一般加工圈形薄壁工件的外圆,多半采用内圆涨胎;但普通内圆涨胎有很多缺点,如空心圆的偏差太大,工具刚度不够,不能加深吃刀量,装拆不方便等等。后经我厂周耀南同志的研究,改进成现在使用的内圆涨胎。这涨胎由心轴、涨圈、螺帽三个零件组成(如附图)。使用方法:1)将涨胎心轴装在车床主轴孔内,再用φ1/2〃的长螺杆固定。2)将螺帽的凸边嵌在涨圈的凹槽内,然后一并装在心轴上,使涨圈的内锥孔与心轴上的锥面配合,使螺帽与心轴上的螺纹配合。3)将工件套在涨圈 General processing circle shaped thin-walled parts of the outer circle, most of the use of inner circle up tire; but ordinary inner circle up tire has many shortcomings, such as hollow circle deviation is too large, the tool stiffness is not enough, can not deepen the amount of eating, disassembly inconvenient and many more. After the study by our factory Comrade Zhou Yaonan, improved into the current use of the inner circle up tire. This uptake by the mandrel, up ring, nut three parts (as shown). Usage: 1) The fetal heart shaft installed in the spindle hole, and then φ1 / 2〃 long screw fixed. 2) The convex edge of the nut embedded in the ring groove, and then installed on the mandrel, the ring taper hole and mandrel conical surface with the nut and the mandrel on the thread Cooperation. 3) Set the workpiece in the ring up