CN203197323U - Brazed-structure diamond drill bit for carbon fiber reinforced composite material - Google Patents
Brazed-structure diamond drill bit for carbon fiber reinforced composite material Download PDFInfo
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- CN203197323U CN203197323U CN 201320069573 CN201320069573U CN203197323U CN 203197323 U CN203197323 U CN 203197323U CN 201320069573 CN201320069573 CN 201320069573 CN 201320069573 U CN201320069573 U CN 201320069573U CN 203197323 U CN203197323 U CN 203197323U
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Abstract
The utility model relates to a brazed-structure diamond drill bit for carbon fiber reinforced composite material, and at present a cutter for drilling the carbon fiber reinforced composite material does not exist yet. Currently, a composite material application department mainly adopts YG hard alloy twist drills such as an YG6X drill, an YG8 drill and an Y330 drill. The cutter is easy to manufacture, low in cost and low in requirement for machine tool equipment, and cutter sharpening is easy. But the cutter is short in service life, and generally after drilling 30-40 holes, the cutter needs to be sharpened. The brazed-structure diamond drill bit for the carbon fiber reinforced composite material comprises a cutter handle (1) and a cutter body (2) connected with the cutter handle (1), a chip-clearing hole (3) is formed in the side wall of the cutter body, and the drill bit (4) is connected with the head of the cutter body and provided with a set of notches (5). The brazed-structure diamond drill bit for the carbon fiber reinforced composite material is used for drilling machining of the carbon fiber composite material in spacecrafts and artistic motorcycles.
Description
Technical field:
The utility model relates to a kind of machining tool, particularly a kind of drilling tool of processing carbon fibre composite.
Background technology:
The opportunity of combat of being on active service after the eighties in 20th century all adopts carbon fibre reinforced composite in a large number, and the consumption of composite has become one of important indicator of weighing aeroplane performance.For example, the composite consumption of France's fitful wind opportunity of combat accounts for 40%, and Sweden's JAS39 opportunity of combat accounts for 30%, and Europe " typhoon " opportunity of combat is greater than 40%, the trump card weapon B-2 strategic bomber of the U.S. accounts for 50%, and up-to-date F-22 " bird of prey " the fighter plane composite consumption of USAF has reached 35%.1984, toray company successfully developed the carbon fiber T800H of high strength, big elongation, 1986, researches and develops successful T1000 again.Subsequently, Japanese eastern nation, mitsubishi rayon and U.S. Hexcel company develop similar high-performance carbon fibre in succession, provide advanced composite material (ACM) for making big aircraft.From then on, the consumption straight line rising carbon fibre reinforced composite of carbon fibre reinforced composite on big aircraft has advantages such as specific strength height, specific modulus height, vibration damping are good, obtained extensive use at aerospace field, also increasing in the application of industries such as automobile, medicine equipment, sports apparatus.
Along with the expansion of carbon fibre reinforced composite with the field, the high accuracy, the highly-efficient processing problem that solve carbon fibre reinforced composite are also urgent day by day.Boring adds man-hour on the carbon fibre reinforced composite, is easy to generate defectives such as layering, splitting, burn, wherein with layering, splitting crudy is had the greatest impact especially.It is introduced that in the manufacturing of AV-8B aircraft, the part disqualification rate that the layering because carbon fibre reinforced composite is holed, splitting cause accounts for more than 60% of full machine carbon fibre reinforced composite part disqualification rate.The main cause that layering, splitting phenomenon occur is: (1) carbon fibre reinforced composite laminated plate is formed by the carbon fiber layer laying, layer with layer between with resin-bonded.Because carbon fibre reinforced composite is a kind of anisotropic material, its mechanical performance has nothing in common with each other at different directions, material is higher along fiber lay down layer direction intensity, intensity perpendicular to fiber lay down layer direction then depends on resin-bonded intensity, generally speaking, interfacial bonding strength only is 2.2% of machine direction intensity.(2) boring adds man-hour, existence is perpendicular to the axial force F z of fiber lay down layer direction, thereby in laminated plate, produce direct stress, the direct stress that produces when cutting force surpasses resin-bonded intensity, phenomenons such as resin fracture, fibrage layering or splitting then can appear, axial force is more big, and layering, splitting phenomenon are more serious.An effective way of therefore, solution layering, splitting problem is to reduce the drilling axial force.In drilling processing, axial force mainly is subjected to factor affecting such as drilling parameter, cutter material and brill type.China does not also have the dedicated tool of drilling carbon fibre reinforced composite at present.Composite is used department's main yg-type carbide fluted drill that adopts at present, as YG6X, YG8 and Y330.This cutter manufacturing is simple, and cost is low, is easy to sharpening, requires low to machine tool.But service life is low, behind general 30 ~ 40 holes of drilling, just need carry out sharpening.In order to improve the service life of cutter, some cutter manufacturer tool setting tools carry out face coat to be handled, as nitrogen titanium aluminide coating and diamond coatings.
Summary of the invention:
The utility model provides a kind of special diamond drill bit of carbon fibre reinforced composite of braze-welded structure, effectively solves carbon fibre reinforced composite layering, splitting problem.
The purpose of this utility model is achieved in that
A kind of special diamond drill bit of carbon fibre reinforced composite of braze-welded structure, its composition comprises: the cutter hub of handle of a knife, the described handle of a knife of connection, have at described cutter hub sidewall and to consider the hole clearly to be worth doing, connect drill bit at the head of described cutter hub, described drill bit has one group of notch.
The special diamond drill bit of the carbon fibre reinforced composite of described braze-welded structure, the head of described cutter hub connects described drill bit by high temperature brazing, and described notch is 4, and diamond grit is the 40-45 order, be distributed on the position of cutting edge, cone-apex angle 45-48 °.
The special diamond drill bit of the carbon fibre reinforced composite of described braze-welded structure, described clear bits hole is slotted hole.
The special diamond drill bit of the carbon fibre reinforced composite of described braze-welded structure, described outside diameter are 3-14mm, and wall thickness 1.1mm guide hole drill diameter is the 25%-32% of outside diameter.
The special diamond drill bit of the carbon fibre reinforced composite of described braze-welded structure, described outside diameter is 6mm or 8mm or 10mm or 12mm or 14mm, wall thickness 1.1mm guide hole drill diameter is 30% of outside diameter, and the diameter difference between the diameter difference between each grade that described guide hole bores and described guide hole brill and the described drill bit is not more than 6mm, adopts the ladder guide hole to bore when finally outside diameter is greater than 9mm.
Beneficial effect:
Conical section of the present utility model has two spiral helicine chip dividing grooves of symmetry, plays and holds bits, chip removal effect, can avoid smear metal obstruction, burn workpiece.
Guide hole has bored the prebored hole effect, serves as that the zero machining condition that causes worsens to avoid the boring core place because of cutting speed.The minor diameter guide hole bores and also can produce small cutting defective, but since its diameter range less than final aperture, can be cut in the diamond bit drilling process.
Diamond cutter of the present utility model has advantages such as point of a knife is sharp, multiple cut, excellent in abrasion resistance, therefore very is suitable for the machining of difficult-to-machine material.Because be multiple cut during the diamond bit drilling, axial force is disperseed, the suffered direct stress of finished surface also significantly descends.In addition, because apex point is sharp, the carbon-fiber reinforced composite fiber breaking strain is little during drilling, thereby has alleviated layering, splitting degree.Too little as drift angle in actual the use, the drilling time will prolong, and workpiece is easily burnt; Excessive as drift angle, then drilling axial force increases, the easy layering of workpiece, splitting.Matrix cone-apex angle of the present utility model is selected 45 °-48 for use, has optimum efficiency.The mode of employing step drill of the present utility model is led and is bored part and get 1/3 of workpiece aperture, experimental results show that diameter too senior general increase the weight of layering and splitting.The drilling axial force is along with the diameter of cutter increases and increases.This is because of the increase along with tool diameter, and the drill edge area of cut increases, thereby causes cutting force to increase.
The typical difficult-to-machine material that carbon fibre reinforced composite and titanium alloy all are, carbon fibre reinforced composite drilling require high rotating speed and the little amount of feeding, and general the employing done cutting in the drilling process.The titanium alloy thermal conductivity factor is little, and that elasticity is recovered is big, chill, bonding, diffusion phenomena are serious, is easy to oxidation, resilience is arranged, the size instability in the drilling.When adopting electroplated diamond composite drill bit drilling of the present utility model, axial force and moment of torsion are all less, be about 30% and 70% of ordinary rigid alloy bit respectively, so the hole crudy improve obviously.Cutting tests of drilling result shows, under the machining condition of high speed, low feeding, can obtain very desirable finished surface with electroplated diamond composite drill bit of the present utility model.
The utility model manufacturing process is simple, and the cost of charp tool is low; Owing to have advantages such as point of a knife is sharp, multiple cut, this drill bit can obviously be boosted productivity at a high speed, under the low feeding condition during drilling carbon fibre reinforced composite sheet material, do not have layering, splitting phenomenon substantially.
The utility model adopts coating technology, and along with the increase of boring number, the axial force of drill bit increases gradually.This is because of the increase along with the boring number, and the bit wear amount increases, thereby causes axial force to increase.After the coating, Tool in Cutting sword rust.But boring certain hole number (20 hole) afterwards, the coating material has well improved the wearability of cutter.The coated drill wearing and tearing are minimum.
The entrance quality of braze welding diamond cylindrical drill machining hole of the present utility model is obviously good than hard alloy twist drill, but outgoing quality is not as the latter.The porch, because the diamond abrasive grain cutting edge of braze welding diamond cylindrical drill is very short, when abrasive particle was cut material simultaneously, the outer shear stress of the face of generation was less, was difficult for making fibrage to be started and produced tearing defect; And the hard alloy twist drill cutting edge is longer, and when drill bit incision material, main cutting edge outside positive rake angle part has a bigger outer shear stress of face to skin-material, tears phenomenon thereby cause skin-material to be started generation; But in the exit, because the braze welding diamond cylindrical drill is from piercing laminate to getting out laminate, its drill thrust is to be increased to maximum rapidly from zero, keep stable after, reduce to zero rapidly.Therefore when the drilling bottom fiber, material opposing tension deformation ability is very weak, and drill thrust does not reduce, greater than the interlaminar strength of material this moment, so be easy to generate tearing defect.The reverse be true in this performance and the conventional art, for traditional hard alloy twist drill, its cutting edge is longer, and the cutting edge length that participates in cutting in the exit reduces gradually, and drill thrust also diminishes gradually, therefore can produce a contrary effect.
One of carbon fibre composite processing characteristics is exactly that tool wear is serious, and tool life is low.Utilize common hard alloy twist drill processing back rake face serious tipping and wearing and tearing to occur.In addition, in various degree wearing and tearing and tipping all appear in main cutting edge and front cutting edge and chisel edge.Adopt diamond cylindrical drill of the present utility model to process after the hole of same quantity, obscission does not all appear in the diamond abrasive grain on the cutter, and just the solder at the inboard chamfering of drill bit section place is worn away a lot.This is to utilize high temperature brazing technology to make diamond and matrix material realize combination because of the used braze welding diamond cylindrical drill of test, because this high temperature brazing technology has realized the chemical metallurgy combination on diamond, solder and the metallic matrix interface, can assert that the diamond abrasive grain that the utility model adopts has high bond strength and wearability.
Description of drawings:
Accompanying drawing 1 is structural representation of the present utility model.
Accompanying drawing 2 is the utility model soldering cylindrical drill end face structure schematic diagrames.
The specific embodiment:
Embodiment 1:
A kind of special diamond drill bit of carbon fibre reinforced composite of braze-welded structure, its composition comprises: the cutter hub 2 of handle of a knife 1, the described handle of a knife of connection, have at described cutter hub sidewall and to consider hole 3 clearly to be worth doing, connect drill bit 4 at the head of described cutter hub, described drill bit has one group of notch 5.
Embodiment 2:
The special diamond drill bit of the carbon fibre reinforced composite of embodiment 1 described braze-welded structure, the head of described cutter hub connects described drill bit by high temperature brazing, and described notch is 4, and diamond grit is the 40-45 order, be distributed on the position of cutting edge, between cone-apex angle 45-48 °.
Embodiment 3:
The special diamond drill bit of the carbon fibre reinforced composite of embodiment 1 or 2 described braze-welded structures, described clear bits hole is slotted hole.
Embodiment 4:
The special diamond drill bit of the carbon fibre reinforced composite of embodiment 1 or 2 or 3 described braze-welded structures, described outside diameter are 3-14mm, wall thickness 1.1mm, and described drill bit is anterior for guide hole bores, and the guide hole drill diameter is the 25%-32% of outside diameter.
Embodiment 5:
The special diamond drill bit of the carbon fibre reinforced composite of embodiment 1 or 2 or 3 or 4 described braze-welded structures, described outside diameter is 6mm or 8mm or 10mm or 12mm or 14mm, wall thickness 1.1mm guide hole drill diameter is 30% of outside diameter, and the diameter difference between the diameter difference between each grade that described guide hole bores and described guide hole brill and the described drill bit is not more than 6mm, adopts the ladder guide hole of multi-ladder to bore when finally outside diameter is greater than 9mm.
Claims (5)
1.
A kind of special diamond drill bit of carbon fibre reinforced composite of braze-welded structure, its composition comprises: the cutter hub of handle of a knife, the described handle of a knife of connection, it is characterized in that: have at described cutter hub sidewall and consider the hole clearly to be worth doing, at the head connection drill bit of described cutter hub, described drill bit has one group of notch.
2.
The special diamond drill bit of the carbon fibre reinforced composite of braze-welded structure according to claim 1, it is characterized in that: the head of described cutter hub connects described drill bit by high temperature brazing, described notch is 4, diamond grit is the 40-45 order, be distributed on the position of cutting edge, cone-apex angle 45-48 °.
3.
The special diamond drill bit of the carbon fibre reinforced composite of braze-welded structure according to claim 1 and 2 is characterized in that: described clear bits hole is slotted hole.
4.
The special diamond drill bit of the carbon fibre reinforced composite of braze-welded structure according to claim 3 is characterized in that: described outside diameter is 3-14mm, and wall thickness 1.1mm guide hole drill diameter is the 25%-32% of outside diameter.
5.
The special diamond drill bit of the carbon fibre reinforced composite of braze-welded structure according to claim 3, it is characterized in that: described outside diameter is 6mm or 8mm or 10mm or 12mm or 14mm, wall thickness 1.1mm guide hole drill diameter is 30% of outside diameter, and the diameter difference between the diameter difference between each grade that described guide hole bores and described guide hole brill and the described drill bit is not more than 6mm, adopts the ladder guide hole to bore when finally outside diameter is greater than 9mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069573 CN203197323U (en) | 2013-02-06 | 2013-02-06 | Brazed-structure diamond drill bit for carbon fiber reinforced composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320069573 CN203197323U (en) | 2013-02-06 | 2013-02-06 | Brazed-structure diamond drill bit for carbon fiber reinforced composite material |
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| Publication Number | Publication Date |
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| CN203197323U true CN203197323U (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320069573 Expired - Fee Related CN203197323U (en) | 2013-02-06 | 2013-02-06 | Brazed-structure diamond drill bit for carbon fiber reinforced composite material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071833A (en) * | 2013-02-06 | 2013-05-01 | 哈尔滨理工大学 | Diamond bit with brazing structure specially used for carbon fiber reinforced composite material |
| CN105458353A (en) * | 2015-12-15 | 2016-04-06 | 中国民航大学 | Diamond-electroplated tool for drilling of fiber reinforced composite material |
| CN105921794A (en) * | 2016-06-21 | 2016-09-07 | 哈尔滨理工大学 | Welded type blade used for CFRP drilling machining |
| CN107538626A (en) * | 2017-10-16 | 2018-01-05 | 内蒙金属材料研究所 | A kind of diamond bit |
-
2013
- 2013-02-06 CN CN 201320069573 patent/CN203197323U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103071833A (en) * | 2013-02-06 | 2013-05-01 | 哈尔滨理工大学 | Diamond bit with brazing structure specially used for carbon fiber reinforced composite material |
| CN105458353A (en) * | 2015-12-15 | 2016-04-06 | 中国民航大学 | Diamond-electroplated tool for drilling of fiber reinforced composite material |
| CN105921794A (en) * | 2016-06-21 | 2016-09-07 | 哈尔滨理工大学 | Welded type blade used for CFRP drilling machining |
| CN107538626A (en) * | 2017-10-16 | 2018-01-05 | 内蒙金属材料研究所 | A kind of diamond bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20140206 |