摘要
利用液压复合成形技术,对数控铣削加工三通件进行工艺改进,针对充液拉深和内高压胀形阶段建立了力学模型,分析了摩擦系数、拉深比、压边力和胀形力等工艺参数对零件成形的影响.通过对液室压力的数值模拟,得到在40 MPa液压下,充液拉深后零件的壁厚减薄率最小,为27.5%,壁厚最薄处位于凸模圆角区域;并通过液压复合成形工艺,试制出内径为SR90 mm的三通件,成形的三通件翻边处最小壁厚为1.59 mm,通过了液压强度、气密性能等可靠性考核,实现了1Cr18Ni9Ti不锈钢球形三通件的整体成形.研究表明,采用液压复合成形技术,三通件的研制周期缩短了8天,材料利用率提高了60%以上.
The technology improvement of tee part produced by CNC milling was conducted by hydraulic compound forming technology. Then,the mechanical models of hydromechanical deep drawing and internal high pressure bulging were established,and the influences of friction coefficient,drawing ratio,blank holder force and bulging force, etc. on the forming of part were analyzed. When the hydraulic pressure increased to 40 MPa,the thinning rate of wall thickness after hydromechanical deep drawing was the minimum of 27.5% at the punch corner by the numerical simulation of hydraulic pressure. Furthermore,the tee part with a inner diameter of SR90 mm was formed by hydraulic compound forming technology,and the minimum wall thickness in the flange of forming tee part was 1.59 mm. Thus,the in-tegral forming of spherical tee part of stainless steel 1Cr18Ni9Ti was realized by assessing the reliability of hydraulic strength and air tight-ness. The results show that the hydraulic compound forming technology reduces the production cycle of tee part for eight days,and the ma-terial utilization is improved up to 60%.
出处
《锻压技术》
CAS
CSCD
北大核心
2018年第1期72-77,共6页
Forging & Stamping Technology
基金
上海航天局型号工艺攻关项目(716A-YZ)
关键词
液压复合成形
三通件
液室压力
充液拉深
内高压胀形
hydraulic compound forming
tee part
hydraulic pressure
hydromechanical deep drawing
internal high pressure bulging
