LY12合金翼片等温模锻的缺陷分析

DEFECTS ANALYSIS OF LY12 ALLOY WING IN ISOTHERMAL FORGING

简要叙述了大型薄腹板筋型翼片件,在5×10~4kN液压机上采用等温模锻工艺方案的可行性和等温模锻的变形温度、应变速率等工艺参数。分析了翼片等温模锻时产生穿筋、缩孔、折叠和裂纹等各种缺陷的原因。经试验确定了消除各种缺陷的实用方法,选择合理的模具结构设计和最佳的坯料外形、尺寸制备等。用CAD方法可得到较为理想的等效高度坯料和模具型槽中设计较为实用而又经济的工艺余料孔。

The paper briefly describes the geometric structure characteristics of large wing with thin webs, and the possibility of isothermal forging technology of wing is used in 5 × 104 kN hydraulic press. The technological parameters of isothermal forging such as its deformation temperature, strain rate and so on are introduced. The paper also analyses the causes of defects in detail such as pierce rib, strinkage cavity, lap and crack, and so on. The practical methods to remove these defects by lots of technological tests are given. Meanwhile, it points out that in order to avoid or reduce the defects, it is important to determine the die structure, optimum shapes and size of blank in the small serial production with the help of CAD. The suitable equivalent height blank and the practical and inexpensive holes for excess metal in dies cavity can be obtained.