secondly, slicing and scanning path area discretization planning are carried out on the digifax of the impeller component to be formed by using slicing software; thirdly, changing laser energy input into discontinuous input according to a planned scanning path; and fourthly, performing laser additive manufacturing.
2. The shape and control method in the additive manufacturing process of the heat-preservation sulfur pump impeller according to claim 1, characterized in that in the first step, the heterogeneous nucleation refiner and the metal powder for the additive manufacturing of the impeller are mixed by adopting a ball milling process, so that the heterogeneous nucleation refiner is adhered to the surface of the metal powder; the heterogeneous nucleation refiner is one or more than two of nanoscale, submicron and micron-sized powder of refractory metal simple substances, carbides or nitrides, the metal powder is nickel-based alloy, iron-based alloy or cobalt-based alloy powder, the particle size of the metal powder is 53-105 mu m, and the heterogeneous nucleation refiner is 1-10% of the mass of the metal powder.
3. The method for controlling the shape and the controllability in the additive manufacturing process of the heat-preservation sulfur pump impeller according to claim 1, wherein in the second step, the scanning path of each layer is planned according to the region discretization, namely, the part to be formed in each layer is divided into a plurality of independent regions; after the laser beam has scanned over an area, it is moved to another area at a distance from the area to be scanned.
4. The method for controlling the shape and the controllability in the additive manufacturing process of the heat-preservation sulfur pump impeller according to claim 3, wherein the formed component is subjected to layering treatment by using existing layering software, and a scanning path is planned according to a region discretization method.
5. The method for controlling the shape and the controllability in the additive manufacturing process of the heat-preservation sulfur pump impeller according to claim 1, wherein in the third step, when the laser beam scans a certain area, the energy of the laser beam is input discontinuously, that is, when the laser beam moves to a certain position in a scanning path, the laser beam is opened to ensure that the laser beam acts on the position, and the position is a molten pool point or a molten pool short line; after the point or the short line is sufficiently melted and formed, the laser beam is closed; then the laser beam moves to the next molten pool position, the laser is connected with the two positions scanned in sequence according to the discretization plan, namely a certain distance exists between the two positions scanned in sequence in the current region; when the laser moves to another position, the laser beam is opened, and the point or line melts the position until the laser beam is closed and moves to a third position; this is repeated until the laser beam scans each location that melts the region.
6. The method for controlling the shape and the controllability in the additive manufacturing process of the heat-preservation sulfur pump impeller according to claim 1, wherein in the fourth step, each region is formed in a point-by-point melting mode, and the points are overlapped until the region is formed; then scanning the next area until the whole layer is formed; and finally, forming the next layer in the same manner, and stacking layer by layer to finish the preparation of the impeller.
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| WO2023059855A1 (en) * | 2021-10-07 | 2023-04-13 | The Regents Of The University Of Michigan | Intelligent scan sequence optimization for powder bed fusion additive manufacturing using linear systems theory |
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| CN112974845A (en) * | 2021-02-09 | 2021-06-18 | 江苏飞跃机泵集团有限公司 | Discontinuous laser additive manufacturing method for metal component |
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