die lines

Based on in situ measurements, similar material simulation experiments and theoretical analysis,this paper emphatically analyzes the rock failure of the floor in coal seams caused by changing the dimension of the mould.

通过现场实测、实验室相似材料模拟实验和理论分析，着重分析了压模尺寸变化引起的底板岩体破坏，获得了底板岩体极限比压与压模尺寸的关系式［ｑ］＝ａΦｂ及有关结论。

Improvement of Die Structure of Passenger Door for Buses;

客车乘客门压模结构的改进

A technological method to repair the die of vessel head successfully is introduced, and the failing experience is concluded for reference.

介绍一种成功修复封头压模的工艺方法,并总结了失败经验,以供参考。