渐开线齿轮滚刀的刀齿齿形合格长度是滚刀精度检验中的一个重要项目,关系到刀具的精度寿命和加工齿轮的精度。过去国内的产品,齿形合格长度一般只能保持在刃口附近的2—8毫米处。经过几次刃磨之后,刃口就超出了齿形误差的规定,切出的齿轮产生不同程度的误差。一机部1979年颁发的齿轮刀具标准(JB2494—2498—78)中,齿轮滚刀齿形合 Involute gear hob cutter teeth qualified length hob hob inspection is an important project, related to the precision tool life and precision machining gear. In the past domestic products, the qualified length of the tooth can only be maintained near the edge 2-8 mm. After several sharpening, the edge of the tooth beyond the provisions of the toothed error, cut out the gear produce different degrees of error. In 1979, a machine department issued gear tool standards (JB2494-2498-78), gear hob gear combination