1、（外文翻译） 1 毕 业 设 计（论 文） 英英 文文 翻翻 译译 课题名称 基于 UG 的高顶盖后板修边模参数化设计 系 部 专 业 班 级 学 号 姓 名 指导教师 （外文翻译） 2 4 Sheet metal forming and blanking 4.1 Principles of die manufacture 4.1.1 Classification of dies In metalforming,the geometry of the workpiece is established entirely or partially by the geometry of the di
2、e.In contrast to machining processes,ignificantly greater forces are necessary in forming.Due to the complexity of the parts,forming is often not carried out in a single operation.Depending on the geometry of the part,production is carried out in several operational steps via one or several producti
3、on processes such as forming or blanking.One operation can also include several processes simultaneously(cf.Sect.2.1.4). During the design phase,the necessary manufacturing methods as well as the sequence and number of production steps are established in a processing plan(Fig.4.1.1).In this plan,the
4、 availability of machines,the planned production volumes of the part and other boundary conditions are taken into account. The aim is to minimize the number of dies to be used while keeping up a high level of operational reliability.The parts are greatly simplified right from their design stage by c
5、lose collaboration between the Part Design and Production Departments in order to enable several forming and related blanking processes to be carried out in one forming station. Obviously,the more operations which are integrated into a single die,the more complex the structure of the die becomes.The
6、 consequences are higher costs,a decrease in output and a lower reliability. Fig.4.1.1 Production steps for the manufacture of an oil sump （外文翻译） 3 Types of dies The type of die and the closely related transportation of the part between dies is determined in accordance with the forming procedure,the size of the part in question and the production volume of parts to be produced. The production of large sheet metal parts is carried out almost exclusively using single sets of dies.Typi
