提高四流圓坯連鑄機鑄坯質量的改造實踐

Revamp of 4-strand Round Casting Machine to Improve Billet Quality

摘要: 分析了某公司四流圓坯連鑄機鑄坯易出現表面裂紋、凹坑和澆鑄拉漏等問題的原因，提出采用電動缸振動裝置替代帶偏心輪的四連桿機構、新增結晶器電磁攪拌等措施，對該連鑄機進行改造。實踐證明：四流圓坯連鑄機改造后，出現表面裂紋、凹坑的鑄坯數量明顯減少，漏鋼率從0.18%降至0.07%，鑄坯中心等軸晶率顯著提高，驗證了技術改造措施的正確性。

Abstract: Analyzed are the causes for the common quality problems as staying with the company’s 4-strand round casting machine like surface-borne crack and pit，and frequent breakout. As a result，the revamp proposal is made and implemented，which mainly includes measures like replacing the eccentric gear 4-bar linkage vibrating mechanism with an electric cylinder vibrator，and adding a mould electromagnetic stirring device. Thanks to the revamp，the after-revamp operation of the casting machine shows that the proportion of billets with surface cracks and pits is remarkably reduced，the breakout rate is decreased from 0.18% to 0.07%，and the billet central equiax crystal rate is obviously enhanced，which proves the correctness of the above mentioned technical revamp measures.