Brief introduction

Introduction Forming tools for broaching. There are several rows of cutter teeth on the tool surface, and the size and shape of each row of cutter teeth increase and change in sequence from the cutting end to the cut end. When the broaching tool is used for broaching, each blade cuts a certain thickness of metal from the workpiece to obtain the desired size and shape. Broaching tools are often used to produce round holes, spline holes, keyways, flat surfaces, and forming surfaces in batch and mass production, and have high productivity. The broach is divided into the inner broach and the outer broach according to the different parts of the processing surface. According to the different ways of working, the broach is divided into a broach and a push knife. Push knives are often used to calibrate heat treated holes.

The structure of the structural broach and the shape of the teeth are related to the broaching method. Broaching methods are usually divided into two types: layered broaching and block broaching. The former is divided into form and gradual form; the latter is divided into round cuts and integrated round cuts. The contours of the broaches are similar to the final shape of the surface to be machined. The shape of the incremental broach is different from the shape of the workpiece. The shape of the workpiece is gradually formed by cutting each tooth. The rotary broaching knife is composed of multiple sets of cutter teeth. Each set has several cutters with the same diameter and respectively cuts out a layer of metal, and the cutter gears of each group are used to cut out and remove the metal from each layer. The rough-cut teeth of the integrated wheel-cutting broach adopt a wheel-cut type, and the fine-cut teeth adopt a form. The cutting thickness of the rotary broach is much larger than that of the layered broach. It has high productivity but is difficult to manufacture.