在机械加工中,三爪卡盘是最基本的定心夹具。过去修磨三爪卡盘是用细铁条串联三根铁棒,铁条放于卡爪端面小槽内,旋紧卡爪,然后转动卡盘,用磨内圆的砂轮进行修磨(见图1)。这种方法修磨卡爪费时费力,又不安全。同时对于垂直方向使用的卡爪还无法修磨。为此,我们自制了修磨三爪卡盘的辅助夹具。辅助夹具的结构见图2。夹具的具体尺寸根据三爪卡盘的大小而定。辅助夹具先用直径大于卡爪端面 In machining, three jaw chuck is the most basic centering fixture. In the past, the three-jaw chuck was trimmed with three thin iron bars in series. The iron bars were placed in the small grooves on the end faces of the jaws. The jaws were tightened and then the chuck was rotated to grind with the grinding wheel 1). This method sharpening jaws is time-consuming and unsafe. At the same time for the vertical use of the jaws can not be sharpened. To this end, we made a self-trimming chuck trimming fixture. Auxiliary fixture structure shown in Figure 2. The specific size of the fixture depends on the size of the three-jaw chuck. Auxiliary fixture first diameter greater than the claw end