CN1631581A - Method for improving cleanliness of powder metallurgy sintered blank - Google Patents
Method for improving cleanliness of powder metallurgy sintered blank Download PDFInfo
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- CN1631581A CN1631581A CN 200410093582 CN200410093582A CN1631581A CN 1631581 A CN1631581 A CN 1631581A CN 200410093582 CN200410093582 CN 200410093582 CN 200410093582 A CN200410093582 A CN 200410093582A CN 1631581 A CN1631581 A CN 1631581A
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Abstract
The invention relates to a technique increasing the powder metallurgy sintered adobe cleanliness which includes material mixing process, punching process, sintering process, shaping process and so on. The mixture ratio of the material powders is: iron powder taking 463.5 to 485 shares; copper powder taking 5 to 10 shares; nickel powder taking 5 to 10 shares; phosphor iron powder taking 5 to 15 shares; graphite powder taking 0 to 1.5 shares; micro powder paraffin taking 2.5 to 3.5 shares and 5 to 7 millesimal shares of the total weight. The micro powder totally gasified with nothing left as it is a complete organic constituent so that the surface cleanliness is greatly increased after sintering by adopting the technique moreover saving the man-power cost and improving the product quality by leaving out the processes to remove the surface black carbon.
Description
Technical field
The present invention relates to field of powder metallurgy, relate in particular to a kind of method that improves cleanliness of powder metallurgy sintered blank.
Background technology
PM technique is a kind of novel technology, and it has, and cost is low, efficient is high, complex-shaped, fewly do not have characteristics such as cutting, shows and has been widely used in every field such as automobile, motorcycle, household electrical appliance.Powder metallurgy is as primary raw material with metal dust, suitably add a certain proportion of auxiliary material, lubricant, mixing by certain hour, employed raw material when becoming compacting, raw material pass through the technical process that press forming and sintering produce metal material, composite and all kinds goods again.In process of production, we often find that the product surface behind some sintering has the carbon black precipitate of black, surface cleanness is poor, influence product appearance, in order to remove the carbon black of product surface, increased many labor costs again, surperficial uncleanly product is delivered to the complaint that the customers' place also will cause the client.
Lubricant---the zinc stearate [(C that uses during prior powder metallurgy is produced
17H
35COO)
2Zn] be a kind of unsettled acylate, the temperature that zinc stearate begins to decompose is about 350 ℃, and catabolite is H
2O, CO
2, ZnO, CmHn etc.High density and phosphorus content than high product in, the carbon in the zinc stearate thoroughly is not deposited in product surface and forms carbon black owing to decomposing in high temperature section, causes product surface unclean.
Summary of the invention
The object of the present invention is to provide a kind of method that improves cleanliness of powder metallurgy sintered blank, make the product surface cleaning.
The objective of the invention is to realize by following technical method: a kind of method that improves cleanliness of powder metallurgy sintered blank comprises the steps:
1) compounding process: be: with 463.5～485 parts of iron powders with proportioning; 5～10 parts of copper powders; 5～10 parts of nickel powders; 5～15 parts in ferrophosphorus powder; Graphite 0～～1.5 part; The material powder that micro mist wax is 2.5～3.5 parts mixes; Wherein micro mist wax accounts for 5 ‰ of gross weight～7 ‰;
2) suppression process: compacting makes the density of material powder reach 6.7～6.9g/cm
3
3) sintering circuit: the pressed compact sintering is put in sintering in the high temperature guipure electric furnace, and concrete parameter is: preheat temperature: 650 ℃ ± 50 ℃
Sintering temperature: 1.) 1135 ℃ ± 10 ℃
2.)1135℃±10℃
3.)1135℃±10℃
Guipure fltting speed: 5m/h;
Protective atmosphere: nitrogen: 40Nm
3/ h cracked ammonium: 1-3Nm
3/ h;
4) trimming: shaping makes part satisfy client's the dimensional requirement of using and assembling.
After adopting method of the present invention, the surface smoothness of product obviously improves, and has saved the step of removing surperficial carbon black, has saved human cost, has improved product quality.
The specific embodiment
The present invention adds micro mist wax as lubricant by adopting a kind of novel process in the mixed material powder, substitute lubricant---the zinc stearate that tradition is used, and improves the situation that product surface that product produces in sintering process pollutes.
Micro mist wax is a kind of hard and crisp LCFA diamides, in powder metallurgy, lubricant is except having good lubricating property, when also requiring in dewaxing process, to be heated to 600 ℃, from part, be gasified totally as far as possible, and do not have residue to stay in the sintering furnace, because it is a kind of organic principle completely, micro mist wax almost completely gasifies and does not stay residue, so can improve the surface cleanness behind the product sintering greatly.What adopt in the embodiment of the invention is the micro mist wax of German Hirst company, and model is W/W-SPECIAL, and its molecular formula is:
The proportioning of the material powder of using in the powder metallurgy process of the present invention is: with iron powder 463.5～485kg; Copper powder 5～10kg; Nickel powder 5～10kg; Ferrophosphorus powder 5～15kg; Graphite 0～～1.5kg; Micro mist wax 2.5～3.5kg, above-mentioned raw materials mixed 30 minutes in batch mixer in proportion.Wherein the weight of micro mist wax accounts for 5 ‰ of material powder gross weight～7 ‰.
| The ferrophosphorus powder | 10 | ?5 | ?15 | ?12 | ?14 |
| Graphite | 0.5 | ?0 | ?1.2 | ?1.5 | ?0.8 |
| Micro mist wax | 2.6 | ?3.5 | ?2.5 | ?3.4 | ?3.5 |
1) compounding process: guarantee that above-mentioned raw material mix, impurity must not be arranged, in order to avoid influence the performance of product.
2) suppression process: the density of the strict control of compacting part reaches 6.7～6.9g/cm
3, had not only guaranteed the requirement of strength of part but also can guarantee the final containing ratio of product, and strict control parts density is poor, otherwise easily cause the intensity of part or local strength on the low side.
3) sintering circuit: the pressed compact sintering is put in the high temperature guipure electric furnace, sintering: sintering on the guipure electric furnace, concrete parameter is: preheat temperature: 650 ℃ ± 50 ℃
Sintering temperature: 1.) 1135 ℃ ± 10 ℃
2.)1135℃±10℃
3.)1135℃±10℃
Fltting speed: 5m/h protective atmosphere: nitrogen: 40Nm
3/ h cracked ammonium: 1-3Nm
3/ h.
Sintered blank does not allow to produce oxidation, burning, underburnt, carbon distribution and generation bubble.
4) trimming: shaping is in order to make part satisfy client's the dimensional requirement of using and assembling, so strict control accessory size, especially fitted position and use size during shaping.
5) vibrator deburring operation: the product with the powder metallurgical technique technology is produced, all can have certain little burr at edge, can make the smooth no burr of product by vibrator deburring.
After adopting method of the present invention, the surface smoothness of product obviously improves, and has saved the step of removing surperficial carbon black, has saved human cost, has improved product quality.
Claims (6)
1. a method that improves cleanliness of powder metallurgy sintered blank comprises the steps:
1) compounding process: the micro mist wax of 5 ‰ of its gross weight～7 ‰ is arranged in the material powder, hand over material powder to mix;
2) suppression process: compacting makes the density of material powder reach 6.7～6.9g/cm
3;
3) sintering circuit: the pressed compact sintering is put in sintering in the high temperature guipure electric furnace, and concrete parameter is: preheat temperature: 650 ℃ ± 50 ℃
Sintering temperature: 1.) 1135 ℃ ± 10 ℃
2.)1135℃±10℃
3.)1135℃±10℃
4) trimming: shaping makes part satisfy client's the dimensional requirement of using and assembling.
2. the method for raising cleanliness of powder metallurgy sintered blank as claimed in claim 1 is characterized in that: guipure fltting speed: 5m/h in the sintering circuit.
3. the method for raising cleanliness of powder metallurgy sintered blank as claimed in claim 1 is characterized in that: protective atmosphere is in the sintering circuit: nitrogen: 40Nm
3/ h cracked ammonium: 1-3Nm
3/ h.
4. the method for raising cleanliness of powder metallurgy sintered blank as claimed in claim 1 is characterized in that: the proportioning of material powder is: with 463.5～485 parts of iron powders; 5～10 parts of copper powders; 5～10 parts of nickel powders; 5～15 parts in ferrophosphorus powder; Graphite 0～～1.5 part; 2.5～3.5 parts of micro mist waxes.
5. the method for raising cleanliness of powder metallurgy sintered blank as claimed in claim 1 is characterized in that: micro mist wax is:
Micro mist wax in powder metallurgical technique as the application of lubricant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093582 CN1631581A (en) | 2004-12-24 | 2004-12-24 | Method for improving cleanliness of powder metallurgy sintered blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410093582 CN1631581A (en) | 2004-12-24 | 2004-12-24 | Method for improving cleanliness of powder metallurgy sintered blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1631581A true CN1631581A (en) | 2005-06-29 |
Family
ID=34847755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410093582 Pending CN1631581A (en) | 2004-12-24 | 2004-12-24 | Method for improving cleanliness of powder metallurgy sintered blank |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462165C (en) * | 2006-08-08 | 2009-02-18 | 海门市常乐粉末冶金厂 | Manufacturing method and mold of powder metallurgy internal spiral ratchet |
| CN101920720A (en) * | 2010-09-09 | 2010-12-22 | 烟台东一粉末冶金制造有限公司 | Plunger body and manufacturing method thereof |
| CN102034585A (en) * | 2010-10-13 | 2011-04-27 | 莱州长和粉末冶金有限公司 | Iron core for engine cooling fan and manufacturing process thereof |
| CN102601354A (en) * | 2012-03-20 | 2012-07-25 | 常熟市双月机械有限公司 | Powder metallurgical material for pressing and sintering air intake seat ring |
| CN102605290A (en) * | 2012-03-20 | 2012-07-25 | 常熟市双月机械有限公司 | Powder metallurgy material used for pressing and sintering exhaust seat ring |
| EP2894210A4 (en) * | 2012-09-07 | 2016-03-23 | Federalnoe G Unitarnoe Predpr Goznak Fgup Goznak | Marking composition based on inorganic luminophores, method for marking metal items and metal item |
| CN106541125A (en) * | 2015-09-16 | 2017-03-29 | 龙口精益工贸有限公司 | Novel powder metallurgy material and preparation method thereof |
-
2004
- 2004-12-24 CN CN 200410093582 patent/CN1631581A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462165C (en) * | 2006-08-08 | 2009-02-18 | 海门市常乐粉末冶金厂 | Manufacturing method and mold of powder metallurgy internal spiral ratchet |
| CN101920720A (en) * | 2010-09-09 | 2010-12-22 | 烟台东一粉末冶金制造有限公司 | Plunger body and manufacturing method thereof |
| CN101920720B (en) * | 2010-09-09 | 2013-07-10 | 烟台东一粉末冶金制造有限公司 | Plunger body and manufacturing method thereof |
| CN102034585A (en) * | 2010-10-13 | 2011-04-27 | 莱州长和粉末冶金有限公司 | Iron core for engine cooling fan and manufacturing process thereof |
| CN102034585B (en) * | 2010-10-13 | 2012-10-17 | 莱州长和粉末冶金有限公司 | Iron core for engine cooling fan and manufacturing process thereof |
| CN102601354A (en) * | 2012-03-20 | 2012-07-25 | 常熟市双月机械有限公司 | Powder metallurgical material for pressing and sintering air intake seat ring |
| CN102605290A (en) * | 2012-03-20 | 2012-07-25 | 常熟市双月机械有限公司 | Powder metallurgy material used for pressing and sintering exhaust seat ring |
| EP2894210A4 (en) * | 2012-09-07 | 2016-03-23 | Federalnoe G Unitarnoe Predpr Goznak Fgup Goznak | Marking composition based on inorganic luminophores, method for marking metal items and metal item |
| CN106541125A (en) * | 2015-09-16 | 2017-03-29 | 龙口精益工贸有限公司 | Novel powder metallurgy material and preparation method thereof |
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