CN104500063A - Low-cobalt extra coarse grain cemented carbide cutting pick and manufacturing method thereof - Google Patents
Low-cobalt extra coarse grain cemented carbide cutting pick and manufacturing method thereof Download PDFInfo
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- CN104500063A CN104500063A CN201410732635.0A CN201410732635A CN104500063A CN 104500063 A CN104500063 A CN 104500063A CN 201410732635 A CN201410732635 A CN 201410732635A CN 104500063 A CN104500063 A CN 104500063A
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- 239000010941 cobalt Substances 0.000 title claims abstract description 36
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 40
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 39
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 12
- 239000011230 binding agent Substances 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000005242 forging Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 241001080061 Talides Species 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 3
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000011068 loading method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 208000012287 Prolapse Diseases 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture 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
- B22F7/06—Manufacture 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys 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
- C22C29/08—Alloys 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Earth Drilling (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides a low-cobalt extra coarse grain cemented carbide cutting pick, which comprises a pick tip, a pick head and a pick shank, wherein the pick tip comprises a foundation part, a cylinder part and a cone part, and the foundation part and the cylinder part form a step surface; the foundation part is provided with a bottom surface, and the pick head sleeves the periphery of the pick tip, and comprises a central hole penetrating through the bottom and the top; the central hole is divided into upper and lower segments, and the upper segment is a counterbore; the lower segment is a threaded hole, and the counterbore is provided with a propping surface and a parallel surface; the propping surface fits the step surface, so that the cone part protrudes out of the top of the pick head, and the parallel surface and the bottom surface form a leveling surface; the pick shank is provided with a spiral part, a shank and a pushing part, and the spiral part is provided with a top and is tightly connected with the threaded hole. By the combination of the structure, the technical problem of the low-cobalt extra coarse grain cemented carbide cutting pick is solved, and the good effects of improving toughness and hardness of the alloy cutting pick, reducing manufacturing cost and improving utilization rate are achieved.
Description
Technical field
The invention provides a kind of alloy pick being suitable for excavator, espespecially a kind of low cobalt surpasses coarse-grain carbide alloy pick and manufacture method thereof.
Background technology
There is to meet excavator pick the requirement of anticorrosive, high rigidity and high tenacity, pick generally adopt WC carbide alloy (comprising tungsten powder, cobalt powder) material and through moulding form, punching press, grinding and and the mode of WEDM electric discharge processing shaping.But coarse grain WC has the series of advantages such as microstructural flaws is few, crystallite dimension is large, micro-hardness is high, microstrain is little, by itself and cobalt content are suitably adjusted, toughness and hardness can be obtained and mate good low cobalt and surpass coarse-grain carbide alloy.But the assembly processing of Hardmetal materials should be accomplished:
1. uniformity.The crystal structure of uniformity, minimum impurity and the highest cleanliness factor be Hardmetal materials shaping after there is mark that is durable, abrasion resistance.
2. avoid porous.Porous is the raw-material purity of checking and the whether meticulous standard of production technology.Porous degree is higher, and wear intensity is higher with the danger fractureed.
3. improve hardness.The mixing of raw material powder and the size of crystal grain determine the hardness of sintering instrument.When hardness and processing tasks well matched, wear intensity is then less.
4. reduce breaking strength.Easy fracture, illustrates carbide alloy poor quality.
5. resistance to wear.Carbide alloy, except having high wear resistance, also should have enough rigidity.
On this basis, the present inventor, through research, experiment, provides a kind of low cobalt with anticorrosive, high rigidity and high tenacity and surpasses coarse-grain carbide alloy pick and manufacture method thereof.
Summary of the invention
For solving the problems of the technologies described above, main purpose of the present invention is to provide a kind of low cobalt with anticorrosive, high rigidity and high tenacity to surpass coarse-grain carbide alloy pick and manufacture method thereof.
For reaching above-mentioned purpose, the technical scheme of the present invention's application is: a kind of low cobalt surpasses coarse-grain carbide alloy pick, comprise tooth tip portion, tooth head and tooth shank, wherein: described tooth tip portion is boss-shaped, the Talide of high rigidity is adopted to make, and comprise trunk portion that basic courses department upwards extends and be provided with cone portion on trunk portion top, this basic courses department and trunk portion are formed with class face and have bottom surface, described tooth head is frustum, be placed on described tooth tip portion peripheral, it adopts high tenacity, the hard alloy in low cobalt of wear resistence is made, and comprise the ring part had with centre bore and its underpart at top bottom this tooth head, described centre bore is divided into two sections, epimere is the counter sink of accommodating described tooth tip portion, hypomere is the screwed hole be connected with this tooth shank, this counter sink have supporting surface and relatively this supporting surface form scalariform parallel surface, fit in this supporting surface and described class face, described cone portion is protruded at this tooth head top, this parallel surface now then forms burnishing surface with described bottom surface, described tooth shank has spire, shank and the withstanding part between this shank and spire, and this spire has top and tightens with described screwed hole and is connected.
Preferred in embodiments of the present invention, described low cobalt surpasses coarse-grain carbide alloy pick and comprises layer further, and this layer will weld described bottom surface and to weld with described top by concentrating pricker liquid on and formed.
Preferred in embodiments of the present invention, described basic courses department and trunk portion are cylindric, and the diameter of its basic portion is greater than the diameter of this trunk portion, and are in same axis between both and manifest in superposition situation, and are formed with class face by this.
Preferred in embodiments of the present invention, described cone portion is located at described trunk portion end face, and the girth at its cone portion cone end is equal to or less than the girth of trunk portion end face, is also provided with depressed part on this cone portion surface.
Preferred in embodiments of the present invention, the peripheral inwardly indentation of described ring part has cannelure.
Preferred in embodiments of the present invention, described withstanding part is the shape of falling control tower and has the face of holding, and when described spire and described screwed hole are tightened, this holds face and pushes against bottom described tooth head.
For reaching above-mentioned purpose, the technical scheme of the present invention's application is: a kind of low cobalt surpasses the manufacture method of coarse-grain carbide alloy pick, wherein: this manufacture method comprises: first, carries out mixing assembly to raw material needed for tooth tip portion, tooth head and each assembly of tooth shank; Secondly, adopt liquid forging forming method shaping respectively; Again, with liquid forging technology, by concentrate on pricker liquid formed layer and by tooth tip portion and tooth shank closely integrally welded; Finally, tightened by screwed hole and spire, make tooth tip portion, tooth head and this three of tooth shank become to be integrated.
Preferred in embodiments of the present invention, the material composition of described tooth head and batch mixing process 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 appropriate agglutinant mixing, add alcohol wet-milling again, obtain mixed material; Again described mixed material is put into drying box, under the condition of 85-100 DEG C, dry 25-40 hour.
Preferred in embodiments of the present invention, the method for forming of described tooth head be first shape, binder removal again, then sinter, wherein:
Sizing: utilize mixed material, bond quality concentration be 5% buna gasoline solution add using the proportioning of 100-200ml/kg as bonding agent in dried mixed material, granulation under the condition of 28-32Mpa and pressurize 15s, screening, mold pressing preformed under the condition of 39-42Mpa and pressurize 15s, compressing by isostatic cool pressing under 200MPa, obtain green compact;
Binder removal: after being dried by green compact, do binder removal process in the vacuum drying oven of 500-600 DEG C;
Green compact after binder removal are cooled with stove after 1-2 hour 135-1400 DEG C of insulation by sintering: under the vacuum condition of 100-200Pa.
Preferred in embodiments of the present invention, described layer thickness is 2-3mm.
Compared with prior art, its useful effect: by adjusting alloy material cobalt content, not only promotes toughness and the hardness of alloy pick, and reduces manufacturing cost and improve service efficiency in the present invention.
Accompanying drawing explanation
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 of tooth head in Fig. 4.
Fig. 6 is the schematic diagram of the embodiment of the present invention by die manufacture.
Detailed description of the invention
Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail.The example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining technical scheme of the present invention, and not should be understood to limitation of the present invention.
In describing the invention, term " interior ", " outward ", " longitudinal direction ", " transverse direction ", " on ", D score, " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, be only the present invention for convenience of description instead of require that the present invention with specific azimuth configuration and operation, therefore must not should be understood to limitation of the present invention.
Referring to Fig. 1 and combining consults shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, and the invention provides low cobalt and surpass coarse-grain carbide alloy pick and manufacture method thereof, this low cobalt surpasses coarse-grain carbide alloy pick and comprises tooth tip portion 10, tooth head 20 and tooth shank 30, wherein:
Described tooth tip portion 10, in boss-shaped, adopts the Talide of high rigidity to make, and comprises trunk portion 12 that basic courses department 11 upwards extends and be provided with cone portion 13 on trunk portion top.This basic courses department 11 is cylindric with trunk portion 12, and its basic portion 11 has bottom surface 111, and its diameter is greater than the diameter of this trunk portion 12, and is in same axis between both and manifests in superposition situation, is formed as class face 112 by this.Meanwhile, this cone portion 13 is located at described trunk portion 12 end face, and the girth at the bottom of the cone of its cone portion 13 is equal to or less than the girth of trunk portion 12 end face.Where applicable, in order to increase frictional force and be easy to point unload thin slag, is also provided with depressed part 131 on this cone portion 13 surface;
Described tooth head 20 is frustum, described tooth tip portion 10 can be placed on peripheral, it adopts high tenacity, the hard alloy in low cobalt of wear resistence is made, and comprise the ring part 22 had with centre bore 21 and its underpart at top bottom this tooth head 20, be formed with cannelure 221 in the inside indentation in the periphery of this ring part 22.In the present embodiment, described centre bore 21 is divided into two sections, epimere is the counter sink 211 of accommodating described tooth tip portion 10, hypomere is the screwed hole 212 that can be connected with tooth shank 30, this counter sink 211 have supporting surface 2112 and relatively this supporting surface 2112 form scalariform parallel surface 2111, during assembling, this supporting surface 2112 is fitted with described class face 112, described cone portion 13 is made to protrude at this tooth head 20 top, this parallel surface 2112 now is then formed as burnishing surface with the bottom surface 111 of described basic courses department 11, making to be assembled in described tooth head 20 in counter sink 211 with this can not prolapse upwards,
Described tooth shank 30 has spire 31 tightening with described screwed hole 212 by this and is connected, and now described tooth tip portion 10 is also connected with this tooth shank 30 melting welding by layer 40.In the present embodiment, this tooth shank 30 also comprises shank 32 and the withstanding part 33 between this shank 32 and spire 31 thereof, described withstanding part 33 is the shape of falling control tower and has the face of holding 331, when this spire 31 is tightened with described screwed hole 212, this holds face 331 and pushes against bottom described tooth head 20, in order to support that this tooth head 20 is downward or stressed forward, also make described tooth head 20 can not deviate from counter sink 211 downwards simultaneously.In the present embodiment, described layer 40 is welded in described bottom surface 111 to be formed with described spire 31 free top end 313, can effectively described tooth tip portion 10 be fixed as one with tooth shank 30 by this.In the present embodiment, described shank 32 comprises latch part 321, this latch part 321, for coordinating and other (comprising excavator, rig and coal-winning machine) relevant devices and the structure that is, because of this structure not design focal point of the present invention, is not described in detail at this.
Incorporated by reference to consulting shown in Fig. 6, the invention provides low cobalt and surpass coarse-grain carbide alloy pick and manufacture method thereof, this low cobalt surpasses coarse-grain carbide alloy pick manufacture method and comprises: first, carries out mixing assembly to raw material needed for tooth tip portion 10, tooth head 20 and each assembly of tooth shank 30; Secondly, adopt liquid forging forming method shaping respectively; Again, shaping tooth tip portion 10 and tooth shank 30 are adopted the method for liquid forging (comprise concentrate pricker liquid on form layer 40), make both be closely as one (as Fig. 6); Finally, tightened with the spire 31 of tooth shank 30 by the screwed hole 212 of tooth head 20, make tooth tip portion 10, tooth head 20 and this three of tooth shank 30 become to be integrated, wherein:
The first step: mixing assembly is carried out to raw material needed for tooth tip portion 10, tooth head 20 and each assembly of tooth shank 30, wherein: the material component of described tooth tip portion 10, tooth shank 30 is prior art, therefore is not described in detail at this.But, for material assembly and the processing thereof of described tooth head 20, adopt and extra-coarse grainedly improve WC grain intensity, this is because WC grain is thicker, make defect in WC grain reduce and improve WC grain intensity.But, WC grain specific area is reduced, alloy cobalt layers is thickened, thus put forward heavy alloyed impact toughness, cobalt content in alloy reduces and the increase of WC content makes the abrasion resistance of alloy improve, and is also conducive to putting forward heavy alloyed thermal conductivity, falls low-alloyed coefficient of thermal expansion.When the grain size of WC reaches more than 5.0um, carbide alloy is while the intensity that maintenance is good, plasticity be improved significantly, product reliability improves greatly, therefore, low cobalt surpasses coarse-grain carbide alloy and has high thermal conductivity and the low coefficient of expansion simultaneously, good fracture toughness, harder intensity and resistance to elevated temperatures, in meeting, some special instructions for uses such as hard above coal seam and hard rock driving, facilitate the development of mining, excavating tools by this.To sum up and manufacturing and designing in conjunction with the embodiment of the present invention, tooth head 20 described in it is achieved according to this theory, such as, in the present invention, described tooth head 20, its material composition and batch mixing process 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 appropriate agglutinant mixing, then add alcohol wet-milling, obtain mixed material; Again described mixed material is put into drying box, under the condition of 85-100 DEG C, dry 25-40 hour.
Second step: adopt liquid forging forming method to make described tooth tip portion 10, tooth head 20 and tooth shank 30 shaping respectively, wherein: the forming method of described tooth tip portion 10, tooth shank 30 belongs to prior art, no longer explains at this.But, the method of forming of described tooth head 20 is: (1) utilizes the mixed material in the first step to shape, by mass concentration be 5% buna gasoline solution add using the proportioning of 100-200ml/kg as bonding agent in dried batch mixing, granulation under the condition of 28-32Mpa and pressurize 15s, screening, mold pressing preformed under the condition of 39-42Mpa and pressurize 15s, compressing by isostatic cool pressing under 200MPa, obtain green compact; (2) binder removal: after being dried by green compact, do binder removal process in the vacuum drying oven of 500-600 DEG C; (3) sinter: under the vacuum condition of 100-200Pa, cooled with stove after 1-2 hour 135-1400 DEG C of insulation by the green compact after binder removal, obtain hard alloy in low cobalt material, the described tooth head 20 that process is shaping by this, its experimental result is:
MC010-HRS-150 digital display Rockwell apparatus is utilized to record Rockwell hardness (HRC): 70-72;
JMTT HVC-10A1 micro Vickers is utilized to record Vickers hardness (HV):
A. loading environment 200g/15s 1252-1286;
B. loading environment 500g/15s 1053-1148.
INSTRON1195 type (8800 control system) electronic universal tester is utilized to record the loading velocity 1mm/min2180-2430MPa of three-point bending resistance intensity.
3rd step: shaping tooth tip portion 10 and tooth shank 30 are adopted liquid forging (referring to shown in Fig. 6) and to concentrate the method that pricker liquid forms layer 40 on, both is closely as one, its concrete process is: tooth tip portion 10 is embedded mould 50 upward with its bottom surface 111 and is heated to 200-350 DEG C, concentrating fusing point again on is after 800-900 DEG C of pricker liquid, by the tooth shank 30(being heated to 150-300 DEG C as spire 31 downwards and aim at tooth tip portion bottom surface 111), vertically die cavity is pressed into by relevant device (not shown), tooth tip portion 10 and tooth shank 30 are welded as a whole, the thickness of the pricker layer 40 that welding is formed is 2-3mm.
4th step: tightened with the spire 31 of tooth shank 30 by the screwed hole 212 of tooth head 20, makes tooth tip portion 10, tooth head 20 and this three of tooth shank 30 become to be integrated.
5th step: quenching and tempering process.Shaping low cobalt is surpassed coarse-grain carbide alloy pick to reheat and make Quenching Treatment, quenching is heated to temperature in latter 8 hours and carries out temper, improves the wear resistence of pick by this.Described quenching, temperature are that the material used according to pick is determined, are generally the processing method that prior art is identical, do not remake be described in detail at this.
Claims (10)
1. a low cobalt surpasses coarse-grain carbide alloy pick, comprise tooth tip portion, tooth head and tooth shank, it is characterized in that: described tooth tip portion is boss-shaped, the Talide of high rigidity is adopted to make, and comprise trunk portion that basic courses department upwards extends and be provided with cone portion on trunk portion top, this basic courses department and trunk portion are formed with class face and have bottom surface, described tooth head is frustum, be placed on described tooth tip portion peripheral, it adopts high tenacity, the hard alloy in low cobalt of wear resistence is made, and comprise the ring part had with centre bore and its underpart at top bottom this tooth head, described centre bore is divided into two sections, epimere is the counter sink of accommodating described tooth tip portion, hypomere is the screwed hole be connected with this tooth shank, this counter sink have supporting surface and relatively this supporting surface form scalariform parallel surface, fit in this supporting surface and described class face, described cone portion is protruded at this tooth head top, this parallel surface now then forms burnishing surface with described bottom surface, described tooth shank has spire, shank and the withstanding part between this shank and spire, and this spire has top and tightens with described screwed hole and is connected.
2. low cobalt as claimed in claim 1 surpasses coarse-grain carbide alloy pick, it is characterized in that: described low cobalt surpasses coarse-grain carbide alloy pick and comprises layer further, and this layer will weld described bottom surface and to weld with described top by concentrating pricker liquid on and formed.
3. low cobalt as claimed in claim 2 surpasses coarse-grain carbide alloy pick, it is characterized in that: described basic courses department and trunk portion are cylindric, the diameter of its basic portion is greater than the diameter of this trunk portion, and is in same axis between both and manifests in superposition situation, and is formed with class face by this.
4. low cobalt as claimed in claim 3 surpasses coarse-grain carbide alloy pick, it is characterized in that: described cone portion is located at described trunk portion end face, and the girth at its cone portion cone end is equal to or less than the girth of trunk portion end face, is also provided with depressed part on this cone portion surface.
5. low cobalt as claimed in claim 4 surpasses coarse-grain carbide alloy pick, it is characterized in that: the peripheral inwardly indentation of described ring part has cannelure.
6. low cobalt as claimed in claim 5 surpasses coarse-grain carbide alloy pick, it is characterized in that: described withstanding part is the shape of falling control tower and has the face of holding, and when described spire and described screwed hole are tightened, this holds face and pushes against bottom described tooth head.
7. be practically applicable to the manufacture method that low cobalt as claimed in claim 6 surpasses coarse-grain carbide alloy pick, it is characterized in that: this manufacture method comprises: first, mixing assembly is carried out to raw material needed for tooth tip portion, tooth head and each assembly of tooth shank; Secondly, adopt liquid forging forming method shaping respectively; Again, with liquid forging technology, by concentrate on pricker liquid formed layer and by tooth tip portion and tooth shank closely integrally welded; Finally, tightened by screwed hole and spire, make tooth tip portion, tooth head and this three of tooth shank become to be integrated.
8. low cobalt as claimed in claim 7 surpasses the manufacture method of coarse-grain carbide alloy pick, it is characterized in that: the material composition of described tooth head and batch mixing process 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 appropriate agglutinant mixing, add alcohol wet-milling again, obtain mixed material; Again described mixed material is put into drying box, under the condition of 85-100 DEG C, dry 25-40 hour.
9. low cobalt as claimed in claim 8 surpasses the manufacture method of coarse-grain carbide alloy pick, it is characterized in that: the method for forming of described tooth head be first shape, binder removal again, then sinter, wherein:
Sizing: utilize mixed material, bond quality concentration be 5% buna gasoline solution add using the proportioning of 100-200ml/kg as bonding agent in dried mixed material, granulation under the condition of 28-32Mpa and pressurize 15s, screening, mold pressing preformed under the condition of 39-42Mpa and pressurize 15s, compressing by isostatic cool pressing under 200MPa, obtain green compact;
Binder removal: after being dried by green compact, do binder removal process in the vacuum drying oven of 500-600 DEG C;
Green compact after binder removal are cooled with stove after 1-2 hour 135-1400 DEG C of insulation by sintering: under the vacuum condition of 100-200Pa.
10. low cobalt as claimed in claim 8 surpasses the manufacture method of coarse-grain carbide alloy pick, it is characterized in that: described layer thickness is 2-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410732635.0A CN104500063B (en) | 2014-12-07 | 2014-12-07 | A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410732635.0A CN104500063B (en) | 2014-12-07 | 2014-12-07 | A kind of super coarse-grain hard alloy pick of low cobalt and its manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107060754A (en) * | 2017-04-11 | 2017-08-18 | 中车株洲电力机车有限公司 | Bore pick and its cutterhead in one kind top |
| WO2018064901A1 (en) * | 2016-10-09 | 2018-04-12 | 杨岗 | New cutting pick |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018064901A1 (en) * | 2016-10-09 | 2018-04-12 | 杨岗 | New cutting pick |
| CN107060754A (en) * | 2017-04-11 | 2017-08-18 | 中车株洲电力机车有限公司 | Bore pick and its cutterhead in one kind top |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104500063B (en) | 2017-07-14 |
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Denomination of invention: A low cobalt ultra coarse grain hard alloy cutting tooth and its manufacturing method Granted publication date: 20170714 Pledgee: Jiangxi Chongyi Rural Commercial Bank Co.,Ltd. Pledgor: JIANGXI YAOSHENG TUNGSTEN Co.,Ltd. Registration number: Y2024980025114 |