钢铸件冒口离开热节动态顺序凝固的研究

STUDY ON DYNAMIC DIRECTIONAL SOLIDIFICATIONOF RISER WHEN BEING AWAY FROM HOTSPOT OF STEEL CASTING

采用现场测温、正交试验现场浇注、计算机凝固数值模拟等方法，研究了铸钢件冒口位置与补缩特性的关系。结果表明：铸钢件冒口离开热节，放在近热节的次热节处，利用冒口根处形成接触热节和冒口补缩液的流通效应，实现动态顺序凝固的工艺原则是可行的。动态顺序凝固与传统几何顺序凝固相比，有利于防止收缩缺陷，提高铸钢件的致密度，提高冒口补缩效率，节约金属。

With the methods of in—situtemperature measure and design of orthogonal test and computer solidification numerical simulation,the feeding character when a riser on hot spot and away from hot spot are studiedThe results show that it is feasible to apply technical principle of dynamic directoinal solidification in steel castingThe dynamic directional solidification means that the riser may be away from hot spot but not far,and that junction—effect of neighbourhood in riser pad and surge flow of feeding metal in riser are made use ofAs compared with traditional geometry directional solidification,the principle of dynamic directional solidification can help to avoid contraction defects,to promote internal quality,and to raise riser efficiency