变矩器叶轮精度的重要指标之一,是叶片和流道的“表面轮廓度”,它对变矩器性能有重要影响。叶片和流道是铸造成形的,不能进行机械加工,但这种精度除与铸造有关外,车削加工时,也会或多或少地降低精度。当车削基准选择不当时,精度会严重降至达不到图纸要求。有时还可能将叶片的尖部车去一部分。特别是在组芯铸造的叶轮更容易产生,因为组芯铸造叶轮的叶片尖部常有一些“披缝”,以致使叶片和披缝之间没有明显的界限。此外,车削基准面常与铸造工艺有关,为了车削基准的需要,有时也应在铸造工艺中采用一定的办法。因此,这是一种介于铸造和机 One of the key indicators of the torque converter impeller accuracy is the “surface profile” of the blades and runners, which has a significant impact on the performance of the torque converter. Blades and runners are cast and shaped and can not be machined, but this accuracy, in addition to casting, also reduces accuracy more or less during turning. When the turning datum is not properly selected, the accuracy will be seriously reduced to less than the drawing requirements. Sometimes it is possible to drive the tip of the blade to a portion. In particular, the impeller cast in the core of a set is more likely to be produced because the tip of the set of core cast impellers often has a number of “slits” so that there is no clear boundary between the blade and the slits. In addition, the turning plane is often associated with the casting process, in order to meet the needs of the turning datum, and sometimes the casting process should be used in certain ways. So this is a kind of casting and machine