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基于AFDEX有限元软件,建立了某规格45°斜三通挤压成形热力耦合有限元模型,揭示了成形过程中等效应变、载荷-时间曲线和模具应力的分布规律,得到了挤压该规格45°斜三通件挤压设备吨位。研究结果显示,高应变值主要集中在坯料金属流经垂直冲头的区域;由载荷-时间曲线可知,镦粗开始后,镦粗杆的载荷先缓慢上升,之后快速增大,直到镦粗结束,成形载荷为42410 k N;反挤压开始后,随着加载过程的进行,反挤压杆的载荷迅速增大至约23000 k N,之后一段时间内相对趋于稳定,最终,成形载荷为34920 k N。结合工艺试验,镦粗和穿孔的成形载荷分别为41520和34500 k N,与模拟结果非常接近,验证了工艺方案的合理性,模具结构满足要求。
Based on the finite element software AFDEX, a finite element model of 45 ° inclined three-way extrusion forming thermal coupling was established to reveal the distribution law of equivalent strain, load-time curve and die stress in the forming process. ° oblique three-piece extrusion equipment tonnage. The results show that the high strain is mainly concentrated in the area where the blank metal flows through the vertical punch. The load-time curve shows that the load of the upsetting rod firstly increases slowly and then increases rapidly until the upsetting ends , And the forming load was 42410 kN. After the start of anti-extrusion, the load of the anti-extrusion rod rapidly increased to about 23000 kN with the loading process, and then became relatively stable after a period of time. Finally, the forming load was 34920 k N. In combination with the process tests, the forming loads for upsetting and punching were 41520 and 34500 kN, respectively, which were very close to the simulation results, which verified the rationality of the process scheme and the mold structure to meet the requirements.