Injection Molding Design Guidelines Polymer （注塑设计指南聚合物）.pdf

Injection Molding Design Guidelines /resins/include/mainmenu_xml.inc /resins/include/techsolution_xml.inc /resins/include/rate_xml.inc Technical Research Design Guides Injection Molding Design A successful application of an engineering thermoplastic requires more than identifying a specific product or grade. Three areas – design, product, process – are all interrelated and the appropriate rules in each area must be followed to ensure a successful application. In most cases, the process must be determined before a specific resin grade can be selected. During this review, designers also need to consider whether the process is capable of meeting the design requirements such as size, shape, detail and tolerance. Contents Wall Thickness Wall Thickness Wall Thickness Considerations Parting Line and Ejection Parting Line and Ejection Appearance Parts Appearance Parts Ribs Ribs Gussets Gussets Bosses Bosses Boss Design for Fasteners Holes and Depressions Holes and Depressions Radii, Fillets and Corners Radii, Fillets and Corners Wall Thickness The typical plastic part may be considered to have a shell type configuration with a basic surface and features which are attached to it to meet functional requirements. From a moldability standpoint, the following are commonly regarded guidelines. Wall Thickness Considerations The actual determination of the wall thickness is based on a number of considerations. These include: Application Requirements. Structural requirements including strength, impact, fatigue or deflection will be influenced by the wall thickness selected. Electrical loads may also impact on the wall thickness. Moldability The size of the part and the ability of the material to fill the furthest point can determine the minimum wall. The maximum flow length is also a function of tool design with gate location and number of g