2results about How to "Smooth inside and outside" patented technology

The invention discloses a drawing die and a drawing method for improving the surface quality of a high-temperature alloy pipe, the drawing die is simple in structure and reasonable in design, rolling friction on the surface of the high-temperature alloy pipe in cold rolling deformation is changed into sliding friction on the surface of the high-temperature alloy pipe in the drawing process, and the surface quality of the high-temperature alloy pipe is improved in the drawing process. The outer die gradually extrudes through the first outer extrusion section and the second outer extrusion section and finally determines the outer diameter of the high-temperature alloy pipe through the outer sizing section; the floating core block gradually extrudes through the first inner extrusion section and the second inner extrusion section and finally determines the inner diameter of the high-temperature alloy pipe through the inner sizing section; the moving core block is matched with the outer die to realize stepped drawing deformation, and compared with rolling, the defects such as surface pits, wrinkles and microcracks can be effectively reduced, so that the purpose of improving the quality of the inner surface and the outer surface of the high-temperature alloy pipe is achieved; the problem that the surface quality of the existing small-caliber high-temperature alloy pipe is poor can be effectively solved, and the surface quality and the yield of the small-caliber high-temperature alloy pipe can be improved.

The utility model discloses a prefabricated foaming heat preservation pipe which comprises a working steel pipe layer, a polyurethane heat preservation layer is fixedly installed on the outer side of the working steel pipe layer, a high-density polyethylene protection layer is fixedly installed on the outer side of the polyurethane heat preservation layer, and an outer sleeve cylinder is fixedly installed at the rear end of the working steel pipe layer. And an embedded splicing cylinder is fixedly mounted at the front end of the working steel pipe layer. According to the prefabricated foaming heat preservation pipe, the pasting circular rings and the alignment short strips are matched with the outer sleeve cylinder and the embedded splicing cylinder, so that the prefabricated foaming heat preservation pipe is more convenient to splice and firmer after being spliced, the sealing performance of the connecting position is better, the waterproof effect is better, the splicing mode is simpler, and the inside and the outside of the connecting position are smoother; wherein the outer sleeve cylinder and the embedded splicing cylinder are used for splicing, buckling and fixing, the pasting circular ring is used for pasting the polyurethane heat preservation layer and the high-density polyethylene protection layer, rainwater is prevented from directly leaking to the surface of the working steel pipe layer, and the alignment short strips are used for alignment during splicing.