我厂生产的几种压缩机气缸套,其内径为Φ125毫米、长度为838毫米,Φ45毫米、长度292毫米和Φ25毫米、长度为300毫米等,材质为45号钢或铸铁,内径表面光洁度为（?）7-（?）8。在成批生产的情况下,加工这样长度较大,光洁度要求又高的工件应用一般的镗削方法,显然是达不到要求,不仅效率低,而且由于工件长,刀桿容易发生振动,加工后很容易出现锥口等。 针对上述情况我厂在1958年就开始了试验和试用浮动镗刀的工作。几年来根据生产实践又作了一些改进。使用效果很好,完全可以达到工件的几何精度及表面光洁度的要求。根据加工内径的不同,可分为三种类型: I produced several compressor cylinder liner, the diameter of Φ125 mm, a length of 838 mm, Φ45 mm, length 292 mm and Φ25 mm, a length of 300 mm, made of 45 steel or cast iron, the inner diameter of the surface finish (?) 7 - (?) 8. In batch production, the processing of such a large, high finish requirements of the workpiece using the normal boring method is clearly not meet the requirements, not only inefficient, but also because the workpiece is long, easy to vibration arbor, machining After the cone is prone to appear. In response to the above situation I plant in 1958 began the trial and trial of floating boring knife work. In recent years, according to production practices made some improvements. The use of good results, can achieve the geometric accuracy of the workpiece and the surface finish requirements. According to the different processing diameter, can be divided into three types: