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Mold Selection P1

Mold Selection Selection of an Appropriate Mold Once a good product design has been achieved and it is decided where the product will be made and how many cavities are required, we must consider the available alternatives for the molds. Dedicated Mold, Universal Mold Shoe “Dedicated mold” means a complete mold that is used for one purpose only. After use, the mold is put into storage until it is used again. | 113 Copyrighted Materials Copyright 2006 Hanser Publishers Retrieved fromwww.knovel.com 4 Mold Selection 4.1 Selection of an Appropriate Mold Once a good product design has been achieved and it is decided where the product will be made and how many cavities are required we must consider the available alternatives for the molds. 4.1.1 Dedicated Mold Universal Mold Shoe Dedicated mold means a complete mold that is used for one purpose only. After use the mold is put into storage until it is used again. This is the most common type of mold. Occasionally especially with molds with 2-8 cavities the same mold shoe can be and often is used for more than one set of cavities and cores. In principle there is nothing wrong with this concept provided the molding shop is well organized good record keeping and proper storage facilities for the loose stack parts and the personnel is capable of making the switch from one product to another without the need for high-priced mold makers. It may take a few hours to switch from one set of stacks to another and there is always the risk of damage to the mold components in handling and during assembly. The question is whether it is worthwhile to switch molds especially if it is done frequently. If the mold shoe is quite simple it would be better safer and more economical to have a dedicated mold. But there are cases where the mold shoe is large complicated and relatively expensive if the stacks for the various preferably similar products are designed from the beginning so that they can be easily interchanged this is a very good and economical solution. Figure 4.1 A 4-level mold designated to quickly switch to different sets of inserts Courtesy Stackteck Dedicated molds are usually preferred. However the use of a common mold shoe with different sets of stacks can often be more economical Typical examples are 4- or 6-cavity molds for a series of round containers with none or only small differences in diameters but with large differences in