覆砂铁型工艺试制轻量化球墨铸铁飞轮壳铸件

介绍了轻量化薄壁球墨铸铁飞轮壳铸件的结构及技术要求,详细阐述了该铸件的覆砂铁型生产工艺,对试制过程中出现的裂纹和冷隔缺陷进行了分析,通过对工艺适当优化,成功生产出无裂纹、冷隔和其他铸造缺陷的高强度薄壁复杂球墨铸铁飞轮壳件,并实现了批量生产。最后指出:(1)覆砂铁型工艺生产薄壁件必须加强排气,增加浇注系统面积实现快速浇注;(2)覆砂铁型工艺生产薄壁件需要加大覆砂层厚度,减少铁型厚度以减少铸件收缩阻力,防止铸件产生裂纹。

The Lawson Partial Order on Wrpp Semigroups

In this paper,we introduce Lawson partial order ≤ w on wrpp semigroups.After obtaining some properties of ≤ w,we determine when ≤ w is(left;right) compatible with the multiplication.These results extend and enrich the related results of Lawson and GuoLuo on abundant semigroups,of Guo-Shum on rpp semigroups and of Liu-Guo on wrpp semigroups.

Right pp Semigroups with Multiplicative Right Adequate Transversals

In this paper,the concept of right adequate transversals of rpp semigroups is introduced.We establish the structure of rpp semigroups with multiplicative right adequate transversals in terms of right normal bands and right adequate semigroups.In particular, some special cases are considered.

Factorisable Quasi-adequate Semigroups

In this paper,we investigate a class of factorisable IC quasi-adequate semigroups,so-called,factorisable IC quasi-adequate semigroups of type-（H,I）.Some characterizations of factorisable IC quasi-adequate semigroups of type-（H,I） are obtained.In particular,we prove that any IC quasi-adequate semigroup has a factorisable IC quasi-adequate subsemigroups of type-（H,I） and a band of cancellative monoids.

气缸体水泵壳气缩孔的解决方案

介绍了一种带齿轮室和冷却水泵壳的四缸柴油气缸体铸件的结构,详细阐述了该铸件的生产工艺,对水泵壳高点周围3个位置出现的孔类缺陷进行了大量分析,初期从气孔角度分析和采取措施,均不能彻底消除该孔类缺陷。后期从气缩孔角度考虑,通过结构分析和数值模拟相结合的方法,将浇注系统各组元截面积增加14.8%~15.1%,浇注速度提高到12~14 s,顶面氧化物由2.1%下降为1.8%,彻底解决了最高点气缩孔问题,其废品率由最初的60%以上降至0,取得了很好的效果。