CN103231052B - A kind of powder metallurgy central gear and preparation method thereof - Google Patents
A kind of powder metallurgy central gear and preparation method thereof Download PDFInfo
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Abstract
The invention provides a kind of powder metallurgy central gear, suppressed forming by the powder stock of following weight portion: iron powder 100, copper powder 1.8-2.0, molybdenum powder 0.5-0.8, vanadium powder 0.1-0.3, nickel powder 0.8-1.2, graphite powder 0.5-0.8, modification tree ash 0.1-0.3, rare earth ferrosilicon alloy 0.2-0.6, Cr powder 0.1-0.3, ethylene bis stearic acid amide 0.1-0.2, WS2 0.1-0.3, yttrium powder 0.2-0.4, boron nitride 0.2-0.4, molybdenum sulfide 0.4-0.5.First substep mixing is carried out to powder stock during preparation, then final products central gear is obtained after repressed, sintering, heat treatment, surface treatment, it is good that the powder metallurgy central gear produced has wearability, intensity is high, hardness is high, machinability is good, corrosion-resistant, not easily occur fracture, the feature of long service life.
Description
Technical field
The present invention relates to field of powder metallurgy, be specifically related to a kind of powder metallurgy central gear and preparation method thereof.
Background technology
PM technique, with the parts of the shape production requirement high dimensional accuracy extremely close with article shape, complicated shape, can reduce cutting cost significantly.Therefore, sintered metal product as various machinery, device parts and utilize in many-side.
Generally speaking, the alloy powder such as mixing graphite powder and the lubricant powder such as stearic acid, Cr powder in iron-based powder and after forming iron-based powder mixed powder, this iron-based powder mixed powder is filled into metal die, press molding and the metallurgy iron-based powder formed body (powder compact) that makes powder.Wherein, iron-based powder can be divided into iron powder (straight iron powder etc.), powdered alloy steel etc. according to composition.Further, iron-based powder also can be divided into atomized iron powder, reduced iron powder etc. according to manufacture method.The density of iron-based powder formed body is generally 6.6-7.1 mg/m3.Further sintering processes implemented for these iron-based powder formed bodies and forms sintered body, and implementing finishing, machining and form sintered metal product as required.When needing to improve hot strength, fatigue strength, after sintering, also implement carburizing heat treatment, brightness heat treatment.But existing powdered metal parts, because in formula, the proportion of various raw material is different, be difficult to guarantee during mixing mix, cause the Density inhomogeneity of the green compact be pressed into, pass through heat treatment, the global density of the part of gained is uneven, causes every mechanical property bad.
Summary of the invention
The invention provides a kind of powder metallurgy central gear and preparation method thereof, by the technique of special pulp furnish and science, produce powder metallurgy central gear to have wearability good, intensity is high, hardness is high, machinability is good, corrosion-resistant, not easily occur fracture, the feature of long service life.
The technical solution used in the present invention is as follows:
A kind of powder metallurgy central gear, it is characterized in that, suppressed by the powder stock of following weight portion and form: iron powder 100, copper powder 1.8-2.0, molybdenum powder 0.5-0.8, vanadium powder 0.1-0.3, nickel powder 0.8-1.2, graphite powder 0.5-0.8, modification tree ash 0.1-0.3, rare earth ferrosilicon alloy 0.2-0.6, Cr powder 0.1-0.3, ethylene bis stearic acid amide 0.1-0.2, WS2 0.1-0.3, yttrium powder 0.2-0.4, boron nitride 0.2-0.4, molybdenum sulfide 0.4-0.5, described rare earth ferrosilicon alloy the trade mark be FeSiRE23, granularity 5-20 mm.
The preparation method of described powder metallurgy central gear, is characterized in that, comprise the following steps:
(1) first the base-material iron powder of 40-50% is loaded in high-speed mixer, add the silane resin acceptor kh-550 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, vanadium powder, nickel powder, graphite powder, modification tree ash powder, Cr powder, ethylene bis stearic acid amide and remaining iron powder add wherein successively, mixed at high speed limit, limit is heated, when temperature is raised to 125-130 DEG C, all the other components in formula are all being added wherein, continue mixing 8-10 minute again, then it is allowed to cool, obtain the iron base powder mixture end of even density,
(2) iron base powder mixture end step (1) obtained loads in mould, makes shape at 550-580Mpa pressure;
(3) compressing green compact are placed in sintering furnace, in the protective atmosphere of hydrogen and nitrogen mixed gas, first it is 1000 ~ 1050 DEG C in temperature, sintering time is 10-20 minute, then 1150-1180 DEG C is increased the temperature to the speed of 10-20 DEG C/min, at this temperature, reburn knot 10-15 minute, and then room temperature is down in cooling;
(4) green compact that heat treatment is compressing first carry out normalized treatment in normalizing furnace, are incubated 1-2 hours at 805 ~ 815 DEG C; Carry out Quenching Treatment again after taking-up, send in heat-treatment furnace and be heated to 650-700 DEG C DEG C, and be incubated 2-3 hour; Then, with quenching oil cooling, the gear after quenching is sent at being heated to 500-520 DEG C in tempering furnace and carry out high tempering process, insulation 1.5-2 hour, then carry out lonneal at 155 ~ 165 DEG C, insulation 2-3 hour;
(5) the powder metallurgy central gear after carburizing lonneal, in carburizer, is heated to 875-925 DEG C in the carburizing medium of gaseous state, and isothermal holding 3-5 hour is cooled to 120 DEG C, during insulation 5-8, and then cool to room temperature;
(6) the powder metallurgy central gear after steam treatment carburizing nitrogen is sent in steam oven, and carry out steam treatment, vapor (steam) temperature 600-700 DEG C, isothermal holding time 3-4 hour, is then incubated 2-3 hour, finally naturally cools to room temperature at 200-250 DEG C.
Described powder metallurgy central gear, is characterized in that, in described raw material, the particle diameter of various metal dust is within the scope of 200-400 order.
The preparation method of described powder metallurgy central gear, it is characterized in that, described modification tree ash powder is prepared from by the following method: tree ash is first used the salt acid soak 30-40 minute of 25%, then neutralize with alkali lye, use deionized water rinsing impurity elimination again, mix again and with a small amount of ethanol dissolved dilution NDZ-311 titanate coupling agent, the consumption of NDZ-311 titanate coupling agent is the 1-2% of tree ash weight, add in high speed mixer with Sprayable, discharging after stirring 15-20min, oven dry grinds to form 300-400 order powder, obtain modification tree ash powder.
Advantage of the present invention and beneficial effect:
1. powder metallurgy central gear of the present invention, carry out the mixing of employing substep, ensure that the even density of finished parts is consistent, improve the comprehensive mechanical performance of central gear, add man-hour, in the operation of mixed-powder material, first with coupling agent, part iron powder is soaked, and then alloyed powder and lubricant added in wetting iron powder in proportion mix, finally adding wherein through remaining iron powder, abundant mixing, the mixed-powder of gained is repressed, sintering, heat treatment, surface treatment, finally obtain final product, the powder metallurgy processing technology adopted, significantly reduce manufacturing cost, improve stock utilization and productivity ratio.
2. powder metallurgy central gear of the present invention, adds the metal dust of different proportion in composition of raw materials, makes the central gear prepared reach high strength, the performance of high rigidity and high abrasion; In formula, add appropriate kollag, add the self-lubricating property of product; With the addition of appropriate vanadium powder, modification tree ash powder, improve the intensity of product and anti-wear performance and self-lubricating property.
Detailed description of the invention
Below by embodiment, the present invention is described in further detail, but the present invention is not only confined to following examples.
Embodiment takes following raw materials (kg) iron powder 100, copper powder 1.9, molybdenum powder 0.6, vanadium powder 0.2, nickel powder 1.0, graphite powder 0.7, modification tree ash 0.2, rare earth ferrosilicon alloy 0.5, Cr powder 0.2, ethylene bis stearic acid amide 0.15, WS2 0.2, yttrium powder 0.3, boron nitride 0.3, molybdenum sulfide 0.45, described rare earth ferrosilicon alloy the trade mark be FeSiRE23, granularity 5-20 mm
Preparation method, comprises the following steps:
(1) first the base-material iron powder of 40-50% is loaded in high-speed mixer, add the silane resin acceptor kh-550 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, vanadium powder, nickel powder, graphite powder, modification tree ash powder, Cr powder, ethylene bis stearic acid amide and remaining iron powder add wherein successively, mixed at high speed limit, limit is heated, when temperature is raised to 125-130 DEG C, all the other components in formula are all being added wherein, continue mixing 8-10 minute again, then it is allowed to cool, obtain the iron base powder mixture end of even density,
(2) iron base powder mixture end step (1) obtained loads in mould, makes shape at 550-580Mpa pressure;
(3) compressing green compact are placed in sintering furnace, in the protective atmosphere of hydrogen and nitrogen mixed gas, first it is 1000 ~ 1050 DEG C in temperature, sintering time is 10-20 minute, then increase the temperature to 1150-1180 DEG C with the speed of 5-8 DEG C/min, at this temperature, reburn knot 10-15 minute, then room temperature is down in cooling, is carrying out fine finishining;
(4) green compact that heat treatment is compressing first carry out normalized treatment in normalizing furnace, are incubated 1-2 hours at 805 ~ 815 DEG C; Carry out Quenching Treatment again after taking-up, send in heat-treatment furnace and be heated to 650-700 DEG C DEG C, and be incubated 2-3 hour; Then, with quenching oil cooling, the gear after quenching is sent at being heated to 500-520 DEG C in tempering furnace and carry out high tempering process, insulation 1.5-2 hour, then carry out lonneal at 155 ~ 165 DEG C, insulation 2-3 hour;
(5) the powder metallurgy central gear after carburizing lonneal, in carburizer, is heated to 875-925 DEG C in the carburizing medium of gaseous state, and isothermal holding 3-5 hour is cooled to 120 DEG C, during insulation 5-8, and then cool to room temperature;
(6) the powder metallurgy central gear after steam treatment carburizing nitrogen nitrogen carries out steam treatment, vapor (steam) temperature 600-700 DEG C, processing time 3-4 hour, then at 200-250 DEG C, is incubated 2-3 hour, finally naturally cools to room temperature.
In raw material, the particle diameter of various metal dust is within the scope of 300-400 order.
Modification tree ash powder is prepared from by the following method: tree ash is first used the salt acid soak 30-40 minute of 25%, then neutralize with alkali lye, use deionized water rinsing impurity elimination again, mix again and with a small amount of ethanol dissolved dilution NDZ-311 titanate coupling agent, the consumption of NDZ-311 titanate coupling agent is the 1-2% of tree ash weight, adds in high speed mixer with Sprayable, discharging after stirring 15-20min, oven dry grinds to form 300-350 powder, obtains modification tree ash powder.
The Performance Detection of the powder metallurgical gear that the present embodiment obtains is as follows:
Tensile strength sigma b (MPa): 790
Yield strength σ s (MPa): 485
Percentage elongation δ 5 (%): 16.6
Contraction percentage of area ψ (%): 40.
Claims (3)
1. a powder metallurgy central gear, it is characterized in that, suppressed forming by the powder stock of following weight portion: iron powder 100, copper powder 1.8-2.0, molybdenum powder 0.5-0.8, vanadium powder 0.1-0.3, nickel powder 0.8-1.2, graphite powder 0.5-0.8, modification tree ash 0.1-0.3, rare earth ferrosilicon alloy 0.2-0.6, Cr powder 0.1-0.3, ethylene bis stearic acid amide 0.1-0.2, WS
20.1-0.3, yttrium powder 0.2-0.4, boron nitride 0.2-0.4, molybdenum sulfide 0.4-0.5, the trade mark of described rare earth ferrosilicon alloy is FeSiRE23, granularity 5-20mm; In described powder stock, the particle diameter of various metal dust is within the scope of 200-400 order.
2. the preparation method of powder metallurgy central gear as claimed in claim 1, is characterized in that, comprise the following steps:
(1) first the base-material iron powder of 40-50% is loaded in high-speed mixer, add the silane resin acceptor kh-550 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, vanadium powder, nickel powder, graphite powder, modification tree ash powder, Cr powder, ethylene bis stearic acid amide and remaining iron powder add wherein successively, mixed at high speed limit, limit is heated, when temperature is raised to 125-130 DEG C, again all the other components in formula are all added wherein, continue mixing 8-10 minute again, then it is allowed to cool, obtain the iron base powder mixture end of even density,
(2) iron base powder mixture end step (1) obtained loads in mould, makes shape at 550-580Mpa pressure;
(3) compressing green compact are placed in sintering furnace, in the protective atmosphere of hydrogen and nitrogen mixed gas, first at 1000 ~ 1050 DEG C of temperature, sintering 10-20 minute, then 1150-1180 DEG C is increased the temperature to the speed of 10-20 DEG C/min, at this temperature, reburn knot 10-15 minute, and then room temperature is down in cooling;
(4) the powder metallurgy central gear of heat treatment thermal sintering first carries out normalized treatment in normalizing furnace, is incubated 1-2 hours at 805 ~ 815 DEG C; Carry out Quenching Treatment again after taking-up, send in heat-treatment furnace and be heated to 650-700 DEG C, and be incubated 2-3 hour; Then, with quenching oil cooling, the powder metallurgy central gear after quenching is sent at being heated to 500-520 DEG C in tempering furnace and carry out high tempering process, insulation 1.5-2 hour, then carry out lonneal at 155 ~ 165 DEG C, insulation 2-3 hour;
(5) the powder metallurgy central gear after carburizing lonneal is sent in carburizer, is heated to 875-925 DEG C, isothermal holding 3-5 hour, is cooled to 120 DEG C in the carburizing medium of gaseous state, during insulation 5-8, and then cool to room temperature;
(6) the powder metallurgy central gear after steam treatment carburizing is sent in steam oven, and carry out steam treatment, vapor (steam) temperature 600-700 DEG C, isothermal holding time 3-4 hour, is then incubated 2-3 hour, finally naturally cools to room temperature at 200-250 DEG C.
3. the preparation method of powder metallurgy central gear according to claim 2, it is characterized in that, described modification tree ash powder is prepared from by the following method: tree ash is first used the salt acid soak 30-40 minute of 25%, then neutralize with alkali lye, use deionized water rinsing impurity elimination again, mix again and with the NDZ-311 titanate coupling agent of a small amount of ethanol dissolved dilution, the consumption of NDZ-311 titanate coupling agent is the 1-2% of tree ash weight, add in high speed mixer with Sprayable, discharging after stirring 15-20min, oven dry grinds to form 300-400 order powder, obtain modification tree ash powder.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104550914A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Iron-based self-lubrication powder metallurgy material for valve and preparation method of material |
| CN105772704A (en) * | 2016-03-16 | 2016-07-20 | 苏州莱特复合材料有限公司 | Ferrotungsten-based powder metallurgy material and preparation method thereof |
| CN106001548A (en) * | 2016-07-27 | 2016-10-12 | 黄宇 | Powder metallurgical gear |
| CN106041095A (en) * | 2016-07-27 | 2016-10-26 | 黄宇 | Novel powder metallurgical gear |
| CN108607997A (en) * | 2018-05-14 | 2018-10-02 | 洪新阳 | A kind of processing technology of gear |
| CN109128189B (en) * | 2018-07-16 | 2021-08-27 | 扬州海昌新材股份有限公司 | Manufacturing method of speed-regulating three-jaw inner gear ring |
| CN110614380B (en) * | 2019-10-09 | 2021-12-14 | 合肥工业大学 | Method for preparing high-uniformity molybdenum-tungsten-containing iron-based powder metallurgy part |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55134108A (en) * | 1979-04-06 | 1980-10-18 | Toyota Motor Corp | Production of gear by powder metallurgy |
| JPH11141461A (en) * | 1997-11-04 | 1999-05-25 | Mitsubishi Materials Corp | Manufacture of rotor for internal gear pump |
| CN1644280A (en) * | 2004-01-23 | 2005-07-27 | 杰富意钢铁株式会社 | Iron based powder for powder metallurgy |
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