FIELD: process engineering.
SUBSTANCE: invention relates to production of tubular beams. Tubular beams are made from composition containing filler and binder. Note here that said filler contains particles and/or fibres of vegetable origin. Note also that said binder comprises thermosetting resin. Proposed method comprises continuous extrusion of said composition by screw extruder furnished with forming channel and screw shaft arranged therein. Proposed method comprises loading performed at screw extruder loading zone. Then, composition is compacted and formed in compaction zone and heat treated in zone of heat treatment and curing of screw extruder. Note here that content of thermosetting resin in said composition makes 2-15% of absolutely dry resin weight relative to that of absolutely dry filler weight. Composition is compacted to preset density and formed to required shape in compaction zone, solidified and cured in solidification and curing zone of screw extruder. Tubular beam shape and sizes are fixed at said stage and hardened. Note that forming channel in compaction zone features gradually converging polygonal cross-section in extrusion direction. After hardening and curing, finished tubular beam is obtained of required outer shape and wall density of 600-1100 kg/m3. Besides, tubular beam has central through round cross-section bore. Surface of said bored has continuous rib coiling relative to central axis of the beam and extending over the entire length of said inner channel. Note that in said hardening and curing zone, forming channel cross-section that of screw extruder and screw shaft pitch are constant.
EFFECT: higher hardness and stability, efficient production.
18 cl, 12 dwg
