Study On Numerical Simulation And Technology Of Multi-direction Hammering Incremental Forming

In this paper,a new method for realizing multi-direction hammering progressive forming is proposed,and the feasibility of the method is verified by experiments.The method realizes the change of the hammering direction on the basis of the existing hammering progressive forming,and does not need to change the processing equipment,and only needs to change the trajectory of the forming tool head to realize the multi-direction hammering progressive forming.Combined with numerical simulation and experimental method,the deformation characteristics of multi-direction hammer-type progressive forming of 30 degrees,45 degrees,60 degrees,90 degrees and 120 degrees hammering angles were studied.Related basic issues were systematically studied.The results of numerical simulation in incrementally that the equivalent stress distribution is different in the range of hammer angle,and the size of the forming force decreases with the increase of hammer angle,the main strain of different hammer angle and strain states are close to.When the hammering angle is 90 degrees,the thickness change follows the sine law,and the average thickness of other hammer angles is smaller than the hammering angle.Through experimental study on process parameters of multi-directional hammer type progressive influence,forming performance results show that the angle of attack is proportional to the performance with the hammer sheet forming,and sheet thickness is proportional,and inversely proportional to the wavelength,and is inversely proportional to the amplitude is proportional to the amount of feed layer,and the feed speed is inversely proportional to.But hammer angle will make the spring back is too large,affecting the accuracy of sheet forming;sheet thickness will increase the cost;process parameters of wavelength,amplitude,layer feed and speed is too small will lead to increased processing time,reduced work efficiency.Comprehensive analysis of the experimental results of five groups of experiments,the best forming process parameters of sheet metal are: thickness of 1 mm,wavelength of0.5mm,amplitude of 0.6mm,feed rate of 0.2mm,feed speed 300mm/min.We can seethat in a certain range of angle of attack by hammer experiment,increasing hammer angle can improve the forming performance of sheet metal,consistent with the results of numerical simulation and experimental results show that the hammer angle for the forming performance of sheet metal is preferably 120 degrees.Measurement of two kinds of experimental methods to study the multi hammering incremental forming variation of the forming accuracy of manual measurement and Geomagic Qualify software,the results show that different hammer angle incremental forming of sheet forming precision has certain effect on certain hammer angle variation range,and then decreased with increase of the sheet the forming accuracy decreased after hammer angle is 45 degrees,the maximum deviation value is measured,the hammer angle forming precision is the lowest,with the increase of hammer angle,measuring the deviation value decreased gradually,forming precision is gradually increased,when the hammer angle is 90 degrees,The best precision forming.In this paper,the new method of multi-direction hammering progressive forming is a new idea and direction in the field of progressive forming.The change of hammer angle can achieve the effect of improving the forming performance of sheet metal parts.Processing and personalized application requirements are very helpful,can be flexible sheet metal processing technology to develop new ways to achieve and processing methods.