摘要
三销轴叉精锻件是汽车等速传动系统中的关键零件,其头部内、外腔形状复杂,尺寸精度要求高,故一般采用温锻预成形+冷精整成形复合成形技术,而预成形温锻件设计不合理,在冷精整成形中,存在内腔底部薄壁处出现裂纹的问题。利用数值模拟技术,分析了三销轴叉冷精整型腔底部区域成形过程的成形力、应力、应变的变化,对预成形温锻件进行了优化,设计了不同的入模角,入模角的起始点位于内腔基准平面之上。工程实践后,优化后的预成形温锻件在冷整形后,口部内腔底部没有裂纹产生,流线连续,获得较为理想的精锻件。证明优化后的预成形温锻件,经冷精整成形后,精锻件产品质量显著提高,可有效防止裂纹产生。
Tulip cold-forming forging part is a key component of constant velocity drive shaft of car. The process of this kind of part is combined forming with warm pre-forming and cold-forming due to the complexity of interior and exterior configuration and high dimension accuracy. There is often a crack on thin wall near bottom of interior configuration during Tulip cold-forming due to unoptimizable warm pre-forming part. The warm prc-forming part was optimized and different entering die degrees starting and ending in the interior base plate were designed by analyzing changes of forming force, stress and strain in forming of bottom of interior configuration during Tulip cold-forming with the numerical simulation technique. Engineering trial with improved pre-forming forging part has proved that the crack of bottom was avoided and the flow was continues. The improved warm pre-forming part via cold-sizing had high quality. The crack can be effectively prevented.
出处
《精密成形工程》
2018年第1期177-180,共4页
Journal of Netshape Forming Engineering
关键词
三销轴叉
冷精整
裂纹
预成形
入模角
tulip
cold-forming
crack
pre-forming
entering die degree
