METHOD AND DEVICE FOR MANUFACTURE OF A STEEL CASING UNDER PRESSURE, SPECIFIED STEEL CASING UNDER PRESSURE AND PREPARATION FOR IT

摘要

1. A method of manufacturing a steel can, for example a can under pressure with a sealed open end, containing the following operations:! obtaining a steel cup-shaped workpiece; ! deep drawing of a steel cup-shaped workpiece into a drawn can blank; ! shallow hood of the barrel of the drawn blank; and! rolling the open end of the stretched blank of the can with the formation of the blank of the curl and then rolling the blank of the curl into an elongated curl. ! 2. The method according to claim 1, in which the steel cup-shaped billet is obtained by forming from a steel plate, preferably by a drawing operation. ! 3. The method according to claim 1 or 2, in which the deep drawing operation comprises several deep drawing transitions, preferably from 2 to 6 deep drawing transitions, for example three deep drawing transitions. ! 4. The method according to claim 1, wherein the concave bottom of the spray can blank is formed during or after the deep drawing operation. ! 5. The method according to claim 1, in which the free end of the drawn blanks of the spray can is cut, preferably using cropping by compression. ! 6. The method according to claim 1, in which the region of the free end of the drawn blanks of the spray can be crimped to form a neck, preferably, in several transitions compression, for example from 2 to 10 transitions compression. ! 7. The method according to claim 6, in which at least one transition reduction is compression on the mandrel. ! 8. The method according to claim 6, in which the compressed free end is cut, preferably by applying squeezing trim. ! 9. The method according to claim 1, in which the steel is coated on at least one side. ! 10. The method according to claim 9, in which at least about