文档介绍：分类号[] 学校代码 10129
U D C 621 学号 08205002
粉碎机锤片表面强化工艺与自磨刃效果研究
The Research on Surface Hardening Technology and
Self-sharpening Effects of Hammers in Hammer Mills

申请人:张正红
学科门类:工学
学科专业:机械设计及理论
研究方向:机械性能分析与优化
指导教师:申庆泰教授
论文提交日期:二○一一年五月
摘要

锤片是粉碎机中主要的工作部件也是易损件,其磨损钝化不仅影响粉碎机的工作
效率还会降低饲料的加工质量。为了提高锤片的有效工作时间,改善饲料加工质量,
本文采用局部气体渗碳、淬火、低温回火的热处理工艺对锤片进行表面强化处理,得
到了渗层厚度分别为、、的三种自磨刃锤片,再将三种锤片放入
型号为 SFSP60X60 的粉碎机中进行实际生产磨损试验。分析了三种锤片组织变化及
硬度分布规律;磨损过程中重量磨损量、尺寸磨损量变化规律;表面形貌变化规律等。
得出如下结论:
⑴通过对试样组织的观察以及硬度值的测定,分析出了渗层厚度与组织硬度梯
度分布之间的关系,数据显示:锤片渗层越厚,组织硬度梯度越平缓。
⑵在实际生产试验所得数据的基础上,分析了三种渗碳厚度锤片的尺寸磨损量
及体积磨损量在各磨损阶段的变化规律。试验证实,锤片和软物料(饲料)之间的磨
损量与时间的关系与金属间磨损量和时间的关系有一定程度的相似性。
⑶对三种渗碳厚度锤片的宏观磨损形貌进行对比分析后证实, 渗层锤片
磨损量最大,未形成自磨刃效果; 渗层锤片形成了较好的自磨刃形貌,但由于
侧刃硬度偏高,易崩刃,锤片磨损量较大; 渗层锤片自磨刃效果最佳。
⑷从加工时间、生产成本、耐磨性以及自磨刃宏观磨损形貌等方面综合考虑,
渗层锤片在三种自磨刃锤片中自磨刃效果及整体耐磨性最好。

关键词:表面强化;自磨刃;组织;硬度;磨损量
基金项目:内蒙古自然科学基金项目“饲草料加工机械锤片磨损钝化特征及磨损机理研究”(2010MS0806)
The Research on Surface Hardening Technology and
Self-sharpening Effects of Hammers in Hammer Mills

Abstract
The hammer is one of the most important but easy-weared part of the hammer mills,
the passivation wear of hammers can not only affect the efficiency of processing but also
reduce the quality of feed. In order to enhance the effective working time of hammers and
improve the processing quality of feed, obtaining three kinds of self-sharpening hammers
whose carburized layer thickness separately were ,, by using local gas
carburizing, quenching and tempering heat treatment process for the hammers. And then
these self-sharpening hammers were installed in the grinder whose model is SFSP60X60 to
start wear test. Analyzing three kinds of hammers’ microstructure and hardness variation;
the weight wear and size wear variation in the wear process; the surface morphology
variation and so on. The main conclusions are as follows:
(1) Through the microstructure