Study Of NC Short Arc Milling Tool Wear Law

Short arc machining technology uses positive polarity non-contact pulse discharge to remove the workpiece,compared with the advantages of machining more obvious,especially for high hardness,high strength,high brittleness,high hardness of the conductive material,processing efficiency is ideal.Relative to the field of electrical processing EDM technology,short arc off disadvantages for the benefit of the spark to avoid the use of arc discharge,the workpiece erosion processing.Its processing efficiency is much higher than the spark,and in the large cement roll,mill roll,large engine casing processing effect is excellent.In this paper,the electrode loss law in the process of short arc machining is analyzed,summarized and verified experimentally.The nickel-based superalloy was processed by a new type of NC short arc milling machine.Experiments show that the difference in electrical parameters,the difference between the electrode material,and the difference in electrode shape have different effects on the relative electrode losses.In the experiment,several kinds of electrodes commonly used in the process of short arc milling were analyzed.It was found that the same electrical parameters and other processing conditions were used.The relative loss of graphite electrode was the smallest,and then the carbon steel was larger than that of copper.The same electrode material,in other conditions are the same,different electrical parameters of the case,the electrode loss is different.With the increase of the voltage,the relative loss of the electrode decreases with the increase of the duty ratio.With the increase of the frequency,the relative loss of the electrode increases.The study found that the use of appropriate electrode materials and reasonable processing of electrical parameters to reduce the electrode loss has a significant effect.On the basis of the gray theory,the parameters of the process in the short arc machining are quantified by the optimization experiment of the multi-objective process parameters.The experimental data are obtained by orthogonal experiment,and three evaluation indexes are designed respectively.Material erosion rate,relative electrode loss,and surface roughness.Through the dimensionality of the original data,the gray correlation degree of the three indexes of each experiment is obtained.And finally a group with the highest degree of gray correlation is the optimal combination of experiments.In the single factor experiment,the influence of the variable factors on the relative loss of the electrode in the process is verified.The experimental results show that the theoretical analysis is in agreement with the experimental results.