螺纹环规、板牙等螺孔的研磨通常用图1所示的螺孔研磨芯研磨。a型研磨芯构造简单,尺寸不可调,因而使用寿命短,研磨螺孔时,还容易产生喇叭口,目前很少使用。b型研磨芯可在锥度塞子2的作用下,对研磨芯直径进行一定范围的调整,调整后的研磨芯直径,呈现中间大两头小,适于研磨工作特性,研磨时不易产生喇叭口。但调整直径过大时,螺距和 Thread ring gage, billet and other screw hole grinding is usually shown in Figure 1 with a screw hole grinding core grinding. A-type grinding core structure is simple, the size is not adjustable, so the service life is short, grinding screw hole, but also prone to bell mouth, rarely used. b-type grinding core taper plug 2 under the action of the diameter of the grinding core to a range of adjustments, the diameter of the adjusted grinding core, showing the middle of the small two large, suitable for grinding work characteristics, grinding is not easy to produce bell mouth. But adjust the diameter is too large, pitch and pitch