齿轮加工机床的种类繁多，构造各异：
要求：刀具的切削刃形状与被切齿轮的齿槽形状相吻合。
优点：机床较简单，可利用通用机床加工。
缺点：
1.每加工完一个齿槽后，工件需要周期地分度一次，生产率也较低。
2.加工出来的齿形是近似的，加工精度较低；
3.对于同一模数的齿轮，只要齿数不同，齿廓形状就不相同，需采用不同的成形刀具；
滚齿法
母线（渐开线）:采用成形法，机床不需要表面成形运动。形成导线（直线）:相切法。机床需要两个成形运动。一个是铣刀的旋转B1，一个铣刀沿齿坯的轴向移动A。两个都是简单运动。铣完一个齿后，铣刀返回原位，齿坯作分度运动——转过360º/z（z是被加工齿轮的齿数），然后再铣下一个齿槽，直至全部齿被铣削完毕。
There are various types and structures of gear machining machines:
Requirement: The cutting edge shape of the tool should match the tooth groove shape of the gear being cut.
Advantages: The machine tool is relatively simple and can be processed using general-purpose machine tools.
Disadvantages:
After each tooth groove is processed, the workpiece needs to be divided periodically, and the productivity is also relatively low.
2. The processed tooth profile is approximate and the machining accuracy is relatively low;
3. For gears with the same module, as long as the number of teeth is different, the tooth profile shape is different, and different forming tools are required; Gear hobbing method
Busbar (involute): Using forming method, the machine tool does not require surface forming motion. Forming a wire (straight line): Tangent method. Machine tools require two forming movements. One is the rotation B1 of the milling cutter, and the other is the axial movement A of the milling cutter along the tooth blank. Both are simple exercises. After milling a tooth, the milling cutter returns to its original position and the tooth blank undergoes indexing motion - turning 360 degrees/ Z (z is the number of teeth of the processed gear), and then mill the next tooth slot until all teeth are milled.
