| As terrestrial oil and gas exploration gradually entered a period of decline,marine oil and gas began to develop rapidly.The geological characteristics of oil and gas resources in shallow sea areas have high similarity with terrestrial oil and gas fields,and have been developed earlier.In recent years,global offshore oil and gas exploration and development has shifted to the deep sea.Pipeline steel is one of the most economical methods for transporting oil and gas,but at the same time it will work in high pressure and harsh environment for a long time,and it will face the risk of damage more or less.The rapid development of the wire saw machine has become the best choice for cold cutting in subsea pipeline maintenance.At present,the research on cutting steel-based materials in diamond wire sawing machine in China is still at a preliminary stage.This paper is based on the research of the Study on cutting and wear characteristics of the diamond wire saw cutting steel-based materials for deepwater environment.For the lack of research on diamond bead-cut steel-based materials,diamond particles and steel-based materials modle have been established.The cutting model is used to simulate and analyze the cutting force cutting temperature rasidual stress and friction characteristics during cutting.Based on the understanding of the development status and theoretical research of underwater diamond wire saws at home and abroad,this paper designs a diamond wire saw test machine,which mainly explores the quantitative relationship between the tension of the bead rope and the feed speed during the cutting process.The research was carried out,and the cutting friction mechanism of diamond string bead was studied and analyzed.By studying the friction mechanism of the contact surface between diamond particles and steel-based materials,the bond-slip friction model was used to analyze the influence of the change of friction coefficient on the cutting force under different cutting angles and cutting speeds during cutting,and the influence of cutting speed and friction coefficient on the residual stress distribution on the workpiece surface were studied.Based on the established cutting friction model,the cutting heat and cutting temperature during the cutting process of diamond particles were analyzed.The effects of cutting speed,cutting depth and particle rake angle on the cutting temperature of diamond particle cutting X56 pipeline steel were explored,and analyze the influence of friction coefficient on cutting temperature under the condition of cutting parameters.The friction experiment was carried out on the multi-layer brazed diamond bead,and the mathematical model of the friction coefficient established by the simulation was verified.The analysis of the variation law of friction coefficient during cutting friction.The influence of friction speed and load variation on the friction coefficient between diamond particles and X56 pipeline steel was analyzed by single factor method.Analysis of the surface topography of brazed diamond beads after actual cutting. |
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