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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||72/69 ; 72/81 ; 72/84 ; 228/60|
|발명자 / 주소||
|인용정보||피인용 횟수 : 3 인용 특허 : 0|
A method of producing a hermetically sealed, preferably sphere-shaped end in a tubular workpiece, residing, according to the invention, in that an end of a tubular workpiece is heated to a forging temperature and is then reduced until a portion is obtained with a diameter equal to that of a sphere to be obtained. Afterwards, a semi-sphere is subjected to spinning applied to the end of said reduced portion until a hermetically sealed end is formed. This is followed by spinning of a necking portion until a sphere is obtained, the spinning of the constricte...
A method of producing a sphere having a hermetically sealed end at an end of a tubular cylindrically shaped workpiece, wherein the diameter of the sphere is less than the diameter of the tubular workpiece, comprising the steps of heating a tubular workpiece end to a forging temperature; reducing the diameter of said end of the tubular heated workpiece until a tubular end portion is obtained with a diameter equal to the diameter of the sphere to be formed; roll-shaping the end portion of the reduced diameter tubular end portion of the workpiece until a se...