Equipment Design And Experimental Study On Abrasion Test Of Flow Passage Components With Low Speed Circulating Sand

In this paper,the design and development of experimental platform equipment for wear and tear of over-current components at low-velocity grit.And using this experimental platform,systematic experiments on abrasive wear of flow-through parts were carried out with low-speed solid-liquid two-phase particles.The solid particles are quartz sand and the liquid is natural water The effect of sand diameter,sand contents and relative wear angle on the quality,volume and strength of the selected flow passage components were systematically studied.In order to investigate the mechanism of abrasion,the low-through parts were characterized by microscopic analysis.This study is conduce to select rational equipment,improve the performance and the service life of the equipment.The main conclusions of the study are as follows:(1)Influence of influencing factors on quality wear strength Qm of specimena.The effect of sand content: The curve of the quality wear strength Qm of Q235,40 Cr and ZL102 are basically similar.Qm mass abrasion strength is proportional to sand content.However,due to the shielding effect of the sand,the growth rate is slowed down and showed a tendency toward saturation and under the same conditions,Qm wear intensities are arranged as follows: Q235,40 Cr,ZL102.b.The effect of sand diameter: The curve of mass wear strength Qm of Q235,40 Cr and ZL102 specimens increased with the increase of particle size.There is non-proportional relation between wear strength and particle size of Qm.c.The effect of relative wear angle: All samples have both cutting and deformation wear during the wear process.Duo to lower hardness of ZL102,pure cutting wear was observed.Therefore its angle-wear characteristic curve is closer to a typical flexible material.As the impact angle increases,the wear loss is reduced.The hardness of the 40 Cr specimen which mainly pure deformation and most obvious brittleness tendency,surface is hardest in the three sample.The angle of maximum wear is closer to 90°.However,the middle hardness of ordinary carbon steel Q235 with prominent composite wear has the characteristic curve between 20° to 40°.(2)Influence of influencing factors on volume wear strength Qv of specimena.The effect of sand content: In the curves of Q235,40 Cr and ZL102 volumetric wear strength Qv and sand content,under the same experimental conditions,the volume wear strength Qv of ZL102 is greater than Q235 and 40 Cr,but the Qm of ZL102 mass wear strength is less than The main reason for Q235 and 40 Cr is that the density of aluminum is the smallest.The volumetric wear strength Qv corresponds to the physical meaning of the wear depth per unit area.b.The effect of sand diameter: The Q235,40 Cr and ZL102 three kinds of sample wear intensity Qv and sand particle size change-curve trend and product wear strength Qv-sand content change curve is similar.c.The effect of relative wear angle: Q235,40 Cr and ZL102 three kinds of sample volume wear intensity Qv-the relative wear angle change curve and the relative wear angle of the sample mass wear strength Qm the same effect.(3)The wear resistance of the material is related to the surface oxidation resistance of the material and does not have a single relationship with the surface hardness properties.The entire wear test process is the repeated process of plastic deformation and micro-cutting off of the sample surface,the substrate and the old oxide film or oxide and sand.