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铝合金压铸件孔隙率和杂质的处理方法

来源:http://www.jnhjgs.cn     发布时间:2021-08-07 11:41:37    点击:

铝合金压铸件气孔产生的原因:
Causes of air holes in aluminum alloy die castings:
a、在冲孔和凝固过程中,从涂层蒸发的气体侵入熔融金属,造成铸件表面或内部的圆孔。
a. During punching and solidification, the gas evaporated from the coating invades the molten metal, resulting in round holes on the surface or inside of the casting.
b、合金液中的气体含量过高,在凝固过程中也会形成圆孔。
b. If the gas content in the alloy liquid is too high, round holes will also be formed during solidification.
收缩孔隙率的原因:
Reasons for shrinkage porosity:
a、在液态合金凝固过程中,由于体积减小或更终凝固部分不能被液态金属填充,产生收缩腔。
a. In the solidification process of liquid alloy, the shrinkage cavity is generated due to the reduction of volume or the final solidification part can not be filled by liquid metal.
b、在加热过程中,由于厚度不均匀或局部过热,铸件凝固慢慢地在某个地方,和铸件表面成凹时体积收缩。
b. During heating, due to uneven thickness or local overheating, the casting solidifies slowly in a certain place and shrinks when it is concave with the casting surface.
由于存在气孔和缩孔,压铸件的表面处理非常麻烦,这些气孔可能进入水中,当电镀后进行喷涂和烘烤时,气孔中的气体会加热膨胀,或者气孔中的水会变成蒸气、体积膨胀、体积膨胀。在铸件表面发泡时,应在生产中使用适当的方法。解决这些弊端的原因。
Due to the existence of pores and shrinkage pores, the surface treatment of die castings is very troublesome. These pores may enter the water. When spraying and baking after electroplating, the gas in the pores will heat and expand, or the water in the pores will become steam, volume expansion and volume expansion. When foaming on the surface of castings, appropriate methods shall be used in production. The reasons for solving these disadvantages.
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如何解决铝合金压铸件的气孔和杂质问题?
How to solve the problems of porosity and impurities in aluminum alloy die castings?
铝合金压铸
Aluminum alloy die casting
1.孔铝合金压铸:
1. Hole aluminum alloy die casting:
解决这一问题的关键是减少掺入铸件的气体量。在理想状态下,合金的金属流动状态应从喷嘴通过分锥和浇道进入型腔,形成光滑均匀的金属流动方向。在模拟充型系统压铸过程的研究中,可以清楚地看到,浇道位置的急剧变化和截面积的增大将引起金属液流动的湍流和夹带。只有当光滑的液态金属有利于气体从流道和型腔进入溢流槽和排气槽时,才能将其排出beplay全站app安卓。使用新型陶瓷过滤材料不使用两次喷嘴材料,也减少了杂质。
The key to solve this problem is to reduce the amount of gas added into the casting. In the ideal state, the metal flow state of the alloy should enter the cavity from the nozzle through the sub cone and sprue to form a smooth and uniform metal flow direction. In the study of simulating the die casting process of mold filling system, it can be clearly seen that the rapid change of sprue position and the increase of cross-sectional area will cause the turbulence and entrainment of liquid metal flow. Only when the smooth liquid metal is conducive to the gas entering the overflow groove and exhaust groove from the runner and cavity can it be discharged from the mold. The use of new ceramic filter materials, without the use of twice nozzle materials, also reduces impurities.
2.关于缩孔:
2. About shrinkage:
通过合理的喷嘴设计、内浇口厚度及位置、beplay全站app安卓设计、beplay全站app安卓温度控制及冷却,使各部位在凝固过程中尽可能均匀散热,同时凝固,避免收缩。注意废物中的杂质元素。控制合金原料中有害杂质的含量,特别是铅含量<0.002%。
Through reasonable nozzle design, inner gate thickness and position, mold design, mold temperature control and cooling, all parts can dissipate heat as evenly as possible during solidification, solidify at the same time and avoid shrinkage. Pay attention to impurity elements in waste. Control the content of harmful impurities in alloy raw materials, especially the content of lead < 0.002%.
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