◎ adopting numerical control technology and spinning drawing process, the wall thickness change is controlled below 5%, which can be ignored;
◎ diameter change range: wall thickness 0.1~0.3 (mm), outer diameter 0.35~3 (mm);
◎ repeated stretching and pretensioning mechanism are adopted to ensure that the roughness of inner wall is not affected during the reducing process;
◎ the coaxiality of large and small diameters is within 0.05mm after reducing;
◎ the reducing angle is generally 12 to 14 degrees, and other angles can be negotiated;
◎ there are ready-made molds for common specifications, and special specifications can be negotiated;