4results about How to "Improve internal and external surface quality" patented technology

The invention relates to a manufacturing method of a small-caliber nickel-copper alloy seamless heat exchange tube. The manufacturing method comprises the steps that S1, a UNS N04400 round steel material is subjected to peeling, PT inspection, shearing, centering, grinding, heating, perforating, water cooling and inspection; s2, a hot-punched blank is only cleaned, and inspection is conducted after point grinding is conducted after internal and external polishing; s3, the obtained pipe blank is subjected to first-pass intermediate product cold rolling, deoiling, straightening, pipe cutting, grinding, inspecting and cleaning; s4, second-pass intermediate product cold rolling, deoiling, heat treatment, straightening, pipe cutting, grinding, inspection and cleaning are conducted; S5, finished product cold rolling is conducted; s6, deoiling a finished product; s7, heat treatment of a finished product; s8, straightening a finished product; s9, performing ultrasonic vortex treatment, water pressure treatment and pipe cutting on a finished product; and S10, finished product surface inspection, size inspection, cleaning, mark spraying and finishing procedures are carried out. The method has the advantages of high one-time inspection qualification rate, yield and dimensional precision of products, good inner and outer surface quality, stable structure performance and high practicability.

The invention discloses a manufacturing method of a high-strength ferrum-stainless steel thin-wall seamless hexagonal pipe. The manufacturing method comprises the steps that multi-pass cold rolling or cold drawing deformation and heat treatment are conducted, and an intermediate product round pipe is machined; performing one-pass cold-drawing on an intermediate product through a cold-drawing die with six arc edges, and processing the intermediate product into a special-shaped pipe with six arc edges; solid solution heat treatment; performing cold drawing on a secondary intermediate product to finish forming of the seamless hexagonal pipe; and carrying out vacuum heat treatment on the formed seamless hexagonal pipe to finish manufacturing and the like. Aiming at the characteristics of high strength, high hardness and poorer plasticity of a ferrum steel material, a seamless hexagonal tube blank is subjected to multi-pass cold rolling and heat treatment, is subjected to transition by adopting a cold-drawing mold with six arc edges, and is subjected to two-time special cold-drawing forming. By means of the method, the problem that forming difficulty is large can be well solved, and the manufactured seamless hexagonal pipe intermediate product special-shaped pipe and the manufactured finished hexagonal pipe are convenient and easy to adjust in size specification, accurate in finished product size control and excellent in inner surface quality and outer surface quality.

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.

This invention relates to the field of metal pipe manufacturing technology, and discloses a method for manufacturing large-diameter, thin-walled TA31 titanium alloy seamless pipes, comprising the following steps: mixing sponge titanium and an intermediate alloy and then melting to obtain a TA31 ingot; forging the ingot into a titanium billet and processing it into a bright rod; and detecting the β transformation temperature T of the bright rod. β Heat the light bar to T β A thick-walled tube blank is obtained by piercing once at 30-80 ℃; the thick-walled tube blank is then heated to T. β The thin-walled tube blank is obtained by extending and piercing at 20-50 °C. This invention combines a single β-region large-wall-thickness piercing with a single α-β two-phase region large-deformation extension piercing, which can produce tube blanks with superior microstructure and properties, providing good initial conditions for subsequent processing. It not only significantly improves product performance but also has high production efficiency and added value, resulting in good social and economic benefits.