典型文献
Simulation and experimental research on extra-squeeze forming method during gradient sand molding
文献摘要：
The flexible extrusion forming process (FEFP) is a sand mold patternless manufacturing technology that enables digital near-net shaping of complex sand molds. But, it is difficult to achieve the gradient sand molds with high surface strength and strong interior permeability by FEFP. To solve this problem, an extra-squeeze forming method based on FEFP for gradient sand mold was developed. To further reveal the extra-squeeze forming mechanism, based on the Johnson-Kendall-Roberts (JKR) theory and "gluing" notions, the single and double-sided squeeze models of gradient sand molds were established using the EDEM software. The squeezing processes of sand molds with different cavity depths of 60, 100, 140, 180, and 220 mm were systemically studied under single and double-sided squeeze conditions. The variation in the void fraction of sand mold as also investigated at a variety of extra-squeeze distances of 2, 3, 4, 5, and 6 mm, respectively. Simulation and test results show that a deeper cavity depth weakens the extrusion force transmission, which leads to a decrease in strength. The sand mold permeability and void fraction are identified to be positively correlated, while the tensile strength and void fraction appear to be negatively correlated. The void fraction of sand molds decreases with a longer extra-squeeze distance. A 6 mm extra-squeeze distance for the sand mold with 220 mm cavity depth results in a 26.8％ increase in tensile strength with only a 5.7％ reduction in the permeability. Hence, the extra-squeeze forming method can improve the quality of the sand mold by producing a gradient sand mold with high surface strength and strong interior permeability.
文献关键词：
中图分类号：
作者姓名：
Er-biao Jiang;Zhong-de Shan;Guang Cheng;Shao-zong Wang;Zhao-xian Gu;Xin-lei Wang
作者机构：
State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100044,China;Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Union University,Beijing 100101,China
文献出处：
引用格式：
[1]Er-biao Jiang;Zhong-de Shan;Guang Cheng;Shao-zong Wang;Zhao-xian Gu;Xin-lei Wang-.Simulation and experimental research on extra-squeeze forming method during gradient sand molding)[J].中国铸造,2022(04):288-298
A类：
FEFP,patternless,gluing
B类：
Simulation,experimental,research,extra,squeeze,forming,method,during,gradient,sand,molding,flexible,extrusion,manufacturing,technology,that,enables,digital,near,net,shaping,complex,molds,But,difficult,achieve,high,surface,strength,strong,interior,permeability,by,To,solve,this,problem,was,developed,further,reveal,mechanism,Johnson,Kendall,Roberts,JKR,theory,notions,single,double,sided,models,were,established,using,EDEM,software,squeezing,processes,different,cavity,depths,systemically,studied,under,conditions,variation,void,fraction,also,investigated,variety,distances,respectively,test,results,show,deeper,weakens,force,transmission,which,leads,identified,positively,correlated,while,tensile,appear,negatively,decreases,longer,increase,only,reduction,Hence,can,improve,quality,producing
AB值：
0.412688
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
