CN106319364A - Car model differential gear and powder metallurgy process - Google Patents
Car model differential gear and powder metallurgy process Download PDFInfo
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- CN106319364A CN106319364A CN201610492695.9A CN201610492695A CN106319364A CN 106319364 A CN106319364 A CN 106319364A CN 201610492695 A CN201610492695 A CN 201610492695A CN 106319364 A CN106319364 A CN 106319364A
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000004663 powder metallurgy Methods 0.000 title abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 95
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 50
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 23
- 239000001257 hydrogen Substances 0.000 claims abstract description 23
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 239000000314 lubricant Substances 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 12
- 238000004512 die casting Methods 0.000 claims abstract description 10
- 238000003754 machining Methods 0.000 claims abstract description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 21
- 230000008595 infiltration Effects 0.000 claims description 21
- 238000001764 infiltration Methods 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 230000001681 protective effect Effects 0.000 claims description 21
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 238000012805 post-processing Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- 239000010974 bronze Substances 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional 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
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- B22F2003/023—Lubricant mixed with the metal powder
Abstract
The invention discloses a powder metallurgy process. The powder metallurgy process comprises the following steps that 1), molding is conducted, wherein a warm-pressing lubricant is added to iron-based powder, mixed and then put into a molding die at the die temperature of 100 DEG C to 120 DEG C and is subjected to die-casting molding through a press till the density of a workblank obtained through die-casting is larger than or equal to 7.35 g/m<3>; 2), primary sintering is conducted, wherein under the nitrogen-hydrogen sintering atmosphere protection effect, high-temperature sintering is conducted at the temperature of 1,120 DEG C to 1,150 DEG C for 35 minutes to 40 minutes; 3), shaping is conducted, wherein shaping is conducted on the workblank obtained after primary sintering is conducted through a machining manner, and a primary sintered product is obtained; 4), secondary sintering is conducted, the primary sintered product is subjected to high-temperature sintering at the temperature of 1,180 DEG C to 1,200 DEG C for 30 min to 35 min under the nitrogen-hydrogen sintering atmosphere protection effect, and a secondary sintered product with the density being larger than or equal to 7.4 g/cm<3> is obtained; and 5), post-treatment is conducted, the secondary sintered product is subjected to a washing working procedure, and a finished product is obtained. The invention further discloses a car model differential gear produced through the powder metallurgy process.
Description
Technical field
The invention belongs to powder metallurgical technology, concrete for a kind of powder metallurgical technique and use this powder metallurgy work
The car mould differential gear that skill produces.
Background technology
Gear, as the strength member of vehicle drive system difference device, is generally individually to use steel forging stock and utilize machinery to add
The mode of work manufacture produces, but along with the development of car mould industry, particularly lithium power technology application on car mould, to differential
The requirement of the parts such as device gear improves constantly, and causes at aspects such as cost control, delivery date, production efficiency and drive noise,
Traditional machining gear is difficult to meet requirement.
In view of this, meeting the requirement to parts of the car mould vehicle, the application is intended to find one can not only manufacture shape
Shape complex parts, and there is the gear manufacturing technology of the advantages such as joint material, energy-conservation, saving of labor and high-quality, with applicable production in enormous quantities
And manufacture.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of car mould differential gear and powder metallurgical technique, using should
Shape and structure and the mechanical performance of the car mould differential gear that powder metallurgical technique production obtains all disclosure satisfy that use requirement.
For reaching above-mentioned purpose, the present invention provides following technical scheme:
Present invention firstly provides a kind of powder metallurgical technique, comprised the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the molding that mould temperature is 100 DEG C-120 DEG C
In mould, utilize press die cast, until the density of blank that die casting obtains is more than or equal to 7.35g/m；
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 35-40min of 1120-1150 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1180-1200 DEG C of high temperature
Sintering 30-35min, obtains the density double sintering goods more than or equal to 7.4g/cm；
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Further, described press uses 100T full automatic press.
Further, the formula of described iron-based powder and the weight content of each component are: Fe:93%-95 %；Cu:1.5%-
4%；C:0.6%-0.9 %；Ni:1.85%-2.55 %；Mo:0.3%-0.6 %；Mn:0.05%-0.3 %；Si:0%-0.2%；
N:0.00%-0.03%；S:0.15%-0.3%；Remaining is impurity.
Further, the addition of described temperature and pressure lubricant is the 0.3-0.5% of described iron-based powder quality.
Further, in described step 4), in described second time sintering process, described first sintered article is carried out infiltration
Process.
Further, the method that described infiltration processes is: copper alloy powder is made the green compact of definite shape by mould,
During described first sintered article second time sintering, itself and described first sintered article are stacked together, and in nitrogen hydrogen sintering atmosphere
Under protective effect, copper alloy green compact dissolve, and in the interconnected pore penetrating into described first sintered article of flowing, fill described for the first time
The hole of sintered article, forms the double sintering goods with copper-steel construction.
The invention allows for a kind of car mould differential gear, described gear uses powder metallurgical technique system as above
Become.
The beneficial effects of the present invention is:
The powder metallurgical technique of the present invention, by obtaining product by being respectively adopted two-step sintering after iron-based powder die cast again
In die casting, product, are to ensure that the density of blank reaches more than or equal to 7.35g/m, after sintered process, the density of finished product reaches
More than 7.4g/cm, torsional test ＞ 35N.M.Gear surface hardness reaches HRC45；Therefore, this powder metallurgical technique system is used
Make the car mould differential gear obtained, it is possible to meet the requirement of strength of car mould differential gear.
By carrying out infiltration process in second time sintering process, with ferrum or the carbon steel powder metallurgy of traditional sintered state
Goods are compared, and improve product compactness, have refined crystal grain, improve microscopic structure, i.e. improve the density of material, carry
The high comprehensive mechanical performances such as the tensile strength of product, percentage elongation, hardness, impact property, meanwhile, interconnected pore is copper alloy envelope
Closing, also improve air-tightness and the Corrosion Protection of part, after heat treatment, piece surface forms one layer of apparent carburizing
Layer so that piece surface is hard and wear-resisting, and heart portion is still toughness.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, so that those skilled in the art can be more preferable
Understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
The car mould differential gear of the present embodiment, uses powder metallurgical technique to make.Concrete, the powder metallurgy work of the present embodiment
Skill, comprises the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the mould that mould temperature is 100 DEG C DEG C
In, utilize press die cast, until the density of blank that die casting obtains uses equal to 7.35g/m, the press of the present embodiment
100T full automatic press, the addition of temperature and pressure lubricant is the 0.3% of iron-based powder quality.
The formula of the iron-based powder of the present embodiment and the weight content of each component be: Fe:93%；Cu:4%；C:0.6%%；
Ni:1.85%；Mo:0.3%；Mn:0.05%；Si:0%；N:0.03%；S:0.15%；Remaining is impurity.
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 40min of 1120 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1180 DEG C of high temperature sinterings
35min, obtains the density double sintering goods equal to 7.4g/cm；
In second time sintering process, first sintered article is carried out infiltration process.The method that the infiltration of the present embodiment processes is:
Copper alloy powder is made the green compact of definite shape, when described first sintered article second time sintering by itself and institute by mould
State first sintered article to be stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing
In the interconnected pore of described first sintered article, fill the hole of described first sintered article, formed and there is the two of copper-steel construction
Secondary sintered article.
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Embodiment 2
The car mould differential gear of the present embodiment, uses powder metallurgical technique to make.Concrete, the powder metallurgy work of the present embodiment
Skill, comprises the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the mould that mould temperature is 120 DEG C
In, utilize press die cast, until the density of blank that die casting obtains uses equal to 7.37g/m, the press of the present embodiment
100T full automatic press, the addition of temperature and pressure lubricant is the 0.5% of iron-based powder quality.
The formula of the iron-based powder of the present embodiment and the weight content of each component be: Fe:95 %；Cu:1.5%；C:0.9
%；Ni:2.00 %；Mo:0.3%；Mn:0.07%；Si:0%；N:0.00%；S:0.20%；Remaining is impurity.
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 35min of 1150 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1200 DEG C of high temperature sinterings
30min, obtains the density double sintering goods more than or equal to 7.41g/cm；
In second time sintering process, first sintered article is carried out infiltration process.The method that the infiltration of the present embodiment processes is:
Copper alloy powder is made the green compact of definite shape, when described first sintered article second time sintering by itself and institute by mould
State first sintered article to be stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing
In the interconnected pore of described first sintered article, fill the hole of described first sintered article, formed and there is the two of copper-steel construction
Secondary sintered article.
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Embodiment 3
The car mould differential gear of the present embodiment, uses powder metallurgical technique to make.Concrete, the powder metallurgy work of the present embodiment
Skill, comprises the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the mould that mould temperature is 110 DEG C
In, utilize press die cast, until the density of blank that die casting obtains uses equal to 7.38g/m, the press of the present embodiment
100T full automatic press, the addition of temperature and pressure lubricant is the 0.4% of iron-based powder quality.
The formula of the iron-based powder of the present embodiment and the weight content of each component be: Fe:94%；Cu:2%；C:0.8 %；
Ni:2.10 %；Mo:0.4%；Mn:0.3%；Si:0.05%；N:0.01%；S:0.3%；Remaining is impurity.
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 37min of 1130 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1190 DEG C of high temperature sinterings
32min, obtains the density double sintering goods more than or equal to 7.42g/cm；
In second time sintering process, first sintered article is carried out infiltration process.The method that the infiltration of the present embodiment processes is:
Copper alloy powder is made the green compact of definite shape, when described first sintered article second time sintering by itself and institute by mould
State first sintered article to be stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing
In the interconnected pore of described first sintered article, fill the hole of described first sintered article, formed and there is the two of copper-steel construction
Secondary sintered article.
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Embodiment 4
The car mould differential gear of the present embodiment, uses powder metallurgical technique to make.Concrete, the powder metallurgy work of the present embodiment
Skill, comprises the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the mould that mould temperature is 105 DEG C
In, utilize press die cast, until the density of blank that die casting obtains uses equal to 7.36g/m, the press of the present embodiment
100T full automatic press, the addition of temperature and pressure lubricant is the 0.3% of iron-based powder quality.
The formula of the iron-based powder of the present embodiment and the weight content of each component be: Fe:93%；Cu:1.5%；C:0.7
%；Ni:2.55 %；Mo:0.6%；Mn:0.1%；Si:0.2%；N:0.02%；S:0.25%；Remaining is impurity.
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 38min of 1140 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1185 DEG C of high temperature sinterings
34min, obtains the density double sintering goods more than or equal to 7.41g/cm；
In second time sintering process, first sintered article is carried out infiltration process.The method that the infiltration of the present embodiment processes is:
Copper alloy powder is made the green compact of definite shape, when described first sintered article second time sintering by itself and institute by mould
State first sintered article to be stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing
In the interconnected pore of described first sintered article, fill the hole of described first sintered article, formed and there is the two of copper-steel construction
Secondary sintered article.
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Embodiment 5
The car mould differential gear of the present embodiment, uses powder metallurgical technique to make.Concrete, the powder metallurgy work of the present embodiment
Skill, comprises the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the mould that mould temperature is 115 DEG C
In, utilize press die cast, until the density of blank that die casting obtains uses equal to 7.39g/m, the press of the present embodiment
100T full automatic press, the addition of temperature and pressure lubricant is the 0.5% of iron-based powder quality.
The formula of the iron-based powder of the present embodiment and the weight content of each component be: Fe:93%；Cu:3%；C:0.7 %；
Ni:2.00 %；Mo:0.5%；Mn:0.2%；Si:0.1%；N:0.01%；S:0.24%；Remaining is impurity.
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 39min of 1125 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1195 DEG C of high temperature sinterings
33min, obtains the density double sintering goods more than or equal to 7.43g/cm；
In second time sintering process, first sintered article is carried out infiltration process.The method that the infiltration of the present embodiment processes is:
Copper alloy powder is made the green compact of definite shape, when described first sintered article second time sintering by itself and institute by mould
State first sintered article to be stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing
In the interconnected pore of described first sintered article, fill the hole of described first sintered article, formed and there is the two of copper-steel construction
Secondary sintered article.
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Embodiment described above is only the preferred embodiment lifted by absolutely proving the present invention, the protection model of the present invention
Enclose and be not limited to this.The equivalent that those skilled in the art are made on the basis of the present invention substitutes or conversion, all in the present invention
Protection domain within.Protection scope of the present invention is as the criterion with claims.
Claims (7)
1. a powder metallurgical technique, it is characterised in that: comprise the steps:
1) molding: after temperature and pressure lubricant is added in mixing in iron-based powder, then be added into the molding that mould temperature is 100 DEG C-120 DEG C
In mould, utilize press die cast, until the density of blank that die casting obtains is more than or equal to 7.35g/m；
2) first sintering: under nitrogen hydrogen sintering atmosphere protective effect, through the high temperature sintering 35-40min of 1120-1150 DEG C；
3) shaping: utilize machining mode that the blank after first sintering is carried out Shape correction, sintered system for the first time
Product；
4) second time sintering: by described first sintered article under nitrogen hydrogen sintering atmosphere protective effect, through 1180-1200 DEG C of high temperature
Sintering 30-35min, obtains the density double sintering goods more than or equal to 7.4g/cm；
4) post processing: after the described cleaned operation of double sintering goods, obtain finished product.
Powder metallurgical technique the most according to claim 1, it is characterised in that: described press uses 100T full automatic press.
Powder metallurgical technique the most according to claim 1, it is characterised in that: the formula of described iron-based powder and each component
Weight content be: Fe:93%-95 %；Cu:1.5%-4%；C:0.6%-0.9 %；Ni:1.85%-2.55 %；Mo:0.3%-
0.6 %；Mn:0.05%-0.3 %；Si:0%-0.2%；N:0.00%-0.03%；S:0.15%-0.3%；Remaining is impurity.
Powder metallurgical technique the most according to claim 1, it is characterised in that: the addition of described temperature and pressure lubricant is described
The 0.3-0.5% of iron-based powder quality.
5. according to the powder metallurgical technique described in any one of claim 1-4, it is characterised in that: in described step 4), described
For the second time in sintering process, described first sintered article is carried out infiltration process.
Powder metallurgical technique the most according to claim 5, it is characterised in that: the method that described infiltration processes is: closed by copper
The green compact of definite shape are made by mould in bronze end, described first sintered article second time sintering time by itself and described for the first time
At the beginning of sintered article is stacked together, and under nitrogen hydrogen sintering atmosphere protective effect, copper alloy green compact dissolve, and infiltration of flowing is described
In the interconnected pore of secondary sintered article, fill the hole of described first sintered article, form the double sintering with copper-steel construction
Goods.
7. a car mould differential gear, it is characterised in that: described gear uses the powder as described in any one of claim 1-6
Metallurgical technology is made.
Priority Applications (1)
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|---|---|---|---|
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| CN107350473A (en) * | 2017-07-24 | 2017-11-17 | 重庆江洲粉末冶金科技有限公司 | A kind of method for improving powder metallurgical helical gear intensity |
| CN109295398A (en) * | 2018-07-30 | 2019-02-01 | 常州格瑞特粉末冶金有限公司 | A kind of powder metallurgy brake boost pump shaft coupling production technology |
| CN109868422A (en) * | 2019-03-14 | 2019-06-11 | 有研粉末新材料（北京）有限公司 | A kind of powder metallurgy firm gear and preparation method thereof |
| CN112264625A (en) * | 2020-10-26 | 2021-01-26 | 扬州海昌新材股份有限公司 | Preparation method of high-density gear |
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| CN106319364B (en) | 2018-02-13 |
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Denomination of invention: Differential gear of car mould and powder metallurgy process Effective date of registration: 20220815 Granted publication date: 20180213 Pledgee: Zhejiang Lanxi Rural Commercial Bank Co.,Ltd. Pledgor: ZHEJIANG XINHE POWDER METALLURGY PRODUCTS CO.,LTD. Registration number: Y2022980012563 |
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