Study of process of removing burrs from group holes in TC4 titanium alloy plate by non-synchronous rotation

Abstract

Abstract It is very important to remove the entrance and exit burrs of group holes in TC4 titanium alloy plate. In order to improve the efficiency, a novel method of removing burrs by non-synchronous rotation of opposite rotating magnetic pole is proposed by magnetic abrasive finishing (MAF). The influence of force change on the abrasive particles, magnetic field intensity and magnetic field gradient on the burrs removal under the relative rotation angle were studied. Meanwhile, the parameters are optimized through the experiment of non-synchronous rotation, which are magnetic pole speed, abrasive particle size and abrasive filling amount by response surface methodology (RSM). By using the method of non-synchronous rotation, the constant magnetic field distribution is improved, and the renewal of the cutting edge of magnetic abrasive particles is accelerated. Based on the investigation of rotating grinding of opposite four magnetic poles, when the rotation speed of magnetic pole I is 600r/min, the best process parameters are obtained as follows: the rotating speed of magnetic pole II is 800 r/min, and the particle size is 250 µm, abrasive filling amount is 30g. The exit burrs height decreased from 200.4 µm to 14.5 µm by 92.7%, and the entrance burrs height decreased from 180.5 µm to 10.5 µm by 94.2%. The analysis of the experiment results shows that the relative speed of the magnetic pole is faster, the splashing of abrasive particles is easier, and the lower the grinding efficiency. On the contrary, if the relative speed is smaller, the burrs removal will be more difficult. However, the impact of size of abrasive particles and the amount of abrasive filling on the burrs height is insignificant. In the process of non-synchronous rotation grinding, the entrance and exit burrs are removed at the same time, so the removal amount is greatly increased, and the grinding efficiency is improved. According to numerical simulation and experimental analysis, non-synchronous rotation grinding technology is verified, which provides a theoretical basis for the burrs removal technology.