CN103231061B - Powder metallurgy synchronous wheel and preparation method thereof - Google Patents
Powder metallurgy synchronous wheel and preparation method thereof Download PDFInfo
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Abstract
The invention provides a powder metallurgy synchronous wheel which is formed by compressing the following power stocks in part by weight: 100 parts of iron powder, 1.8 to 2.0 parts of copper powder, 0.5 to 0.8 part of molybdenum powder, 0.1 to 0.3 part of tungsten powder,0.8 to 1.2 part of nickel powder, 0.5 to 0.8 part of graphite powder, 0.1 to 0.3 part of modified wood ash, 0.2 to 0.6 part of lithium stearate, 0.1 to 0.3 part of zinc stearate, 0.1 to 0.2 part of ethylene bis stearamide, 0.1 to 0.3 part of molybdenum disulfide, 0.2 to 0.4 part of aluminium oxide,0.2 to 0.4 part of calcium fluoride and 0.4 to 0.5 part of liF. When in preparation, mixing the powder stocks stepwise firstly, and obtaining the finished product synchronous wheel through compressing and manufacturing, sintering, heat treatment and surface treatment. The produced powder metallurgy synchronous wheel has the advantages that the synchronous wheel is good in abrasion resistance, high in strength and rigidity, good in machinability, is corrosion resistant and less susceptible to breakage, and has a long service life.
Description
Technical field
The present invention relates to field of powder metallurgy, be specifically related to a kind of powder metallurgy synchronizing wheel 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, zinc stearate 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 synchronizing wheel and preparation method thereof, by the technique of special pulp furnish and science, produce powder metallurgy synchronizing wheel 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 synchronizing wheel, 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, tungsten powder 0.1-0.3, nickel powder 0.8-1.2, graphite powder 0.5-0.8, modification tree ash 0.1-0.3, lithium stearate 0.2-0.6, zinc stearate 0.1-0.3, ethylene bis stearic acid amide 0.1-0.2, molybdenum bisuphide 0.1-0.3, alundum (Al2O3) 0.2-0.4, calcirm-fluoride 0.2-0.4, LiF 0.4-0.5.
The preparation method of described powder metallurgy synchronizing wheel, 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 coupler KH-560 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, tungsten powder, nickel powder, graphite powder, modification tree ash powder, zinc stearate, 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 130-135 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 1115 ~ 1125 DEG C in temperature, sintering time is 10-20 minute, then increase the temperature to 1250-1300 DEG C with the speed of 10-20 DEG C/min, at this temperature, reburn knot 10-15 minute, then room temperature is down in cooling, is carrying out fine finishining;
(4) carry out Quenching Treatment again after heat treatment fine finishining, hardening heat is 825 ~ 835 DEG C, cool time 2-3 hour; Then at 540-550 DEG C, high tempering process is carried out, insulation 1.5-2 hour; Then lonneal is carried out at 155 ~ 165 DEG C, 2-3 hour;
(5) gas nitriding, the powder metallurgy synchronizing wheel after lonneal oozes 50 minutes altogether under 700 DEG C of blanket of nitrogen in atmosphere controlled heat treatment furnace, is cooled to 120 DEG C, insulation 5-8 hour, then cool to room temperature;
(6) the powder metallurgy synchronizing wheel after Darkening process nitriding carries out Darkening process 3-5 minute, then takes out.
Described powder metallurgy synchronizing wheel, 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 synchronizing wheel, 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 synchronizing wheel 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 synchronizing wheel, 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 synchronizing wheel of the present invention, adds the metal dust of different proportion in composition of raw materials, makes the synchronizing wheel 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 tungsten 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, tungsten powder 0.2, nickel powder 1.0, graphite powder 0.7, modification tree ash 0.2, lithium stearate 0.5, zinc stearate 0.2, ethylene bis stearic acid amide 0.15, molybdenum bisuphide 0.2, alundum (Al2O3) 0.3, calcirm-fluoride 0.3, LiF 0.45
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 coupler KH-560 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, tungsten powder, nickel powder, graphite powder, modification tree ash powder, zinc stearate, 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 130-135 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 1115 ~ 1125 DEG C in temperature, sintering time is 10-20 minute, then increase the temperature to 1250-1300 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) carry out Quenching Treatment again after heat treatment fine finishining, hardening heat is 825 ~ 835 DEG C, cool time 2-3 hour; Then at 540-550 DEG C, high tempering process is carried out, insulation 1.5-2 hour; Then lonneal is carried out at 155 ~ 165 DEG C, 2-3 hour;
(5) gas nitriding, the powder metallurgy synchronizing wheel after lonneal oozes 50 minutes altogether under 700 DEG C of blanket of nitrogen in atmosphere controlled heat treatment furnace, is cooled to 120 DEG C, during insulation 5-8, then cool to room temperature;
(6) the powder metallurgy synchronizing wheel after Darkening process nitriding carries out Darkening process 3-5 minute, then takes out.
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): 810
Yield strength σ s (MPa): 548
Percentage elongation δ 5 (%): 13.6
Contraction percentage of area ψ (%): 38.
Claims (4)
1. a powder metallurgy synchronizing wheel, 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, tungsten powder 0.1-0.3, nickel powder 0.8-1.2, graphite powder 0.5-0.8, modification tree ash 0.1-0.3, lithium stearate 0.2-0.6, zinc stearate 0.1-0.3, ethylene bis stearic acid amide 0.1-0.2, molybdenum bisuphide 0.1-0.3, alundum (Al2O3) 0.2-0.4, calcirm-fluoride 0.2-0.4, LiF0.4-0.5.
2. the preparation method of powder metallurgy synchronizing wheel 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 coupler KH-560 of base-material iron powder quality 0.3-0.6% wherein, high-speed stirred 5-6 minute, then by copper powder, molybdenum powder, tungsten powder, nickel powder, graphite powder, modification tree ash powder, lithium stearate, zinc stearate, 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 130-135 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 1115 ~ 1125 DEG C of temperature, sintering 10-20 minute, then increase the temperature to 1250-1300 DEG C with the speed of 10-20 DEG C/min, at this temperature, reburn knot 10-15 minute, then room temperature is down in cooling, is carrying out fine finishining;
(4) carry out Quenching Treatment again after heat treatment fine finishining, hardening heat is 825 ~ 835 DEG C, cool time 2-3 hour; Then at 540-550 DEG C, high tempering process is carried out, insulation 1.5-2 hour; Then lonneal is carried out at 155 ~ 165 DEG C, 2-3 hour;
(5) gas nitriding, the powder metallurgy synchronizing wheel after lonneal oozes 50 minutes altogether under 700 DEG C of blanket of nitrogen in atmosphere controlled heat treatment furnace, is cooled to 120 DEG C, during insulation 5-8, then cool to room temperature;
(6) the powder metallurgy synchronizing wheel after Darkening process nitriding carries out Darkening process 3-5 minute, then takes out.
3. powder metallurgy synchronizing wheel according to claim 1, is characterized in that, in described powder stock, the particle diameter of various metal dust is within the scope of 200-400 order.
4. the preparation method of powder metallurgy synchronizing wheel 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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| CN104455321A (en) * | 2013-09-17 | 2015-03-25 | 湖北永土科技股份有限公司 | Automotive brake clearance automatic adjusting arm left and right rack |
| CN103602900B (en) * | 2013-10-10 | 2016-03-09 | 铜陵新创流体科技有限公司 | A kind of Powder metallurgy flange and preparation method thereof |
| CN103602902B (en) * | 2013-10-10 | 2016-03-09 | 铜陵新创流体科技有限公司 | A kind of Powder metallurgy pressure-resistant composite metal material and preparation method thereof |
| CN104028765B (en) * | 2014-06-27 | 2016-01-20 | 张家港振江粉末冶金制品有限公司 | A kind of production method of the metallic sintered products with installation through hole |
| DE102015112322A1 (en) * | 2015-07-28 | 2017-02-02 | Hoerbiger Antriebstechnik Holding Gmbh | Method for producing a synchronizer ring and synchronizer ring |
| CN105149595A (en) * | 2015-08-28 | 2015-12-16 | 苏州莱特复合材料有限公司 | Powder metallurgy shaft sleeve and manufacturing method thereof |
| CN109128190A (en) * | 2018-10-15 | 2019-01-04 | 常熟市迅达粉末冶金有限公司 | A kind of helical gear processing technology of thin-walled |
| CN111872371B (en) * | 2020-07-28 | 2022-02-18 | 青志(无锡)粉末铸锻有限公司 | Production process of clamping jaw for woodworking machine |
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| CN102179519A (en) * | 2011-03-09 | 2011-09-14 | 宁波甬台粉末冶金有限公司 | Powder metallurgy transmission gear and manufacturing method thereof |
| CN102982946A (en) * | 2012-11-23 | 2013-03-20 | 天长市昭田磁电科技有限公司 | La2O3-containing ferromagnetic core manufacturing method |
| CN102990065A (en) * | 2012-11-25 | 2013-03-27 | 安徽普源分离机械制造有限公司 | Powder metallurgy manufacturing method for valve flap of check valve |
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| JPH06330214A (en) * | 1993-05-21 | 1994-11-29 | Sumitomo Electric Ind Ltd | Aluminum power alloy having high hardness and wear resistnce and its production |
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| CN102179519A (en) * | 2011-03-09 | 2011-09-14 | 宁波甬台粉末冶金有限公司 | Powder metallurgy transmission gear and manufacturing method thereof |
| CN102982946A (en) * | 2012-11-23 | 2013-03-20 | 天长市昭田磁电科技有限公司 | La2O3-containing ferromagnetic core manufacturing method |
| CN102990065A (en) * | 2012-11-25 | 2013-03-27 | 安徽普源分离机械制造有限公司 | Powder metallurgy manufacturing method for valve flap of check valve |
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Address after: The new town 241000 Anhui city of Wuhu province Fanchang County of Curry Village Patentee after: Anhui Hengjun Powder Metallurgy Technology Co., Ltd. Address before: The new town 241202 Anhui city of Wuhu province Fanchang County of Curry Village Patentee before: Anhui Hengyu Powder Metallurgy Co., Ltd. |