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图示的键槽校准拉刀(苏联作者发明证650839)可用来熨压并校准经热处理后钢制齿轮零件上的键槽之用。它可切除少量金属,也能使金属强化。这种拉刀是由刀体1、楔2、以及由硬质合金刀片作的刀齿3组成。刀齿3是用楔固定在刀体1的刀槽内,刀齿在刀槽内是倾斜β角安装的(β=2°～3°)。所以每个刀齿的切削刃A上都具有近似等于β角的负前角,这由切钢时从硬质合金刀齿耐用度的观点来看是合理的。而刀齿上的另一侧刃口则是圆弧形的挤压刃。两个刃口都配置在与拉刀轴线垂直的平面
The illustrated keyway calibration broach (Soviet Author Certificate No. 650839) can be used to press and calibrate keyways on heat treated steel gear components. It can cut a small amount of metal, but also make the metal strengthen. This broach is composed of the body 1, the wedge 2, and the tooth 3 made of a cemented carbide blade. The knife tooth 3 is fixed in the knife groove of the cutter body 1 by a wedge, and the knife tooth is installed in the knife groove at an angle β (β = 2 ° -3 °). The cutting edge A of each tooth has a negative rake angle that is approximately equal to the beta angle, which is reasonable from the viewpoint of the durability of the carbide tooth when cutting the steel. While the blade on the other side of the blade is arc-shaped extrusion blade. Both cutting edges are arranged on a plane perpendicular to the broach axis