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Development of in-mold assembly methods for producing mesoscale revolute joints.

机译:开发用于生产中尺度旋转接头的模内组装方法。

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摘要

In-mold assembly is a promising process for producing articulated joints. It utilizes injection molding to automate assembly operations, which may otherwise require high labor times for production. Since injection molding is a high throughput process, in-mold assembly holds considerable promise in bulk production of assembled parts. However, current in-mold assembly methods cannot be used for manufacturing in-mold assembled products at the mesoscale. This is because the process changes considerably when the sizes of the molded parts are reduced. The premolded component in a mesoscale joint consists of miniature features. Hence, when a high temperature, high pressure polymer melt is injected on top of it, it is susceptible to plastic deformation. Due to presence of a mesoscale premolded component which is susceptible to deformation, traditional shrinkage models alone can not be used to characterize and control the clearances. This dissertation identifies and addresses issues pertaining to in-mold assembly of revolute joints at the mesoscale. First, this dissertation identifies defect modes which are unique to in-mold assembly at the mesoscale. Then it develops mold design templates which can be used for manufacturing in-mold assembled mesoscale revolute joints. Further, issues related to the deformation of the mesoscale premolded component are identified. Two novel mold design solutions to realize mesoscale in-mold assembled revolute joints are presented. The first involves use of mold inserts to constrain the premolded component to inhibit its deformation. The second involves use of a bi-directional flow of the polymer melt over the premolded component to balance the deforming forces experienced by it. Finally, methods to predict and control clearances that would be obtained in mesoscale in-mold assembled revolute joints are presented. To demonstrate the utility of the tools built as part of this research effort, a case study of a miniature robotic application built using mesoscale in-mold assembly methods is presented. This dissertation provides a new approach for manufacturing mesoscale assemblies which can lead to reduction in product cost and create several new product possibilities.
机译:模内组装是生产关节接头的有前途的过程。它利用注塑成型使装配操作自动化,否则可能需要大量的劳动时间进行生产。由于注塑成型是高产量的过程,因此模内组装在组装零件的批量生产中具有广阔的前景。但是,当前的模内组装方法不能用于以中等规模制造模内组装产品。这是因为当减小模制零件的尺寸时,该过程会发生很大变化。中尺度接头中的预成型组件具有微型特征。因此,当高温高压聚合物熔体注入到其顶部时,它容易发生塑性变形。由于存在容易变形的中等尺寸的预成型组件,因此传统的收缩模型不能单独用于表征和控制间隙。本文确定并解决了与中尺度旋转关节模内组装有关的问题。首先,本文确定了中等尺度下模内组装所特有的缺陷模式。然后,开发模具设计模板,该模板可用于制造模内组装的中尺度旋转接头。此外,确定了与中尺度预成型部件的变形有关的问题。提出了两种新颖的模具设计解决方案,以实现中等规模的模内组装旋转接头。第一个涉及使用模具插件来约束预成型的部件以抑制其变形。第二个涉及使用聚合物熔体在预成型组件上的双向流动来平衡它所经历的变形力。最后,介绍了预测和控制间隙的方法,该间隙将在中等规模的模内组装旋转接头中获得。为了演示作为这项研究工作一部分而构建的工具的实用性,本文介绍了使用中型模内组装方法构建的微型机器人应用的案例研究。本论文为中尺度组件的制造提供了一种新方法,可以降低产品成本并创造出几种新的产品可能性。

著录项

  • 作者

    Ananthanarayanan, Arvind.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:38:22

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