5. Trimming (Manufacturing method)
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Many manufacturing processes for shaping parts leave
some unwanted material that must be removed from around the desired shape. Deep
drawing, die casting, forging, plastic sheet molding, compression molding,
reaction injection molding, and rotational molding are examples of processes that
may leave flash or other excess material that must be removed. Various
processes are used for such an operation, including the following: die cutting with
dies like blanking dies but with suitable clearances for the part to be
trimmed, pin routing (vertical milling), laser beam machining, abrasive jet
machining, hydrodynamic (water jet) machining, and abrasive water jet
machining.
Trimming is a stamping operation used to remove
unwanted material that occurs as a result of some other process such as
casting, forging, forming, or deep drawing. The operation is similar to
blanking except that the workpiece is a semi-finished part instead of a flat
piece of sheet stock, and the trimming die is shaped to contain the shape of
the part. In die casting, trimming removes sprues, flash, and runners. In
deep-drawing and some forming operations, trimming removes flanges left where
the material was gripped or held. A workpiece with this trimming operation is
illustrated in Fig. 2C6.
(Bralla, J. G., Handbook
Manufacturing Processes, How Products, Components and Materials Are Made,
pp. 46, 145)
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