The art of making
identical parts with injection molding lies in either the process or the
machine set up sheet. The funny thing is, how hard it is to find two of them
that are identical.
From run to run, injection molding parts need to be identical. The scope of what identical means can actually change from industry to industry for example aviation and medical field parts have different standards for identical than flower pots or drink coasters.
At the center of every attempt for reaching "identical" is the process or the machine set up sheet. Set up sheets are for documenting your process variables. Identical is accomplished when the specifications for machine, molds and resin processes are worked so the variables can be managed properly.
From run to run, injection molding parts need to be identical. The scope of what identical means can actually change from industry to industry for example aviation and medical field parts have different standards for identical than flower pots or drink coasters.
At the center of every attempt for reaching "identical" is the process or the machine set up sheet. Set up sheets are for documenting your process variables. Identical is accomplished when the specifications for machine, molds and resin processes are worked so the variables can be managed properly.
The processor for
injection molding has to deal with hundreds of variables. Variables can include
moisture content of the materials or the temperature of the melt. To make parts
identical requires a way to guarantee that the process variables are controlled
so they can be held in a stable and reasonable tolerance.
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