阀体的锻造工艺改进

Improvement of forging process for valve body quality

针对阀体锻造后存在的质量问题如裂纹、端面缩孔、折叠以及参差不齐等缺陷进行分析讨论,认为:在锻造过程中,由于阀体锻件端面温度比较低,截面变化比较大,材料的分配不够合理,导致了金属流动困难是造成质量问题的主要原因。通过对其进行工艺改进——即采用"两个一连"的锻造工艺,之后拔出中间圆棒部分,再用气割的方法将其一分为二。工艺改进后,用料减少了,原来存在的裂纹、缩口、以及接头处参差不齐的质量问题得到了彻底地解决,实验证明本方案是一种切实可行的好方法。

The quality problems, such as crack, shrinkage cavity of end face, puckering etc. , existing in valve body after being forged were analyzed. In forging process, the metal flowing difficulty caused by the temperature of end face of valve body being very low, the cross sections changing greater and the distribution of metal being irrational were the main reasons of quality problems. The process of the valve body was improved. The method of double forging was used, then the circle bar of middle part was forged and the blank was cut into two parts with flame cutting at last. Af- ter improvement, the amount of material was reduced, and the quality problems of crack, shrinkage and puckering of end face were solved. The experiment proves that this method is very feasible for the valve body.