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二冲程内燃机活塞环内圆面定位槽, 我厂是应用B665刨床工作台而上装一套刨定位槽夹具,进行加工获得的。由于以前刨定位槽工序放在精修口之前进行,装活塞环的套筒内圆,装有一片1.2mm定向塞片,按活塞环刨定位槽后开口端部径向广度的要求,定向塞片必须凸出内圆面0.5～0.7mm。为此加工的活塞环难以达到GB1149─82规定的对称度用尺寸误差标准要求,严重造成活塞环成品开口两端附近漏光。有时漏光数量达40～50％。后对工艺路线作了调整,将创定位槽工序放在精修开口之后,检查活塞环的定位槽,对称度及尺寸误差,得到改善,可是漏光单项废品率仍然很高。经仔细考察,分析,产生开口两端附近漏光主要原因;是刨定位槽的装环套简内国直径超过活塞环名义直径引起的,（我厂采用的定向塞片厚度1.2,因之装环套内圆直径d必须大于活塞环缸径0.4左右）。造成活塞环装在套筒内开口两端不能与套简内圆面密切贴合,有一定的间隙,由于活塞环是薄壁零件,虽然加工中端面上施以一定的压紧力,用较小的吃刀深度（0.12～0.2）,但是在加工过程中仍然避免不了变形。剩余变形及加工应力的积累,严重发生开口两端附近失圆现象,一般表现为开口两侧漏光。针对上述的质量问题,我们进行无塞片装环套筒的结构设计方案试验,通过二年多生产现场使用,
Two-stroke internal combustion engine piston ring positioning round the inner surface of the slot, I plant is the application of B665 planer table and a planing groove positioning fixture, for processing obtained. As the planing groove positioning process prior to the intensive training carried out within the sleeve installed piston ring, with a 1.2mm orientation plug, according to piston ring planing positioning slot after the opening end of the radial breadth of the requirements of directional plugs The sheet must protrude the inner surface of 0.5 ~ 0.7mm. Piston ring processing for this difficult to achieve GB1149 ─ 82 provisions of the degree of symmetry with the size of the standard error, a serious cause of the piston ring near the ends of the finished product leak light. Sometimes the amount of light leakage of 40 to 50%. After the process route has been adjusted, will create a slotting process on the opening after finishing, check the piston ring positioning groove, symmetry and size of the error, improved, but the light single reject rate is still high. After careful inspection, analysis, resulting in the main reason for light leakage near the two ends of the opening; planing positioning groove ring sets the diameter of more than the nominal diameter of the piston ring caused by the (my factory using the directional plug thickness of 1.2, Inner diameter d must be greater than the piston ring bore about 0.4). Resulting in the piston ring installed in the sleeve at both ends of the sleeve can not be closely with the sleeve on the inner surface, there is a certain gap, the piston ring is a thin-walled parts, although the processing of end face to exert a certain pressure, with more Small knife depth (0.12 ~ 0.2), but still can not avoid the deformation in the processing. Residual deformation and processing stress accumulation, the serious occurrence of missing near the ends of the circle phenomenon, the general performance of the light leakage on both sides of the opening. In response to the above quality problems, we carried out the design test of the structure without plugging ring and sleeve. After more than two years of production site use,