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国外模具表面常用的描述方式moldFinish

Choosing a Finish When designing a part for injection molding, it is important to keep in mind the relationships between surface finish, moldability, cost and lead time.

Table 1 contains the list of standard surface finishes available through Protomold's rapid injection molding service, listed in order from lowest to highest cost. Figure 1: List of available standard finishes

Higher

Cost

PM-F0:

PM-F1:

Non-cosmetic —finish to Protomold discretion Low-cosmetic —most toolmarks removed SPI-C1:

SPI-B1:

600 grit stone, 10-12 Ra 600 grit paper , 2-3 Ra PM-T1:

PM-T2:

Protomold texture, SPI-C1 followed by light bead blast Protomold texture, SPI-C1 followed by medium bead blast SPI-A2:

Grade #2 Diamond Buff, 1-2 Ra

"PM" in the table signifies a surface finish adjusted to fit the rapid injection molding process, where SPI (The Society of the Plastics Industry) denotes an industry-standard finish. The photographs shown in Figure 1 illustrate the difference in cosmetic appearance for a few of these options on some example parts.

国外模具表面常用的描述方式moldFinish

Figure 1: Surface finish examples

If the part will not be visible to the end user, you will probably choose to specify either PM-F0 or PM-F1 using the

drop-down menus on your ProtoQuote (see sample). But many times your design will require a more cosmetic surface finish. In these cases there are two key things to keep in mind:

• Polishing: Smoother part surfaces are achieved using manual mold polishing techniques. Consider a part