24 results about "Stl file" patented technology

The invention relates to a DEM-CFD-VOF coupling model-based method for analyzing movement of a desulfurizing agent in a ladle, which belongs to the technical field of computer simulation and comprises the following steps of: 1, drawing a ladle model and a stirring paddle model by utilizing modeling software, and exporting a corresponding STL file; 2, importing the STL file into software with a DEM model, and establishing a motion control equation of desulfurizer particles; and step 3, importing the STL file into software with a CFD model, performing mesh generation on the ladle model containing the stirring paddle by using a mesh generation tool, establishing a control equation of a liquid phase (molten iron) and a gas phase (air), and tracking free interfaces of the gas phase and the liquid phase and the like by adopting a VOF model in the software with the CFD model. According to the method, the DEM-CFD-VOF coupling model is established to describe movement and dispersion behaviors of desulfurizer particles in the ladle, so that evaluation on the desulfurization effect of the ladle is realized.

The invention relates to a bracelet parameterization design and optimization system, and belongs to the field of jewelry design. The system comprises a Grasshopper-based modeling module which is used for regulating and controlling modeling through 14 geometric parameters; the semantic mapping module is used for establishing a correlation model of parameters and user aesthetic evaluation by using an SVM (Support Vector Machine); the genetic algorithm module is used for forming closed-loop feedback of design parameters and modeling scores by adopting a crossover variation iterative optimization scheme; the prototype output module generates an editable 3D model and an STL file. According to the system, parameterized design and machine learning are fused, rapid generation of diversified models and personalized demand matching are achieved, and the limitation of traditional design innovation is broken through. The optimized three-dimensional model can be directly driven to be manufactured by 3D printing or numerical control equipment, the production cycle is shortened, and the infringement risk is reduced. Through intelligent design flow recombination, an efficient and high-adaptability innovative solution is provided for the jewelry industry.

This invention provides a method, system, and device for workpiece segmentation and pose estimation in stacked scenarios, relating to the field of 3D point cloud processing technology, aiming to solve the problems of inaccurate segmentation and large registration errors in traditional algorithms. The method includes: downsampling a standard model STL file constructed by CAD software to obtain a point cloud file; acquiring 3D point cloud data of stacked workpieces using a 3D acquisition device; segmenting the point cloud data using an improved Euclidean clustering algorithm after preprocessing to obtain individual workpiece target point clouds; extracting PPF features from the preset model point cloud and the target point cloud, and generating an initial pose through coarse PPF registration; generating multiple sets of perturbed poses based on the initial pose, and verifying and selecting the optimal pose through voxel voting; using the optimal pose as the initial value, obtaining the final pose through fine ICP registration. Ultimately, this improves segmentation accuracy and registration precision, accelerates processing speed, and is suitable for industrial automated sorting and positioning scenarios, demonstrating strong practicality.

The invention discloses a digital guide plate virtual implant positioning and precision analysis method and system, and belongs to the technical field of oral implantation, and the method comprises the steps: S1, importing a design guide plate STL file and a printing guide plate mouth scanning STL file into Magics software, and respectively positioning respective predicted implant positions; s2, fitting the two files in the step S1 together in Exocad software by taking the feature points on the guide plate as media; and S3, outputting the fitted STL file, importing the fitted STL file into Magics software, and quantifying the angular deviation of the implant according to the angular deviation of the linear positions in the two implants. According to the method, the positioning error of the digital guide plate virtual implant is reduced, the efficiency and the quantification precision are improved, and three-dimensional analysis can be realized.

The application discloses a multi-material precise sand laying and multi-gray collaborative printing control method and belongs to the sand mold 3D printing field. The application designs an STL sand mold model according to the solidification characteristics of a casting, adds different sand mold material properties to the read STL file after reading the STL model, then carries out surface coloring editing processing on the sand mold unit triangular facets with different sand mold material properties, subsequently saves the processed multi-material sand mold model and carries out slicing, outputs a slice PNG file with sand mold properties and different regional colors, and a pixel conversion device in a printing control system carries out pixel two-bit gray value conversion and integration on the slice file. Different sand mold units correspond to different colors, different color regions are divided into different gray values, different grays correspond to different resin injection amounts, multi-material sand mold resin content is injected on demand, sand is laid layer by layer, printing is carried out layer by layer, and the printing work of the multi-material sand mold is completed.

The invention discloses an automatic modeling method and system for complex terrains and buildings / structures in consideration of surface roughness, and the method is realized based on an open source tool, and comprises the steps: collecting the types of terrains, buildings and roughness, and the actual measurement data of a wind field; automatically processing the topographic data through a script and generating an STL file with a transition section; simplifying the building contour and removing abnormal points by using an RDP algorithm and a standard deviation method; filtering the small building and calculating equivalent roughness; generating a building STL in combination with an open source modeling tool; a roughness surface patch is generated on the basis of the DaviportWieringa classification and the equivalent roughness; fusing the terrain, the building and the roughness surface patch; and in OpenFOAM, accurate binding of roughness and computational grids is realized through grid patch association, and wind field simulation and verification are carried out. According to the method, full-process automation is achieved, the modeling efficiency can be improved, the precision deviation of near-surface wind field simulation is reduced through a double-path roughness processing mechanism, and the problems that a traditional method is time-consuming in modeling, insufficient in precision and dependent on commercial software are effectively solved.

The invention discloses a similarity-based mold and mold frame recommendation method. The method comprises the following steps of receiving a target STL part file path and a to-be-compared part folder path input into a user; reading three-dimensional model data of the target STL partition, extracting point cloud information of the three-dimensional model data, and calculating volume and spatial distribution; segmenting and slicing the three-dimensional point cloud data of the target part, and respectively generating multiple space group slices in the X-axis direction, the Y-axis direction and the Z-axis direction; traversing each STL file in the to-be-compared part folder, reading file data one by one, and obtaining three-dimensional point cloud and algorithm providing information of the file data; calculating the similarity of the target part and the to-be-compared part in the aspects of space slice, volume, normal vector and the like, and generating the similarity score of each compared part; and performing weighting processing on the similarity score to generate a weighted similarity score, and performing sorting recommendation according to the score. The method has the advantages of being high in matching speed, high in accuracy and the like, and solves the problems of standard management of the formwork library and long time of designing the formwork library by technicians.

The application discloses a method for simulating and optimizing the structure of nickel-based high-temperature alloy selected area laser melting forming, which comprises the following steps: establishing a three-dimensional model of a part in a 3D modeling software and exporting the three-dimensional model as an STL file; adding support to the model in additive manufacturing software; importing the model into simulation software and setting relevant parameters to start running the simulation software; solving to obtain displacement deformation and stress distribution of the part generated in the laser additive manufacturing process; analyzing the solving result to perform structural optimization design on the part to avoid forming failure; and the simulation software is adopted to simulate the displacement deformation and stress distribution of the laser additive manufacturing GH3536 nickel-based high-temperature alloy part, thereby providing technical guidance for successfully forming the aerospace high-performance part by laser additive manufacturing, and being favorable to reducing the trial and error cost and improving the forming quality.

The invention discloses an automatic curved surface generation method suitable for PowerMill software. The automatic curved surface generation method comprises the following steps: S1, acquiring reference geometric data and dispersing the reference geometric data into a group of point columns; s2, performing geometric transformation on the point columns in the step S1 according to a set mode to generate a second group of point columns; s3, constructing continuous triangular plates according to the two groups of point columns to generate a continuous triangular curved surface grid; s4, writing each triangular plate obtained in the step S3 into an STL file according to an ASCII format; and S5, loading the file obtained in the step S4 by utilizing PowerMill so as to generate a curved surface model. The method has the beneficial effects that the generation of the curved surface can be completed only by utilizing PowerMill, the curved surface does not need to be constructed in CAD software, and the problem of compatibility and precision loss caused by cross-software cooperation is avoided.

This disclosure relates to a method and system for segmenting faces of component in STL files. The method may include detecting by a controller an expanding and contiguous set of triangles based on an order of occurrence thereof in the STL file. Further, the method may include identifying by the controller a plurality of hard edges and a plurality of hard co-edges of each triangle from the expanding and contiguous set of triangles. Further, the method may include determining by the controller a closed loop formed by collating the plurality of hard edges and the plurality of hard co-edges. Further, the closed loop may form a boundary corresponding to a face. Further, the method may include segmenting by the controller at least one face by identifying at least one boundaries corresponding to the face based on the determining the closed loop.

The invention relates to an acupuncture robot path planning method based on improved slicing, which comprises the following steps: step 1, based on a prefabricated member digital model and acupuncture parameters, constructing a coordinate system, creating an equidistant parallel tangent plane, segmenting the digital model, discretizing a segmented curved surface into a triangular mesh surface, and obtaining a triangular mesh surface; extracting vertexes of the triangular mesh surface to generate acupuncture path key points in batches, and converting the acupuncture path key points into STL format files; step 2, establishing a'vertex-triangular surface 'topological relation based on an STL file, traversing acupuncture path key points in batches to form an acupuncture path, and encrypting acupuncture points in a large-curvature area at a corner of the rotation-like preform according to a normal vector change rate eta of adjacent acupuncture points; and step 3, based on the coordinates of the needling points and the adjacent needling points, calculating robot tail end attitude information in batches, solving Euler angles and transmitting data to the robot. According to the method, the calculation complexity is effectively reduced, the needling precision and efficiency of the complex special-shaped prefabricated body are improved, and the requirement for automatic needling forming of the variable-cross-section rotary prefabricated body is met.

A quality monitoring device, method, and additive manufacturing equipment for laser sintering process are disclosed. The device includes: a host computer that generates scanning data from the STL file of the part to be printed and sends it to a scanning control unit; a scanning control unit that generates laser switch command signals and laser power command signals based on the scanning data and sends them to the laser, and generates motion control commands and sends them to the scanning unit; and a timing acquisition, analysis, and logic judgment unit that acquires the actual output power signal from the laser in real time, as well as the laser switch command signals and laser power command signals sent to the laser by the scanning control unit, and determines whether the laser is working normally by comparing the actual output power signal, the laser switch command signal, and the laser power command signal, and alarms when the laser is malfunctioning. This invention provides more precise monitoring, recording laser power data down to each scanning line, providing detailed data for additive manufacturing equipment.

The invention discloses a selective melting additive manufacturing method for a nickel-based C276 material micro-channel with an ultra-small bending radius. The method comprises the steps that high-precision three-dimensional modeling is conducted on a target micro-channel part with the ultra-small bending radius; obtaining a minimum support structure according to the geometric features and the thermal field simulation result, and embedding the minimum support structure into the STL file to form a complete construction file; according to the complete construction file, printing parameters of a printer are dynamically adjusted in the selective melting process in combination with the target micro-channel part configuration and C276 powder characteristics; carrying out support structure removal and annealing treatment on the printed piece; and the printed piece is subjected to inner wall roughness polishing. By means of the manufacturing method, the nickel-based C276 material micro-channel part with the ultra-small bending radius can be manufactured, wherein the nickel-based C276 material micro-channel part is high in ultra-small bending radius adaptability, high in size precision, excellent in surface quality, low in residual stress and resistant to corrosion.

The invention discloses a geometric model generation method for efficient heat flow analysis, a pretreatment system and equipment, relates to the technical field of electronic product design, and solves the technical problems that an existing model pretreatment process is time-consuming, tedious, error-prone and unfavorable for design iteration. The method comprises the following steps: acquiring and analyzing a group of design parameters of the radiator; determining a space coordinate set of the radiator through the design parameters; in the virtual three-dimensional space, M basic geometric entities are constructed through the space coordinate set; integrating the M basic geometric entities through Boolean union operation to generate an integrated entity; the integrated entity is subjected to triangularization processing, basic information of a plurality of triangular patches is obtained and stored in an STL file so that computer-aided engineering can conduct grid division, and the basic information of the triangular patches comprises vertex coordinates and normal vectors. The geometric model generation method is efficient, simple and capable of generating high-precision and high-quality integrated entities.

The application provides a shell-based lattice structure with a mesh simplification feature and a design and preparation method thereof, and belongs to the technical field of precision forming. The design method adopts truncated cubic octahedron (TCO) as a basic unit, the geometric appearance of which is regulated by a shape parameter beta, and then introduces an octagonal prism height h as a design variable, adjusts the h value to control the proportion of the unit cell in the space volume, realizes the decoupling of the volume fraction and the geometric appearance, constructs a shell-based TCO lattice structure through difference set operation of the outer-inner lattice structure, characterizes the gap-solid boundary of the shell-based TCO lattice structure through two groups of triangular facets, and realizes the direct conversion of the lattice structure model and the STL file. The problems of geometric distortion and data redundancy and the like existing in the STL conversion of the three-period minimal surface structure are solved.

This utility model provides a crack detection device for hydraulic engineering inspection, comprising a drone, on which a handheld coordinate measuring machine (CMM) and a host computer detachably connected to the handheld CMM are fixedly mounted. The host computer contains 3D modeling software. The handheld CMM is connected to the host computer via a wireless transmission module. The handheld CMM is connected to the host computer via a USB data cable, and the exported data format of the handheld CMM is .stl file. This utility model provides a crack detection device for hydraulic engineering inspection, which can efficiently and quickly detect cracks in large dams, offering convenience, speed, and high accuracy, greatly improving inspection efficiency.

A method for forming a patient-specific implant (PSI) part for application to a resected body part to form a reconstructed part involves utilizing a StereoLithography (STL) model of the reconstructed part with trace lines and the location of screw holes for screws to fasten the PSI to the resected body part in forming the reconstructed part. The trace lines are processed using cubic-spline data interpolation and smoothing, followed by the generation and transformation of rectangles to create a skeleton that forms the implant's surface model. The screw holes are added to the model after the trace lines are processed. Next, the model is converted into an STL file, which is made available for forming implant material into the PSI.

The invention provides a shell base dot matrix structure with a grid simplification characteristic and a design and preparation method thereof, and belongs to the technical field of precision forming. According to the design method, a truncated cubic octahedron TCO is adopted as a basic unit, the geometrical morphology of the TCO is regulated and controlled by a shape parameter beta, then the octagonal prism height h is introduced to serve as a design variable, the proportion of unit cells in the space volume is controlled by adjusting the h value, decoupling of the volume fraction and the geometrical morphology is achieved, and the design precision is improved. A shell-based TCO lattice structure is constructed through difference set operation of an outer-inner lattice structure, a gap-entity boundary of the shell-based TCO lattice structure is represented through two groups of triangular patches, and direct conversion between a lattice structure model and an STL file is realized. The problems of geometric distortion, data redundancy and the like existing in three-period minimum curved surface structure STL conversion are solved.

This invention belongs to the field of SPH modeling technology, specifically disclosing an automatic generation method and system for SPH particle models and surface geometry models. The method includes: constructing raster data for a terrain elevation model and a source thickness distribution model; performing data standardization to unify the spatial reference of the terrain elevation model and the source thickness distribution model; resampling the standardized raster data to ensure that the raster cell size matches the particle physical properties; generating terrain boundary particles using a layered generation algorithm and completing source particle filling; generating a surface geometry model in STL format based on the raster vertex coordinate set; and outputting particle coordinates and an STL file that meet the requirements of the SPH solver, thus completing the automatic generation of the SPH particle model and surface geometry model. This invention solves the problems of low processing efficiency, high data alignment error, and insufficient surface geometry accuracy in existing SPH modeling methods.

The application belongs to the technical field of additive manufacturing, and relates to a metal additive manufacturing method based on curved surface layering, which comprises the following steps: 1) reading an STL file of a part to be printed, and establishing a spatial topological relation between triangular facets in the STL file of the part to be printed; 2) generating a curved surface separated from a model of the part to be printed based on the triangular facets on the curved surface of the model of the part to be printed according to the spatial topological relation between the triangular facets; wherein the model of the part to be printed is generated through the STL file of the part to be printed; 3) offsetting the curved surface separated from the model of the part to be printed to intersect with the model of the part to be printed, and obtaining a contour line for curved surface printing; 4) generating an internal filling path for curved surface printing in the contour line for curved surface printing; and 5) completing an additive manufacturing process by using a laser based on the contour line and the internal filling path. The application can eliminate the step effect and spheroidization problem occurring in the forming process, and improve the forming quality.

The application provides a reconstruction method of a vane pump three-dimensional model based on an STL file, and specifically comprises the following steps: STL model data reconstruction of the vane pump based on a half-edge data structure; feature edge extraction of the STL model of the vane pump based on geometry preservation; sub-region division of the STL model of the vane pump based on an angle limit; STL model re-triangulation of the vane pump based on a RAR algorithm, including the following steps: constructing four operation operators; constructing constraint conditions of the operation operators based on the idea of geometry feature preservation, so as to preserve the geometry features of the vane pump model; determining a quality measurement index, so as to iteratively optimize the local vane pump STL model, and finally completing the model reconstruction. The application starts from the vane pump STL model, realizes the reconstruction of the vane pump STL model under the condition that the overall structure of the vane pump STL model is complete, and improves the quality of the triangular facets of the vane pump STL model.

The invention provides a data processing method for volume 3D printing, an evaluation system and a storage medium, and relates to the technical field of volume additive manufacturing, and the method comprises the steps: carrying out voxelization on a three-dimensional target model of an STL file, then carrying out Radon transformation, and carrying out filtering back projection preprocessing to generate a 360-degree projection grayscale image of the three-dimensional target model; target model reconstruction is carried out through inverse radon transformation, and a target area and a background area of the projection grayscale image are divided; calculating error doses of the two areas, executing Radon transformation to respectively carry out error projection of the two areas, and obtaining total error projection through superposition; subtracting the total error projection from the initial projection to obtain a new iterative projection; and performing inverse radon transformation reconstruction on the iterative projection and calculating a loss function value, if the loss function does not reach a threshold value, continuing iterative optimization on the iterative projection until the threshold value is reached, and outputting a final projection. According to the method, breakthrough improvement is achieved in the aspects of printing precision, edge fidelity and quality evaluation objectivity.

The application belongs to the technical field of laser additive manufacturing, and discloses a preparation process of an additive manufacturing pure titanium piece, the pure titanium piece and application. The preparation process of the additive manufacturing pure titanium piece comprises the following steps: creating a three-dimensional model diagram of the pure titanium piece to generate an STL file; importing the STL file into data processing software to perform layering and slicing processing to generate a scanning path; using pure titanium powder as raw material powder to perform laser powder bed fusion additive manufacturing to obtain a blank; performing heat treatment and surface treatment on the blank to obtain the additive manufacturing pure titanium piece; wherein the heat treatment comprises first stage heat treatment and second stage heat treatment in sequence; and the surface treatment comprises surface polishing. The preparation process of the additive manufacturing pure titanium piece can reduce internal defects, refine grains, reduce residual stress and improve surface quality, thereby significantly improving the plasticity (elongation after fracture) and fatigue performance of the pure titanium piece.