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造成铝压铸件收缩条件都有哪些?

来源:http://www.jnhjgs.cn     发布时间:2020-02-17 20:09:48    点击:

1. 布局用锌合金压铸
  1. Zinc alloy die casting for layout
  由于锌压铸件太厚,导致缩松,进给不良。铸件壁厚不均匀,在厚壁处出现一些热缩缩孔。
  The zinc die casting is too thick, which leads to shrinkage and poor feeding. The wall thickness of the casting is not uniform, and there are some heat shrinkable holes in the thick wall.
  因为压铸锌孔的直径在砂芯太小,形成一个铸造洞是一个热金属液体加热,在长期高温条件下,减少冷凝率、锌压铸金属孔一起出现,气体或大气压力砂芯的供应渠道,导致收缩孔和孔壁攻击松。
  Because the diameter of the die-casting zinc hole is too small in the sand core, forming a casting hole is heated by a hot metal liquid. Under the long-term high temperature condition, reducing the condensation rate and the appearance of the zinc die-casting metal hole together, the supply channel of the gas or atmospheric pressure sand core results in the attack of the shrinkage hole and the hole wall.
山东铝合金压铸

  2. 锌压铸技术规划
  2. Technical planning of zinc die casting
  (1)指导方针和铸造系统设计不合理,锌合金压铸件的铸造系统和规划比较及时,容易造成铸件缩孔缩松的病害。铸件的主要性能不符合凝固顺序,浇口尺寸和范围不正确。对于灰铸铁和球墨铸铁,如果门开在铸件较厚的部位,再加上内部的刹车片厚度,浇注后的门长期处于液态。在铁水的石墨化膨胀过程中,会发生凝固,将铁水从内浇口浇出,导致铸件出现缩孔缩松。
  (1) The design of the guideline and the casting system is not reasonable, and the casting system and planning of zinc alloy die casting are timely, which is easy to cause the defects of shrinkage cavity and porosity. The main properties of the casting do not conform to the solidification sequence, and the gate size and range are not correct. For gray cast iron and nodular cast iron, if the door is opened at the thicker part of the casting, plus the thickness of the internal brake pad, the gate after pouring will be in liquid state for a long time. In the process of graphitization and expansion of molten iron, solidification will occur, and the molten iron will be poured out from the inner gate, resulting in shrinkage cavity and porosity of the casting.
  (2)冒口范围、数量、水垢、冒口颈垢的规划不合理,不能促进铸件的订单凝固,导致铸件缩孔缩松的发生。如果把排气口的排气口不放在暗冒口的顶部,使用冷水机不合适,会造成铝压铸件的缩孔、缩松病。
  (2) The unreasonable planning of riser range, quantity, scale and riser neck scale can not promote the order solidification of castings and lead to the occurrence of shrinkage and porosity of castings. If the exhaust port of the exhaust port is not placed on the top of the dark riser, the improper use of the water chiller will cause the shrinkage cavity and porosity of the aluminum die casting.
  (3)砂芯、砂芯(砂芯)的耐火和高温强度过低、热变形过大的原因。当液态金属静压或石墨化膨胀的壁时,芯壁或攻击会移动。目前铸件实际需要增加或补充新部位的缩孔膨胀是热点,导致了锌压铸件缩孔缩松的攻击。这种表示法对大中型压铸件非常敏感。否则,如果型砂含水率过高,就会使壁厚变薄,水-干-水的凝结面积出现增大,使水垢扩大,使手机可加到墙体上,导致收缩和侵蚀。
  (3) The reasons for the low fire resistance, high temperature strength and large thermal deformation of sand core and sand core (sand core). When the liquid metal static pressure or graphitized expanded wall, the core wall or attack will move. At present, it is a hot spot to increase or supplement the shrinkage expansion of new parts, which leads to the attack of shrinkage porosity in zinc die casting. This representation is very sensitive to large and medium-sized die castings. Otherwise, if the water content of molding sand is too high, the wall thickness will become thinner, the condensation area of water dry water will increase, the scale will expand, the mobile phone can be added to the wall, resulting in shrinkage and erosion.
  铸造加工方法
  Casting processing method
  从压铸工艺的技术原理来看,铸件出现缩孔缺陷,只能通过工艺来解决。铸态冷凝缩短了相变过程,这是一种自然的物理现象,我们不能改变这一规律的自然表述,只能遵循它的规律来处理。
  From the technical principle of die casting process, the shrinkage defects of castings can only be solved by the process. As cast condensation shortens the transformation process, which is a natural physical phenomenon. We can't change the natural expression of this law, we can only follow its law to deal with it.
  补料路径会收缩,补料压铸有两种方式,一种是自然补料,一种是强制补料。为了完成自然进料,我们的铸造工艺系统将有技术手段来完成冷凝的“顺序”。很多人直观的认为低压铸件的收缩率的选择可以解决铸件的收缩缺陷,但事实并非如此。采用低压铸造技术并不意味着低压铸造系统可以缩小铸件缺陷孔的处理。如果不对工艺和方法进行补偿和收缩,低压铸造生产的毛坯也能将缺陷的存在缩小100%。
  There are two ways of feeding die casting, one is natural feeding, the other is forced feeding. In order to complete the natural feeding, our casting process system will have technical means to complete the "sequence" of condensation. Many people intuitively think that the choice of shrinkage rate of low-pressure castings can solve the shrinkage defects of castings, but it is not the case. Using low-pressure casting technology does not mean that the low-pressure casting system can reduce the treatment of casting defects. If the process and method are not compensated and contracted, the defect of the blank produced by low pressure casting can be reduced by 100%.
  以上就是山东铝合金压铸对造成铝压铸件收缩条件的详细介绍,想要了解更多请点击官网http://www.jnhjgs.cn
  The above is a detailed introduction to the shrinkage conditions of aluminum die casting. For more information, please click http://www.jnhjgs.cn
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