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Broaching
Broaching is one of the metal machining operations done by a
multipoint cutting tool called
broaching tool or broach
There are two main types of broaching: linearand rotary
Commonly machined surfaces include circular and non-circular
holes,splines,keyways, and
flat surfaces.
The broaching is a high productivity method as so many cutting
edges work to machine the
workpiece at a time
Broaching works best on softer materials, such
asbrass,bronze,copper
alloys,aluminium,graphite, hardrubbers,wood,composites,
andplastic.
The final shape may be a smoother, flatter surface, larger hole,
complex splined, toothed
notched curved, helical, or some other irregularly shaped
section. Almost any irregular
cross-section can be broached as long as all surfaces of the
section remain parellel to
the direction of broach travel.
Function: roughing, sizing, or burnishing
he only limitations on broaching are that there are no
obstructions over the length of the
surface to be machined, the geometry to be cut does not have
curves in multiple
planes,[8]
and that the workpiece is strong enough to withstand the forces
involved.
Tooling is the heart of any broaching process. The broaching
tool is based on a conceptunique to the process - rough,
semi-finish, and finish cutting teeth combined in one tool
or string of tools.
The slab broach is the simplest surface broach. It is a general
purpose tool for cutting flat
surfaces
Slot broaches (G & H) are for cutting slots of various
dimensions at high production rates. Slot
broaching is much quicker thanmillingwhen more than one slot
needs to be machined,
because multiple broaches can be run through the part at the
same time on the same
broaching machine.
Contour broaches are designed to cut concave, convex, cam-,
contoured, and irregular
shaped surfaces
Pot broaches are cut the inverse of an internal broach; they cut
the outside diameter of a
cylindrical workpiece. They are named after the pot looking
fixture in which the broaches are
mounted; the fixture is often referred to as a "pot". The pot is
designed to hold multiple
broaching tools concentrically over its entire length.
Straddle broaches use two slab broaches to cut parallel surfaces
on opposite sides of a
workpiece in one pass. This type of broaching holds closer
tolerances than if the two cuts
were done independently
http://en.wikipedia.org/wiki/Rotating_splinehttp://en.wikipedia.org/wiki/Rotating_splinehttp://en.wikipedia.org/wiki/Rotating_splinehttp://en.wikipedia.org/wiki/Key_(engineering)http://en.wikipedia.org/wiki/Key_(engineering)http://en.wikipedia.org/wiki/Key_(engineering)http://en.wikipedia.org/wiki/Brasshttp://en.wikipedia.org/wiki/Brasshttp://en.wikipedia.org/wiki/Brasshttp://en.wikipedia.org/wiki/Bronzehttp://en.wikipedia.org/wiki/Bronzehttp://en.wikipedia.org/wiki/Bronzehttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Aluminiumhttp://en.wikipedia.org/wiki/Aluminiumhttp://en.wikipedia.org/wiki/Aluminiumhttp://en.wikipedia.org/wiki/Graphitehttp://en.wikipedia.org/wiki/Graphitehttp://en.wikipedia.org/wiki/Graphitehttp://en.wikipedia.org/wiki/Rubberhttp://en.wikipedia.org/wiki/Rubberhttp://en.wikipedia.org/wiki/Rubberhttp://en.wikipedia.org/wiki/Woodhttp://en.wikipedia.org/wiki/Woodhttp://en.wikipedia.org/wiki/Woodhttp://en.wikipedia.org/wiki/Composite_materialhttp://en.wikipedia.org/wiki/Composite_materialhttp://en.wikipedia.org/wiki/Composite_materialhttp://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Broaching_(metalworking)#cite_note-basics-8http://en.wikipedia.org/wiki/Broaching_(metalworking)#cite_note-basics-8http://en.wikipedia.org/wiki/Broaching_(metalworking)#cite_note-basics-8http://en.wikipedia.org/wiki/Milling_machinehttp://en.wikipedia.org/wiki/Milling_machinehttp://en.wikipedia.org/wiki/Milling_machinehttp://en.wikipedia.org/wiki/Milling_machinehttp://en.wikipedia.org/wiki/Broaching_(metalworking)#cite_note-basics-8http://en.wikipedia.org/wiki/Plastichttp://en.wikipedia.org/wiki/Composite_materialhttp://en.wikipedia.org/wiki/Woodhttp://en.wikipedia.org/wiki/Rubberhttp://en.wikipedia.org/wiki/Graphitehttp://en.wikipedia.org/wiki/Aluminiumhttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Copper_alloyhttp://en.wikipedia.org/wiki/Bronzehttp://en.wikipedia.org/wiki/Brasshttp://en.wikipedia.org/wiki/Key_(engineering)http://en.wikipedia.org/wiki/Rotating_spline
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Machine tool Description Process
grinding machine Improve surface finish, abradehard material,
and tighten thetolerance on flat and cylindricalsurfaces by
removing smallamount of material.
used to finish workpieces that mustshow high surface quality
(e.g.,lowsurface roughness) andhighaccuracyof shape
anddimension.
Applied if:Material too hard to be machinedClose tolerances
required
Lathe machine perform various operations
suchascutting,sanding,knurling,drilling,ordeformation,facing,turning,
withdifferent tools
Planner Produces surfaces.
Drilling machine
Honing
Milling machine The tool is called a milling cutter
o making flat surfaceso grooving, slitting andparting
o helical grooving
Boring machine
shaper
http://en.wikipedia.org/wiki/Surface_roughnesshttp://en.wikipedia.org/wiki/Surface_roughnesshttp://en.wikipedia.org/wiki/Surface_roughnesshttp://en.wikipedia.org/wiki/Accuracyhttp://en.wikipedia.org/wiki/Accuracyhttp://en.wikipedia.org/wiki/Accuracyhttp://en.wikipedia.org/wiki/Cuttinghttp://en.wikipedia.org/wiki/Cuttinghttp://en.wikipedia.org/wiki/Cuttinghttp://en.wikipedia.org/wiki/Sandinghttp://en.wikipedia.org/wiki/Sandinghttp://en.wikipedia.org/wiki/Sandinghttp://en.wikipedia.org/wiki/Knurlinghttp://en.wikipedia.org/wiki/Knurlinghttp://en.wikipedia.org/wiki/Knurlinghttp://en.wikipedia.org/wiki/Drillinghttp://en.wikipedia.org/wiki/Drillinghttp://en.wikipedia.org/wiki/Drillinghttp://en.wikipedia.org/wiki/Deformation_(engineering)http://en.wikipedia.org/wiki/Deformation_(engineering)http://en.wikipedia.org/wiki/Deformation_(engineering)http://en.wikipedia.org/wiki/Facinghttp://en.wikipedia.org/wiki/Facinghttp://en.wikipedia.org/wiki/Facinghttp://en.wikipedia.org/wiki/Turninghttp://en.wikipedia.org/wiki/Turninghttp://en.wikipedia.org/wiki/Turninghttp://en.wikipedia.org/wiki/Turninghttp://en.wikipedia.org/wiki/Facinghttp://en.wikipedia.org/wiki/Deformation_(engineering)http://en.wikipedia.org/wiki/Drillinghttp://en.wikipedia.org/wiki/Knurlinghttp://en.wikipedia.org/wiki/Sandinghttp://en.wikipedia.org/wiki/Cuttinghttp://en.wikipedia.org/wiki/Accuracyhttp://en.wikipedia.org/wiki/Surface_roughness
