Flange blank is defined as a production object made according to the required shape and process size of the finished flange for further processing. It is mainly divided into three categories: casting flange blank, forging flange blank and hot coil flange blank. Next, we will introduce the application of flange blanks in steel gate valves.
In processing flange blanks, we usually use forging technology. Compared with traditional cutting technology, this technology can not only increase the utilization rate of blank processing materials from 40% to more than 70%, but also effectively improve the flange strength. The production efficiency of this flange blank is about 40%.
Steel flange blank processing technology, especially a blank processing technology for flat flange, butt welding flange and prestressed pipe pile end plate flange. The invention comprises the following steps: (1) preparing annular billets; (2) Send the annular billet into the heating furnace and heat it to 500 ℃~1200 ℃; (3) The heated blank is sent to the mold on the roller mill through the raceway, rolled by a pair of rolling rollers of the roller mill, and cooled to obtain the blank of steel flange. The invention has the advantages of fast processing speed, high processing efficiency, low requirements for equipment, and can process large and small steel flange blanks with various specifications and good mechanical strength.