摘要
为了提高传动轴临界转速 ,要求提高传动轴管两端口尺寸精度 ,若采用传统的无芯棒缩径工艺已无法保证制造精度。本文提出一种有芯棒精密缩径开式挤压工艺 ,并应用上限理论计算方法可准确预示挤压力 ,合理设计出凹模及芯棒几何尺寸。经过上限理论分析及实验 ,得出最佳模角α=12°,最佳轴管外径 Rf=6 4.2 mm ,挤压前对轴管进行磷化皂化处理最为理想。
In order to increase the critical rotative velocity of transmission shafts, it is necessary to improve the size precision of the transmission shaft tube's two ports. The traditional non mandril reducing diameter technology can not guarantee the manufacturing precision.This article puts forward a kind of new open extrusion technology of precision reducing diameter with mandril. The extrusion stress can be predicted exactly and the geometric size of the die and the mandril can also be designed rationally with the theory of upper limit calculation. Through the method of upper limit analysis and experiments, we obtain the optimum extrusion angle of the die, α =12°, and the optimum outer diameter of the transmission shaft tube, R f =64 2 mm. Moreover, a better result can be achieved if the shaft tube is treated by phosphate process and soap process before extrusion.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2000年第3期99-101,119,共4页
Transactions of the Chinese Society for Agricultural Machinery
关键词
传动轴
精密缩径工艺
上限分析法
有芯棒
Transmission shaft, The technology of precision reducing diameter, The method of upper limit analysis
