CN102825255A - Production method for drive shaft of powder metallurgy planetary gear - Google Patents
Production method for drive shaft of powder metallurgy planetary gear Download PDFInfo
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- CN102825255A CN102825255A CN2012103553178A CN201210355317A CN102825255A CN 102825255 A CN102825255 A CN 102825255A CN 2012103553178 A CN2012103553178 A CN 2012103553178A CN 201210355317 A CN201210355317 A CN 201210355317A CN 102825255 A CN102825255 A CN 102825255A
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- planetary gear
- power transmission
- transmission shaft
- powder metallurgy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/082—Planet carriers
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Abstract
The invention discloses a production method for a drive shaft of a powder metallurgy planetary gear. The method comprises the following steps of: (1) mixing powder; (2) pressing; (3) sintering; (4) processing; (5) heat treating; and (6) finishing. According to the invention, the structure of a powder metallurgy die is changed, i.e. the thickness of a planetary wheel disk of a pressing blank is increased during the pressing, so that a planetary wheel shaft hole of the pressing blank is changed into a blind hole; and the allowance thickness increased by a planetary wheel disk lock is removed from the other side of mounting a planetary wheel after sintering and shaping, so that the requirements on the shape and the size of the planetary wheel shaft hole are met during component design. The planetary wheel shaft hole is directly formed in a pressing manner by utilizing powder metallurgy, thereby ensuring the precision of the size and the shape position of the planetary wheel shaft hole and improving the density uniformity of the pressing blank around the planetary wheel shaft hole so as to overcome the defects of cracks and the like caused by the sintering.
Description
Technical field
The present invention relates to a kind of production technology of powder metallurgy, particularly a kind of manufacturing approach of powder metallurgy planetary gear power transmission shaft.
Background technology
In reducing gear family, planetary gear speed reducing mechanism is little with its compact conformation, volume, and transmission efficiency is high; Reduction range is wide, and running is steadily reliable, and overload capacity is strong; Shock-resistant, moment of inertia is little, is applicable to plurality of advantages such as the frequent and rotating running of starting and obtains to use widely; Its effect is exactly under the prerequisite that guarantees precision drive, mainly is used to reduce rotating speed and increases moment of torsion and the rotary inertia ratio that reduces load/motor.
Power transmission shaft is the core component of planetary gear speed reducing mechanism medium power output; Because it is long-pending that the power output of reductor is drive motors power output and speed reducing ratio; Higher reducing gear power output causes power transmission shaft to bear bigger moment of torsion and is prone to fractureed; So except that requiring higher size shape precision such as concentricity, simultaneously its case hardness, anti-wear performance, whole obdurability and fatigue strength performance are had higher requirement.
PM technique be produce metal or with metal dust (or mixture of metal dust and non-metal powder) as raw material, through being shaped and sintering, make the technology of metal material, compound and all kinds goods.Powder metallurgy have utilization rate of raw materials height (>=95%) but, advantage such as low cost of manufacture, the comprehensive good near-net-shape of material, product precision be high and stable, also can make material and unmanageable part that conventional cast method and machining process can't prepare.Planetary gear power transmission shaft class is a kind of comparatively complicated parts, adopts PM technique production can greatly reduce assembling and processing cost.
Shown in Figure 1 is a kind of powder metallurgy planetary gear power transmission shaft, and an end of power transmission shaft is the splined shaft 1 with centre bore 4, and its other end is a planet wheel disc 2, is suppressed with equally distributed planetary gear axis hole 3 on the said planet wheel disc 2.Because the compact dimensions of planetary gear speed reducing mechanism, the size of the planet wheel disc 2 of planetary gear power transmission shaft is certain, but also will guarantee that planetary gear axis hole 3 has certain wall thickness, and the outline line of planetary gear axis hole 3 extends on it is axial, must conflict with splined shaft 1.Fig. 2,3 can clearly be seen that this problem, is embodied in: axial along splined shaft 1, planetary gear axis hole 3 is overlapped with splined shaft 1.
In PM technique, above-mentioned design of part causes the planetary gear shaft hole of planetary gear power transmission shaft to be difficult to direct press forming.In order to make this kind power transmission shaft, the present practice is: with a compression moulding of power transmission shaft, but this power transmission shaft does not have the planetary gear axis hole, processes planetary gear axis hole 3 through subsequent handling then, the final power transmission shaft that obtains to have planetary gear axis hole 3.
But there is following problem in above-mentioned production technology: a plurality of planetary gear axis holes 3 are not one-time formed; In the following process process, be difficult to guarantee the dimensional accuracy and the positional precision of planetary gear axis hole 3 and center transmission shaft line:, but also will also the higher depth of parallelism and dimensional accuracy will be arranged with the center transmission shaft line even planetary gear axis hole 3 not only has the higher depth of parallelism and dimensional accuracy each other.Planet wheel spindle 5 is to press 3 backs, people's planet wheel spindle hole that planetary gear is installed through interference fit; If planetary gear axis hole 3 axially can not satisfy above-mentioned size and positional precision; Then have a strong impact on planetary engagement; To when work, greatly influence transmission of power, and send very big noise, the serious planetary life-span of reduction causes planetary gear speed reducing mechanism to be scrapped simultaneously.
Summary of the invention
Technical problem to be solved by this invention provides a kind of manufacturing approach of powder metallurgy planetary gear power transmission shaft, and this manufacturing approach has been guaranteed the precision of the size and dimension position of planetary gear power transmission shaft upper planet wheel axis hole.
In order to solve above-mentioned technical problem, technical scheme of the present invention is: a kind of manufacturing approach of powder metallurgy planetary gear power transmission shaft may further comprise the steps:
(1) powder metallurgy die design: for guaranteeing the structural compactness of planetary reducer; Under the constant situation of planet gearing shaft overall dimensions; Through changing the powder metallurgy die structure; The planetary gear disc thickness of compacting back planetary gear power transmission shaft pressed compact is H+h, and wherein H is the planet wheel disc design thickness of planetary gear power transmission shaft, the surplus thickness of h on the planetary gear dish, increasing; Have the planetary gear axis hole on the planet wheel disc, said planetary gear axis hole is a blind hole, and its opening is on the planetary gear installed surface of planetary gear dish, and its degree of depth is H1, and wherein, H≤H1＜(H+h), the size of surplus thickness h is 0.8-1.5 a times of splined shaft pressed compact thickness.Above-mentioned qualification to the surplus thickness range is designed with when being beneficial to the pressed compact compacting and obtains the uniform pressed compact of density, has avoided defectives such as pressed compact cracks in sintering process subsequently because of part wall thickness difference pressed density when excessive is uneven at place, planet wheel spindle hole.
(2) mixed-powder: evenly mix for use with auxiliary materials such as lubricant, binders by proportioning the powder metallurgy iron-based powder;
(3) compacting: the quantitative powder that mixes is sent in the die cavity of powder metallurgy planetary gear power transmission shaft on the press, be pressed into planetary gear power transmission shaft pressed compact;
(4) sintering:, planetary gear power transmission shaft pressed compact is sent into cracked ammonium or nitrogen atmosphere net strip sintering furnace sintering according to setting sintering process parameter;
(5) processing: remove the surplus thickness h of planet wheel disc from the splined shaft side of planetary gear power transmission shaft, the surplus thickness h partly is processed into splined shaft, the planetary gear axis hole of acquisition is a through hole;
(6) heat treatment: adopt carbo-nitriding in the box heat-treatment furnace, then at the quenching oil quenching, last lonneal is to guarantee the case hardness and the fatigue performance of powder metallurgy planetary gear power transmission shaft.
(7) polishing; On grinder, grind to obtain the product of final size precision.
Production technology of the present invention has solved the problem that planetary gear power transmission shaft that the present invention mentions can not a compression moulding, with the planetary gear axis hole through powder metallurgy directly compacting form, thereby guarantee the precision of size and dimension position, simultaneously.In the traditional handicraft, the planetary gear axis hole is formed by subsequent machining technology, and processing technology size and morpheme error are unavoidable, thereby can not guarantee the size and the accuracy of form and position of part.Planetary gear axis hole of the present invention directly compacting forms, and has solved the machining accuracy problem of subsequent handling, reduces manufacturing cost, improves the efficient of processing.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation.
Fig. 1 is the structural representation of planetary gear power transmission shaft.
Fig. 2 is the cutaway view of planetary gear power transmission shaft.
Fig. 3 is the side view of planetary gear power transmission shaft.
Fig. 4 is the structural representation that planetary gear planet wheel disc increases the power transmission shaft of thickness surplus.
Fig. 5 is the profile without processing planetary gear power transmission shaft.
The specific embodiment
Powder metallurgy planetary gear power transmission shaft production craft step of the present invention is following:
1) powder metallurgy die design: under the constant situation of planet gearing shaft overall dimensions; Making planet wheel disc 2 thickness through compacting back planetary gear power transmission shaft pressed compact is H+h; Wherein H is the planet wheel disc design thickness of planetary gear power transmission shaft; The surplus thickness of h on the planetary gear dish, increasing, as shown in Figure 4; Planet wheel disc 2 upper planet wheel axis holes 3 are blind hole, and its opening is on the planetary gear installed surface of planetary gear dish 2, and its degree of depth is H1, wherein, and H≤H1＜(H+h).For example, as shown in Figure 5, desire obtains the thick planet wheel disc of 6.2mm, and the thickness that compacting back pressed compact planet wheel disc 2 obtains is 15.3mm (comprising surplus thickness), and blind hole depth is 9.6mm, and the wall thickness of splined shaft 1 is 4mm, and dimensional units is mm among the figure.
This step is the key point of technology of the present invention; The surplus thickness 6 that adds makes the power transmission shaft that has planetary gear axis hole 3 directly to suppress; Guarantee that planetary gear axis hole 3 forms through the direct compacting of powder metallurgy, planetary gear axis hole 3 is avoided subsequent handling processing, guarantees the accuracy of its size and position.Different with the planetary gear power transmission shaft of design is that pressed compact upper planet wheel axis hole 3 is blind holes, and the length of splined shaft 1 shorten (overall dimensions of part does not become, and the surplus thickness 6 of increase has taken the position of splined shaft 1).
2) mixed-powder: evenly mix for use by proportioning iron-based powder.
3) compacting: send into press to the iron-based powder that mixes, accomplish by press iron-based powder is sent into preset product mold, and be pressed into the power transmission shaft blank.
4) sintering: the power transmission shaft blank is sent into sintering furnace sinter semi-finished articles into.
5) processing: the surplus thickness that increases by 6 processing are milled from splined shaft 1 side of power transmission shaft; Remove the surplus thickness 6 of planet wheel disc; The surplus thickness h partly is processed into splined shaft 1, generally, is that splined shaft 1 " is returned " in the position that the surplus thickness 6 that increases takies splined shaft 1; This moment, the size of splined shaft 1 was elongated, finally reached designing requirement.
Because the degree of depth of blind hole is deep into surplus thickness 6 positions, therefore the planetary gear axis hole 3 of processing back acquisition is a through hole.As shown in Figure 5, the hole depth of planetary gear axis hole 3 is 9.6mm, from splined shaft 1 side processing remove 9.1mm thick after, planetary gear axis hole 3 will become through hole.
(6) heat treatment: adopt carbo-nitriding in the box heat-treatment furnace, then at the quenching oil quenching, last lonneal is to guarantee the case hardness and the fatigue performance of powder metallurgy planetary gear power transmission shaft.
(7) polishing: on grinder, grind to obtain the product of final size precision.
The planetary gear axis hole 3 of technology of the present invention is directly suppressed through powder metallurgy and is formed; Take the opposite face of the low relatively planetary gear installed surface of required precision is processed; Guaranteed the precision of size and dimension position; Improved the density uniformity of pressed compact around in the planet wheel spindle hole simultaneously, the defectives such as crackle when having avoided sintering.On the other hand, low with respect to concerning the processing of planetary gear axis hole 3 to the requirement on machining accuracy of removing surplus thickness 6, enhance productivity.
The foregoing description does not limit the present invention in any way, and every employing is equal to the technical scheme that replacement or the mode of equivalent transformation obtain and all drops in protection scope of the present invention.
Claims (1)
1. the manufacturing approach of a powder metallurgy planetary gear power transmission shaft is characterized in that may further comprise the steps:
(1) powder metallurgy die design: under the constant situation of planet gearing shaft overall dimensions; Change the powder metallurgy die structure; Making the planetary gear disc thickness of compacting back planetary gear power transmission shaft pressed compact is H+h; Wherein H is the planet wheel disc design thickness of planetary gear power transmission shaft, the surplus thickness of h on the planetary gear dish, increasing; Have the planetary gear axis hole on the planet wheel disc, said planetary gear axis hole is a blind hole, and its opening is on the planetary gear installed surface of planetary gear dish, and its degree of depth is H1, and wherein, H≤H1＜(H+h), the size of surplus thickness h is 0.8-1.5 a times of splined shaft pressed compact thickness;
(2) mixed-powder: evenly mix for use with auxiliary materials such as lubricant, binders by proportioning the powder metallurgy iron-based powder;
(3) compacting: the quantitative powder that mixes is sent in the die cavity of powder metallurgy planetary gear power transmission shaft on the press, be pressed into planetary gear power transmission shaft pressed compact;
(4) sintering:, planetary gear power transmission shaft pressed compact is sent into cracked ammonium or nitrogen atmosphere net strip sintering furnace sintering according to setting sintering process parameter;
(5) processing: remove the surplus thickness h of planet wheel disc from the splined shaft side of planetary gear power transmission shaft, the surplus thickness h partly is processed into splined shaft, the planetary gear axis hole of acquisition is a through hole;
(6) heat treatment; Adopt carbo-nitriding in the box heat-treatment furnace, then at the quenching oil quenching, last lonneal is to guarantee the case hardness and the fatigue performance of powder metallurgy planetary gear power transmission shaft;
(7) polishing; On grinder, grind to obtain the product of final size precision.
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| CN201210355317.8A CN102825255B (en) | 2012-09-21 | 2012-09-21 | Production method for drive shaft of powder metallurgy planetary gear |
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| CN201210355317.8A CN102825255B (en) | 2012-09-21 | 2012-09-21 | Production method for drive shaft of powder metallurgy planetary gear |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084589A (en) * | 2014-06-06 | 2014-10-08 | 马鞍山市恒毅机械制造有限公司 | Powder metallurgical automobile hub bearing unit |
| CN106787406A (en) * | 2017-02-26 | 2017-05-31 | 丁国剑 | A kind of load-carrying power transmission shaft of motor |
| JP2019070194A (en) * | 2018-11-29 | 2019-05-09 | 住友電工焼結合金株式会社 | Sintered component |
| CN111828605A (en) * | 2019-04-16 | 2020-10-27 | 通用汽车环球科技运作有限责任公司 | Method for producing a component made of dissimilar metals |
| US11305347B2 (en) | 2014-12-12 | 2022-04-19 | Sumitomo Electric Sintered Alloy, Ltd. | Method for manufacturing sintered component, sintered component, and drill |
| CN117620178A (en) * | 2023-12-04 | 2024-03-01 | 海安县鹰球粉末冶金有限公司 | Manufacturing method of high-strength powder metallurgy spiral gear for new energy automobile motor |
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| JP2002194475A (en) * | 2000-12-27 | 2002-07-10 | Daido Steel Co Ltd | THIN SHEET OF Fe-Co BASED ALLOY AND ITS PRODUCTION METHOD |
| CN2934774Y (en) * | 2006-07-22 | 2007-08-15 | 陈建成 | Planet gear rack of automobile |
| CN101386073A (en) * | 2007-09-14 | 2009-03-18 | 葛莲 | Method for manufacturing powder metallurgy guide |
| CN102107282A (en) * | 2011-01-11 | 2011-06-29 | 山东金聚粉末冶金有限公司 | Automobile oil way joint and manufacturing method thereof |
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| US20020077213A1 (en) * | 2000-09-25 | 2002-06-20 | Hofschulte Wolfram H. | Two-stage gear mechanism |
| JP2002194475A (en) * | 2000-12-27 | 2002-07-10 | Daido Steel Co Ltd | THIN SHEET OF Fe-Co BASED ALLOY AND ITS PRODUCTION METHOD |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104084589A (en) * | 2014-06-06 | 2014-10-08 | 马鞍山市恒毅机械制造有限公司 | Powder metallurgical automobile hub bearing unit |
| CN104084589B (en) * | 2014-06-06 | 2015-12-30 | 安徽吉思特智能装备有限公司 | A kind of powder metallurgy automobile hub-bearing unit |
| US11305347B2 (en) | 2014-12-12 | 2022-04-19 | Sumitomo Electric Sintered Alloy, Ltd. | Method for manufacturing sintered component, sintered component, and drill |
| US11325186B2 (en) | 2014-12-12 | 2022-05-10 | Sumitomo Electric Sintered Alloy, Ltd. | Method for manufacturing sintered component, sintered component, and drill |
| CN106787406A (en) * | 2017-02-26 | 2017-05-31 | 丁国剑 | A kind of load-carrying power transmission shaft of motor |
| JP2019070194A (en) * | 2018-11-29 | 2019-05-09 | 住友電工焼結合金株式会社 | Sintered component |
| CN111828605A (en) * | 2019-04-16 | 2020-10-27 | 通用汽车环球科技运作有限责任公司 | Method for producing a component made of dissimilar metals |
| CN117620178A (en) * | 2023-12-04 | 2024-03-01 | 海安县鹰球粉末冶金有限公司 | Manufacturing method of high-strength powder metallurgy spiral gear for new energy automobile motor |
| CN117620178B (en) * | 2023-12-04 | 2024-08-06 | 海安县鹰球粉末冶金有限公司 | Manufacturing method of high-strength powder metallurgy spiral gear for new energy automobile motor |
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| CN102825255B (en) | 2014-06-04 |
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