Reduction of Friction and Calibration Pressure by Section Preformduring Hydroforming of Tubular Automotive Structural Components
In the past decade,hydroformed structural components have been widely used in industrialareas in North American and Europe and there is a large potential market in Asia with thedevelopment of automotive industry.An extraordinary feature of tube hydroforming is that a hollowcomponent with a three dimension axis and variable closed-sections can be integrally formed,so thatthe number of component parts is minimized,weight is reduced and stiffness of the part is increased.The section shapes in many automotive hollow components are complex and it is usually difficult orimpossible to hydroform these typical sections directly from circular section tube,so that satisfactorypreforms are necessary.In this paper,a method to reduce the friction and calibration pressure througha petal-like cross-section shape preform is presented and its mechanism is analyzed.Preforms forrectangular,trapezoidal and polygonal sections used in hollow components are investigated andsatisfactory preforms are obtained.Taking an engine cradle as example,satisfactory preform sectionshapes have been designed,by which the thickness distribution was controlled and the flash generatedfrom the die-parting surface in the final forming was avoided.So a carefully selected preform processcan contribute significantly to the reduction of friction and calibration pressure and it is a dominantfactor for successful hydroforming.
Internal high pressure forming hydroforming automotive structural component
C.Han S.J.Yuan L.N.Sun
School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China School of Mechanical Engineering,Harbin Institute of Technology,Harbin 150001,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）