Failure analysis of ring die of a feed pellet machine  

作　　者：He-da Bai Bao-chao Zheng Wei Li Xiao-hui Tu 

机构地区：[1]School of Comprehensive Foundation Studies and Applied Statistics,Zhuhai College of Jilin University,Zhuhai 519041,Guangdong,China [2]Institute of Advanced Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China

出　　处：《China Foundry》2020年第2期167-172,共6页中国铸造（英文版）

基　　金：financially supported by the National Key R&D Program of China(Grant No.:2017YFB0305100);the Teaching Quality and Teaching Reform Project of Guangdong Undergraduate Colleges and Universities:Construction Project of Experiment Demonstration Center(Grant No.:2017002);the Innovation Cultivation Project of Zhuhai College of Jilin University(Grant No.:2018XJCQSQ057)。

摘　　要：The severely worn position and failure mechanisms of the ring die of a feed pellet machine were investigated.The macroscopic and microscopic morphologies of the failed surface,the chemical composition and mechanical properties of the collected samples were analyzed using scanning electron microscopy,energy disperse spectroscopy,optical emission spectrometry,and a universal testing machine.Results show that the dip angle at the entrance of the ring die hole between the roller and ring die was severely worn.The feed powder could not be fully extruded through the dip angle at the entrance of the ring die holes,thus the density of the feed particles produced could not meet the requirements.Therefore,abrasive wear under high stress is the main reason of failure at the entrance of the ring die holes under the action of feeding powder;and cutting and fatigue spalling lead to substantial material loss.In addition,a high damp-heat environment aggravates abrasive wear on the die hole internal surface.

关 键 词：RING DIE failure analysis MICRO-CUTTING WEAR fatigueexfoliative WEAR ELECTROCHEMICAL corrosion 

分 类 号：S817.1[农业科学—畜牧学]