Study On The Precision Finishing Of Magnetic Abrasive Finishing On The Inner Surface Of 4×150mm Slender Pipe

With the rapid development in the field of machinery,petroleum and aerospace,higher requirements have been put forward on the precision machining of various parts.The role of pipe as a carrier is particularly important in these fields.Pipeline system is the lifeline of equipment.Due to the limitation of usage environment,many pipes are small diameter long pipe(inner diameter 2-6mm).Ordinary tools are hard to enter,and cannot be observed by naked eyes.Traditional polishing methods can hardly be completed.Therefore,it is necessary to find a suitable method to improve the light integrity of the inner surface of the small diameter pipe and enhance its transport performance.Magnetic Abrasive Finishing can effectively improve the surface quality of the workpiece.Compared with traditional methods,the technology has many advantages,such as high adaptability,self sharpening,small temperature rise and no need for tool compensation.It has been applied to all kinds of complex parts.When traditional magnetic abrasive finishing is applied to finish the inner surface of small diameter pipe,although it can achieve good results,it is difficult to guarantee the grinding efficiency due to the small machining area.Adding the radial magnetizing auxiliary magnetic pole inside the pipe can increase the magnetic induction intensity of the processing area,improve the grinding pressure,and thus improve the grinding efficiency.However,the roll performance of the magnetic particle brush decreases after adding auxiliary magnetic pole,and the surface of the micro surface is easily scratched after the grinding.In addition,when the pipe rotates at a high speed,the excessive auxiliary pole will break and damage under the action of centrifugal force.Based on the above problems,many groups of experiments have been carried out in this paper.The ultrasonic vibration assisted magnetic abrasive finishing technology is put forward.A self-designed experimental device is used to add axial ultrasonic vibration to the auxiliary pole.Meanwhile,the precise finishing experiment of the titanium alloy slender pipe is carried out.The size of the titanium alloy slender pipe is?4×150mm.The changes of the micro surface quality and the grinding efficiency were compared,and the effects of different vibration frequencies on the grinding effect were analyzed.In order to ensure high-speed rotation of pipes,a flexible magnetic pole chain consisting of a plurality of the ordinary radial poles is put forward.The flexible pole chain can restrain the magnetic abrasive flying phenomenon to a certain extent.By using Ansoft Maxwell software,the magnetic induction intensity of the processing area after adding flexible pole chain is analyzed,and the precise finishing experiment of the titanium alloy slender pipe is carried out.The size of the titanium alloy slender pipe is ?4×150mm.The process parameters are optimized based on the response surface method,and the processing uniformity of the micro surface after processing is analyzed.Finally,under the same process conditions,a plurality of spherical poles are used to replace the ordinary radial poles,and the precise finishing experiment of the titanium alloy slender pipe is carried out.The size of the titanium alloy slender pipe is ?4×150mm.By using Ansoft Maxwell software,the magnetic induction intensity of the processing area after adding flexible pole chain is analyzed,and the influence of the rotation speed of the pipe on the grinding effect is analyzed.