CN111974999A - Shape control method for 3D printing of thin-wall pipeline part - Google Patents
Shape control method for 3D printing of thin-wall pipeline part Download PDFInfo
- Publication number
- CN111974999A CN111974999A CN202010813353.9A CN202010813353A CN111974999A CN 111974999 A CN111974999 A CN 111974999A CN 202010813353 A CN202010813353 A CN 202010813353A CN 111974999 A CN111974999 A CN 111974999A
- Authority
- CN
- China
- Prior art keywords
- wall
- thin
- printing
- pipeline part
- lattice structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- 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
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- 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
-
- 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
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
-
- 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
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/247—Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention relates to a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps: designing a dot matrix structure on the outer wall of the 3D printed thin-wall pipeline part; the extension width of the lattice structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; carrying out layered slicing on the 3D printing structure after the lattice structure is designed, and importing layered slicing results into a 3D printing program; 3D printing is carried out, and heat treatment is carried out on the 3D printed part; and removing the lattice structure to finish the shape control of the 3D printing pipeline part. According to the invention, the lattice structure is arranged on the outer surface of the 3D printed thin-wall pipeline part, so that the plane shrinkage force of the metal in different height layers after melting and solidification can be supplemented, and thus the shrinkage of the current layer is controlled, and the requirement on the integral shape control of the part is met; the shape control method is simple and efficient, and can remarkably improve the efficiency of 3D printing of thin-wall pipeline parts.
Description
Technical Field
The invention belongs to the technical field of 3D printing, relates to a shape control method for 3D printing, and particularly relates to a shape control method for 3D printing of thin-wall pipeline parts.
Background
In the research and development process of large-scale complex high-temperature metal components, investment precision casting or sand casting is mostly carried out by adopting a die opening method, a production process has a lot of difficulties, the investment precision casting shell making process is very difficult, failure is often caused by the strength and cracks of a membrane shell, and the surface and the size of sand casting hardly meet the requirements.
3D printing is a technique for building objects by layer-by-layer printing using viscous materials, such as powdered metal and/or plastic, based on digital model files. The 3D printing manufacturing technology has the characteristics of short processing period and rapid forming, and has obvious advantages in the aspect of manufacturing thin-walled parts with complex structures.
However, in the process of 3D printing of the thin-walled workpiece, the defect of large deformation at different temperatures often occurs, so that the reliability and the product quality of the thin-walled workpiece are affected.
The deformation of the thin-wall part is controlled in a machining mode, so that the later processing time is greatly prolonged, and the processing progress of the thin-wall pipeline part is influenced; meanwhile, the operation error caused by machining causes great inconsistency among parts of different batches.
Therefore, a simple and effective shape control method is needed to be provided, so that the deformation quantity of the 3D printed thin-wall pipeline part is small, and the requirement of the part required by aerospace is met.
Disclosure of Invention
The invention aims to provide a shape control method for 3D printing of a thin-wall pipeline part, and particularly relates to a shape control method for 3D printing of a titanium alloy thin-wall pipeline part, which can improve the efficiency of 3D printing of the thin-wall pipeline part and can remarkably improve the conditions of outer wall depression and deformation of the 3D printing thin-wall pipeline part.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure on the outer wall of the 3D printed thin-wall pipeline part; the extension width of the lattice structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure is designed, and importing layered slicing results into a 3D printing program;
(3) 3D printing is carried out, and heat treatment is carried out on the 3D printed part;
(4) and removing the lattice structure to finish the shape control of the 3D printing pipeline part.
The dot matrix structure is arranged in the step (1) of the invention, and the dot matrix structure is arranged on the outer wall of the thin-wall pipeline part needing 3D printing by using conventional 3D printing software in the field. When the 3D prints the thin-wall pipeline part, the outer wall of the thin-wall pipeline part can be pulled by the beam structure in the thin-wall pipeline part during molding, so that the thin-wall pipeline part is sunken and deformed. According to the invention, by designing the dot matrix mechanism, the dot matrix structure and the thin-wall pipeline part are integrally formed, and the extension width of the dot matrix structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part, so that the outer wall of the thin-wall pipeline part is effectively prevented from being sunken and deformed during 3D printing.
The 'extension width' refers to that a cross section is made on the thin-wall pipeline part with the lattice structure, the outermost side of the lattice structure is taken as a starting point, a straight line is made in the direction perpendicular to the central line of the thin-wall pipeline part, the intersection point of the straight line and the outer wall is taken as an end point, and the distance between the starting point and the end point is the 'extension width' of the invention. The term "1/2 for the width of the inner wall" means that the distance between the starting point and the ending point is "1/2" for the width of the inner wall "where the starting point is the intersection of the straight line and the inner wall surface of the outer wall and the intersection of the straight line and the center line of the thin-walled pipe fitting is the ending point.
The layered slicing in step (2) of the present invention is to layer the 3D printed structure model in the height direction, and the thickness of each layer is 20 to 60 μm, for example, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm or 60 μm, but is not limited to the values listed, and other values not listed in the numerical range are also applicable; each slice generated by the hierarchical slices is parallel to a slice reference plane; the 3D printing program is a conventional 3D printing program in the field and can be used for printing the thin-wall pipeline parts and the dot matrix structure which involves the outer wall of the thin-wall pipeline parts according to the layered slice model.
Preferably, the lattice structure is a rhombohedral structure or a cubic structure.
Preferably, the ribs of the lattice structure have a diameter of 0.5 to 3mm, for example 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but are not limited to the values listed, and other values not listed in the numerical range are equally suitable.
The width of the inner wall of a conventional thin-wall pipeline part in the field is 0.5-3mm, the lattice structure provided by the invention has the advantages that the diameter of the edge of the lattice structure is 0.5-3mm, and the ratio of the diameter to the width of the inner wall is (0.2-1):1, so that the lattice structure provided by the invention can effectively overcome the problems of depression and deformation of the thin-wall pipeline part caused by the influence of the inner wall beam structure in the 3D printing and forming process.
Preferably, the lattice structure has a length of 3 to 8mm, for example 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, but is not limited to the values listed, and other values not listed within the range of values are equally applicable.
Preferably, the heat treatment of step (3) is performed under vacuum.
Preferably, the temperature of the heat treatment in step (3) is 800-1000 ℃, and may be, for example, 800 ℃, 850 ℃, 900 ℃, 950 ℃ or 1000 ℃, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the heating rate of the heat treatment in step (3) is 3-10 deg.C/min, such as 3 deg.C/min, 4 deg.C/min, 5 deg.C/min, 6 deg.C/min, 7 deg.C/min, 8 deg.C/min, 9 deg.C/min or 10 deg.C/min, but not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the heat treatment in step (3) is carried out for a holding time of 2-6h, for example 2h, 3h, 4h, 5h or 6h, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the shape control method further comprises the step of performing surface treatment on the 3D printed thin-wall pipeline part after the step (4).
Preferably, the surface treatment comprises surface blasting and/or surface shot blasting.
Preferably, the blasting treatment is: the sand blasting medium is 40-80 mesh silicon carbide, the pressure is 0.3-0.5MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the workpiece is 150-300 mm.
The average particle size of the silicon carbide used for the sand blasting according to the present invention is 40 to 80 mesh, and may be, for example, 40 mesh, 45 mesh, 50 mesh, 55 mesh, 60 mesh, 65 mesh, 70 mesh, 75 mesh or 80 mesh, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
The blasting pressure of the blasting treatment is 0.3 to 0.5MPa, and may be, for example, 0.3MPa, 0.35MPa, 0.4MPa, 0.45MPa or 0.5MPa, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
The distance between the nozzle and the surface of the workpiece is 150-300mm, such as 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm or 300mm, but not limited to the values listed, and other values not listed in the range of values are also applicable.
Preferably, the shot peening is: the shot blasting medium adopts steel balls with the diameter of 0.1-0.5mm, the shot blasting pressure is 0.2-0.4MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 180-300 mm.
The steel balls used for the shot blasting according to the invention have a diameter of 0.1 to 0.5mm, for example 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm, but are not limited to the values listed, and other values not listed in the numerical ranges are equally suitable.
The shot-peening pressure is 0.2 to 0.4MPa, and may be, for example, 0.2MPa, 0.25MPa, 0.3MPa, 0.35MPa or 0.4MPa, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
The distance between the nozzle and the surface of the workpiece is 180-300mm, such as 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm or 300mm, but not limited to the values listed, and other values not listed in the range of values are also applicable.
The shot blasting treatment and the sand blasting treatment can effectively improve the surface quality of the thin-wall pipeline part. The obtained thin-wall pipeline part meets the requirements of aerospace parts.
As a preferable technical solution of the shape control method of the present invention, the shape control method includes the steps of:
(1) designing a dot matrix structure on the outer wall of the 3D printed thin-wall pipeline part; the extension width of the lattice structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure is a rhombic dodecahedron structure or a cubic structure; the diameter of the edge of the lattice structure is 0.5-3mm, and the length of the edge is 3-8 mm;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure is designed, and importing layered slicing results into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 800-1000 ℃ at the heating rate of 3-10 ℃/min, and then preserving heat for 2-6 h;
(4) removing the lattice structure to finish the shape control of the 3D printing pipeline part;
(5) sequentially carrying out shot blasting and sand blasting on the 3D printing pipeline part obtained in the step (4);
the sand blasting treatment in the step (5) comprises the following steps: the sand blasting medium is 40-80 meshes of silicon carbide, the pressure is 0.3-0.5MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 150-300 mm;
the shot blasting treatment in the step (5) comprises the following steps: the shot blasting medium adopts steel balls with the diameter of 0.1-0.5mm, the shot blasting pressure is 0.2-0.4MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 180-300 mm.
Compared with the prior art, the invention has the following beneficial effects:
when the 3D prints the thin-wall pipeline part, the outer wall of the thin-wall pipeline part can be pulled by the beam structure in the thin-wall pipeline part during molding, so that the thin-wall pipeline part is sunken and deformed. According to the invention, by designing the dot matrix mechanism, the dot matrix structure and the thin-wall pipeline part are integrally formed, and the extension width of the dot matrix structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part, so that the outer wall of the thin-wall pipeline part is effectively prevented from being sunken and deformed during 3D printing.
Drawings
FIG. 1 is a schematic structural diagram of a thin-wall pipeline part with a lattice structure obtained by a 3D printing shape control method of the thin-wall pipeline part provided by the invention;
fig. 2 is a sectional view a-a of the schematic structural diagram of the thin-walled pipe part having a lattice structure provided by the present invention, wherein H is 1/2 of the width of the inner wall, and H is the extension width.
Wherein: 1, an outer wall; 2, a beam structure; and 3, lattice structure.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a rhombic dodecahedron structure; the diameter of the edge of the lattice structure 3 is 1.8mm, the length of the edge is 5mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 20 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 900 deg.C at a heating rate of 6 deg.C/min, and maintaining for 4h to obtain thin-wall pipe part with lattice structure 3 shown in FIG. 1, with A-A cross-sectional view shown in FIG. 2;
(4) and removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part.
Example 2
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a cubic structure; the diameter of the edge of the lattice structure 3 is 1mm, the length of the edge is 4mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 30 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 850 ℃ at the heating rate of 4 ℃/min, and then preserving heat for 5h to obtain the thin-wall pipeline part with the lattice structure 3 shown in the figure 1;
(4) and removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part.
Example 3
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a cubic structure; the diameter of the edge of the lattice structure 3 is 2.4mm, the length of the edge is 6mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 40 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 950 ℃ at a heating rate of 8 ℃/min, and then preserving heat for 3h to obtain the thin-wall pipeline part with the lattice structure 3 shown in figure 1;
(4) and removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part.
Example 4
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a rhombic dodecahedron structure; the diameter of the edge of the lattice structure 3 is 0.5mm, the length of the edge is 3mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 50 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 800 ℃ at a heating rate of 3 ℃/min, and then preserving heat for 6h to obtain the thin-wall pipeline part with the lattice structure 3 shown in the figure 1;
(4) and removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part.
Example 5
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a cubic structure; the diameter of the edge of the lattice structure 3 is 3mm, the length of the edge is 8mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 60 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 1000 ℃ at a heating rate of 10 ℃/min, and then preserving heat for 2h to obtain the thin-wall pipeline part with the lattice structure 3 shown in figure 1;
(4) and removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part.
Example 6
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a rhombic dodecahedron structure; the diameter of the edge of the lattice structure 3 is 1.8mm, the length of the edge is 5mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 20 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 900 ℃ at the heating rate of 6 ℃/min, and then preserving heat for 4h to obtain the thin-wall pipeline part with the lattice structure 3 shown in the figure 1;
(4) removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part;
(5) sequentially carrying out shot blasting and sand blasting on the 3D printing pipeline part obtained in the step (4);
the sand blasting treatment in the step (5) comprises the following steps: the sand blasting medium is 60-mesh silicon carbide, the pressure is 0.4MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 210 mm;
the shot blasting treatment in the step (5) comprises the following steps: the shot blasting medium adopts steel balls with the diameter of 0.3mm, the shot blasting pressure is 0.3MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 210 mm.
In addition, in the embodiment, through the sand blasting and the shot blasting which are sequentially performed, the surface quality of the obtained thin-wall pipeline part can be uniform, and the obtained thin-wall pipeline part meets the requirements of aerospace parts.
Example 7
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a rhombic dodecahedron structure; the diameter of the edge of the lattice structure 3 is 1.8mm, the length of the edge is 5mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 20 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 900 ℃ at the heating rate of 6 ℃/min, and then preserving heat for 4h to obtain the thin-wall pipeline part with the lattice structure 3 shown in the figure 1;
(4) removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part;
(5) sequentially carrying out shot blasting and sand blasting on the 3D printing pipeline part obtained in the step (4);
the sand blasting treatment in the step (5) comprises the following steps: the sand blasting medium is 40-mesh silicon carbide, the pressure is 0.5MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 300 mm;
the shot blasting treatment in the step (5) comprises the following steps: the shot blasting medium adopts steel balls with the diameter of 0.5mm, the shot blasting pressure is 0.4MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 300 mm.
In addition, in the embodiment, through the sand blasting and the shot blasting which are sequentially performed, the surface quality of the obtained thin-wall pipeline part can be uniform, and the obtained thin-wall pipeline part meets the requirements of aerospace parts.
Example 8
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which comprises the following steps:
(1) designing a dot matrix structure 3 on the outer wall 1 of the 3D printed thin-wall pipeline part; the extension width of the lattice structure 3 is 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure 3 is a rhombic dodecahedron structure; the diameter of the edge of the lattice structure 3 is 1.8mm, the length of the edge is 5mm, and the ratio of the diameter to the width of the inner wall is within the range of (0.2-1): 1;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure 3 is designed, wherein the thickness of each layer is 20 micrometers so as to improve the 3D printing precision, and then importing the layered slicing result into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 900 ℃ at the heating rate of 6 ℃/min, and then preserving heat for 4h to obtain the thin-wall pipeline part with the lattice structure 3 shown in the figure 1;
(4) removing the lattice structure 3 to finish the shape control of the 3D printing pipeline part;
(5) sequentially carrying out shot blasting and sand blasting on the 3D printing pipeline part obtained in the step (4);
the sand blasting treatment in the step (5) comprises the following steps: the sand blasting medium is 80-mesh silicon carbide, the pressure is 0.3MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 150 mm;
the shot blasting treatment in the step (5) comprises the following steps: the shot blasting medium adopts steel balls with the diameter of 0.1mm, the shot blasting pressure is 0.2MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 180 mm.
In addition, in the embodiment, through the sand blasting and the shot blasting which are sequentially performed, the surface quality of the obtained thin-wall pipeline part can be uniform, and the obtained thin-wall pipeline part meets the requirements of aerospace parts.
Example 9
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which is the same as the embodiment 6 except that the pressure of shot blasting is 0.5 MPa.
Due to the fact that the pressure of shot blasting treatment is too high, the thin-wall pipeline part subjected to surface treatment is obviously deformed.
Example 10
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which is the same as that in embodiment 6 except that the pressure of sand blasting is 0.6 MPa.
Due to the fact that the pressure of sand blasting is too high, the thin-wall pipeline part subjected to surface treatment is obviously deformed.
Example 11
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which is the same as the embodiment 6 except that the distance between a spray head and a workpiece is 160mm during shot blasting.
Due to the too close distance from the workpiece, the surface-treated thin-walled pipe part is significantly deformed.
Example 12
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, and the shape control method is the same as that in embodiment 6 except that the distance between a spray head and a workpiece is 140mm during sand blasting.
Due to the too close distance from the workpiece, the surface-treated thin-walled pipe part is significantly deformed.
Example 13
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, which is the same as the embodiment 6 except that the pressure of shot blasting is 0.15MPa, and the pressure of sand blasting is 0.25 MPa.
The pressure of the shot blasting treatment and the sand blasting treatment is too low, so that the surface quality of the thin-wall pipeline part subjected to the surface treatment is not uniform.
Example 14
The embodiment provides a shape control method for 3D printing of a thin-wall pipeline part, and the shape control method is the same as that in embodiment 6 except that the distance between a spray head and a workpiece is 320mm during shot blasting and 320mm during sand blasting.
The surface quality of the thin-walled pipe components subjected to surface treatment is not uniform due to the excessive distance from the workpiece.
Comparative example 1
The comparative example provides a shape control method for 3D printing of a thin-wall pipeline part, and the method is the same as that of the embodiment 1 except that in the step (1), the extension width of the lattice structure 3 is 1/3 of the width of the inner wall of the corresponding position of the 3D printing thin-wall pipeline part.
Because the epitaxial width of the lattice structure 3 is narrow, the lattice structure 3 cannot effectively overcome the dragging of the beam structure 2 in the thin-wall pipeline part to the outer wall 1 of the pipeline part during the forming, and the outer wall 1 of the thin-wall pipeline part has the concave and obvious deformation.
To sum up, when the 3D prints the thin-walled pipeline part, the outer wall 1 of the thin-walled pipeline part can be pulled by the beam structure 2 in the thin-walled pipeline part during the forming process, so that the sinking and the deformation of the thin-walled pipeline part are caused. According to the invention, by designing the dot matrix mechanism, the dot matrix structure 3 and the thin-wall pipeline part are integrally formed, and the extension width of the dot matrix structure 3 is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part, so that the outer wall 1 of the thin-wall pipeline part is effectively prevented from being sunken and deformed during 3D printing.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A shape control method for 3D printing of a thin-wall pipeline part is characterized by comprising the following steps:
(1) designing a dot matrix structure on the outer wall of the 3D printed thin-wall pipeline part; the extension width of the lattice structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure is designed, and importing layered slicing results into a 3D printing program;
(3) 3D printing is carried out, and heat treatment is carried out on the 3D printed part;
(4) and removing the lattice structure to finish the shape control of the 3D printing pipeline part.
2. The shape control method according to claim 1, wherein the lattice structure is a rhombohedral structure or a cubic structure.
3. The method of claim 2, wherein the ribs of the lattice structure have a diameter of 0.5-3 mm.
4. A method as claimed in claim 2 or 3, wherein the lattice structure has a ridge length of 3-8 mm.
5. The shape control method according to claim 1, wherein the heat treatment of step (3) is performed under vacuum.
6. The shape control method as claimed in claim 5, wherein the temperature of the heat treatment in step (3) is 800-1000 ℃;
preferably, the heating rate of the heat treatment in the step (3) is 3-10 ℃/min;
preferably, the heat treatment of the step (3) has the holding time of 2-6 h.
7. The shape control method according to claim 1, characterized by further comprising the step of surface treating the 3D printed thin-walled pipe part after step (4).
8. The shape control method according to claim 7, wherein the surface treatment comprises surface blasting and/or surface shot blasting.
9. The shape control method according to claim 8, wherein the sand blasting is: the sand blasting medium is 40-80 meshes of silicon carbide, the pressure is 0.3-0.5MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 150-300 mm;
preferably, the shot peening is: the shot blasting medium adopts steel balls with the diameter of 0.1-0.5mm, the shot blasting pressure is 0.2-0.4MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 180-300 mm.
10. The shape control method according to any one of claims 1 to 9, characterized by comprising the steps of:
(1) designing a dot matrix structure on the outer wall of the 3D printed thin-wall pipeline part; the extension width of the lattice structure is not less than 1/2 of the width of the inner wall of the corresponding position of the 3D printed thin-wall pipeline part; the lattice structure is a rhombic dodecahedron structure or a cubic structure; the diameter of the edge of the lattice structure is 0.5-3mm, and the length of the edge is 3-8 mm;
(2) carrying out layered slicing on the 3D printing structure after the lattice structure is designed, and importing layered slicing results into a 3D printing program;
(3) 3D printing is carried out, and the 3D printed part is subjected to heat treatment under the vacuum condition; the heat treatment comprises the following steps: heating to 800-1000 ℃ at the heating rate of 3-10 ℃/min, and then preserving heat for 2-6 h;
(4) removing the lattice structure to finish the shape control of the 3D printing pipeline part;
(5) sequentially carrying out shot blasting and sand blasting on the 3D printing pipeline part obtained in the step (4);
the sand blasting treatment in the step (5) comprises the following steps: the sand blasting medium is 40-80 meshes of silicon carbide, the pressure is 0.3-0.5MPa, the sand blasting angle is 90 degrees +/-20 degrees, and the distance from the sand blasting medium to the workpiece is 150-300 mm;
the shot blasting treatment in the step (5) comprises the following steps: the shot blasting medium adopts steel balls with the diameter of 0.1-0.5mm, the shot blasting pressure is 0.2-0.4MPa, the shot blasting angle is 90 degrees +/-20 degrees, and the distance from the shot blasting medium to a workpiece is 180-300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813353.9A CN111974999B (en) | 2020-08-13 | 2020-08-13 | Shape control method for 3D printing of thin-wall pipeline part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813353.9A CN111974999B (en) | 2020-08-13 | 2020-08-13 | Shape control method for 3D printing of thin-wall pipeline part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111974999A true CN111974999A (en) | 2020-11-24 |
| CN111974999B CN111974999B (en) | 2021-10-15 |
Family
ID=73434306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010813353.9A Active CN111974999B (en) | 2020-08-13 | 2020-08-13 | Shape control method for 3D printing of thin-wall pipeline part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111974999B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112548106A (en) * | 2021-02-26 | 2021-03-26 | 中国航发上海商用航空发动机制造有限责任公司 | Method for repairing ultrathin structure by additive manufacturing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837194A1 (en) * | 1996-10-17 | 1998-04-22 | Lösch GmbH Betonwerke | Wall element |
| CN106425286A (en) * | 2015-11-24 | 2017-02-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Machining method for deformation control of high-precision thin-wall cylinder shaft |
| CN108145161A (en) * | 2017-12-04 | 2018-06-12 | 首都航天机械公司 | A kind of auxiliary support structure for inhibiting thin-wall construction deformation |
| CN108629086A (en) * | 2018-04-12 | 2018-10-09 | 华中科技大学 | A kind of Stress relief method suitable for increasing material manufacturing part |
| CN111266574A (en) * | 2019-12-11 | 2020-06-12 | 西安航天发动机有限公司 | Integral manufacturing method of pin type head interlayer shell of aerospace engine |
-
2020
- 2020-08-13 CN CN202010813353.9A patent/CN111974999B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837194A1 (en) * | 1996-10-17 | 1998-04-22 | Lösch GmbH Betonwerke | Wall element |
| CN106425286A (en) * | 2015-11-24 | 2017-02-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Machining method for deformation control of high-precision thin-wall cylinder shaft |
| CN108145161A (en) * | 2017-12-04 | 2018-06-12 | 首都航天机械公司 | A kind of auxiliary support structure for inhibiting thin-wall construction deformation |
| CN108629086A (en) * | 2018-04-12 | 2018-10-09 | 华中科技大学 | A kind of Stress relief method suitable for increasing material manufacturing part |
| CN111266574A (en) * | 2019-12-11 | 2020-06-12 | 西安航天发动机有限公司 | Integral manufacturing method of pin type head interlayer shell of aerospace engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112548106A (en) * | 2021-02-26 | 2021-03-26 | 中国航发上海商用航空发动机制造有限责任公司 | Method for repairing ultrathin structure by additive manufacturing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111974999B (en) | 2021-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3065982C (en) | Method for controlling deformation and precision of parts in parallel during additive manufacturing process | |
| Peng et al. | Study on improvement of surface roughness and induced residual stress for additively manufactured metal parts by abrasive flow machining | |
| WO2018091000A1 (en) | Combined additive manufacturing method applicable to parts and molds | |
| KR20190119154A (en) | Method for manufacturing strain wave gear flexplanes using metal additive manufacturing | |
| KR100213855B1 (en) | Separation type grinding surface plate and grinding apparatus using same | |
| US10357819B2 (en) | Investment casting of hollow components | |
| EP2628568B1 (en) | Titanium aluminide article with improved surface finish | |
| EP0877657B1 (en) | Investment casting molds and cores | |
| CN106077643A (en) | A kind of integral manufacturing method of S 04/S 08 high strength stainless steel three-dimensional closed impeller | |
| JP2019507250A (en) | Method and apparatus for manufacturing parts using continuous deposition of layers | |
| CN109079137B (en) | In-situ preparation method for gradient powder feeding laser additive manufacturing high-entropy alloy | |
| CN111974999B (en) | Shape control method for 3D printing of thin-wall pipeline part | |
| US20200338630A1 (en) | Method for producing a ceramic core for the production of a casting having hollow structures and ceramic core | |
| KR101779659B1 (en) | Chemically and Mechanically Abrasive Fluidized Bed Machining System | |
| CN111182982A (en) | Method for producing a ceramic core for producing a cast part having a cavity structure, and ceramic core | |
| WO2015185001A1 (en) | Incremental manufacturing method for part or mold | |
| CN113560816B (en) | Manufacturing method of large frame beam component of space engine | |
| Shi et al. | Additive manufacturing and foundry innovation | |
| US5339888A (en) | Method for obtaining near net shape castings by post injection forming of wax patterns | |
| CN115488342B (en) | Short-process preparation method of dissimilar metal integral She Panzeng and other materials | |
| JPH08258023A (en) | Extruding die and its manufacture | |
| CN108472774B (en) | Method for coating an injection mould | |
| GB2550345A (en) | Component manufacturing | |
| Rech et al. | New trends in hybrid finishing processes of metallic additively fabricated parts–a short review | |
| Patel et al. | Post-processing for metal-based additive manufacturing techniques |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |