Machining method for drill bit with blade inclined groove structures for machining composite material

Abstract

The invention discloses a machining method for a drill bit with blade inclined groove structures for machining a composite material, belongs to the technical field of drilling tools in machining, andrelates to the machining method for the drill bit with the blade inclined groove structures for machining the composite material. According to the machining method, a downward component force is generated by a front tool face of the drill bit to an inlet material, turning-up of the inlet material is restrained, and the end face blade inclination angle at the outer edge turning point of a tool tiparea of the drill bit is made to be a positive value. In the tool tip area of the drill bit, the front tool face and a rear tool face are partially ground firstly. Then, a grinding wheel is used for grinding the front tool face at the outer edge turning point to obtain the two blade inclined groove structures. After grinding, a new front tool face and a new blade are obtained, and the end face blade inclination angle formed by the new blade and a base face is a positive angle. According to the drill bit with the blade inclined groove structures machined through the method, the current situation that the end face blade inclination angles of traditional drill bits are all negative angles is changed, stripping and layering of fiber materials at the inlet position can be effectively restrained, inlet tearing and burr damage are effectively prevented, and low-damage machining of a hole inlet during composite material drilling is achieved.

Description

technical field [0001] The invention belongs to the technical field of drilling tools in mechanical processing, and relates to a drilling method for processing composite materials with an inclined groove structure. Background technique [0002] Fiber-reinforced composites (FRP) have been widely used in the aerospace field due to their high specific strength and corrosion resistance. In order to realize connection and assembly, it is inevitable to carry out hole-making processing on composite material components, such as positioning pin holes and counterweight holes of composite tail rotor blades of helicopters. However, due to the weak restraint of the surface fibers of composite materials, damage such as burrs and tears occurs frequently when metal drills are used to make holes, especially when drilling entry materials, the surface fibers are easily bent upwards under the action of the main cutting edge , causing the entrance to peel and delaminate, resulting in cracking a...

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