9 results about "Surface type" patented technology

The present application relates to the technical field of optical aspheric surface, especially points to a kind of free curved surface characterization method based on CGH lens zero position compensation detection optical path, with the detection of free curved surface as the guide, based on zero position compensation detection principle, according to ray tracing method, Snell's law, diffraction principle and equal optical path principle, using the parameters required by interferometer incident wave front as plane wave, compensator as single CGH lens zero position compensation detection system indirectly characterizes free curved surface shape, by using XY polynomial and Zernike standard phase polynomial, the mathematical description of free curved surface is realized in design stage can determine its measurement scheme, and according to the characterization method self-defined a kind of aspheric surface type, called zero position free curved surface.The free curved surface characterization method improves the degree of freedom of free curved surface shape and the feasibility of zero position compensation method, reduces the detection difficulty of free curved surface shape, realizes the function of zero position free curved surface design can be detected.

The invention discloses a shape error correction method for free-form surface machining, which comprises the following steps of: analyzing the path characteristics of an original cutter through a linearization error theory, establishing a slow cutter servo turning cutter path simulation model, and describing the cutting path of the cutter by adopting an Archimedes spiral. And on the basis, cutter radius compensation is carried out, cutter contact data after compensation are obtained, and the accuracy of a cutting track is ensured. Then, obtaining point clouds of the free-form surface to be processed, and obtaining source point clouds and target point clouds respectively; in order to realize reliable matching between the source point cloud and the target point cloud, point cloud coarse registration is used for coarse registration, and then point cloud fine registration is used for fine registration. And finally, calculating a shape error through a least square method, and applying the shape error to correction so as to obtain a processed free-form surface type.

The invention provides an automatic identification method and system for contour features of a blasting area of bench blasting, and the method comprises the following steps: defining a contour surface type of blasting design based on blasting design requirements; intercepting a target three-dimensional surface patch excavation body from the three-dimensional terrain or the design model, and determining the construction sequence of the target three-dimensional surface patch excavation body relative to other excavation bodies; obtaining normal vectors and geometric features of each patch of the target three-dimensional patch excavation body, and identifying the contour surface type to which each patch belongs according to the defined contour surface type; and extracting and fitting to generate contour lines and contour points based on the identified various contour surfaces. According to the method, the time for manual identification in the blasting area is effectively shortened, the data processing efficiency is improved, and application and development of automation and intelligence of intelligent blasting design in surface mines, large capital construction projects and the like are promoted.

The invention relates to the technical field of optical element machining, and particularly discloses an x offset value adjusting method and device for aspheric surface, spherical surface and free-form surface machining and a storage medium. A corresponding aspheric coefficient is input for programming, and the aspheric arc height is determined to be correct; acquiring aspheric surface shape errors, and when the surface shape errors are in an M shape, a V shape, a W shape and an inverted V shape, changing the curvature radius R to convert the aspheric surface shape errors into the V shape or the inverted V shape; obtaining a PV value of a V-shaped or inverted V-shaped surface error and a corresponding x coordinate; in the aspheric software, a z value is input, a deviation value of an aspheric surface is calculated, for the aspheric software which completes parameter programming, an x coordinate is input, a corresponding vector height value z value is obtained, an x + x coordinate is input, a corresponding vector height value z + z is obtained, and x is a cutter deviation value generated by a machine tool during machining; inputting a cutter deviation value in the corresponding cutter number parameters of the single-point machine tool; and after aspheric surface measurement analysis, cutter radius or program radius adjustment is carried out according to the R.

The invention discloses a quadric surface fitting method for a three-dimensional model, electronic equipment and a storage medium. The method comprises the following steps: calculating grid information in a triangular surface grid of a three-dimensional model, wherein the grid information at least comprises a normal direction of a triangular surface, a normal direction of each vertex, a main curvature and a main direction; extracting a multi-target feature based on the grid information, wherein the multi-target feature comprises a dihedral angle feature, a curved surface type feature and a cross field rotation feature corresponding to a main direction; performing feature segmentation on the triangular surface grid according to the multi-target features to obtain a plurality of sub-blocks; and fitting and merging the plurality of sub-blocks to obtain a target quadric surface. By using the scheme of the invention, quadric surface processing with accurate segmentation, efficient combination and accurate fitting can be realized.

The invention discloses an SLM (selective laser melting) support-free forming method for low-angle feature self-adaptive recognition and shape property regulation and control, which has the following beneficial effects: (1) according to data processing, process configuration and forming processes of a selective laser melting technology, the shape property regulation and control are realized; parameters related to part placement, low-angle area distribution, angle feature self-adaptive identification, key process and forming strategy are optimized, and a reliable forming whole-process solution is provided for support-free forming of complex curved surfaces and closed runners. (2) through the angle feature adaptive identification and shape regulation and control method, complex curved surface feature discrimination and adaptive process configuration can be realized, various curved surface types are divided according to the curved surface features, the forming morphology and size precision of different curved surface features are improved, adaptive identification and shape regulation and control of a complex curved surface structure are realized, and the method is suitable for large-scale popularization and application. The problems of existing low-angle single energy input forming quality and stability are solved, the part forming quality is improved, the component design freedom degree is increased, and data processing and material cost is reduced.

The embodiment of the invention discloses a machining control method, machining equipment, a system and a storage medium. The method comprises the steps that a measurement area and measurement density corresponding to a to-be-machined area of a to-be-machined object are obtained; wherein the to-be-machined area comprises a rotating curved surface; determining a plurality of measurement points based on the measurement area and the measurement density, and generating a rotating curved surface model corresponding to the to-be-processed area according to the plurality of measurement points; in response to an operation of placing the to-be-processed image on the rotating curved surface model, generating a three-dimensional preview model; wherein the three-dimensional preview model is used for providing preview for the processing effect of the to-be-processed area. Therefore, when an object of a rotating curved surface type is machined, the machining effect can be displayed for a user more comprehensively and accurately through the three-dimensional preview model, so that the phenomenon of machining errors is reduced, and the effect of improving the machining reliability is achieved.

Various embodiments of a three-dimensional (3D) tactile map system and methods of implementing the system are described. In one example, the tactile map system includes a map base having a substantially planar substrate defining an x-y plane. The map base includes a top base surface and a bottom base surface, where the top base surface includes a ground surface texture. The tactile map system also includes a 3D scaled representation of a structure attached to the top surface of the map base. The 3D scaled representation can be configured with dimensions that are in proportion to the structure and extend in a z-direction from the base. The z-direction being orthogonal to the x-y plane. The 3D scaled representation includes a plurality of identified surfaces, each of the plurality of identified surfaces having a surface type of a plurality of surface types, each surface type corresponding to a selected surface texture.

The invention relates to the technical field of building information model data processing, in particular to a part batch nesting method based on a BIM model. The method comprises the steps that a part model is imported through a BIM visual programming platform, geometric information is extracted, and after surface discrete points are generated, the SVD plane fitting algorithm is adopted to judge whether a part is of a plane type or a curved surface type; basic grouping is completed based on a judgment result, and secondary filtering is carried out in combination with non-geometric attributes to realize refined grouping; and full-process automatic processing of projection expansion-attribute labeling-format exporting is carried out on curved surface parts, simplified process processing is carried out on plane parts, and a part information association list is synchronously generated. According to the method, through automatic identification classification and differentiation parallel processing channels, batch automatic processing of parts is realized, the curved surface expansion precision is ensured, calculation resource allocation is optimized, coherent circulation from a BIM design model to production processing data is ensured, and the collaborative efficiency of intelligent manufacturing is improved.