22-02-2018 дата публикации
Номер: US20180050382A1
The invention relates to a method and a coating device for applying a cladding layer onto the inner side of a carrier layer during the production of a multilayer heavy-duty pipe, with a pressure-exerting unit having a force application unit. A stable application of the cladding layer is achieved by having the coating device comprise a rolling tool with the pressure-exerting unit and the force application unit, and by providing the pressure-exerting unit with at least one pressure roller having a diameter that is smaller than the inside diameter of the heavy-duty pipe to be produced, and with at least one support element acting diametrically counter thereto with a supporting force in the operating state. 120-. (canceled)21. A method for producing a multilayer heavy-duty pipe with a pipe unit that is composed of an outer pipe forming a carrier layer and at least one inner pipe forming a cladding layer , comprising:introducing the inner pipe into the outer pipe;providing a pressure-exerting unit with at least one pressure roller that has a smaller diameter than the inside diameter of the inner pipe and is rotatably mounted with its rotary axis at a distance from a longitudinal axis of the inner pipe;applying a pressing force aligned radially outward against an inner surface of the inner pipe to the pressure roller; androtating the pressure-exerting unit relative to the pipe unit while rolling the pressure roller on the inner surface of the inner pipe and pressing of an outer surface of the inner pipe against the inner surface of the outer pipe causing local plastic deformation of the inner pipe wall, with the pressure-exerting unit being simultaneously advanced axially during the rolling of the pressure roller relative to the pipe unit.22. The method of wherein during the rolling of the pressure roller claim 21 , the pressing force is selected such that the outer pipe is not expanded or is expanded only slightly claim 21 , below its yield point.23. The method of ...
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