展宽角对楔横轧一次成形气门毛坯心部缺陷的影响

以DEFORM-3D 6.0软件为有限元模拟工具,模拟了楔横轧一次成形气门毛坯过程,对不同展宽角下轧件中心点的应力应变场及交变次数进行了研究.在楔横轧H500轧机上进行不同展宽角轧制实验,计算了每个轧件中心孔洞面积,并对其比较分析.结合有限元模拟和实验结果,揭示了展宽角对心部缺陷的影响规律,即相对较大的展宽角有利于改善心部缺陷.实验结果表明:中心孔洞面积随展宽角的增大而减小;在其他参数不变的情况下展宽角取8°40'有利于改善楔横轧一次成形气门毛坯心部缺陷.

Effect of stretching angle on internal defects in valve roughcasts produced by single cross wedge rolling

The forming process of valve roughcasts by single cross wedge rolling was simulated with finite element software DEFORM-3D 6.0,focusing on the stress and strain fields and alternating times of rolled pieces at the center point under different stretching angles.Rolling experiments at different stretching angles were done on an H500 rolling mill,and the area of the centre hole was calculated for each rolled piece.The influence of stretching angle on internal defects in rolled pieces was analyzed on the basis of simulation and experimental results.It is shown that a relatively larger stretching angle can improve the internal defects.Experimental results show that the area of the centre hole decreases with the stretching angle increasing.The stretching angle of 8°40' is propitious to improve internal defects in valve roughcasts produced single cross wedge rolling when the other parameters are invariable.