A vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and thereof hybrid stack structure, and has three parts which are a major cutting edge region A, a minor cutting edge region B and a shank region C The minor cutting edge region B comprises a step vertical-edge region D and a sawtooth cutting region E This has the step structure and the sawtooth structure which is distributed in the first step, has a recutting function at the inlet and a reverse cutting function at the outlet in the direction opposite to the main cutting motion The cutter has the vertical edge structure distributed in the second step, and the angle of the second step is a negative value, thereby realizing chip breaking and crushing, reducing scratch to the upper-layer composite material and metal hole walls

Vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and hybrid stack structure thereof

The invention relates to an internal cooling stepped drill capable of inhibiting burrs of a drilling outlet. The internal cooling stepped drill capable of inhibiting burrs of the drilling outlet aimsto solve the problem of more burrs at a drilling outlet in the prior art. The internal cooling stepped drill capable of inhibiting burrs of the drilling outlet comprises a first cutting part, a conical transition part, a second cutting part and a drill body which are sequentially and coaxially connected from left to right; the left end of the first cutting part is a drill tip angle, and the angleof the drill tip angle is smaller than 180 degrees; the included angle between the generatrix of the conical transition part and the central axis of the first cutting part is 40-50 degrees; the outerdiameter of the second cutting part is larger than the outer diameter of the first cutting part, the left end face of the second cutting part is a plane, and the plane is perpendicular to the axis ofthe second cutting part; the outer diameter of the second cutting part is larger than the maximum diameter of the conical transition part; and each of the first cutting part and the second cutting part is provided with a plurality of spiral blades.

Internal cooling stepped drill capable of inhibiting burrs of drilling outlet

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.

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

The invention discloses a handwork drill bit with a return hooking blade, and belongs to the field of machining tools. The related handwork drill bit with the return hooking blade is particularly suitable for handwork hole-making of a fiber reinforced composite material. The drill bit is capable of using double convex vertex angles as a basic drilling type, and modifying angles of the two vertex angles thereof, thereby reducing a drilling axial force, and inhibiting generation of layering and tearing damage. The drill bit is formed by six parts of a cross blade, a first main cutting blade, a second main cutting blade, the return hooking blade, four assistant cutting blades and a cutter handle. The return hooking blade of the drill bit is contained in the second main cutting blade, and formed by a reverse blade and a scraping and cutting blade. The drill bit is capable of using a return hooking blade structure formed by the reverse blade and the scraping and cutting blade, performing secondary removal on generated burr damage, and completing final reaming finishing of a hole wall by using the assistant cutting blades with small rear angles. A chip discharging groove adopts a smallerspiral angle, and interference of unstable feeding to a machining process is reduced. The drill bit is capable of realizing drilling-expanding-reaming one-time handwork high-quality hole-making to the fiber composite material.

Handwork drill bit with return hooking blade

The present invention belongs to the technical field of drilling tools in machining, and relates to a vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and thereof hybrid stack structure The vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and laminated structure thereof comprises three parts which are a major cutting edge region A, a minor cutting edge region B and a shank region C, wherein the minor cutting edge region B comprises a step vertical-edge region D and a sawtooth cutting region E The vertical-edge double-step sawtooth cutter for making high-quality holes of composite material and laminated structure thereof in the present invention has the step structure and the sawtooth structure which is distributed in the first step, has a recutting function at the inlet and a reverse cutting function at the outlet in the direction opposite to the main cutting motion and effectively inhibits damage such as inlet and outlet layering and burr of the composite material The cutter has the vertical edge structure distributed in the second step, and the angle of the second step is a negative value, thereby realizing chip breaking and crushing, reducing scratch to the upper-layer composite material and metal hole walls, removing the metal outlet burr and outlet burr of the composite material from roots and improving outlet quality of the metal and the composite material

Vertical blade double-ladder micro-tooth tool for perforating composite material and laminated structure thereof with high quality

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Vertical blade double-ladder micro-tooth tool for perforating composite material and laminated structure thereof with high quality

Vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and hybrid stack structure thereof