CN102233425A - Powder metallurgy formula and process - Google Patents
Powder metallurgy formula and process Download PDFInfo
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- CN102233425A CN102233425A CN2011102074260A CN201110207426A CN102233425A CN 102233425 A CN102233425 A CN 102233425A CN 2011102074260 A CN2011102074260 A CN 2011102074260A CN 201110207426 A CN201110207426 A CN 201110207426A CN 102233425 A CN102233425 A CN 102233425A
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Abstract
The invention discloses a powder metallurgy formula and process. The raw material powder comprises the following components by weight percentage: 0.2%-1.5% of graphite powder, 0.5%-1.3% of zinc stearate, 0.5%-3% of copper powder and the balance of iron powder. The process comprises the following steps: mixing; pressing; sintering; finishing; de-burring; and performing steam treatment. Compared with the prior art, the process provided by the invention has the advantages that by adopting the raw material proportioning mode, the obtained finished product has low cost and reliable performances; the processing steps are properly optimized, thus simplifying the process; and a compact protective film is formed on the surface of the product in the steam treatment procedure, thus improving rust resistance.
Description
Technical field
A kind of metallurgical technology of the present invention relates in particular to a kind of powder metallurgy prescription and technology.
Background technology
How the powder metallurgical technique that is adopted on the mass society is through batch mixing-stirring-moulding-sintering-shaping-double sintering-machining-heat treatment-operations such as vibration grinding-vacuum oil immersion.Because country more and more payes attention to environmental protection, in mechanical industry, simplify processing step and can save a lot of energy.But also have in order to improve the high efficiency of batch process, simplify the mode of prescription, minimizing processing step as employing, the efficient of its manufacturing just can improve greatly so, " weldable sintered metal powder bearing and production technology " (public number is CN1851280A) as application number 200610051686.2 is exactly this type of design, in order to achieve the above object, a kind of weldable sintered metal powder bearing that this invention is designed, its dusty material is formed and is comprised 100 parts of iron powders, and it also comprises 0.5 to 1.2 part of graphite powder, 0.4 to 0.5 part in curing aluminium, 0.5 to 3 part of copper powder.In forming, dusty material also includes 0.08 part in machine oil.In order to improve self-lubricating property and to guarantee that bearing is indeformable under HTHP, in forming, dusty material also includes the zinc stearate below 0.8 part.For the wearability that guarantees bearing and improve its solderability, the phosphorus content in the bearing completed products is percent nought point four.And adopt the method for press-molding to produce product.Yet its prescription and manufacturing process still have limitation, and be poor to the special process demand adaptation.
Summary of the invention
Technical problem to be solved by this invention is the present situation at prior art, and quality height, the technology cost is low, production efficiency is high, applied widely a kind of powder metallurgy prescription and technology are provided.
The present invention addresses the above problem the technical scheme that is adopted: a kind of powder metallurgy prescription, evenly mix iron-based powder by graphite powder, zinc stearate, copper powder and iron powder, in the described iron-based powder, parts by weights is a measurement unit, described graphite powder is 0.2% to 1.5%, zinc stearate is 0.5% to 1.3%, and copper powder is 0.5% to 3%, and iron powder is 95.2% to 98.8%.
Among the present invention, described graphite powder is 0.2%, and zinc stearate is 1.3%, and copper powder is 0.5%, and iron powder is 98%.
Among the present invention, described graphite powder is 1.5%, and zinc stearate is 1.3%, and copper powder is 3%, and iron powder is 94.2%.
Among the present invention, described graphite powder is 1%, and zinc stearate is 1%, and copper powder is 2.8%, and iron powder is 95.2%.
Among the present invention, described graphite powder is 0.2%, and zinc stearate is 0.5%, and copper powder is 0.5%, and iron powder is 98.8%.
The present invention also discloses a kind of technology of powder metallurgy prescription simultaneously, and its processing step comprises:
Blend step described iron-based powder is evenly mixed by described graphite powder, zinc stearate, copper powder and iron powder proportioning, and tinning is stand-by;
Pressing step: the described iron-based powder of the tinning that mixes is sent into press, finish by press described iron-based powder is sent into default product mold, and be pressed into the product blank;
Sintering step: the product blank is inserted the transmission guipure, transmit guipure and send into sintering furnace, sinter described product blank into semi-finished articles according to the speed of setting;
Finishing step: described semi-finished articles is put into shaping mould carry out fine correction, make described semi-finished articles meet the requirements of the margin of tolerance;
Deburring step: orthopedic semi-finished articles through shot-peening deburring operation, is carried out deburring and handles;
Steam treatment step:, make described semi-finished articles surface form compacted zone with described semi-finished articles steam treatment after the deburring.
Among the present invention, the time of described sintering step is 2.5 to 5 hours; It is 600 ℃ to 900 ℃ that described sintering step is used electrical heating preheating, preheat temperature earlier, and sintering temperature is 950 ℃ to 1300 ℃; Use H in the described sintering furnace burner hearth
2And N
2Make protection gas.
Among the present invention, the temperature of described steam treatment step is 500 ℃ to 800 ℃, and the processing time is 3.5 hours to 5 hours.
Compared with prior art, the present invention has adopted a kind of powder metallurgy prescription and technology, and close by the even temperature of graphite powder, zinc stearate, copper powder and iron powder and form iron-based powder, and, in the above-mentioned iron-based powder, be measurement unit by weight, graphite powder is 0.2% to 1.5%, and zinc stearate is 0.5% to 1.3%, copper powder is 0.5% to 3%, iron powder is 95.2% to 98.8% proportioning mode, and is with low cost, and end properties is reliable, applied widely.And processing step has passed through suitable optimization, has simplified technology, the cost performance height; The operation of steam treatment can form compact protective film at product surface, improves antirust performance.
Description of drawings
Fig. 1 is an embodiment of the invention process flow diagram.
The specific embodiment
Further understand and understanding for making architectural feature of the present invention and the effect reached had, cooperate detailed explanation, be described as follows in order to preferred embodiment and accompanying drawing:
Embodiment:
Shown in Figure 1 is embodiment of the invention technological process signal, comprising:
Blend step: with former shop material mixture ratio, metering by weight, graphite powder is 0.2% to 1.5%, and zinc stearate is 0.5% to 1.3%, and copper powder is 0.5% to 3%, and all the other mix for the proportioning of iron powder.
Pressing step: the iron powder that mixes is sent into press top, and by suppressing automatically in the die cavity that adds powder box adding mould, 8 of the speed per minutes of compacting are delivered in the rotating disk with manipulator then.
Sintering step: the net strip sintering furnace sintering, enter with the conveying of stainless steel guipure from charging aperture, needing the time by discharge hole for discharge is 4 hours, is 730 ℃ with the electrical heating preheat temperature, sintering temperature is 1110 ℃, uses H in the burner hearth
2And N
2Make protection gas, its purpose is H
2Oxygen in the reduced iron base product, N
2Make protection atmosphere usefulness, make product not oxidized, H
2Making be raw material with liquefied ammonia; heat 800 ℃ under the effect of nickel accelerant; be decomposed into 75% hydrogen and 25% nitrogen; the making of nitrogen is to be raw material with compressed air; adsorb by carbon molecular sieve, air separation is become nitrogen and oxygen, oxygen is discharged to outdoor automatically; nitrogen is through purifying, as protective gas.The powder metallurgy product obtain the material of certain intensity through oversintering, and hydrogen burns at two of stove.
Finishing step: distortion is to a certain degree arranged behind the demanding product sintering, need to guarantee form and position tolerance that shaping device is the hydraulic press of 200 tons or 100 tons, and sizing die frame is arranged on the press by shaping, product is put into sizing die and is proofreaied and correct, thereby makes product reach the requirement margin of tolerance.
The deburring step: comprise shot-peening, vibration, artificial deburring, the shot-peening deburring is exactly product to be poured in the sand-blasting machine spray to product with stainless shot with certain jet velocity, and product burr on rolling product on the rubber strip sprays.Vibrator deburring is poured the product of some and a certain proportion of abrasive material jointly in the vibration trough and to be vibrated, and through taking out product and abrasive material after 30 minutes separately, artificial deburring is exactly with drilling machine the burr on the product aperture limit to be removed.
The steam treatment step: product is put into the iron basket, hangs in the steam treatment stove, is heated to 700 ℃ with resistance wire, be incubated 5 hours, feed oversaturated water vapour, iron and water vapour react, and generate tri-iron tetroxide and hydrogen, hydrogen ignites by escape pipe, product surface densification after the steam treatment is difficult for getting rusty, and can't leak gas, and water vapour has special water vapour producer supply, automatically add the water insulation of cutting off the electricity supply automatically behind the certain pressure, simple to operate.
In above-mentioned, can also adopt following preferred embodiment about powder metallurgy prescription of the present invention:
Embodiment 1: power formulations of the present invention is as follows: in iron-based powder, parts by weights is a measurement unit, and graphite powder is 0.2%, and zinc stearate is 1.3%, and copper powder is 0.5%, and iron powder is 98%.Have equally with low cost, advantage such as end properties is reliable, applied widely.
Embodiment 2: power formulations of the present invention is as follows: in iron-based powder, parts by weights is a measurement unit, and graphite powder is 1.5%, and zinc stearate is 1.3%, and copper powder is 3%, and iron powder is 94.2%.Have equally with low cost, advantage such as end properties is reliable, applied widely.
Embodiment 3: power formulations of the present invention is as follows: in iron-based powder, parts by weights is a measurement unit, and graphite powder is 1%, and zinc stearate is 1%, and copper powder is 2.8%, and iron powder is 95.2%.Have equally with low cost, advantage such as end properties is reliable, applied widely.
Embodiment 4: power formulations of the present invention is as follows: in iron-based powder, parts by weights is a measurement unit, and graphite powder is 0.2%, and zinc stearate is 0.5%, and copper powder is 0.5%, and iron powder is 98.8%.Have equally with low cost, advantage such as end properties is reliable, applied widely.
Certainly, according to actual needs, power formulations of the present invention can also comprise more embodiment in above-mentioned scope, and the present invention is not limited to above-mentioned specific embodiment.
In sum, it only is preferred embodiment of the present invention, be not to be used for limiting scope of the invention process, all equalizations of doing according to the described shape of claim scope of the present invention, structure, feature and spirit change and modify, and all should be included in the claim scope of the present invention.
Claims (8)
1. powder metallurgy prescription, it is characterized in that, evenly mix iron-based powder by graphite powder, zinc stearate, copper powder and iron powder, in the described iron-based powder, parts by weights is a measurement unit, and described graphite powder is 0.2% to 1.5%, and zinc stearate is 0.5% to 1.3%, copper powder is 0.5% to 3%, and iron powder is 95.2% to 98.8%.
2. powder metallurgy prescription according to claim 1 is characterized in that, described graphite powder is 0.2%, and zinc stearate is 1.3%, and copper powder is 0.5%, and iron powder is 98%.
3. powder metallurgy prescription according to claim 1 is characterized in that, described graphite powder is 1.5%, and zinc stearate is 1.3%, and copper powder is 3%, and iron powder is 94.2%.
4. powder metallurgy prescription according to claim 1 is characterized in that, described graphite powder is 1%, and zinc stearate is 1%, and copper powder is 2.8%, and iron powder is 95.2%.
5. powder metallurgy prescription according to claim 1 is characterized in that, described graphite powder is 0.2%, and zinc stearate is 0.5%, and copper powder is 0.5%, and iron powder is 98.8%.
6. technology based on each described powder metallurgy prescription of claim 1 to 5, its processing step comprises:
Blend step described iron-based powder is evenly mixed by described graphite powder, zinc stearate, copper powder and iron powder proportioning, and tinning is stand-by;
Pressing step: the described iron-based powder of the tinning that mixes is sent into press, finish by press described iron-based powder is sent into default product mold, and be pressed into the product blank;
Sintering step: the product blank is inserted the transmission guipure, transmit guipure and send into sintering furnace, sinter described product blank into semi-finished articles according to the speed of setting;
Finishing step: described semi-finished articles is put into shaping mould carry out fine correction, make described semi-finished articles meet the requirements of the margin of tolerance;
Deburring step: orthopedic semi-finished articles through shot-peening deburring operation, is carried out deburring and handles;
Steam treatment step:, make described semi-finished articles surface form compacted zone with described semi-finished articles steam treatment after the deburring.
7. the technology of powder metallurgy prescription according to claim 6 is characterized in that, the time of described sintering step is 2.5 to 5 hours; It is 600 ℃ to 900 ℃ that described sintering step is used electrical heating preheating, preheat temperature earlier, and sintering temperature is 950 ℃ to 1300 ℃; Use H in the described sintering furnace burner hearth
2And N
2Make protection gas.
8. the technology of powder metallurgy prescription according to claim 7 is characterized in that, the temperature of described steam treatment step is 500 ℃ to 800 ℃, and the processing time is 3.5 hours to 5 hours.
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| CN2011102074260A CN102233425A (en) | 2011-07-22 | 2011-07-22 | Powder metallurgy formula and process |
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| CN102528040A (en) * | 2012-02-24 | 2012-07-04 | 王兴民 | Process method for manufacturing balance weight for compressor by powder metallurgy |
| CN102689013A (en) * | 2012-06-06 | 2012-09-26 | 海安县鹰球集团有限公司 | High-toughness oil-retaining bearing for iron-base power metallurgy and manufacturing method thereof |
| CN102717082A (en) * | 2012-05-23 | 2012-10-10 | 马鞍山市华东粉末冶金厂 | Method for producing water pump half coupler by powder metallurgy |
| CN102921943A (en) * | 2012-10-30 | 2013-02-13 | 南通金巨霸机械有限公司 | Powder metallurgy mechanical part production process |
| CN103223487A (en) * | 2013-04-09 | 2013-07-31 | 吴建平 | Method for manufacturing automobile connecting rod through powder metallurgy |
| CN103223486A (en) * | 2013-03-30 | 2013-07-31 | 安徽省恒宇粉末冶金有限公司 | Powder metallurgy duplicate gear and preparation method thereof |
| CN103223490A (en) * | 2013-04-09 | 2013-07-31 | 吴建平 | Method for manufacturing motorcycle crank shaft through powder metallurgy |
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| CN102528040B (en) * | 2012-02-24 | 2013-11-13 | 王兴民 | Process method for manufacturing balance weight for compressor by powder metallurgy |
| CN102528040A (en) * | 2012-02-24 | 2012-07-04 | 王兴民 | Process method for manufacturing balance weight for compressor by powder metallurgy |
| CN102717082A (en) * | 2012-05-23 | 2012-10-10 | 马鞍山市华东粉末冶金厂 | Method for producing water pump half coupler by powder metallurgy |
| CN102689013A (en) * | 2012-06-06 | 2012-09-26 | 海安县鹰球集团有限公司 | High-toughness oil-retaining bearing for iron-base power metallurgy and manufacturing method thereof |
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| CN104550922A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Powder metallurgy material for high-finish-degree valve and preparation method of powder metallurgy material |
| CN104550908A (en) * | 2014-12-25 | 2015-04-29 | 铜陵市经纬流体科技有限公司 | Cracking-resistant iron-base powder metallurgy material used for valve and preparation method of cracking-resistant iron-base powder metallurgy material |
| CN105478773A (en) * | 2015-11-25 | 2016-04-13 | 芜湖市鸿坤汽车零部件有限公司 | Method for preparing automobile hub bolt bypowder metallurgy process |
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| CN105499588A (en) * | 2015-12-09 | 2016-04-20 | 碧梦技(上海）复合材料有限公司 | Powder metallurgy manufacturing technology of synchronizer gear hub |
| CN109332678A (en) * | 2018-11-27 | 2019-02-15 | 沈劲松 | One kind being used for mining machinery powder metallurgy prescription |
| CN112453387A (en) * | 2020-11-27 | 2021-03-09 | 深圳市日东科技发展有限公司 | Powder metallurgy-based high-density stainless steel product formula and process thereof |
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Application publication date: 20111109 |