Study On Vibration In Chip Control

Vibration is inevitable in cutting process.Vibration will bring a lot of harm to the processing quality of workpieces and machine tools and tools.At present,the research on vibration in cutting mainly focuses on the mechanism of vibration,influencing factors,detection,prevention and control.However,in terms of the influence factors of vibration,the current research mainly focuses on cutting parameters,workpiece and tool materials.As a structure of cutting tool to chip control,chip breaking groove has a great influence on the cutting forces and cutting heat of the cutting tool in the cutting process,and it can affect the vibration of the tool.However,there are few studies on the influence of chip breaking grooves on tool vibration.A cutting simulation model that carbide YG8 tool cutting titanium alloy Ti6Al4 V was established by ABAQUS finite element simulation software.Through the analysis of the cutting force fluctuations indirectly reflect the vibration of the tool,so as to study the influence of chip breaking groove on tool vibration.Firstly,by controlling the same cutting parameters,the influence of different groove structure on tool vibration was studied in each stage of chip crimping control.The results showed that the groove structure had no obvious effect on the vibration frequency of the tool in each stage of the chip flow through the chip breaking groove;at the stage from the beginning of the chip into the chip breaking groove to the beginning of the chip into the chip breaking groove,the amplitude of the trapezoidal chip breaking groove tool was the smallest in all directions,and the amplitude of the straight-arc chip breaking groove tool was the largest in all directions;In the phase of chip flow through the bottom of the groove,the amplitude of the cutter in the straight-arc chip breaking groove was the smallest in all directions,and the trapezoidal chip breaking groove tool was the largest;In the phase of chip flow through the back of the groove,the amplitude of the double trapezoidal chip break groove tool was the smallest in all directions,and the amplitude of the trapezoidal chip break groove tool was the largest in general.After comparison,it is found that the overall amplitude of the trapezoidal chip break groove was larger than the other two chip break grooves.As trapezoidal chip breaking groove is a common chip breaking groove in production,and in order to reduce its influence on tool vibration,the influence of trapezoidal chip breaking groove parameters on the tool in the process of controlling chip crimp was studied.By the single-factor method,because of the changing of other parameters with changing of depth and maximum groove width of chip breaking groove,only four parameters,namely land width,minimum groove width,front angle and anti-chip angle were studied.The results showed that with the increase of the minimum groove width,the amplitude of the tool in each stage along all directions became larger;with the increase of the front Angle,the amplitude of the tool in all directions at each stage became smaller;with the increase of the anti-chip angle,the amplitude of the tool along the main motion direction and the feed direction had no obvious change at each stage,while the vibration along the cutting depth direction gradually decreased;with the increase of edge bandwidth,the amplitude of the tool along the main direction of motion and the feed direction gradually became larger in the stage before the chip began to flow into the chip breaking groove to began to flow into the bottom of the groove.At the stage when the chip flowed through the bottom of the groove,the amplitude of the tool along the main direction of motion and the feed direction became smaller.However,the amplitude along the feed direction became larger,and there was no obvious regular change in the back force in all stages of controlling chip crimpling.In order to optimize the above four parameters of the trapezoidal chip breaking groove,the orthogonal test was designed.Range analysis,ANOVA and brainstorm optimization algorithms were used for optimization.Firstly,the range analysis and variance analysis of the test results were carried out to determine the priorities of each index and each factor,and through the significance test,the significance of each factor was determined.After comprehensively considering the amplitude,significance and priorities of each index,range analysis and variance analysis,the same results of optimal portfolio was obtained.Then,the quadratic regression fitting model between the four parameters and the maximum amplitude of cutting force in three directions was established.The weight of the three indexes was determined by the significance test results and AHP multi-hierarchy analysis method,and the optimization model was established by linear weighting method.By comparing the optimization results of range analysis,variance analysis and brain storm optimization algorithm,the edge bandwidth was 0.1mm,the minimum groove width was 0.2mm,the front Angle was29.77°,the chip Angle was 38.96°,and the comprehensive vibration of the tool is the smallest.