CN107900324A - A kind of duplex chain wheel processing technology - Google Patents

A kind of duplex chain wheel processing technology Download PDF

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Publication number
CN107900324A
CN107900324A CN201711171918.2A CN201711171918A CN107900324A CN 107900324 A CN107900324 A CN 107900324A CN 201711171918 A CN201711171918 A CN 201711171918A CN 107900324 A CN107900324 A CN 107900324A
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China
Prior art keywords
pressed compact
chain wheel
duplex chain
powder
processing technology
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CN201711171918.2A
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Inventor
郑玉平
郑彦彬
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WENLING HENGFENG POWDER METALLURGY Co Ltd
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WENLING HENGFENG POWDER METALLURGY Co Ltd
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Priority to CN201711171918.2A priority Critical patent/CN107900324A/en
Publication of CN107900324A publication Critical patent/CN107900324A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/241—Chemical after-treatment on the surface
    • B22F2003/242—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Abstract

The present invention provides a kind of duplex chain wheel processing technology, belong to field of mechanical technique.It solves the problems, such as that existing duplex chain wheel intensity is bad.This duplex chain wheel processing technology comprises the following steps：A, batch mixing；B, compression molding；C, annular groove is processed；D, sinter；E, it is heat-treated；F, oil quenching；G, cool down；H, it is tempered；I, vacuum cleaned；J, hole seals.This duplex chain wheel processing technology has the advantages that sprocket wheel intensity can be improved.

Description

A kind of duplex chain wheel processing technology
Technical field
The invention belongs to field of mechanical technique, is related to a kind of duplex chain wheel, particularly a kind of duplex chain wheel processing technology.
Background technology
Duplex chain wheel, refers to there is the sprocket wheel of the double gear teeth.Existing duplex chain wheel is produced by powder metallurgy process , but the product and production technology produced have following deficiency：
1st, cold-press moulding, pressed density is low, 6.8~7.0g/cm of density3.Material property does not reach requirement, intensity difference, list Tooth tooth resist low, shock resistance is poor, it is easy generation collapse tooth problem.
2nd, warm-pressing formation, pressed density can be pressed onto 7.2~7.3g/cm3, material property reaches requirement, but green strength Difference, it is impossible to process.
3rd, it is big to machine sintered blank difficulty of processing, takes cutter, efficiency is very low, high processing costs, and in sprocket after processing Burr is also easy to produce at tooth form, goes that sprocket profile accuracy can be destroyed during flash removed.
4th, unused hole sealing agent sealing of hole before zinc electroplating with iridescent yellow chromate conversion coating, the electroplate liquid after zinc electroplating with iridescent yellow chromate conversion coating in product hole easily ooze out, and tint is not Unanimously, presentation quality is poor, easily gets rusty.
The content of the invention
The purpose of the present invention is for existing technology, there are the above problem, it is proposed that a kind of duplex chain wheel processing technology, The technical problem of solution is how to improve intensity, toughness and while production efficiency, and reduces cost.
The purpose of the present invention can be realized by following technical proposal：A kind of duplex chain wheel processing technology, it is characterised in that Duplex chain wheel is made by the raw material of following mass percent：Iron powder 92~94, copper powder 2.5~2.8, manganese powder 0.4~1.0, nickel powder 1.8~2.6, graphite powder 0.4~1.0, chromium powder 0.2~0.6, lubricant 0.6~1.0, anti-segregation binding agent 0.30~0.5；This Processing technology comprises the following steps：
A, batch mixing：Will be including iron powder, copper powder, manganese powder, nickel powder, chromium powder, graphite powder, lubricant and anti-segregation binding agent Raw material put into mixer and be stirred mixing；
B, compression molding：It is 7.3~7.36g/cm that mixed raw material, which is poured into mould, and is pressed into density3Pressed compact, Wherein, the temperature for controlling mould is 130~150 DEG C, and specific mo(u)lding pressure is 6.5~7.5T/cm2；
C, annular groove is processed：By pressed compact clamping on lathe, and ring is processed on the side wall of pressed compact by way of turning Groove；
D, sinter：It will complete the pressed compact after annular groove is processed to be put into sintering furnace, and be mixed what hydrogen and nitrogen were formed Close and sintered 35~45 minutes under the protection of gas, wherein, sintering temperature is controlled at 1130~1150 DEG C；
E, it is heat-treated：Pressed compact after sintering is put into heat-treatment furnace, then toward being passed through carbo-nitriding in heat-treatment furnace With mixed gas and carbo-nitriding processing is carried out, wherein, treatment temperature controls 860~880 DEG C, and processing time is 40~50 points Clock；
F, oil quenching：Oil quenching processing is carried out to the pressed compact after Overheating Treatment at a temperature of 840~860 DEG C；
G, cool down：Oil cooling processing is carried out to the pressed compact after oil quenching under the cooling velocity of 110 DEG C/10min, makes the temperature of pressed compact Degree is cooled to 180~200 DEG C；
H, it is tempered：Pressed compact after cooling is put into tempering furnace and carries out temper, temperature control 180~ 200 DEG C, tempering time is controlled in 55~65min；
I, vacuum cleaned：Pressed compact after tempering is put into cleaning equipment, to wash away in pressed compact surface and pressed compact hole Greasy dirt；
J, hole seals：Pressed compact after cleaning is put into hole covering machine, and by hole sealing agent with seal pressed compact from it is inner to The hole of outer distribution.
In above-mentioned duplex chain wheel processing technology, zinc electroplating with iridescent yellow chromate conversion coating processing is carried out to pressed compact surface after J steps.
In above-mentioned duplex chain wheel processing technology, the sintering time of the D steps is 40 minutes.
In above-mentioned duplex chain wheel processing technology, the sintering temperature of the D steps is controlled at 1140 DEG C.
In above-mentioned duplex chain wheel processing technology, hydrogen and nitrogen are formed in the D steps mixed gas Ratio is：Hydrogen accounts for 5%, and nitrogen accounts for 95%.
In above-mentioned duplex chain wheel processing technology, carbo-nitriding mixed gas in the E steps by propane and Nitrogen forms, wherein, propane accounts for the 85% of carbo-nitriding mixed gas volume, and nitrogen accounts for carbo-nitriding mixed gas volume 15%.
In above-mentioned duplex chain wheel processing technology, the hole sealing agent is TS-2 type hole sealing agents.
Compared with prior art, this duplex chain wheel processing technology has the following advantages：
1st, density is disposably pressed into by die material up to 7.3~7.36g/cm3Pressed compact, have it is high in machining efficiency, The advantages of stock utilization is high, high precision machining.
2nd, under the action of the processing steps such as heat treatment, oil quenching, tempering, the intensity of sprocket wheel can be effectively improved, has sprocket wheel Standby high intensity, impact-resistant advantage.
3rd, first pressed compact hole is sealed before zinc electroplating with iridescent yellow chromate conversion coating, so just can effectively avoid electrolyte and oozed from pressed compact hole Go out, make tint consistent, effectively improve sprocket wheel presentation quality.
4th, small with equipment investment, mould heating part is simple, and less investment, cost is low, easy to control, simple production process, The advantages of being very suitable for producing in enormous quantities.
Brief description of the drawings
Fig. 1 is the forward sight structure diagram of duplex chain wheel.
Fig. 2 is the schematic cross-sectional view of duplex chain wheel.
Fig. 3 is the schematic cross-sectional view of pressed compact.
In figure, 1, pressed compact；2nd, annular groove.
Embodiment
It is the specific embodiment of the present invention and with reference to attached drawing below, technical scheme is further described, But the present invention is not limited to these embodiments.
Embodiment one
Duplex chain wheel is made by the raw material of following mass percent：Iron powder 92~94, copper powder 2.5~2.8, manganese powder 0.4~ 1.0, nickel powder 1.8~2.6, graphite powder 0.4~1.0, chromium powder 0.2~0.6, lubricant 0.6~1.0, anti-segregation binding agent 0.30 ~0.5.
This duplex chain wheel processing technology comprises the following steps：
A, batch mixing：Will be including iron powder, copper powder, manganese powder, nickel powder, chromium powder, graphite powder, lubricant and anti-segregation binding agent Raw material put into mixer and be stirred mixing.Preferably, the ratio of above-mentioned raw materials is：Iron powder 93, copper powder 2.6, manganese Powder 0.5, nickel powder 2.0, graphite powder 0.5, chromium powder 0.4, lubricant 0.8, anti-segregation binding agent 0.4.
B, it is 7.3~7.36g/cm to pour into mould mixed raw material and be pressed into density3Pressed compact 1, wherein, control The temperature of mould is 130~150 DEG C, and specific mo(u)lding pressure is 6.5~7.5T/cm2.The shape of the above-mentioned pressed compact 1 such as institute of attached drawing 3 Show.
C, annular groove 2 is processed：By 1 clamping of pressed compact on lathe, and processed by way of turning on the side wall of pressed compact 1 Annular groove 2.After completion of processing, pressed compact 1 is removed from lathe, at this time, the shape of pressed compact 1 and the shape of duplex chain wheel are identical , as shown in Figures 1 and 2.
D, sinter：The pressed compact 1 after annular groove 2 is processed will be completed to be put into sintering furnace, and formed in hydrogen and nitrogen Sintered 35~45 minutes under the protection of mixed gas, wherein, sintering temperature is controlled at 1130~1150 DEG C.It is preferred that sintering time For 40 minutes；Sintering temperature is controlled at 1140 DEG C；The ratio for the mixed gas that hydrogen and nitrogen are formed is：Hydrogen accounts for 5%, nitrogen Gas accounts for 95%.
E, it is heat-treated：Pressed compact 1 after sintering is put into heat-treatment furnace, is then vacuumized heat-treatment furnace, it is then past Carbo-nitriding is passed through in heat-treatment furnace with mixed gas and carries out carbo-nitriding processing, wherein, treatment temperature control 860~880 DEG C, processing time is 40~50 minutes.Preferably, carbo-nitriding is made of with mixed gas propane and nitrogen, wherein, propane The 85% of carbo-nitriding mixed gas volume is accounted for, nitrogen accounts for the 15% of carbo-nitriding mixed gas volume；Treatment temperature control For system at 870 DEG C, processing time is 45 minutes.
F, oil quenching：Oil quenching processing is carried out to the pressed compact 1 after Overheating Treatment at a temperature of 840~860 DEG C.It is it is preferred that above-mentioned Temperature be 850 DEG C.
G, cool down：Oil cooling processing is carried out to the pressed compact 1 after oil quenching under the cooling velocity of 110 DEG C/10min, makes pressed compact 1 Temperature is cooled to 180~200 DEG C.
H, it is tempered：Pressed compact 1 after cooling is put into tempering furnace and carries out temper, temperature control 180~ 200 DEG C, tempering time is controlled in 55~65min.It is preferred that temperature control is at 190 DEG C, tempering time 1h.
I, vacuum cleaned：Pressed compact 1 after tempering is put into cleaning equipment, to wash away 1 hole of 1 surface of pressed compact and pressed compact In greasy dirt.
J, hole seals：Pressed compact 1 after cleaning is put into hole covering machine, and by hole sealing agent to seal pressed compact 1 from inner To the hole of outer distribution.It is preferred that above-mentioned hole sealing agent is TS-2 type hole sealing agents.
K, zinc electroplating with iridescent yellow chromate conversion coating：One layer of Coloured film or interference film are produced on 1 surface of pressed compact with the method for chemistry or electrochemistry.
Embodiment two
The present embodiment two is essentially identical with the structure and principle of embodiment one, and different place is：It is double for manufacturing The ratio of the raw material of row chain wheel is：Iron powder 92, copper powder 2.5, manganese powder 0.4, nickel powder 1.8, graphite powder 0.4, chromium powder 0.2, lubricant 0.6, anti-segregation binding agent 0.3.
Embodiment three
The present embodiment three is essentially identical with the structure and principle of embodiment one, and different place is：It is double for manufacturing The ratio of the raw material of row chain wheel is：Iron powder 94, copper powder 2.8, manganese powder 1.0, nickel powder 2.6, graphite powder 1, chromium powder 0.6, lubricant 1, Anti- segregation binding agent 0.5.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led The technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar way Generation, but without departing from spirit of the invention or beyond the scope of the appended claims.

Claims (7)

1. a kind of duplex chain wheel processing technology, it is characterised in that duplex chain wheel is made by the raw material of following mass percent：Iron powder 92~94, copper powder 2.5~2.8, manganese powder 0.4~1.0, nickel powder 1.8~2.6, graphite powder 0.4~1.0, chromium powder 0.2~0.6, profit Lubrication prescription 0.6~1.0, anti-segregation binding agent 0.30~0.5；This processing technology comprises the following steps：
A, batch mixing：By the original including iron powder, copper powder, manganese powder, nickel powder, chromium powder, graphite powder, lubricant and anti-segregation binding agent Material, which is put into mixer, is stirred mixing；
B, compression molding：It is 7.3~7.36g/cm that mixed raw material, which is poured into mould, and is pressed into density3Pressed compact (1), its In, the temperature for controlling mould is 130~150 DEG C, and specific mo(u)lding pressure is 6.5~7.5T/cm2；
C, annular groove (2) is processed：By pressed compact (1) clamping on lathe, and processed by way of turning on the side wall of pressed compact (1) Go out annular groove (2)；
D, sinter：The pressed compact (1) after annular groove (2) is processed will be completed to be put into sintering furnace, and formed in hydrogen and nitrogen Sintered 35~45 minutes under the protection of mixed gas, wherein, sintering temperature is controlled at 1130~1150 DEG C；
E, it is heat-treated：Pressed compact (1) after sintering is put into heat-treatment furnace, is then used toward being passed through carbo-nitriding in heat-treatment furnace Mixed gas simultaneously carries out carbo-nitriding processing, wherein, treatment temperature controls 860~880 DEG C, and processing time is 40~50 minutes；
F, oil quenching：Oil quenching processing is carried out to the pressed compact (1) after Overheating Treatment at a temperature of 840~860 DEG C；
G, cool down：Oil cooling processing is carried out to the pressed compact (1) after oil quenching under the cooling velocity of 110 DEG C/10min, makes pressed compact (1) Temperature is cooled to 180~200 DEG C；
H, it is tempered：Pressed compact after cooling (1) is put into tempering furnace and carries out temper, temperature is controlled 180~200 DEG C, tempering time is controlled in 55~65min；
I, vacuum cleaned：Pressed compact (1) after tempering is put into cleaning equipment, to wash away pressed compact (1) surface and pressed compact (1) hole Greasy dirt in gap；
J, hole seals：Pressed compact (1) after cleaning is put into hole covering machine, and by hole sealing agent to seal pressed compact (1) from inner To the hole of outer distribution.
2. duplex chain wheel processing technology according to claim 1, it is characterised in that after J steps to pressed compact (1) surface into The processing of row zinc electroplating with iridescent yellow chromate conversion coating.
3. duplex chain wheel processing technology according to claim 1, it is characterised in that the sintering time of the D steps is 40 minutes.
4. according to the duplex chain wheel processing technology described in claim 1 or 2 or 3, it is characterised in that the sintering of the D steps Temperature control is at 1140 DEG C.
5. according to the duplex chain wheel processing technology described in claim 1 or 2 or 3, it is characterised in that hydrogen in the D steps The ratio of the mixed gas formed with nitrogen is：Hydrogen accounts for 5%, and nitrogen accounts for 95%.
6. according to the duplex chain wheel processing technology described in claim 1 or 2 or 3, it is characterised in that the carbon in the E steps Nitrogen permeation is made of with mixed gas propane and nitrogen, wherein, propane accounts for the 85% of carbo-nitriding mixed gas volume, nitrogen Account for the 15% of carbo-nitriding mixed gas volume.
7. according to the duplex chain wheel processing technology described in claim 1 or 2 or 3, it is characterised in that the hole sealing agent is TS-2 Type hole sealing agent.
CN201711171918.2A 2017-11-22 2017-11-22 A kind of duplex chain wheel processing technology Withdrawn CN107900324A (en)

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CN113523285A (en) * 2021-07-13 2021-10-22 扬州保来得科技实业有限公司 Preparation method of powder metallurgy high-density multi-row-tooth chain wheel

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CN102672176A (en) * 2012-05-23 2012-09-19 海安县鹰球集团有限公司 High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge
CN102672183A (en) * 2012-05-11 2012-09-19 马鞍山市华东粉末冶金厂 Method for producing bevel gear with ratchet on end face through powder metallurgy warm forming

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JP2002317203A (en) * 2001-04-19 2002-10-31 Daido Steel Co Ltd Martensitic stainless steel grain
CN101245420A (en) * 2008-01-09 2008-08-20 吉林大学 Sintered carbon, copper complex seeping method for producing high-strength powder metallurgy material
CN101444845A (en) * 2008-09-24 2009-06-03 重庆华孚工业股份有限公司 Method for producing powder metallurgy toothed sleeve
CN101634238A (en) * 2009-08-31 2010-01-27 桐城市汽车部件有限公司 Temperature-pressure-die wall lubrication valve seat containing rare earth powder metallurgy 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
CN102672183A (en) * 2012-05-11 2012-09-19 马鞍山市华东粉末冶金厂 Method for producing bevel gear with ratchet on end face through powder metallurgy warm forming
CN102672176A (en) * 2012-05-23 2012-09-19 海安县鹰球集团有限公司 High-abrasion-resistance powder metallurgical spherical hinge for excavating machine and manufacture method of spherical hinge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113523285A (en) * 2021-07-13 2021-10-22 扬州保来得科技实业有限公司 Preparation method of powder metallurgy high-density multi-row-tooth chain wheel

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Application publication date: 20180413