摘要
通过对电火花线切割碳钢工件的亚表面层组织金相观测和微观硬度测量,分析不同碳含量碳钢工件亚表面层的微观组织结构,获得不同碳含量碳钢工件亚表面层的微观硬度分布情况,结合材料相变理论,阐明工件微观组织和微观硬度分布的形成机理。随后,设计单因素实验,分析工艺参数和碳含量的增加对于重铸层厚度(RLT)的影响规律,并分析这些影响规律的内在原因。实验结果显示重铸层厚度随碳含量的增加先增大后减小,重铸层厚度随脉冲电流和脉冲宽度增大而增大,随间隙电压增大而减小。该研究可为实际电火花线切割加工过程提供重要的理论依据。
Carbon steel is the most widely used metal material in practical industry,and traditional processing method can manufacture some special structure,such as narrow slit and small deep hole.Wire electrical discharge machining(WEDM)is an effective method for machining above structure because of its manufacture principle.In WEDM,the micro surface quality of workpiece has direct relationship with its reliability,stability and service life,and analyzing the affecting factors of workpiece micro surface quality is of great importance to improve its using performance.In this paper,through metallographic observations and microhardness testing,the microstructures and the microhardness distribution of different carbon content workpiece subsurface material are obtained.Then,the forming mechanism of workpiece microstructures and microhardness is revealed by combining the theory of material phase change.Additionally,single factor experiment is implemented to acquire the influence trend of processing parameters and carbon content on the recast layer thickness.Experiment data indicate that recast layer thickness increases firstly and then decreases with the increasing of carbon content,and it has positive correlation with discharge current and pulse width,and it shows a negative correlation with gap reference voltage.This study can provide some theory reference for the actual WEDM process.
作者
陈志
李红丽
CHEN Zhi;LI Hongli(State key Laboratory of High Performance and Complex Manufacturing,College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,CHN;College of Electromechanical and Vehicle Engineering,Zhengzhou Institute of Technology,Zhengzhou 450044,CHN)
出处
《制造技术与机床》
北大核心
2018年第10期143-145,160,共4页
Manufacturing Technology & Machine Tool
基金
国家自然科学基金资助(51805552)
中南大学高性能复杂制造国家重点实验室自主课题(ZZYJKT2018-10)
