翻领制袋成型器制袋过程分析

发布时间：2018-12-30 17:59

【摘要】：翻领制袋成型器在立式成型充填封口机中应用普遍，是封口机的重要部件，对包装袋的成型质量、效率等影响重大。本文主要研究翻领制袋过程中薄膜材料上每条流线保持其形状的力学平衡问题，而制袋时薄膜材料的受力情况与成型器的参数相关，通过微分几何方法建立翻领成型器的数学模型有利于力学分析，是对薄膜制袋成型过程分析的基础。首先，，翻领制袋成型器的工作曲面为可展曲面，通常认为其肩曲面的一半是由一个单锥面形成的，记为单锥面翻领制袋成型器，本文中以圆形管单锥面翻领制袋成型器为代表，通过微分几何方法建立了其曲面曲线的数学模型，利用所推导的领口交接曲线和边界曲线的数学方程，并在三维软件中建立相应的三维曲面模型来进行验证，以用于指导设计和制造。其次，扩展了肩曲面锥面的数量，以圆形管三锥面翻领制袋成型器为研究对象，总结两锥面拼接保持可展满足的约束条件，用微分几何的理论，建立多锥面翻领制袋成型器两相邻锥面顶点及领口交接曲线方程系数之间的迭代关系，用迭代的方式求得各段领口交接曲线的方程，推导了各个锥面及其边界曲线的数学方程，并在三维软件中建立相应的三维曲面模型来进行验证，同时也对肩曲面的锥面数量趋于无穷多时，肩曲面出现切线面的情况进行了初步的探讨。最后，在微分几何建立的翻领成型器曲面数学模型的基础上，对翻领成型器各部分区域的流线建立了流线方程，并计算了肩曲面部分流线的包角、流线在交接曲线上的夹角以及肩曲面区域流线曲率的数学方程，探讨了将材料拉过翻领制袋成型器所需的拉力与摩擦系数和成型器流线曲率之间的关系，指出了改善制袋过程阻力的方法，为翻领制袋过程中材料保持其力学平衡提供一定的理论依据，对翻领制袋成型器领口交接曲线处材料偏移的原因也进行了一定的理论研究，作出了在忽略摩擦力、不考虑材料厚度及跑偏的情况下，翻领制袋过程中，材料流线是不受其它流线横向力的作用的推断。
[Abstract]:Lapel bag forming machine is widely used in vertical packing and sealing machine. It is an important part of sealing machine and has a great influence on the forming quality and efficiency of packing bag. In this paper, the mechanical balance of every streamline in the film material to keep its shape in the process of lapel bag making is studied, and the mechanical condition of the film material is related to the parameters of the moulding device. The establishment of mathematical model of lapel molder by differential geometry is beneficial to mechanical analysis and is the basis of the analysis of film bag making process. First of all, the working surface of the lapel bag maker is a developable surface, and it is generally considered that half of its shoulder surface is formed by a single cone, which is described as a single cone pocket maker. In this paper, the circular tube and single conical lapel bag maker is taken as the representative. The mathematical model of the curved surface curve is established by the differential geometry method. The mathematical equations of the neckline junction curve and the boundary curve are derived, and the corresponding 3D surface model is established in the 3D software. To guide design and manufacturing. Secondly, the number of shoulder surface conical surface is expanded. Taking the circular tube tri-cone turn-over bag maker as the research object, the constraint conditions of the two conical splicing to keep developable are summarized, and the theory of differential geometry is used. The iterative relationship between the coefficients of the two adjacent conical vertices and necklines of a multi-cone lapel bag making machine is established. The equations of the neckline transition curves are obtained by iterative method, and the mathematical equations of the conical surfaces and their boundary curves are derived. At the same time, when the number of conical surface of shoulder surface tends to infinity, the tangent surface of shoulder surface is preliminarily discussed. Finally, on the basis of the mathematical model of the turn-collar molding surface established by differential geometry, the streamline equation is established for each part of the turn-over molding, and the envelope angle of the shoulder surface is calculated. The mathematical equations of streamline angle on the junction curve and streamline curvature in shoulder and surface region are discussed. The relationship between the tension required to pull the material over the lapel bag moulder and the friction coefficient and the streamline curvature of the moulder is discussed. The method of improving the resistance of bag making process is pointed out, which provides a certain theoretical basis for the material to maintain its mechanical balance in the process of bag making of lapel. The reason of the material deviation at the neckline of the bag maker is also studied theoretically. It is inferred that the material streamline is not affected by the transverse force of other streamlines in the process of lapel bag making without considering the friction force without considering the thickness and running deviation of the material.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB486

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