90 results about "SHELL model" patented technology

The invention discloses a preparation method of an oxide ceramic composite shell for precision casting of titanium alloy. The preparation method comprises the following five steps: pressing a wax mold; respectively preparing a surface layer coating, a surface-layer-approaching layer coating, a reinforcing layer coating, a back layer coating and a back layer hardening agent; sequentially dipping the wax mold into the above solutions, and drying to prepare a shell model; dewaxing the shell model; roasting the shell model, and discharging the shell model from a furnace, so as to obtain the shell. The preparation method disclosed by the invention solves the defects that materials are dissolved in water and the air permeability of the shell is poor in existing preparation and dewaxing processes of a shell. The preparation method disclosed by the invention has the advantages that the preparation cycle of the shell is shortened, the production efficiency is increased, dewaxing equipment is simple and is simple and convenient to operate, the surface of the roasted shell is smooth, phenomena such as peeling, shedding, cracking, powder falling and the like on a surface layer are avoided, and the shell is good in air permeability and deformability, and thus a casted titanium alloy casting has a smooth surface, is pollution-free and is low in roughness.

The invention relates to the technical field of FSS (Frequency Selective Surface) radome manufacturing, and specifically discloses a manufacturing method of a curved frequency selective surface array.The manufacturing method comprises the steps of S1, respectively performing three-dimensional modeling on a substrate dielectric shell and a three-dimensional exposure mask shell through three-dimensional modeling software; S2, respectively inputting a substrate dielectric shell model and a three-dimensional exposure mask shell module into 3D printing equipment for molding; S3, coating the outersurface of the substrate dielectric shell with a photoresist, attaching the three-dimensional exposure mask shell to the molded substrate dielectric shell, enabling the two layers to be tightly laminated, and performing exposure processing through exposure equipment; S4, performing development processing, cleaning and drying on the substrate dielectric shell; and S5, preparing a metal film layer on the surface of the processed substrate dielectric shell, and removing the left photoresist by using a photoresist removing liquid, cleaning and drying. The manufacturing method not only can manufacture a hole unit array, but also can manufacture a patch unit array, and has good universality.