METHOD AND DEVICE FOR PRODUCING ROD HAVING VARIABLE CROSS-SECTION OF COMPOSITE MATERIAL Russian patent published in 2006 - IPC E04C5/07 

FIELD: building reinforcement members, particularly rods of composite material, namely of glass-reinforced plastic.

SUBSTANCE: method involves forming pipe of fibrous material previously impregnated with polymeric binding agent; inserting core member, which defines cross-sectional rod shape in the pipe; laying stressed annual fibers; polymerizing and cutting the rod. Part of outer surface of rod to be cut in area of annular fiber location is subjected to local linear moving contact pressure before annular fiber laying. The local pressure is applied transversely to fibers and may be aligned in correspondence with current rod cross-section change. Contact area width is not less than annular fiber winding pitch. Device for above method realization comprises bobbin carrier, impregnating unit, annular pickup, crimping die, core member, swivel to provide transversal annular fiber winding, polymerization path, pulling means and cutting mechanism. The device is provided with local linear movable contact pressure application means, which applies local linear movable contact pressure to part of outer surface of rod to be produced, wherein the means may regulate necessary contact pressure to be applied. The means comprises loop-like flexible working member passing over rod surface to which compressed medium energy source pressure is acted. The energy source is formed as hydraulic or pneumatic cylinder. Above means comprises at least two flexible working members spaced apart in rod cross-sectional plane to provide balance of forces acting relatively longitudinal axis thereof. Each working member may rotate about rod to be produced and is provided with compression spring or tension spring or torsion spring. Each working member may be formed as curvilinear rod brought into contact with rod by concave surface thereof or each working member is made as straight bar or as bar having ends provided with plate extending obliquely to bar axis or with straight or curvilinear convex surface facing rod. Above means may be arranged in front of swivel and has independent drive to rotate rotary working members and each working member has fulcrum parallel to rod axis. Above means may be connected to the swivel and fulcrums of each working member are transversal to longitudinal rod axis.

EFFECT: extended functional capabilities due to provision of stable rod quality, uniform composite material structure over rod length and cross-section, increased rod strength and provision of demanded rod cross-sectional configuration regardless of current rod diameter change due to maintaining immovability of longitudinal composite material fibers in radial direction when annular fibers are in stressed state.

11 cl, 4 dwg