摘要
以镍基高温合金In625为研究对象,进行短电弧加工特性的试验研究。通过对In625的机械加工性能与电弧加工特性的理论分析,初步确定了相应的短电弧加工机理,并采用正交试验确定出影响加工表面质量的主次因素和最佳电加工参数。同时运用红外热成像仪进行热影响分析,并对电弧加工后的表面层进行检测及分析,确定出金相组织、硬度以及热影响层的变化规律。实验表明:在相同的工艺参数下放电电压减小,则加工表面质量提高;影响工件表面质量的因素主次顺序为电源电压>放电间隙>主轴转速,最佳电加工参数组合为放电间隙0.5 mm、主轴转速60 r/min和电源电压10 V。加工后的材料强度与硬度得到一定提高,金相组织无明显变化,能够得到较好的表面质量,这为短电弧加工镍基高温合金提供了一定的理论依据。
Taking the nickel-based superalloy In625 as the research object,the short electric arc machining characteristics was carried out.Through the theoretical analysis of the machining properties and arc machining characteristics of In625,the corresponding short arc machining mechanism was preliminarily determined,then the primary and secondary factors and optimal electrical processing parameters were determined by the orthogonal test,which can affect the quality of the machined surface.At the same time,infrared thermal imager was used to analyze the thermal effect and the surface layer after arc machining was tested and analyzed.Finally,the change of metallographic structure,hardness and heat-affected layer were determined.Experiments show that when the discharge voltage decreased,the machining surface quality improved with the same process parameters.Primary and secondary factors affecting the surface quality is the power supply voltage>discharge gap>spindle speed and the best electrical machining parameters are 0.5 mm in discharge gap,60 r/min in spindle speed and 10 V in power voltage.The strength and hardness are improved,metallographic structure has no obvious change and it can get a better surface quality,which provides a theoretical basis for nickel-based superalloy in short electric arc machining.
作者
潘旭靓
王天龙
Pan Xuliang;Wang Tianlong(Collegeof Mechanical Engineering,Xi'an Shi-you University,Xi'an 710065,China)
出处
《广东化工》
CAS
2018年第22期1-3,共3页
Guangdong Chemical Industry
关键词
镍基高温合金
短电弧加工
电加工参数
nickel-based superalloy
short electric arc machining
electrical machining parameters
