| 摘要 |
The invention describes an apparatus for producing double-walled composite tubes which have an outer wall with wave peaks and wave valleys and a smooth inner wall. The apparatus ( 10 ) has two rows of shaping-jaw halves ( 12, 14 ) which, along a common shaping section, form a shaping tunnel ( 16 ) for producing the composite tube. At least one pair of the shaping-jaw halves ( 14 ) located opposite one another in the shaping section ( 16 ) has an inner contour ( 22 ) which forms a tube socket portion ( 50 ). The remaining shaping-jaw halves ( 12 ) are alternately designed with transverse grooves ( 18 ) and transverse fins ( 20 ). A sizing mandrel ( 24 ), with narrow vacuum grooves ( 26 ) formed spaced apart from one another in the axial direction on its outer lateral surface ( 28 ), projects into the shaping tunnel ( 16 ) for the smooth inner wall of the composite tube. A vacuum control valve device ( 30 ) is provided for the purpose of realizing defined closure and reopening of the vacuum grooves ( 26 ) which are in each case located in the tube socket portion ( 50 ) in steps with the aid of a drive device ( 38 ) and of flow-connecting them to a vacuum source ( 32 ).
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