CN104999118A - High-efficiency special drilling head for drilling holes in carbon fiber composite material - Google Patents

High-efficiency special drilling head for drilling holes in carbon fiber composite material Download PDF

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Publication number
CN104999118A
CN104999118A CN201510408743.7A CN201510408743A CN104999118A CN 104999118 A CN104999118 A CN 104999118A CN 201510408743 A CN201510408743 A CN 201510408743A CN 104999118 A CN104999118 A CN 104999118A
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Prior art keywords
micro
cutting edge
tooth
cutting
drilling
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CN201510408743.7A
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CN104999118B (en
Inventor
王福吉
何春伶
贾振元
付饶
钱宝伟
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Dalian University of Technology
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Dalian University of Technology
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/08Drills combined with tool parts or tools for performing additional working
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2226/00Materials of tools or workpieces not comprising a metal
    • B23B2226/27Composites
    • B23B2226/275Carbon fibre reinforced carbon composites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/04Angles, e.g. cutting angles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/40Flutes, i.e. chip conveying grooves
    • B23B2251/408Spiral grooves

Abstract

The invention belongs to the technical field of drilling and cutting tools in mechanical processing, and relates to a high-efficiency special drilling head for drilling holes in a carbon fiber composite material. A cutter is the multiple-cutting-edge cutter with double vertex angles and a micro tooth structure and particularly suitable for the one-time high-quality high-efficiency processing of the high-performance carbon fiber reinforced composite material. The drilling head consists of a main cutting region, an assistant cutting region and a cutter handle, wherein a micro tooth cutting region is arranged at a connecting position of the main cutting region and the assistant cutting region; the main cutting region consists of a first main cutting edge and a second main cutting edge; in the assistant cutting region, a left-hand thread is formed in an assistant cutting edge; the micro tooth cutting region consists of a plurality of micro teeth. According to the high-efficiency special drilling head disclosed by the invention, the double vertex angles and the micro tooth structure are utilized, so that a function of integrated processing of drilling-expanding-reaming is realized, the axial force of the drilling and the cutting is reduced, layered defects are overcome, the holes with high size accuracy are obtained, the service life of the drilling head is prolonged, the situation that the cutter is frequently replaced is avoided, and the processing efficiency is improved.

Description

A kind of efficient target drill for carbon fibre composite drilling
Technical field
The invention belongs to drilling tool technical field in machining, relate to a kind of efficient target drill for carbon fibre composite drilling, this cutter is the multiple-cutting-edge tool with Double Tops angle and micro-toothing, is particularly suitable for the disposable high-quality of high-performance carbon fibre reinforced composite, high efficiency processing.
Background technology
Carbon fibre composite has the excellent combination property such as high specific strength, high specific stiffness, antifatigue, corrosion-resistant and excellent designability, is widely used in aerospace structure design.Boring is one of machining that in carbon fibre composite part manufacture process, workload is the heaviest, and such as a frame Boeing-747 aircraft has more than 300 ten thousand connecting holes.But due to the interlaminar strength of material low, very easily produce layering during boring in exit, the defect such as to tear, and matrix phase thermal conductivity is bad, carbon fiber hardness is high, makes tool wear fast, adopts common fluted drill to be difficult to process the hole without layering, impulse-free robustness defect.Research both at home and abroad for carbon fibre composite tool for cutting machining shows, cutter material high speed steel is not suitable for the processing of carbon fibre composite, polycrystal diamond cutter can improve the life-span of drilling cutters, but it is expensive, and can only be used for the process of steady drilling.Carbide alloy has good intensity and toughness, can meet the process requirements of carbon fibre composite, but the common fluted drill of carbide alloy is still difficult to the drilling demand meeting high-quality and high-efficiency.
The geometry of cutter be affect composite drilling quality and cutter life reuse factor, devise the drill bit of various geometry both at home and abroad for carbon fibre composite, these drill bits have respective pluses and minuses.One " there is the new drill of conical transition zone " is disclosed as Xi'an airplane industry Co., Ltd, number of patent application 200320125153.6, compared with common fluted drill, the conical transition zone of blade is added between the drilling rod and head of drill bit, the principle that drill bit is holed on thin wall parts and process change a lot, eliminate hole exits edge delamination, plucking that normal drill bit boring often produces to a certain extent, but this drill bit apex point place rigidity is lower, easy generation vibration, the roughness of causing hole and precision are difficult to ensure.The and for example patent " low chisel edge drill bit " of Suzhou Ahno Cutting Tool Technology Co., Ltd., number of patent application 201310104178.6, the head of this drill bit has two chip areas, itself and knife back intersection in the axial direction forms two main cutting edges respectively, main feature be three top, middle is top lower than both sides, such design can take into account tool strength and centering ability, two outer top fibers effectively can scraping disconnected hole periphery, less burr, but when processing the composite of intensity between high strength fiber peacekeeping low layer, the damage that easy generation is torn, and the point of a knife cutting speed on both sides is the fastest, be easy to wearing and tearing, once tool wear, drilling quality starts obvious decline.Sandvik Intellectual Property discloses one " fluted drill for advanced material ", number of patent application 201180020931.2, relate to the fluted drill of the boring for such as carbon fibre reinforced composite and glass fibre reinforced composion, propose to be provided with initial spiral angle and the terminal spiral angle that variable helical has restriction, to be combined with main relief angle and secondary relief angle, fluted drill is made to be suitable for thrust is minimized, especially when for holing to fibrous composite, and especially when for Manual drilling.This invention is also proposed to adopt large secondary chisel edge angle to be conducive to the processing of composite.This kind of drill bit is compared fluted drill and can be reduced lamination defect to a certain extent, but veining defect can occur very soon along with the wearing and tearing of cutter, and the service life of drill bit is shorter.
Summary of the invention
The technical barrier that the present invention will solve overcomes the problem that carbon fibre composite easily produces layering and veining defect in drilling, and invention is a kind of for carbon fibre composite, especially tackles the drilling cutter of high-performance carbon fibre composite.This cutter is a kind of Double Tops corner structure drill bit with the micro-sword of dentation, by the Double Tops corner structure of main cutting edge, micro-toothing of main cutting edge and front cutting edge connecting portion, achieve the function of brill-expansion-hinge integration processing, obtain the hole of high dimensional accuracy, can realize disposable without layering, impulse-free robustness drilling, and the service life of drill bit can be improved, reduce use cost.
The technical solution used in the present invention is a kind of efficient target drill for carbon fibre composite drilling, it is characterized in that, drill bit is by main cutting district A, and secondary cutting region B and handle of a knife C forms, in main cutting district A and B junction, secondary cutting region by the micro-tooth cutting region D be made up of several micro-tooth X;
Described main cutting district A has two parts cutting edge, is respectively the first main cutting edge 1 and the second main cutting edge 2; Wherein, the first apex angle α be made up of two the first main cutting edges 1 is 90 °-120 °, and the second apex angle ss be made up of four the second main cutting edges 2 is 10 °-30 °; Article two, the radial Breadth Maximum e of the first main cutting edge 1 is less than the half of bit diameter R; Because the first apex angle α is different with the angle of the second apex angle ss, form the Double Tops corner structure of main cutting district A; Second main cutting edge 2 is formed by same helicla flute with front cutting edge 3;
In described secondary cutting region, front cutting edge 3 is left hand thread, and helical angle ω is 5 °-10 °, and front cutting edge anterior angle γ is 10 °-30 °; The tool diameter of front cutting edge 3 position is bit diameter R;
In the described micro-tooth cutting region D be made up of several micro-tooth X, on the second main cutting edge 2, micro-tooth X quantity 1-3 is individual, and on front cutting edge 3, micro-tooth X quantity 2-4 is individual; Micro-tooth X quantity on micro-tooth X number ratio second main cutting edge 2 on front cutting edge 3 wants many;
The angle theta scope of each micro-tooth X top tooth tangent line and front cutting edge 2 is 75 °-90 °; The included angle scope of each micro-tooth X lower teeth tangent line and front cutting edge 2 is 100 °-130 °; Micro-tooth height b is 0.3-0.8mm, and micro-tooth depth d is micro-tooth height 1.5 times-2 times; Micro-tooth X on every bar cutting edge is micro-tooth height 2-4 times along the array distance c of tool axis.
Effect of the present invention and benefit are that efficient target drill passes through to adopt Double Tops angle and micro-toothing, and achieve the function of brill-expansion-hinge integration processing, obtain the hole of high dimensional accuracy, decrease operation, reduction drilling axial force, reduces lamination defect.The non-cut staple that cutting exit bends recoils in the micro-toothing on blade, is cut off, reduce burr by follow-up cutting edge.Micro-toothing of array arrangement, can repeatedly cutting burr repeatedly, improves the service life of drill bit.Avoid frequent tool changing, reduce use cost, improve working (machining) efficiency.
Accompanying drawing explanation
Fig. 1 is the front view of efficient target drill; The left side view of the efficient target drill of Fig. 2; Micro-toothing figure of the efficient target drill of Fig. 3; Wherein: 1-first main cutting edge, 2-second main cutting edge, 3-front cutting edge, α-the first drift angle, β-the second drift angle, γ-front cutting edge anterior angle, ω-helical angle, a-chisel edge, the micro-tooth height of b-, c-array distance, the micro-tooth depth of d-, the angle of θ-micro-tooth top tooth tangent line and front cutting edge 2, the angle of φ-micro-tooth lower teeth tangent line and front cutting edge 2, the radial Breadth Maximum of e-two the first main cutting edges, A-main cutting district, the secondary cutting region of B-, C-handle of a knife, the micro-tooth cutting region of D-, the micro-tooth of X-, R-bit diameter.
Fig. 4 is the hole wall surface roughness value comparison diagram of drill bit of the present invention and commercially available drilling tool, and wherein, 1-drilling tool #1,2-drilling tool #2, abscissa represents the hole count of processing, and ordinate represents processing hole wall roughness Ra, unit mm.
Detailed description of the invention
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing and technical scheme.
Efficient target drill is as shown in Figure 1, Figure 2, Figure 3 shows divided into main cutting district A, secondary cutting region B and handle of a knife C tri-part, at micro-tooth cutting region D that main cutting district A and B junction, secondary cutting region are made up of several micro-tooth X in addition.Drill bit can be divided into 5 stages in drilling process, and the first stage is extruding, and be that chisel edge a contacts and extrudes workpiece, due to the extrusion effect of chisel edge, axial thrust increases rapidly; Second stage is extruding and drilling, and now the first main cutting edge 1 enters material, starts to remove material, and thrust is to increase more by a small margin; Phase III is drilling, and now chisel edge arrives bottom workpiece, and bore from after workpiece at chisel edge, axial force reduces suddenly.Fourth stage is drilling and ream, and now thickness of slab material is all processed by the second main cutting edge 2, and axial thrust fluctuation is little.Five-stage is deburring and fraising, and now the second main cutting edge 2 starts to leave workpiece, and micro-toothing starts to remove burr, and front cutting edge 3 reams, and axial force reduces further.
Front cutting edge 3 adopts left hand thread and less helical angle, adopts less helical angle to be conducive to chip discharge, and can realize fraising effect, reduces Hole Wall Roughness; In drilling process, shank end is overlooked, and drill bit turns clockwise, and realize cutting in cutter direction to the right, the design of left revolving blade increases the real work anterior angle of cutting edge to the right, and larger anterior angle is conducive to the cutting of carbon fibre reinforced composite.
In the present embodiment, getting bit diameter R is 8mm, and the first main cutting edge 1 maximum radial width e is 1/3, helical angle ω of bit diameter R is 5 °, and the front cutting edge anterior angle γ of front cutting edge 3 is 10 °.Main cutting district has two sections of cutting edges to be made up of the first main cutting edge 1 and the second main cutting edge 2, and the first apex angle α of two the first main cutting edge 1 formations is different with the angle of the second apex angle ss that four the second main cutting edges 2 are formed, and forms Double Tops corner structure.The angle of getting the first apex angle α is 90 °, and the second apex angle ss is 10 °.
Shown in the left side view of target drill as efficient in Fig. 2, by grinding first main cutting edge, form chisel edge a, chisel edge length will control, than short during general drilling metal material, less chisel edge is more conducive to reducing layering, but the too small reduction easily causing cutter life of chisel edge.In the present embodiment, chisel edge a is of a size of 0.22mm.Micro-tooth X quantity 1 on second main cutting edge 2, micro-tooth X quantity 4 on front cutting edge 3; Micro-tooth cutting region D has 5 teeth, as shown in Figure 3.Get micro-tooth height b=0.8mm, micro-tooth depth d=1.2mm, array distance c=1.6mm.
Experiment porch adopts three axle high-precision numerical control machines.Drill bit material is carbide alloy, without coating.Dry-type processing, without cooling.Machine spindle speed is 3000r/min, and axial feed is 150mm/min.Test piece is that unidirectional pre-immersion material is according to [(-45/0/45/90) 2/ 0 2] sthe T800 level epoxy resin base carbon fiber composite material that the 4mm of direction laying is thick, this material is widely used in aircraft industry, its intensity is high, but inter-layer bonding force is weak, very easily layering is produced in processing, belong to typical difficult-to-machine material, there is well representative and challenge, also embody practicality of the present invention.
Drill bit of the present invention is called drilling tool #1, and commercially available drilling tool is called drilling tool #2.Adopt identical technological parameter and installation way to carry out drilling, after drilling terminates, use super depth-of-field microscope to measure the hole quality of actinal surface, use coarse measurement instrument to measure the roughness of hole wall.Performance and the commercially available commercially available drilling tool comparative result for carbon fibre composite of drill bit of the present invention are shown in accompanying drawing 4, being described as follows of test result:
(1) exit hole quality
Drilling tool #2 burr when processing first hole is very little, and has small layering, and along with the increase of hole count, burr becomes greatly very soon, and layering also starts aggravation.Drilling tool #1 does not have layering and burr when processing the 1st hole, and quality is fine, and during processing the 5th hole, quality still very well.
(2) Hole Wall Roughness
Front 5 hole roughness metric, the roughness value Ra of drilling tool #1 is on average 0.8, and the mean value of drilling tool #2 is about 2.0.Therefore, the drilling roughness quality of drilling tool #1 of the present invention is better.
(3) cutter life
Drilling tool #2 burr when processing the 2nd hole has started to increase, and more serious during the 4th hole, the life-span of this drill bit is shorter.And drilling tool #1 quality behind processing 5 holes still very well, proceeds drilling experiment, final discovery drilling tool #1 at least can process 20 holes, without layering, impulse-free robustness, has good cutter life.

Claims (2)

1. the efficient target drill for carbon fibre composite drilling, it is characterized in that, drill bit is by main cutting district (A), secondary cutting region (B) and handle of a knife (C) composition, have with secondary cutting region (B) junction the micro-tooth cutting region (D) be made up of several micro-teeth (X) at main cutting district (A);
There is two parts cutting edge in described main cutting district (A), is respectively the first main cutting edge 1 and the second main cutting edge 2; Wherein, the first drift angle (α) be made up of two the first main cutting edges (1) is 90 °-120 °, and the second drift angle (β) be made up of four the second main cutting edges (2) is 10 °-30 °; Article two, the radial Breadth Maximum (e) of the first main cutting edge (1) is less than the half of bit diameter R; Because the first drift angle (α) is different with the angle of the second drift angle (β), form the Double Tops corner structure in main cutting district (A);
In described secondary cutting region, front cutting edge (3) is left hand thread, and helical angle (ω) is 5 °-10 °, and front cutting edge anterior angle (γ) is 10 °-30 °; The tool diameter of front cutting edge (3) position is bit diameter R, and the second main cutting edge (2) and front cutting edge (3) are formed by same helicla flute;
In the described micro-tooth cutting region (D) be made up of several micro-teeth (X), on the second main cutting edge, the quantity of micro-tooth (X) is 1-3, and on front cutting edge, the quantity of micro-tooth (X) is 2-4.
2. according to a kind of efficient target drill for carbon fibre composite drilling according to claim 1, it is characterized in that, top tooth tangent line and front cutting edge angle (θ) scope of each micro-tooth (X) on drill bit are 75 °-90 °; Each micro-tooth lower teeth tangent line and front cutting edge angle (φ) scope are 100 °-130 °; Micro-tooth height (b) is between 0.3-0.8mm, and micro-tooth depth (d) is 1.5 times-2 times of micro-tooth height; Micro-tooth (X) on every bar cutting edge along array distance (c) of the tool axis 2-4 that is micro-tooth height doubly.
CN201510408743.7A 2015-07-13 2015-07-13 High-efficiency special drilling head for drilling holes in carbon fiber composite material Active CN104999118B (en)

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CN105499665A (en) * 2016-01-08 2016-04-20 大连理工大学 Multi-step multi-edge tool for integrally perforating superposed-structural part
CN105598509A (en) * 2016-03-07 2016-05-25 大连理工大学 Drill bit special for high-quality drilling of carbon fiber reinforced composite
CN106077768A (en) * 2016-06-14 2016-11-09 大连理工大学 A kind of multi-ladder the most micro-cutting drill head of carbon fibre reinforced composite drilling
CN106270664A (en) * 2016-08-30 2017-01-04 大连理工大学 A kind of polycrystalline diamond compact bit with the micro-toothing of flip Trim
CN106270700A (en) * 2016-09-06 2017-01-04 大连理工大学 Multiple-cutting-edge micro-tooth milling cutter for carbon fibre composite high speed milling
WO2017028801A1 (en) * 2015-08-18 2017-02-23 大连理工大学 Micro-tooth structure having reverse cutting function and series drilling tools
CN106624080A (en) * 2016-12-20 2017-05-10 大连理工大学 Drilling and countersinking integrated drill bit with stepped micro teeth and double edge strips
CN106799510A (en) * 2015-11-26 2017-06-06 中国直升机设计研究所 A kind of advanced composite material (ACM) drilling cutter
CN107520487A (en) * 2016-06-20 2017-12-29 江苏天工工具有限公司 Ream one dagger is bored to bore
CN108608040A (en) * 2018-05-10 2018-10-02 大连理工大学 For composite material and its micro- serrated knife tool of the double ladders of the perpendicular sword of laminated construction high quality drilling
CN109551015A (en) * 2019-01-15 2019-04-02 深圳市航天精密刀具有限公司 A kind of efficient hard combined drill for machining composite material
WO2019213888A1 (en) * 2018-05-10 2019-11-14 大连理工大学 Vertical blade double-ladder micro-tooth tool for perforating composite material and laminated structure thereof with high quality

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WO2017028801A1 (en) * 2015-08-18 2017-02-23 大连理工大学 Micro-tooth structure having reverse cutting function and series drilling tools
US10857601B2 (en) 2015-08-18 2020-12-08 Dalian University Of Technology Sawtooth structure with reversed cutting function and its drill series
CN106799510B (en) * 2015-11-26 2019-02-26 中国直升机设计研究所 A kind of advanced composite material (ACM) drilling cutter
CN106799510A (en) * 2015-11-26 2017-06-06 中国直升机设计研究所 A kind of advanced composite material (ACM) drilling cutter
CN105499665A (en) * 2016-01-08 2016-04-20 大连理工大学 Multi-step multi-edge tool for integrally perforating superposed-structural part
CN105598509A (en) * 2016-03-07 2016-05-25 大连理工大学 Drill bit special for high-quality drilling of carbon fiber reinforced composite
CN106077768B (en) * 2016-06-14 2018-07-13 大连理工大学 A kind of mostly micro- cutting drill head of the multi-ladder of carbon fibre reinforced composite drilling
CN106077768A (en) * 2016-06-14 2016-11-09 大连理工大学 A kind of multi-ladder the most micro-cutting drill head of carbon fibre reinforced composite drilling
CN107520487A (en) * 2016-06-20 2017-12-29 江苏天工工具有限公司 Ream one dagger is bored to bore
CN106270664A (en) * 2016-08-30 2017-01-04 大连理工大学 A kind of polycrystalline diamond compact bit with the micro-toothing of flip Trim
CN106270700A (en) * 2016-09-06 2017-01-04 大连理工大学 Multiple-cutting-edge micro-tooth milling cutter for carbon fibre composite high speed milling
CN106624080B (en) * 2016-12-20 2018-10-16 大连理工大学 A kind of micro- tooth Double-margin brill ream one drill bit of ladder
CN106624080A (en) * 2016-12-20 2017-05-10 大连理工大学 Drilling and countersinking integrated drill bit with stepped micro teeth and double edge strips
WO2019213888A1 (en) * 2018-05-10 2019-11-14 大连理工大学 Vertical blade double-ladder micro-tooth tool for perforating composite material and laminated structure thereof with high quality
CN108608040B (en) * 2018-05-10 2020-04-07 大连理工大学 Vertical-edge double-step micro-tooth cutter for high-quality hole making of composite material and laminated structure of composite material
US10751810B2 (en) 2018-05-10 2020-08-25 Dalian University Of Technology Vertical-edge double-step sawtooth cutter for preparing high-quality holes of composite material and hybrid stack structure thereof
CN108608040A (en) * 2018-05-10 2018-10-02 大连理工大学 For composite material and its micro- serrated knife tool of the double ladders of the perpendicular sword of laminated construction high quality drilling
CN109551015A (en) * 2019-01-15 2019-04-02 深圳市航天精密刀具有限公司 A kind of efficient hard combined drill for machining composite material

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