单玻下方铝合金型材挤压优化设计

发布时间：2017-12-27 09:29

本文关键词：单玻下方铝合金型材挤压优化设计　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：在挤压生产过程中,铝合金型材的质量受到很多因素的影响,合理的模具结构设计与合适的挤压参数可以获得更稳定的挤压过程和生产出组织性能更好的型材。在实际挤压生产中,为了控制型材生产质量,往往通过修改工作带的长度实现对型材挤出速度的控制,然而这种方法并不能很好的解决型材扭拧、弯曲等问题,往往需要后期的反复试模、修模,严重时导致模具报废,增加了生产成本。同时挤压生产中只关注型材的成形外观是否完好,但却忽视了型材的力学性能,所以并不能保证型材的强度要求。本文针对单玻下方铝合金型材在实际生产中容易出现扭拧、翘曲等缺陷的问题,对原生产模具进行优化设计,并借助挤压仿真软件HyperXtrude进行仿真模拟。根据单玻下方型材左大右小、非对称的形状特点,在等长工作带的基础上,选择更为适合其生产的分流孔排布和焊合室形状,探讨多级焊合对挤压过程及型材质量的影响并进行挤压工艺参数的优化。通过对分流孔、焊合室的优化设计减少或避免对工作带的修改。模拟结果表明,针对型材特点选择更合理模具可以获得更好的挤压效果,即采用多级焊合更有利于单玻下方型材的生产,在多级焊合模具中,焊合室级数、体积的增加对金属流动有利,而截面积相似的焊合室增大面积后,焊合室的多级设计的影响降低,型材挤压质量最好的是前进型多级焊合模具。对于6063铝合金来说,高温挤压更能获得质量良好的型材,棒料的预热温度是影响金属流动应力的主要因素,提高棒料预热温度,可以减小金属流动应力,提高挤压最高温度,晶粒尺寸分布更为集中。综合考虑实际生产的型材质量与经济效益,应该选择使用前进型分流组合模,以480℃的棒料预热温度和11mm/s的挤压速度为挤压工艺参数,对型材质量、生产效率以及对延长模具使用寿命更为有利,更加适合应用于生产。
[Abstract]:In the extrusion process, the quality of aluminum alloy profile is affected by many factors. Reasonable die structure design and appropriate extrusion parameters can obtain more stable extrusion process and produce better profiles. In the actual production of extrusion, in order to control the quality of the production profile, often to achieve control of the extrusion speed by modifying the working length of the belt, but this method can't solve profile twisting and bending problems, often require later repeated testing and repairing mould, leading to severe die scrap, increase production cost. At the same time, it is only concerned about the shape and appearance of the profile, but it neglects the mechanical properties of the profile, so it can not guarantee the requirements of the strength of the profile. In view of the problems of twisting and warping, which are prone to appear in the actual production of single glass underneath aluminum alloy profiles, the original production mold is optimized and simulated by means of extrusion simulation software HyperXtrude. According to the shape characteristics of single glass bottom profile, small left large and right asymmetry, based on equal work belt, choose more suitable for the production of shunt holes and welding chamber shape of welding process and the influence of multi profile extrusion and extrusion quality and process parameters optimization. Through the optimization design of the diversion hole, the welding chamber to reduce or avoid to work with modifications. The simulation results show that the profile characteristics choose more reasonable extrusion mould can get better effect, which is more conducive to the multistage welding single glass below the profiles of production, in the multilevel welding mold, welding chamber series, increasing the volume in favor of metal flow, and the sectional area of the welding chamber similar to increase the area, reduce the welding chamber multilevel design, quality is the best forward extrusion type multistage welding die. For the 6063 Aluminum Alloy, high temperature extrusion can obtain good quality profiles, the preheating temperature of the bar is the main factor affecting the metal flow stress, increase the bar preheating temperature can reduce the metal flow stress, improve the extrusion maximum temperature, the grain size distribution is more concentrated. Considering the actual production of the material quality and economic benefits, should choose to use the forward type of porthole die, extrusion speed to 480 DEG C bar preheating temperature and 11mm/s for the extrusion process parameters on the quality of profiles, production efficiency and to prolong the service life of the die is more favorable, more suitable for production.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG379

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