CN104500063B - A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method - Google Patents

A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method Download PDF

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Publication number
CN104500063B
CN104500063B CN201410732635.0A CN201410732635A CN104500063B CN 104500063 B CN104500063 B CN 104500063B CN 201410732635 A CN201410732635 A CN 201410732635A CN 104500063 B CN104500063 B CN 104500063B
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China
Prior art keywords
tooth
shank
hard alloy
trunk
spire
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Active
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CN201410732635.0A
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Chinese (zh)
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CN104500063A (en
Inventor
赵迎九
郭华彬
郭建锋
刘小平
陈敏
蔡运花
黄腾
吴俊龙
张丽芳
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JIANGXI YAOSHENG TUNGSTEN Co Ltd
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JIANGXI YAOSHENG TUNGSTEN Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam
    • E21C35/18Mining picks; Holders therefor
    • E21C35/183Mining picks; Holders therefor with inserts or layers of wear-resistant material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F1/00Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F7/00Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C29/00Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide

Abstract

The invention provides a kind of super coarse-grain hard alloy pick of low cobalt, including tooth tip portion, tooth head and tooth shank, wherein:Tooth tip portion includes basic courses department, trunk portion and cone portion, and basic courses department is formed with class face and with bottom surface with trunk portion;Tooth head is placed on tooth tip portion periphery, and including the centre bore through its bottom and top, centre bore is divided into upper and lower section, epimere is counter sink, hypomere is screwed hole, and counter sink has supporting surface and a parallel surface, and supporting surface is fitted with class face, so that cone portion protrusion is in tooth head top, parallel surface now then forms burnishing surface with bottom surface;Tooth shank has spire, shank and withstanding part, spire, which has top and tightened with screwed hole, to be connected, the combination constructed by aforementioned structure, solve the technical problem of the super coarse-grain hard alloy pick of low cobalt, reach lifting alloy pick toughness, hardness, and reduce manufacturing cost and the good result increased operation rate.

Description

A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method
Technical field
The present invention provide a kind of alloy pick suitable for excavator, espespecially a kind of super coarse-grain hard alloy pick of low cobalt and its Manufacture method.
Background technology
There is the requirement of anticorrosive, high rigidity and high tenacity in order to meet excavator pick, pick typically uses WC hard Alloy (including tungsten powder, cobalt powder) material and through mould, punching press, grinding and and the modes of WEDM electro-discharge machinings be molded.So And, coarse grain WC has the series of advantages such as microstructural flaws are few, crystallite dimension is big, micro-hardness is high, microstrain is small, leads to Cross and suitably adjusted itself and cobalt content, toughness can be obtained and hardness matches the good super coarse-grain hard alloy of low cobalt.So And, Hardmetal materials assemble processing and should accomplished:
1. uniformity.The crystal structure of uniformity, minimum impurity and highest cleanliness factor are Hardmetal materials There is durable, wearability mark after shaping.
2. avoid porous.Porous is the purity and the whether fine standard of production technology for verifying raw material.Porous degree is got over Height, wear intensity and the danger fractureed are higher.
3. improve hardness.The mixing of raw material powder and the size of crystal grain determine the hardness of sintering instrument.In hardness With processing tasks it is well matched in the case of, wear intensity is then smaller.
4. reduce fracture strength.It is easily broken off, illustrates hard alloy poor quality.
5. it is wear-resistant.Hard alloy should also have enough rigidity except that should have high wear resistance.
On this basis, the present inventor has anticorrosive, high rigidity and high tenacity by research, experiment there is provided one kind The super coarse-grain hard alloy pick of low cobalt and its manufacture method.
The content of the invention
In order to solve the above technical problems, a kind of with anticorrosive, high rigidity and height it is a primary object of the present invention to provide The super coarse-grain hard alloy pick of low cobalt and its manufacture method of toughness.
To reach above-mentioned purpose, the technical scheme that the present invention is applied is:A kind of super coarse-grain hard alloy pick of low cobalt, including Tooth tip portion, tooth head and tooth shank, wherein:Described tooth tip portion is in boss-shaped, using the Talide system of high rigidity Into, and the trunk portion that is upwardly extended including basic courses department and cone portion, the basic courses department and trunk portion shape are provided with trunk portion top Into having class face and with bottom surface;Described tooth head is frustum, is placed on tooth tip portion periphery, its use high tenacity, The hard alloy in low cobalt of wear resistence is made, and including having through the tooth head bottom and the centre bore at top and its underpart Ring part, the centre bore is divided into two sections, and epimere is the counter sink for housing the tooth tip portion, and hypomere is and the tooth shank The screwed hole being connected, the counter sink has supporting surface and a relative supporting surface formation scalariform parallel surface, the supporting surface with it is described Class's face laminating so that the cone portion protrusion is in the tooth head top, and the parallel surface now then forms flat with the bottom surface Whole face;Described tooth shank has spire, shank and the withstanding part between the shank and spire, and the spire has Top and being tightened with the screwed hole is connected.
In embodiments of the present invention preferably, the super coarse-grain hard alloy pick of described low cobalt further comprises layer, the weldering Layer is to weld the bottom surface with the spire top by concentrating pricker liquid on to be formed.
In embodiments of the present invention preferably, described basic courses department is cylindric with trunk portion, and the diameter of its basic courses department is big Show in the diameter of the trunk portion, and between both in same axis and in superposition situation, and be thereby formed with class face.
In embodiments of the present invention preferably, described cone portion is located at the trunk portion top surface, and its cone portion bores the week at bottom The long girth equal to or less than trunk portion top surface, depressed part is additionally provided with the cone portion surface.
In embodiments of the present invention preferably, described ring part periphery has been inwardly indented annular groove.
In embodiments of the present invention preferably, described withstanding part is in the shape of falling control tower and with face is held, when the spire When being tightened with the screwed hole, this holds face and pushes against tooth head bottom.
To reach above-mentioned purpose, the technical scheme that the present invention is applied is:A kind of system of the super coarse-grain hard alloy pick of low cobalt Method is made, wherein:The manufacture method includes:First, raw material needed for tooth tip portion, tooth head and each component of tooth shank are mixed Combined group;Secondly, it is molded respectively using liquid forging forming method;Again, with liquid forging technology, formed by concentrating pricker liquid on Layer is simultaneously closely integrally welded with tooth shank by tooth tip portion;Finally, tightened by screwed hole with spire so that tooth tip portion, Tooth head and tooth shank this three are integrally formed.
In embodiments of the present invention preferably, the material composition and mixing process on described tooth head are:By cobalt powder 5-7%, Tungsten carbide powder 86.4-92.6%, chromium powder 0.1-0.6%, rhenium powder 2-5%, iron powder 0.3-1% and the mixing of appropriate agglutinant, then add Enter alcohol wet-milling, obtain mixed material;The mixed material is put into drying box again, 25-40 is dried under conditions of 85-100 DEG C Hour.
In embodiments of the present invention preferably, the method for forming on described tooth head is first sizing, again dumping, is then sintered, its In:
Sizing:Using mixed material, the buna gasoline solution that bond quality concentration is 5% is with 100-200ml/kg's Added with bonding agent is used in dried mixed material, granulate, sieve under conditions of 28-32Mpa and pressurize 15s, Be molded under conditions of 39-42Mpa and pressurize 15s it is preforming, by under 200MPa isostatic cool pressing it is compressing, obtain green compact;
Dumping:After green compact are dried, dumping processing is done in 500-600 DEG C of vacuum drying oven;
Sintering:Under 100-200Pa vacuum condition, by the green compact after dumping after 135-1400 DEG C is incubated 1-2 hours Furnace cooling.
In embodiments of the present invention preferably, described layer thickness is 2-3mm.
The present invention compared with prior art, its beneficial effect:By adjusting alloy material cobalt content, alloy is not only lifted The toughness and hardness of pick, and reduce manufacturing cost and improve service efficiency.
Brief description of the drawings
Fig. 1 is the schematic perspective view of the embodiment of the present invention.
Fig. 2 is the exploded perspective view of the embodiment of the present invention.
Fig. 3 is the explosive view at another visual angle of the embodiment of the present invention.
Fig. 4 is the partial cutaway schematic of the embodiment of the present invention.
Fig. 5 is the partial cutaway schematic on tooth head in Fig. 4.
Fig. 6 is schematic diagram of the embodiment of the present invention by die manufacture.
Embodiment
The present invention is described in further detail with reference to specific embodiment and accompanying drawing.The example of the embodiment is attached Shown in figure, wherein same or similar label represents same or similar element or with same or like function from beginning to end Element.The embodiments described below with reference to the accompanying drawings are exemplary, is only used for explaining technical scheme, without It should be understood to limitation of the present invention.
In the description of the invention, term " interior ", " outer ", " longitudinal direction ", " transverse direction ", " on ", " under ", " top ", " bottom " etc. refer to The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of description the present invention rather than It is required that the present invention must be with specific azimuth configuration and operation, therefore it is not construed as limitation of the present invention.
Refer to Fig. 1 and with reference to refering to shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, closed the invention provides the super coarse-grain hard of low cobalt Golden pick and its manufacture method, the super coarse-grain hard alloy pick of the low cobalt include tooth tip portion 10, tooth head 20 and tooth shank 30, its In:
Described tooth tip portion 10 is in boss-shaped, is made of the Talide of high rigidity, and including basic courses department 11 The trunk portion 12 that upwardly extends and it is provided with cone portion 13 on trunk portion top.The basic courses department 11 is cylinder with trunk portion 12 Shape, its basic courses department 11 has bottom surface 111, has a diameter larger than the diameter of the trunk portion 12, and be in same axis simultaneously between both Show in superposition situation, be thereby formed as class face 112.Meanwhile, the cone portion 13 is located at the top surface of trunk portion 12, its cone The girth at the cone bottom in portion 13 is equal to or less than the girth of the top surface of trunk portion 12.Where applicable, in order to increase frictional force and be easy to point Fine slag is unloaded, depressed part 131 is additionally provided with the surface of cone portion 13;
Described tooth head 20 is frustum, can be placed on the periphery of the tooth tip portion 10, and it uses high tenacity, wear resistence Hard alloy in low cobalt is made, and the ring including having through the bottom of tooth head 20 and the centre bore 21 at top and its underpart Shape portion 22, is inwardly indented in the periphery of the ring part 22 and is formed with annular groove 221.In the present embodiment, the centre bore 21 It is divided into two sections, epimere is the counter sink 211 for housing the tooth tip portion 10, and hypomere is the screw thread that can be connected with tooth shank 30 Hole 212, the counter sink 211 has supporting surface 2112 and the relative supporting surface 2112 formation scalariform parallel surface 2111, should during assembling Supporting surface 2112 is fitted with the class face 112 so that the cone portion 13 is protruded at the top of the tooth head 20, and now this Parallel surface 2111 and the bottom surface 111 of the basic courses department 11 are then formed as burnishing surface, with this so that being assembled in the institute in counter sink 211 Stating tooth head 20 will not prolapse upwards;
Described tooth shank 30, which has spire 31 and thereby tightened with the screwed hole 212, to be connected, now the crown Portion 10 by layer 40 and the melting welding of tooth shank 30 and can also be connected.In the present embodiment, the tooth shank 30 also includes handle Portion 32 and its withstanding part 33 between the shank 32 and spire 31, the withstanding part 33 is in the shape of falling control tower and with holding Face 331, when the spire 31 is tightened with the screwed hole 212, this holds face 331 and pushes against the bottom of tooth head 20, is used to Support the tooth head 20 downwards or stress forward, while also making the tooth head 20 not deviate from downwards in counter sink 211. In the present embodiment, the layer 40 is to be welded in the bottom surface 111 to be formed with the free top end 313 of spire 31, thereby may be used So that effectively the tooth tip portion 10 and tooth shank 30 to be fixed as one.In the present embodiment, the shank 32 includes latch part 321, the latch part 321 is the structure to coordinate and other (including excavator, drilling machine and coal-winning machine) relevant devices are, Because of the design focal point of the structure and non-invention, it is not described in detail herein.
Please refer to shown in Fig. 6, the invention provides the super coarse-grain hard alloy pick of low cobalt and its manufacture method, this is low The super coarse-grain hard alloy pick manufacture method of cobalt includes:First, to needed for tooth tip portion 10, tooth head 20 and each component of tooth shank 30 Raw material carry out mixing and assembled;Secondly, it is molded respectively using liquid forging forming method;Again, by the tooth tip portion 10 of shaping with The method that tooth shank 30 uses liquid forging (including concentrating pricker liquid formation layer 40 on) so that both is closely as one (such as Fig. 6);Finally, tightened by the screwed hole 212 on tooth head 20 with the spire 31 of tooth shank 30 so that tooth tip portion 10, tooth Head 20 and tooth shank 30 this three are integrally formed, wherein:
The first step:Mixing is carried out to raw material needed for tooth tip portion 10, tooth head 20 and each component of tooth shank 30 to assemble, its In:The tooth tip portion 10, the material component of tooth shank 30 are prior art, therefore are not described in detail herein.However, for described Tooth head 20 material assemble and its process for, WC grain intensity is improved using extra-coarse grained, because WC is brilliant Grain is thicker so that defect reduces and improves WC grain intensity in WC grain.However, WC grain specific surface area is reduced, make conjunction Golden cobalt layers are thickened, so that the cobalt content improved in the impact flexibility of alloy, alloy is reduced and the increase of WC content makes the resistance to of alloy Mill property is improved, and is also beneficial to improve the thermal conductivity of alloy, is dropped low-alloyed thermal coefficient of expansion.When WC grain size reaches 5.0um During the above, hard alloy while good intensity is kept, plasticity be improved significantly, product reliability is greatly improved, because This, the super coarse-grain hard alloy of low cobalt has high thermal conductivity and a low coefficient of expansion simultaneously, preferable fracture toughness, harder strong Degree and resistance to elevated temperatures, some special use requirements such as hard coal seam and hard rock driving above, thereby promote in meeting Mining, the development of digging tool.To sum up and combine the embodiment of the present invention and manufacturing and designing, tooth head 20 described in it be exactly according to It is achieved according to this theory, for example, in the present invention, described tooth head 20, its material composition and mixing process are:Will Cobalt powder 5-7%, tungsten carbide powder 86.4-92.6%, chromium powder 0.1-0.6%, rhenium powder 2-5%, iron powder 0.3-1% and appropriate agglutinant Mixing, adds alcohol wet-milling, obtains mixed material;The mixed material is put into drying box again, in 85-100 DEG C of condition Lower baking 25-40 hours.
Second step:Liquid forging forming method is respectively adopted so that the tooth tip portion 10, tooth head 20 and tooth shank 30 into Type, wherein:The tooth tip portion 10, the forming method of tooth shank 30 belong to prior art, no longer explain herein.However, described The method of forming on tooth head 20 be:(1) shaped using the mixed material in the first step, mass concentration is received for 5% fourth Rubber gasoline solution is added in dried batch mixing with 100-200ml/kg with bonding agent is used for, in 28-32Mpa and pressurize Under conditions of 15s granulate, sieve, be molded under conditions of 39-42Mpa and pressurize 15s it is preforming, by cold etc. under 200MPa Static pressure is compressing, obtains green compact;(2) dumping:After green compact are dried, dumping processing is done in 500-600 DEG C of vacuum drying oven; (3) sinter:It is cold with stove after the green compact after dumping are incubated into 1-2 hours at 135-1400 DEG C under 100-200Pa vacuum condition But, hard alloy in low cobalt material is obtained, thereby the described tooth head 20 of process shaping, its experimental result is:
Rockwell hardness (HRC) is measured using MC010-HRS-150 digital display Rockwell apparatuses:70-72;
Vickers hardness (HV) is measured using JMTT HVC-10A1 micro Vickerses:
A. loading environment 200g/15s 1252-1286;
B. loading environment 500g/15s 1053-1148.
The loading speed of three-point bending resistance intensity is measured using INSTRON1195 types (8800 control system) electronic universal tester Spend 1mm/min2180-2430MPa.
3rd step:The tooth tip portion 10 of shaping and tooth shank 30 are used into liquid forging (referring to shown in Fig. 6) and to concentrate on The method of pricker liquid formation layer 40 so that both is closely as one, and its specific process is:By tooth tip portion 10 with Its bottom surface 111 is embedded in mould 50 and is heated to 200-350 DEG C upward, then after concentrating fusing point on for 800-900 DEG C of pricker liquid, will warm up 150-300 DEG C of tooth shank 30 (such as spire 31 is downward and is directed at tooth tip portion bottom surface 111), hangs down by the way that relevant device is (not shown) Vertical compression enters die cavity so that tooth tip portion 10 is welded as a whole with tooth shank 30, and the thickness for welding the pricker layer 40 formed is 2-3mm.
4th step:Tightened by the screwed hole 212 on tooth head 20 with the spire 31 of tooth shank 30 so that tooth tip portion 10, Tooth head 20 and tooth shank 30 this three are integrally formed.
5th step:Quenching and tempering processing.The super coarse-grain hard alloy pick of the low cobalt of shaping is reheated and made at quenching Reason, is heated to temperature in 8 hours after quenching and carries out temper, thereby improve the wear resistence of pick.Described quenching, return Fiery temperature is the material that is used according to pick to determine, generally prior art identical processing method, is not remake herein in detail Repeat.

Claims (5)

1. a kind of super coarse-grain hard alloy pick of low cobalt, including tooth tip portion, tooth head and tooth shank, it is characterised in that:Described Tooth tip portion is in boss-shaped, is made of the Talide of high rigidity, and including trunk portion that basic courses department upwardly extends with And cone portion is provided with trunk portion top, depressed part is additionally provided with the cone portion surface, the basic courses department is formed with rank with trunk portion Level face simultaneously has bottom surface;Described tooth head is frustum, is placed on the tooth tip portion periphery, it uses high tenacity, wear resistence Hard alloy in low cobalt be made, and the annular including having through the tooth head bottom and the centre bore at top and its underpart Portion, the centre bore is divided into two sections, and epimere is the counter sink for housing the tooth tip portion, and hypomere is to be connected with the tooth shank Screwed hole, the counter sink has supporting surface and relative supporting surface formation scalariform parallel surface, the supporting surface and the class face Laminating so that the cone portion protrusion then forms burnishing surface in the tooth head top, the parallel surface now with the bottom surface;Institute The tooth shank stated has spire, shank and the withstanding part between the shank and spire, and the spire has top simultaneously Tighten and be connected with the screwed hole;Described withstanding part is in the shape of falling control tower and with face is held, when the spire and the spiral shell When pit is tightened, this holds face and pushes against tooth head bottom;The super coarse-grain hard alloy pick of described low cobalt further comprises Layer, the layer is to weld the bottom surface with the spire top by concentrating pricker liquid on to be formed;The manufacture method bag of pick Include:First, mixing is carried out to raw material needed for tooth tip portion, tooth head and each component of tooth shank to assemble;Secondly, using liquid forging Forming method is molded respectively;Again, with liquid forging technology, layer is formed and tooth tip portion and tooth shank is tight by concentrating pricker liquid on It is close integrally welded;Finally, tightened by screwed hole with spire so that tooth tip portion, tooth head and tooth shank this three turn into One;Described layer thickness is 2-3mm.
2. the super coarse-grain hard alloy pick of low cobalt as claimed in claim 1, it is characterised in that:Described basic courses department and trunk portion Cylindric, the diameter with diameter greater than the trunk portion of its basic courses department is, and in same axis and in superposition state between both Gesture shows, and is thereby formed with class face.
3. the super coarse-grain hard alloy pick of low cobalt as claimed in claim 2, it is characterised in that:Described cone portion is located at described Trunk portion top surface, the girth at its cone portion cone bottom is equal to or less than the girth of trunk portion top surface.
4. the super coarse-grain hard alloy pick of low cobalt as claimed in claim 3, it is characterised in that:Described ring part periphery is inwardly Retraction has annular groove.
5. the manufacture method of the super coarse-grain hard alloy pick of low cobalt as claimed in claim 4, it is characterised in that described tooth head The material in portion is constituted and mixing process is:By cobalt powder 5-7%, tungsten carbide powder 86.4-92.6%, chromium powder 0.1-0.6%, rhenium powder 2- 5%th, iron powder 0.3-1% and the mixing of appropriate agglutinant, add alcohol wet-milling, obtain mixed material;Again by the mixed material Drying box is put into, is dried 25-40 hours under conditions of 85-100 DEG C;The method of forming on described tooth head is first sizing, dumping again, Then sinter, wherein:
Sizing:Using mixed material, the buna gasoline solution that bond quality concentration is 5% is with 100-200ml/kg proportioning Added as bonding agent in dried mixed material, granulate, sieve, in 39- under conditions of 28-32Mpa and pressurize 15s Be molded under conditions of 42Mpa and pressurize 15s it is preforming, by under 200MPa isostatic cool pressing it is compressing, obtain green compact;
Dumping:After green compact are dried, dumping processing is done in 500-600 DEG C of vacuum drying oven;
Sintering:Under 100-200Pa vacuum condition, with stove after the green compact after dumping are incubated into 1-2 hours at 135-1400 DEG C Cooling.
CN201410732635.0A 2014-12-07 2014-12-07 A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method Active CN104500063B (en)

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CN106351657A (en) * 2016-10-09 2017-01-25 杨岗 Novel cutting pick
CN107060754B (en) * 2017-04-11 2018-12-14 中车株洲电力机车有限公司 A kind of top bore pick and its cutterhead

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US5098167A (en) * 1990-10-01 1992-03-24 Latham Winchester E Tool block with non-rotating, replaceable wear insert/block
US5456522A (en) * 1991-10-14 1995-10-10 Kennametal Inc. Concave cutter bit
CN101509375A (en) * 2009-03-23 2009-08-19 中南大学 Inlaid diamond-cemented carbide strong wear resistant pick and producing technique thereof
CN102220532B (en) * 2011-05-24 2013-02-13 苏州新锐硬质合金有限公司 Extra-coarse crystal grain carbide alloy material used for cutting pick or road excavation teeth, and preparation method thereof
CN203441492U (en) * 2013-07-31 2014-02-19 杨岗 Reinforced cutting tooth
CN103866173B (en) * 2014-03-06 2016-08-17 西安交通大学 A kind of Hardmetal materials of pick cutter head for coal-winning machine and preparation method thereof
CN104047604B (en) * 2014-06-10 2016-05-18 高建军 A kind of composite cutter bit and manufacture method thereof

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