CN110877105A - Manufacturing method of hard rolling teeth - Google Patents
Manufacturing method of hard rolling teeth Download PDFInfo
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- CN110877105A CN110877105A CN201911127758.0A CN201911127758A CN110877105A CN 110877105 A CN110877105 A CN 110877105A CN 201911127758 A CN201911127758 A CN 201911127758A CN 110877105 A CN110877105 A CN 110877105A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 32
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 28
- 239000010941 cobalt Substances 0.000 claims abstract description 28
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011230 binding agent Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 17
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 15
- 239000011733 molybdenum Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 15
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910003470 tongbaite Inorganic materials 0.000 claims abstract description 14
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001238 wet grinding Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 10
- 239000010937 tungsten Substances 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000001694 spray drying Methods 0.000 claims abstract description 8
- 229910003468 tantalcarbide Inorganic materials 0.000 claims abstract description 8
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 8
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 27
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 24
- 238000000498 ball milling Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 30
- 238000005452 bending Methods 0.000 description 11
- 238000000227 grinding Methods 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000007373 indentation Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000012188 paraffin wax Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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Classifications
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
-
- B22F1/0003—
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides a manufacturing method of a hard rolling tooth, which comprises the following steps of 1, selecting the following materials in percentage by weight (79.7-82): (18-20.3): (0-1.2) taking tungsten carbide powder, a binder and an additive as raw materials, wherein the binder comprises a mixture of cobalt, nickel and at least one of iron, molybdenum and tungsten; the additive is at least one of vanadium, tantalum, vanadium carbide, tantalum carbide and chromium carbide; step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder; step 3, compacting and sintering the mixed fine powder to obtain a blank; and 4, polishing the blank to obtain the hard rolling tooth. According to the invention, nickel with low price is adopted to replace part of cobalt, and iron, molybdenum and tungsten are added to be combined with nickel and cobalt to inhibit the growth of crystal grains, so that the wear resistance of the sintered blank is improved, and the hardness, strength and fracture toughness of the product are greatly improved through the additives such as vanadium, tantalum, vanadium carbide, tantalum carbide, chromium carbide and the like.
Description
Technical Field
The invention belongs to the field of rolling tooth synthesis, and particularly relates to a manufacturing method of a hard rolling tooth.
Background
The roller press, also known as a calender and a double-roller machine, is mainly used for extruding hard materials such as cement raw clinker, ore and the like, a rolling tooth (a roller press stud) is a columnar tooth arranged on a roller of the roller press, and after the roller press is started, the roller rotates to drive the rolling tooth to extrude and crush the materials. The domestic roller press is introduced in Wedak-Hongbao limited company in Germany, the domestic roller press is generally made by adding cobalt into tungsten carbide and then firing the tungsten carbide into roller teeth, along with the increasing requirements on the extrusion efficiency and the extrusion amount of the roller press, the requirements on the wear resistance and the fracture toughness of the roller pressing teeth are higher and higher, the price of cobalt used as a conventional binder is continuously increased and the resources are in shortage, how to improve the wear resistance and the fracture toughness of the roller pressing teeth while reducing the cobalt dosage becomes a difficult problem in the field, and who grasps the technology first, the technology occupies a favorable position in market competition.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for manufacturing a hard rolled tooth having high wear resistance and high fracture toughness.
In order to achieve the above purpose, the invention adopts the technical scheme that: a manufacturing method of hard rolling teeth comprises the following steps:
step 1, selecting the following materials in weight ratio (79.7-82): (18-20.3): (0-1.2) taking tungsten carbide powder, a binder and an additive as raw materials, wherein the binder comprises a mixture of cobalt, nickel and at least one of iron, molybdenum and tungsten; the additive is at least one of vanadium, tantalum, vanadium carbide, tantalum carbide and chromium carbide;
step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder;
step 3, compacting and sintering the mixed fine powder to obtain a blank;
and 4, polishing the blank to obtain the hard rolling tooth.
The grinding process can be selected from a coreless mill, a tool mill and a means of processing a spherical crown by a forming grinding wheel, a plane mill and the like. An example of a rolling tooth (or pin of a roller press) having a spherical mounting surface is described below.
1. And (3) coreless grinding: and sintering the pressed compact to obtain a hard alloy rolling tooth (stud) blank, processing according to the size by using a coreless grinding machine, cooling to room temperature after processing, taking out, wiping, and strictly performing other processing technical requirements according to process requirements.
2. Machining a spherical crown (pressure bearing matching surface): and (4) processing the spherical crown by using a tool grinder and a formed grinding wheel. The machining process is carried out strictly according to the process.
3. Plane grinding: and (3) processing the working surface of the rolling tooth by adopting a surface grinder, cooling to room temperature after processing, fishing out, wiping, and carrying out other processing technical requirements strictly according to the process requirements.
In the invention, nickel with lower price is adopted to replace part of cobalt, the cost is reduced while the bonding effect is not influenced, and simultaneously, iron, molybdenum and tungsten are added to be combined with the nickel and cobalt to inhibit the growth of crystal grains, thereby improving the wear resistance of a fired blank, reducing the hardness and strength of a product while increasing the fracture toughness of the product, overcoming the defects through additives such as vanadium, tantalum, vanadium carbide, tantalum carbide, chromium carbide and the like, greatly improving the hardness, strength and fracture toughness of the product as a whole, enabling the hardness of the prepared hard alloy tooth to reach more than HRA87, the bending strength to reach more than 3500MPa, and the fracture toughness (indentation method) to reach 48MPa1/2The above.
Specifically, in the binder in the step 1, the content of cobalt is (60-80) wt%, the content of nickel is (5-25) wt%, the content of iron is (0-20) wt%, the content of molybdenum is (0-14) wt%, and the content of tungsten is (0-18) wt%.
Optimally, the weight ratio of the raw materials selected in the step 1 is 81.3: 18: 0.7 of tungsten carbide powder, a binder and an additive are used as raw materials; wherein, the binder is a mixture of cobalt, nickel and molybdenum, and the binder contains 80 wt% of cobalt, 19.8 wt% of nickel and 0.2 wt% of molybdenum; the additive is a mixture of chromium carbide and vanadium carbide, wherein the content of the chromium carbide in the additive is 71.5 wt%, and the content of the vanadium carbide in the additive is 28.5 wt%.
The wet grinding process in the step 2 is a rolling ball grinding process, hexane is used as a wet grinding medium, paraffin is used as a forming agent, and the liquid-solid ratio is hexane: and (0.40-0.45) L: 1kg, the ball-material ratio is 3.5-4.5: 1, and the wet grinding time is 16-60 hours.
Spray drying: paraffin is used as a forming agent, and N is used under the pressure action of the nozzle diameter of 1.4mm and the pressure of a spray tower of 12.0-12.5MPa2Spray drying is carried out, the inlet temperature of nitrogen entering the spray tower is controlled to be 65-70 ℃, and the outlet temperature of the spray tower is controlled to be 40-45 ℃. The working principle of the method is that after ball milling, the mixture slurry which is uniformly stirred and contains hexane is pumped to a nozzle at the lower part of a drying chamber to be sprayed upwards, and hot nitrogen flow which is pressurized by a pressure fan and flows from top to bottom is dried to remove hexane. The mixture containing paraffin falls into a tower bottom charging bucket in a spherical shape; the hexane steam with a small amount of mixture dust and hot nitrogen flow are sent to a washing tower and a refrigerator by a blower (powder enters a cyclone dust collector for recovery), and hexane is condensed and recovered; the current-carrying nitrogen is pressed to the gas heating chamber through the pressure fan. The whole drying process is a closed cycle system, and the drying, mixing (wax mixing) and granulating are completed in a continuous process.
Preparation of a green compact: the product is formed by adopting bidirectional compression, but the product has a larger height-diameter ratio, so that higher requirements are provided for the compression stroke of a press, and the height-diameter ratio is larger, so that the density distribution of the product is involved, therefore, in order to realize the production of the product, the shrinkage coefficient of a die is adjusted, the pressure maintaining time of compression is increased relative to an engineering spherical tooth, the compression rate is adjusted to be 25HZ (namely 5 times/min), the pressure maintaining time is more than or equal to 5 seconds, the compression pressure is 320-800 MPa, and the quality of a pressed blank is ensured.
The sintering process in the step 3 comprises the following steps: sintering under 0-5 MPa and 1390-1440 ℃ for 50-120 minutes.
The invention has the beneficial effects that:
according to the manufacturing method of the hard rolling tooth, nickel with low price is adopted to replace part of cobalt, the cost is reduced while the bonding effect is not influenced, meanwhile, iron, molybdenum and tungsten are added to be combined with the nickel and the cobalt to inhibit the growth of crystal grains, so that the wear resistance of a sintered blank is improved, the product hardness and strength can be reduced while the product fracture toughness is increased, the defects can be compensated through additives such as vanadium, tantalum, vanadium carbide, tantalum carbide and chromium carbide, and the hardness, strength and fracture toughness of the product can be integrally improved at the same timeGreatly improved, the hardness of the prepared hard alloy tooth can reach more than HRA87, the bending strength can reach more than 3500MPa, and the fracture toughness (indentation method) can reach 48MPa1/2The above.
Drawings
FIG. 1 is a metallographic photograph of a hard rolled tooth obtained in example 1;
FIG. 2 is a metallographic photograph of a hard rolled tooth obtained in example 2;
FIG. 3 is a metallographic photograph of hard rolled teeth obtained in example 3;
FIG. 4 is a metallographic photograph of a hard rolled tooth obtained in comparative example 1;
FIG. 5 is a metallographic photograph of a hard rolled tooth obtained in comparative example 2;
FIG. 6 is a metallographic photograph of a hard rolled tooth obtained in comparative example 3;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
The embodiment provides a manufacturing method of a hard rolling tooth, which comprises the following steps:
step 1, selecting 81.3 weight ratio: 18: 0.7 of tungsten carbide powder, a binder and an additive, wherein the binder contains 80 wt% of cobalt, 19.8 wt% of nickel and 0.2 wt% of molybdenum; the content of vanadium carbide in the additive is 28.6 wt%, and the content of chromium carbide in the additive is 71.4 wt%;
step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder;
step 3, compacting and sintering the mixed fine powder to obtain a blank; wherein, the sintering conditions are as follows: the pressure sintering was carried out at 1400 ℃ under 4.5MPa for 90 minutes.
And 4, performing coreless grinding on the rough blank to obtain the hard rolling tooth.
The hardness of the cemented carbide tooth manufactured in this example was HRA87.4, the bending strength was 3560MPa, and the fracture toughness (indentation method) was 48.1MPa.m1/2。
Example 2
The embodiment provides a manufacturing method of a hard rolling tooth, which comprises the following steps:
step 1, selecting 81.65: 18: 0.35 of tungsten carbide powder, a binder and an additive, wherein the binder contains 76.1 wt% of cobalt, 10.2 wt% of nickel, 13.7 wt% of molybdenum and 6.65 wt% of tungsten; the additive is chromium carbide;
step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder;
step 3, compacting and sintering the mixed fine powder to obtain a blank; wherein, the sintering conditions are as follows: the pressure sintering was carried out at 4MPa and 1440 ℃ for 90 minutes.
And 4, machining the blank by using a forming grinding wheel to obtain the hard rolling tooth.
The hardness of the prepared hard alloy tooth is HRA87.5, the bending strength is 3580MPa, and the fracture toughness (indentation method) is 48.4MPa.m1/2。
Example 3
The embodiment provides a manufacturing method of a hard rolling tooth, which comprises the following steps:
step 1, selecting a material with the weight ratio of 80.95: 18: 1.05 taking tungsten carbide powder, a binder and an additive as raw materials, wherein the binder contains 65 wt% of cobalt, 12.3 wt% of nickel, 5.1 wt% of iron, 4.1 wt% of molybdenum and 13.5 wt% of tungsten; in the additive, the content of vanadium is 5 wt%, the content of tantalum is 5 wt%, the content of vanadium carbide is 7 wt%, the content of tantalum carbide is 8 wt%, and the content of chromium carbide is 75 wt%;
step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder;
step 3, compacting and sintering the mixed fine powder to obtain a blank; wherein, the sintering conditions are as follows: the pressure sintering was carried out at 1420 ℃ under 5.0MPa for 90 minutes.
And 4, performing coreless grinding on the rough blank to obtain the hard rolling tooth.
The hardness of the cemented carbide tooth manufactured by the embodiment is HRA87.6, and the hardness is resistant toThe bending strength is 3590MPa, and the fracture toughness (indentation method) is 48.8MPa1/2。
Comparative example 1
This comparative example is a comparative example of example 1, which employed the same tungsten carbide powder and binder as in example 1 in step 1, except that the addition of additives was eliminated and steps 2 and 3 were the same as steps 2 and 3 of example 1.
In this example, a control roller tooth with a hardness of HRA85.1, a bending strength of 2890MPa and a fracture toughness (indentation method) of 27.1MPa. m was produced by removing the additive from example 11/2。
Comparative example 2
This comparative example is that of example 3, which used the same tungsten carbide powder and binder as in example 3 in step 1, except that the addition of additives was eliminated and steps 2 and 3 were the same as steps 2 and 3 of example 3.
In this example, a control roller tooth with a hardness of HRA86.3, a bending strength of 2920MPa and a fracture toughness (indentation method) of 27.0MPa.m was produced, compared to example 1, without the addition of additives1/2。
Comparative example 3
This comparative example is another comparative example based on comparative example 2 in example 3, which employed the same weight ratio of tungsten carbide powder and binder in step 1 as in example 3, except that the binder was cobalt and the addition of additives was eliminated, and steps 2 and 3 were the same as steps 2 and 3 of example 3.
In this example, a conventional mixture of tungsten carbide and cobalt was used as a raw material to prepare a conventional roll tooth having a hardness of HRA86.7, a bending strength of 3020MPa, and a fracture toughness (indentation method) of 22.1MPa.m1/2。
The roll teeth obtained in examples 1 to 3 and comparative examples 1 to 3 were tested for hardness, flexural strength, and fracture toughness, and the test results are shown in table 1 below:
table 1 results of performance testing
| hardness/HRA | Flexural strength/MPa | Fracture toughness/MPa.m1/2 | |
| Example 1 | 87.4 | 3560 | 48.1 |
| Example 2 | 87.5 | 3580 | 48.4 |
| Example 3 | 87.6 | 3590 | 48.8 |
| Comparative example 1 | 85.1 | 2910 | 27.1 |
| Comparative example 2 | 86.3 | 2920 | 27.0 |
| Comparative example 3 | 86.7 | 3020 | 22.1 |
As can be seen from the test results in table 1 above in conjunction with fig. 1 to 3, the rolling teeth prepared by the method and parameters provided by the present invention in examples 1 to 3 have high hardness, bending strength, fracture toughness, etc., uniform crystal grains and few pores;
the rolling teeth obtained by eliminating the use of the additive in comparative example 1 have lower hardness, strength and fracture toughness than those of example 1, and as can be seen from comparative gold phase diagrams 2 and 4, the rolling teeth of comparative example 1 have larger grains and larger pools than those of example 1;
the use of the additive is eliminated in the comparative example 2, the properties of the prepared rolling tooth are higher than those of the rolling tooth in the example 3 in hardness, strength and fracture toughness, and as can be seen from comparison of the gold phase diagrams 3 and 5, the comparative example 2 has lath-shaped crystal grains and a larger cobalt layer thickness than the comparative example 3;
in comparative example 3, the conventional tungsten carbide and cobalt are used as raw materials, and in comparative example 2, part of cobalt is replaced by nickel compared with comparative example 3, so that the fracture toughness of the prepared rolling tooth is greatly improved compared with that of comparative example 3, but the hardness and the strength are reduced, and as can be seen from comparative gold phase diagrams 4 and 6, comparative example 3 has coarser WC grains and a cobalt layer is thinner than that of comparative example 2; in combination with the embodiment 3 and the embodiment 1, it is known that, although the hardness and strength of the product are reduced by replacing part of cobalt in the binder with nickel, the hardness, strength and fracture toughness of the product are greatly improved as a whole while the above defects are compensated by additives such as vanadium, tantalum, vanadium carbide, tantalum carbide, chromium carbide, etc., and the rolling teeth manufactured by the method (embodiment 3) provided by the present invention have the hardness improved by more than 1%, the bending strength improved by more than 18% and the fracture toughness improved by more than 1 time compared with the rolling teeth manufactured by the conventional method (comparative example 3).
In conclusion, the method provided by the invention can be used for preparing the high-quality hard alloy rolling teeth with high hardness, high bending strength and high fracture toughness.
The above examples of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes or modifications which are encompassed by the present invention are within the scope of the present invention.
Claims (5)
1. The manufacturing method of the hard rolling teeth is characterized by comprising the following steps:
step 1, selecting the following materials in weight ratio (79.7-82): (18-20.3): (0-1.2) taking tungsten carbide powder, a binder and an additive as raw materials, wherein the binder comprises a mixture of cobalt, nickel and at least one of iron, molybdenum and tungsten; the additive is at least one of vanadium, tantalum, vanadium carbide, tantalum carbide and chromium carbide;
step 2, mixing the raw materials, wet-grinding, and spray-drying to obtain mixed fine powder;
step 3, compacting and sintering the mixed fine powder to obtain a blank;
and 4, polishing the blank to obtain the hard rolling tooth.
2. The method for manufacturing a hard roll tooth according to claim 1, wherein the binder of step 1 contains cobalt (60 to 80 wt%), nickel (5 to 25 wt%), iron (0 to 20 wt%), molybdenum (0 to 14 wt%) and tungsten (0 to 18 wt%).
3. The method for manufacturing a hard rolled tooth according to claim 1 or 2, wherein the step 1 is performed by selecting a hard rolled tooth having a weight ratio of 81.3: 18: 0.7 of tungsten carbide powder, a binder and an additive are used as raw materials; wherein, the binder is a mixture of cobalt, nickel and molybdenum, and the binder contains 80 wt% of cobalt, 19.8 wt% of nickel and 0.2 wt% of molybdenum; the additive is a mixture of chromium carbide and vanadium carbide, wherein the content of the chromium carbide in the additive is 71.5 wt%, and the content of the vanadium carbide in the additive is 28.5 wt%.
4. The method for manufacturing a hard rolled tooth according to claim 1, wherein the wet grinding process in the step 2 is: adopting a rolling ball milling process, taking hexane as a wet milling medium, wherein the liquid-solid ratio is that the ratio of hexane: and (0.40-0.45) L: 1kg, the ball-material ratio is 3.5-4.5: 1, and the wet grinding time is 16-60 hours.
5. The method for manufacturing a hard rolled tooth according to claim 1, wherein the sintering process in the step 3 is: sintering under 0-5 MPa and 1390-1440 ℃ for 50-120 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911127758.0A CN110877105A (en) | 2019-11-18 | 2019-11-18 | Manufacturing method of hard rolling teeth |
Applications Claiming Priority (1)
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