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Optimizing green sand properties of fluidized sand from aeration and developing new green sand testing technique.

机译：通过曝气优化流化砂的绿砂性能，并开发新的绿砂测试技术。

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摘要

Aeration sand filling is a new molding technique in foundry. Using this technique, sand with smooth flow can be filled in any orientation and shape using low-pressure air. This is not possible by conventional gravity and high-pressure blow filling techniques. Aeration was introduced as an energy-efficient and environmentally-friendly sand molding technique. In addition, aeration has its niche on quality of molds it could produce. Friability, one of the crucial green properties for the quality mold was significantly low in aeration in comparison to the gravity and high-pressure blow filling. The fluidization action in aeration acted upon the sand clay interfaces and created the interactions with them, and induced better surface abrasive property. In other words, aeration lowered the friability in the green sand allowing a lower compactibility levels in green sand molding, which was not possible with the conventional molding techniques. The range of 30-35% was suggested as the optimal working range of compactibility for aeration molding technique for selected sand and clay composition.;Advance cone jolt and thermal erosion tester were developed and used to examine the green sand properties of the foundry sand. Advance cone jolt was sensitive to the clay composition and contamination in green sand, whereas thermal erosion tester demonstrated its relevance in evaluating mold surface behavior at an elevated temperature. Thermal erosion test displayed less sand erosion in the molds built in the aeration.;Green sand in aeration was benefited by the favorable clay orientation. Homogeneous and isotropic distribution of clay platelets occurred during fluidization, which produced a better clay coating on the sand grains and increased the grain to grain bonding. Scanning electron microscope displayed a uniform clay coating and universal micro-tribometer showed greater bonding strength in the surface of the molds produced in aeration. Casting trial along with the relevant standard AFS tests for green sand properties were carried out, and analyzed using design of experiments and statistical tools.
机译：充气砂填充是铸造厂中的一种新成型技术。使用此技术，可以使用低压空气以任何方向和形状填充流动顺畅的沙子。传统的重力和高压吹气填充技术无法做到这一点。引入曝气是一种节能环保的砂型成型技术。此外，曝气在可以生产的模具质量上也占有一席之地。易碎性是优质模具的关键绿色特性之一，与重力和高压吹填相比，其通气性明显较低。曝气中的流化作用作用在砂土界面上并与其产生相互作用，并产生更好的表面磨料性能。换句话说，通气降低了生砂中的脆性，从而降低了生砂成型中的压实度，这是常规成型技术不可能实现的。建议在30-35％的范围内作为选定砂和粘土成分的充气成型技术的可压实性的最佳工作范围。;开发了先进的锥震和热侵蚀测试仪，并用于检验铸造砂的生砂性能。先进的圆锥形震动对粘土成分和生沙中的污染物敏感，而热蚀测试仪证明了它在评估高温下模具表面行为方面的相关性。热蚀试验表明，在曝气池中构建的模具中的沙蚀较少。;曝气池中的绿砂得益于良好的粘土取向性。流化过程中发生了粘土薄片的均质和各向同性分布，这在砂粒上产生了更好的粘土涂层，并增加了粒粒之间的结合。扫描电子显微镜显示出均匀的粘土涂层，通用的微摩擦计显示出在充气过程中产生的模具表面更大的结合强度。进行了铸造试验以及有关绿砂性能的相关标准AFS测试，并使用实验设计和统计工具进行了分析。

著录项

  • 作者

    Paudel, Ananda Mani.;

  • 作者单位

    Western Michigan University.;

  • 授予单位 Western Michigan University.;
  • 学科 Engineering Industrial.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 287 p.
  • 总页数 287
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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