Broaching is a
machining process that uses a toothed tool, called a
broach, to remove material. There are two main
types of broaching: linear
and rotary. In linear broaching, which is the more
common process, the broach is run linearly against a
surface of the workpiece to effect the cut.
Linear broaches are used in a broaching machine,
which is also sometimes shortened to broach. In rotary
broaching, the broach is rotated and pressed into the workpiece to cut an axis symmetric
shape. A rotary broach is used in a
lathe or
screw machine. In both processes the cut is
performed in one pass of the broach, which makes it very
efficient.Broaching is used
when precision machining is required, especially for odd
shapes. Commonly machined surfaces include circular and
non-circular holes,
splines,
keyways, and flat surfaces. Typical workpieces
include small to medium sized
castings,
forgings, screw machine parts, and stampings.