摘要
针对228型汽车转向泵Al-10Si铸件金属型铸造存在的渣孔、缩松及针孔等缺陷,研究了合金熔体处理工艺对转向泵铸件金属型铸造缺陷和力学性能的影响。试验表明,Al-Ti-C+Al-Sr复合变质比Al-Ti-B+Al-Sr复合变质有更好的晶粒细化效果,使铸件的抗拉强度提高了10%,伸长率提高了40%～50%;在Al-10Si合金熔体的精炼净化处理方面,旋转精炼气泡浮游法比熔剂法有更强的除渣、除气能力。旋转气泡浮游法在转速为400r/min、气体流量为5L/min、旋转精炼15min、静置9min后,夹渣废品率从原来的36.2%降至1.2%以下,铸件合格率提高至97%。
Aiming at the slag inclusion, shrinkage hole and pinhole defects in 228 automobile steering pumps during metal mould casting process, the effects of melt treatment on casting defects and mechani- cal properties of 228 automobile steering pumps were investigated. The results show that the modifica- tion effects of A1-Ti-C＋ A1-Sr compound modifier are obviously superior to those of A1-Ti-B＋ A1-Sr compound modifier in refining grain size, and tensile strength and elongation of the steering pump with AbTi-C＋A1-Sr compound modifier are improved by 10% and approximately 40% ～50%, respectively. Compared with the flux method, the rotating bubble floating method exhibits the more acceptable ability to slag removal and degassing. With rotating velocity of 400 r/min, gas flow of 5 L/min and rotating re- fining for 15 rain as well as holding for 9 min, the reject rate is decreased from 36.2% to below 1.2%, and the qualified rate is increased by 97%.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第2期112-115,共4页
Special Casting & Nonferrous Alloys
