End mills with end cutting edges for high-speed milling of carbon fiber composites

Abstract

The invention relates to an end mill with an end edge for high-speed milling of carbon fiber composite materials, belonging to the field of cutting and processing of difficult-to-machine materials, and relates to a special tool for high-speed milling of carbon fiber composite materials for blind grooves, blind windows and special-shaped blind holes. The end mill is designed with a cutting edge at the end of the milling cutter, and has a chip groove on the end face; Arc edge composition. There are two parallel end face chip flutes with a certain depth on the end edge part; end edge chip flutes are opened between the edges of the end edge. The variable chip flute helix angle peripheral edge part is an asymmetrical helical staggered structure, and m right-handed helical flutes and n left-handed chip flutes are staggered to form several micro-tooths of equal size. The end mill adopts variable helix angle chip splitter to reduce the flutter effect of the tool during milling, improve the chip holding performance during milling, and reduce the thermal damage of composite materials, so as to realize high-speed, stable and effective processing of carbon fiber composite materials.

Description

technical field [0001] The invention belongs to the field of cutting processing of difficult-to-machine materials, and relates to a special cutting tool for high-speed milling blind grooves, blind windows and special-shaped blind holes of carbon fiber composite materials. Background technique [0002] Carbon fiber composite material (CFRP) has the characteristics of high specific strength, high specific stiffness, fatigue resistance and corrosion resistance, etc. strength and all-composite structures. With the widespread use of carbon fiber composites in the main load-bearing components of aerospace, based on the requirements of high service reliability in large-scale and complex stress-bearing environments, the quality requirements for machining are also more stringent. Carbon fiber composite material is a typical difficult-to-machine material. It is a mixed form of fiber and resin in the microscopic view, and anisotropic and laminated in the macroscopic view, resulting in...

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Problems solved by technology

In order to increase the cutting depth of micro-tooth cutting and improve processing efficiency, Wang Fuji of Dalian University of Technology and others invented the "multi-blade micro-tooth milling cutter for high-speed milling of carbon fiber composite materials", and applied for patent number 201610806761.5. The milling cutter includes Zhou The blade part, the drill tip part and the tool shank part increase the length of the micro-tooth, and the drill tip structure can effectively process windows and through holes, but these two milling cutters cannot be used for milling blind windows, milling blind slots and machining special-shaped Blind hole, so the milling cutter has certain limitations in practical application

Secondly, the milling speed of carbon fiber composite materials is relatively high, generally between 3000r / min and 10000r / min, and the number of cutting edges increases. Chips and heat dissipation, exacerbating the problem of composite thermal damage

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