小径不锈钢管内壁磁性珩磨磨具研发及试验研究

Development and experimental research of grinding tool for magnetic honing inner wall of small diameter stainless steel tube

为满足客户对Ф19～30 mm小径不锈钢管内表面粗糙度值小于0. 5μm的加工要求,研发了一套新型转子磨具。对磨具进行结构设计,利用Ansoft软件对该磨具及其实验装置进行二维磁场分析,得到其磁场分布、珩磨压力和切削力矩等理论参数,验证方案可行性;进行磁性珩磨加工试验,工件内表面平均粗糙度值由0. 866μm降低到0. 474μm,验证了该磨具能够进行稳定加工且具有较好的磨削性能。该磨具的研发拓展了磁性珩磨的应用范围,为后续研究提供了理论依据和实验基础。

Magnetic honing technology is a new technology which uses magnetic force to drive the rotor abrasive to grind the inner wall of long straight stainless steel tube. It can effectively and cleanly remove the oxide skin on the inner surface of stainless steel pipe with inner diameter greater than 76mm, and reduce the roughness of the inner surface. In order to meet the customers' need that the inner surface roughness of small-diameter stainless steel tubes with diameters of 19 mm to 30 mm be machined is less than 0. 5μm, a new type of rotor grinding tool has been developed. The structure of the abrasive tool is designed, and then the two-dimensional magnetic field of the abrasive tool and its experimental device were ana-lyzed by Ansoft software, and the theoretical parameters such as magnetic force line and magnetic induc-tion intensity distribution, honing pressure and cutting torque were obtained, and the feasibility of the scheme is verified. The magnetic honing test was carried out, and the average roughness of the inner sur-face of the workpiece was reduced from 0. 866μm to 0. 474 μm, it is verified that the rotor grinding tool can work steadily for a long time and has good grinding performance. The research and development of the grinding tool expands the application scope of magnetic honing, and provides theoretical data for subsequent research.