材料成型及控制工程毕业论文中英文资料外文翻译文献1.doc

毕业设计(论文)外文翻译 学院： 机械与车辆工程学院 院系： 材料成型及其控制工程 Improving Performance of Progressive Dies Progressive die stamping is a cost-effective and safe method of producing components. Careful design and construction of dies will ensure optimum performance. A progressive die performs a series of fundamental sheet metal operations at two or more stations in the die during each press stroke. These simultaneous operations produce a part from a strip of material that moves through the die. Each working station performs one or more die operations, but the strip must move from the first station through each succeeding station to produce a complete part. Carriers, consisting of one or more strips of material left between the parts, provide movement of the parts from one die station to the next. These carrier strips are separated from the parts in the last die station. There are six elements that should be addressed when designing and building a progressive die to maximize its performance: Interpreting the part print, Starting material into the die, Part lifters and part feeding, Flexible part carriers, Upper pressure pads, and Drawn shells. Interpreting the Part Print The first step in the proper design of a progressive die is to correctly analyze the part print. The tool designer must interpret the print to determine the function of the part by looking for such things as the type of material, critical surfaces, hole size and location, burr location, grain direction requirements, surface finish and other factors. The die designer must understand the part well, particularly if it has irregular shapes and contours. However, modern computer-drawn prints make this more difficult because computer-drawn part data can be downloaded directly to the die-design computer. As a result, the designer may not become thoroughly familiar with important part features. Also, many computer-drawn parts are more difficult to understand,