Device for laser transmission welding and method for laser transmission welding
AssigneeFresenius Medical Care Deutschland GmbH
InventorsFranz Kugelmann, Lars Moser, Andreas Klemm
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Abstract
A device for the laser transmission welding of two plastic assembly parts is provided, wherein at least one of the plastic assembly parts contains an absorber for laser light, comprising a processing head with a processing side, with a processing-side discharge shaft for at least one laser beam and with a laser-transparent pressing means for pressing together the plastic assembly parts, wherein the laser-transparent pressing means is guided decoupled from the processing head in the discharge shaft. Furthermore, a method for producing a welded joint between two plastic assembly parts by laser transmission welding is specified.
Claims16
A device for laser transmission welding of two plastic assembly parts, wherein at least one of the plastic assembly parts contains an absorber for laser light, the device comprising:
- a processing head including:
- a processing side;
- a processing-side discharge shaft for at least one laser beam;
- and
- a laser-transparent pressing means for pressing together the plastic assembly parts;
- wherein the laser-transparent pressing means is guided decoupled from the processing head in the discharge shaft
- wherein the pressing means is movable in a direction towards and away from the processing side,
- wherein the discharge shaft has a cylindrical cavity in and by which the pressing means is guided,
- wherein the discharge shaft has an internal diameter, and the pressing means has an external diameter that is smaller than the internal diameter of the discharge shaft,
- wherein the discharge shaft has a discharge opening for the at least one laser beam, the discharge opening has a diameter that corresponds to the external diameter of the pressing means,
- wherein the external diameter of the pressing means has a range of about 15 mm to about 50 mm, and
- wherein the pressing means has a density in a range of about 1.5 kg/dm3 to about 6 kg/dm3.
A device comprising:
- a processing head comprising a discharge shaft defining a cylindrically-shaped cavity, the discharge shaft defining a discharge opening for a laser beam;
- a pressing means comprising a ball positioned within the cavity, the ball being displaceable within the cavity and along a longitudinal axis of the cavity, the ball is configured to exert a pressing force on two or more plastic parts, the pressing means has a diameter between about 20 mm to about 40 mm and a density of about 3 kg/dm3 to about 4 kg/dm3;
- and
- a pressurized-fluid connection directed into the cavity and supplying a pressing fluid on the pressing means so that the pressing force exerted by the pressing means on the two or more plastic parts is intensified,
- wherein the device is provided for laser transmission welding of the two or more plastic parts, and
- wherein at least one of the two plastic parts contains an absorber for laser light.
Dependencies are inferred from the claim text.