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高分子在机械工业中的应用越来越广泛，“以塑代钢”、“以塑代铁”成为目前材料科学研究的热门和重点。这类研究拓宽了材料选用范围，作机械产品从传统的安全笨重、高消耗向安全轻便、耐用和经济转变。如何恰当地选用这种材料，本文作一综述。高分子材料种类繁多．总的来说，
The application of macromolecules in machinery industry is more and more widespread. “Substituting plastic for steel” and “substituting plastic for iron” have become the hot and important topics in material science research at present. Such research broadens the range of materials used to make mechanical products, from traditional safe, bulky, expensive to safe, lightweight, durable and economical. How to properly choose this material, this article gives a review. A wide range of polymer materials. In general,