A stepped micro-tooth double-edge drill and countersink integrated drill bit

Abstract

The invention discloses a drilling and countersinking integrated drill bit with stepped micro teeth and double edge strips. The drill bit is composed of a main cutting edge area, a stepped micro teeth area, an auxiliary cutting edge area, a countersinking area and a tool handle. A main cutting edge is ground to be of a double-vertex-angle structure. The stepped micro teeth area is provided with a plurality of steps, and each step is provided with n micro teeth structures. The auxiliary cutting edge area comprises two main chip grooves and two auxiliary chip grooves, and the two main chip grooves and the two auxiliary chip grooves form a pair of first auxiliary cutting edges and a pair of second auxiliary cutting edges. The countersinking area is of a four-edge structure formed by four chip grooves. By adoption of the drilling and countersinking integrated tool with the stepped micro teeth and the double edge strips, when a composite and an aluminum alloy laminated material are machined, the multi-step micro teeth can effectively cut off fibers, the axial force of drilling is decreased, delamination damage is reduced, the chip breaking capacity of the tool is improved, and the number of scratches is decreased; and by adoption of the double-edge structure, the machining efficiency can be improved, the chip discharge capacity is enhanced, cutting chip flowing is controlled, high-quality machining is achieved, finally, a countersinking edge can meet the countersinking machining requirements, and drilling and countersinking integrated machining is achieved.

Description

technical field [0001] The invention belongs to the technical field of drilling tools in mechanical processing, and relates to a stepped micro-toothed double-edged tool for realizing integrated high-quality machining of laminated material drilling and countersinking. Background technique [0002] Fiber-reinforced composite materials have excellent properties such as light weight, high strength, fatigue resistance, and corrosion resistance. They have been widely used in many fields such as aviation and automobiles. Carbon Fiber Reinforced Resin-based Polymer (CFRP) materials are used to reduce structural weight and improve fuel economy. However, composite members have poor bearing capacity in interlayer directions and cannot bear multi-directional complex loads. Therefore, only light-weight and high-strength metals can be used in some parts. For the final assembly, composite materials and metal components, especially aluminum alloy components, are usually overlapped to form ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to overcome that when the laminated material composed of CFRP and aluminum alloy is used for integrated drilling and spot finishing, CFRP is easy to be damaged, aluminum alloy is easy to produce burrs, the aperture consistency of the two materials is poor, the smoothness is low, and the tool life is long. In order to solve the low problem, we invented a stepped micro-tooth double-edge drill and countersink integrated drill tool, which is especially suitable for the integrated drilling and countersinking of CFRP and aluminum alloy laminated materials. The tool is a multi-step, multi-cutting edge structure. The integrated drilling and countersinking tool has a micro-tooth structure on the auxiliary cutting edges at all levels, which can effectively realize the integrated drilling and countersinking of high-quality final holes. Both the stepped cutting area and the countersinking cutting edge have margins, which can improve the service life of the drill bit and reduce the The cost

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