RU2152873C1 - Mandrel for manufacture of pipes from composite materials - Google Patents

Abstract

FIELD: processing of polymer composite materials. SUBSTANCE: mandrel includes load-bearing rod and form-shaping members mounted on it. Load-bearing rod has holes which are perpendicular relative to axis of mandrel. Form-shaping members for inner recesses are made in form of segment rings provided with circular grooves. These grooves have holes which are perpendicular relative to axis of rings. Segments of rings are secured on load-bearing rod by means of studs made from low-strength material; they are received by holes of ring segments and load-bearing rod. Section of segment of ring has shape of scalene triangle whose obtuse angle is rounded-off. EFFECT: possibility of making inner grooves on article; facilitated removal of mandrel. 1 dwg

Description

 The invention relates to equipment for processing polymer composite materials and can be used to obtain products by winding.

 Washable mandrels are known, see book. Handbook of Composite Materials, Vol. 2, Moscow. "Engineering", 1988, p. 217.

 The disadvantage is the low compressive strength of the material of such a mandrel.

 Known mandrel with a retractable forming surface, see and.with. USSR 1669748 A1, B 29 C 53/82, Bull. N 30, 08/15/91.

 The disadvantage of this mandrel is the difficulty of forming the internal grooves in the product. The technical result of this invention is to simplify the formation of internal grooves in the pipe and removal of the product from the mandrel.

 This goal is achieved by the fact that in the mandrel for the manufacture of pipes from composite materials containing a supporting rod and the elements of the forming surface mounted on it, the supporting rod has holes perpendicular to the axis of the mandrel, and the elements of the forming surface for the formation of internal grooves in the pipe are made as cut into segments of rings having annular grooves in which holes are made perpendicular to the axis of the rings, while the segments of the rings are fixed to the supporting rod using studs nizkoprochnogo of material entering the opening segments and the carrier ring shaft and an annular coil wiring segments in annular grooves, the cross section of a ring segment has a figure-sided triangle with rounded obtuse angle.

 The implementation of the forming elements for the inner grooves in the pipe in the form of rings cut into segments allows you to disassemble the ring after the manufacture of the pipe.

 Fastening the forming rings on the supporting rod using studs of low strength material allows you to remove the product from the mandrel after polymerization by pulling the products along the axis of the mandrel and cutting the studs.

 The execution of a segment of a ring with a cross section in the form of a figure of a miscellaneous triangle with an obtuse angle rounded allows you to form an inner groove in the pipe with a cross section in the form of this figure, which will lead to a reduction in effort when disassembling pipe joints and eliminating injury to the annular seal.

 Patent studies have shown that no solutions having features similar to the distinguishing features of the present invention were found, which gives the right to judge the materiality of the differences between these features, and the combination of essential features gives the invention new properties - making internal grooves and simplifying removal of the product.

 The invention is illustrated by the drawing, which shows the design of the mandrel.

 The mandrel 1 for manufacturing a pipe 2 from composite material contains a supporting rod 3 with holes 4 and elements of the forming surface for the internal grooves in the form of rings 5 cut into segments, having annular grooves 6 in which holes 7 are made. The ring segments 5 are fixed on the supporting rod 3 with the help of pins 8 of low-strength material entering the holes 7 of the segments of the rings and the holes 4 of the supporting rod and are additionally fastened with an annular winding with a bundle 9 in the annular grooves of 6 segments, wherein The ent of the ring 5 has the figure of a versatile triangle, the obtuse angle of which is rounded.

 An example of a specific implementation.

 Mandrel 1 for the manufacture of fiberglass pipe 2 by winding on a steel supporting rod 3 of glass-wool RBN 10-1260 (TU 6-48-70-91), impregnated with hot-cured epoxy resin ED-20 GOST 10587-84, followed by curing by heating, contains a supporting rod 3 with holes 4 ⌀ 3 mm and elements of the forming surface for the inner grooves of the pipe in the form of rings cut into segments 5. The rod 3 has a diameter of 327 mm. Rings 5 have an inner diameter of 327 mm, a width of 30 mm, and a height of 10 mm.

 In the rings 5, annular grooves 6 are made of a width of 6 mm, a depth of 3 mm and holes 7 ⌀ 3 mm. The segments of the rings 5 are fixed on the supporting rod 3 with the help of pins 8 made of wood or polyethylene and are additionally fastened with a ring winding with a bundle 9 in the grooves of 6 segments of the rings, while the section of the segment of the ring 5 has the shape of a versatile triangle with a rounded obtuse angle.

Claims (1)

 A mandrel for the manufacture of pipes made of composite materials containing a supporting rod and elements of the forming surface mounted on it, characterized in that the supporting rod has holes perpendicular to the axis of the mandrel, and the elements of the forming surface for the internal grooves are made in the form of rings cut into segments having ring grooves in which holes are made perpendicular to the axis of the rings, while the segments of the rings are fixed to the supporting rod using studs made of low-strength material, included holes in ring segments and the carrier rod, and annular grooves in the winding wiring ring segments, wherein the cross section of a ring segment has a figure-sided triangle, an obtuse angle which is rounded.