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孔隙率对模型制作的重要性?

来源:六合历史开奖记录    发布时间:2020-02-13 21:59:38    点击:

由于铝合金具有简单的氧化和吸气倾向,熔炼过程又直接与炉气或外部大气接触,因此,熔炼过程中的控制假如有点不妥,铝合金很轻易吸收气体而形成气孔,更常见的是针孔。针孔通常是指铸件在1mm以下的析出孔,多为圆形,分布在整个铸件截面上不均匀,特别是在铝合金压铸件的厚截面和冷却速率较小的零件上。根据铝合金析出孔的分布和形状特征,可以将针孔分为三类。
  As aluminum alloy has a simple oxidation and aspiration tendency, and the smelting process directly contacts with furnace gas or external atmosphere, if the control in the smelting process is a little improper, aluminum alloy is easy to absorb gas and form pores, the most common is pinholes. Pinhole usually refers to the precipitation hole of the casting below 1mm, which is mostly round and distributed unevenly on the whole casting section, especially on the parts with thick section and low cooling rate of aluminum alloy die casting. According to the distribution and shape characteristics of the precipitated pores in aluminum alloy, pinholes can be divided into three types.
  1. 网状针孔:在低功耗的组织中,针孔紧密相连,形成一个网络,其中有几个大孔。计算单位面积上的针孔数量不方便,测量针孔直径也比较困难。
  1. Mesh pinhole: in low-power organizations, pinholes are closely connected to form a network, including several large holes. It is not convenient to calculate the number of pinholes per unit area, and it is also difficult to measure the diameter of pinholes.
  2. 点状针孔:低倍组织针孔圆点状,针孔轮廓清晰,不连续,每平方厘米面积上可计数针孔数目,可测量其直径。这种针孔易与缩孔、缩松区别。
  2. Punctate pinhole: low power tissue pinhole is round and punctate, with clear contour and discontinuity. The number of pinholes per square centimeter area can be counted and its diameter can be measured. This kind of pinhole is easy to be distinguished from shrinkage cavity and shrinkage cavity.
  3.综合气孔:为点状针孔和网状针孔的中间型。从低组织的角度看,大针孔较多,但多为多边形而非圆形和点状。
  3. Comprehensive pore: it is the middle type of punctate pinhole and reticular pinhole. From the point of view of low organization, there are many large pinholes, but most of them are polygonal rather than circular and punctate.
六合历史开奖记录_山东铝合金压铸

  铝合金压铸生产实践证明,吸入铝合金形成的气孔主要气体成分是氢气。材料也不例外,各种成分的铝合金轻易产生针孔。
  The production practice of aluminum alloy die casting has proved that the main gas component of the air hole formed by suction aluminum alloy is hydrogen. Materials are no exception, various components of aluminum alloy easily produce pinholes.
  以上就是山东铝合金压铸对孔隙率的详细介绍,想要了解更多请点击官网
  The above is the detailed introduction of porosity of Shandong Aluminum alloy die casting. For more information, please click
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