CN108994306A - A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub - Google Patents

A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub Download PDF

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Publication number
CN108994306A
CN108994306A CN201810851778.1A CN201810851778A CN108994306A CN 108994306 A CN108994306 A CN 108994306A CN 201810851778 A CN201810851778 A CN 201810851778A CN 108994306 A CN108994306 A CN 108994306A
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CN
China
Prior art keywords
sinter
synchromesh gear
hardened
hub
degree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810851778.1A
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Chinese (zh)
Inventor
苏镇坚
李率
邓启富
赵善杰
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Guangdong Dong Mu New Material Co Ltd
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Guangdong Dong Mu New Material Co Ltd
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Publication date
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Priority to CN201810851778.1A priority Critical patent/CN108994306A/en
Publication of CN108994306A publication Critical patent/CN108994306A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08Manufacture 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F3/1017Multiple heating or additional steps
    • B22F3/1021Removal of binder or filler
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • B22F2003/1042Sintering only with support for articles to be sintered
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F2998/00Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10Processes characterised by the sequence of their steps

Abstract

The invention discloses a kind of sinter-hardened techniques of powder metallurgy synchronizer tooth hub, comprising the following steps: a, mixing, the Cu that content is 1~4% by mass percentage, 1~4% Ni, 0.5~2% Mo, 0.5~1.5% C, and 0.5~0.7% wax-base lubricant, remaining is Fe;B, compression moulding, shaping density 7.0g/cc;C, it is sent into sintering furnace and carries out hardening sintering, sintering furnace is divided into 650~750 degree of area of pre-burning dewaxing, 800~1080 degree of heating zone, 1120 degree of heat preservation zone, the quick air cooling in sinter-hardened area (cooling velocity is 2.5-3 degrees second), circulating water area, synchromesh gear hub is held using ceramic honey comb washer support, the placing direction of synchromesh gear hub is contrary with forming;D, it comes out and cools down.Synchromesh gear hub is held using ceramic honey comb washer support, the placing direction of synchromesh gear hub with shape contrary, using gravity principle, stress release when sintering corrects tooth form, the teeth directional of synchromesh gear hub external tooth, guarantees the dimensional accuracy of synchromesh gear hub product.

Description

A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub
Technical field
The present invention relates to powder metallurgical technologies, the specifically sinter-hardened technique of powder metallurgy synchronizer tooth hub.
Background technique
Tooth hub thunder part is to improve tooth hub intensity in traditional powder metallurgy production, generally using at teeth portion high-frequency quenching heat The techniques such as reason, integral quenching heat treatment obtain higher mechanical property, and sinter-hardened opposite tooth hub high-frequency quenching is heat-treated, is whole Sintering and heat treatment can be merged into a process by body quenching heat treatment, be waited until by rapid cooling after sintering higher Mechanical property, but hardness, tooth form teeth directional etc. are difficult to reach drawing requirement up and down on sinter-hardened surface, and due to sinter-hardened Afterwards, product hardness is high, it is difficult to the geometric tolerances such as tooth form, tooth form for correcting tooth hub by rear process finishing.Referring to Fig.1, Fig. 2, Diagram is a kind of synchromesh gear hub, and now applicant develops the sinter-hardened technique of tooth hub, can get mechanical property preferably, size The higher product of precision.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub, Sinter-hardened acquisition mechanical property is preferable, the higher tooth hub product of dimensional accuracy.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub, comprising the following steps: a, mixing contain by mass percentage The Cu, 1~4% Ni, 0.5~2% Mo that amount is 1~4%, 0.5~1.5% C and 0.5~0.7% cerul lubrication Agent, remaining is Fe;B, compression moulding, shaping density 7.0g/cc;C, it is sent into sintering furnace and carries out hardening sintering, sintering furnace is divided into 650~750 degree of area of pre-burning dewaxing, 800~1080 degree of heating zone, 1120 degree of heat preservation zone, the quick air cooling in sinter-hardened area are (cooling Speed be 2.5-3 degrees second), circulating water area, synchromesh gear hub, the pendulum of synchromesh gear hub are held using ceramic honey comb washer support It is contrary with forming to put direction;D, it comes out and cools down.
As an improvement of the above technical solution, the ceramic honey comb washer be circular ring shape, the ceramic honey comb washer it is interior Hole is adapted with the inner hole of synchromesh gear hub.
As a further improvement of the above technical scheme, synchromesh gear hub is emitted on the mesh belt of sintering furnace at four column, is leaned on Two column synchromesh gear hubs of nearly mesh belt are single layer, and the two column synchromesh gear hubs positioned at mesh belt center are bilayer.
It is further improved, in the step c, the top of mesh belt is arranged in the air inlet in the sinter-hardened area of sintering furnace, out The lower section of mesh belt is arranged in air port.
It being further improved, in the step c, the temperature in the pre-burning dewaxing area of sintering furnace is 650~750 degree, protective atmosphere, Mesh belt movement speed is 166.7mm/min, using fast dewaxing device fast dewaxing.
The beneficial effects of the present invention are: the present invention passes through in its mass percentage content are as follows: 1~4% Cu, 1~4% Ni, 0.5~2% Mo, 0.5~1.5% C and 0.5~0.7% wax-base lubricant, remaining is matching for the composite material of Fe Than under mixing, the synchromesh gear hub for being 7.0g/cc by compression moulding density, sinter-hardened technique through the invention obtains power Learn better performances, the higher product of dimensional accuracy;Synchromesh gear hub is held using ceramic honey comb washer support, synchromesh gear hub is put Direction with shape contrary, using gravity principle, stress release when sintering corrects tooth form, the teeth directional of synchromesh gear hub external tooth, Guarantee the dimensional accuracy of synchromesh gear hub product.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the top view of synchromesh gear hub;
Fig. 2 is the cross-sectional view of synchromesh gear hub;
Fig. 3 is the cross-sectional view that ceramic honey comb washer support holds synchromesh gear hub;
Fig. 4 is the top view of ceramic honey comb washer;
Fig. 5 is the schematic diagram in the sinter-hardened area of sintering furnace.
Specific embodiment
- Fig. 5 referring to Fig.1, a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub, comprising the following steps: a, mixing are pressed The Cu, 1~4% Ni, 0.5~2% Mo that mass percentage content is 1~4%, 0.5~1.5% C and 0.5~ 0.7% wax-base lubricant, remaining is Fe;B, compression moulding, shaping density 7.0g/cc;C, it is sent into sintering furnace and carries out hardening burning Knot, sintering furnace be divided into pre-burning dewaxing 650~750 degree of area, 800~1080 degree of heating zone, protective atmosphere (N2, H2 gaseous mixture), together Step device tooth hub 1 gradually heats up, and guarantees the heating rate of synchromesh gear hub 1, reduces deformation, the heat preservation zone 1120 of synchromesh gear hub 1 Degree, protective atmosphere (N2, H2 gaseous mixture), soaking time 20min guarantee that liquid-phase sintering and alloying, burning occur for synchromesh gear hub 1 It ties the quick air cooling in hardening zone (cooling velocity be 2.5-3 degrees second), synchromesh gear hub 1 occurs sinter-hardened, forms enough horses The mechanical properties, circulating water area (30~50 degree) such as family name's body, raising product surface hardness, tensile strength, protective atmosphere (N2, H2 gaseous mixture), stable prod size and metallographic structure prevent product from aoxidizing;D, it comes out and cools down.The external splines of synchromesh gear hub 1 There are taper, when compression moulding, is not up big and down small, holds synchromesh gear hub 1 using 2 support of ceramic honey comb washer and is placed on mesh belt, together The placing direction for walking device tooth hub 1 is contrary with forming, i.e., synchromesh gear hub 1 is up-small and down-big on ceramic honey comb washer 2, benefit With gravity principle, stress release when sintering corrects tooth form, the teeth directional of 1 external tooth of synchromesh gear hub, guaranteeing teeth directional, taper exists up and down Within 0.02mm, dimensional accuracy is improved.Preferably, the ceramic honey comb washer 2 is circular ring shape, the ceramic honey comb washer 2 Inner hole be slightly less than the inner hole of synchromesh gear hub 1,2 ventilatory capacity of ceramic honey comb washer of circular ring shape is big, improves synchromesh gear hub 1 and burns The cooling velocity of hardening is tied, even if blower frequency drops to 45Hz from 50Hz, cooling rate controls the synchronizer at 2.5~3 degree/s 1 hardness of tooth hub is still ensured that in HV5 >=300.In the present embodiment, it is preferred that in the step c, synchromesh gear hub 1 is at four column It is emitted on the mesh belt of sintering furnace, the two column synchromesh gear hubs 1 close to mesh belt are single layer, the two column synchronizers positioned at mesh belt center Tooth hub 1 is bilayer, and the top of mesh belt is arranged in the air inlet in the sinter-hardened area of sintering furnace, and air outlet is arranged under mesh belt Side.The column arrangement of synchromesh gear hub 1 four is staged overlapped way, and sinuous flow occurs in the wind of blower blowout when reducing cooling, is mentioned simultaneously Height sintering production capacity.In the present embodiment, it is preferred that in the step c, the temperature in the pre-burning dewaxing area of sintering furnace is 650~750 Degree, protective atmosphere (N2, H2 gaseous mixture), mesh belt movement speed is 166.7mm/min, using fast dewaxing device fast dewaxing, Using Fast Sintering dewaxing device and sintering dewaxing area's temperature is improved, prevents lubricant from entering high-temperature region and contains with synchromesh gear hub 1 Catalysis reaction occurs for some element Ni, and synchromesh gear hub 1 is caused to burst.

Claims (6)

1. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub, which comprises the following steps: a, mixing, by matter Measure Cu, 1~4% Ni, 0.5~2% Mo, 0.5~1.5% C and 0.5~0.7% that degree is 1~4% Wax-base lubricant, remaining is Fe;B, compression moulding, shaping density 7.0g/cc;C, it is sent into sintering furnace and carries out hardening sintering, burn Freezing of a furnace is divided into pre-burning dewaxing 650~750 degree of area, 800~1080 degree of heating zone, 1120 degree of heat preservation zone, the quick wind in sinter-hardened area Synchromesh gear hub, the placing direction of synchromesh gear hub and forming side are held using ceramic honey comb washer support by cooling, circulating water area To opposite;D, it comes out and cools down.
2. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub according to claim 1, which is characterized in that the bee Nest ceramic washer is circular ring shape, and the inner hole of the ceramic honey comb washer is adapted with the inner hole of synchromesh gear hub.
3. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub according to claim 1 or 2, which is characterized in that same Step device tooth hub is emitted on the mesh belt of sintering furnace at four column, and the two column synchromesh gear hubs close to mesh belt are single layer, is located in mesh belt Two column synchromesh gear hubs of the heart are bilayer.
4. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub according to claim 1, which is characterized in that the step In rapid c, the top of mesh belt is arranged in the air inlet in the sinter-hardened area of sintering furnace, and the lower section of mesh belt is arranged in air outlet.
5. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub according to claim 1, which is characterized in that the step In rapid c, the temperature in the pre-burning dewaxing area of sintering furnace is 650~750 degree, and protective atmosphere, mesh belt movement speed is 166.7mm/ Min, using fast dewaxing device fast dewaxing.
6. a kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub according to claim 1, which is characterized in that the step In rapid c, sinter-hardened area's cooling velocity of sintering furnace is 2.5-3 degrees second.
CN201810851778.1A 2018-07-27 2018-07-27 A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub Pending CN108994306A (en)

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CN201810851778.1A CN108994306A (en) 2018-07-27 2018-07-27 A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub

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Application Number Priority Date Filing Date Title
CN201810851778.1A CN108994306A (en) 2018-07-27 2018-07-27 A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH094652A (en) * 1995-04-21 1997-01-07 Aisin Ee I Kk Synchronizer ring
CN202246767U (en) * 2011-07-07 2012-05-30 四川柳河齿轮有限公司 Device for controlling heat treatment deformation of thin wall parts of gear sleeve and gear ring
CN103382519A (en) * 2013-08-05 2013-11-06 天津天海同步科技股份有限公司 Charging basket for thermal treatment of synchronizer gear hub
CN203487198U (en) * 2013-08-05 2014-03-19 天津天海同步科技股份有限公司 Gasket group for thermal treatment on gear hub
CN105499588A (en) * 2015-12-09 2016-04-20 碧梦技(上海)复合材料有限公司 Powder metallurgy manufacturing technology of synchronizer gear hub
CN107309430A (en) * 2017-08-10 2017-11-03 攀枝花学院 A kind of large parts metal powder injection molding method
CN107812948A (en) * 2017-11-08 2018-03-20 江苏智造新材有限公司 A kind of processing method of powder metallurgy synchronizer tooth hub
CN109702208A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH094652A (en) * 1995-04-21 1997-01-07 Aisin Ee I Kk Synchronizer ring
CN202246767U (en) * 2011-07-07 2012-05-30 四川柳河齿轮有限公司 Device for controlling heat treatment deformation of thin wall parts of gear sleeve and gear ring
CN103382519A (en) * 2013-08-05 2013-11-06 天津天海同步科技股份有限公司 Charging basket for thermal treatment of synchronizer gear hub
CN203487198U (en) * 2013-08-05 2014-03-19 天津天海同步科技股份有限公司 Gasket group for thermal treatment on gear hub
CN105499588A (en) * 2015-12-09 2016-04-20 碧梦技(上海)复合材料有限公司 Powder metallurgy manufacturing technology of synchronizer gear hub
CN107309430A (en) * 2017-08-10 2017-11-03 攀枝花学院 A kind of large parts metal powder injection molding method
CN107812948A (en) * 2017-11-08 2018-03-20 江苏智造新材有限公司 A kind of processing method of powder metallurgy synchronizer tooth hub
CN109702208A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs

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