CN101249562A - Powder metallurgy prescription and technique - Google Patents
Powder metallurgy prescription and technique Download PDFInfo
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- CN101249562A CN101249562A CNA2008100609300A CN200810060930A CN101249562A CN 101249562 A CN101249562 A CN 101249562A CN A2008100609300 A CNA2008100609300 A CN A2008100609300A CN 200810060930 A CN200810060930 A CN 200810060930A CN 101249562 A CN101249562 A CN 101249562A
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Abstract
The invention discloses a metallurgic powder formulation and a process thereof. The metallurgic powder comprises graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. The process comprises the following steps of: mixing, pressing, sintering, soaking in oil, finishing, treating by steaming, and deburring. Compared with prior art, the metallurgic powder has low cost and reliable product performance by adopting the formulation: graphite powder 0.05% to 5%, zinc stearate 0.08% to 7%, copper powder 0.1% to 10%, and iron powder in balance. Moreover, the process is properly optimized and simplified, and the steam treatment step can form a dense protection film on the product surface to improve the rustproof performance.
Description
Technical field
The present invention relates to a kind of metallurgical technology, relate 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-integer-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 " (notification 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 relatively 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 solves the problems of the technologies described above the technical scheme that is adopted: a kind of powder metallurgy prescription and technology, evenly mix iron-based powder by graphite powder, zinc stearate, copper powder and iron powder, and, in the above-mentioned iron-based powder, be measurement unit by weight, graphite powder is 0.05% to 5%, and zinc stearate is 0.08% to 7%, copper powder is 0.1% to 10%, and iron powder is 73% to 99.77%; Its processing step contains: blend step, iron-based powder is evenly mixed by graphite powder, zinc stearate, copper powder and iron powder proportioning, and tinning is stand-by;
Pressing step: the iron-based powder of the tinning that mixes is sent into press, finish by press 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 the product blank into semi-finished articles according to the speed of setting;
Immersion oil step: will handle in semi-finished articles cooling and the immersion machine oil;
Finishing step: semi-finished articles is put into sizing die carry out fine correction, make semi-finished articles meet the requirements of the margin of tolerance;
Steam treatment step:, make the semi-finished articles surface form antirust coat with fine correction semi-finished articles steam treatment;
Deburring step: will have the antirust coat semi-finished articles through shot-peening, vibration and artificial deburring operation, and carry out deburring and handle.
For optimizing technique scheme, the technical measures of taking also comprise:
The time of above-mentioned sintering step is 2.5 hours to 5 hours; It is 600 ℃ to 900 ℃ that sintering step is used electrical heating preheating, preheat temperature earlier, and sintering temperature is 950 ℃ to 1300 ℃; Use H in the sintering furnace burner hearth
2And N
2Make protection gas.
The oil temperature of above-mentioned immersion oil step is 70 ℃ to 95 ℃; The time of immersion oil is 25 minutes to 50 minutes.
The temperature of above-mentioned 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, evenly mixes iron-based powder by graphite powder, zinc stearate, copper powder and iron powder, and, in the above-mentioned iron-based powder, be measurement unit by weight, graphite powder is 0.05% to 5%, and zinc stearate is 0.08% to 7%, copper powder is 0.1% to 10%, iron powder is 73% to 99.77% 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
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment:
Shown in Figure 1 is embodiment of the invention technological process signal, comprising:
Blend step: with steps of raw and auxiliary material proportioning, metering by weight, graphite powder is 0.05% to 5%, and zinc stearate is 0.08% to 7%, and copper powder is 0.1% to 10%, 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 1100 ℃, uses H in the burner hearth
2And N
2Make protection atmosphere, 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; be heated to 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, and oxygen is discharged to outdoor automatically, and nitrogen is used as protective gas through purifying.Powder metallurgy product obtains the material of certain intensity through oversintering, and hydrogen burns at two of stove.
Immersion oil step: 32# machine oil is poured in the bucket, be heated to 90 ℃, the product of immersion oil is put into wire basket with electrothermal tube, hang in the metal bucket that fills machine oil and heating, soak to hang out after 30 minutes and drain, pour new machine oil when machine oil is not enough again into, keep certain oil mass.
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 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.
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 takes out product and abrasive material separates then after 30 minutes, and artificial deburring is exactly with drilling machine the burr on the product aperture limit to be removed.
Most preferred embodiment of the present invention is illustrated, and various variations or the remodeling made by those of ordinary skills can not depart from the scope of the present invention.
Claims (4)
1. powder metallurgy prescription and technology, evenly mix iron-based powder by graphite powder, zinc stearate, copper powder and iron powder, it is characterized in that: in the described iron-based powder, be measurement unit by weight, described graphite powder is 0.05% to 5%, zinc stearate is 0.08% to 7%, and copper powder is 0.1% to 10%, and iron powder is 73% to 99.77%; Its processing step contains:
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 described product blank after will proofreading and correct is inserted the transmission guipure, transmits guipure and sends into sintering furnace according to the speed of setting, and sinters described product blank into semi-finished articles;
Immersion oil step: will handle in described semi-finished articles cooling and the immersion machine oil;
Finishing step: described semi-finished articles is put into sizing die carry out fine correction, make described semi-finished articles meet the requirements of the margin of tolerance;
Steam treatment step:, make described semi-finished articles surface form antirust coat with the described semi-finished articles steam treatment of fine correction;
Deburring step: will have the described semi-finished articles of antirust coat through shot-peening, vibration and artificial deburring operation, and carry out deburring and handle.
2. a kind of powder metallurgy prescription according to claim 1 and technology, feature is: the time of described sintering step is 2.5 hours 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.
3. a kind of powder metallurgy prescription according to claim 2 and technology, feature is: the oil temperature of described immersion oil step is 70 ℃ to 95 ℃; The time of immersion oil is 25 minutes to 50 minutes.
4. a kind of powder metallurgy prescription according to claim 3 and technology, feature is: 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100609300A CN101249562A (en) | 2008-03-26 | 2008-03-26 | Powder metallurgy prescription and technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100609300A CN101249562A (en) | 2008-03-26 | 2008-03-26 | Powder metallurgy prescription and technique |
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| CNA2008100609300A Pending CN101249562A (en) | 2008-03-26 | 2008-03-26 | Powder metallurgy prescription and technique |
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| CN101963123A (en) * | 2010-10-15 | 2011-02-02 | 苏州莱特复合材料有限公司 | Powder metallurgy hydraulic motor stator |
| CN102062149A (en) * | 2010-10-18 | 2011-05-18 | 浙江长盛滑动轴承有限公司 | High-performance iron-based powder metallurgy oil-containing self-lubricating bearing and production process thereof |
| CN102128207A (en) * | 2010-12-31 | 2011-07-20 | 山西东睦华晟粉末冶金有限公司 | Combination bearing for air condition compressor and manufacturing method thereof |
| CN102233425A (en) * | 2011-07-22 | 2011-11-09 | 浙江中平粉末冶金有限公司 | Powder metallurgy formula and process |
| CN102407333A (en) * | 2011-11-08 | 2012-04-11 | 益阳市俊淞汽车配件制造有限公司 | Powder metallurgy stator of car steering pump and production method thereof |
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| CN102581280A (en) * | 2011-01-14 | 2012-07-18 | 扬州海昌粉末冶金有限公司 | Back taper hole pressing process |
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2008
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| CN101963123A (en) * | 2010-10-15 | 2011-02-02 | 苏州莱特复合材料有限公司 | Powder metallurgy hydraulic motor stator |
| CN102062149A (en) * | 2010-10-18 | 2011-05-18 | 浙江长盛滑动轴承有限公司 | High-performance iron-based powder metallurgy oil-containing self-lubricating bearing and production process thereof |
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| CN107151757A (en) * | 2017-03-27 | 2017-09-12 | 刘金财 | A kind of preparation method of high-performance Fe-based powder metallurgy agglomerated material |
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| CN110640135A (en) * | 2019-09-30 | 2020-01-03 | 深圳市冠强粉末冶金制品有限公司 | Powder metallurgy process |
| CN110640135B (en) * | 2019-09-30 | 2021-09-21 | 深圳市冠强粉末冶金制品有限公司 | Powder metallurgy process |
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