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1.Utilizing metallic rnaterial characteristic of only changlng form, notchanging volume and flowing to the minimum resistance direction,deliver bar stock heated to900～1050℃to feeding hole of screw-rolls, the centrelines of which are intersecting slant-ingly, and make it go throngh regio of forming and region of sizing,then ball blanks are ob-tained.
利用金属材料受力只改变形状、体积不变及向最小阻力方向流动的特性，将加热到900～1050C的棒料送至中心线倾斜交叉的螺旋轧辊进料口，经成型区、精整区得到钢球毛坯。收藏指正
2.This article is written to explain how to improve the efficiency of riser feeding for cast steel items by modular design method,and the quality of cast steel items is approved when Mw?M 件 and ε(V 冒+V 件)? V r·η ,on shrinkage hole and porosity if this method is used
铸钢件需要冒口进行补缩 ,模数法设计冒口比较科学 ,即MW ≥M件 及ε(V冒 +V件) ≤VWη冒口就有足够的液体补缩铸件 ,实现铸件无缩松、缩孔等疵病 ,保证铸件质量收藏指正
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