CN102672176A - High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge - Google Patents
High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge Download PDFInfo
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- CN102672176A CN102672176A CN2012101602061A CN201210160206A CN102672176A CN 102672176 A CN102672176 A CN 102672176A CN 2012101602061 A CN2012101602061 A CN 2012101602061A CN 201210160206 A CN201210160206 A CN 201210160206A CN 102672176 A CN102672176 A CN 102672176A
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Abstract
The invention discloses a high-abrasion-resistance powder metallurgical spherical hinge for an excavating machine and a manufacture method of the spherical hinge. The manufacture method comprises the following steps of 1, uniform ingredient mixing, 2, warm-pressing one-step forming, 3, high-temperature sintering, 4, finishing, and 5, heat treatment. Through the material improvement and the step improvement, the goal of producing the spherical hinge by a powder metallurgy forming process is realized, and compared with mechanically processed parts, the spherical hinge produced by adopting the powder metallurgy forming process has the advantages that 55 percent of materials can be saved, and in addition, the abrasion resistance performance is improved by 20 percent.
Description
Technical field
The present invention relates to field of new.
Background technology
Powder metallurgy is a kind of material-saving, province's ability, of fine quality, inexpensive, pollution-free; The few nothing cutting, the efficient metal forming technology that are suitable for producing in enormous quantities have obtained extensive use in office machinerys such as automobile, motorcycle, household electrical appliance, electric tool, textile machine, duplicator.Along with the continuous development of PM technique, the application of powder metallurgy is also in continuous expansion.Because the engineering machinery working environment is more abominable, powder metallurgy is not used in this field as yet in batches.Ball pivot is as the critical component in the excavator steering control system; The manufacturing of ball pivot at present generally is the method that adopts machining (being processed through car, bore hole, pulling eye by bar), because ball pivot needs high-wearing feature, often intensity is bigger for the material that processing is adopted; And spherical hinge structure is complicated; It is big to process difficulty, and stock utilization is low, and processing cost is high; And the requirement that product strength that obtains with powder metallurgical technique in the market and wearability often do not reach ball pivot.For adapting to market demands, meet customer need, enlarge the application of powder metallurgy, promote Sustainable Development of Enterprises, excavator is tackled key problems as a project with the development of high-wear-resistant powder metallurgy ball pivot.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to above-mentioned prior art, and the manufacturing approach of a kind of that have high rigidity, a high-wearing feature and simple excavator of processing technology with ball pivot is provided.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is: a kind of excavator may further comprise the steps with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot:
The first step, batching are evenly mixed: the batching that will include alloy powder, lubricant, graphite powder and trace rare-earth is evenly mixed; Wherein the weight percent proportioning of alloy powder comprises: the Cu of 1.5-5.0%; The C of 0.2-0.8%; The Ni of 0.5-3.0%, the Mo of 1.0-2.0%, the CeO of 0.1-0.5%
2, surplus is Fe;
Second step, warm-pressing formation: adopt temperature and pressure once-forming technology, the above-mentioned batching that mixes is sent in the press hopper and through the temperature and pressure heater be heated to uniform temperature, get into again in the die cavity of mould and suppress;
The 3rd step, high temperature sintering: the pressed compact of above-mentioned press forming packed into carry out sintering in the sintering furnace;
The 4th step, finishing: the pressed compact behind the above-mentioned sintering is put into the finishing mold pressurization proofread and correct;
The 5th step, heat treatment: the pressed compact after the above-mentioned finishing is carried out carbo-nitriding earlier at a certain temperature, and oil cooling is carried out in the heat treatment that heats up again afterwards, again cleaning, tempering.
As the further improved technical scheme of the present invention, alloy powder described in the first step comprises that also weight proportion is the Mn of 0.05-0.3% and the P of 0.3-0.6%.
As the further improved technical scheme of the present invention, the weight percent proportioning of alloy powder described in the first step is: Cu is 2.5%, and C is 0.7%, and Ni is 1%, and Mo is 1.5%, CeO
2Be 0.2%, Mn is 0.2%, and P is 0.45%, and surplus is Fe.
As the further improved technical scheme of the present invention, preheat temperature is 750 ℃ described in the 3rd step, and positive sintering temperature is 1150 ℃.
As the further improved technical scheme of the present invention, the sintering furnace described in the 3rd step is a net strip sintering furnace, adopts hydrogen and nitrogen as protective atmosphere.
As the further improved technical scheme of the present invention, the heating-up temperature in second step during temperature and pressure is 130 ℃.
As the further improved technical scheme of the present invention, the temperature of carrying out carbo-nitriding in the 5th step is 820 ℃, and then temperature is risen to 860 ℃ heat-treats, and heat treatment period is 90 minutes.
And use the high-wear-resistant powder metallurgy ball pivot according to the excavator that top any one method obtains.
In batching, adding lubricant is to make powder be easy to flow, and improves apparent density, and die wear when reducing compacting is added Cu and played anti-corrosion effect, adds C, Mo and CeO
2Can improve ball pivot intensity and wearability graphite powder and trace rare-earth is in order to improve the physical and mechanical properties of sintering and heat treatment goods.
The Cu that the present invention adds in alloy powder plays anti-corrosion effect, the C of interpolation, Ni, Mo, CeO
2, Mn, P can improve ball pivot intensity and wearability; When compacting, adopt press forming technology of temperature and pressure.Through the temperature and pressure heater, powder is heated to 130 ℃, powder plasticity improves, and press power reduces, and can improve ball R density and uniformity everywhere like this, thereby further improve intensity, wearability and precision; Behind the product sintering, after heat-treating through the technology of carbo-nitriding, intensity, the wearability of basic material are further enhanced; Adopt powder metallurgy forming explained hereafter ball pivot of the present invention, and machined part: compare economical with materials 55% but process through car, bore hole, pulling eye, and wearability has improved 20% by bar.
The specific embodiment
Embodiment 1: this excavator may further comprise the steps with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot:
1) batching is evenly mixed: alloy powder and lubricant, graphite powder, trace rare-earth etc. are mixed, mix and adopt bicone numerical control batch mixer, manufacturer: the southern equipment manufacturing in Zhejiang, model: ZXS; Wherein the weight percent proportioning of alloy powder is: Cu 2.5%, and C 0.7%, and Ni 1%, and Mo 1.5%, CeO
20.2%, Mn0.2%, P 0.45%, and surplus is Fe.
2) warm-pressing formation: when compacting, adopt press forming technology of temperature and pressure.Send into the iron powder that mixes in the press hopper also through the temperature and pressure heater; Manufacturer: the prosperous brightness in Taiwan; Model QX-120 is heated to 130 ℃ with powder, again through suppressing automatically in the die cavity that adds powder box entering mould; 8 of the speed per minutes of compacting, and then through the rewinding dish product special use of packing into is put in the box.
3) high temperature sintering: adopt the program control sintering furnace of U.S. GASARRE, the pressed compact of press forming gets into the stainless steel guipure from charging aperture and carries, and needing the time by discharge hole for discharge is 4 hours; The electrical heating preheat temperature is 750 ℃; Positive sintering temperature is 1150 ℃, makes protection atmosphere with hydrogen and nitrogen in the burner hearth, and its purpose is the oxygen in the hydrogen reducing iron-base products; Nitrogen is made protection atmosphere usefulness, makes product not oxidized.
4) finishing: the pressed compact behind the sintering is put into the finishing mold pressurization so that size obtains proofreading and correct.The finishing lathe is a U.S. GASARRE 200T finishing machine, is furnished with high-precision floating type finishing mould bases, guarantees the shaping product uniformity of size, density, hardness up and down.Middle mould, core rod all adopt superhard material, the uniformity of assurance batch process size and size, form and position tolerance according with process requirements.
5) heat treatment: adopt the program control heat-treatment furnace of import Japan, model is RCL-600, at first will be placed on the pressed compact of expecting after the interior finishing of frame and under 820 ℃ temperature, the pressed compact after the finishing carried out carbo-nitriding; And then temperature risen to 860 ℃; 90 minutes time heat-treated, and carried out oil cooling afterwards, again cleaning, tempering; To eliminate heat treatment stress, enhance product performance.
Embodiment 2: present embodiment and embodiment 1 step are in full accord, and difference is that the weight percent proportioning of alloy powder is: Cu 1.5%, and C 0.2%, and Ni 0.5%, and Mo 1.0%, CeO
20.1%, Mn 0.05%, P0.3%, and surplus is Fe.
Embodiment 3: present embodiment and embodiment 1 step are in full accord, and difference is that the weight percent proportioning of alloy powder is: Cu 5%, and C 0.8%, and Ni 3.0%, and Mo 2.0%, CeO
20.5%, Mn 0.3%, P0.6%, and surplus is Fe.
Claims (8)
1. an excavator is characterized in that may further comprise the steps with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot:
The first step, batching are evenly mixed: the batching that will include alloy powder, lubricant, graphite powder and trace rare-earth is evenly mixed; Wherein the weight percent proportioning of alloy powder comprises: the Cu of 1.5-5.0%; The C of 0.2-0.8%; The Ni of 0.5-3.0%, the Mo of 1.0-2.0%, the CeO of 0.1-0.5%
2, surplus is Fe;
Second step, warm-pressing formation: adopt temperature and pressure once-forming technology, the above-mentioned batching that mixes is sent in the press hopper and through the temperature and pressure heater be heated to uniform temperature, get into again in the die cavity of mould and suppress;
The 3rd step, high temperature sintering: the pressed compact of above-mentioned press forming packed into carry out sintering in the sintering furnace;
The 4th step, finishing: the pressed compact behind the above-mentioned sintering is put into the finishing mold pressurization proofread and correct;
The 5th step, heat treatment: the pressed compact after the above-mentioned finishing is carried out carbo-nitriding earlier at a certain temperature, and oil cooling is carried out in the heat treatment that heats up again afterwards, again cleaning, tempering.
2. excavator according to claim 1 is characterized in that with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot: alloy powder described in the first step comprises that also weight proportion is the Mn of 0.05-0.3% and the P of 0.3-0.6%.
3. excavator according to claim 2 is characterized in that with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot: the weight percent proportioning of alloy powder described in the first step is: Cu is 2.5%, and C is 0.7%, and Ni is 1%, and Mo is 1.5%, CeO
2Be 0.2%, Mn is 0.2%, and P is 0.45%, and surplus is Fe.
4. excavator according to claim 4 is characterized in that with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot: said preheat temperature is 750 ℃, and positive sintering temperature is 1150 ℃.
5. excavator according to claim 1 is characterized in that with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot: the sintering furnace described in the 3rd step is a net strip sintering furnace, adopts hydrogen and nitrogen as protective atmosphere.
6. excavator according to claim 1 is characterized in that with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot: the heating-up temperature in second step during temperature and pressure is 130 ℃.
7. excavator according to claim 1 is with the manufacturing approach of high-wear-resistant powder metallurgy ball pivot; It is characterized in that: the temperature of carrying out carbo-nitriding in the 5th step is 820 ℃; And then temperature is risen to 860 ℃ heat-treat, heat treatment period is 90 minutes.
8. use the high-wear-resistant powder metallurgy ball pivot according to the excavator that each obtains in the claim 1 to 7.
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| CN2012101602061A CN102672176A (en) | 2012-05-23 | 2012-05-23 | High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge |
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| CN2012101602061A CN102672176A (en) | 2012-05-23 | 2012-05-23 | High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668316A (en) * | 2015-02-25 | 2015-06-03 | 成都易态科技有限公司 | Method and device for out-of-furnace straightening of sintered blank |
| CN107900324A (en) * | 2017-11-22 | 2018-04-13 | 温岭市恒丰粉末冶金有限公司 | A kind of duplex chain wheel processing technology |
| CN114054757A (en) * | 2021-11-16 | 2022-02-18 | 米巴精密零部件（中国）有限公司 | Powder metallurgy densification part and manufacturing process thereof |
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| JP2002020847A (en) * | 2000-05-11 | 2002-01-23 | Mitsubishi Materials Corp | CONNECTING ROD MADE OF Fe-BASED SINTERED ALLOY HAVING HIGH STRENGTH AND HIGH TOUGHNESS |
| CN1528547A (en) * | 2003-09-28 | 2004-09-15 | 海安县鹰球集团有限公司 | Powder metallurgy internal hilical gear, and its manufacturing method and die using same method |
| US20050274222A1 (en) * | 2004-06-10 | 2005-12-15 | Kuen-Shyang Hwang | Method for making sintered body with metal powder and sintered body prepared therefrom |
| CN101524757A (en) * | 2009-04-24 | 2009-09-09 | 马鞍山市华东粉末冶金厂 | Method for producing fly hammer seat by powder metallurgy |
| CN102433510A (en) * | 2011-12-08 | 2012-05-02 | 东南大学 | Iron-based powder metallurgy alloy with high strength and high toughness and preparation method thereof |
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2012
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Patent Citations (5)
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| JP2002020847A (en) * | 2000-05-11 | 2002-01-23 | Mitsubishi Materials Corp | CONNECTING ROD MADE OF Fe-BASED SINTERED ALLOY HAVING HIGH STRENGTH AND HIGH TOUGHNESS |
| CN1528547A (en) * | 2003-09-28 | 2004-09-15 | 海安县鹰球集团有限公司 | Powder metallurgy internal hilical gear, and its manufacturing method and die using same method |
| US20050274222A1 (en) * | 2004-06-10 | 2005-12-15 | Kuen-Shyang Hwang | Method for making sintered body with metal powder and sintered body prepared therefrom |
| CN101524757A (en) * | 2009-04-24 | 2009-09-09 | 马鞍山市华东粉末冶金厂 | Method for producing fly hammer seat by powder metallurgy |
| CN102433510A (en) * | 2011-12-08 | 2012-05-02 | 东南大学 | Iron-based powder metallurgy alloy with high strength and high toughness and preparation method thereof |
Cited By (3)
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| CN104668316A (en) * | 2015-02-25 | 2015-06-03 | 成都易态科技有限公司 | Method and device for out-of-furnace straightening of sintered blank |
| CN107900324A (en) * | 2017-11-22 | 2018-04-13 | 温岭市恒丰粉末冶金有限公司 | A kind of duplex chain wheel processing technology |
| CN114054757A (en) * | 2021-11-16 | 2022-02-18 | 米巴精密零部件（中国）有限公司 | Powder metallurgy densification part and manufacturing process thereof |
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Application publication date: 20120919 |