The so-called broach refers to the order of size, the rough cutter and the fine cutter. Most of the cutters are mainly installed on the broaching machine, which is called the broach. Broach is a forming tool used for broaching. There are multiple rows of cutter teeth on the surface of the cutter, and the size and shape of each row of cutter teeth increase and change sequentially from the cutting end to the cutting end. When the broach makes a broaching motion, each tooth cuts a certain thickness of metal from the workpiece, and finally obtains the required size and shape.