大截面ZA27锌合金蜗轮的双重挤压铸造  

Double Extrusion Casting of Large Section ZA27Zinc Alloy Worm Gear

作　　者：陈家坚 朱权利[2] 夏勇[2] 吴资涌 Chen Jiajian;Zhu Quanli;Xia Yong;Wu Ziyong(Guangdong Yuehai Huajin Technology Co.,Ltd.;School of Mechanical and Automotive Engineering,South China University of Technology)

机构地区：[1]广东粤海华金科技股份有限公司,广州511356 [2]华南理工大学机械与汽车工程学院

出　　处：《特种铸造及有色合金》2020年第9期991-993,共3页Special Casting & Nonferrous Alloys

摘　　要：利用自制的双重挤压机制备了大截面锌合金蜗轮,通过金相显微镜及万能试验机研究了其显微组织和力学性能,并对其截面的针孔度进行评定。试验选取的ZA27蜗轮挤压铸造工艺参数:浇注温度为600~650℃,模具预热温度为200~250℃,合模速度为5~10mm/s,主副冲头在比压为70~100MPa下同时保压50~100s后,副冲头在50~70MPa比压下开始施压蜗轮轮缘,并保压50~120s。结果表明,双重挤压铸造可获得组织及性能均匀的ZA27蜗轮,相比重力铸造,蜗轮抗拉强度提高了27%,伸长率提高了100%,针孔度提高了1个等级以上。The microstructure and mechanical properties of large section zinc alloy worm gear were investigated by metallographic microscope and universal testing machine,and the pin-hole degree in the section face of the double-squeezing castings was evaluated.The optimized double extrusion casting process parameters of ZA27worm wheel selected were presented as follows:holding temperature of 600~650℃,mold preheating temperature of 200~250℃,mold closing speed of 5~10mm/s,main and auxiliary punch at the specific pressure of 70~100 MPa for 50~100sand then auxiliary punch at the specific pressure of 50~70MPa began to pressurize the worm wheel flange for 50~120s.The results show that ZA27worm gear with uniform microstructure and properties can be obtained by double extrusion casting.Compared with those of ones by gravity casting,the tensile strength and elongation of double extrusion worm gear are increased by 27%and by 100%,respectively,and the pinhole degree is increased by more than 1grade.

关 键 词：大截面 锌合金蜗轮 双重挤压铸造 

分 类 号：TG146.13[一般工业技术—材料科学与工程] TG249.28[金属学及工艺—金属材料]