A multi-step and multi-blade gradient micro-tooth cutter for hole making of carbon fiber composite materials

Abstract

The invention provides a multi-step multi-edge gradient micro toothed cutter for drilling carbon fiber reinforced plastics, which belongs to the technical field of composite material machining. The multi-step multi-edge gradient micro toothed cutter is composed of a straight-edge drilling area, a reaming area, a trimming area and a cutter handle, wherein the straight-edge drilling area is provided with a cross edge, main cutting edges, secondary cutting edges and drilling chip grooves, the reaming area is provided with reaming cutting edges and reaming chip grooves, the trimming area is provided with rhombic micro cutting units, right-handed rotating chip grooves and left-handed rotating chip grooves, the rhombic micro cutting units are structurally divided into micro toothed main cutting edges and micro toothed secondary cutting edges, and the sizes of the rhombic micro cutting units are gradually increased in the direction of the right-handed rotating spiral line. The multi-step multi-edge gradient micro toothed cutter is a complete tool and has sufficient strength and rigidity, the drilling axial force is reduced, and additionally, the sizes of the rhombic micro cutting units are gradually increased, so that the deburring efficiency is greatly improved, the trimming quality of a processed hole wall is guaranteed, the transition of the machining process is smooth, and the machining efficiency is improved.

Description

Technical field [0001] The invention relates to a multi-step multi-blade gradual micro-tooth tool used for making holes in carbon fiber composite materials, belonging to the field of composite material machining. Background technique [0002] Carbon fiber composite material (CFRP) is a resin-based composite material with carbon fiber as a reinforcement. It has high specific strength, high specific modulus, corrosion resistance and strong designability. It is widely used in the aerospace field. Because CFRP has the characteristics of heterogeneity, anisotropy, low interlayer strength and high hardness of carbon fiber, during machining, especially during drilling, processing defects such as delamination, tearing and burrs are prone to occur. The existence of defects makes it difficult to guarantee the processing quality and seriously affects the connection strength and fatigue life of CFRP load-bearing structural parts. At this stage, the drilling technology mainly reduces the gen...

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Problems solved by technology

Because CFRP has the characteristics of heterogeneity, anisotropy, low interlayer strength and high carbon fiber hardness, it is prone to processing defects such as delamination, tearing and burrs during machining, especially during drilling, and these processing The existence of defects makes it difficult to guarantee the processing quality, which seriously affects the connection strength and fatigue life of CFRP load-bearing structural parts

At present, the drilling technology mainly reduces the occurrence of delamination and tearing defects by reducing the length of the chisel edge of the tool and increasing the support on the exit side of the carbon fiber composite material, but it cannot effectively deal with the burr defects that have occurred during the drilling process. It is removed by the same drilling process, and it is impossible to trim the hole wall quality while removing the burrs. Therefore, in actual processing, most of the subsequent processing steps are used to remove the burrs, and then the hole wall quality trimming process is performed to ensure reasonable accuracy. Hole wall quality, which greatly reduces hole making efficiency

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