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    of the solid-modeling functions in a PC-based CAD/CAM
    system. With the increased availability of sophisticated,
    low-cost software for Windows, more and more engineersare using PC applications to get their jobs done. Thus the
    development of a new mold design application based on the
    Windows platforms is in high demand.
    High-end users are finding that mid-range solid modelers,
    such as SolidWorks, have met their needs. Developed from
    the beginning as a native Windows application, SolidWorks
    is one of the 3D mechanical design softwares for Win-
    dows. Its unique combination of production-level power,
    ease-of-use, and affordability is unmatched. SolidWorks
    99, the seventh major release of the company’s mechan-
    ical design software for Windows NT, Windows 98 and
    beyond provides an increased power and functionality in a
    fully integrated solid modeler. Familiar conventions such as
    point-and-click, drag-and-drop, cut-and-paste, and seamless
    data sharing with other Windows software lead to produc-
    tivity gains. The ease-of-use without extensive training and
    at affordable pricing enables companies to install the sys-
    tem on every engineer’s desktop. One of its applications is
    for mold design in the plastics industry. This latest appli-
    cation technology has added an entirely new dimension to
    the mold design process.
    2. Injection mold design
    Injection molding uses temperature-dependent changes in
    material properties to obtain the final shapes of discrete
    parts to finish or near-finish dimensions through the use of
    molds. In this type of manufacturing process, liquid material
    is forced to fill and solidify inside the cavity of the mold [2].
    Firstly, the creation of a mold model requires a design
    model and a containing box. The design model represents
    the finished product, whereas the containing box represents
    the overall volume of the mold components.Injectionmold design involves extensive empirical knowl-
    edge (heuristic knowledge) about the structure and the func-
    tions of the components of the mold. The typical process
    of a new mold development can be organized into four ma-
    jor phases: product design, moldability assessment, detailed
    part design, insert/cavity design, and detailed mold design.
    In Phase 0, a product concept is pulled together by a
    few people (usually a combination of marketing and engi-
    neering). The primary focus of Phase 0 is to analyze the
    market opportunity and strategic fit. In Phase I the typical
    process-related manufacturing information is then added
    to the design to produce a detailed geometry. The concep-
    tual design is transformed into a manufacturable one by
    using appropriate manufacturing information. In Phase II
    the parting direction and parting lines location are added to
    inspect the moldability. Otherwise, the part shape is again
    modified. In Phase III, the part geometry is used to establish
    the shape of the mold core and cavity that will be used to
    form the part. Generally shrinkage and expansions need to
    be considered so that the molding will be the correct size
    and shape at the processing temperature. Gates, runners,
    overflows, and vents also need to be added. The association
    between geometric data and parting information is critical
    at this point. Phase IV is related to the overall mechanical
    structure of the mold including the connection of the mold
    to the injection machine, a mechanisms for filling, cooling,
    and for ejection and mold assembly.
    3. Methodology
    For the reasons described above, SolidWorks 99 has been
    used as the platform for the new mold design application.
    Fig. 1 shows a Windows-native 3D injection mold design三文实体建模革命设计已经占主流了。然而高端的3D实体造模系统已经在大型的航空航天,消费产品和汽车公司等工程领域应用了多年,许许多多的小公司现在正在实现从工作站到PC的转变。转变的原因之一就是,Windows-native/NT的灵活性和先进性让软件开发者能创建许多易于使用的应用程序。高端用户正在使用中档的实体建模程序,比方说,Solidworks,已经满足了他们的需要。
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