CN109852897A - A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs - Google Patents

A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs Download PDF

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Publication number
CN109852897A
CN109852897A CN201811616438.7A CN201811616438A CN109852897A CN 109852897 A CN109852897 A CN 109852897A CN 201811616438 A CN201811616438 A CN 201811616438A CN 109852897 A CN109852897 A CN 109852897A
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tooth hub
shaping
hub
sintered
tooth
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施昌旭
夏敏
石小荣
张艳伟
戴定中
黄亿奇
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Jiangsu Zhi Xin New Material Co Ltd
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Jiangsu Zhi Xin New Material Co Ltd
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Abstract

The invention belongs to powder metallurgical technologies, it is related to a kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs, process flow includes: mixing → forming → pre-sintering → shaping → machining → deburring → sinter-hardened → tempering → part shot-peening → clean packaging, and the synchromesh gear hub tensile strength of preparation method production increases, reduces risk of breakage due to transmission torque increase;Improve the production efficiency of shaping, machining, deburring, effectively avoid the risk of shaping crackle, greatly reduce the material loss such as machine tool, deburring hairbrush, greatly reduce production energy consumption, remove quenching technology from, product quality is improved, overall cost has dropped 20% or more in original basis, is suitable for producing double clutch large torque automatic gear-box powder metallurgy synchronizer tooth hubs in enormous quantities.

Description

A kind of powder metallurgy preparation of double clutch large torque automatic gear-box synchromesh gear hubs Method
Technical field
The present invention relates to powder metallurgy automobile parts technical fields, and in particular to a kind of double clutch large torque fluid drives The method for preparing powder metallurgy of case synchromesh gear hub.
Background technique
With the continuous development and raising of automotive engineering, driver and passenger the comfort of automobile is required it is higher and higher, it is double from Close the developing direction for representing automatic gear-box.The peak torque born with the raising of automobile discharge capacity, speed changer is also increasing. The gearbox peak torque that low discharge capacity household passenger car carries in general is in 300N.M hereinafter, the change that high discharge capacity deluxe carmodel carries Fast case is usually double clutch large torque automatic gear-box, and peak torque custom requirements are all in 400N.M or so.Double clutch large torques Automatic transmission does not have the fluid torque-converter of traditional automatic transmission, it is one kind of automatic speed changer for machine, it has two to move Power output shaft, one clutch of a company, one controls 1357 grades, another 246 reverse gear of control, in entire shift process, when One group of gear in output power, awaited orders by another group of gear, always maintains one group of gear in output power, is not in The interruption of power transmitting, makes shift process faster, raises speed swifter and more violent.Due to there is no power interruption in large torque transmittance process, While promoting shifting comfort, vehicle fuel consumption is considerably reduced, double clutches represent the developing direction of automatic gear-box. Tooth hub is the important component of speed changer, the correlation mechanical property such as density, hardness, intensity of double clutch large torque automatic transmission tooth hubs The requirement of energy index and precision all compared with conventional transmission device tooth hub improves a lot.The powder metallurgically manufacturing technique of common production tooth hub It is improper to produce double clutch large torque automatic transmission tooth hubs.Double clutch large torque automatic transmission tooth hubs are that typical H-type is multiple Miscellaneous structural member, has complicated more mesa structures and thin-walled section, and external gear teeth has multiple special-shaped keyways.Tooth hub structure: by tooth hub Ontology 1, center splined hole 2, the multi-sections grouping such as two planes a and b, external gear teeth 3, special-shaped keyway 4 and 5 up and down of center splined hole At.The tooth hub global density >=7.0g/cm3, density >=7.1g/cm at special-shaped keyway and tooth hub ontology dowel3, at Product centre hardness 280+80HV10.Tooth hub toothed region required precision within 8 grades, the geometric tolerance of key position 0.03 with It is interior.
Tooth hub is the core component of double clutch large torque automatic gear-box, and overall precision and performance directly decide speed change The safety and stability of case belongs to high density, high intensity, high-precision parts with complex structures.Tooth hub material, which generally uses, to be contained The high-intensitive D39 material of the alloying elements such as Ni and Mo.
The powder metallurgical technique that the prior art produces synchromesh gear hub is general are as follows: mixing → forming → sintering → shaping → machine Processing → high-frequency quenching → tempering → magnetic powder inspection full inspection crackle → demagnetization → clean dry → test package.By whole after sintering Shape corrects profile accuracy, and the geometric tolerance precision for guaranteeing key position is machined by numerical control, improves product by high-frequency quenching Points hardness.The limitation of the prior art: (1) when double clutch large torque automatic gear-box synchronizers work, due to the torsion of carrying Square is big, is most weak position at the special-shaped keyway and tooth hub ontology dowel of tooth hub, should when tooth hub is by larger tensile stress Place is stress action spot, is broken at first, is well over tensile strength and causes the fracture of tooth hub.The tooth hub of prior art production cannot be from root The Fracture Failure Risk is solved on this.(2) since hardness is high after sintering, brittleness is big, shaping is difficult, is easy to produce shaping crackle. (3) due to after sintering hardness it is high, numerical control machine processing efficiency is slow, cutter loss is big, energy consumption is high, and deburring efficiency is slow, hairbrush loss It is high.(4) high-frequency quenching thermal shock, which generates high stress, makes the deformation of tooth hub influence finished product accuracy while have to generate localized cracks risk.
Summary of the invention
The object of the present invention is to provide a kind of double clutch large torque automatic gear-box synchromesh gear hub powder metallurgy preparation sides Method increases the synchromesh gear hub tensile strength of production, reduces risk of breakage due to transmission torque increases;Improve shaping, machine The efficiency of processing, deburring reduces shaping crackle risk and substantially reduces machine tool, the loss of deburring hairbrush and energy consumption; Remove quenching technology from, reduces cost, improves product quality.
The present invention provides a kind of powdered metallurgical material of double clutch large torque automatic gear-box synchromesh gear hubs, the powder The constituent mass percentage of metallurgical material is C:0.5%-0.7%, Cu:1.3%-1.7%, Ni:3.5%-4.5%, Mo: 0.4%-0.6%, remaining as Fe and inevitable impurity.
The constituent mass percentage of the preferred powder metallurgy powder is, C:0.7%, Cu:1.3%, Ni:4.5%, Mo:0.4%, remaining as Fe and inevitable impurity.
The constituent mass percentage of the preferred powdered metallurgical material is, C:0.5%, Cu:1.7%, Ni:3.5%, Mo:0.6%, remaining as Fe and inevitable impurity.
The constituent mass percentage of the preferred powdered metallurgical material is, C:0.6%, Cu:1.5%, Ni:4.0%, Mo:0.5%, remaining as Fe and inevitable impurity.
The present invention also provides the powdered metallurgical material preparation methods, method includes the following steps:
(1) mixing: each raw material composition and mixing are weighed by formula, obtains metallurgical raw material;
(2) it shapes: metallurgical raw material obtained by step (1) being put into compression moulding in the mold of forming machine, obtains tooth hub;
(3) it is pre-sintered, takes step (2) to obtain tooth hub and be pre-sintered, tooth hub must be pre-sintered;
(4) shaping: shaping is carried out by tooth hub is pre-sintered obtained by step (3), makes the relevant profile accuracy of tooth hub, form accuracy Meet technical requirements, obtains tooth hub after shaping;
(5) numerical control machines: tooth hub after shaping obtained by step (4) is carried out CNC machine appropriate according to tooth hub required precision Add cutting;
(6) deburring: burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, unhairing ratchet must be pre-sintered Hub;
(7) sinter-hardened: by tooth hub obtained by step (6), it is put into high temperature continuous fritting furnace, is sintered in oxygen-free environment, Then air-blast quenching is carried out, sinter-hardened tooth hub is obtained;
(8) it is tempered: sinter-hardened 180 DEG C of tooth hub tempering, time 2 h, tooth hub after must being tempered obtained by step (7).
(9) local shot-peening: 6 special-shaped keyways of tooth hub after tempering obtained by step (8) are connected close to tooth hub ontology root Bead is carried out at muscle, obtains shot-peening tooth hub;
(10) it cleans packaging: to shot-peening tooth hub obtained by step (9), cleaning packaging, both.
Preferred this method step (2) manufacturing process is to be suppressed using 500T CNC shaping press, and tooth hub is integrally close Degree >=7.0g/cm3, density >=7.1g/cm at special-shaped keyway and tooth hub ontology dowel3, each shaped segment segmentation density≤ 0.2g/cm3
Preferred this method preferred this method step (3) pre-sintering temperature is 850 DEG C.
Preferred this method step (7) the sinter-hardened process of preferred this method are as follows: sintering uses net belt type Sinter-hardened furnace, 1120 DEG C ± 10 DEG C of sintering temperature, in 90/10N2/H230-45min is sintered in sintering atmosphere, oxygen-free environment is adopted Use hydrogen as protective gas, air-blast quenching employs nitrogen as cooling medium, and cooling rate is about 2.5-5 DEG C/S.
Preferred this method step (9) local shot-blast process method are as follows: to tooth hub 6 special-shaped keyways close to tooth hub sheet Bead is carried out at the dowel of body root, shot peening strength 0.20 to 0.25mmA, coverage rate 150%, keyway and tooth hub ontology connect It connects muscle portion and obtains certain internal residual compression.
Advantageous effects: the invention using be pre-sintered, the production of sinter-hardened and local shot-blast process it is double from Large torque speed changer tooth hub is closed, properties of product is greatly improved, reduces failure risk, reduce by 20% or more cost, promote product matter Amount.(1) Article Stiffness Determination before shaping, machining, deburring is reduced using pre-sintering process, substantially increases shaping, machine adds Work, burr brushing efficiency avoid and generate shaping crackle risk because Article Stiffness Determination is high, brittleness is big, at the same because of product post-processing before Hardness reduces and greatly reduces machine tool, the loss (2) of deburring hairbrush uses sinter-hardened technique, by adjusting Low-alloy steel ingredient, and by sintering process cooling stage and heat treatment in quenching technical organically combine, to make Sintered structural part can obtain the mechanical property of higher intensity and hardness without special high-frequency quenching process, not only drop Low cost, and to the complex-shaped constitutional detail of tooth hub class, it avoids the thermal shock quenched in heat treatment and generates height and answer Power makes that part deformation is big, is easy to produce the disadvantages of crackle, to improve tooth hub tooth form and dimensional accuracy, reduce crackle risk etc. It is largely effective.(3) the purpose of taking local shot-blast process is to improve 6 that increase tooth hub fatigue limit because of transmission torque increase Residual compressive stress of the special-shaped keyway at the dowel of tooth hub ontology root, with partial offset work in where place generation drawing Stress greatly improves tooth hub tensile strength and fatigue life, avoids tooth hub tensile stress excessive and causes risk of breakage.The tooth of non-shot-peening Hub occasionally has fracture failure on large torque gearbox, because fatigue resistance is insufficient.After shot-peening, multiple authentication never occurred because Fatigue strength is insufficient and fracture failure.
Detailed description of the invention
Fig. 1: being a kind of main view of double clutch large torque automatic gear-box synchromesh gear hubs, in which: 1 is tooth hub ontology, a It is two planes of center splined hole or more with b
Fig. 2: being the sectional view along A-A of Fig. 1, in which: 2 is center splined hole, 3 be external gear teeth, 4 and 5 is special-shaped keyway
Specific embodiment
A kind of double clutch large torque automatic gear-box synchromesh gear hub structures represented by attached drawing 1: by tooth hub ontology 1, Center splined hole 2, the multi-sections such as two planes a and b, external gear teeth 3, special-shaped keyway 4 and 5 are grouped as center splined hole up and down.It is described Tooth hub global density >=7.0g/cm3, density >=7.1g/cm at special-shaped keyway and tooth hub ontology dowel3, finished product center portion is hard 280+80HV10 is spent, tooth hub toothed region required precision is within 8 grades, and the geometric tolerance of key position is within 0.03.This pair from Minimum residual compressive stress after closing large torque automatic gear-box synchromesh gear hub shot-peening: depth 3-5um, stress -500Mpa;Depth 50um, stress -700Mpa;Depth 100um, stress -400Mpa.
Embodiment 1: a kind of double clutch large torque automatic gear-box synchromesh gear hub method for preparing powder metallurgy include following Step:
(1) mixing: following raw materials are uniformly mixed by design raw material composition and mixing by mass percentage: C:0.7%, Cu: 1.3%;Ni:4.5%;Mo:0.4% obtains metallurgical raw material remaining as Fe and inevitable impurity
(2) it shapes: metallurgical raw material obtained by step (1) being put into forming machine, is suppressed using 500T CNC shaping press, tooth hub Global density 7.05g/cm3, density 7.12g/cm at special-shaped keyway and tooth hub ontology dowel3;Each shaped segment segmentation density≤ 0.2g/cm3, each position junction flawless of green compact.Automatic burr brushing after green compact demoulding, obtains tooth hub.
(3) it is pre-sintered: taking step (2) to obtain tooth hub and be pre-sintered, 850 DEG C of sintering temperature, tooth hub must be pre-sintered.
(4) shaping: shaping is carried out by tooth hub is pre-sintered obtained by step (3), makes the relevant profile accuracy of tooth hub, form accuracy Meet technical requirements, obtains tooth hub after shaping.
(5) numerical control machines: tooth hub after shaping obtained by step (4) is carried out CNC machine appropriate according to tooth hub required precision Add cutting;
(6) deburring: burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, unhairing ratchet must be pre-sintered Hub;
(7) sinter-hardened: formed tooth hub obtained by step (6) being put into high temperature meshbeltfurnace and is sintered, is sintered 1120 DEG C of temperature, sintering atmosphere is ammonolysis craft protective atmosphere, and cooling velocity is 5 DEG C/S, obtains hardenite, obtains sinter-hardened tooth Hub;
(8) it is tempered: sinter-hardened 180 DEG C of tooth hub tempering, time 2 h, tooth hub after must being tempered obtained by step (7).
(9) local shot-peening: 6 special-shaped keyways of tooth hub after tempering obtained by step (8) are carried out close to tooth hub ontology root Bead.Shot peening strength 0.25mmA, coverage rate 150%, it is residual that the muscle portion that keyway is connect with tooth hub ontology obtains certain inside Overbottom pressure stress obtains shot-peening tooth hub.
(10) test package is put in storage: to shot-peening tooth hub obtained by step (9), being cleaned and is packed and stored.The main indicator of qualified product It is as follows:
The negative value compression of generation can offset the positive value tensile stress of identical numerical value, improve the tensile strength of tooth hub and resist tired Labor intensity increases the torsional strenght that product is born, and improves the fatigue resistance of tooth hub, increases the torque that product is born.
Embodiment 2: a kind of double clutch large torque automatic gear-box synchromesh gear hub method for preparing powder metallurgy include following Step:
(1) mixing: following raw materials are uniformly mixed by design raw material composition and mixing by mass percentage: C:0.5%, Cu: 1.7%;Ni:3.5%;Mo:0.6%% obtains powder metallurgy raw material remaining as Fe and inevitable impurity.
(2) it shapes: metallurgical raw material obtained by step (1) being put into forming machine, is suppressed using 500T CNC shaping press, tooth hub Global density 7.08g/cm3, density 7.11g/cm at special-shaped keyway and tooth hub ontology dowel3;Each shaped segment segmentation density≤ 0.2g/cm3, each position junction flawless of green compact.Automatic burr brushing after green compact demoulding, obtains tooth hub.
(3) it is pre-sintered: taking step (2) to obtain tooth hub and be pre-sintered, 850 DEG C of sintering temperature, tooth hub must be pre-sintered.
(4) shaping: shaping is carried out by tooth hub is pre-sintered obtained by step (3), makes the relevant profile accuracy of tooth hub, form accuracy Meet technical requirements, obtains tooth hub after shaping.
(5) numerical control machines: tooth hub after shaping obtained by step (4) is carried out CNC machine appropriate according to tooth hub required precision Add cutting.
(6) deburring: burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, unhairing ratchet must be pre-sintered Hub;
(7) sinter-hardened: tooth hub obtained by step (6) is put into high temperature meshbeltfurnace and is sintered, sintering temperature 1110 DEG C, sintering atmosphere is ammonolysis craft protective atmosphere, and cooling velocity is 2.5 DEG C/S, obtains hardenite, obtains sinter-hardened tooth Hub;
(8) it is tempered: sinter-hardened 180 DEG C of tooth hub tempering, time 2 h, tooth hub after must being tempered obtained by step (7).
(9) local shot-peening: 6 special-shaped keyways of tooth hub after tempering obtained by step (8) are carried out close to tooth hub ontology root Bead.Shot peening strength 0.20mmA, coverage rate 150%, it is residual that the muscle portion that keyway is connect with tooth hub ontology obtains certain inside Overbottom pressure stress obtains shot-peening tooth hub.
(10) test package is put in storage: to shot-peening tooth hub obtained by step (9), being cleaned and is packed and stored.The main indicator of qualified product It is as follows:
The negative value compression of generation can offset the positive value tensile stress of identical numerical value, improve the tensile strength of tooth hub and resist tired Labor intensity increases the torque that product is born.
Embodiment 3: a kind of double clutch large torque automatic gear-box synchromesh gear hub method for preparing powder metallurgy include following Step:
(1) mixing: following raw materials are uniformly mixed by design raw material composition and mixing by mass percentage: C:0.6%, Cu: 1.5%;Ni:4.0%;Mo:0.5% obtains metallurgical raw material remaining as Fe and inevitable impurity.
(2) it shapes: metallurgical raw material obtained by step (1) being put into forming machine, is suppressed using 500T CNC shaping press, tooth hub Global density 7.06g/cm3, density 7.13g/cm at special-shaped keyway and tooth hub ontology dowel3;Each shaped segment segmentation density≤ 0.2g/cm3, each position junction flawless of green compact.Automatic burr brushing after green compact demoulding, obtains tooth hub.
(3) it is pre-sintered: taking step (2) to obtain tooth hub and be pre-sintered, 850 DEG C of sintering temperature, tooth hub must be pre-sintered.
(4) shaping: shaping is carried out by tooth hub is pre-sintered obtained by step (3), makes the relevant profile accuracy of tooth hub, form accuracy Meet technical requirements, obtains tooth hub after shaping.
(5) numerical control machines: tooth hub after shaping obtained by step (4) is carried out CNC machine appropriate according to tooth hub required precision Add cutting;
(6) deburring: burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, unhairing ratchet must be pre-sintered Hub;
(7) sinter-hardened: tooth hub obtained by step (6) is put into high temperature meshbeltfurnace and is sintered, sintering temperature 1130 DEG C, sintering atmosphere is ammonolysis craft protective atmosphere, and cooling velocity is 3.5 DEG C/S, obtains hardenite;
(8) it is tempered: sinter-hardened 180 DEG C of tooth hub tempering, time 2 h, tooth hub after must being tempered obtained by step (7).
(9) local shot-peening: 6 special-shaped keyways of tooth hub after tempering obtained by step (8) are carried out close to tooth hub ontology root Bead.Shot peening strength 0.24mmA, coverage rate 150%, it is residual that the muscle portion that keyway is connect with tooth hub ontology obtains certain inside Overbottom pressure stress obtains shot-peening tooth hub.
(10) test package is put in storage: to shot-peening tooth hub obtained by step (9), being cleaned and is packed and stored.
The main indicator of qualified product is as follows:
The negative value compression of generation can offset the positive value tensile stress of identical numerical value, improve the tensile strength of tooth hub and resist tired Labor intensity increases the torque that product is born.

Claims (9)

1. a kind of powdered metallurgical material of double clutch large torque automatic gear-box synchromesh gear hubs, which is characterized in that the powder The constituent mass percentage of metallurgical material is C:0.5%-0.7%, Cu:1.3%-1.7%, Ni:3.5%-4.5%, Mo: 0.4%-0.6%, remaining as Fe and inevitable impurity.
2. powdered metallurgical material according to claim 1, which is characterized in that the constituent mass hundred of the powdered metallurgical material Dividing ratio is C:0.7%, Cu:1.3%, Ni:4.5%, Mo:0.4%, remaining as Fe and inevitable impurity.
3. powdered metallurgical material according to claim 1, which is characterized in that the constituent mass hundred of the powdered metallurgical material Dividing ratio is C:0.5%, Cu:1.7%, Ni:3.5%, Mo:0.6%, remaining as Fe and inevitable impurity.
4. powdered metallurgical material according to claim 1, which is characterized in that the constituent mass hundred of the powdered metallurgical material Dividing ratio is C:0.6%, Cu:1.5%, Ni:4.0%, Mo:0.5%, remaining as Fe and inevitable impurity.
5. powdered metallurgical material preparation method according to claim 1-4, which is characterized in that this method include with Lower step:
(1) mixing: each raw material composition and mixing are weighed by formula, obtains powder metallurgy raw material;
(2) it shapes: powder metallurgy raw material obtained by step (1) being put into compression moulding in the mold of forming machine, obtains tooth hub;
(3) it is pre-sintered, takes step (2) to obtain tooth hub and be pre-sintered, tooth hub must be pre-sintered;
(4) shaping: shaping is carried out by tooth hub is pre-sintered obtained by step (3), meets the relevant profile accuracy of tooth hub, form accuracy Technical requirements obtain tooth hub after shaping;
(5) numerical control machines: tooth hub after shaping obtained by step (4) being added according to tooth hub required precision progress CNC machine appropriate and is cut It cuts;
(6) deburring: burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, unhairing ratchet hub must be pre-sintered;
(7) sinter-hardened: by tooth hub obtained by step (6), to be put into high temperature continuous fritting furnace, be sintered in oxygen-free environment, then Air-blast quenching is carried out, sinter-hardened tooth hub is obtained;
(8) it is tempered: sinter-hardened 180 DEG C of tooth hub tempering, time 2 h, tooth hub after must being tempered obtained by step (7).
(9) local shot-peening: 6 of tooth hub special-shaped keyways are at the dowel of tooth hub ontology root after being tempered to step (8) gained Bead is carried out, shot-peening tooth hub is obtained;
(10) it cleans packaging: to shot-peening tooth hub obtained by step (9), cleaning packaging, both.
6. powdered metallurgical material preparation method according to claim 5, which is characterized in that step (2) described manufacturing process To be suppressed using 500T CNC shaping press, tooth hub global density >=7.0g/cm3, at special-shaped keyway and tooth hub ontology dowel Density >=7.1g/cm3, each shaped segment segmentation density≤0.2g/cm3
7. powdered metallurgical material preparation method according to claim 5, which is characterized in that step (3) the pre-burning junction temperature Degree is 850 DEG C.
8. powdered metallurgical material preparation method according to claim 5, which is characterized in that step (7) is described sinter-hardened Process are as follows: it is sintered and uses the sinter-hardened furnace of net belt type, 1120 DEG C ± 10 DEG C of sintering temperature, in 90/10N2/H2Sintering atmosphere Middle sintering 30-45min, using hydrogen as protective gas, air-blast quenching employs nitrogen as cooling medium, cooling oxygen-free environment Rate is about 2.5-5 DEG C/S.
9. powdered metallurgical material preparation method according to claim 5, which is characterized in that step (9) the local shot-peening Process are as follows: bead, shot peening strength 0.20 are carried out at the dowel of tooth hub ontology root to tooth hub 6 special-shaped keyways To 0.25mmA, coverage rate 150%, keyway connect muscle portion with tooth hub ontology and obtains certain internal residual compression.
CN201811616438.7A 2018-12-28 2018-12-28 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs Pending CN109852897A (en)

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