Study On Milling Performance Of Carbon Fiber Reinforced Plastics With Different Structures

Carbon fiber reinforced plastics(CFRP)can not only play the role of functional materials,but also can be used as structural material load.CFRP has both the flexibility and the flexibility of the fiber,which is more and more widely used in the aerospace,military,automotive and other industries.After the formation of the CFRP components generally can not meet the accuracy requirements and taking into account the needs of assembly,the need for its two processing,and milling processing is a very important method of CFRP processing.However,in the process of CFRP high speed milling,it is very easy to produce the surface defects and the rapid wear of the tool due to the anisotropy of the material and poor thermal conductivity.In order to promote the popularization and application of CFRP high speed cutting technology,this paper use the method of experimental research,high speed milling experiments of CFRP unidirectional laminates with TiAIN coating tool,by analyzing the milling process of milling force,tool wear and workpiece surface observation,reveals the influence of fiber structure on the processing properties of CFRP unidirectional laminates.The main research contents are as follows:First of all,through the selection of three different base materials CFRP unidirectional laminates,twelve angles on CFRP unidirectional laminates for high-speed milling experiment,The effects of substrate material and fiber orientation angle on milling force are studied,which can provide experimental basis and theoretical support for material selection and tool wear control in the process of high speed milling CFRP.The results show that the influence of matrix type on cutting force is uniform and stable.Effect of fiber orientation on the cutting force has obvious directivity,the influence of the main cutting force along the direction of milling speed is most obvious,and the influence of the cutting force on the vertical machining surface is less than that of the cutting force along the cutting tool.Secondly,the surface quality of CFRP process in high speed milling is studied,and the surface roughness,the surface edge of the machined surface,the surface micro defects and the surface formation mechanism are analyzed.The CFRP surface roughness evaluation can choose Sq as the surface roughness evaluation parameters,can also be based on the surface with the maximum height of the characterization of Sz surface degree of tearing,further reflect the unique CFRP unidirectional laminate material surface periodic voids.Finally,through the experimental study on the mechanism of tool wear in high speed milling of CFRP,reveal the fibre orientation on the influence of tool wear,elaborate the relationship between cutting force and tool wear,and on the basis of the cutting force and tool wear were studied on the analysis of material CFRP unidirectional laminates in high speed milling process removal mechanism.In the selection of milling methods should be fully considered and weighed the tool wear and surface quality.The experimental results show that the wear mechanism of the tool flank is abrasive wear,adhesive wear and oxidation wear,there is a phenomenon that the tool tip is blunt but not micro chipping.