摘要
采用数值模拟与实验相结合的方法,对气门毛坯的楔横轧-模锻工艺过程进行研究,依据气门毛坯楔横轧成形工艺及终锻成形工艺的要求设计了不同过渡圆角半径的预成形毛坯,采用有限元软件进行数值模拟。分析其成形工艺过程中坯料的金属流动规律、不同过渡圆角半径的坯料所需最大成形载荷,并研究成形过程中坯料与凹模的接触情况。研究结果表明,与锻件过渡圆角相比,毛坯圆角半径与锻件圆角半径越接近,综合效果越好;当毛坯圆角半径过小时,所需的成形载荷也较小,但毛坯过渡圆角处的氧化皮难以清除,且会出现较浅的挤压痕迹;当毛坯圆角半径过大时,成形载荷也越大,产生严重的挤压痕迹,使模具产生严重的磨损,从而降低模具的使用寿命。
The process of cross wedge rolling and final forging for valve blank was studied by the method of numerical simulation combined with practice. According to the requirement of cross wedge rolling process and the final forging process of valve blank, several kinds of preformed blanks with different transition fillet radii were designed, and the final forging process was simulated by the finite element soft- ware. Some deforming regulations of metal flow, the maximum forming load of the billet with different transition fillet final and the contact conditions of the blank and the concave die were analyzed. The results show that compared with the transition fillet radius of the forging part, the closer is the fillet radius of the blank and the forging part, the better is the comprehensive effect. When the fillet radius of the blank is too small, the forming load becomes smaller, but the oxide skin of the blank transition fillet radius is difficult to be removed and a shallow extrusion traces occurs. In addition, the larger is the blank fillet radius, the greater is the forming load. The extrusion traces are deeply produced and the mold will be seriously worn, and thereby the die life will be shortened.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第3期16-21,共6页
Forging & Stamping Technology
基金
广东省"扬帆计划"引进创新创业团队专项资助项目(201312G02)
佛山市科技创新专项基金资助项目(2013GQ100413)
关键词
气门毛坯
楔横轧
终锻
数值模拟
valve blank
cross wedge rolling
final forging
numerical simulation
