2results about How to "Reduce cutting process" patented technology

The utility model relates to the field of tee pipe fittings, especially to an outer extension equipotential anti-infiltration inner pressure tee, which mainly solves the poor convenience of the tee pipe fitting in the prior art, and comprises a tee pipe fitting made of plastic, the tee pipe fitting comprises a main pipe and a branch pipe integrally connected with the main pipe, the main pipe has a first interface, a second interface and a first flow channel connecting the first interface and the second interface, the branch pipe has a third interface and a second flow channel connecting the third interface and the first flow channel, the central axis of the first flow channel and the central axis of the second flow channel are vertically distributed, a point where the central axis of the first flow channel intersects with the central axis of the second flow channel is defined as a foot point, the ratio of the distance between the first interface and the foot point to the distance between the second interface and the foot point is 1:2-6, an arc transition structure is arranged at the connection between the first flow channel and the second flow channel, and the arc radius of the arc transition structure is 0.5-0.9 times the diameter of the first flow channel.

This invention relates to a uniformly dense curved polyurethane foam core material, its rotational foaming preparation method, and an antenna sandwich structure, belonging to the technical field of polymer material foaming molding and composite material structure manufacturing. In the key stage of the polyurethane mixture foaming reaction, this invention drives the mold to rotate continuously and uniformly around the central axis of the antenna surface, placing the liquid in a microgravity state where centrifugal force and gravity are balanced, eliminating density stratification and preparing a curved polyurethane foam core material with a density difference ≤5%. This core material is then composited with a fiber-reinforced resin composite skin to obtain the antenna curved sandwich structure. This invention achieves near-net-shape forming through the conformal design of the mold cavity and the antenna reflector surface, and strengthens the interface bonding by setting a film reinforcement layer between the skin and the core material. This invention effectively improves the surface accuracy stability and electrical performance consistency of the antenna reflector surface, and has the advantages of simple process, low cost, and wide applicability.