铝合金MIG电弧快速成形工艺研究

发布时间：2018-05-02 20:14

本文选题：铝合金 + 电弧快速成形　；参考：《北京石油化工学院》2017年硕士论文

【摘要】：电弧快速成形技术以电弧为热源将金属丝材熔化,可以快速成形致密度高、力学性能好的复杂结构件。相比高能束快速成形,电弧快速成形具有成形设备简单、成本低、效率高、成形质量好等优点,但成形件表面粗糙,通过改善工艺参数及成形方法来提高成形质量表现出了很大的研究空间。本文以5356铝合金焊丝为成形材料,基于MIG焊接进行铝合金快速成形试验,研究不同工艺参数对单层及多层成形下成形件成形质量的影响规律,并对侧壁成形方式进行了探索研究。焊接电流和成形速度是影响成形质量的主要因素,适当的预热有助于焊道的成形。通过单层单道成形试验,测量不同焊接电流、成形速度及预热温度下焊道熔宽及余高,分析总结各工艺参数对单层单道成形质量的影响规律。根据快速成形轨迹理想模型,以典型薄壁件成形方式为例,进行多层单道成形试验研究,分析不同焊接电流、成形速度及层间冷却时间对薄壁件宏观尺寸及表面粗糙度的影响规律,并对成形试样进行微观组织及力学性能的检测。在理想搭接状态模型的基础上,利用单层单道及多层单道的试验结果,探索四种不同侧壁成形方式对试样表面成形质量的影响规律,通过成形试样平整度及表面粗糙度判定成形效果,获得侧壁成形的最优方法。
[Abstract]:Arc rapid prototyping technology uses arc as heat source to melt metal wire, which can rapidly form complex structure with high density and good mechanical properties. Compared with high energy beam rapid prototyping, arc rapid prototyping has the advantages of simple forming equipment, low cost, high efficiency and good forming quality. By improving the process parameters and forming methods to improve the quality of forming shows a lot of research space. In this paper, 5356 aluminum alloy wire is used as the forming material, and the rapid prototyping test of aluminum alloy based on MIG welding is carried out. The influence of different process parameters on the forming quality of the forming parts under single-layer and multi-layer forming is studied. The sidewall forming method is also studied. Welding current and forming speed are the main factors affecting forming quality. The weld width and residual height were measured under different welding current, forming speed and preheating temperature by single pass forming test. The influence of process parameters on single pass forming quality was analyzed and summarized. According to the ideal model of rapid prototyping trajectory, taking typical thin-walled parts as an example, the multi-layer single-pass forming test was carried out, and the different welding currents were analyzed. The effects of forming speed and interlaminar cooling time on the macroscopic size and surface roughness of thin-walled parts were studied. The microstructure and mechanical properties of the formed specimens were examined. Based on the ideal lap state model, the effects of four different sidewall forming methods on the surface forming quality of the specimens are explored by using the experimental results of single-layer single-pass and multi-layer single-pass. The optimum method of sidewall forming is obtained by judging the forming effect by the flatness and surface roughness of the forming specimen.
【学位授予单位】：北京石油化工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG444.74

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