CN105598509A - Drill bit special for high-quality drilling of carbon fiber reinforced composite - Google Patents
Drill bit special for high-quality drilling of carbon fiber reinforced composite Download PDFInfo
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- CN105598509A CN105598509A CN201610125675.8A CN201610125675A CN105598509A CN 105598509 A CN105598509 A CN 105598509A CN 201610125675 A CN201610125675 A CN 201610125675A CN 105598509 A CN105598509 A CN 105598509A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/08—Drills combined with tool parts or tools for performing additional working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/20—Number of cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
- B23B2251/408—Spiral grooves
Abstract
The invention relates to a drill bit special for high-quality drilling of carbon fiber reinforced composite and belongs to the technical field of drilling tools. The drill bit is a double-edge small-vertex-angle rightward-rotation drill bit with a micro-tooth structure. Each main cutting edge of the drill bit is provided with two rear tool faces, two main cutting edges form a small-vertex-angle structure and a short transverse edge, and the front-angle coping of the main cutting edges is consistent. An auxiliary cutting edge is provided with the micro-tooth structure, and the diameter of the middle portion of the auxiliary cutting edge is variable. The drill bit has the advantages that drilling axial force and layering are reduced due to the fact that the drill bit has the small-vertex-angle structure and the short transverse edge; by the micro-tooth structure of the auxiliary cutting edge, burrs generated during drilling can spring back into the micro-tooth structure and be cut off by micro-teeth, outlet and inlet burrs can be removed effectively, and the tear damage when the final hole is formed is reduced; the drill bit is good in machining quality, high in precision and long in service life.
Description
Technical field
The invention belongs to drilling tool technical field in machining, relate to a kind of carbon fibre reinforced compositeThe target drill of high-quality drilling.
Background technology
Carbon fibre reinforced composite (CFRP), with its good mechanical property, has been widely used in advanced person and has flownThe manufacture of machine part, as advanced Boeing 787 and Air Passenger A350XWB, its composite consumption up toMore than 50%, significantly alleviate aircaft configuration weight, improved the fuel economy of aircraft. But, composite woodAlthough material can be realized entirety and manufacture larger part, inevitably need to connect between part and partConnect, just can be assembled into parts, and above-mentioned aircraft is all generally by riveting with the connection between composite material partsThe mode that connects, is spirally connected is carried out mechanical connection, thereby must carry out drilling processing to composite material parts. Due toCFRP is mainly the mixed style being made up of mutually carbon fiber wild phase and resin matrix, presents obviously in macroscopic viewAnisotropy and stacked feature, its interfacial bonding strength is far below other directions. When boring due to entrance andA little less than the effect of contraction of exit position, apex point very easily produces larger axial force, backs down several layer materials of outermost, producesRaw delamination damage, and because causing fiber bending by cut staple, cause and tear and burr equivalent damage. Meanwhile,Because carbon fiber wild phase is extremely hard, easily aggravate tool wear, cause cutting edge not sharp, be difficult to cut staple,Very easily cause serious outlet and entrance burr. It is special large for the general aperture of the connection between large-scale part,Thickness is large, and in its drilling process, cutting temperature is high, and axial force is large, and layering equivalent damage more easily occurs, and becomesFor one of technical bottleneck in the manufacture of aviation composite equipment.
Research both at home and abroad shows that the geometry of cutter is the key factor that affects CFRP drilling quality, for gramTake the problems referred to above, realize the high-quality processing in the large aperture of CFRP, large thickness hole, researcher both at home and abroadThe drilling cutter of having developed multiple different structure geometric format, these cutters have pluses and minuses separately. Zhou Anshan," new minor-edge multipoint aerial drill " number of patent application 200910132775.3 of Liu Dechun invention, it relates to a kind of newMinor-edge multipoint aerial drill, for titanium alloy, high-strength carbon fiber reinforced composite, has proposed one and has changedThe fluted drill entering, is provided with center and both sides totally three apex points, and micro-ladder and groove structure, fried dough twist relativelyBore, and in the time of aperture drilling, can improve drilling quality and cutter life, but for large slab, its apex pointLong chisel edge and large drift angle, can produce very large axial force, cause the fiber of drilling outlet to prolong machine direction largeWidth cracking, in the case, when two cutting edges of outer end cut, can further back down and hold againThe fiber splitting, causes damage serious; Meanwhile, cutting edge outermost end cutting linear velocity maximum, easily causes outermostThe outstanding cutting blade tip of end weares and teares rapidly, and cutter life is low, aggravation damage. Jia Zhen unit of Dalian University of TechnologyUnderstand " a kind of efficient target drill for carbon fibre composite drilling ", number of patent application etc. human hair201510408743.7, it relates to the knot of the Double Tops angle with the micro-sword of dentation for the drilling of carbon fibre compositeStructure drill bit, by the Double Tops corner structure of main cutting edge, micro-tooth knot of main cutting edge and front cutting edge connecting portionStructure, has realized brill-expand-the cut with scissors function of integrated processing, obtains the hole of high dimensional accuracy. But, this cutterCutting edge is longer, and while processing thicker composite panel, smear metal is difficult to discharge, and causes temperature in working anglesHigher, easily cause the damage of tearing of fire damage and outlet.
Summary of the invention
The technical barrier that the present invention will solve is to overcome large thickness fibre reinforced composites oversized hole onceProperty the drilling middle outlet problem that easily produces layering, burr, tear equivalent damage, invent a kind of carbon fiber and strengthen multipleThe target drill of condensation material high-quality drilling. This target drill is a kind of little drift angle of twolip with micro-toothingDextrorotation drill bit, knife face after the each main cutting edge of apex point has two, two main cutting edges form little drift angle structure andCompared with hyphen sword, the anterior angle reconditioning of main cutting edge is consistent, and front cutting edge has micro-toothing, the centre of front cutting edgePosition reducing, can realize disposable high-quality, the high efficiency of large thickness fibre reinforced composites oversized holeProcessing.
The technical solution used in the present invention is the special jewel of a kind of carbon fibre reinforced composite high-quality drillingHead, this target drill have the main cutting district (A) that formed by main cutting edge (1) envelope, clamp area (C),By main cutting edge (1) end and clamp area (C) initial position be the secondary cutting region (B) that forms of envelope,Reducing district (D) and micro-tooth cutting region (E), is characterized in that, this target drill is a kind of micro-toothing that hasThe little drift angle dextrorotation of twolip drill bit, knife face after the each main cutting edge of apex point has two, two main cutting edges form littleDrift angle structure and compared with hyphen sword, the anterior angle reconditioning of main cutting edge is consistent, and front cutting edge has micro-toothing, and pair is cutCut the middle part reducing of sword; Concrete structure and the parameter of target drill are as follows:
Knife face (8) and (9) after every cutting edge in main cutting district (A) has two, tool diameter is D1，Drift angle (α) between 85 °-90 °, chisel edge length between 0.1-0.6mm, the anterior angle (γ) of main cutting edge (1)After reconditioning, be definite value, anterior angle (γ) between 15 °-20 °, the first relief angle (α of main cutting edge (1)1)Between 10 °-12 °, the second relief angle (α of main cutting edge (1)2) between 15 °-25 °, the first relief angle (α1)With the second relief angle (α2) ratio between 0.4-0.5, and the second rear knife face (9) area is major first flank(8) 4-6 of area doubly; Reducing district (D) is arranged in secondary cutting region (B), the diameter of reducing district (D)For D2, its value is at (0.98-0.99) D1Between, reducing district (D) starts between the position and apex point of reducingAxial distance (b) be greater than micro-tooth topmost and strengthen and answer with the carbon fiber of processing to the distance (a) of apex pointCondensation material thickness of slab and, the axial length of reducing district (D) is between 3-4mm; The helical angle of chip area existsBetween 30 °-34 °;
Micro-tooth cutting region (E) is positioned on the front cutting edge (2) of secondary cutting region (B), micro-tooth cutting region (E)Formed by several micro-teeth (4); Micro-tooth (4) is identical at the upper contour structure of same front cutting edge (2),Its projected outline is oval or circular; Micro-tooth (4) is distributed with 3-5 along every front cutting edge (2),The upper distributed quantity of every front cutting edge (2) is identical, and axial location is identical; From the nearest micro-tooth (4) of apex pointAnd main cutting district (A) finish positional distance between 1-1.5mm, micro-tooth axis (6) and tool axis(5) angle between (β) is 90 ° to 100 °, micro-tooth around drill axis be helix distribute, on micro-tooth tooth limit withThe angle (δ) of tool axis (5) between 85 ° to 100 °, micro-tooth lower tooth limit and tool axis (5)Angle (ε) between 110 ° to 125 °.
Effect of the present invention and benefit are that target drill has little drift angle structure and hyphen sword, reduce drilling axialPower, reduces layering; After reconditioning, there is the main cutting edge of identical anterior angle, be more conducive to cut staple, furtherReduce layering equivalent damage; Micro-toothing on front cutting edge, has realized the burr producing in drilling processCan resilience toothing being cut off by micro-tooth in a subtle way, can effectively remove entry and exit burr, reduced and formed eventually, tear damage when in the hole; The helicla flute of dextrorotation is conducive to cutting and the chip removal of exit material, has reduced and has cutCut temperature; After two of main cutting edge, the relief angle of knife face differs larger, has reduced between target drill and workpieceFriction, has reduced cutting temperature, has improved workpiece crudy; Adopt variable-diameter structure, reduced drillingIn the final shaping unit stage, the vibration of hole entrance side, has improved aperture precision and entrance quality.
Brief description of the drawings
Fig. 1 is the front view of the target drill of a kind of carbon fibre reinforced composite high-quality drilling; Fig. 2 a)For the partial enlarged view of micro-tooth cutting region E in front view, Fig. 2 is b) micro-tooth cutting region E in left viewPartial enlarged view; Fig. 3 is the partial enlarged view of apex point in front view; Fig. 4 is that the A-A of Fig. 3 analyses and observeFigure; Fig. 5 is the upward view of dedicated tool. Wherein, A-main cutting district, the secondary cutting region of B-, C-clamp area,D-reducing district, the micro-tooth of E-cutting region, 1-main cutting edge, 2-front cutting edge, 3-front cutting edge end, the micro-tooth of 4-,The axial line of 5-target drill, the micro-tooth axial line of 6-, 7-chisel edge, 8-main cutting edge 1 major first flank, 9-masterCutting edge 1 second rear knife face, α-drift angle, β-micro-tooth spiral is to angle, γ-drill bit anterior angle, on δ-micro-tooth tooth limit with speciallyWith the angle of drill axis, ε-micro-tooth lower tooth limit and target drill axis angle, α1-drill bit the first relief angle, α2-Drill bit the second relief angle, the axial distance between the a-micro-tooth in the top and apex point, initial position and the brill of b-reducing district DAxial distance between point, the micro-space width of c-, the micro-facewidth of d-, D1The diameter of axle of-secondary cutting region B, D2-reducing district DThe diameter of axle.
Fig. 6 is the ingate that adopts target drill processing, and Fig. 7 is the outlet opening that adopts target drill processing.
Detailed description of the invention
Describe specific embodiment of the invention in detail below in conjunction with accompanying drawing and technical scheme.
As shown in Figure 1, Figure 2, Fig. 3, Fig. 4, a kind of carbon fibre reinforced composite high-quality system shown in Fig. 5The target drill in hole can divide for the main cutting district A that formed by main cutting edge 1 envelope, by main cutting edge 1 endEnd and clamp area C initial position are secondary cutting region B, clamp area C, the reducing district D and micro-that envelope formsFive regions of tooth cutting region E. Drill bit can be divided into 8 stages in drilling process, and the first stage is extruding,Be that chisel edge 7 contacts and push workpiece, due to the extrusion effect of chisel edge 7, axial thrust increases rapidly; SecondStage is extruding and drilling, and now main cutting edge 1 enters material, starts to remove material, and thrust is with more small sizeDegree increases; Phase III is extruding, drilling and deburring, and micro-toothing starts to remove burr; Fourth stageFor drilling and deburring, now chisel edge 7 arrives workpiece bottom, bores after workpiece axial force at chisel edge 7Reduce suddenly; Five-stage is deburring and ream, and now main cutting edge 1 bores from workpiece, front cutting edge 2Ream, axial force further reduces; The 6th stage was fraising, and now micro-sword structure is left workpiece, pairCutting edge 2 is proceeded fraising; The 7th stage was fraising and reducing district D participation processing, and reducing district D startsEnter workpiece, better, bit cutting temperature is lower in heat radiation; The 8th stage was fraising, and reducing district D bores from workPart, front cutting edge 2 reams.
Two main cutting edges 1 form little drift angle structure, adopt less drift angle, are conducive to reduce drilling axial force,Reduce lamination defect; On front cutting edge 2, be designed with micro-toothing, realized the hair producing in drilling processThorn can resilience toothing being cut off by micro-tooth in a subtle way, can effectively remove entry and exit burr, reduced formation, tear damage when in whole the hole; Front cutting edge 2 adopts dextrorotation structure, is conducive to remove burr; Each main cuttingKnife face after sword 1 adopts two, reduces the friction between cutter and workpiece, reduces heat in metal cutting, reduces tool wear,And then improve workpiece crudy; Adopt variable-diameter structure, reduced the drilling final molding stage, hole entranceThe vibration of side, has improved aperture precision and entrance quality.
In the present embodiment, get bit diameter D1For 8mm, there is two main cutting edges and every main cutting cutleryKnife face after having two, wherein the anterior angle of main cutting edge is 20 °, the first relief angle α1Be 12 °, the second relief angle α2Be 25 °, the second rear knife face 9 areas are 6 times of major first flank 8 areas, and drift angle is 90 °, front cutting edge2 helical angle is 34 °, and the axial length of reducing district C is 4mm, and diameter is 7.9mm, reducing district C'sDistance between initial position and apex point is 21.5mm, is greater than distance 5mm and the institute of the micro-tooth in the top to apex pointThe CFRP thickness of slab 9mm sum of processing, can ensure in the time of apex point and micro-tooth drilling CFRP plate reducing district CHave neither part nor lot in cutting, drilling process is comparatively stable.
As shown in the upward view of the efficient target drill of Fig. 5, by grinding main cutting edge, form chisel edge 7, chisel edgeLength will be controlled, and short during than general drilling metal material, less chisel edge is more conducive to reduce layering, butIt is the too small reduction that easily causes cutter life of chisel edge. In the present embodiment, chisel edge 7 is of a size of 0.6mm.Micro-tooth cutting region F is positioned at the front cutting edge of the first secondary cutting region B near apex point place, if micro-tooth cutting region F byA dry micro-tooth 4 forms. Micro-tooth 4 contour structure on same front cutting edge 2 is identical, and its projected outline isOval; Micro-tooth 4 distributed quantity on every front cutting edge 2 is identical, be 3, and axial location is identical,In micro-tooth 4, distance apex point micro-tooth is the most nearby positioned at the above 1.5mm of the coenvelope line place of main cutting district A. WithArticle one, the distance c in the micro-tooth 4 distributing on front cutting edge 2 between each micro-tooth is 1mm, and facewidth d is 1mm,Between micro-tooth axis 6 and tool axis 5, angle β is 95 °, and micro-tooth is helix around axis and distributes, tooth limit on micro-toothWith the angle δ of tool axis 5 be 100 °, the angle ε of micro-tooth lower tooth limit and tool axis 5 is 125 °,As shown in Figure 2.
Experiment porch adopts virtual five axle high accuracy machining centers. Drill bit material is carbide alloy, without coating.Dry-type processing, without cooling. Machine spindle speed is 3000r/min, and axial feed is 100mm/min. TestWorkpiece is every by the thick standard of the 9mm of T800 grade carbon fiber reinforced epoxy base unidirectional pre-immersion material layingSame sex composite laminated plate, is widely used in the manufacture of space shuttle, and its intensity is high, but interlayer combinationA little less than power, in processing, very easily produce layering, belong to typical difficult-to-machine material, there is good representativeness and chooseWar property, also embodies practicality of the present invention. Fig. 6, Fig. 7 express respectively the entrance that adopts target drill processingThe situation of hole and outlet opening, examines the hole quality of inlet face and exit face: entrance when the 1st hole of processingHole does not have layering, and quality is fine, and, quality is still fine when in the 5th hole of processing; While processing the 1st hole, exportHole does not have layering, and quality is fine, and, quality is still fine when in the 5th hole of processing, and visible target drill adds working mediumMeasure, precision is high, and cutter life is long.
Claims (1)
1. a target drill for carbon fibre reinforced composite high-quality drilling, this target drill toolHave the main cutting district (A) that formed by main cutting edge (1) envelope, clamp area (C), by leadingCutting edge (1) end and clamp area (C) initial position are the secondary cutting region that envelope forms(B), reducing district (D) and micro-tooth cutting region (E), it is characterized in that, this target drill is onePlant the little drift angle dextrorotation of the twolip drill bit with micro-toothing, the each main cutting edge of apex point has twoRear knife face, two main cutting edges form little drift angle structure and compared with hyphen sword, the anterior angle of main cutting edge is repaiiedMill is consistent, and front cutting edge has micro-toothing, the middle part reducing of front cutting edge; Target drillConcrete structure and parameter as follows:
Knife face (8) and (9) after every cutting edge in main cutting district (A) has two, cutterTool diameter is D1, drift angle (α) between 85 °-90 °, chisel edge length between 0.1-0.6mm,The anterior angle (γ) of main cutting edge (1) is definite value after reconditioning, anterior angle (γ) 15 °-20 ° itBetween, the first relief angle (α of main cutting edge (1)1) between 10 °-12 °, main cutting edge (1)The second relief angle (α2) between 15 °-25 °, the first relief angle (α1) and the second relief angle (α2)Ratio between 0.4-0.5, and the second rear knife face (9) area is major first flank (8)The 4-6 of area doubly; Reducing district (D) is arranged in secondary cutting region (B), reducing district (D's)Diameter is D2, its value is at (0.98-0.99) D1Between, reducing district (D) beginning reducingAxial distance (b) between position and apex point be greater than micro-tooth topmost to the distance (a) of apex point andThe carbon fibre reinforced composite thickness of slab of processing and, the axial length of reducing district (D) existsBetween 3-4mm; The helical angle of chip area is between 30 °-34 °;
Micro-tooth cutting region (E) is positioned on the front cutting edge (2) of secondary cutting region (B), micro-toothCutting region (E) is made up of several micro-teeth (4); Micro-tooth (4) is at same front cutting edge(2) upper contour structure is identical, and its projected outline is oval or circular; Micro-tooth (4) is along everyBar front cutting edge (2) is distributed with 3-5, in the upper distributed quantity phase of every front cutting edge (2)With, and axial location is identical; From apex point nearest micro-tooth (4) and main cutting district (A) knotThe positional distance of bundle, between 1-1.5mm, presss from both sides between micro-tooth axis (6) and tool axis (5)Angle (β) is 90 ° to 100 °, and micro-tooth is helix around drill axis and distributes, tooth limit on micro-toothAnd the angle (δ) of tool axis (5) is between 85 ° to 100 °, micro-tooth lower tooth limit and cutterThe angle (ε) of tool axis (5) is between 110 ° to 125 °.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610125675.8A CN105598509A (en) | 2016-03-07 | 2016-03-07 | Drill bit special for high-quality drilling of carbon fiber reinforced composite |
| PCT/CN2016/095919 WO2017028801A1 (en) | 2015-08-18 | 2016-08-18 | Micro-tooth structure having reverse cutting function and series drilling tools |
| US15/750,677 US10857601B2 (en) | 2015-08-18 | 2016-08-18 | Sawtooth structure with reversed cutting function and its drill series |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610125675.8A CN105598509A (en) | 2016-03-07 | 2016-03-07 | Drill bit special for high-quality drilling of carbon fiber reinforced composite |
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| CN105598509A true CN105598509A (en) | 2016-05-25 |
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| CN201610125675.8A Pending CN105598509A (en) | 2015-08-18 | 2016-03-07 | Drill bit special for high-quality drilling of carbon fiber reinforced composite |
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Cited By (15)
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|---|---|---|---|---|
| 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 |
| 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 |
| CN107378009A (en) * | 2017-08-01 | 2017-11-24 | 大连理工大学 | A kind of micro- serrated knife tool of multi-ladder multiple-cutting-edge gradual change for carbon fibre composite drilling |
| CN107984005A (en) * | 2017-12-26 | 2018-05-04 | 厦门西威迪新材料技术有限公司 | A kind of high efficiency drill for processing fibrous composite |
| CN108098083A (en) * | 2017-12-27 | 2018-06-01 | 四川国鑫机械制造有限公司 | Combined tap and drill |
| 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 |
| CN108979549A (en) * | 2018-08-03 | 2018-12-11 | 邹城兖矿泰德工贸有限公司 | Powder drill bit is arranged in dry type |
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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 |
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| CN107378009A (en) * | 2017-08-01 | 2017-11-24 | 大连理工大学 | A kind of micro- serrated knife tool of multi-ladder multiple-cutting-edge gradual change for carbon fibre composite drilling |
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| CN111093870A (en) * | 2017-09-07 | 2020-05-01 | Osg株式会社 | Deep hole machining method |
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Application publication date: 20160525 |