Shortening the planning cycle and improving planning quality are one of the key factors in shortening the overall mold development cycle.
　　 The modularization plan of plastic products is to use the similarity in structure and function of commodity parts, and to standardize and combine the finished products.
　　 Many practices indicate that modular planning can be useful to reduce commodity planning time and improve planning quality. This article therefore explores the useof modular planning approaches in mold planning.
　　 The module library has three processes: module differentiation, structural feature model, and user self-defined feature generation.
　　 The specification part is a special case of the module, which exists in the module library. The definition of the specification part only needs to carry out the latter two processes. The module division is the first step of the modular planning. The module differentiation is reasonable and directly affects the function of the modular system. Utility and cost.
　　 The module distinction of each type of commodity must be tested by skills and repeated proofs to obtain a distinction. For plastic products, the functional modules and structural modules are mutually tolerant.
　　 The structural module can have a large structural change in a part of the range, so that it can include a utility module; and the partial structure of the utility module can be relatively fixed, so that it can include the structural module.
　　 After the completion of the planning of the plastic product module, the feature model of the required module is constructed in the Pro/E Part/Assembly space, and the Pro/E user self-defined feature function is used. Variable parameters: Variable scales are linked to installations to form User-Defined Features (UDFs).
　　 Generate a user-defined feature file (a file with a suffix of gph) and store it by grouping skills, that is, complete the establishment of the module library.
　　 The system undergoes two inferences, structural selection reasoning and active modeling of the module, and the conclusion of the module is completed.
　　 The first reasoning gives the general structure of the module, and the second reasoning finally determines all the parameters of the module. After this path, the module "plasticity" policy is completed.
　　 In the structure selection reasoning, the system bears the module title, function parameter and structure parameter input by the user, makes the reasoning, and obtains the title of the applicable module in the module library.
　　 If you are not satisfied with the result, the user can specify the module title. The module obtained in this step is still fixed, it lacks the definition of scale parameters, accuracy, data characteristics and installation links.
　　 In the active modeling reasoning, the system uses the input scale parameters, precision features, data features and installation contact theory to drive the user self-defined feature model, dynamically and actively construct the module feature model and actively install it.
　　 The active modeling function was developed using C language and Pro/E's secondary development tool Pro/TOOLKIT. After the module is called, the mold planning can be completed quickly. After using this system, the mold planning cycle is shortened significantly.
　　 Since the quality of the module is carefully considered during the planning of the plastic product module, the quality of the plastic product is guaranteed to be effective, and the UDFs file is registered in the module library, so the system is scalable.