Carbon fiber reinforced composite special drill bit with straight cutting edge type blade
A technology of reinforcing composite materials and carbon fibers, which is used in tool holder accessories, drill repairs, drilling tool accessories, etc., can solve the problems of burr generation, easy delamination, etc., to reduce cutting force, improve wear resistance, and improve hole making. quality effect
Pending Publication Date: 2018-02-23
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
[0003] In order to solve the above-mentioned technical problems, the present invention provides a special drill bit for carbon fiber reinforced composite materials with a straight edge blade to solve the problems of easy delamination and generation of burrs during the drilling process of carbon fiber reinforced composite materials, thereby improving the manufacturing efficiency of carbon fiber reinforced composite materials. Hole processing quality and processing efficiency
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[0020] The present invention will be further described below in conjunction with accompanying drawing.
[0021] like Figure 1~2 As shown, the present invention includes a drill body 1, and two spiral grooves 2 with a small inclination are processed axially on the outer peripheral surface of the drill body 1, and the spiral grooves 2 are all left-handed, and the spiral groove 2 is aligned with the axis helix angle δ , the helix angle δ 0-15°, the chips can be discharged smoothly, and the cutting efficiency and chip removal ability can be improved.
[0022] The two helical grooves 2 are respectively connected to the blade 11 at the head of the drill body, and the material of the blade 11 is polycrystalline diamond, which is welded on the head of the drill body 1 . It is also possible that the blade 11 and the drill body 1 are of an integral structure, made of cemented carbide. The insert 11 includes two cutting edges. The insert 11 is divided into drill tip part I, reamin...
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Abstract
The invention discloses a carbon fiber reinforced composite special drill bit with a straight cutting edge type blade. The special drill bit comprises a drill bit main body, wherein two spiral groovesare processed in the outer circumferential surface of the drill bit main body in the axial direction, the turning directions of the two spiral grooves are the same, and the two spiral grooves are separately connected with a blade at the head part of the drill bit main body; the blade comprises two cutting edges, the blade is divided into a drill tip part, a reaming part, a multi-edge tip part anda dip angle reaming part from the front part to the rear part, and the cutting edges of the drill tip part, the reaming part, the multi-edge tip part and the dip angle reaming part are lines which are not coincided with each other and are sequentially connected; and the two cutting edges at the drill tip part are connected through a cross edge. The phenomena of burrs, layering and the like can beeffectively prevented from occurring in the drilling process of the carbon fiber reinforced composite special drill bit, drilling flaws are reduced, the processing efficiency is increased, the processing quality is improved, and the cutter service life is prolonged, so that the qualified rate of products is increased.
Description
technical field [0001] The invention belongs to the technical field of drilling tools, in particular to a special drill bit for carbon fiber reinforced composite materials with a straight-edged blade. Background technique [0002] Carbon fiber reinforced composites (CFRP) have excellent properties such as high specific strength and large specific modulus, and have broad application prospects in the field of aerospace high-tech. At present, the body materials of large aircraft in Europe and America are transitioning from aluminum alloy to composite materials, and 50wt% composite materials will be the starting point for future aircraft. When assembling and connecting, a large number of hole processing is required. For example, a Boeing 747 fighter jet has nearly 3 million connecting holes. However, because CFRP has the characteristics of anisotropy and poor interlayer connection strength, it is easy to produce processing defects such as delamination and burrs on the hole exit...
Claims
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IPC IPC(8): B23B51/08
CPCB23B2251/505B23B51/08B23B2226/31B23B2251/18B23B2251/14B23B2222/28B23B2251/408
Inventor 苏飞李时春邓朝晖孙富建陈冰
Owner HUNAN UNIV OF SCI & TECH