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我厂生产的后摇架,有两个有同轴度要求的盲孔2———φ40N7,是在改造后的CA6140车床上加工的。由于工件靠毛面定位,因此必须在一次装夹中完成粗镗、半精镗和精镗加工。开始时镗刀杆与机床主轴的联接使用图1所示结构,由联接套1、镗刀杆3和紧固螺钉2组成。联接套1装在主轴上,镗刀杆3与联接套1的配合为φ32H7/f6。机床主轴近轴端径向圆跳动为 0.01mm,测得刀尖重复定位精度在O.02mm左右,工件的废品率为40％。同时换刀时还要对定镗刀杆3上的刻线,使与联接套1上的刻线重合,操作速度难以提高。因此这种结构费工费时,且定位精度不足。在本工序的操作中共需六次换刀,显然,如何提高换刀速度和镗刀杆的重复定位精度是提高本工序加工效率和加工精度的关键。
After the cradle that our factory produces, there are two blind holes 2 - φ40N7 which have coaxial requirements, which are machined on the modified CA6140 lathe. Due to the positioning of the workpiece by the matte surface, it is necessary to finish the rough boring, semi-fine boring and fine boring in a single setup. The beginning of boring bar and machine tool spindle coupling using the structure shown in Figure 1, the coupling sleeve 1, boring bar 3 and fastening screws 2 composition. Coupling sleeve 1 mounted on the spindle, boring bar 3 and the coupling sleeve with a φ32H7 / f6. The radial rotation of the spindle at the paraxial side of the machine tool was 0.01mm. The accuracy of the tip positioning was measured at around O.02mm, and the reject rate of the workpiece was 40%. At the same time when the tool change must boring boring bar 3 on the engraved lines, so that the engraving with a coincidence sleeve 1, the operating speed is difficult to increase. Therefore, this structure takes time and effort, and the positioning accuracy is insufficient. Need to change the knife six times in the operation of the process, it is clear that how to improve the tool change speed and boring bar repetitive positioning accuracy is to improve the process efficiency and processing accuracy of the key.