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1. WO1993010924 - PROCEDE DE REFOULEMENT INTERIEUR ET EXTERIEUR DE L'EXTREMITE D'UN TUBE METALLIQUE

Considéré comme nul:  27.07.1993
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:
1. A method of internally and externally upsetting the end of a metal tube comprising heating the section of the tube to be upset to forging temperature, upsetting the end of the metal tube to provide the end with an increased wall thickness and outside diameter using a first die having a first cylindrical section having an inside diameter substantially equal to the outside diameter of the tube, a second cylindrical section having an inside diameter equal to the increased diameter of the end of the tube and a tapered section connecting the two cylindrical sections and a first mandrel having a first cylindrical section with a diameter substantially equal to the inside diameter of the tube, a second cylindrical section having an outside diameter substantially equal to the inside diameter of the second cylindrical section of the die, and a shoulder between the two sections of the mandrel to engage the end of the tube and force the metal adjacent the end of the tube into engagement with the die,
further upsetting the end of the metal tube to provide the end with an increased wall thickness and outside diameter using a second die having a first cylindrical section having an inside diameter substantially equal to the outside diameter of the tube, a second cylindrical section equal to the further increased diameter of the end of the tube and a tapered section connecting the two cylindrical sections and a second mandrel having a first cylindrical section with a diameter substantially equal to the inside diameter of the tube, a second cylindrical section with an outside diameter substantially equal to the inside diameter of the second cylindrical section of the second die, and a shoulder connecting the first and second sections to engage the end of the tube and force the metal adjacent the end of the tube into engagement with the internal surface of the second die,
reheating the end of the tube to forging temperature, radially pressing the upset end of the tube inwardly with the first die to reduce the outside diameter of the end and form a taper on the inner surface of the tube, and
upsetting the end to thicken the wall thickness and increase the length of the inside taper while reducing the outside diameter using a third die and a third mandrel having a first cylindrical section of reduced diameter to allow the thickness of the tube to be increased and the inside taper lengthened without increasing the outside diameter of the upset, a second cylindrical section having a diameter equal to the diameter of the second cylindrical section of the third die, and a shoulder connecting the two sections for shortening the length of the upset, increasing the wall thickness, and lengthening the inside taper as the mandrel is moved against the end surface of the upset end of the tube.

2. The method of claim 1 in which the upset end of the tube is positioned completely within the second cylindrical section of the die prior to the pressing step.
3. A method of internally and externally upsetting the end of a metal tube comprising heating the section of the tube to be upset to forging temperature, upsetting the end of the metal tube to provide the end with an increased wall thickness and outside diameter using a first die having a first cylindrical section having an inside diameter substantially equal to the outside diameter of the tube, a second cylindrical section having an inside diameter equal to the increased diameter of the end of the tube and a tapered section connecting the two cylindrical sections and a first mandrel having a first cylindrical section with a diameter substantially equal to the inside diameter of the tube, a second cylindrical section having an outside diameter substantially equal to the inside diameter of the second cylindrical section of the first die, and a shoulder between the two sections of the mandrel to engage the end of the tube and force the metal adjacent the end of the tube into engagement with the die to form the tube into a cylindrical section of increased wall thickness, an outside diameter and a tapered section connecting the cylindrical section to the tube,
further upsetting the end of the metal tube to provide the end with a cylindrical section of increased wall thickness and outside diameter and a tapered section connecting the cylindrical section to the tube using a second die having a first cylindrical section having an inside diameter substantially equal to the outside diameter of the tube, a second cylindrical section having a diameter equal to the further increased diameter of the cylindrical section of the tube, and a tapered section connecting the two cylindrical sections of the die and a mandrel having a first cylindrical section with a diameter substantially equal to the inside diameter of the tube, a second cylindrical section with an outside diameter substantially equal to the inside diameter of the second cylindrical section of the second die, and a shoulder connecting the first and second sections to engage the end of the tube and force the metal adjacent the end of the tube into engagement with the internal surface of the second die,
reheating the end of the tube to forging temperature, positioning the tube in the first die with the cylindrical and tapered sections of the tube positioned in the cylindrical section of the first die and radially pressing the upset end of the tube inwardly with the first die to reduce the outside diameter of the cylindrical section of the tube and to form a taper on the inner surface of the tube, and upsetting the end to thicken the wall thickness and increase the length of the inside taper while reducing the outside diameter using a third die and a third mandrel having a first cylindrical section of reduced diameter to allow the thickness of the tube to be increased and the inside taper lengthened without increasing the outside diameter of the upset, a second cylindrical section having a diameter equal to the dieimeter of the second cylindrical section of the third die, and a shoulder connecting the two sections for shortening the length of the upset, increasing the wall thickness, and lengthening the inside taper as the mandrel is moved against the end surface of the upset end of the tube.