DEVELOPMENT OF WOOD-POLYMER COMPOSITE MATERIALS FOR SLIDING BEARINGS IN FRICTION UNITS OF SEED SCREW CONVEYORS
Keywords:
cotton ginning industry, screw conveyor, sliding bearing, friction unit, wood-polymer composite materials, physical and mechanical properties.Abstract
This paper presents research results on the possibility of manufacturing sliding bearings for friction units of screw conveyors used in cotton seed transportation from wood-polymer composite materials. To develop a composite material for sliding bearings, the physical and mechanical properties of its main components were studied based on standard materials used in mechanical engineering. Willow wood, which is widely available in the Republic of Uzbekistan, is proposed as the wood component for composite materials.
For impregnating the wood-composite material, a hot-cold bath method is proposed, and for wood compaction - an evaporation method with corresponding implementation technologies. It is noted that a portable hardness tester model MED UD was used to measure the hardness of samples.
The research results show the relationship between the physical and mechanical properties of wood and its degree of compaction. It was established that wood density is directly proportional to the degree of compaction, and this relationship has a linear character. The results also show the dependence of wood strength limit, its hardness, and modulus of elasticity along fibers on the degree of compaction.
The effect of wood saturation with polymer composite was studied, and comparative results are presented; if in the initial state, for example, willow has a density of 0.49 g/cm³ and hardness of 4.73 MPa, then after saturation with polymer composite, the density reaches 0.89 g/cm³ and hardness up to 8.05 MPa, while additional compaction increases these values to 1.01 g/cm³ and 10.17 MPa, respectively.
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