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不锈钢铸件产生气孔的主要原因
[作者:aowl] [日期:19-02-22] [浏览次数:] [来源:]

不锈钢铸件产生气孔的主要原因 :
The main causes of Blowhole in stainless steel castings are as follows:
01
01
涂料的透气性差或者负压不足,充填砂的透气性差,不能及时排出型腔内的气体及残留物,在充型压力下形成气孔。
The poor permeability or negative pressure of the coating and the poor permeability of the filling sand can not discharge the gas and residues in the cavity in time and form a pore under the filling pressure.
02
02
浇注速度太慢,未能充满浇口杯,暴露直浇道,卷入空气,吸入渣质,形成携裹气孔和渣孔。
The pouring speed is too slow to fill the gate cup, expose the straight runner, get into the air, inhale the slag, and form the entrapment pore and slag hole.
03
03
泡沫模型气化分解生成大量的气体及残留物不能及时排出铸型,泡沫•●、涂料层填充干砂的干燥不良,在液态合金的高温包围下,裂解出大量的氢气和氧气侵入铸件是形成气孔的主要原因。
The foam model is decomposed to generate a large amount of gas and the residue can not be discharged in time. The dry sand with foam and coating layer is desiccant. Under the high temperature of liquid alloy, a large amount of hydrogen and oxygen are poured into the casting, which is the main reason for the ion of pores.
04
04
由于浇注系统设计不合理,金属液的充型速度大于泡沫气化退让及气体排出速度,造成充型前沿将气化残留物包夹在金属液体中再次气化形成内壁烟黑色的分解气孔。
Due to the unreasonable design of the gating system, the filling speed of the metal liquid is greater than that of the foam gasification and the gas discharge rate. The filling front will cause the gasification residue to be encapsulated in the metal liquid again to form a decomposed hole in the inner wall.
05
05
浇口杯与直浇道以及浇注系统之间的连接处密封不好,尤其是直浇道与浇口杯的连接密封不好,在负压的作用下很容易形成夹砂及气孔,这种现象可以用伯努利方程计算和解释。
The sealing of the connection between the gate cup and the runner and the gating system is not good, especially the connection between the gate and the gate cup is not good. Sand entrainment and blowhole are easily formed under negative pressure. This phenomenon can be calculated and explained by Bernoulli equation.
06
06
型砂的粒度太细,粉尘含量高,透气性差,负压管道内部堵塞造成负压度失真,使型腔周围的负压值远远低于指示负压,气化物不能及时排出涂层而形成气孔或皱皮。
The grain size of moulding sand is too fine, the dust content is high, the permeability is poor, and the internal blockage of negative pressure pipeline results in the distortion of negative pressure, which makes the negative pressure around the cavity far lower than the indicated negative pressure, and the gases can not discharge the coating in time to form stomata or wrinkles.

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