论文部分内容阅读
ES挤压极限图(挤压速度-温度机制)能够描述挤压剪切工艺参数对棒材质量的影响,并可优选挤压-剪切工艺参数,本文建立了AZ31镁合金的三维有限元热力耦合模型及计算机仿真条件,模拟了不同挤压速度和预热温度下,ES挤压过程的模口的温度演变和挤压力随时间演化规律,通过对模拟结果数据的线性拟合得到一系列的方程,根据这些方程初步建立了挤压比为32.1时的连续挤压剪切极限图。设计并制造了适合于卧式挤压机上的ES挤压剪切模具,通过挤压工艺试验对所得的挤压极限图进行了验证,结果吻合的很好。ES挤压极限图为设计和加工模具,为生产出表面质量合格的镁合金棒材提供了理论和实践依据。
ES squeeze limit diagram (extrusion speed - temperature mechanism) can describe the impact of extrusion shear process parameters on the bar quality, and extrusion-shear process parameters can be optimized, this paper established a three-dimensional finite element thermodynamic AZ31 magnesium alloy Coupled model and computer simulation conditions were used to simulate the evolution of temperature and extrusion force of the die during ES extrusion under different extrusion speeds and preheating temperatures. The results obtained by linear fitting of the simulation results obtained a series of Based on these equations, a preliminary extrusion shear limit diagram was established initially at a compression ratio of 32.1. The ES extrusion shear mold suitable for horizontal extrusion machine was designed and manufactured. The obtained extrusion limit diagram was verified by the extrusion process test. The results were in good agreement. ES Extrusion limit diagram for the design and processing of molds for the production of surface quality of magnesium alloy bars provide a theoretical and practical basis.