【作者】 高博；

【导师】 周廷美；

【作者基本信息】 武汉理工大学 ， 机械设计及理论， 2010， 硕士

【摘要】 瓦楞纸箱因其缓冲保护性能良好从而广泛应用于产品的外包装。随着瓦楞纸箱市场需求的不断增加以及生产规模的迅速扩大,在市场竞争日趋激烈的同时也暴露出诸多与其生产过程直接相关的质量问题,目前在生产故障发生后通常只是采用根据经验对相应设备进行调整这种缺乏充分理论支持的做法。因此就生产过程中工艺参数等因素对瓦楞纸箱强度性能的影响以及瓦楞纸箱成型机理进行全面深入的研究将有助于发现瓦楞纸箱加工过程中可能出现的问题并优化瓦楞纸箱的生产,从而为改进瓦楞纸箱的设计和生产工艺的改进提供理论依据。瓦楞纸板的压痕与折叠是瓦楞纸箱的成型过程的最主要工序,压痕与折叠对纸板属于大位移和大变形的过程并且同时涉及到压痕设备、压痕力、压痕深度等诸多决定纸箱生产质量的关键环节的因素。针对压痕与折叠过程中容易出现纸板卷曲或压线破裂等故障现象,本文在考虑瓦楞纸板材料非线性和几何非线性的基础上选择了某型号单瓦楞纸板,采用ANSYS参数化设计语言就瓦楞纸板机械方向和正交方向运用接触分析技术建立了压痕与折叠工艺的3维有限元模型并对瓦楞纸板的压痕及折叠过程进行了仿真,得出了瓦楞纸箱成型过程中纸板的变形情况、纸板的应力分布情况及压痕力与折叠力矩的变化情况。仿真结果表明经压痕后的瓦楞纸板的强度、压痕力与折叠力矩基本随纸板变形增大而增加但呈非线性变化。在对工艺过程进行仿真的基础上就不同压痕线宽、压痕力及压痕深度等参数的变化对纸板压痕的影响进行了研究,得出了上述工艺参数变化时瓦楞纸板压痕区的力学性能的一些规律性特征并就有限元分析中发现的一些典型故障进行了讨论。最后将压痕、折叠及纸板的粘合与撑开成箱等工序进行整合从而建立了完整的瓦楞纸箱成型过程的仿真模型并得到了纸板的相应的变形情况,为进一步的研究奠定了基础且对瓦楞纸箱及类似包装容器成型过程和成型机理的研究具有一定的参考价值。更多还原

【Abstract】 Corrugated boxes are widely used in packaging as they function well in protecting products. With continuous growth of market requirements of corrugated boxes, the production scale enlarges fast, while lots of quality problems arise as market competition becomes increasingly fierce. The solution after failure emerges is currently merely to adjust relative equipments according experiences which lacks convincing theoretical support. Thus to research comprehensively and thoroughly on influences of technological parameters on mechanical performance of boxes as well as the mechanism of shaping of corrugated boxes help find possible problems during producing process and to optimize corrugated boxes production, theoretical bases of improvements of corrugated boxes design and production then offered.During the corrugated boxes shaping process, creasing and folding of corrugated board both have large displacement and large deformation process with creasing equipments, together with creasing force and depth etc. involved, makes the chief and critical procedures where production quality relies on. Pointing against warping or fracture and other failure phenomena emerged during creasing and folding, a certain type of triple wall corrugated board was chosen to build a 3-dimensional finite element model by means of ANSYS parametric design language considering material nonlinearity and geometry nonlinearity of the board. Contact analysis techniques are used to simulate the two processes, and deformation map as well as stress distribution map together with creasing force and folding moment was presented. It is indicated that the board after creasing is safe in strength, and creasing force as well as folding moment basically rises as the deformation becomes larger but not changing linearly.Influences on creased board from changes of parameters like different creasing steel wire width, creasing force and depth are researched based on the realization of technological simulation, and several regular traits of mechanical features around creased areas of the board were drawn. Typical failure discovered during the finite element analysis was discussed. At last creasing-folding-gluing and raising process are integrated to make a full model of shaping process of corrugated boxes, and relative deformation maps of the corrugated board used were drawn, which offers a foundation for further study and reference value in research of the shaping process and mechanism of corrugated boxes and other similar kinds of packaging containers.更多还原