| 分析一下产生气孔的主要原因 |
| 添加时间：2018/4/14 16:23:14 浏览次数： |
| 分析一下产生气孔的主要原因 Analyze the main causes of the gas hole 1、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。 1, the permeability of the coating is poor or the negative pressure is insufficient, the permeability of the filling sand is poor, and the gas and residue in the cavity can not be discharged in time, and the gas hole is formed under the filling pressure. 2、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。 2, the pouring speed is too slow to fill the gate cup, expose the sprue, involve in the air and suck the slag quality, and form the stomata and slag holes. 3、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。 3. The foam model gasification decomposition produces a large amount of gas and residue which can not discharge the mold in time. The dry sand filled with foam and coating layer is not dry. Under the high temperature of liquid alloy, a large amount of hydrogen and oxygen invading the castings are the main reasons for the formation of pores. 4、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。 4. Due to the unreasonable design of the pouring system, the filling speed of the metal liquid is greater than the foam gasification and gas discharge and the gas discharge speed, which causes the filling frontier to vaporized the vaporized residue in the metal liquid to form the black black hole of the inner wall. 5、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。 5. The connection between the gate cup and the gating system and the gating system is not well sealed, especially the connection and sealing of the runner and gate cup is not good. It is easy to form sand and air holes under the effect of negative pressure. This phenomenon can be calculated and explained by the Bernoulli equation. |
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