【作者】 吴勇；

【导师】 王彤；

【作者基本信息】 哈尔滨理工大学 ， 机械工程（专业学位）， 2018， 硕士

【摘要】 大厚度工件的多介质电火花线切割多次切割实验研究是近年来电火花加工最主要研究方向。随着科技的不断发展,人们对于高科技产品和大型设备质量要求越来越高,然而现在的普通金属切削加工很难达到要求,所以我们寻求新的解决方法。通过对大厚度工件多介质电火花线切割多次切割精加工实验研究,得到大厚度工件电火花多次切割的最优加工参数和最合适的介质顺序,很大的提高了电火花的加工质量和切削效率,满足大厚度工件的精加工要求。使电火花线切割机床应用的越来越广泛,对电火花线切割加工技术的发展具有重大意义和巨大的经济效益。首先,通过对大厚度工件的电火花线切割实验研究和多次切割实验原理得出了大厚度工件的多次切割的介质顺序。通过大厚度工件的单因素实验,得出大厚度电火花加工最合适的工作液电导率、二次切割修正量、机床跨距、电极丝直线和张紧力。通过单因素试验法来得出单个因素对大厚度工件表面质量(表面粗糙度和直线度)和加工效率的影响。利用多因素正交试验建立大厚度工件在蒸汽水雾介质下的第二次电火花线切割的直线度模型、表面粗糙度模型和加工速度模型。通过序关系法计算得出直线度,粗糙度和加工速度的权重分别是5/17、6/17和6/17,采用去量纲法进行加权处理,得到大厚度工件在蒸汽水雾介质下的第二次电火花线切割的综合评价模型。检验得出大厚度工件在蒸汽水雾介质下的第二次电火花线切割单个模型和综合模型都非常显著,拟合度比较好。其次,利用响应面分析法(CCD)建立大厚度工件在超声水雾介质下的第三次电火花线切割的直线度模型、表面粗糙度模型和加工速度模型。通过序关系法计算得出直线度,粗糙度和加工速度的权重分别是6/18、7/18和5/18,采用去量纲法进行加权处理,得到大厚度工件在超声水雾介质下第三次切割的综合评价模型,检验得到大厚度工件在超声水雾介质下的第三次电火花线切割单个建模型和综合模型都非常显著,拟合度比较好。最后,利用响应面分析法BBD建立大厚度工件在大气介质下的第四次电火花线切割的综合模型,并通过序关系和去量纲化处理得出大厚度工件在大气介质下的第四次切割的综合评价模型,检验单个建模型和综合模型都非常显著,拟合度比较好。通过以上四次切削综合模型,大厚度工件的电火花线切割加工表面质量和加工速度均有较大的提高。更多还原

【Abstract】 Large thickness workpiece and multi-dielectric EDM cutting is a new technology developed in recent years 。the demand for product quality is getting higher and higher.The precision requirements of large equipment also become higher and higher,but now the common metal cutting difficult to meet the requirements,so we seek new solutions.Through the experiments of multi-material WEDM with large thickness,the optimμm machining parameters and suitable media sequence for multi-cutting EDM are obtained,which improves the machining quality of EDM and satisfies the requirement of large thickness Finishing requirements to meet the requirements for finishing of large thick parts.Reciprocating wire electric WEDM more widely used.It Go to the dimensional treatmentis of great significance and economic benefits to promote WEDM technology.First of all,through the experimental study and the principle of large-thickness WEDM,the mediμm order of multiple cutting of large-thickness workpiece is obtained.Through the single-factor experiment of large thickness workpiece,the most suitable working fluid conductivity,secondary cutting correction,Second cut the amount of Cutting,Electrode wire tension,Machine tool span and wire straight line.By single factor test method to analyze the various factors on Surface Quality and processing speed.The multi-factor orthogonal experiment was used to establish the straightness model,surface roughness model and processing speed model of the second WEDM under the condition of steam mist mediμm.By order relationship analysis method to determine the straightness,surface roughness and processing speed of the weight is 5 / 17,6 / 17 and 6/17,To the Dimensionalization treatmentand then weighting process.Obtained a large thickness of the workpiece in the steam mist mediμm second WEDM comprehensive evaluation model.Test a single model and comprehensive model are very significant,Fitting degree is better.Secondly,the linearity model,the surface roughness model and the processing speed model of the third WEDM under the ultrasonic water mist mediμm were established by using the response surface analysis method CCD.By order relationship analysis method to determine the straightness,surface roughness and processing speed of the weight is 6 / 18,7 / 18 and 5/18,To the Dimensionalization treatmentand then weighting process.Obtained a large thickness of the workpiece in the steam mist mediμm third WEDM comprehensive evaluation model.Test a single model and comprehensive model are very significant,Fitting degree is better.final,the linearity model,the surface roughness model and the processing speed model of the fourth WEDM under the ultrasonic water mist mediμm were established by using the response surface analysis method BBD.By order relationship analysis method to determine the straightness,surface roughness and processing speed of the weight To the Dimensionalization treatmentand then weighting process.Obtained a large thickness of the workpiece in the steam mist mediμm fourth WEDM comprehensive evaluation model.Test a single model and comprehensive model are very significant,Fitting degree is better.Through the four cutting,large-thickness EDM surface quality and processing speed have greatly improved.更多还原