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What is Broaching, Tool Grinding/Sharpening?

Definition Broaching 

For broaching, a high-quality, multi-tooth tool is used, whose cutting teeth are arranged one behind the other by one chip thickness. The feed motion is replaced by the staggered arrangement of the cutting teeth. The last teeth of the broaching tool have the profile desired on the workpiece. The geometry of the profile, its shape as well as the dimensions and tolerances of the profiles created during machining are predefined in the workpiece.

Only regular maintenance by resharpening and coating of the tool allows a constant reproducibility.

Broach grinding

The materials used place high demands on the machine and grinding wheels. Materials such as HSS and tungsten are used. The machines in conjunction with the grinding wheels must guarantee high profile accuracy, good dimensional stability and a high surface quality on the finished product.  The grinding machines must also meet requirements such as:

• Geometric variety
• Short set-up times due to high flexibility
• Flexible technology software with measurement strategies that take into account the tool's operating behavior

The machines should be able to produce the geometrical accuracy and the required grinding quality both during new production and resharpening, because only these factors determine the process capability and economic efficiency over the entire service life of the broaching tool. Equipped with a swivel spindle, ring-shaped and twisted flutes can be sharpened. The machine should also be able to carry out any desired helix, twist angle, and relief grinding of the profiles. The chip chambers and the profile can be produced in both deep grinding and pendulum grinding. Burr-free grinding of the cutting edges has a further influence on the service life of the broaching tools. Burr formation is always an indication of surface structure thermal degradation of the cutting edges.