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本文介绍了用灰铸铁代替合金铸铁,制造中小批量生产的拉延模中几个关键问题的研究情况:模具壁厚对铸件性能的影响,铸件组织状态及热处理工艺对铸件性能的影响以及生产应用的稳定性等。结果表明,模具壁厚小于60毫米时选用HT25—47铸铁,小于100毫米时选用HT30一54灰铸铁;控制铁水的化学成分,使铸件获得70％以上的珠光体,在退火状态下直接使用,可以较好的满足模具的各项性能要求。这样,模具材料成本可降低2/3,切削加工效率可提高15％。
In this paper, the gray cast iron instead of alloy cast iron, the production of small and medium-sized drawing dies several key issues of research: the impact of mold wall thickness on the performance of castings, the state of the castings and heat treatment process on the casting performance and application of production Stability and so on. The results show that HT25-47 cast iron is selected when the wall thickness is less than 60 mm and HT30-54 gray cast iron is selected when the wall thickness is less than 100 mm. The chemical composition of molten iron is controlled so that the castings obtain more than 70% pearlite and used directly in an annealed condition. Can better meet the performance requirements of the mold. In this way, mold material costs can be reduced by 2/3, cutting efficiency can be increased by 15%.