Study On Forming And Grinding Characteristics Of Laser Cladding W18Cr4V

Manufacturing industry occupies an increasingly important position in national production,and it is an important goal of manufacturing industry to continuously improve the processing quality and efficiency of products.As a new surface repair and strengthening technology,laser cladding technology has the characteristics of energy saving,dexterity,time saving and material saving,and the cladding layer after cladding treatment has the characteristics of high hardness,wear resistance and corrosion resistance.As one of the types of high speed steel with better bearing capacity,W18Cr4 V has the characteristics of high strength,high compressive strength,high thermal stability,high hardness,high wear resistance and low production cost.Therefore,it is of great research significance to use laser cladding technology to cladding W18Cr4 V powder on the workpiece surface to obtain processed products with better comprehensive performance.However,due to the complex process of this technology and the coupling effect between various parameters,the cladding layer obtained has defects such as holes,unfused particles and cracks,and the cladding layer has low melting height and relatively high hardness,so grinding method is chosen to process the cladding layer.Taking W18Cr4 V cladding layer as the research object,the technological parameters of laser cladding W18Cr4 V were optimized.Grinding characteristics of W18Cr4 V cladding layer were studied by using cubic borax nitride wheel with resin and ceramic binder.Considering the machining quality and grinding power,the optimum machining parameters of W18Cr4 V cladding layer were determined.The main research contents of this paper are as follows:Optimization of process parameters of W18Cr4 V cladding layer.In this paper,the evaluation index after grinding was included into the process parameter optimization of laser cladding to obtain W18Cr4 V cladding suitable for grinding.The range analysis of the influence degree of laser cladding process parameters is carried out,and the grey correlation analysis is used to optimize the process parameters and verify the experiment.Finally,the laser cladding W18Cr4 V cladding layer with higher cladding efficiency,smaller aspect ratio and lower surface roughness after grinding was obtained.Research on grinding characteristics.The influence of grinding parameters and grinding wheel bond on unit width grinding force,grinding power and surface quality was studied.At the same time,the influence degree of three grinding characteristics was analyzed by range.The results show that the normal grinding force per unit width is greater than the tangential grinding force per unit width under the same machining conditions.The grinding force per unit width,grinding power and surface roughness obtained with ceramic binder are larger.Grinding depth and table feed speed are positively correlated with grinding force per unit width and surface mass,but negatively correlated with grinding specific energy.The linear speed of grinding wheel is the opposite.The grinding removal of W18Cr4 V cladding layer is mainly plastic removal with a small amount of brittleness removal.Grinding depth has the greatest influence on grinding force per unit width and grinding power,and the linear speed of grinding wheel has the greatest influence on surface roughness.Grinding process parameters optimization.In this paper,the surface roughness and grinding ratio energy were selected as the index,the entropy increase method was used to calculate the weight coefficient of each index,and the grinding process parameters were optimized by comprehensive scoring method,visual analysis method and range analysis.Finally,the grinding parameters of smaller specific energy and lower surface roughness during grinding were obtained.