Efficient carbon fiber reinforced plastic hole making cutter and dip angle hole making method

Abstract

The invention discloses an efficient carbon fiber reinforced plastic hole making cutter and a dip angle hole making method, and belongs to the field of carbon fiber reinforced plastic machining. The cutter comprises a cutter bar, a milling supplementary cutting edge, a combined cutting part and a bottom cutting part which are connected in sequence. The dip angle hole making method mainly comprisesthe steps that parameters are calculated; the cutter is parallel to the axis of hole diameter and rotates downwards to carry out feeding in the axial direction, and layer-by-layer shunting machiningis carried out, so that the hole diameter error can finally keep at IT7 - IT8; if the hole diameter error does not meet IT8 - IT9, the dip angle between cutter and the axis of the hole diameter is adjusted, hole pre-milling is carried out, the hole is completed through zero empty trip milling supplementary, the axis of the cutter is adjusted to be parallel to the axis of the hole diameter and eccentric distance, and the allowance of the hole diameter is removed; and if the hole diameter error does not meet the IT7 - IT8, the dip angle between the cutter and the axis of the hole diameter is maintained, the hole pre-milling and the hole completing through milling supplementary are carried out, the cutter returns to an initial null point after the hole making is completed, and quality detection is carried out. According to the efficient carbon fiber reinforced plastic hole making cutter and the dip angle hole making method, the machining defects such as burrs, layering of the carbon fiberreinforced plastic can be avoided.

Description

technical field [0001] The invention relates to the field of mechanical processing of carbon fiber composite materials, in particular to a carbon fiber composite material high-efficiency hole-making tool and a dip-angle hole-making method. Background technique [0002] With the development of aerospace technology, lightweight and high-quality equipment has attracted great attention from all over the world. Carbon fiber composite material (CFRP) is a resin-based composite material with carbon fiber as a reinforcement. It has light weight, high specific strength, and specific modulus. High performance, corrosion resistance and strong designability, etc., are widely used in the aerospace field. Boeing series airliners use more than 50% CFRP materials. Only 3 fuselage sections of the A380 have more than 10,000 connection holes. Each pair of wings More than 8,000 connection holes are required, but due to the characteristics of heterogeneity, anisotropy, low interlayer strength an...

AI Technical Summary

Problems solved by technology

[0002] With the development of aerospace technology, lightweight and high-quality equipment has attracted great attention from all over the world. Carbon fiber composite material (CFRP) is a resin-based composite material with carbon fiber as a reinforcement. It has light weight, high specific strength, and specific modulus. High performance, corrosion resistance and strong designability, etc., are widely used in the aerospace field. Boeing series airliners use more than 50% CFRP materials. Only 3 fuselage sections of the A380 have more than 10,000 connection holes. Each pair of wings More than 8,000 connection holes are required, but due to the characteristics of heterogeneity, anisotropy, low interlayer strength and high hardness of carbon fiber, CFRP is prone to processing defects such as delamination, tearing and burrs, making it difficult to guarantee the processing quality, seriously It affects the CFRP load, the fatigue life of the connected structural parts and the connection strength

The traditional drilling technology mainly reduces the generation of delamination and tearing defects by reducing the length of the chisel edge of the tool, increasing the design of the rake angle and the support of the carbon fiber composite material exit side, but the generated burr defects cannot be effectively passed through the same time. Removal or trimming during the drilling process restricts the processing efficiency and makes it difficult to guarantee the quality of the aperture

The helical milling process reduces the hole-making burr by reducing the axial force, which will easily lead to increased local wear of the tool and reduce the tool life. It is also impossible to complete the burr removal or trimming in one-time processing, which restricts production efficiency and product quality.

Images