Study On Chip Control And Surface Roughness Of Low Feed Grooving

The “made in China 2025” plan brings higher requirements to the development of the manufacturing industry,and metal cutting is one of the most important methods in the manufacturing process of parts.As a common metal cutting process,grooving is widely used in the machining of slot or cutting off of the parts.However,due to its poor adjustability,low heat transfer,and unstable machining process,it was mainly used in the rough machining of parts.In recent years,the industrial requirements for the machining accuracy and efficiency of parts are constantly improving.In addition,the application of CNC precision automatic lathe has become more widespread.The past grooving process has been unable to meet the existing industrial requirements.Reducing the feed rate of the groove is an effective way to improve the dimensional accuracy and surface quality of the machined parts,but it will also lead to chip breaking difficulties and size effects in the process.Therefore,it is necessary to analyze the chip and surface roughness of the groove and explore the influence of tool parameters and feed rate on the groove.In this paper,three kinds of common grooving tools are investigated and optimized,and their main geometric parameters are measured respectively.A series of low feed grooving experiments are designed according to the tool parameters and the characteristics of the workpiece and machine tool.Collect the experimental chips and broken workpieces,and the data of the curl radius,the cross-section shape of the chips and the roughness of the machined surface have been collected.Based on the principle of material mechanics,combined with the relevant theoretical model of chip curl radius in metal cutting principle,the influence of chip wrapping on the bending stiffness of chip is introduced into the model,and a new theoretical model of chip curl radius suitable for groove machining has been proposed.Combined with the existing roughness theory model,the influence of the wiper on the machined surface has been analyzed.The critical feed rate of three kinds of tools has been obtained,and the error sources between the theoretical model and the actual results have been explored.Chip and processed surface morphology have been used as evaluation indicators,combined with the theoretical model and the experimental results,the actual influence of the tool parameters and process parameters on the grooving has been analyzed,and this paper has optimized the reasonable matching relationship between the tool parameters and process parameters.