CN110614362B - Manufacturing method of powder metallurgy composite screw tap - Google Patents
Manufacturing method of powder metallurgy composite screw tap Download PDFInfo
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- CN110614362B CN110614362B CN201911044689.7A CN201911044689A CN110614362B CN 110614362 B CN110614362 B CN 110614362B CN 201911044689 A CN201911044689 A CN 201911044689A CN 110614362 B CN110614362 B CN 110614362B
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- 239000002131 composite material Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 89
- 238000005245 sintering Methods 0.000 claims abstract description 32
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000007654 immersion Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 7
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 17
- 239000003921 oil Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 239000011159 matrix material Substances 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 229910003470 tongbaite Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910000476 molybdenum oxide Inorganic materials 0.000 claims description 3
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- 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
- C22C29/067—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 comprising a particular metallic binder
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- 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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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F2003/241—Chemical after-treatment on the surface
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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Abstract
The invention relates to a manufacturing method of a powder metallurgy composite screw tap. The method comprises the following steps: proportioning raw materials of a substrate, and step two: cutting layer raw material proportioning, and step three: pressing the substrate, and the fourth step: sintering the base body green body, and step five: pressing a cutting layer, and a sixth step: sintering the composite tap green body, and performing the seventh step: primary oil immersion, step eight: milling teeth, and the ninth step: external inspection, step ten: heat treatment, step eleven: blackening, step twelve: and (5) secondary oil immersion and packaging. The method is scientific and precise, the substrate and the cutting layer are processed separately, raw materials are saved, artificial chip guide grooves are avoided, the process is reduced, the cost is reduced, meanwhile, the cutting layer and the drill tip of the cutting work are made of high-hardness materials, the substrate is made of traditional materials, the reliable cutting of the stepped drill is guaranteed, and the stepped drill has high toughness and strength.
Description
Technical Field
The invention relates to the technical field of composite screw taps, in particular to a manufacturing method of a powder metallurgy composite screw tap.
Background
The patent that discloses a compound screw tap in current chinese patent database, this patent application number is 201711446482.3, and application date is 2017.12.27, and application publication number is CN108098083A, and application publication number is 2018.06.01, and the device includes the screw tap body the tip of screw tap body still is provided with the guide drilling cutting edge, and the bottom hole before the tapping passes through the screw tap body be in the in-process of tapping is bored simultaneously under the cooperation of guide drilling cutting edge. The disadvantages are that: the composite screw tap is processed by the traditional processing method, the traditional composite screw tap has high integral hardness and is easy to break, the processing is very careful, the rejection rate is high, and the drill point is easy to wear during high-speed drilling.
Disclosure of Invention
The invention aims to provide a manufacturing method of a powder metallurgy composite tap, aiming at the defects of the prior art that the drill tip is easy to wear or burn when drilling at high speed.
In order to achieve the purpose, the invention discloses a manufacturing method of a powder metallurgy composite tap, which adopts the following technical scheme:
a method for manufacturing a powder metallurgical composite tap, comprising the steps of:
the method comprises the following steps: the matrix raw material proportion is that 100 plus 150 weight portions of iron powder, 0.5-1 weight portion of cobalt powder, 1-2 weight portions of nickel powder, 0.5-1 weight portion of silicon dioxide particles, 0.8-1.5 weight portions of chromium carbide powder and 0.5-0.8 weight portion of molybdenum oxide powder are added into a stirring mill for grinding until the average grain diameter of the mixture is less than 20um, the grinding is stopped to obtain matrix grinding material, and the matrix grinding material is put into a sprayer for spraying and drying to obtain matrix mixture for standby;
step two: proportioning raw materials of a cutting layer, namely adding 40-60 parts by weight of tungsten carbide powder, 20-30 parts by weight of cobalt powder, 1-2 parts by weight of nickel powder and 10-15 parts by weight of chromium carbide powder into a sand mill for grinding until the average particle size of the mixture is less than 1.5 mu m, stopping grinding to obtain a cutting layer abrasive, putting the cutting layer abrasive into a sprayer for spraying and drying to obtain a cutting layer mixture for later use;
Step three: the base body pressing step, the cutting layer mixture in the step two is filled into the bottom of a cylinder cavity of a base body lower die in a base body forming die, then the base body mixture in the step one is filled into the base body forming die, a base body green body is pressed through the base body forming die and reserved for standby use, the base body green body comprises a middle cylinder, a drilling cutting cylinder coaxial with the middle cylinder is arranged on the lower end face of the middle cylinder, the cross section of the drilling cutting cylinder is the same as that of the middle cylinder, a drill handle cylinder coaxial with the middle cylinder is arranged on the upper end face of the middle cylinder, the base body forming die comprises a base body lower die and a base body upper die, a columnar material containing cavity is formed in the upper end face of the base body lower die, a columnar through hole is formed in the lower end face of the base body upper die above the columnar material containing cavity, the columnar through hole and the columnar material containing cavity are coaxially arranged, the column cavity is of a lower layer structure of the columnar material containing cavity, and the columnar material containing cavity is used for processing the drilling cutting cylinder and the middle cylinder, the cylindrical through hole is used for processing a drill shank cylinder;
step four: sintering the substrate green body, namely placing the substrate green body in the third step on a carbon plate and conveying the substrate green body into a sintering furnace, sintering the substrate green body in the sintering furnace for 4.5-6 hours at the temperature of 1100-1300 ℃, sintering the substrate green body into a substrate core, and naturally cooling the substrate core for later use;
Step five: pressing a cutting layer, namely placing a base body core in a cutting layer forming die in the fourth step, forming a filler clearance cavity between the base body core and the cutting layer forming die, filling a cutting layer mixture in the second step into the filler clearance cavity, pressing a composite screw tap green body through the cutting layer forming die, reserving the composite screw tap green body for standby use, wherein the composite screw tap green body comprises a base body green body and a tubular cutting layer attached to the outer surface of a middle column body of the base body green body, the tubular cutting layer comprises a thin tube body used for processing a twist drill cutting edge and a thick tube body used for processing a screw tap taper tooth, the thin tube body and the thick tube body are coaxially arranged, the cutting layer forming die comprises a cutting lower die and a cutting upper die, a columnar chip storage cavity is formed in the upper end surface of the cutting lower die, the chip storage cavity comprises a positioning hole inserted with a lower end of a drill chip column body and a cylindrical cavity filled with the positioning hole, and an outer convex strip-shaped spiral bulge is arranged on the inner wall of the cylindrical cavity, cylinder surface is contradicted on strip spiral arch in the middle of the base member unburned bricks, forms the filler clearance chamber between base member core, strip spiral arch and the storage bits chamber, and the cylindricality chamber is including the thin column hole that is used for processing the fluted drill cutting layer and being used for processing the thick column hole of screw tap cutting layer, and locating hole cross section radius R, thin column hole cross section radius R and thick column hole cross section radius L's relation do: r is more than or equal to 1.1R and less than or equal to 1.3R, L is more than or equal to 1.1R and less than or equal to 1.3R, and a limiting hole for inserting a drill shank cylinder is formed in the upper cutting die;
Step six: sintering the composite tap green body, namely placing the composite tap green body in the step five on a carbon plate, conveying the composite tap green body into a vacuum sintering furnace, wherein the vacuum environment is 0.6MPa, the composite tap green body is sintered in the sintering furnace for 4.5-6 h, the temperature of the sintering furnace is 1440-1480 ℃, sintering the composite tap green body into a composite tap blank, and naturally cooling the composite tap blank for later use;
step seven: performing primary oil immersion, namely performing oil immersion on the sintered and cooled composite screw tap blank, removing iron chips and burrs on the surface of the composite screw tap blank, and separating the composite screw tap blank from air to be reserved for later use;
step eight: milling teeth, namely clamping the composite screw tap blank in the step seven on a numerical control milling machine, machining the surfaces of the drilling cutting cylinder and the thin tube body according to preset data to obtain a twist drill, machining the surface of the thick tube body to obtain screw tap teeth, and thus obtaining a semi-finished composite screw tap;
step nine: performing external inspection, namely performing geometric precision inspection on the semi-finished composite screw tap processed in the step eight, if the semi-finished composite screw tap is qualified in precision, executing the step ten, and if not, scrapping the semi-finished composite screw tap;
step ten: heat treatment, namely placing the semi-finished product composite screw tap qualified by inspection on a heat treatment mesh belt, heating the semi-finished product composite screw tap by a heat treatment furnace at the heat treatment temperature of 900 ℃ for 1-3 hours, and then quenching and tempering the semi-finished product composite screw tap in an oil tank;
Step eleven: cleaning the semi-finished composite screw tap in the step ten, then exposing the semi-finished composite screw tap in a plasma torch, injecting 80% by weight of oxygen and 20% by weight of carbon tetrafluoride into the plasma torch, inducing gas into a plasma state by a discharge device in the plasma torch, wherein the temperature in the plasma torch is 800 ℃, and sending the semi-finished composite screw tap into the plasma torch for 5-8 hours, so that a metal oxide layer is generated on the surface of the semi-finished composite screw tap to obtain a finished composite screw tap;
step twelve: and (5) secondary oil immersion and packaging, namely cleaning the finished product of the composite screw tap, immersing in oil and packaging.
Compared with the prior art, the invention has the beneficial effects that: the method is scientific and rigorous, the substrate and the cutting layer are processed separately, raw materials are saved, artificial chip guide grooves are avoided, the process is reduced, the cost is reduced, meanwhile, the cutting layer and the drill point of the cutting work are made of high-hardness materials, the substrate is made of traditional materials, reliable cutting of the stepped drill is guaranteed, and the stepped drill has high toughness and strength.
Drawings
Fig. 1 is a schematic structural diagram of a substrate green body and a substrate forming mold.
Fig. 2 is a schematic structural view of a composite tap green body and a cutting layer forming die.
Fig. 3 is a schematic view of the structure of the finished composite tap.
The composite tap comprises a base body forming die 1, a base body lower die 101, a cylinder cavity 102, a columnar material containing cavity 103, a base body upper die 104, a cylindrical through hole 105, a base body green body 2, a middle cylinder 201, a drilling cutting cylinder 202, a drilling handle cylinder 203, a filler gap cavity 3, a composite tap green body 4, a tubular cutting layer 401, a thin tube 402, a thick tube 403, a cutting layer forming die 5, a cutting lower die 501, a cutting upper die 502, a chip storage cavity 503, a positioning hole 504, a cylindrical cavity 505, a strip-shaped spiral protrusion 506, a thin tube 507, a thick tube 508, a spacing hole 509, a composite tap 6, a twist drill 601 and a tap tooth 602.
Detailed Description
As shown in fig. 1 to 3, a method for manufacturing a powder metallurgical composite tap includes the steps of:
the method comprises the following steps: the matrix raw material proportion is that 100 plus 150 weight portions of iron powder, 0.5-1 weight portion of cobalt powder, 1-2 weight portions of nickel powder, 0.5-1 weight portion of silicon dioxide particles, 0.8-1.5 weight portions of chromium carbide powder and 0.5-0.8 weight portion of molybdenum oxide powder are added into a stirring mill for grinding until the average grain diameter of the mixture is less than 20um, the grinding is stopped to obtain matrix grinding material, and the matrix grinding material is put into a sprayer for spraying and drying to obtain matrix mixture for standby;
Step two: proportioning raw materials of a cutting layer, namely adding 40-60 parts by weight of tungsten carbide powder, 20-30 parts by weight of cobalt powder, 1-2 parts by weight of nickel powder and 10-15 parts by weight of chromium carbide powder into a sand mill for grinding until the average particle size of the mixture is less than 1.5 mu m, stopping grinding to obtain a cutting layer abrasive, putting the cutting layer abrasive into a sprayer for spraying and drying to obtain a cutting layer mixture for later use;
step three: base pressing, namely filling the cutting layer mixture in the step two into the bottom of a cylinder cavity 102 of a base lower die 101 in a base forming die 1, filling the base mixture in the step one into the base forming die 1, pressing a base green body 2 through the base forming die 1 for standby, wherein the base green body 2 comprises a middle cylinder 201, the lower end surface of the middle cylinder 201 is provided with a drilling cutting cylinder 202 coaxial with the middle cylinder 201, the cross section of the drilling cutting cylinder 202 is the same as that of the middle cylinder 201, the upper end surface of the middle cylinder 201 is provided with a drill handle cylinder 203 coaxial with the middle cylinder 201, the base forming die 1 comprises a base lower die 101 and a base upper die 104, the upper end surface of the base lower die 101 is provided with a columnar material containing cavity 103, the lower end surface of the base upper die 104 above the columnar material containing cavity 103 is provided with a columnar through hole 105, and the columnar through hole 105 is coaxial with the columnar material containing cavity 103, the column cavity 102 is a lower layer structure of the columnar material containing cavity 103, the columnar material containing cavity 103 is used for processing the drill cutting column 202 and the middle column 201, and the columnar through hole 105 is used for processing the drill handle column 203;
Step four: sintering the substrate green body, namely placing the substrate green body 2 in the third step on a carbon plate and conveying the substrate green body into a sintering furnace, sintering the substrate green body 2 in the sintering furnace for 4.5-6 h at the temperature of 1100-1300 ℃, sintering the substrate green body 2 into a substrate core, and naturally cooling the substrate core for later use;
step five: cutting layer pressing, wherein a base core in the fourth step is placed in a cutting layer forming die 5, a filler clearance cavity 3 is formed between the base core and the cutting layer forming die 5, then a cutting layer mixture in the second step is filled in the filler clearance cavity 3, a composite tap green compact 4 is pressed through the cutting layer forming die 5 and is reserved for standby application, the composite tap green compact 4 comprises a base green compact 2 and a tubular cutting layer 401 attached to the outer surface of a middle cylinder 201 of the base green compact 2, the tubular cutting layer 401 comprises a thin tube 402 used for machining a twist drill bit 601 and a thick tube 403 used for machining a tap taper tooth 602, the thin tube 402 and the thick tube 403 are coaxially arranged, the cutting layer forming die 5 comprises a cutting lower die 501 and a cutting upper die 502, a columnar chip storage cavity 503 is formed in the upper end face of the cutting lower die 501, the chip storage cavity 503 comprises a positioning hole 504 inserted with the lower end head of the drill chip cylinder 202 and a columnar cavity 505 filled with powder, the inner wall of the cylindrical cavity 505 is provided with a convex strip spiral protrusion 506, the outer surface of the middle cylinder 201 of the matrix green compact 2 is abutted against the strip spiral protrusion 506, a packing clearance cavity 3 is formed among the matrix core, the strip spiral protrusion 506 and the chip storage cavity 503, the cylindrical cavity 505 comprises a thin cylinder hole 507 for processing a cutting layer of the twist drill 601 and a thick cylinder hole 508 for processing a cutting layer of a screw tap, and the relation among the cross section radius R of the positioning hole 504, the cross section radius R of the thin cylinder hole 507 and the cross section radius L of the thick cylinder hole 508 is as follows: r is more than or equal to 1.1R and less than or equal to 1.3R, L is more than or equal to 1.1R and less than or equal to 1.3R, and a limiting hole 509 inserted with the drill shank column 203 is formed in the upper cutting die 502;
Step six: sintering the composite tap green body, namely placing the composite tap green body 4 in the fifth step on a carbon plate, conveying the composite tap green body into a vacuum sintering furnace, sintering the composite tap green body in the sintering furnace for 4.5-6 h under the atmospheric pressure of 0.6MPa, and sintering the composite tap green body into a composite tap blank at the temperature of 1440-1480 ℃, and naturally cooling the composite tap green body for later use;
step seven: primary oil immersion, namely immersing the sintered and cooled composite screw tap blank in oil, removing iron chips and burrs on the surface of the composite screw tap blank, and separating the composite screw tap blank from air for later use;
step eight: milling teeth, namely clamping the composite tap blank obtained in the step seven on a numerical control milling machine, machining the surfaces of the drilling cutting cylinder 202 and the thin tube body 402 according to preset data to obtain a twist drill 601, machining the surface of the thick tube body 403 to obtain a tap tapered tooth 602, and obtaining a semi-finished composite tap;
step nine: performing external inspection, namely performing geometric precision inspection on the semi-finished composite screw tap processed in the step eight, if the semi-finished composite screw tap is qualified in precision, executing the step ten, and if not, scrapping the semi-finished composite screw tap;
step ten: heat treatment, namely placing the semi-finished product composite screw tap qualified by inspection on a heat treatment mesh belt, heating the semi-finished product composite screw tap by a heat treatment furnace at the heat treatment temperature of 900 ℃ for 1-3 hours, and then quenching and tempering the semi-finished product composite screw tap in an oil tank;
Step eleven: blackening, namely cleaning the semi-finished composite screw tap in the step ten, exposing the semi-finished composite screw tap in a plasma torch, injecting 80 wt% of oxygen and 20 wt% of carbon tetrafluoride into the plasma torch, inducing gas into a plasma state by a discharge device in the plasma torch, wherein the temperature in the plasma torch is 800 ℃, sending the semi-finished composite screw tap into the plasma torch for 5-8 hours, and generating a metal oxide layer on the surface of the semi-finished composite screw tap to obtain a finished composite screw tap 6;
step twelve: and (5) secondary oil immersion and packaging, namely cleaning and oil immersion of the finished composite screw tap 6 and packaging.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (1)
1. A manufacturing method of a powder metallurgy composite tap is characterized by comprising the following steps:
the method comprises the following steps: the matrix raw material proportion is that 100 plus 150 weight portions of iron powder, 0.5-1 weight portion of cobalt powder, 1-2 weight portions of nickel powder, 0.5-1 weight portion of silicon dioxide particles, 0.8-1.5 weight portions of chromium carbide powder and 0.5-0.8 weight portion of molybdenum oxide powder are added into a stirring mill for grinding until the average grain diameter of the mixture is less than 20um, the grinding is stopped to obtain matrix grinding material, and the matrix grinding material is put into a sprayer for spraying and drying to obtain matrix mixture for standby;
Step two: proportioning raw materials of a cutting layer, namely adding 40-60 parts by weight of tungsten carbide powder, 20-30 parts by weight of cobalt powder, 1-2 parts by weight of nickel powder and 10-15 parts by weight of chromium carbide powder into a sand mill for grinding until the average particle size of the mixture is less than 1.5 mu m, obtaining a cutting layer grinding material, putting the cutting layer grinding material into an atomizer for spraying and drying to obtain a cutting layer mixture for later use;
step three: the base body pressing step, the cutting layer mixture in the step two is filled into the bottom of a cylinder cavity of a base body lower die in a base body forming die, then the base body mixture in the step one is filled into the base body forming die, a base body green body is pressed through the base body forming die and reserved for standby use, the base body green body comprises a middle cylinder, a drilling cutting cylinder coaxial with the middle cylinder is arranged on the lower end face of the middle cylinder, the cross section of the drilling cutting cylinder is the same as that of the middle cylinder, a drill handle cylinder coaxial with the middle cylinder is arranged on the upper end face of the middle cylinder, the base body forming die comprises a base body lower die and a base body upper die, a columnar material containing cavity is formed in the upper end face of the base body lower die, a columnar through hole is formed in the lower end face of the base body upper die above the columnar material containing cavity, the columnar through hole and the columnar material containing cavity are coaxially arranged, the column cavity is of a lower layer structure of the columnar material containing cavity, and the columnar material containing cavity is used for processing the drilling cutting cylinder and the middle cylinder, the cylindrical through hole is used for processing a drill shank cylinder;
Step four: sintering the substrate green compact, namely placing the substrate green compact in the third step on a carbon plate and conveying the substrate green compact into a sintering furnace, sintering the substrate green compact in the sintering furnace for 4.5-6 h at the temperature of 1100-1300 ℃, sintering the substrate green compact into a substrate core, and naturally cooling the substrate core for later use;
step five: pressing a cutting layer, namely placing a base body core in a cutting layer forming die in the fourth step, forming a filler clearance cavity between the base body core and the cutting layer forming die, filling a cutting layer mixture in the second step into the filler clearance cavity, pressing a composite screw tap green body through the cutting layer forming die, reserving the composite screw tap green body for standby use, wherein the composite screw tap green body comprises a base body green body and a tubular cutting layer attached to the outer surface of a middle column body of the base body green body, the tubular cutting layer comprises a thin tube body used for processing a twist drill cutting edge and a thick tube body used for processing a screw tap taper tooth, the thin tube body and the thick tube body are coaxially arranged, the cutting layer forming die comprises a cutting lower die and a cutting upper die, a columnar chip storage cavity is formed in the upper end surface of the cutting lower die, the chip storage cavity comprises a positioning hole inserted with a lower end of a drill chip column body and a cylindrical cavity filled with the positioning hole, and an outer convex strip-shaped spiral bulge is arranged on the inner wall of the cylindrical cavity, cylinder surface is contradicted on strip spiral protrusion in the middle of the base member unburned bricks, forms the packing clearance chamber between base member core, strip spiral protrusion and the storage bits chamber, and the cylindricality chamber is including being used for processing the thin post hole on fluted drill cutting layer and being used for processing the thick post hole on screw tap cutting layer, and locating hole cross section radius R, thin post hole cross section radius R and thick post hole cross section radius L's relation is: r is more than or equal to 1.1R and less than or equal to 1.3R, L is more than or equal to 1.1R and less than or equal to 1.3R, and a limiting hole for inserting a drill shank cylinder is formed in the upper cutting die;
Step six: sintering the composite tap green body, namely placing the composite tap green body in the step five on a carbon plate, conveying the composite tap green body into a vacuum sintering furnace, wherein the vacuum environment is 0.6MPa, the composite tap green body is sintered in the sintering furnace for 4.5-6 h, the temperature of the sintering furnace is 1440-1480 ℃, sintering the composite tap green body into a composite tap blank, and naturally cooling the composite tap blank for later use;
step seven: performing primary oil immersion, namely performing oil immersion on the sintered and cooled composite screw tap blank, removing iron chips and burrs on the surface of the composite screw tap blank, and separating the composite screw tap blank from air to be reserved for later use;
step eight: milling teeth, namely clamping the composite screw tap blank in the step seven on a numerical control milling machine, machining the surfaces of the drilling cutting cylinder and the thin tube body according to preset data to obtain a twist drill, machining the surface of the thick tube body to obtain screw tap teeth, and thus obtaining a semi-finished composite screw tap;
step nine: performing external inspection, namely performing geometric precision inspection on the semi-finished composite screw tap processed in the step eight, if the semi-finished composite screw tap is qualified in precision, executing the step ten, and if not, scrapping the semi-finished composite screw tap;
step ten: heat treatment, namely placing the semi-finished product composite screw tap qualified by inspection on a heat treatment mesh belt, heating the semi-finished product composite screw tap by a heat treatment furnace at the heat treatment temperature of 900 ℃ for 1-3 hours, and then quenching and tempering the semi-finished product composite screw tap in an oil tank;
Step eleven: cleaning the semi-finished composite screw tap in the step ten, then exposing the semi-finished composite screw tap in a plasma torch, injecting 80% by weight of oxygen and 20% by weight of carbon tetrafluoride into the plasma torch, inducing gas into a plasma state by a discharge device in the plasma torch, wherein the temperature in the plasma torch is 800 ℃, and sending the semi-finished composite screw tap into the plasma torch for 5-8 hours, so that a metal oxide layer is generated on the surface of the semi-finished composite screw tap to obtain a finished composite screw tap;
step twelve: and (5) secondary oil immersion and packaging, namely cleaning the finished product of the composite screw tap, immersing in oil and packaging.
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| CN201911044689.7A CN110614362B (en) | 2019-10-30 | 2019-10-30 | Manufacturing method of powder metallurgy composite screw tap |
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| DE19511829B4 (en) * | 1995-03-30 | 2005-12-15 | Jörg Dr. Gühring | cutting tool |
| US7776256B2 (en) * | 2005-11-10 | 2010-08-17 | Baker Huges Incorporated | Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies |
| CN101537559B (en) * | 2009-03-31 | 2011-05-11 | 河北富世华冀凯金刚石工具有限公司 | Manufacturing method for diamond tool |
| US8272816B2 (en) * | 2009-05-12 | 2012-09-25 | TDY Industries, LLC | Composite cemented carbide rotary cutting tools and rotary cutting tool blanks |
| CN105177389B (en) * | 2015-08-24 | 2017-06-06 | 安徽理工大学 | A kind of mine hard alloy hard alloy composite ball tooth and preparation method thereof |
| CN106272989A (en) * | 2016-08-16 | 2017-01-04 | 河南涵信新材料科技有限公司 | A kind of diamond segment and preparation method thereof, diamond segment cold stamping die, diamond saw blade |
| CN106984808B (en) * | 2017-04-10 | 2018-11-02 | 四川理工学院 | A kind of method for preparing powder metallurgy of localization enhancing composite material |
| CN107366735A (en) * | 2017-08-04 | 2017-11-21 | 扬州海昌新材股份有限公司 | A kind of helical gear and preparation method thereof |
| CN108098083A (en) * | 2017-12-27 | 2018-06-01 | 四川国鑫机械制造有限公司 | Combined tap and drill |
| CN108097973B (en) * | 2017-12-29 | 2019-11-22 | 合肥波林新材料股份有限公司 | A kind of sintered powder material preparation method |
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