塑料模具钢大模块生产工艺分析  

Manufacture Process Analysis of Heavy Die Block for Plastic Mould Steel

作　　者：李雄[1] 张玉龙[2] 续维[3] 薄鑫涛[4] 

机构地区：[1]宝钢股份特钢事业部技术中心,上海200940 [2]宝钢研究院,上海201900 [3]宝钢股份特钢事业部制造部,上海200940 [4]宝钢股份特钢事业部锻造厂,上海200940

出　　处：《材料工程》2011年第1期53-56,共4页Journal of Materials Engineering

摘　　要：针对国内塑料模具钢大模块探伤合格率不高的问题,分析了国内外的制造工艺,指出了目前浇注、锻造、热处理过程中可能出现的问题。结果表明:真空上注法可以改善铸锭心部组织的致密性,通过辅助手段可以提高上注法的表面质量;锻造加热温度的高低应视锭坯的内部质量和锻造设备吨位而定,保证钢锭心部变形有利于钢锭心部缺陷愈合,锻后快冷会增加内应力从而使得缺陷变得严重;鉴于大模块的去氢退火效果不佳,氢的去除放在冶炼和浇注阶段较为合理;淬火前的软化退火或去应力退火以及淬火后不少于2次的回火有利于阻止裂纹的萌生和扩展。Aiming at low qualification rate based on ultrasonic detection,the foreign and domestic manufacture processes for heavy die block of plastic mould steel were analyzed,and domestic current teeming,forging and heat treatment processes were perhaps imperfect.The results show that the vacuum top-pouring can make internal microstructure to be more compact contrasted with bottom-pouring and enhance ingot surface quality by supplementary means,to determine forging temperature should be according to internal quality of ingot and forging equipment tonnage,increasing internal deformation can cause healing of internal defects of ingot,whereas quick cooling after forging can make existing defects to become more serious.In view of poor effects of the dehydrogenation annealing of heavy die blocks,removal of hydrogen on the smelting and the teeming stages is more reasonable.It is conducive to preventing crack initiation and propagation for soft or stress relief annealing before quenching and at least two temperings after quenching.

关 键 词：塑料模具钢 大模块 浇注 锻造 热处理 

分 类 号：TG111.7[金属学及工艺—物理冶金]