冲压成型--把手连接件级进模设计外文翻译.doc

毕业设计 外文文献翻译题 目（中文） 冲压成型 （英文） Stamping becomes typ 学生姓名 张皓 目录1.冲压成型 作者: STEPHENS2.材料特性 作者：MARK JAFEStamping becomes typThe confidence level in successfully forming a sheetmetal stamping increases as the simplicity of the part’s topography increases. The goal of forming with stamping technologies is to produce stampings with complex geometric surfaces that are dimensionally accurate and repeatable with a certain strain distribution, yet free from wrinkles and splits. Stampings have one or more forming modes that create the desired geometries. These modes are bending, stretch forming and drawing. Stretching the sheetmetal forms depressions or embossments. Drawing compresses material circumferentially to create stampings such as beer cans.As the surfaces of the stamping become more complex, more than one mode of forming will be required. In fact, many stampings have bend, stretch and draw features produced in the form die. The common types of dies that shape material are solid form, stretch form and draw.Solid FormThe most basic type of die used to shape material is the solid form die. This tool simply displaces material via a solid punch “crashing” the material into a solid die steel on the press downstroke. The result is a stamping with uncontrolled material flow in terms of strain distribution. Since “loose metal” is present on the stamping, caused by uncontrolled material flow, the part tends to be dimensionally and structurally unstable.Stretch FormForming operations that provide for material flow control do so with a blankholder. The blankholder is a pressurized device that is guided and retained within the die set. Stampings formed with a blankholder may be described as having three parts, shown in Fig. 1. They are the product surface(shown in red), blankholder surface (flat area shown in blue) and a wall that bridges the tw