TiN刀具涂层抗多次冲击性能研究

doi:10.16731/j.cnki.1671-3133.2018.07.018

现代制造工程 ›› 2018, Vol. 454 ›› Issue (7): 105-111.doi: 10.16731/j.cnki.1671-3133.2018.07.018

TiN刀具涂层抗多次冲击性能研究

刘灿宇^1,2, 刘战强^1,2

1 山东大学机械工程学院,济南 250061;
2 山东大学高效洁净机械制造教育部重点实验室,济南 250061

收稿日期:2017-04-28 出版日期:2018-07-20 发布日期:2018-07-20
通讯作者: 刘战强,通信作者,教授,博士研究生导师,主要研究方向为切削加工理论与刀具技术。E-mail:sduliucanyu@gmail.com
作者简介:刘灿宇,硕士研究生,主要研究方向为涂层刀具后处理及评价技术。
基金资助:
国家科技重大专项项目(2015ZX04005008);国家杰出青年科学基金项目(51425503)

Characterization for repeated impact resistance of TiN tool coatings

Liu Canyu^1,2, Liu Zhanqiang^1,2

1 School of Mechanical Engineering,Shandong University,Jinan 250061,China;
2 Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education, Shandong University,Jinan 250061,China

Received:2017-04-28 Online:2018-07-20 Published:2018-07-20

摘要/Abstract

摘要： 刀具涂层在机械加工领域中的重要性日益凸显,涂层力学性能的表征方法随之将更加受到重视。显微硬度法、划痕法和静态压入法等评价方法可模拟涂层在静态力下的失效行为,但难以评价刀具涂层在动态切削力下的物理力学性能,如刀具涂层的抗冲击性能。利用自行研制的压电陶瓷驱动冲击试验机,对化学气相沉积TiN刀具涂层进行多次冲击试验,研究刀具涂层的抗多次冲击性能和失效机理,分析TiN刀具涂层抑制裂纹萌生和裂纹扩展的能力。研究结果表明,压电陶瓷驱动冲击试验机在相同试验条件下失效行为的重现性好,多次冲击试验可有效评价刀具涂层的抗多次冲击性能。随冲击次数增加,刀具涂层失效机理由内聚力失效向结合力失效转变。涂层裂纹萌生可用涂层开始氧化磨损时的冲击次数评判,涂层失效比例可作为涂层抑制裂纹扩展能力的评价标准。研究结果有助于刀具涂层抗多次冲击性能的评价和刀具涂层冲击失效机理的揭示,为刀具涂层后处理喷砂强化、涂层材料优选等提供理论支撑。

关键词: TiN刀具涂层, 抗冲击性能, 压电陶瓷

Abstract: The tool coatings have been widely applied in machining field and their evaluation methods are being gain more attention.Existing evaluation methods for tool coating characterization such as the microhardness,scratch and indentation test can simulate the failure behaviors under static loads.However,these methods are hard to characterize the tool coating performances such as impact resistance under dynamic forces caused by impact loads.In this paper,TiN tool coatings were repeatedly impacted using a specially designed impact tester driven by piezoelectric actuator.Experimentation and analysis concerning failure mechanism and repeated impact resistance were presented.Coating fracture initiation and propagation mechanism for TiN tool coatings under repeatedly impact test were studied.Experimental results indicate that the failure mechanism transform from cohesive failure to adhesive failure with the increase of impact cycles.The fracture initiation of TiN tool coatings can be characterized by oxidation wear and the fracture propagation rate can be evaluated by failed area ratio.The results of this research provide the characterization of tool coating performance and detailed explanation for failure mechanism with repeated impact loadings,which can be applied to the optimization of the tool coating materials and the strengthening coating performance evaluation with micro-blasted post treatment.

Key words: TiN tool coatings, impact resistance, piezoelectric actuator

中图分类号:

TG711
O484.4

刘灿宇, 刘战强. TiN刀具涂层抗多次冲击性能研究[J]. 现代制造工程, 2018, 454(7): 105-111.

Liu Canyu, Liu Zhanqiang. Characterization for repeated impact resistance of TiN tool coatings[J]. Modern Manufacturing Engineering, 2018, 454(7): 105-111.

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TiN刀具涂层抗多次冲击性能研究

Characterization for repeated impact resistance of TiN tool coatings

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