Rotary Broach Tools

Written by cathel hutchison
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Rotary Broach Tools
Rotary broaching is a metalworking process used to produce polygon forms. (Jupiterimages/Comstock/Getty Images)

Rotary broaching, also known as wobble broaching, is a method of producing internal and external polygon forms on the end of a work piece while it is rotating. The rotary broaching process takes just seconds and is capable of producing forms with an accuracy in excess of 0.0005-inch. The process can be performed at the same time as other operations, increasing the speed and profitability of production. Rotary broaching requires a tool holder and a broach.

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General Features

Rotary broach tools are typically manufactured from high quality, M2 high-speed steel. They are equipped with an air vent hole for pressure relief. They are hardened to over 62 Rockwell and can have straight or morse taper shanks. In addition, they have an eight-degree rake angle. Standard rotary broaches can be modified for the following features: powdered metal high-speed steel or cobalt high-speed steel, no air vent hole or double air vent holes, and custom flat-to-flat dimensions.

Coatings and Special Features

Rotary broach tools can have a range of coatings, including titanium nitride, titanium carbo-nitride and titanium aluminium nitride. The form depth and overall length can also be customised. In addition, special types of rotary broaches are available, such as double hex and square, gear, involute, keyway, as well as serration and spline.

Types of Rotary Broach Tools

There are many types of rotary broach tools available. These include adjustment-free Swiss types that are designed for smaller European machines, where clearance is a concern. The standard, adjustment-free type is designed to accept a wide variety of forms and is easy to use while the heavy-duty type is built for speed and designed for larger forms. There is also a large form type designed for accuracy on larger forms.

Internal Hexagonal Rotary Broaches

The internal hexagonal rotary broaches from Polygon Solutions have a shank diameter of 0.315 inch (8mm) and an overall length of 1.25 inches. These broaches range in dimension, from 0.0510-inch across the flats and a broach depth of 0.102-inch, to 0.4775-inch across flats and a depth of 0.650-inch.

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