膨胀干燥机蜗杆外壳开裂原因分析

CAUSE ANALYSIS OF THE CRACKING ON THE WORM SHELL OF EXPANSION DRYER

从断口宏观检查、硬度测试、常温拉伸试验、蜗杆外壳受力计算以及金相组织观察等方面对发生开裂的膨胀干燥机蜗杆外壳进行分析得出结论,制造厂家将设计材质球墨铸铁误用为灰铸铁,使其力学性能远低于设计要求,是导致蜗杆外壳开裂的主要原因。文章对材质误用的同类问题失效分析和预防有一定参考价值。

This paper makes an analysis on the causes of the cracking on the worm shell of expansion dryer by means of macroscopic inspection of the cracking,hardness test,tensile test at room temperature,screw force calculations and optical microscopy of the cracking.And the results show that manufacturers have misused gray cast iron for ductile iron and made the mechanical properties far below the design requirements. This was the main reason for the worm shell cracking.The paper provides certain referential value for the failure analysis and prevention of the same misuse problems.