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Broaching Process & Machine Types

Broaching is a machining process that uses a toothed tool called a broach to remove layers of material from a workpiece in one stroke. There are two main types of broaching machines: horizontal broaching machines, which are used for pull, surface, and continuous broaching operations, and vertical broaching machines, which are used for push, pull-down, pull-up, and surface broaching. Continuous broaching is used for mass production and can use either a rotary or horizontal movement to index and broach multiple workpieces. Key considerations in broaching include the material being broached, size and shape of the cut, required tolerances and surface finish, production rates, and work holding method.

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143 views5 pages

Broaching Process & Machine Types

Broaching is a machining process that uses a toothed tool called a broach to remove layers of material from a workpiece in one stroke. There are two main types of broaching machines: horizontal broaching machines, which are used for pull, surface, and continuous broaching operations, and vertical broaching machines, which are used for push, pull-down, pull-up, and surface broaching. Continuous broaching is used for mass production and can use either a rotary or horizontal movement to index and broach multiple workpieces. Key considerations in broaching include the material being broached, size and shape of the cut, required tolerances and surface finish, production rates, and work holding method.

Uploaded by

Dowell Arc
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Broaching and Broaching Machine

-What is broaching?

 Broaching is a machine process that uses a toothed tool, called a broach, to remove material.
 Broaching is similar technique to shaping with a long multiple-tooth cutter.
 Broaching is a machining process for removal of layer of material of desired width and depth
usually in one stroke by a slender rod or bar type cutter having a series of cutting edges with
gradually increasing protrusions as indicated.

Horizontal Broaching

- Are designed for pull broaching, surface broaching, continuous broaching, and rotary
broaching.

Vertical Broaching

- Designed for push broaching, pull-down broaching, pull-up broaching, or surface broaching.

Continuous broaching (Video)

-used for mass production of small work pieces.

-rotary or horizontal type of the movement can be provided.


-In rotary machine, rotary tables is used. W/P is indexed and broaching is done.

-In horizontal machine, conveyer continuously moves and broach remains steady.

~Broaching Tool

Rotary and linear Broaching (Video)

Design and construction considerations

 Material to be broached
 Size and shape of cut
 Quality of surface finish
 Part tolerance
 Production rates
 Type of machine
 Work holding method
 Strength of the work piece
Material of Broach

 Based on cutting tool material properties


 Mostly made up of HSS. Ceramic are not used as low speed
 Cemented carbide segments or replaceable inserts are also used specially for CI and
steels. TiN coating provide high life.

Product of Broaching
 Turn broaching

 The workpiece is rotated between centers, and the broach passes tangentially across
the bearing surfaces and remove material

 Broaching Machines

 Either pull or push the broaches and are made either horizontal or vertical.

 Forces required depend on workpiece material, total depth and width of cut, and
cutting speed.

 Broaching process parameters

 Cutting speeds range from 1.5m/min for high strength alloys to 15m/min for Aluminum
alloys

 Ceramic inserts may be used for finishing operations

 Design Considerations for Broaching

 Parts should be designed such that they can be clamped securely

 Blind holes, sharp corners, dovetail splines, and large flat surfaces should be avoided

 Chamfers are preferred over round corners

Chipbreakers and a Broaching Machine


Internal Broach and Turn Broaching

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