CN102994791A - Preparation method of hard alloy for producing numerical control blades - Google Patents
Preparation method of hard alloy for producing numerical control blades Download PDFInfo
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- CN102994791A CN102994791A CN2012105051049A CN201210505104A CN102994791A CN 102994791 A CN102994791 A CN 102994791A CN 2012105051049 A CN2012105051049 A CN 2012105051049A CN 201210505104 A CN201210505104 A CN 201210505104A CN 102994791 A CN102994791 A CN 102994791A
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Abstract
The invention relates to a preparation method of hard alloy for producing a numerical control cutter blade. The preparation method comprises the steps of material proportioning, wet grinding, drying, pressing and sintering to produce hard alloy, wherein the materials comprises the following by weight percent: 86.6-88.7 wt% of WC, 5.8-6.4 wt% of Co, 4-5 wt% of TaC and 1.5-2 wt% of TiC. The hardness (HRA) of the hard alloy produced according to the method reaches 92.5-94, the strength is more than or equal to 2250N/nm<2>, and the density is 14-14.3 g/cm<3>. The numerical control blades made of the hard alloy according to the method have the performances of the hard alloy, totally meet the hardness requirements of hardened steel compared with the numerical control blades made of the existing hard alloy, and have good abrasion resistance and good toughness; and the blade edge does not burst during machining of hardened steel.
Description
Technical field
The present invention relates to a kind of preparation method of the Wimet for the manufacture of digital cuttings.
Background technology
As everyone knows, hardened steel is a kind of comparatively unmanageable material.Hardened steel is when cutting: 1, hardness is high, intensity is high, does not almost have plasticity; 2: cutting force is large, cutting temperature is high: 3, be difficult for producing built-up edge; 4, blade easily collapses broken, wearing and tearing; 5, thermal conductivity is low.Because the characteristic during its machining, the digital cuttings that present stage processing hardened steel uses relies on external import mostly.Because the performance of Wimet has determined that the blade that adopts the Wimet on the existing market to make can't process hardened steel on the existing market at all, blade is not that to collapse broken be exactly that the blade wear resistance is inadequate to blade during use.The characteristic of Wimet material is hard rising strength degradation.Realize very high hardness not only will being arranged but also good intensity will being arranged the processing blades material of hardened steel, be beneficial to the raising of Workpiece Machining Accuracy.
Summary of the invention
In order to address the above problem, the invention provides that a kind of technique is simple, the preparation method of the Wimet of the digital cuttings that is applicable to make processing hardened steel.
To achieve these goals, the present invention is mainly solved by the following technical programs: a kind of preparation method of the Wimet for the manufacture of digital cuttings, comprise that batching, wet-milling, drying, compacting and sintering make Wimet, in the described batching step, batching comprises following composition: 86.6-88.7wt%WC, 5.8-6.4wt%Co, 4-5wt%TaC and 1.5-2wt%TiC.
As preferably, the Fei Shi mean particle size of above-mentioned WC is that the Fei Shi mean particle size of 0.8um, Co is that the Fei Shi mean particle size of 1 um, TaC is 1um, and the Fisher particle size of TiC is 1.5um.
As preferably, above-mentioned wet-milling step is by the ball mill ball milling, and the ball milling parameter is: drum's speed of rotation is that 33-36rpm, stacking factor are 0.45, solid-to-liquid ratio is that 3:1, milling time are that 45-60 hour, ratio of grinding media to material are 5:1.
As preferably, in above-mentioned every kilogram batching, add 230-270ml concentration and be the alcohol of 92-94mol/L as ball-milling medium.
As preferably, this preparation method also comprises whipping step: the batching before dry after the wet-milling is stirred until it is even.
As preferably, above-mentioned drying step is: the batching after will stirring is dry by the drying tower that is filled with nitrogen after nozzle atomization, and spray-dired parameter is: oxygen level in the bore of nozzle: 1.0-1.3mm, atomizing pressure: 1000-1300Kpa, tower internal pressure≤4.1Kpa, the tower≤3.0%, nitrogen inlet temperature of stabilizer are that 200-210 ℃, nitrogen tower exit temperature are 90-100 ℃.
As preferably, above-mentioned pressing step adopts 20 tons of mouldenpresses, and the compacting parameter is: 8-12 beats/min.
As preferably, the hydrogen flow is in the above-mentioned sintering step: 5000-6000ml/h, and sintering temperature is: 1410 ℃-1440 ℃, pressurization: 5000Kpa.
The hardness (HRA) of the Wimet by aforesaid method preparation has reached 92.5-94, intensity 〉=2250N/mm2, density is 14～14.3g/cm3.So digital cuttings of making by the Wimet of aforesaid method preparation, the performance that has possessed this Wimet, have following outstanding advantage with respect to the digital cuttings of making by existing Wimet: 1, hardness (HRA) has reached 92.5-94, and the hardness requirement and the wear resistance that reach processing hardened steel fully might as well; 2, good toughness, processing during hardened steel blade can not occur collapsing broken, prolonged 1-2 work-ing life doubly.
Embodiment
The below is described in further detail the embodiment of technical scheme of the present invention.
Embodiment 1: a kind of preparation method of the Wimet for the manufacture of digital cuttings comprises:
(1) batching: comprise following composition: 87.6wt%WC, 6.2wt%Co, 4.5wt%TaC and 1.7wt%TiC.
The Fei Shi mean particle size of above-mentioned WC is that the Fei Shi mean particle size of 0.8um, Co is that the Fei Shi mean particle size of 1 um, TaC is 1um, and the Fisher particle size of TiC is 1.5um.
(2) wet-milling: in the batching at every kilogram, add 230-270ml concentration and be the alcohol of 92-94mol/L as ball-milling medium; The wet-milling step is by the ball mill ball milling, and the ball milling parameter is: drum's speed of rotation is that 33-36rpm, stacking factor are 0.45, solid-to-liquid ratio is that 3:1, milling time are that 45-60 hour, ratio of grinding media to material are 5:1.
(3) stir: stir until it is even after the batching after the above-mentioned wet-milling is removed impurity through 220 purpose wet screenings.Make its feedstock particle size by the nozzle ejection even after stirring mixes the batching after the wet-milling, reach at last substance in the later stage pressing process (fluctuation) error and reduce, improve the precision of product appearance size, improved compacting efficient.
(4) drying: the batching after will stirring is dry by the drying tower that is filled with nitrogen after nozzle atomization, realizes solid-liquid separation, liquids recovery and solid globules granulation, and the pellet of ejection enters in the charging basket by 40 order dry screens through the transmission of spiral cooling table, cooling.Spray-dired parameter is: oxygen level in the bore of nozzle: 1.0-1.3mm, atomizing pressure: 1000-1300Kpa, tower internal pressure≤4.1Kpa, the tower≤3.0%, nitrogen inlet temperature of stabilizer are that 200-210 ℃, nitrogen tower exit temperature are 90-100 ℃.
(5) compacting: pressing step adopts 20 tons of mouldenpresses, adjusts work loading height, pull-down stroke, pressing stroke and top and presses stroke, and compound is poured hopper into, begins the compacting debugging, after compacting finishes, takes out pressed compact; The compacting parameter is: 8-12 beats/min.
(6) sintering: the boat that product will be housed is loaded in by processing requirement to be sent on the coal charger in the stove, closes the upper furnace door sintering after carefully cleaning the oven door sealing band and evenly being coated with the last layer vacuum grease; The hydrogen flow is in the sintering step: 5000-6000ml/h, and sintering temperature is: 1410 ℃-1440 ℃, pressurization: 5000Kpa.
By the hard metal alloys that above-mentioned preparation method makes, hardness (HRA) is 93.5, intensity is 2350N/mm
2, density is 14.05g/cm
3The digital cuttings that is used for processing hardened steel that the Wimet of such performance is made, it is because comprised the performance of Wimet itself, so its hardness has reached the hardness requirement of processing hardened steel fully, so wear resistance might as well, and when having guaranteed hardness again, also guaranteed intensity, so that its good toughness, so processing during hardened steel blade can not occur collapsing broken, prolonged 1-2 work-ing life doubly, also improved the working accuracy of hardened steel workpiece.
Embodiment 2: a kind of preparation method of the Wimet for the manufacture of digital cuttings comprises:
(1) batching: comprise following composition: 88.7wt%WC, 5.8wt%Co, 4wt%TaC and 1.5wt%TiC.
The Fei Shi mean particle size of above-mentioned WC is that the Fei Shi mean particle size of 0.8um, Co is that the Fei Shi mean particle size of 1 um, TaC is 1um, and the Fisher particle size of TiC is 1.5um.
(2) wet-milling: in the batching at every kilogram, add 230-270ml concentration and be the alcohol of 92-94mol/L as ball-milling medium; The wet-milling step is by the ball mill ball milling, and the ball milling parameter is: drum's speed of rotation is that 33-36rpm, stacking factor are 0.45, solid-to-liquid ratio is that 3:1, milling time are that 45-60 hour, ratio of grinding media to material are 5:1.
(3) stir: stir until it is even after the batching after the above-mentioned wet-milling is removed impurity through 220 purpose wet screenings.Make its feedstock particle size by the nozzle ejection even after stirring mixes the batching after the wet-milling, reach at last substance in the later stage pressing process (fluctuation) error and reduce, improve the precision of product appearance size, improved compacting efficient.
(4) drying: the batching after will stirring is dry by the drying tower that is filled with nitrogen after nozzle atomization, realizes solid-liquid separation, liquids recovery and solid globules granulation, and the pellet of ejection enters in the charging basket by 40 order dry screens through the transmission of spiral cooling table, cooling.Spray-dired parameter is: oxygen level in the bore of nozzle: 1.0-1.3mm, atomizing pressure: 1000-1300Kpa, tower internal pressure≤4.1Kpa, the tower≤3.0%, nitrogen inlet temperature of stabilizer are that 200-210 ℃, nitrogen tower exit temperature are 90-100 ℃.
(5) compacting: pressing step adopts 20 tons of mouldenpresses, adjusts work loading height, pull-down stroke, pressing stroke and top and presses stroke, and compound is poured hopper into, begins the compacting debugging, after compacting finishes, takes out pressed compact; The compacting parameter is: 8-12 beats/min.
(6) sintering: the boat that product will be housed is loaded in by processing requirement to be sent on the coal charger in the stove, closes the upper furnace door sintering after carefully cleaning the oven door sealing band and evenly being coated with the last layer vacuum grease; The hydrogen flow is in the sintering step: 5000-6000ml/h, and sintering temperature is: 1410 ℃-1440 ℃, pressurization: 5000Kpa.
By the hard metal alloys that above-mentioned preparation method makes, hardness (HRA) is 93, intensity is 2550N/mm
2, density is 14.25g/cm
3The digital cuttings that is used for processing hardened steel that the Wimet of such performance is made, it is because comprised the performance of Wimet itself, so its hardness has reached the hardness requirement of processing hardened steel fully, so wear resistance might as well, and when having guaranteed hardness again, also guaranteed intensity, so that its good toughness, so processing during hardened steel blade can not occur collapsing broken, prolonged 1-2 work-ing life doubly, also improved the working accuracy of hardened steel workpiece.
Embodiment 3: a kind of preparation method of the Wimet for the manufacture of digital cuttings comprises:
(1) batching: comprise following composition: 86.6wt%WC, 6.4wt%Co, 5wt%TaC and 2wt%TiC.
The Fei Shi mean particle size of above-mentioned WC is that the Fei Shi mean particle size of 0.8um, Co is that the Fei Shi mean particle size of 1 um, TaC is 1um, and the Fisher particle size of TiC is 1.5um.
(2) wet-milling: in the batching at every kilogram, add 230-270ml concentration and be the alcohol of 92-94mol/L as ball-milling medium; The wet-milling step is by the ball mill ball milling, and the ball milling parameter is: drum's speed of rotation is that 33-36rpm, stacking factor are 0.45, solid-to-liquid ratio is that 3:1, milling time are that 45-60 hour, ratio of grinding media to material are 5:1.
(3) stir: stir until it is even after the batching after the above-mentioned wet-milling is removed impurity through 220 purpose wet screenings.Make its feedstock particle size by the nozzle ejection even after stirring mixes the batching after the wet-milling, reach at last substance in the later stage pressing process (fluctuation) error and reduce, improve the precision of product appearance size, improved compacting efficient.
(4) drying: the batching after will stirring is dry by the drying tower that is filled with nitrogen after nozzle atomization, realizes solid-liquid separation, liquids recovery and solid globules granulation, and the pellet of ejection enters in the charging basket by 40 order dry screens through the transmission of spiral cooling table, cooling.Spray-dired parameter is: oxygen level in the bore of nozzle: 1.0-1.3mm, atomizing pressure: 1000-1300Kpa, tower internal pressure≤4.1Kpa, the tower≤3.0%, nitrogen inlet temperature of stabilizer are that 200-210 ℃, nitrogen tower exit temperature are 90-100 ℃.
(5) compacting: pressing step adopts 20 tons of mouldenpresses, adjusts work loading height, pull-down stroke, pressing stroke and top and presses stroke, and compound is poured hopper into, begins the compacting debugging, after compacting finishes, takes out pressed compact; The compacting parameter is: 8-12 beats/min.
(6) sintering: the boat that product will be housed is loaded in by processing requirement to be sent on the coal charger in the stove, closes the upper furnace door sintering after carefully cleaning the oven door sealing band and evenly being coated with the last layer vacuum grease; The hydrogen flow is in the sintering step: 5000-6000ml/h, and sintering temperature is: 1410 ℃-1440 ℃, pressurization: 5000Kpa.
By the hard metal alloys that above-mentioned preparation method makes, hardness (HRA) is 94, intensity is 2250N/mm
2, density is 14.05g/cm
3The digital cuttings that is used for processing hardened steel that the Wimet of such performance is made, it is because comprised the performance of Wimet itself, so its hardness has reached the hardness requirement of processing hardened steel fully, so wear resistance might as well, and when having guaranteed hardness again, also guaranteed intensity, so that its good toughness, so processing during hardened steel blade can not occur collapsing broken, prolonged 1-2 work-ing life doubly, also improved the working accuracy of hardened steel workpiece.
Claims (8)
1. preparation method for the manufacture of the Wimet of digital cuttings, comprise that batching, wet-milling, drying, compacting and sintering make Wimet, it is characterized in that, in the described batching step, batching comprises following composition: 86.6-88.7wt%WC, 5.8-6.4wt%Co, 4-5wt%TaC and 1.5-2wt%TiC.
2. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 1, it is characterized in that, the Fei Shi mean particle size of described WC is that the Fei Shi mean particle size of 0.8um, Co is that the Fei Shi mean particle size of 1 um, TaC is 1um, and the Fisher particle size of TiC is 1.5um.
3. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 1 and 2, it is characterized in that, described wet-milling step is by the ball mill ball milling, and the ball milling parameter is: drum's speed of rotation is that 33-36rpm, stacking factor are 0.45, solid-to-liquid ratio is that 3:1, milling time are that 45-60 hour, ratio of grinding media to material are 5:1.
4. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 3 is characterized in that, adds 230-270ml concentration and be the alcohol of 92-94mol/L in every kilogram batching as ball-milling medium.
5. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 1 and 2 is characterized in that this preparation method also comprises whipping step: the batching before dry after the wet-milling is stirred until it is even.
6. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 5, it is characterized in that, described drying step is: the batching after will stirring is dry by the drying tower that is filled with nitrogen after nozzle atomization, and spray-dired parameter is: oxygen level in the bore of nozzle: 1.0-1.3mm, atomizing pressure: 1000-1300Kpa, tower internal pressure≤4.1Kpa, the tower≤3.0%, nitrogen inlet temperature of stabilizer are that 200-210 ℃, nitrogen tower exit temperature are 90-100 ℃.
7. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 1 and 2 is characterized in that, described pressing step adopts 20 tons of mouldenpresses, and the compacting parameter is: 8-12 beats/min.
8. the preparation method of a kind of Wimet for the manufacture of digital cuttings according to claim 1 and 2 is characterized in that the hydrogen flow is in the described sintering step: 5000-6000ml/h, and sintering temperature is: 1410 ℃-1440 ℃, pressurization: 5000Kpa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313445A (en) * | 2014-09-30 | 2015-01-28 | 苏州博利迈新材料科技有限公司 | Tungsten titanium tantalum cobalt hard alloy coated with silicon dioxide and preparation method of tungsten titanium tantalum cobalt hard alloy |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102080A (en) * | 1985-04-01 | 1986-09-17 | 机械工业部成都工具研究所 | Hard alloy base material used for coating tool bits |
| CN101629263A (en) * | 2009-08-06 | 2010-01-20 | 江西稀有稀土金属钨业集团有限公司 | Ultrafine cemented carbide and preparation method and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102080A (en) * | 1985-04-01 | 1986-09-17 | 机械工业部成都工具研究所 | Hard alloy base material used for coating tool bits |
| CN101629263A (en) * | 2009-08-06 | 2010-01-20 | 江西稀有稀土金属钨业集团有限公司 | Ultrafine cemented carbide and preparation method and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104313445A (en) * | 2014-09-30 | 2015-01-28 | 苏州博利迈新材料科技有限公司 | Tungsten titanium tantalum cobalt hard alloy coated with silicon dioxide and preparation method of tungsten titanium tantalum cobalt hard alloy |
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Application publication date: 20130327 |