CN105268885A - Hot die forging and pressing process for sun wheel of automobile automatic gearbox - Google Patents
Hot die forging and pressing process for sun wheel of automobile automatic gearbox Download PDFInfo
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- CN105268885A CN105268885A CN201510699523.4A CN201510699523A CN105268885A CN 105268885 A CN105268885 A CN 105268885A CN 201510699523 A CN201510699523 A CN 201510699523A CN 105268885 A CN105268885 A CN 105268885A
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- sun gear
- automatic gearbox
- gear
- endoporus
- grinding
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Abstract
The invention provides a hot die forging and pressing process for a sun wheel of an automobile automatic gearbox. The process includes the following steps of (1) blank making, (2) spheroidizing annealing, (3) carburizing, (4) quenching and tempering, (5) accurate grinding of inner holes, (6) counter bore grinding, (7) end face grinding, (8) accurate grinding of outer circles, (9) gear honing and (10) polishing and anti-rust oil coating. The hot die forging and pressing process is used for machining and molding the sun wheel of the automobile automatic gearbox, the obtained sun wheel is high in precision, the cutting time is short, the machining cost is low, environment friendliness is achieved, energy is saved, and the allowance for machining is little.
Description
Technical field
The present invention relates to a kind of automatic gearbox of vehicles sun gear hot forging compression technology.
Background technology
Automatic gear-box is a kind of speed change gear that automatically can carry out self shifter manipulation according to automobile speed and engine speed occurred relative to manual transmission.Current automatic gearbox of vehicles common are four kinds of patterns, is hydraulic automatic gearbox (AT), mechanical stepless automatic gear-box (CVT), electric-controlled mechanical automatic gear-box (AMT) and double clutch automatic speed changing case respectively.
Planetary gear mechanism in automatic gear-box, comprises four elements: sun gear, planetary gear, planet carrier, ring gear.A sun gear and multiple planetary gear is there is in a planetary gears, export for sun gear input, planet carrier, sun gear will drive several planetary gear to rotate, due to the reason of processing, assembling, operating condition etc., the load that each planetary gear brings to sun gear there are differences, if sun gear adopts bearing spacing, be easy to cause load uneven and cause sun gear to damage.Therefore in the design, the floating setting that sun gear adopts bearing-free to support usually, regulating load by self floating in sun gear operation process, reaching the equilibrium of load between planetary gear, namely all carrying.Accordingly, the input of sun wheel shaft can not adopt the unbalance loading as parallel-axes gears group transmission and so on to input, and must adopt the input with sun wheel shaft coaxial rotation.
For the processing technology of sun gear, be generally forging technology, and it is more with hot forging in forging and stamping, hot forging, it is the one of Forging Technology technology, generally refer to after metal blank is heated above material re-crystallizes temperature, utilize mould by the precision forging method of metal blank Plastic Forming for forging shape and size.According to the difference having non-trimming, closed type hot die forging and open type hot forging can also be divided into.
Current domestic main existence is as follows about the processing technology of gearbox gear:
Patent publication No.: CN1229018, discloses a kind of method for making speed changer gear, and after blank, carry out recrystallization heating, in cooling procedure, controlled cooling model speed makes it hardness and meets Brinell hardness HB165 ~ 210.After this carry out turnery processing and the gear hobbing of tooth base, the gear after tooth punching is carried out induction hardening, the tempering of teeth portion, its hardness is regulated in the scope of Rockwell hardness HRC30 ~ 48.Proceed to machined and carry out shaving, finally carry out gas nitriding.Present invention achieves the high efficiency processing of gear, be aided with toughness nitriding by the Strengthening and Toughening process of matrix, make the intensity of nitriding gear exceed the level of 20CrMnTi steel carburizing and quenching.But this patented method is too simple, and generality is high, and the processing for sun gear does not describe specially.
Summary of the invention
For solving above-mentioned Problems existing, the object of the present invention is to provide a kind of automatic gearbox of vehicles sun gear hot forging compression technology, described hot forging compression technology adds machine-shaping for automobile gearbox sun gear, and gained sun gear precision is high, the cutting time is few, processing cost is low, environmental protection and energy saving, allowance are few.
For achieving the above object, technical scheme of the present invention is:
A kind of automatic gearbox of vehicles sun gear hot forging compression technology, comprises the steps:
1) base
Steel alloy for the manufacture of sun gear is heated to 1000 ~ 1100 DEG C, then puts into hotdie forging press and forge, obtain described sun gear blank;
2) spheroidizing
By step 1) gained sun gear blank takes out, is cooled to 800 ~ 850 DEG C, carries out spheroidizing process with the speed of 5 DEG C/min from hotdie forging press, after insulation 2 ~ 3h, is cooled to room temperature;
3) carburizing
Blank is put into carburizer, in carburizer, is heated to 900 ~ 950 DEG C, take out after insulation 10 ~ 15h, be cooled to room temperature;
4) quenching, tempering
Blank after Carburization Treatment is carried out Quenching Treatment, and hardening heat is 800 ~ 850 DEG C, after insulation 1 ~ 2h, be cooled to room temperature with the speed of 10 DEG C/min, then carry out temper, temperature 500 ~ 550 DEG C, after insulation 2 ~ 4h, be cooled to room temperature with the speed of 10 DEG C/min;
5) endoporus is refined
Adopt emery wheel fine grinding endoporus, diameter of bore 15mm, diameter of bore fine grinding error 0.01 ~ 0.02mm, grinding wheel diameter 10 ~ 15mm, grinding wheel speed 7500 turns/min, surfaces externally and internally axiality≤0.15mm;
6) counterbore is ground
To grind endoporus for benchmark, counter bore bit grinder is processed, grinds counterbore;
7) face grinding
Surface grinding machine grinds off black skin, and both ends of the surface parallelism error is less than 0.002mm;
8) fine cylindrical
Take endoporus as benchmark, at centerless grinder fine grinding blank cylindrical, outside diameter refines to 30mm, error-0.1 ~ 0.1mm;
9) gear honing
Gear honing machine carries out gear honing process, gear honing speed 1 ~ 3m/s, gear honing surplus≤0.025mm, top gem of a girdle-pendant wheel speed 1000 ~ 1100 turns/min, length feed amount 0.05 ~ 0.065mm/r;
10) polishing, painting antirust oil
Send into gear burnishing machine polishing, coating antirust oil, dry, obtain described sun gear.
Further, described sun gear steel is 20CrMnTi carburizing steel, and phosphorus content is 0.17 ~ 0.24wt%.
Separately, step 1) hotdie forging press used is 1600T hotdie forging press or 4000T hotdie forging press.
Separately have, step 1) described in forging adopt closed type hot die forging.
Again, step 3) carburizer used is kerosene.
Further, step 5) fine grinding endoporus after, endoporus roughness Ra is 0.4 ~ 0.8mm, endoporus cylindricity≤0.003mm.
And, step 8) after fine cylindrical, periphery roughness≤Rz1.0 μm, periphery to end face squareness≤0.001mm, periphery cylindricity≤0.001mm, circularity≤0.001mm.
Beneficial effect of the present invention is:
Described hot forging compression technology adds machine-shaping for automobile gearbox sun gear, gained sun gear precision is high, the cutting time is few, processing cost is low, environmental protection and energy saving, allowance are few, product processing quality is stablized, dimensional tolerance, convexity amount uniformity are good, drum-like shape good stability, surface roughness and circularity significantly improve, and enhance case hardness.
Detailed description of the invention
Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.The implementation condition adopted in embodiment can be for further adjustments according to the condition of producer, and unaccounted implementation condition is generally conventional laboratory conditions.
The invention provides a kind of automatic gearbox of vehicles sun gear hot forging compression technology, comprise the steps:
1) base
Steel alloy for the manufacture of sun gear is heated to 1000 ~ 1100 DEG C, then puts into hotdie forging press and forge, obtain described sun gear blank;
2) spheroidizing
By step 1) gained sun gear blank takes out, is cooled to 800 ~ 850 DEG C, carries out spheroidizing process with the speed of 5 DEG C/min from hotdie forging press, after insulation 2 ~ 3h, is cooled to room temperature;
3) carburizing
Blank is put into carburizer, in carburizer, is heated to 900 ~ 950 DEG C, take out after insulation 10 ~ 15h, be cooled to room temperature;
4) quenching, tempering
Blank after Carburization Treatment is carried out Quenching Treatment, and hardening heat is 800 ~ 850 DEG C, after insulation 1 ~ 2h, be cooled to room temperature with the speed of 10 DEG C/min, then carry out temper, temperature 500 ~ 550 DEG C, after insulation 2 ~ 4h, be cooled to room temperature with the speed of 10 DEG C/min;
5) endoporus is refined
Adopt emery wheel fine grinding endoporus, diameter of bore 15mm, diameter of bore fine grinding error 0.01 ~ 0.02mm, grinding wheel diameter 10 ~ 15mm, grinding wheel speed 7500 turns/min, surfaces externally and internally axiality≤0.15mm;
6) counterbore is ground
To grind endoporus for benchmark, counter bore bit grinder is processed, grinds counterbore;
7) face grinding
Surface grinding machine grinds off black skin, and both ends of the surface parallelism error is less than 0.002mm;
8) fine cylindrical
Take endoporus as benchmark, at centerless grinder fine grinding blank cylindrical, outside diameter refines to 30mm, error-0.1 ~ 0.1mm;
9) gear honing
Gear honing machine carries out gear honing process, gear honing speed 1 ~ 3m/s, gear honing surplus≤0.025mm, top gem of a girdle-pendant wheel speed 1000 ~ 1100 turns/min, length feed amount 0.05 ~ 0.065mm/r;
10) polishing, painting antirust oil
Send into gear burnishing machine polishing, coating antirust oil, dry, obtain described sun gear.
Further, described sun gear steel is 20CrMnTi carburizing steel, and phosphorus content is 0.17 ~ 0.24wt%.
Separately, step 1) hotdie forging press used is 1600T hotdie forging press or 4000T hotdie forging press.
Separately have, step 1) described in forging adopt closed type hot die forging.
Again, step 3) carburizer used is kerosene.
Further, step 5) fine grinding endoporus after, endoporus roughness Ra is 0.4 ~ 0.8mm, endoporus cylindricity≤0.003mm.
And, step 8) after fine cylindrical, periphery roughness≤Rz1.0 μm, periphery to end face squareness≤0.001mm, periphery cylindricity≤0.001mm, circularity≤0.001mm.
Described hot forging compression technology adds machine-shaping for automobile gearbox sun gear, gained sun gear precision is high, the cutting time is few, processing cost is low, environmental protection and energy saving, allowance are few, product processing quality is stablized, dimensional tolerance, convexity amount uniformity are good, drum-like shape good stability, surface roughness and circularity significantly improve, and enhance case hardness.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not depart from the scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Claims (7)
1. an automatic gearbox of vehicles sun gear hot forging compression technology, is characterized in that, comprise the steps:
Base
Steel alloy for the manufacture of sun gear is heated to 1000 ~ 1100 DEG C, then puts into hotdie forging press and forge, obtain described sun gear blank;
Spheroidizing
By step 1) gained sun gear blank takes out, is cooled to 800 ~ 850 DEG C, carries out spheroidizing process with the speed of 5 DEG C/min from hotdie forging press, after insulation 2 ~ 3h, is cooled to room temperature;
Carburizing
Blank is put into carburizer, in carburizer, is heated to 900 ~ 950 DEG C, take out after insulation 10 ~ 15h, be cooled to room temperature;
Quenching, tempering
Blank after Carburization Treatment is carried out Quenching Treatment, and hardening heat is 800 ~ 850 DEG C, after insulation 1 ~ 2h, be cooled to room temperature with the speed of 10 DEG C/min, then carry out temper, temperature 500 ~ 550 DEG C, after insulation 2 ~ 4h, be cooled to room temperature with the speed of 10 DEG C/min;
Fine grinding endoporus
Adopt emery wheel fine grinding endoporus, diameter of bore 15mm, diameter of bore fine grinding error 0.01 ~ 0.02mm, grinding wheel diameter 10 ~ 15mm, grinding wheel speed 7500 turns/min, surfaces externally and internally axiality≤0.15mm;
Mill counterbore
To grind endoporus for benchmark, counter bore bit grinder is processed, grinds counterbore;
Face grinding
Surface grinding machine grinds off black skin, and both ends of the surface parallelism error is less than 0.002mm;
Fine cylindrical
Take endoporus as benchmark, at centerless grinder fine grinding blank cylindrical, outside diameter refines to 30mm, error-0.1 ~ 0.1mm;
Gear honing
Gear honing machine carries out gear honing process, gear honing speed 1 ~ 3m/s, gear honing surplus≤0.025mm, top gem of a girdle-pendant wheel speed 1000 ~ 1100 turns/min, length feed amount 0.05 ~ 0.065mm/r;
Polishing, painting antirust oil
Send into gear burnishing machine polishing, coating antirust oil, dry, obtain described sun gear.
2. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, it is characterized in that, described sun gear steel is 20CrMnTi carburizing steel, and phosphorus content is 0.17 ~ 0.24wt%.
3. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, is characterized in that, step 1) hotdie forging press used is 1600T hotdie forging press or 4000T hotdie forging press.
4. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, is characterized in that, step 1) described in forging adopt closed type hot die forging.
5. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, is characterized in that, step 3) carburizer used is kerosene.
6. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, is characterized in that, step 5) fine grinding endoporus after, endoporus roughness Ra is 0.4 ~ 0.8mm, endoporus cylindricity≤0.003mm.
7. a kind of automatic gearbox of vehicles sun gear hot forging compression technology according to claim 1, it is characterized in that, step 8) after fine cylindrical, periphery roughness≤Rz1.0 μm, periphery is to end face squareness≤0.001mm, periphery cylindricity≤0.001mm, circularity≤0.001mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510699523.4A CN105268885A (en) | 2015-10-26 | 2015-10-26 | Hot die forging and pressing process for sun wheel of automobile automatic gearbox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510699523.4A CN105268885A (en) | 2015-10-26 | 2015-10-26 | Hot die forging and pressing process for sun wheel of automobile automatic gearbox |
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| CN105268885A true CN105268885A (en) | 2016-01-27 |
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| CN201510699523.4A Pending CN105268885A (en) | 2015-10-26 | 2015-10-26 | Hot die forging and pressing process for sun wheel of automobile automatic gearbox |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764838A (en) * | 2012-07-05 | 2012-11-07 | 无锡市钻通工程机械有限公司 | Gear thermal precision forging machining process adopting carburizing steel 20CrMnTi as material |
| CN103691958A (en) * | 2013-12-06 | 2014-04-02 | 无锡市德力流体科技有限公司 | Powdered metallurgical gear processing technology |
| CN103831599A (en) * | 2014-03-20 | 2014-06-04 | 重庆市坤津机械厂 | Machining method for hardened face gear |
| CN104858344A (en) * | 2015-05-19 | 2015-08-26 | 第一拖拉机股份有限公司 | Manufacturing method for large driving wheel forged pieces |
-
2015
- 2015-10-26 CN CN201510699523.4A patent/CN105268885A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764838A (en) * | 2012-07-05 | 2012-11-07 | 无锡市钻通工程机械有限公司 | Gear thermal precision forging machining process adopting carburizing steel 20CrMnTi as material |
| CN103691958A (en) * | 2013-12-06 | 2014-04-02 | 无锡市德力流体科技有限公司 | Powdered metallurgical gear processing technology |
| CN103831599A (en) * | 2014-03-20 | 2014-06-04 | 重庆市坤津机械厂 | Machining method for hardened face gear |
| CN104858344A (en) * | 2015-05-19 | 2015-08-26 | 第一拖拉机股份有限公司 | Manufacturing method for large driving wheel forged pieces |
Non-Patent Citations (2)
| Title |
|---|
| 天津齿轮机床研究所编: "《齿轮工手册 新版》", 31 October 1979, 天津科学技术出版社 * |
| 戴亚春主编: "《机械制造工艺实习指导》", 31 August 2007 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216429A (en) * | 2019-04-30 | 2019-09-10 | 兴化市统一齿轮有限公司 | A kind of automobile gearbox gear and its manufacturing method |
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Application publication date: 20160127 |
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