tailieunhanh - The Plastic Product P2

Are Special Fits with Matching Products Required? Often, certain dimensions of a product are specified with unnecessary close tolerances, when all the designer wanted to convey is that the product should fit suitably on another product (tightly or loosely), typically, a container and a matching lid. This requirement must be clear. Especially, when molding plastics with high shrinkage factors (., PP or PE), it can be difficult to arrive at the proper “steel” dimensions, and some experimenting may be required to achieve the required fit. . | Copyrighted Materials Copyright 2006 Hanser Publishers Retrieved from I Accuracy and Tolerances Requires--------------------------------- Previous Page Are Special Fits with Matching Products Required Often certain dimensions of a product are specified with unnecessary close tolerances when all the designer wanted to convey is that the product should fit suitably on another product tightly or loosely typically a container and a matching lid. This requirement must be clear. Especially when molding plastics with high shrinkage factors . PP or PE it can be difficult to arrive at the proper steel dimensions and some experimenting may be required to achieve the required fit. Specifying the matching diameters with standard loose tolerances may yield pieces correct in size but wrong because the fit is not as desired. The alternative - providing closer tolerances - could be unreasonable because the dimension of the molded product depend not solely on the steel dimensions of the stack parts but also on the molding parameters. In such cases it is of advantage to complete the more complicated mold first and test it in actual molding conditions until the best cycle time is established. The critical mold parts of the matching product . the lid should be finish-machined only after having established what the actual molded container dimensions are. This could require completing the lid mold with only one cavity using assumed suitable dimensions testing the unfinished mold until the best cycle is achieved and then adjusting the assumed dimensions so that the proper fit can be achieved. All lid mold parts can then be finished. For more information on this subject see 5 . Prototyping is often used to verify the required dimensions or fits of a part after shrinkage 21 Tolerances for the Filling Volume This applies specifically - but is not restricted - to containers into which a more or less viscous product will be filled by volume to within .

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