CN109702208A - A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique - Google Patents
A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique Download PDFInfo
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- CN109702208A CN109702208A CN201811616367.0A CN201811616367A CN109702208A CN 109702208 A CN109702208 A CN 109702208A CN 201811616367 A CN201811616367 A CN 201811616367A CN 109702208 A CN109702208 A CN 109702208A
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- hub
- speed changing
- double clutch
- automatic speed
- synchromesh gear
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Abstract
It includes: mixing step that the present invention, which provides a kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique, the production technology,；Forming step being put into compression moulding in the mold of forming machine including will prepare the alloy powder raw material completed, obtaining forming green compact；Sinter-hardened step, including green compact will be shaped be put into high temperature continuous fritting furnace and be sintered, then air-cooled tempering；Machining and post-processing step；Local shot-peening step, including tooth hub is handled using local shot-blast process.The production technology has the characteristics that at low cost, process flow is short, stock utilization is high, stable product quality and rejection rate are low.The edge teeth that the double clutch automatic speed changing case synchromesh gear hub will be close to special-shaped keyway is thinned from the unilateral tip relief on full teeth side, and the tooth hub after tip relief assembles the stucking phenomena that smooth, self-sliping is good, during effective solution tooth hub threading tooth set with tooth set.
Description
Technical field
The present invention relates to powder metallurgy automobile parts technical field, in particular to a kind of double clutch automatic speed changing case is synchronous
Device tooth hub and its powder metallurgically manufacturing technique.
Background technique
With the continuous development and raising of automotive engineering, driver and passenger are higher and higher to the comfort requirement of automobile, for
Shifting comfort directly affects vehicle comfort requirement for gearbox.Double-clutch automatic gearbox does not have traditional automatic transmission
Fluid torque-converter, it is one kind of automatic speed changer for machine, it has two power output shafts, one clutch of a company, one
1357 grades of control, another 246 reverse gear of control, in entire shift process, when one group of gear is in output power, another group of tooth
Wheel has been awaited orders, and is always maintained one group of gear in output power, is not in the interruption of power transmitting, makes shift process more
Fastly, it raises speed swifter and more violent.Due to there is no power interruption in torque transmittance process, while promoting shifting comfort, significantly drop
Low vehicle fuel consumption, double clutches represent the developing direction of automatic gear-box.Tooth hub is the important of double-clutch automatic gearbox
Self-sliping after part, tooth hub and tooth set assembly directly affects the shift performance of gearbox.Double clutch automatic speed changing case synchronizer
Tooth hub is typical H-type complex structural member, has complicated more mesa structures and thin-walled section, and external gear teeth has multiple special-shaped keys
Slot.
The gear shifting box synchronizer gear hub of powder metallurgy usual technique production, due to the presence of tooth hub external gear teeth abnormal shape keyway,
The special-shaped nearest edge teeth in keyway two sides after pressing green compact rebound, sintering after teeth portion deform, tooth hub put into tooth be cased with stucking phenomena,
Tooth hub effect free to slide in tooth set is not achieved, influences the performance of synchronizer assembly.It is same that the prior art produces powder metallurgy
Walk the production technology of device tooth hub are as follows: mixing → forming → sintering → shaping → machining → high-frequency quenching → tempering → magnetic powder inspection
Full inspection crackle → demagnetization → clean dry → test package.The prior art is in order to reach the mechanical property requirements of product, raw material one
As using containing nickelic high molybdenum D32 material standard, material cost it is very high.Prior art is corrected size by shaping after sintering and is become
Shape improves product points hardness by high-frequency quenching, and process flow is long, and unstable product quality, especially high-frequency quenching heat are rushed
Hitting generation high stress makes the deformation of tooth hub, generates localized cracks, influences Product Precision and functionality.Double clutches are without traditional from speed change
The fluid torque-converter of device, when synchronizer works, each special-shaped keyway of tooth hub, by larger tensile stress, is easy close to tooth hub ontology root
The fracture of tooth hub is caused more than tensile strength.The prior art cannot fundamentally solve these failure risks.
Therefore, a new synchromesh gear hub and its powder metallurgically manufacturing technique how are designed, meets double clutches and becomes automatically
The requirement of fast case synchromesh gear hub becomes the problem of urgent need to resolve.
Summary of the invention
Problems solved by the invention is to provide a kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing
Technique, comprising the following steps:
A) mixing step, including alloyage powder raw material；
B) forming step being put into compression moulding in the mold of forming machine including will prepare the alloy powder raw material completed, obtaining
To forming green compact；
C) sinter-hardened step, including green compact will be shaped and be put into high temperature continuous fritting furnace, it is sintered in oxygen-free environment,
Then air-cooled tempering is carried out, sintering tooth hub is obtained；
D) machining and post-processing step, including will be sintered tooth hub and be fixed on lathe, be machined out to meeting finished product
The requirement of drawing size and shape；Then it is post-processed, tooth hub after machining is brushed including the use of tooth hub deburring special plane
Then burr carries out demagnetization processing；
E) local shot-peening step, including tooth hub is handled using local shot-blast process.
Optionally, alloy powder raw material described in step a) includes the C of 0.4-0.6wt%, the Mo of 0.4-0.6wt%,
The lubricant of the Cr of 2.7-3.3wt%, 0.54-0.66wt%, surplus Fe.
Optionally, forming machine described in step b) is 500T CNC molding machine, shaping density >=7.00g/cm3, each to shape
Section segmentation density≤0.2g/cm3, automatic burr brushing after green compact demoulding.
Optionally, high temperature continuous fritting furnace described in step c) is the sinter-hardened furnace of net belt type, and sintering temperature is in 1110-
Within the scope of 1130 DEG C, the oxygen-free environment is N2/H2=9 ammonolysis craft protective atmosphere, sintering time is within the scope of 30-45min.
Optionally, the air-cooled tempering employs nitrogen as cooling medium, and cooling rate is 2.5-5 DEG C/s.
Optionally, the intensity requirement of part shot-peening described in step e) is 0.2-0.25mmA, coverage rate 150%.
Optionally, the double clutch automatic speed changing case synchromesh gear hub includes tooth hub ontology C, the plane on the splined hole of center
A and plane b, external gear teeth abnormal shape keyway edge teeth 1, external gear teeth orthodont 2, special-shaped keyway 3 and special-shaped keyway 4, center splined hole
5；The edge teeth of the abnormal shape keyway is thinned from the unilateral tip relief on full teeth side.
Optionally, the tip relief is thinned to move ￠ 0.3 to keyway direction+0.1 0mm。
Compared with prior art, technical solution provided by the invention has the advantage that
The present invention is produced using powder metallurgy sintered hardening process, can save shaping and quenching technology, by adjusting
Low-alloy steel ingredient, by sintering process cooling stage and heat treatment in quenching technical organically combine, use is air-cooled
Tempering, to make sintering tooth hub that can obtain the mechanical property of high intensity and hardness without special heat treatment procedure, expire
Sufficient drawing standard requirement not only reduces cost, and avoids the thermal shock quenched in heat treatment to tooth hub part and generate
High stress makes that part deformation is big, is easy to produce the disadvantages of crackle, to improving tooth hub tooth form and dimensional accuracy, reduce crackle risk etc.
Aspect is largely effective, while decreasing the technique that dimensional accuracy is corrected in subsequent shaping.The present invention takes local shot-blast process to increase
Add 6 special-shaped keyways close to the residual compressive stress of tooth hub ontology root, with partial offset work in where place's generation tensile stress
Improve fatigue life, it is ensured that tooth hub intensity avoids tensile stress excessive and tooth hub is caused to be broken.The present invention is to synchromesh gear hub close to different
6 edge teeths of type keyway carry out unilateral tip relief, and the tooth hub and tooth set after tip relief assemble that smooth, self-sliping is good.
Detailed description of the invention
Fig. 1 is one embodiment of the invention double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing process flow signal
Figure；
Fig. 2 is top view, sectional view along A-A and the B of one embodiment of the invention double clutch automatic speed changing case synchromesh gear hub
Area's partial enlarged view.
Specific embodiment
It can be seen from background technology that the process flow for preparing gear shifting box synchronizer gear hub is long, unstable product quality, product
Precision is to be improved, and tooth hub effect free to slide in tooth set is not achieved in gear shifting box synchronizer gear hub at present.
There are the reason of above problem to include: for analysis
The production technology of prior art production powder metallurgy synchronizer tooth hub are as follows: mixing → forming → sintering → shaping → machine
Processing → high-frequency quenching → tempering → magnetic powder inspection full inspection crackle → demagnetization → clean dry → test package.The prior art in order to
Reach the mechanical property requirements of product, raw material is generally very high using D32 material standard, material cost containing nickelic high molybdenum.For
Size distortion is corrected by shaping after sintering, product points hardness is improved by high-frequency quenching, process flow is long, product quality
Unstable, especially high-frequency quenching thermal shock generates high stress and makes the deformation of tooth hub, generates localized cracks, influences Product Precision and function
It can property.And due to the presence of tooth hub external gear teeth abnormal shape keyway, the special-shaped nearest edge teeth in keyway two sides after pressing green compact rebound,
Teeth portion deforms after sintering, and tooth hub puts into tooth and is cased with stucking phenomena, therefore tooth hub effect free to slide in tooth set is not achieved.
To solve the above-mentioned problems, the present invention provides a kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgy
Manufacturing process can be improved preparation efficiency and improve the performance of synchromesh gear hub.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
One embodiment of the invention double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing is shown with reference to Fig. 1, Fig. 1
Process flow diagram.Specifically, including following basic step:
A) mixing step, including alloyage powder raw material；
B) forming step being put into compression moulding in the mold of forming machine including will prepare the alloy powder raw material completed, obtaining
To forming green compact；
C) sinter-hardened step, including green compact will be shaped and be put into high temperature continuous fritting furnace, it is sintered in oxygen-free environment,
Then air-cooled tempering is carried out, sintering tooth hub is obtained；
D) machining and post-processing step, including will be sintered tooth hub and be fixed on lathe, be machined out to meeting finished product
The requirement of drawing size and shape；Then it is post-processed, tooth hub after machining is brushed including the use of tooth hub deburring special plane
Then burr carries out demagnetization processing；
E) local shot-peening step, including tooth hub is handled using local shot-blast process.
Below in conjunction with attached drawing, the present invention will be further described.
With reference to Fig. 1, step a), alloyage powder raw material are executed.
In the present invention, the alloy powder raw material includes the C of 0.4-0.6wt%, the Mo of 0.4-0.6wt%, 2.7-
The lubricant of the Cr of 3.3wt%, 0.54-0.66wt%, surplus Fe.
The chromium that the present invention selects price low and stable replaces the pure nickel and molybdenum that price is unstable and price is high, while adding few
Measure molybdenum pre-alloying powder be sinter-hardened raw material, than the D32 material standard generallyd use tooth hub raw material in equal conditions
Lower 20% or more cost decline.
With reference to Fig. 1, step b) is executed, the alloy powder raw material for preparing completion is put into the mold of forming machine and is pressed into
Shape obtains forming green compact.
The used forming machine of the present invention is 500T CNC molding machine, and shaping density is more than or equal to 7.00g/cm3, each shaped segment
Divide density and is less than or equal to 0.2g/cm3, automatic burr brushing after green compact demoulding.
With reference to Fig. 1, step c) is executed, forming green compact are put into high temperature continuous fritting furnace, are sintered in oxygen-free environment,
Then air-cooled tempering is carried out, sintering tooth hub is obtained.The high temperature continuous fritting furnace is the sinter-hardened furnace of net belt type, and sintering temperature exists
Within the scope of 1110-1130 DEG C, the oxygen-free environment is N2/H2=9 ammonolysis craft protective atmosphere, sintering time is in 30-45min model
In enclosing.The air-cooled tempering employs nitrogen as cooling medium, and cooling rate is 2.5-5 DEG C/s.Using sinter-hardened technique, produce
Product deform mechanical property that is small, obtaining higher hardness and strength, can exempt and correct deformation of products subsequently through shaping process, lead to
Cross the complex process flow that local high-frequency quenching improves hardness and strength.
With reference to Fig. 1, step d) is executed, sintering tooth hub is fixed on lathe, is machined out to meeting finished product drawing ruler
Very little and shape need；Then it is post-processed, burr brushing is carried out to tooth hub after machining including the use of tooth hub deburring special plane, so
After carry out demagnetization processing.
With reference to Fig. 1, step e) is executed, tooth hub is handled using local shot-blast process.The intensity requirement of the shot-peening is 0.2-
0.25mmA, coverage rate 150%.Local shot-blast process can effectively increase each special-shaped keyway close to the residual of tooth hub ontology root
Overbottom pressure stress, partial offset work in where place generate tensile stress, improve fatigue life, it is ensured that tooth hub intensity, avoid drawing answer
Power is excessive and tooth hub is caused to be broken.
With reference to Fig. 2, Fig. 2 shows top view, the A-A of one embodiment of the invention double clutch automatic speed changing case synchromesh gear hub
To cross-sectional view and the area B partial enlarged view.The double clutch automatic speed changing case of the powder metallurgically manufacturing technique manufacture according to the present invention
Synchromesh gear hub includes tooth hub ontology C, the plane a on the splined hole of center and plane b, external gear teeth abnormal shape keyway edge teeth 1, foreign steamer
Tooth orthodont 2, special-shaped keyway 3 and special-shaped keyway 4, center splined hole 5；List of the edge teeth of the abnormal shape keyway from full teeth side
Side tip relief is thinned.The tip relief is thinned to move ￠ 0.3 to keyway direction+0.1 0mm.Tooth hub after tip relief and tooth set assembly it is smooth,
Self-sliping is good, can improve the assembly efficiency of tooth hub and tooth set.The double clutch automatic speed changing case synchromesh gear hub density >=7.0g/
cm3, it is sintered rear surface hardness >=325HV5, centre hardness is within the scope of 280+80HV10.Minimum residual compressive stress after shot-peening:
Depth 3-5um, stress -500Mpa；Depth 50um, stress -700Mpa；Depth 100um, stress -400Mpa.
Embodiment 1
(1) mixing: following raw materials are uniformly mixed by mass percentage: the Mo of the C of 0.6wt%, 0.5wt%, 3wt%'s
The lubricant of Cr, 0.56wt%, surplus Fe；
(2) shape: the powder metallurgy raw material that preparation finishes is put into the mold of forming machine by selection 500T CNC shaping press
Middle compression moulding, shaping density 7.10g/cm3, each position junction flawless of green compact, automatic burr brushing after green compact demoulding；
(3) sinter-hardened: forming green compact are put into high temperature meshbeltfurnace and are sintered, 1120 DEG C of sintering temperature,
Sintering atmosphere is the N of non-oxidation2/H2=9 ammonolysis craft protective atmosphere, then air-cooled tempering, cooling velocity are 2.6 DEG C/S, are obtained
It is sintered tooth hub；
(4) it machines and post-processes: sintering tooth hub is fixed on CNC lathe, is carried out a small amount of machining to meeting
The requirement of finished product drawing size and shape；Burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, is then moved back
Magnetic treatment；
(7) tooth hub, intensity 0.23mmA, coverage rate 150% local shot-peening: are handled using local shot-blast process；
Quality testing is carried out to obtained tooth hub, as a result as follows:
Embodiment 2
(1) mixing: following raw materials are uniformly mixed by mass percentage: the Mo of the C of 0.6wt%, 0.4wt%, 3.1wt%
Cr, the lubricant of 0.62wt%, surplus Fe；
(2) shape: the powder metallurgy raw material that preparation finishes is put into the mold of forming machine by selection 500T CNC shaping press
Middle compression moulding, shaping density 7.00g/cm3, each position junction flawless of green compact, automatic burr brushing after green compact demoulding；
(3) sinter-hardened: forming green compact are put into high temperature meshbeltfurnace and are sintered, 1120 DEG C of sintering temperature,
Sintering atmosphere is the N of non-oxidation2/H2=9 ammonolysis craft protective atmosphere, then air-cooled tempering, cooling velocity are 4 DEG C/S, are burnt
Tie tooth hub；
(4) it machines and post-processes: sintering tooth hub is fixed on CNC lathe, is carried out a small amount of machining to meeting
The requirement of finished product drawing size and shape；Burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, is then moved back
Magnetic treatment；
(7) tooth hub, intensity 0.25mmA, coverage rate 150% local shot-peening: are handled using local shot-blast process；
Quality testing is carried out to obtained tooth hub, as a result as follows:
Embodiment 3
(1) mixing: following raw materials are uniformly mixed by mass percentage: the Mo of the C of 0.46wt%, 0.56wt%,
The lubricant of the Cr of 2.9wt%, 0.59wt%, surplus Fe；
(2) shape: the powder metallurgy raw material that preparation finishes is put into the mold of forming machine by selection 500T CNC shaping press
Middle compression moulding, shaping density 7.3g/cm3, each position junction flawless of green compact, automatic burr brushing after green compact demoulding；
(3) sinter-hardened: forming green compact are put into high temperature meshbeltfurnace and are sintered, 1120 DEG C of sintering temperature,
Sintering atmosphere is the N of non-oxidation2/H2=9 ammonolysis craft protective atmosphere, then air-cooled tempering, cooling velocity are 4.2 DEG C/S, are obtained
It is sintered tooth hub；
(4) it machines and post-processes: sintering tooth hub is fixed on CNC lathe, is carried out a small amount of machining to meeting
The requirement of finished product drawing size and shape；Burr brushing is carried out to tooth hub after machining using tooth hub deburring special plane, is then moved back
Magnetic treatment；
(7) tooth hub, intensity 0.24mmA, coverage rate 150% local shot-peening: are handled using local shot-blast process；
Quality testing is carried out to obtained tooth hub, as a result as follows:
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (8)
1. a kind of double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique, which comprises the following steps:
A) mixing step, including alloyage powder raw material；
B) forming step being put into compression moulding in the mold of forming machine including will prepare the alloy powder raw material completed, obtaining into
Shape green compact；
C) sinter-hardened step, including green compact will be shaped and be put into high temperature continuous fritting furnace, it is sintered in oxygen-free environment, then
Air-cooled tempering is carried out, sintering tooth hub is obtained；
D) machining and post-processing step, including will be sintered tooth hub and be fixed on lathe, be machined out to meeting finished product drawing
Size and shape requirement；Then it is post-processed, burr brushing is carried out to tooth hub after machining including the use of tooth hub deburring special plane,
Then demagnetization processing is carried out；
E) local shot-peening step, including tooth hub is handled using local shot-blast process.
2. double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique according to claim 1, feature exist
In, alloy powder raw material described in step a) include the C of 0.4-0.6wt%, the Mo of 0.4-0.6wt%, 2.7-3.3wt%'s
The lubricant of Cr, 0.54-0.66wt%, surplus Fe.
3. double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique according to claim 1, feature exist
In forming machine described in step b) is 500T CNC molding machine, shaping density >=7.00g/cm3, each shaped segment segmentation density≤
0.2g/cm3, automatic burr brushing after green compact demoulding.
4. double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique according to claim 1, feature exist
In, high temperature continuous fritting furnace described in step c) be the sinter-hardened furnace of net belt type, sintering temperature within the scope of 1110-1130 DEG C,
The oxygen-free environment is N2/H2=9 ammonolysis craft protective atmosphere, sintering time is within the scope of 30-45min.
5. double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique according to claim 1, feature exist
In the air-cooled tempering employs nitrogen as cooling medium, and cooling rate is 2.5-5 DEG C/s.
6. double clutch automatic speed changing case synchromesh gear hub powder metallurgically manufacturing technique according to claim 1, feature exist
In the intensity requirement of part shot-peening described in step e) is 0.2-0.25mmA, coverage rate 150%.
7. the double clutch automatic speed changing case synchromesh gear hub of powder metallurgically manufacturing technique preparation according to claim 1,
It is characterized in that, the double clutch automatic speed changing case synchromesh gear hub includes tooth hub ontology (C), the plane (a) on the splined hole of center
With plane (b), external gear teeth abnormal shape keyway edge teeth (1), external gear teeth orthodont (2), special-shaped keyway (3) and abnormal shape keyway (4), in
Disc flower keyhole (5)；The edge teeth of the abnormal shape keyway is thinned from the unilateral tip relief on full teeth side.
8. double clutch automatic speed changing case synchromesh gear hub according to claim 7, which is characterized in that the tip relief, which is thinned, is
To the mobile ￠ 0.3 in keyway direction+0.1 0mm。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108994306A (en) * | 2018-07-27 | 2018-12-14 | 广东东睦新材料有限公司 | A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub |
| CN111390165A (en) * | 2020-01-16 | 2020-07-10 | 江苏智造新材有限公司 | Sintering and hardening process for blank of built-in flywheel of automobile clutch |
| CN112743078A (en) * | 2019-10-30 | 2021-05-04 | 江苏智造新材有限公司 | Automobile hybrid gearbox clutch inner hub and preparation method thereof |
| CN115889785A (en) * | 2022-09-15 | 2023-04-04 | 浙江迅达工业科技股份有限公司 | Application of Cr-containing alloy element powder material to gearbox synchronizer gear hub |
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| 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 |
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| CN102000825A (en) * | 2009-09-02 | 2011-04-06 | 东睦新材料集团股份有限公司 | Method for manufacturing driving gear of motorcycle clutch |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108994306A (en) * | 2018-07-27 | 2018-12-14 | 广东东睦新材料有限公司 | A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub |
| CN112743078A (en) * | 2019-10-30 | 2021-05-04 | 江苏智造新材有限公司 | Automobile hybrid gearbox clutch inner hub and preparation method thereof |
| CN111390165A (en) * | 2020-01-16 | 2020-07-10 | 江苏智造新材有限公司 | Sintering and hardening process for blank of built-in flywheel of automobile clutch |
| CN115889785A (en) * | 2022-09-15 | 2023-04-04 | 浙江迅达工业科技股份有限公司 | Application of Cr-containing alloy element powder material to gearbox synchronizer gear hub |
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Application publication date: 20190503 |