摘要
材质为HT250和HT300的汽车发动机缸体,通常壁厚δ=（5±1）mm;而轻量化则设计为δ=（3.5±0.7）mm。为解决轻量化缸体易出现浇不足、冷隔、气隔、飞溅铁豆、铁液交汇产生的裂纹状冷隔纹路等铸造缺陷,生产中采用立浇底注工艺,浇注系统设计陶瓷过滤片,使洁净的高温铁液平稳充型;采用高CE（3.90%~4.20%）,并加入适量的Cr、Cu、Sn、Mo、Ni等合金元素,强化孕育,杜绝薄壁处出现白口或麻口组织,同时使薄壁处的力学性能和金相组织满足要求。
The wall thickness of engine cylinder block of HT250 or HT300 is usually（5±1） mm. But to lighten the mass of engine cylinder block, the wall thickness is designed as（3.5±0.7） mm. To solve the casting defects such as pouring shortage, cold traps, air gap, splash iron beans, crack-like cold shut in lightweight engine cylinder block in production, the processes of vertical casting from bottom gating, setting ceramic filter piece in gating system, smooth filling with clean high-temperature molten iron were used combining with high-CE（3.90% ~ 4.20%）, and adding the right amount of alloying elements Cr, Cu, Sn, Mo, Ni and so on, so as to strengthen inoculation and eliminate white or hybrid structure in the thin-walled office, make the mechanical properties and microstructure in the thin-walled office meet the requirements. The castings with desirable quality were produced.
出处
《铸造技术》
CAS
北大核心
2014年第4期822-825,共4页
Foundry Technology
关键词
灰铁缸体
薄壁
立浇工艺
高碳当量
孕育
gray iron cylinder block
thin wall
verticel pour processing
high CE
inoculation
