Push, Pull, Internal and External Broaching Services

A broach can be designed to create any shape such as square, rectangle or hexagonal opening.  A broach is comprised of a successive series of teeth, or chisel points, that are designed to remove incremental amounts of material from the broaches contact surface with the part, as the broach is drawn (pushed or pulled) through the part.  From a conceptional view, a broach can be circular at one end and square or hexagonal at the opposite end, thereby achieving the desired size and shape opening as the broach is passed through a part, like the ID of a hub assembly.    The four primary classes of broaching are push, pull, internal and external broaching.

The most common broach design available is used to create an internal square or rectangular keyways within a specified ID of a hub assembly.  To achieve this a broach bushing, that aligns with the internal ID clearance of a part, is used to align (fixture) the broach as the broach is drawn through the part.  Shims are applied between the bushing and broach, followed by successive passes of the broach to achieve the required keyway depth.       

Almost any shape can be broached and the process can be applied to both the internal and external surfaces of a part, however most broach designs use commercially available broach patterns to minimize tooling costs.  

03.06.09