【導讀】通過檢索、查閱相關(guān)文獻資料和設(shè)計手冊，了解沖壓工藝與模具設(shè)計內(nèi)容及方法；綜合運用所學知識進行沖壓件工藝性分析，制定合理的沖壓工藝方案和模具設(shè)計方案，并運用計算機完成繪圖和設(shè)計說明書撰寫。符合專業(yè)培養(yǎng)方向，同意。對模具的排樣做出了合理的布置，使材料利用率達到較高的水平。對模具的閉合高度進行了合理的確定，還設(shè)計出模具的主要零件落料凹模、落料拉深凸凹模、精整凹模等,以及合。沖壓所使用的模具稱為沖壓模具，簡稱沖模。冷沖模具是沖壓加工的主要工藝裝備，沖壓制件就是靠上、下模具的相對運動來完成的。1．工作零件凸凹模是直接使坯料成形的工作零件，因此，它是模具上的關(guān)鍵零件。凸凹模不但精密而且復雜，它應(yīng)滿足如下要求：。2．定位零件定位零件是確定坯件安裝位置的零件，有定位銷（板）、擋料銷（板）、導正銷、導料板、定距側(cè)刀、

　　

【正文】 ferred when the entire strip is shifted further in the work flow direction after the blanking operation. The length of the shift is equal to the center line spacing of the dies and it is also called the step width. Side shears, very precise feeding devices or pilot pins ensure feedrelated part accuracy. In the final production operation, the finished part, i. e. the last part in the sequence, is disconnected from the skeleton. A field of application for progressive blanking tools is, for example, in the production of metal rotors or stator blanks for electric motors . In progressive pound dies smaller formed parts are produced in several sequential operations. In contrast to progressive dies, not only blanking but also forming operations are performed. However, the workpiece also remains in the skeleton up to the last operation. Due to the height of the parts, the metal strip must be raised up, generally using lifting edges or similar lifting devices in order to allow the strip metal to be transported mechanically. Pressed metal parts which cannot be produced within a metal strip because of their geometrical dimensions are alternatively produced on transfer sets. Next to the dies already mentioned, a series of special dies are available for special individual applications. These dies are, as a rule, used separately. Special operations make it possible, however, for special dies to be integrated into an operational sequence. Thus, for example, in flanging dies several metal parts can be joined together positively through the bending of certain metal sections. During this operation reinforcing parts, glue or other ponents can be introduced. Other special dies locate special connecting elements directly into the press. Sorting and positioning elements, for example, bring stamping nuts synchronised with the press cycles into the correct position so that the punch heads can join them with the sheet metal part . If there is sufficient space available, forming and blanking operations can be carried out on the same die. Further examples include bending, collarforming, stamping, fine blanking, wobble blanking and welding operations . Die development Traditionally the business of die engineering has been influenced by the automotive industry. The following observations about the die development are mostly related to body panel die construction. Essential statements are, however, made in a fundamental context, so that they are applicable to all areas involved with the production of sheetmetal forming and blanking dies. Timing cycle for a mass produced car body panel Until the end of the 1980s some car models were still being produced for six to eight years more or less unchanged or in slightly modified form. Today, however, production time cycles are set for only five years or less . Following the new different model policy, the demands on die makers have also changed fundamentally. Comprehensive contracts of much greater scope such as Simultaneous Engineering (SE) contracts are being increasingly mon. As a result, the die maker is often involved at the initial development phase of the metal part as well as in the planning phase for the production process. Therefore, a much broader involvement is established well before the actual die development is initiated. Within the context of the production process for car body panels, only a minimal amount of time is allocated to allow for the manufacture of the dies. With large scale dies there is a runup period of about 10 months in which design and die tryout are included. In plex SE projects, which have to be pleted in to 2 years, parallel tasks must be carried out. Furthermore, additional resources must be providedbefore and after delivery of the dies. These short periods call for precise planning, specific knowhow, available capacity and the use of the latest technological and munications systems. The timetable shows the individual activities during the manufacturing of the dies for the production of the sheet metal parts . The time phases for large scale dies are more or less similar so that this timetable can be considered to be valid in general.Data record and part drawing The data record and the part drawing serve as the basis for all subsequent processing steps. They describe all the details of the parts to be produced. The information given in the part drawing includes: part identification, part numbering, sheet metal thickness, sheet metal quality, tolerances of the finished part etc. To avoid the production of physical models (master patterns), the CAD data should describe the geometry of the part pletely by means of line, surface or volume models. As a general rule, high quality surface data with a pletely filleted and closed surface geometry must be made available to all the participants in a project as early as possible.Process plan and draw development The process plan, which means the operational sequence to be followed in the production of the sheet metal ponent, is developed from the data record of the finished part . Already at this point in time, various boundary conditions must be taken into account: the sheet metal material, the press to be used, transfer of the parts into the press, the transportation of scrap materials, the undercuts as well as the sliding pin installations and their adjustment The draw development, . the puter aided design and layout of the blank holder area of the part in the first forming stage – if need be also the second stage , requires a process planner with considerable experience. In order to recognize and avoid problems in areas which are difficult to draw, it is necessary to manufacture a physical analysis model of the draw development. With this model, the forming conditions of the drawn part can be reviewed and final modifications introduced, which are eventually incorporated into the data record . This process is being replaced to