在许多轮式拖拉机中比较普遍地采用着三角形花键(俗名麦芒键)。如回转轴、转向轴、转向臂轴、左右转向节轴等零件上都有三角形花键。这些零件的键齿磨损后可采取堆焊后再加工出键齿的方法进行修复。由于这些三角形花键的齿形两侧面夹角都是90°(图1),所以加工时一般可以用90°的角度铣刀铣出键齿,如果没有这种铣刀,也可以采用三面刃铣刀来加工。 In many wheeled tractors more commonly used triangular spline (commonly known as wheat-key). Such as the rotary shaft, steering shaft, steering arm shaft, left and right steering shaft and other parts have triangular splines. These parts of the tooth wear can be taken after welding and then processing the key tooth method to repair. As the angle between the two sides of these triangular splines is 90 ° (Figure 1), it is usually possible to mill the key teeth with a 90 ° angle milling cutter. Without this cutter, three-sided cutting edges Milling cutter to process.