| Aluminum is abundant in nature,and its alloy has small density,easy to heat conduction and good formability,which makes aluminum and its alloy products widely used in the aviation industry.With the dosage and quality requirements,the machining of aluminum alloy has become the focus of research.Because of the small elastic modulus,low resistance to deformation,small cutting impedance,easy to produce cutting vibration and elastic deformation in the process of processing,along with the development of China's industrial level and the increasing demand for aluminium alloys,mechanical processing based on aluminium alloys has become a key research and application field in China.Milling has high production efficiency and is suitable for the processing of complex shape parts,especially for the processing of special surface.Therefore,milling has become one of the main means of processing aluminum alloy structural parts.Aluminum alloy milling mainly embodies in the large amount of heat generated by the cutter and workpiece,which makes the tool wear more intensely and reduces the processing quality;secondly,the different milling parameters(rotational speed)during milling also affect the processing quality;finally,a series of vibration generated by milling system including machine tools and workpieces in the milling process will also affect the milling quality,therefore,the milling quality will be affected.It is of great significance to analyze and study the milling characteristics of aluminium alloy.This paper studied the processing characteristics of milling of I-shaped Aluminum Alloy structure by ball end milling,the cutting force model of ball end milling,through theoretical derivation and experimental verification,the thermal model combined with cutting tool and the workpiece in the milling process,considering the flutter stability of the whole milling system,study the influence factors of the parameters thus,for the future Aluminum Alloy thin parts processing has a guiding role.Specific research contents are as follows:(1)The milling force model of the ball end mill is studied with the milling of I-shaped aluminum alloy structure,and the influence of cutting tool parameters and milling parameters on milling force is discussed by means of simulation and experiment.(2)Through the experimental design,the transient temperature generation and transfer mechanism in the milling process of aluminum alloy was investigated.The influence of different milling parameters on the temperature was studied.(3)Through the research on the stability of Aluminum Alloy I-shaped structure of high speed milling system,combined with hammering method modal experiment,proposed the flutter stability model Aluminum Alloy structure of high speed milling,to obtain three-dimensional stability lobes by simulation software,and carries on the comparative analysis of influence factors,find the milling stability control point,improve the processing quality.(4)Discusses the evaluation index and the causes of the surface quality of Aluminum Alloy milling,and by establishing the theoretical derivation of the surface geometry model of I-shaped structural parts,discuss the orthogonal experiment method for processing by different milling parameters Aluminum Alloy structure surface quality,then the changing rule of the key parameters of milling surface quality with milling process. |
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