拉刀前角的选择,大部分资料介绍,是根据工件材料的种类。而同一种材料,由于交货时的状态或加工过程是否经过热处理,其硬度相差悬殊,机械性能也差异很大。现各资料所介绍的拉刀前角选择,也各不一致,差别较大,不能在实践中得到广泛运用。经过较长时间的摸索,经实践证明,按工件的抗拉强度或硬度选择拉刀的前角,较为适宜。具体数据如表所示。前角的选择对拉刀的耐用度和工件质量的好坏影响很大,一般在加工钢件时,切削部分的前角,在不影响刀齿 Broach angle of choice, most of the information is based on the type of workpiece material. The same kind of material, due to the delivery of the state or process is heat treated, the hardness difference, the mechanical properties are also very different. The data are introduced before the choice of broach angle, but also inconsistent, the difference is large, can not be widely used in practice. After a longer period of exploration, proved by practice, according to the tensile strength or hardness of the workpiece to select broach rake, more appropriate. Specific data as shown in the table. The choice of rake angle of the durability of the broach and the quality of the workpiece has a great impact, usually in the processing of steel, the cutting part of the rake angle, without affecting the teeth