特殊铸造方法-----毕业设计外文翻译.doc

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特殊铸造方法-----毕业设计外文翻译,so far,the details of science of sand casting processes have been discussed. but sand casting is not suitable nor economical in many applications where the spec...
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So far, the details of science of sand casting processes have been discussed. But sand casting is not suitable nor economical in many applications where the special casting process would be more appropriate. In the following pages the details of some of the commonly used special casting methods would be described.
三、PERMANENT MOULD CASTING
In all the processes that have been covered so far, a mould need to


到目前为止,已经有详细的科学资料对砂型铸造方法进行了描述。但是在许多应用中,砂型铸造既不适合也不经济,而特殊铸造方法则更适合些。下面的文章中就描述了几种常用的特殊铸造方法。
三、永久模具铸造
到目前为止,在整个生产过程中这种铸造造方法都被隐藏,每个铸件需要准备一个模具。对于大规模生产,为每个铸件生产一个模具是困难又昂贵的。
根据温度的传递、铸件的尺寸大小、铸造的频率来选择模具的材料。它们决定了模具所腀@惺艿淖畲笱沽Γㄈ榷龋4峋У幕抑亲畛S玫哪>卟牧稀:辖鹬20钢和合金钢(H11和H14)也用于大体积的零件中。石墨模具可以用来做小体积的铝或镁