Broaching operation

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Broaching is a machining operation which uses a toothed tool called a broach (metalwork) to remove material. Broaching can remove material from either the inside or outside of the workpiece depending on the position of the machine. Broaching machines usually push or pull the broaches and are either horizontal or vertical. Broaching can produce parts with both a good surface finish and dimensional accuracy. Even though broaches can be expensive, broaching is usually favorable to other processes when used for high-quantity production runs.

Broaching machines have four major operation types. These operations are:

  Surface broaching

  Pull down broaching

  Push broaching

  Pot broaching

Major design considerations for broaching are:

  Parts should be designed so they can be securely clamped onto the machine. 

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

  Chamfers are preferable to round corners. 

External References

Gear Product News http://www.gearproductnews.com/issues/0206/broaching_basics.pdf

Anderson Tool & Engineering Inc. http://www.ateinc.com/astroBroach/PrinciplesOfOperation.html

Fox Valley Technical College http://its.foxvalleytech.com/MachShop3/broach/BroachingIS.htm