Sharp blade double-level replaceable trepanning drill for fiber enhanced composite hole making

Abstract

The invention discloses a sharp blade double-level replaceable trepanning drill for fiber enhanced composite hole making, belongs to the field of machining tools, and relates to a sharp blade double-level replaceable trepanning drill for fiber enhanced composite hole making, wherein the sharp blade double-level replaceable trepanning drill is suitable for high-quality machining of composite holes with the large hole diameter through the single procedure. A drill bit comprises five parts including a sharp blade cutting mechanism, a sharp blade connecting ring, a broaching cutting area, a diameter changing area and a clamping area. The drill bit is provided with a double-level structure, the first level is a trepanning drill body with a sharp blade structure, and the trepanning drill body is fixed to a tool through a positioning locking block and an L-shaped positioning groove and can be rapidly replaced; and the second level is a twisted type structure in which a piece embedding area is formed through coping, a replaceable transition blade is installed in a transition area of the second level and the first level, and a plurality of replaceable broaching blades are arranged in the direction of a spiral groove. The drill bit can effectively cut out fiber through a sharp blade, the machining damage is reduced through the double-level structure, and the machining quality is improved; and the tool durability is improved through the replaceable mechanism and the replaceable blades, and the sharp blade double-level replaceable trepanning drill is suitable for machining large fiber enhanced composite holes.

Description

technical field [0001] The invention belongs to the field of mechanical processing and manufacturing tools, and relates to a sharp-edged double-stage replaceable casing drill for hole-making of fiber-reinforced composite materials, which is particularly suitable for single-process high-quality processing of composite material holes with large diameters. Background technique [0002] Due to its light weight, high strength, corrosion resistance, fatigue resistance and many other excellent properties, fiber reinforced composite materials have been more and more widely used in the fields of automobile manufacturing and aerospace in recent years. For example, 50% of them are used in Airbus A350WXB Composite materials, and in the connection and assembly of composite components, hole making is an essential link. The number of connection and assembly holes on the single-sided composite wing of the Airbus A350 has reached as many as 55,000. At present, due to the characteristics of w...

AI Technical Summary

Problems solved by technology

Bao Yongjie and others put forward the cutting idea of ​​grinding instead of drilling in "C / E composite material grinding instead of drilling technology" [J]. Aerospace Materials Technology, 2010, (04): 47-49). The above-mentioned utility model and the cutting tools in this paper can effectively reduce the burrs at the entrance and exit during single-hole machining. However, such cutting tools have poor chip removal, and chips are easy to block diamond particles, which affects the quality of hole making. At the same time, the cutting areas are all integrated manufacturing. When the material is worn out, it cannot continue to be used after wear and tear, resulting in high processing costs

He Hu et al. proposed that the brazing method should be used to combine diamond The abrasive grains are consolidated on the metal substrate, so that the manufactured trepanning drill tools have higher wear resistance, and the diamond abrasive grains can still be brazed again after the diamond abrasive grains are worn off, the tool reusability is higher, and the processing cost is reduced. However, due to The brazed diamond cutting area is relatively large, and the single-stage structure drill bit can process large-diameter holes at one time. The axial force is large, and damage such as delamination is easy to occur. Moreover, the abrasive grains are difficult to weld evenly, and vibration is easy to occur during hole making. result in poor hole quality

In addition, the above tools are all single-stage structures, and the damage area generated when processing large-sized holes is large and cannot be removed by subsequent processes, and the quality of the final hole is not high

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