哈尔滨拖拉机厂生产的各种型号拖拉机中的光孔盘状齿轮日益增多，但多年来光孔盘状齿轮一直用三针（五针）夹盘爪夹紧定位，甚至夹齿顶加工，质量不稳定、合格率低，尤其是对不能三等分的斜齿，加工质量更差，效率低。通过几年来的实践，我们认为偏心式自定心夹具（简称节... Tractors in Harbin tractor manufacturers of various types of optical disk-shaped disc gear more and more, but over the years optical disc-shaped gear has been using three-pin (five-pin) claw claw clamping positioning, and even the tooth top machining, the quality is not Stable, low pass rate, especially for helical teeth can not be divided into three equal parts, the quality of processing worse, low efficiency. After several years of practice, we believe that eccentric self-centering fixture (referred to as section ...