随着用高强度、高硬度和其它难加工材料制造齿轮的日益增多;为了用精滚法代替磨齿工艺或减少磨齿序的加工余量来加工硬齿面齿轮,硬质合金滚刀逐渐被广泛应用。日本Azumi公司在七十年代初首创用钎焊法创造了具有大负前角(-30°、-35°)的大、中模数的硬质合金滚刀。一、硬质合金滚刀可焊性分析1、硬质合金热膨胀系数只有钢的一半,钎焊时容易产生裂纹。然而,对于小块(钎焊 With the increasing use of gears made of high strength, high hardness and other difficult-to-machine materials, the hardened hobs have been gradually being used to machine hardened gears by using a precision-roll method instead of a grinding process or with a reduced grinding allowance widely used. Japan’s Azumi Company pioneered the use of brazing in the early 1970s to create large and medium-modulus carbide hobs with large negative rake angles (-30 °, -35 °). First, the carbide hob weldability analysis 1, the cemented carbide thermal expansion coefficient is only half of the steel, easy to crack when brazing. However, for small pieces (brazed