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我厂今年试制的新产品中有一项是11—5/ 450型压缩机。这台压缩机是为聚乙烯压缩机 配套用的,是生产塑料制品的重要设备,是解 决我国吃饭穿衣问题的一个重要步骤,领导机 关对此非常重视,要求我厂一定要保证质量及 早完成。 11-5/450型压缩机的缸套材料规定是铝 铁青铜铸件。铝铁青铜有一特点:极易氧化和 收缩率甚大,这就给缸套的铸造带来了极大的 困难;不仅如此,同时缸套技术条件要求非常 高:化学成分A（?）8～10％、Fe2～4％;硬度 ≮110;强度40kg/mm～2;延伸率10％;还要能
One of our new trial products this year is the 11-5 / 450 compressor. This compressor is used for polyethylene compressor, is an important equipment for the production of plastic products, is an important step to solve the problem of food and clothing in our country, the leadership attaches great importance to this, I plant must ensure the quality of early completion . 11-5 / 450 compressor liner material requirements are aluminum bronze castings. Aluminum bronze has a characteristic: extremely easy to oxidation and shrinkage rate is very large, which gives the casting of the cylinder has brought great difficulties; not only that, at the same time the technical requirements of cylinder liner is very high: chemical composition A (?) 8 ~ 10 %, Fe2 ~ 4%; hardness ≮110; strength 40kg / mm ~ 2; elongation 10%; but also to