内置液性塑料式小径磁力滚压刀具研究  

Built-in liquid plastic small diameter magnetic rolling tool

作　　者：梁星 姚新改 李昂 LIANG Xing;YAO Xin-gai;LI Ang(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Precision Machining Key Laboratory of Shanxi Province,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]精密加工山西省重点实验室,山西太原030024

出　　处：《机电工程》2020年第5期537-541,共5页Journal of Mechanical & Electrical Engineering

基　　金：山西省应用基础研究资助项目(201701D121074)。

摘　　要：针对磁力滚压过程中载荷多变、接触应力不均的问题,对磁力滚压机理进行了理论分析,依据液性塑料的不可压缩性、均匀传压的特点研发了一套新型刀具。基于Ansoft对系统磁路进行了有限元仿真,确定了磁力滚压刀具的磁力线分布与单磁极平均径向磁力,结合ANSYS Workbench静态场仿真,验证了刀具结构的合理性;利用Fluent对液性塑料在预应力与载荷变化工况下进行了数值模拟,分析得出了液性塑料的引入能使各滚珠滚压力在滚压过程中保持均匀分布,当工况变化时,在0.008 s的时间内即可完成均匀传压;最后对新刀具的加工性能进行了试验验证。研究结果表明:采用内置液性塑料磁力滚压刀具加工,可使不锈钢管内壁R_a由0.828降低到0.187,粗糙度值与周向残余应力分布趋于均匀;该结果对提高长不锈钢管内表面加工质量有积极意义。Aiming at the problem of variable load and uneven contact stress during the magnetic rolling process, the theoretical analysis of the magnetic rolling mechanism was carried out. According to the incompressibility of liquid plastics, a new set of cutter was developed with the characteristics of uniform pressure transfer. Based on the finite element simulation of the system magnetic circuit, the distribution of magnetic force line and the average radial magnetic force of single magnetic pole of the magnetic rolling tool were determined based on Ansoft, and the rationality of the tool structure was verified by combining with the static field simulation of ANSYS Workbench. Fluent was used to conduct numerical simulation of liquid plastics under the conditions of prestress and load variation, and the analysis showed that the introduction of liquid plastics could make the rolling pressure of each ball evenly distributed in the rolling process. When working conditions changed, the uniform pressure transfer was completed within 0.008 seconds. The processing performance of the new cutter was tested and verified. The results show that the built-in hydraulic plastic magnetic rolling tool reduces R_a in stainless steel pipe from 0.828 to 0.187, and the roughness value and circumferential residual stress distribution tend to be uniform, which is of positive significance to improve the surface quality of long stainless steel tubes.

关 键 词：液性塑料 均匀传压 小径 磁力滚压刀具 

分 类 号：TH122[机械工程—机械设计及理论] TG729[金属学及工艺—刀具与模具]