CN110901047A - Additive manufacturing method based on curved surface tangential shell type growth - Google Patents
Additive manufacturing method based on curved surface tangential shell type growth Download PDFInfo
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- CN110901047A CN110901047A CN201911226028.6A CN201911226028A CN110901047A CN 110901047 A CN110901047 A CN 110901047A CN 201911226028 A CN201911226028 A CN 201911226028A CN 110901047 A CN110901047 A CN 110901047A
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- contour
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- shell
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000000654 additive Substances 0.000 title claims abstract description 11
- 230000000996 additive effect Effects 0.000 title claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 230000033001 locomotion Effects 0.000 claims abstract description 11
- 239000012778 molding material Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000011257 shell material Substances 0.000 abstract 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
-
- 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
Abstract
An additive manufacturing method for shell mold growth along the tangential direction of a curved surface belongs to the field of additive manufacturing. Drawing a three-dimensional CAD model of the product, processing the three-dimensional CAD model to obtain each layer of processing contour line of the contour surface of the model, and enabling the side surface of the processing tool to be tangent to the contour surface. And adjusting the movement of each shaft of the forming device, so that the end part of the control sheet at one side of the extrusion opening is contacted with the top end point of the formed shell at the upper layer, the end part of the control sheet at the other side is adjusted to the upper surface of the formed shell at the upper layer or the extension line position of the formed shell at the upper layer, the forming material extrudes the forming material through the extrusion opening and is bonded with the formed shell at the upper layer, after the space to be formed is filled with the forming material, the extrusion opening moves forwards, and the formed shell material is solidified subsequently until the forming of the contour shell is completed. The invention has the advantages and effects that: the forming area is small, the forming speed is high, and the efficiency is high; the curved surface modeling is realized by a method of approximating a broken line segment to a curve, the step effect is avoided, and the surface precision of the curved surface is high.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and relates to an additive manufacturing method for increasing a shell mold along a curved surface in a tangential direction.
Background
Additive manufacturing (also called 3D printing) generally comprises the steps of dividing a three-dimensional geometric entity with a complex shape into thin slices with simple outlines layer by layer, manufacturing the shape of the slice at the bottom layer, processing the slices layer by layer from bottom to top, and stacking and accumulating the slices to manufacture a three-dimensional entity part.
Common additive manufacturing methods include SLA method, FDM method, SLS method, etc., and the main process principle thereof is summarized as follows.
The SLA method, the earliest developed rapid prototyping technology. The method uses photosensitive resin as raw material, controls ultraviolet laser by a computer, and scans the surface of the photosensitive resin point by point according to the information of each layered section of a part. The resin layer in the scanned area is cured by photopolymerization to form a thin layer of the part. After one layer is cured, the worktable moves downwards by a layer thickness distance to coat a new layer of liquid resin on the surface of the original cured resin, and the steps are repeated until a three-dimensional solid model is obtained.
The FDM method heats and melts the filamentous hot melt material, simultaneously, the three-dimensional spray head selectively coats the material on a workbench under the control of a computer according to the sectional profile information, and the material forms a layer of section after being rapidly cooled. After one layer is formed, the machine table is lowered by one height (namely, the layering thickness) and then the next layer is formed until the whole solid modeling is formed. A
SLS method, spreading the powder, laser beam under computer control, sintering selectively according to the information of the layered cross section, sintering the next layer after one layer is finished, and removing the redundant powder after all the layers are finished to obtain a sintered part.
Based on the principle of 'layered slicing-layer-by-layer accumulation', the additive manufacturing method cuts the complexity of the shape of the part along with the manufacturing difficulty and cost, and can prepare any complex shape in principle. But the manufacturing period is longer, and in addition, the step effect on the surface of the product is more obvious. To reduce the step effect, a method of reducing the layer thickness is generally adopted, which in turn reduces the molding efficiency and increases the molding time. In industrial production, for complex curved surface or structure products, if the speed is high and the precision is high, the method has important significance for improving the production efficiency and the product quality and enhancing the market competitiveness of the products.
Disclosure of Invention
The invention provides an additive manufacturing method for shell type growth along the tangential direction of a curved surface.
The technical scheme of the invention comprises the following steps:
step 1: and drawing the three-dimensional CAD model of the product by using three-dimensional modeling software.
Step 2: processing the three-dimensional CAD model to obtain each layer of processing contour line of the contour surface of the three-dimensional CAD model, wherein the side surface of a processing tool is tangent to the contour surface, the distance between the processing contour lines is determined according to the characteristics of the curved surface and the actual forming requirement, and the contour line information comprises the coordinate value (x) of a pointContour lines、yContour lines、zContour lines) And the processing direction and the like, and the processing contour line of each layer is the motion trajectory line of the extrusion port in subsequent processing.
And step 3: the forming mechanism has a multi-axis movement function, can adjust the coordinate position and the angle of the extrusion opening and the length of the extrusion opening control sheet, and performs shell forming according to the sequence from bottom to top in the forming process; according to the processing contour line information of each layer, the movement of each shaft of the forming device is adjusted, so that the end part of the control sheet at one side of the extrusion opening is in contact with the top end point of the formed shell at the previous layer (if the extrusion opening moves according to the contour line of the first layer, the end part of the control sheet is in contact with the substrate), the end part of the control sheet at the other side is adjusted to the upper surface of the formed shell at the previous layer or the extension line position thereof, the control sheet (which can be seen as a small line segment) approaches to a curve through the extrusion opening to form the product contour, and meanwhile, the forming.
And 4, step 4: uniformly mixing the molding materials (such as powder, adhesive and the like) of the shell, extruding the molding materials through the extrusion port, bonding the molding materials with the previous layer of molded shell (if the extrusion port moves according to the contour line of the first layer, bonding the extrusion materials with the substrate), and moving the extrusion port forwards after the molding space is filled with the molding materials until the molding of the contour shell of one layer is completed; the molding material of the shell has certain strength after bonding and curing so as to ensure the stability of the size and the structure of the shell in the molding process.
And 5: and (5) repeating the steps 3 to 4 to complete the forming process of the whole model.
The invention has the advantages that:
(1) the forming speed is high. The molding area of the method is the outline of the product, and is realized by a shell mold method, and the molding area is small, so that the molding speed is high, and the efficiency is high.
(2) The molding precision is high. The section of the molded contour can be regarded as being formed by connecting broken line segments, namely, the curved surface molding is realized by a method of approximating a curve, and the step effect is avoided, so that the surface precision of the curved surface is high.
(3) The application potential is large. The curved tangential shell molding can be carried out simultaneously, and the inside or the outside of the shell can be filled so as to enhance the strength of the molded part or expand the application range of the molded part.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the equipment system of the present invention.
Fig. 3 is a dimension diagram (gourd-shaped complex curved surface) of an embodiment of the present invention.
FIG. 4 is a schematic diagram of a manufacturing process of an embodiment of the present invention.
In the figure, 1 a multi-axis motion system; 2 forming raw material feeding system; 3 a molding material mixing and extruding mechanism; 4 extrusion port control sheet; 5, forming a platform; 6 a molding material mixing and extruding mechanism (embodiment); 7 materials to be extruded (examples); 8 extrusion port control sheet (example); 9 area to be shaped (example); 10 formed housing area (example); 11 housing upper and lower layer interfaces (example); 12 inner surface of the housing (example); 13 outer contour surface of the housing (example).
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
1. A 3D solid model (fig. 2) of a certain product is designed based on three-dimensional modeling software such as NX, Creo, and the like, and as can be seen from the figure, the model has a complex curved surface shape.
And 2, processing the three-dimensional CAD model to obtain each layer of processing contour line of the outer contour surface of the model, wherein each layer of contour line comprises information contents such as coordinate values of each point, a processing direction and the like, and the processing contour line is a motion track line of an extrusion port in subsequent processing.
3. According to each layer processing contour line information, the motion of each shaft of the forming mechanism is adjusted, and the forming equipment has a multi-shaft motion function so as to ensure that the extrusion opening can be quickly adjusted to a specified position and angle. In order to ensure the precision and the smoothness of the product shell, the end part of the control sheet on the outer side of the extrusion opening is adjusted to the top point position of the outer contour of the upper layer of material, and the end part of the control sheet on the inner side of the extrusion opening is correspondingly adjusted to the upper surface of the upper layer of formed shell or the extension line position thereof.
4. The mixed material to be formed (which can be composed of small particles and a binder) is extruded from an extrusion opening and is bonded with the upper surface of the formed shell of the previous layer, when the corresponding space to be formed is filled up, the extrusion opening moves forwards, the forming material is gradually solidified, and the formed shell has certain strength.
5. The above movement is repeated until the whole product is molded, and the product molded part shown in fig. 3 is obtained, and the product has high external surface dimensional accuracy and smoothness.
Claims (2)
1. A material increase manufacturing method based on curved surface tangential shell type growth is characterized by comprising the following steps:
step 1: and drawing the three-dimensional CAD model of the product by using three-dimensional modeling software.
Step 2: and processing the three-dimensional CAD model to obtain each layer of processing contour line of the contour surface of the three-dimensional CAD model, wherein the side surface of a processing tool is tangent to the contour surface, the distance between the processing contour lines is determined according to the characteristics of the curved surface and the actual forming requirement, and the contour line information comprises the coordinate value, the processing direction and the like of each point.
And step 3: according to the processing contour line information of each layer, the movement of each shaft of the forming device is adjusted, so that the end part of the control sheet at one side of the extrusion opening is contacted with the top end point of the formed shell at the previous layer (if the extrusion opening moves according to the contour line of the first layer, the end part of the control sheet is contacted with the substrate), the end part of the control sheet at the other side is adjusted to the upper surface of the formed shell at the previous layer or the extension line position thereof, the control sheet (which can be seen as a small line segment) approaches to a curve through the extrusion opening to form the product contour, and meanwhile, the forming material.
And 4, step 4: the molding materials (powder, binder and the like) are uniformly mixed, the molding materials are extruded through the extrusion opening, the molding materials are bonded with the previous layer of materials (if the extrusion opening moves according to the first layer of contour line, the extrusion materials are bonded with the substrate), and after the molding space is filled with the molding materials, the extrusion opening moves forwards until the molding of the contour shell of one layer is completed.
And 5: and (5) repeating the steps 3 to 4 to complete the forming process of the whole model.
2. The method of claim 1, wherein the additive manufacturing process is based on curved tangential shell growth, and wherein:
(1) and processing the three-dimensional CAD model to obtain each layer of processing contour line of the contour surface of the three-dimensional CAD model, wherein the side surface of a processing tool is tangent to the contour surface, the distance between the processing contour lines is determined according to the characteristics of the curved surface and the actual forming requirement, and the contour line information comprises the coordinate value, the processing direction and the like of each point.
(2) According to the processing contour line information of each layer, the movement of each shaft of the forming device is adjusted, so that the end part of the control sheet at one side of the extrusion opening is contacted with the top end point of the formed shell at the previous layer (if the extrusion opening moves according to the contour line of the first layer, the end part of the control sheet is contacted with the substrate), the end part of the control sheet at the other side is adjusted to the upper surface of the formed shell at the previous layer or the extension line position thereof, the control sheet (which can be seen as a small line segment) approaches to a curve through the extrusion opening to form the product contour, and meanwhile, the forming material.
(3) The molding materials (powder, binder and the like) are uniformly mixed, the molding materials are extruded through the extrusion opening, the molding materials are bonded with the previous layer of molded shell (if the extrusion opening moves according to the first layer of contour line, the extrusion materials are bonded with the substrate), and after the molding space is filled with the molding materials, the extrusion opening moves forwards until the molding of the first layer of contour shell is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226028.6A CN110901047A (en) | 2019-12-04 | 2019-12-04 | Additive manufacturing method based on curved surface tangential shell type growth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226028.6A CN110901047A (en) | 2019-12-04 | 2019-12-04 | Additive manufacturing method based on curved surface tangential shell type growth |
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| Publication Number | Publication Date |
|---|---|
| CN110901047A true CN110901047A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911226028.6A Pending CN110901047A (en) | 2019-12-04 | 2019-12-04 | Additive manufacturing method based on curved surface tangential shell type growth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112172145A (en) * | 2020-10-13 | 2021-01-05 | 青岛科技大学 | 3D who prints angle and layer height adjustable beats printer head device |
| CN114474714A (en) * | 2022-01-20 | 2022-05-13 | 北京南方斯奈克玛涡轮技术有限公司 | Tiltable powder bed for laser beam additive manufacturing and device comprising tiltable powder bed |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160176109A1 (en) * | 2013-08-06 | 2016-06-23 | Airbusgroup Limited | Extrusion-based additive manufacturing system and method |
| CN106564182A (en) * | 2016-10-21 | 2017-04-19 | 浙江理工大学 | Rapid forming method capable of compositing fiber and resin-based material |
| CN106671411A (en) * | 2016-12-28 | 2017-05-17 | 浙江理工大学 | Rapid forming method capable of compounding chopped fibers and thermoplastic resin |
| CN107685149A (en) * | 2017-08-28 | 2018-02-13 | 江苏大学 | A kind of method and device for improving laser gain material manufacture thin-wall part forming quality |
| CN108582416A (en) * | 2018-04-25 | 2018-09-28 | 湖南筑巢智能科技有限公司 | A kind of large and medium-sized ware manufacturing method |
| CN108891029A (en) * | 2018-07-30 | 2018-11-27 | 大连理工大学 | The planing method of continuous fiber reinforced composite materials 3D printing typical path |
-
2019
- 2019-12-04 CN CN201911226028.6A patent/CN110901047A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160176109A1 (en) * | 2013-08-06 | 2016-06-23 | Airbusgroup Limited | Extrusion-based additive manufacturing system and method |
| CN106564182A (en) * | 2016-10-21 | 2017-04-19 | 浙江理工大学 | Rapid forming method capable of compositing fiber and resin-based material |
| CN106671411A (en) * | 2016-12-28 | 2017-05-17 | 浙江理工大学 | Rapid forming method capable of compounding chopped fibers and thermoplastic resin |
| CN107685149A (en) * | 2017-08-28 | 2018-02-13 | 江苏大学 | A kind of method and device for improving laser gain material manufacture thin-wall part forming quality |
| CN108582416A (en) * | 2018-04-25 | 2018-09-28 | 湖南筑巢智能科技有限公司 | A kind of large and medium-sized ware manufacturing method |
| CN108891029A (en) * | 2018-07-30 | 2018-11-27 | 大连理工大学 | The planing method of continuous fiber reinforced composite materials 3D printing typical path |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112172145A (en) * | 2020-10-13 | 2021-01-05 | 青岛科技大学 | 3D who prints angle and layer height adjustable beats printer head device |
| CN114474714A (en) * | 2022-01-20 | 2022-05-13 | 北京南方斯奈克玛涡轮技术有限公司 | Tiltable powder bed for laser beam additive manufacturing and device comprising tiltable powder bed |
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