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AssigneeFlexider S.R.L.
InventorSalvatore GAMMINO
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Method in which a continuous butt-sealed rim of a collar defined by corresponding concentric ends, without undulations, of a first wall, radially innermost, and a second wall, radially outermost, of a double-wall bellows is obtained as a continuous butt-weld bead on the corresponding rims, arranged radially adjacent to each other, of the ends of the first and second walls, which have been prepared such that, before welding, they are radially spaced apart from each other by not more than 0.3 mm and with the rim of the second wall that projects in an axial direction with respect to that of the first wall for a length of 0.2-0.4 mm; butt welding is performed with a laser beam directed parallel to an axis of symmetry of the collar, making the latter rotate around the axis to progressively expose the entire perimeter of the rims of the ends of the first and second walls, simultaneously pressing the rims against each other with a force between 1 and 3 kg via spring clamping rollers.
Method for sealing collars of double-wall bellows, in which a continuous butt-sealed rim of a collar defined by corresponding concentric ends, devoid of undulations, of a first, radially inner wall, and a second, radially outer wall, of the bellows is obtained as a continuous butt-weld bead on the corresponding rims, arranged radially adjacent to each other, of the ends of the first and second walls, characterized in that it comprises the phases of:
Double-wall bellows of the type that can be equipped with crack monitoring, comprising an undulated central portion and opposite end portions without undulations defining respective opposite cylindrical collars, said central portion and end portions being defined by a first and a second tubular wall, respectively the radially inner one and the radially outer one, mounted concentrically and between which a spacer element is inserted, said collars being delimited at their own free ends by respective continuous butt-sealed rims, each one defined as a continuous butt-weld bead on the corresponding rims, arranged radially adjacent to each other, of the respective corresponding ends of the first and second walls, characterized in that said continuous weld bead has been obtained by laser butt welding and without filler metal on said rims of the corresponding ends of the first and second walls, such that it has a weld depth, measured in an axial direction, equal to at least twice the radial clearance present between said radially adjacent ends of the first and second walls and, preferably, equal to at least 2.6 mm.
Apparatus for sealing the rims of collars of double-wall bellows, comprising at least a support carrying a plurality of rollers on a first side, of which at least one is motorized, arranged in a manner to be able receive and support a rim of a collar to seal, head clamped at the opposite sides thereof between the rollers, and means for locally welding said rim while said at least one motorized roller generates rotary movement of the collar tangential to said rollers, so as to progressively expose the entire perimeter of said rim to said means of welding, characterized in that said means of welding consist of a laser head carried by the support on a second side, opposite to the first, the support being provided with a through hole aligned with said laser head, and in that, in combination, at least some of said rollers are spring-loaded in a radial direction, said rollers being arranged so as to make said rim pass in front of said through hole during said rotary movement of the collar and to clamp said rim of the collar with a preset force at least in correspondence to said hole.
Dependencies are inferred from the claim text.