5 results about "Surface function" patented technology

The invention discloses an additive manufacturing intelligent repairing and surface optimizing method for a complex special-shaped curved surface, and particularly relates to the technical field of additive manufacturing. A three-dimensional digital model is obtained, and a complex special-shaped curved surface defect area is recognized; extracting a local morphology parameter set; constructing a repair path generation model based on a graph neural network, and performing collaborative optimization of forming precision, residual stress and deposition stability on the path through a multi-objective optimization algorithm; additive manufacturing equipment is controlled to perform material deposition according to the optimized path; carrying out online error detection by adopting a structured light system, judging repair quality through a fuzzy decision tree model, and triggering path reconstruction if the repair quality exceeds a threshold value; after repairing is completed, surface micro texture factors are extracted, and functional texture regulation and control are conducted through the laser micromachining technology; according to the method, high-precision intelligent repair of the complex curved surface area and collaborative improvement of surface function performance are achieved, and the method is suitable for the fields of aerospace, energy, high-end equipment manufacturing and the like.

The invention discloses a porous structure design method based on a deformed three-period minimal curved surface and a porous structure. The design method comprises the following steps: designing a basic equation of a deformed three-period minimal curved surface in a three-dimensional space; designing a curved surface function of the Schwarz P curved surface by introducing periodic conditions and symmetry analysis; the curved surface function is substituted into the basic equation, then the gradient and the divergence of the gradient are calculated to determine the minimum curved surface condition, and finally the implicit equation of the Schwarz P curved surface is obtained according to the minimum curved surface condition; designing a control parameter containing at least two coordinate axis variables to replace a shape factor parameter in the implicit equation, and adjusting the control parameter according to a unidirectional gradient or a cyclic gradient; and designing hole units of the deformed three-period minimal curved surface to construct a porous structure. The anisotropy of the porous structure can be changed by adjusting control parameters according to needs, isotropy can be constructed, the weak part of the porous structure is increased, the wall thickness is increased, and the problem that the anisotropy of the porous structure is prone to fracture or failure is solved.

The present invention relates to a method for processing precision cover parts. The current processing methods have problems such as unstable processing quality of parts and low human-machine efficiency. Through the surface modeling function of NX software, the required flow direction surface is constructed using the grid surface function. In the island area, the concentric curves are split and re-converged, so that the driven tool path bypasses the island area, and then the tool axis is controlled to avoid the raised side along the cutting path. The advantages of the present invention are: 1. There is no empty cutting stroke in the tool path; 2. The situation of overcutting parts such as "knife stab" is eliminated to ensure the quality of parts; 3. The feed speed has been greatly improved compared with the previous method, and the processing efficiency has been improved; 4. The tool path ensures forward milling, and the cutting surface quality has been greatly improved; 5. The cutting speed is constant, the cutting force is uniform, and the service life of the tool is greatly improved. 6. In the five-axis equipment processing scheme, the tool installation length is significantly reduced, the tool rigidity is good, and the processing stability is improved.

The application discloses a design method of a negative Poisson's ratio porous structure based on a three-period minimal surface, and belongs to the field of computer-aided design, and the specific operation steps are as follows: according to an initial minimal surface function, an extended minimal surface is constructed and solidified; considering the geometric characteristics of the generated porous structure and the buckling mode under the critical load, a problem model of constructing the extended three-period minimal surface with the negative Poisson's ratio is established; then, the problem model is simplified according to the geometric characteristics of the porous structure, and the construction parameters of the minimal surface porous structure with the negative Poisson's ratio are obtained through a step-by-step search method. The application realizes the coupling of the negative Poisson's ratio material and the minimal surface porous structure, two commonly used metamaterials, improves the performance and application range of the material, and can be used for guiding engineering design.