top contraction

It is concluded through analysis that the combustion chamber contraction cavity of the thick-top piston is mainly caused by the defect of the mould and the inefficiency of the water-cooling system.

经过分析得出结论：造成厚大项部活塞毛坯燃烧室缩孔问题的主要原因是由于模具本身的弊端和水冷系统效果不佳。

The reason resulting in contraction cavity in top of 195T piston combustion chamber in practice was analyzed, and the countermeasures of eliminating the contraction cavity were taken.

研究了在生产195T活塞毛坯时所遇到的燃烧室顶部缩孔问题，对其产生原因进行了分析，并提出了消除缩孔所采取的措施。

Taking 195T piston mould as an example, this paper studies the problem of contraction cavity encountered during the production of thick-top pistons.

以195t活塞模具为例，研究了在生产厚大顶部活塞毛坯时所遇到的缩孔问题。

In the plane layout of double dikes, the sudden expansion or contraction should be avoided. The elevation of the top of the dike should be identical with middle tide level.

双导堤平面布置不宜呈突然扩大或收缩状，堤顶高程宜与中潮位一致。