CN114782618A - Parameterized design method for 3D printing protective mask - Google Patents
Parameterized design method for 3D printing protective mask Download PDFInfo
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Abstract
The invention discloses a parametric design method for a 3D printing protective mask, which specifically comprises the following steps: step 1, classifying the sizes of key parts of the human face; step 2, dividing the face feature positioning points according to the size classification result of the step 1; step 3, collecting facial feature data; step 4, determining a positioning point according to the data of the receipt in the step 3; step 5, capturing a key part curve of the human face according to the positioning point position determined in the step 4; step 6, drawing a protective mask closed part curve; and 7, constructing a three-dimensional model of the protective mask. The method has short design period and the designed protective mask has good protective sealing performance.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and relates to a parameterization design method of a 3D printing protective mask.
Background
Protective masks are generally devices composed of components such as breather valves, protective cotton sheets, face masks, and the like, and are used for protecting the face from flying metal debris, harmful gases, liquid splashes, metal and high-temperature solvent dust. The existing protective mask can well play a role of protection, but also has the following defects: (1) the general preparation method of the protective mask adopts mold-opening processing production, but the mold-opening processing process is complex, the manufacturing of the mold is complex and difficult, the production process is complex and various, the production period is long, and the production cost is high; (2) the mask is not friendly to special working people, cannot meet the individual requirements of the special working people, and can influence the normal operation of workers when the protective mask is worn, for example, the normal work cannot be carried out due to the fact that fog obstructs the sight; (3) the breathing valve of the protective mask of some protective masks (4) is troublesome to disassemble and assemble, the structure is complex, the mass is large, the wearing is uncomfortable, and the problems of poor comfort, poor fitting performance and poor sealing performance caused by repeated gas in the inner cavity of the respiratory mask are solved.
Methods for the preparation of personalized 3D printed protective masks are proposed in patents CN111421822A and CN111569296A, but have significant drawbacks: (1) because the patent adopts the mode of scanning the face to obtain the face type related data and then performing Boolean operation, although the face type can be completely reproduced, the face type is different, the face needs to be scanned and subjected to Boolean operation again every time the personalized design is performed, the corresponding relation of parameters is not involved, and the details of how the face information is converted into the basic components of the protective mask are not described, so the method is not specific; (2) the face information is obtained through the scanner, but the scanner is not a basic daily article, so that the personalized customization is inconvenient. A protective mask based on the "split nose and mouth" type is proposed in patent publication No. CN111251607A, but has significant drawbacks: the protective mask not only needs to block harmful gas and virus and germs, but also has the function of protection and isolation, does not consider the protection of the face part of the human face, and is not comprehensive in protection.
In the face of the revolution brought to society by the information era, the modern personalized design also has new positioning, in the face of the design form of parametric design with accurate size, complex structure and exaggerated shape, the method is afraid of being difficult to finish by only depending on the traditional handicraft, so the 3D printing mode can specifically convert the customization requirement of the personalized product into the process parameter of additive manufacturing, the technical advantages of small batch, multiple scale, high molding precision and the like of additive manufacturing are fully exerted, and the personalized customization requirement is effectively responded. Therefore, there is a need for a protective mask that can be customized, designed parametrically, and manufactured quickly.
Disclosure of Invention
The invention aims to provide a 3D printing protective mask parametric design method, which solves the problems of long period and incomplete protection in the existing protective mask manufacturing process.
The technical scheme adopted by the invention is that the 3D printing protective mask parameterization design method specifically comprises the following steps:
step 3, collecting facial feature data;
step 4, determining positioning points according to the data of the receipts in the step 3;
step 6, drawing a protective mask closed part curve;
and 7, constructing a three-dimensional model of the protective mask.
The invention is also characterized in that:
the specific process of the step 1 is as follows: the method comprises the steps of obtaining facial feature data of a human body, and dividing the obtained data into 8 main feature sizes, specifically: the shape of the nose is face length, face width, width between mandible corners, nose height, nose width, nose depth, minimum width of forehead, and distance from vertex to brow point.
The specific process of the step 2 is as follows: converting the human face feature parameters into positioning point parameter adjustable parameters according to the size features of all parts of the face divided in the step 1, wherein the positioning points comprise the following 9: nasal root point, nasal tip point, nasal point, left and right nasal wing points, frontal vertex, left and right frontal vertex, submental point, left and right cheekbone points and mandibular angle point.
The specific process of the step 3 is as follows: before the size of the head and the face of a human body is collected, marking mark points on the face of a shot person accurately, and fixing the hair; during shooting, shooting a head and face front photograph, a face-down photograph and a side photograph of a person by using a camera respectively, keeping points marked on the face during size acquisition during shooting, and shooting face information of three views at least for 3 times; after shooting, the size of the actual face is measured by a measuring tool line, the reading is carried out by taking centimeter as a unit, and the structure is estimated and read to the two last decimal points.
The specific process of the step 4 is as follows: and (4) according to the facial feature data collected in the step (3), utilizing solidworks three-dimensional modeling software to describe the positions of the 9 positioning points.
The specific process of the step 5 is as follows: the method comprises the steps of introducing an obtained human face picture into SolidWorks according to the actual size, zooming at equal intervals until positioning points in the human face picture coincide with drawn positioning points, manually taking points of contour lines in the picture, capturing a connecting curve between the positioning points and the human face to form a mask sealing frame, introducing point coordinates on the captured contour into an Excel table, and then performing curve fitting by a cftool curve fitting toolbox of Matlab.
The specific process of step 6 is as follows:
step 6.1, deriving coordinates of points on the fitted curve in the step 5 by utilizing Matlab, and deriving the coordinates into a U disk by using a file format txt;
step 6.2, transposing the coordinate point txt file in the step 6.1 to obtain coordinate data;
and 6.3, importing the coordinate data obtained in the step 6.2 into SolidWorks by using the operation of 'inserting a curve through XYZ points' of SolidWorks, and moving the curve until the corresponding face positions are overlapped.
The specific process of the step 7 is as follows:
step 7.1, integrating the positioning points with the curve obtained in the step 5 in solidworks software; step 7.2, generating independent curved surfaces between the drawn curve contour lines by using a curved surface lofting tool and a curved surface filling tool respectively;
step 7.3, sewing all the drawn curved surfaces by using a curved surface sewing tool so that the curved surfaces are in a closed state;
step 7.4, stretching and thickening the thickness of the curved surface on the basis of the drawn curved surface;
and 7.5, respectively modeling the breathing component, the visual component, the close and frame component, the face curved surface component and the wearing component until the protective mask is modeled.
The invention has the following beneficial effects:
1. the invention provides a design method of macroscopic size and mesoscopic size of a protective mask, which is characterized in that the design method of the macroscopic size protective mask is to collect feature data and carry out three-dimensional personalized modeling design according to the objective size of a facial feature part; the mesoscopic size protective mask is designed by improving the mesoscopic size of the protective mask according to the requirements of people on personalized subjective preferences so as to achieve the special function of the protective mask;
2. the invention provides a parameter-adjustable personalized design method, wherein the parameter adjustment refers to the secondary development of solidworks software, so that the method can be adjusted according to own facial feature data without repeated modeling design, the workload is reduced, and the personalized requirement is also better met;
3. the invention perfectly matches the requirements of individuation, high precision and arbitrary processing shape of the protective mask by utilizing the characteristics of low cost, arbitrary processing of the molding shape, small-batch processing, high-precision processing and short processing time of 3D printing preparation, thereby realizing the cross-rapid manufacturing of the protective mask.
Drawings
FIGS. 1(a) and (b) are schematic diagrams illustrating the size classification of key facial regions provided in the parameterized design method of 3D printed face masks according to the present invention;
FIG. 2 is a schematic diagram illustrating the classification and position of the positioning points of the key parts on the left side of the face in the 3D printing mask parametric design method of the present invention;
FIG. 3 is a schematic diagram of a mask fit portion curve capture in the 3D-printed parametric mask design method according to the present invention;
FIG. 4 is a three-dimensional modeling diagram of 5 parts of a protective mask in the parameterized design method of the 3D printed protective mask of the present invention;
FIG. 5 is a three-dimensional modeling diagram of the whole face shield in the parameterized design method of the 3D printed face shield of the present invention;
FIG. 6 is a client interface of a parametric size-driven platform for a protective mask in the parametric design method for a 3D printed protective mask according to the present invention;
fig. 7 is a solid model diagram of the whole protective mask in the parameterized design method of the 3D printed protective mask of the invention.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
The invention discloses a 3D printing protective mask parametric design method, which specifically comprises the following steps: step 1, classifying and defining the sizes of key parts of the face (as shown in the attached figure 1, a figure 1(a) is a face feature map of the side face of a human body, and a figure 1(b) is a face feature map of the front face of the human body): in FIG. 1(a), A: frontal vertex, B: nasion point, C: nose tip point, D: infranasal point, E: a submental point; in fig. 1(b), F: left forehead vertex, G: right frontal vertex, H: left zygomatic point, I: right zygomatic point, J: left nasal ala point, K: right alar point, L: left mandibular angle, M: the angle of the right mandible; in fig. 1(a), h 1: forehead length, h 2: nasal height, h 3: the shape surface is long; w 1: the depth of the nose; in fig. 1(b), w 2: minimum width of forehead, w 3: face width, w 4: nose width, w 5: the angle between the mandible is wide.
The acquired facial feature data are divided into definitions and ranges of 8 major feature sizes: morphology face length, face width, mandibular angle width, nasal height, nasal width, nasal depth, frontal minimum width, crown to brow point spacing (as shown in table 1);
TABLE 1 size classification, definition and Range of key parts of face
TABLE 2 facial feature anchor point Classification and definition
Step 3, facial feature data collection: the invention provides a method for acquiring face data, which comprises the following steps: before shooting, marking mark points on the face of a shot person accurately before collecting the size of the head and the face of the human body, wherein in order not to obstruct the sight of the mark points and a measurer, the hair should be fixed, and the outline part of the face of a shot photo should not be blocked by the hair; when shooting, shooting the front, the top and the side of the head and the face of a person by using a camera respectively, and keeping points marked on the face during size acquisition during shooting, wherein the shot person is required to sit upright naturally, see the front, relax facial muscles and touch the upper and the lower lips, and the three-view facial information is shot at least 3 times; after shooting, measuring the size of the actual face by using a measuring tool (one of a straight ruler, a set square, a corner gauge, a vernier caliper and the like), reading by taking centimeters as a unit, estimating and reading two digits after a decimal point by using a structure, and finally reducing or amplifying the picture according to the actual data of the face to obtain the key data of the face. The purpose of this step is to use the basic conventional shooting equipment and conventional measuring tool to obtain the key data of the face, and has outstanding advantage with the way of obtaining the cooked face characteristic data by three-dimensional scanning: the method can realize free space time measurement to obtain face data anytime and anywhere, and the data has reliability.
Step 4, positioning point drawing: and (4) according to the corresponding positions and the actual size range of the key parts of the face obtained in the step (3), utilizing solidworks three-dimensional modeling software to draw 9 positioning point positions (as shown in the attached figure 2). The step aims to draw a positioning point in three-dimensional software (solidworks), and the positioning point plays a role in positioning subsequent design.
In fig. 2, a: frontal vertex, B: nasion point, C: nose tip point, D: sub-nasal point, E: submental point, F: left forehead vertex, G: right frontal vertex, H: left zygomatic site, I: right zygomatic point, J: left nasal ala point, K: right alar point, L: left mandibular angle, M: the angle of the right mandible; h 1: forehead length, h 2: nasal height, h 3: the shape surface is long; w 1: nasal depth, w 2: minimum width of forehead, w 3: face width, w 4: nose width, w 5: the width between the mandibular angle;
The curve fitting method comprises the following steps: (1) the method comprises the steps of introducing an obtained photo into SolidWorks according to the actual size, zooming at equal intervals until positioning points in the photo coincide with drawn positioning points, manually taking points from a contour line of the photo, capturing a connecting curve between the positioning points and the face fit to form a mask sealing frame, connecting other parts to form a cavity part, introducing point coordinates on the captured contour into an Excel table, and then performing curve fitting by a cftool curve fitting toolbox of Matlab to obtain 6 corresponding curves, wherein the simulation curves are shown in attached figure 3. The purpose of this step is to utilize three-dimensional design software (solidworks), Excel and Matlab software to capture the facial curve, in order to carry on fitting and designing to the facial curve subsequently, and has provided a method that the curve obtains, 6 curve capture system schematic diagrams are shown as the attached figure 3; fig. 3(a) is a zygomatic contour curve, fig. 3(b) is a zygomatic point-to-mandible point simulation curve, fig. 3(c) is a fitted curve of the mandible in the xoy plane, fig. 3(d) is a curve of the mandible in the yoz plane, fig. 3(e) is a zygomatic bone-to-left-frontal point curve, and fig. 3(f) is a zygomatic bone-to-right-frontal point curve.
In the contour line point-taking method, the picture of the top view of the head of the human body is required to be zoomed and adjusted until a positioning point on the picture is coincided with a drawn positioning point, so as to ensure that the selected contour dimension is 1:1 in the real contour of the head of the human body;
step 6, drawing a curve of a sealing part of the protective mask: the Matlab curve fitting method specifically comprises the following steps: (1) deriving coordinates of points on the fitted curve by utilizing Matlab, and deriving coordinate points into the U disk by taking a file format as txt; (2) transposing the txt file to obtain coordinate data; (3) and (3) introducing the curve into SolidWorks by using the operation of inserting the curve into XYZ points of SolidWorks, moving the curve to the corresponding face position for superposition, and performing fine adjustment to finish curve drawing of the corresponding face position. The purpose of this step is to plot the facial characteristic curves for subsequent three-dimensional modeling of the protective mask.
Step 7, three-dimensional macroscopic modeling of the protective mask: based on the anchor point drawing and curve drawing performed in the above steps S4 and S6, the curved surface portion of the whole mask is divided into 5 parts for modeling: the breathing component, the visual component, the sealing frame component, the curved face component and the wearing component (as shown in fig. 4, fig. 4(a) is a breathing component diagram, fig. 4(b) is a visual component diagram, fig. 4(c) is a sealing frame component diagram, fig. 4(d) is a curved face component diagram, and fig. 4(e) is a wearing component diagram.
The curved surface modeling method comprises the following steps: (1) integrating the positioning points and the curve in solidworks software; (2) respectively generating independent curved surfaces between the drawn curve contour lines by using a curved surface lofting tool and a curved surface filling tool; (3) for the perfect application of the subsequent curved surface cutting function, particularly, all the drawn curved surfaces are stitched by a curved surface stitching tool to enable the curved surfaces to be in a closed state, and the purpose of the step is to ensure that the curved surfaces belong to the same curved surface in the subsequent modeling; (4) stretching and thickening the thickness of the curved surface on the basis of the drawn curved surface, wherein the thickening direction is outward extension, and the extension range is (1-3mm), so that the increase of errors caused by the change of the size of the base layer is avoided; (5) respectively modeling a breathing component, a visual component, a sealing and frame component, a face curved surface component and a wearing component until the modeling of the protective mask is finished; (6) the protective mask is checked, and in order to achieve wearing comfort and prevent the skin of a user from being scratched due to sharp edges of the mask, the reverse folding design is performed on the face attachment part. The three-dimensional design of the whole protective mask is shown in figure 5.
Step 8, an individualized macroscopic parameter size driving method of the protective mask: the SolidWorks software is developed secondarily to realize the size driving function of the parameters, and hundreds of API interfaces are provided by the SolidWorks software, so that the programming secondary development can be carried out on the programming languages supporting the OLE and the COM by utilizing the API interfaces.
The specific size driving method comprises the following steps: (1) constructing size parameters of a standard part, including shape face length, face width, mandibular angle interval width, nasal height, nasal depth, nasal width and head apex-eyebrow point distance, and automatically completing size-driven solid modeling of the standard part by a system; (2) the system structure of the protective mask generated in the SolidWorks environment mainly comprises standard part size parameter assignment, a generation module, a SolidWorks kernel and a user interface (as shown in the attached drawing). The method aims to set the size influencing the model structure as variables under the condition that the structure of the part model is kept unchanged by a size driving method, and a series of parts with the same structure and different sizes are obtained by assigning different values to the variables.
And 9, building a parameter size driving platform: (1) firstly, installing code programming software, quoting SolidWorks, Interop, sldworks, SolidWorks, Interop and swconst in a Nuget program package, newly building SolidWorks Singleton for opening and connecting the SolidWorks, and writing codes according to the requirements in the step 8. After the code programming application program is started, clicking connection can be connected with SolidWorks, clicking parameters can be assigned, clicking operation is carried out to modify the size and model building is carried out again, and the size of the parameters of the protective mask drives a platform client interface (as shown in figure 6).
Step 11, designing the mesoscopic size of the personalized protective mask with different requirements: according to the personalized requirements of the step 10, the following design methods for the mesoscopic dimensions of the personalized protective mask with different requirements are adopted:
1. the lightweight mesoscopic design method comprises the following steps: because the light protective mask is always a breakthrough point of the protective mask, the invention changes the printing consumables of the protective mask and the filling density of the protective mask under the mesoscopic size according to the 3D printing preparation characteristics and the light-weight requirement, and the mesoscopic design of the whole frame and the face protection part of the protective mask is changed from printing to the filling density of 20 percent or even lower to prepare so as to achieve the light performance of the protective mask;
2. the breathing component is composed of a breathing valve and a breathing cover, when the needle is in a closed environment for a long time, the protective mask is required to have certain air permeability, otherwise, the breathing difficulty of a wearer can be caused, so that the breathing cover is made into a component with a honeycomb pore structure, and the honeycomb porosity is properly adjusted according to the requirement of the air permeability so as to meet the requirement of the air permeability;
3. the warm keeping requirement is that the protective mask not only can isolate air pollution in winter severe cold seasons, but also needs to have a certain warm keeping effect, and the protective mask is required to have the characteristic of isolating wind and cold from the mesoscopic size design, so that the thickness of the protective mask can be properly increased;
4. the softness requirement is that the protective mask can be attached to the face when being worn for a long time, and the protective mask is required to have the softness characteristic, so that the problems of face damage, wearing discomfort and the like of a user due to long-time wearing are avoided; in order to meet the requirements of special people and individuation, the protective mask can be subjected to macroscopic size parametric individualized design and mesoscopic size function requirement individualized design, and the requirements of people on individuation are basically met.
The invention also provides a design and preparation integrated method of the protective mask, which comprises the following steps:
step A, slicing processing of the three-dimensional model: the method comprises the following steps of importing the protective mask matrix model into slicing software matched with a 3D printer, slicing data of the protective mask matrix model, importing the model into the slicing software, enabling a protective mask model file format designed in modeling software to be stored as an STL format file from an SLDPRT format, enabling the model to be rotated to the optimal printing direction by utilizing the moving and rotating functions, selecting the printing direction with the least time consumption, debugging pre-printing parameters and setting 3D printing parameters: printing temperature, printing speed, printing head used, support, layer height, fill, etc. The main parameters of the adjustment are: printing speed, filling density, filling shape, printing nozzle, nozzle temperature and other key printing parameters. The purpose of the step is to slice the three-dimensional model, preset working parameters during 3D printing and then subsequently carry out practice printing on the three-dimensional model;
the slicing software is one of Simplify 3D, cure;
the pre-printing parameter printing speed is set to be 60 mm/s;
setting a bottom layer edge line of a preprinting parameter as a local support;
the height of a preprinting parameter layer is set to be 0.1 mm;
setting the temperature of a pre-printing parameter spray head to 210 ℃;
setting the temperature of a preprinting parameter platform to be 60 ℃;
the pre-printing parameter filling shape is grid filling;
step B, converting the file format: and storing the 'STL.' format file in the slicing software of the step A as 'G-code.' into the U disk. The purpose of this step is the conversion of the model format, because only a fixed file format can be recognized in the 3D printer, so that the 3D printer can be used for printing.
Step C, preparing a protective mask matrix model: and B, guiding the U disk with the G-code in the step B into a Fused Deposition Modeling (FDM)3D printer, wherein the 3D printer comprises the following steps: the method comprises the steps of starting a 3D printer by switching on a power supply, selecting printing consumables (TPU materials, PLA materials, ABS materials and the like), selecting feeding options to melt the printing consumables to a spray head, leveling a 3D printing platform by using a leveling card, preheating the printing spray head and the platform, selecting a corresponding protective mask G-code. The purpose of this step is to elaborate the preparation process of the protective mask;
step D, assembling parts: and putting the finished filter cotton between the breather valve and the cover, tying the binding band at the corresponding wearing part of the protective mask, and installing goggles on the visual part. The purpose of this step is to assemble each part, finish the assembly of the protective mask finally;
the protection grade of the filter cotton is KN90, KN95 or 3M;
the eye-protecting eyepiece is an antifogging lens.
Claims (8)
- The 3D printing protective mask parametric design method is characterized by comprising the following steps: the method specifically comprises the following steps:step 1, classifying the sizes of key parts of the human face;step 2, dividing the face feature positioning points according to the size classification result of the step 1;step 3, collecting facial feature data;step 4, determining a positioning point according to the data of the receipt in the step 3;step 5, capturing a key part curve of the human face according to the positioning point position determined in the step 4;step 6, drawing a protective mask closed part curve;and 7, constructing a three-dimensional model of the protective mask.
- 2. The 3D-printed face shield parametric design method of claim 1, wherein: the specific process of the step 1 is as follows: the method comprises the steps of acquiring facial feature data of a human body, and dividing the acquired data into 8 main feature sizes, specifically: the shape of the nose is face length, face width, width between mandible corners, nose height, nose width, nose depth, minimum width of forehead, and distance from vertex to brow point.
- 3. The 3D-printed face shield parametric design method of claim 2, wherein: the specific process of the step 2 is as follows: converting the human face feature parameters into positioning point parameter adjustable parameters according to the size features of all parts of the face divided in the step 1, wherein the positioning points comprise the following 9: nasal root point, nasal tip point, nasal point, left and right nasal wing points, frontal vertex, left and right frontal vertex, submental point, left and right cheekbone points and mandibular angle point.
- 4. The 3D-printed face shield parametric design method of claim 3, wherein: the specific process of the step 3 is as follows: before the head and face sizes of a human body are collected, marking mark points on the face of a shot person accurately, and fixing hair; during shooting, shooting a head and face front photograph, a face-down photograph and a side photograph of a person by using shooting equipment respectively, keeping points marked on a face during size acquisition during shooting, and shooting face information of three views for at least 3 times; after shooting, the size of the actual face is measured by a measuring tool line, the number of the actual face is read by taking the centimeter as a unit, and the two last decimal points are estimated and read by the structure.
- 5. The parametric design method for the 3D printed face shield according to claim 4, wherein: the specific process of the step 4 is as follows: and (4) according to the facial feature data collected in the step (3), drawing 9 positioning point positions by utilizing solidworks three-dimensional modeling software.
- 6. A3D-printed face shield parametric design method according to claim 5, wherein: the specific process of the step 5 is as follows: the method comprises the steps of introducing an obtained human face picture into SolidWorks according to the actual size, zooming at equal intervals until positioning points in the human face picture coincide with drawn positioning points, manually taking points of contour lines in the picture, capturing connecting curves between the positioning points and the human face to form a mask sealing frame, introducing point coordinates on the captured contour lines into an Excel table, and then performing curve fitting by a cftool curve fitting toolbox of Matlab.
- 7. The parametric design method for the 3D printed protective mask according to claim 6, wherein the parametric design method comprises the following steps: the specific process of the step 6 is as follows:step 6.1, deriving coordinates of points on the fitted curve in the step 5 by utilizing Matlab, and deriving the coordinates into a U disk by using a file format txt;step 6.2, transposing the coordinate point txt file in the step 6.1 to obtain coordinate data;and 6.3, importing the coordinate data obtained in the step 6.2 into the SolidWorks by using the operation of 'inserting a curve through XYZ points' of the SolidWorks, and moving the curve until the corresponding face positions are overlapped.
- 8. The 3D-printed face shield parametric design method of claim 7, wherein: the specific process of the step 7 comprises the following steps:step 7.1, integrating the positioning points with the curve obtained in the step 5 in solidworks software; step 7.2, generating independent curved surfaces between the drawn curve contour lines by using a curved surface lofting tool and a curved surface filling tool respectively;step 7.3, sewing all the drawn curved surfaces by using a curved surface sewing tool so that the curved surfaces are in a closed state;step 7.4, stretching and thickening the thickness of the curved surface on the basis of the drawn curved surface;and 7.5, respectively modeling the breathing component, the visual component, the close and frame component, the face curved surface component and the wearing component until the protective mask is modeled.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117574466A (en) * | 2023-11-02 | 2024-02-20 | 齐鲁工业大学(山东省科学院) | Respiratory mask design method based on facial three-dimensional data clustering model |
| CN117574466B (en) * | 2023-11-02 | 2024-05-28 | 齐鲁工业大学(山东省科学院) | Respiratory mask design method based on facial three-dimensional data clustering model |
-
2021
- 2021-12-23 CN CN202111588654.7A patent/CN114782618A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117574466A (en) * | 2023-11-02 | 2024-02-20 | 齐鲁工业大学(山东省科学院) | Respiratory mask design method based on facial three-dimensional data clustering model |
| CN117574466B (en) * | 2023-11-02 | 2024-05-28 | 齐鲁工业大学(山东省科学院) | Respiratory mask design method based on facial three-dimensional data clustering model |
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