Finite Element Analysis And Parameter Optimization Of NC Turning Titanium Alloy

Because of its own good characteristics,Titanium alloy gradually gets people’s attention,is applied in more and more areas.Because of its own characteristics,its processing has a certain degree of difficulty,and it has brought great difficulties for the cutting.So it needs to be a certain analysis of its cutting process.While processing,selecting cutting parameters is a difficulty.For the present situation,most of the processing of materials are used to querying the cutting manual to determine the cutting parameters.Using experience to determine cutting parameters,it can not be met by efficient and economical goals which society needs.So,there is the need for a certain cutting parameters optimization.At the same time,in the actual CNC machining,it must analyze the cutting parameters which the CNC machine makes.So,it should confirm whether it is the optimal cutting parameters at this time turning.Therefore,based on the above view,the following efforts were made:(1)The DEFORM software was used to simulate the turning process of titanium alloy Ti-6Al-4V.In the simulation process,the cutting force and the cutting temperature are simulated and analyzed respectively by cutting speed,feed rate and cutting depth as the single variable.According to the simulation results,the cutting speed increases in the 100-200 m / min,so the cutting force and cutting temperature increase,too;When the feed rate is increased in the range of 0.1-0.5 mm / rev during cutting,the cutting force increases greatly and the cutting temperature reaches the peak at the feed rate of 0.3 mm / rev and then decreases;With cutting depth of 0.25-1.25 mm increasing,the cutting force and cutting temperature also significantly increases;And the effect of the feed rate and the cutting depth on the cutting force is greater than the cutting speed.The cutting speed has a great influence on the cutting temperature,feed and cutting depth of its impact is not great.(2)The genetic algorithm is used to optimize the cutting parameters.In the selection of the objective function,the processing efficiency,processing costs and material removal rate are selected as the objective function.And through the analysis of the multi-objective function processing method,the combination weighting coefficient method is finally determined,in this way the objective function has been dealt with.The above multi-objective function,eventually converted into a single objective function,so that the optimization process becomes simple.In this paper,various constraints are considered.This includes machine constraints,tool constraints,workpiece quality constraints,and processing conditions,and so on.There are many ways to deal with constraint functions.In this study,the current popular penalty function is used to deal with it.By this method,he objective function could be converted to an unconstrained single objective function.And then use the genetic algorithm to optimize the cutting parameters of the cutting process example which has been proposed.And by this method,a better cutting parameter than the experience value can be obtained.And finally prove the effect of algorithm optimization,this method can play a certain role in guiding the practice.This method has a greater influence on the company’s economy.(3)After the cutting parameters are optimized,in this paper,the NC machine tool in the preparation of the program carried out a certain analysis.The single cutting is analyzed in the CNC machine tool,by extracting the block of the cutting.By using the C++ software,the relevant parameters in the S and F function words are extracted from the block of a single pass.And then use the formula to change it into the processing of the cutting speed and feed.And then use the genetic algorithm to optimize.The empirical value of the cutting speed of 125.6 m / min and the feed rate of 0.10 mm / rev is optimized for the cutting speed of 130.4 m / min.The feed rate is 0.16 mm / rev.Use the optimized cutting parameters to modify the original NC program block.Use the new block to process workpieces.So by this method the optimization process for a single cutting has been completed.The finite element simulation analysis of titanium alloy Ti-6Al-4V was carried out.The influence of cutting parameters on cutting force and cutting temperature was studied.The optimization of cutting parameters of titanium alloy can improve the difficulty of processing titanium alloy in a certain sense.