负压氦气检漏法的运用

Application of vacuum helium leakage detection method

针对制冷压缩机内残留的装配润滑油,对壳体铸件因疏松而形成的气孔的油封作用,导致正压氦气检漏法无法在线检出铸件砂眼缺陷的现象,通过对各种检漏方法与漏率及生产节奏比较、分析得出最佳改造方案,并在设备建成后对系统进行"量具可重复性与可再现性分析"(GR&R)加以证明。研究结果在实际生产中获得了成功运用,具有实用价值。

Residual lubricating oil seals the casting micro porosity of refrigeration compressor, and forms oil mask which blocks helium gas going through during positive pressure Mass-Spec testing. Based on the calculation on leakage rate of various leakage detec tions, and takt time analysis, the optimized solution is given which is approved by final equipment GR＆R results. The result of dissertation is successfully applied to real production line with great value.