Study On Magnetic Abrasive Finishing Of Space Elbow Based On Center Line Reconstruction Method

With the development of modern science and technology,space bend pipe is widely used in machinery industry,defense industry,high technology,and others equipment,especially in high precision fields such as aerospace and automobile engines,not only the elbow components are required to have good quality,and the smoothness of the inner surface of the elbow component is very high.However,due to the compact space structure of the engine,the spatial structure of the elbow pipe in the engine presents irregular geometric characteristics,which makes it difficult to polish the inner surface of the elbow pipe,especially the surface quality of the elbow is difficult to be guaranteed.In this study,the centerline reconstruction method is applied to the magnetic abrasive finishing(MAF)of the irregular space bend pipe curved inner surface.it realizes the recognition of finishing path?At the same time,the axial feed speed is optimized at the bend,and the uniformity of the finishing quality of the inner surface of the space bend pipe is controlled.This paper introduces a space bending pipe of the magnetic grinding device based on the(KUKA KR16)six-degrees-of-freedom manipulator,it analyzes the stress conditions of magnetic abrasive particles(MAPs),and describes the material removal mechanism of MAF;it uses a three-axis coordinate measuring machine to collect data.The coordinate data of the three point cloud curves on the outer contour of the space elbow,through the processing of Gaussian filtering on the three point cloud curves,generates the outer contour of the elbow,and then reconstructs the irregular geometric centerline,and then passes through the irregular geometry.The coordinates of the points on the center line are transformed in a homogeneous manner,and the grinding trajectory of the bent pipe is calculated and optimized.At the same time,in order to solve the problem that it is difficult to determine the feed speed of the grinding at the bend of the space bend pipe under different curvatures,it is proposed to use the speed compensation method to accurately determine the feed speed parameters of the reciprocating motion of the bent pipe bend.When processing the space elbow,the magnetic grinding device reciprocates along the reconstructed elbow centerline at an optimized feed rate,and the magnetic pole drives the magnetic abrasive grains to perform a complex motion of rotation and a straight line so that the magnetic particles are inside the elbow.Spiral motion is performed to achieve uniform control of the quality of the inner surface of the curved pipe.Finally,a reproducibility test of titanium alloy space bent magnetic grain grinding was conducted to verify the effectiveness of the centerline reconstruction method and thebending velocity compensation method in path identification and quality uniformity control in the space bending magnetic grinding process.And feasibility.