Experimental Investigation On Wear-resistance Of Intersectant Surfaces Based On Bionic Theory

In actual production, a lot of molds have intersectant surfaces, whose wear are very serious,especially at the intersectant region. The wear resistence of surface can be enhanced using thetechnology of non-smooth bionic theory which is dealed with laser treatment tenology. Theobjective of the paper is to study the wear-resistence of intersectant surfaces based on bionic theory.Firstly，according to the test conditions and test requirements, the intersectant surfacesspecimen’s with three kinds of angles were made and a friction and wear testing equipment for thespecimens with intersectant surfaces was designed. The material of specimens is7003aluminumalloy, and the material of friction pair is45#steel. Then, according to the bionic non-smooth theory,stripe shape were selected and size and distribution of stripe unit were designed, with width of0.8mm,1.0mm,1.2mm and1.4mm, with angles between stripe units of6°,8°,10°and12°, whichwere processed by laser processing machine.Wear experiments are conducted for pieces of smooth and non-smooth bionic intersectantsurfaces. The experiments were tested for smooth intersectant surfaces specimens, and resultsshowed that the most worn region appeared at the intersectant region between two surfaces. Agroup of full factorial experiments were tested for non-smooth intersectant surfaces specimens, andthe results shown that the non-smooth intersectant surfaces specimens were better than smoothintersectant surfaces specimens in wear resistance. In the range of the stripe unit size anddistribution investigated, the wear resistance was increased with larger stripe width under thecondition of the same angles; the wear resistance increased with smaller angles under the conditionof the same stripe widths. A group of orthogonal experiments were conducted for non-smoothspecimens with intersectant surfaces. The results shown that factors which most affected wear forthe non-smooth specimens with intersectant surfaces were angle between intersectant surfaces, theangle between the stripes and stripes width in that order. When the angle between surfaces is150°,stripe width is1.2mm, and the angle between stripes unit is6°, the stripes’s wear resistance forintersectant surfaces was the best.The comparisons were made between stripe areas and wear areas and found that the weardecreased with the increased striped area. Abrasive wear and adhesive wear was the main type forsurface topography by microscopic analysis. The equivalent Von Mises stress and contact normal stress on the intersectant surfaces were investigated using finite element method and the resultsshown that the stripe unit can reduce the equivalent Von Mises stress and contact normal stress ofthe surface and adjust the distribution of stress.