论文部分内容阅读
采用弯曲镦锻法锻造中高速柴油机曲轴时,曲轴锻件曲柄臂安装面极易出现塌角缺陷。针对平衡块安装面为平面类型的曲柄臂,以16V240曲轴为研究对象,设计了4种平衡块安装面形状的曲柄臂锻件,并采用有限元法模拟了16V240曲轴锻件4种方案的RR法镦锻成形过程。从镦锻过程金属坯料的流动速度和速度矢量方向两个方面讨论了4种平衡块安装面形状对曲柄臂锻件成形质量的影响,模拟结果表明,设计为收敛形状的平衡块安装面在锻造过程中能有效避免塌角缺陷。根据方案4的模拟结果优化设计了模具并进行了曲轴单拐的挤压实验,实验结果与数值模拟结果基本一致。
Forging medium and high speed diesel engine crankshaft by bending upsetting method, crankshaft forging crankshaft mounting surface prone to collapse defects. Aiming at the crankshaft with balance block mounting surface of planar type, four types of crank arm forgings with balance weight mounting surface were designed with 16V240 crankshaft as the research object. The finite element method was used to simulate the four methods of 16V240 crankshaft forging, Forging process. The influence of the shape of four kinds of counterweight mounting surfaces on the forming quality of crank arm forgings is discussed from two aspects of the flow velocity and the velocity vector direction of upsetting metal billet. The simulation results show that the counterbalanced block mounting surface designed in the process of forging In the can effectively avoid the collapse of defects. According to the simulation result of the scheme 4, the mold is designed and the squeeze test of the single crankshaft is carried out. The experimental results are in good agreement with the numerical simulation results.