VERFAHREN ZUM HERSTELLEN VON ARMATURENGEHAEUSEN AUS METALL, INSBESONDERE AUS STAHL, VORZUGSWEISE ZUM HERSTELLEN VON SCHIEBERGEHAEUSEN, UND VORRICHTUNG ZUM DURCHFUEHREN DES VERFAHRENS

摘要

A method of manufacturing metal casings, particularly gate valve casings, comprises, forming two casing shell half portions from a plate by holding the plate and forming a valve port in at least one of the plates with a forming tool, forming wall portions of the plate bounding the port into axially inwardly and axially outwardly extending collars bounding the opening and joining the two casing shell half portions together by a longitudinal weld which is accessible to ultrasonic and radiographic inspection to form a fluid- and pressure-tight casing. A device for carrying out the method comprises forming tools for imparting a shell, shaped to the plates and upper and lower dies which are provided with recesses for holding fast and forming or overforming flange-like collars. The collars may be formed with a forming tool having recesses for receiving displaced material forming the collars or a tool may be provided with upper and lower dies having working faces conformable to the shape of the respective casing part and capable of accommodating or receiving at least one forming tool, such as a roller or upsetting ram.