Since the sand shell modeling production of the hull casting cannot meet the needs required, this project adopts low-pressure foundry techniques to improve the internal quantity of products.
由于型号弹上产品中壳体类铸件的砂型铸造生产不能满足要求，项目通过采用低压铸造工艺方法提高了铸件产品的内部质量。
The project of hole releasing adopted can form a protection shell with low earth stress and fuel gas pressure around the shaft, and the outburst was prevented effectively and economically.
采用钻孔释放方案，在井筒周围形成一个低地应力、低油气压力保护壳，能经济有效地预防突出。
Glass shell made of a light bulb to keep the filament in a vacuum, or inert gas under low pressure, role is to prevent oxidation of the filament at high temperature under.
电灯泡外壳用玻璃制成，把灯丝保持在真空，或低压的惰性气体之下，作用是防止灯丝在高温之下氧化。
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