(1) Entrapped stoma
原因：因为beplay全站app安卓型腔及料管（料筒、熔杯）内会有气体存在，在高速射出时，因为气体来不及排出，被紊流的铝合金包裹，存在于铸件内部，构成气孔；体现款式： 气孔内部存在压力，如加热铸件到220度左右，铸件外表会有凸起的泡泡，持续加热有时可能会有气泡声；剖开检测，孔规矩，内壁润滑，无金属光泽，有被气体 污染过的。
Reason: because there will be gas in the mold cavity and material tube (barrel and molten cup), when the gas is injected at high speed, because the gas is too late to be discharged, it is wrapped by turbulent aluminum alloy, and exists in the casting, forming the air hole; embodiment style: There is pressure inside the air hole, for example, when the casting is heated to about 220 degrees, there will be convex bubbles on the surface of the casting, and sometimes there may be bubble sound when the casting is heated continuously; when the casting is cut open for inspection, the hole is regular, the inner wall is lubricated, there is no metallic luster, and there is gas pollution.
terms of settlement
a. Before die casting, the gas in die cavity and tube can be discharged. Now, vacuum die casting and oxygen punching die casting can be used.
b. The article is made on the mould to find a way to discharge the gas in the mould cavity.
c. In the process of die-casting, invisible things are always good. A certain amount of gas exists in a certain part of the casting, which must be a defective product. We can break up the gas existing in one part through the die-casting process, divide it into several parts, and let the pores disperse.
(2) Secretory stoma
Cause: when the aluminum alloy solidifies from liquid to solid, the H dissolved in the aluminum alloy will separate to form hydrogen, which will remain in the casting to form holes.
Embodying style: split detection, inner wall lubrication, metallic luster, will exist anywhere in the casting.
terms of settlement:
a. Strictly control the melting process of aluminum liquid, and prohibit the wet and greasy materials from being put into the furnace for remelting.
b. The aluminum liquid shall not be placed for more than 6 hours, and the refining and degassing treatment shall be carried out regularly.
c. As for the central furnace, if it is not produced for more than 3 days, it is recommended that the furnace be closed, and the liquid aluminum should not be put away for a long time.
d. In humid climate, the frequency of degassing should be increased.
(3) Invasive stomata
Cause: in the process of die casting production, due to the excessive lubricating oil of punch and material pipe and the non drying of water agent release coating, these substances will vaporize immediately when touching the high temperature aluminum liquid, and these gases can not be discharged in the mold cavity and invade into the casting to form holes.
Embodiment style: it exists in the surface of the casting, sometimes there will be raised bubbles on the surface of the casting.
terms of settlement:
a. In the production process, the mold release agent on the surface needs to be blown dry.
b. Strictly control the amount of lubricating oil used for punch and material pipe, and the material head can be slightly yellow.
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