CN102878197B - Hardness gradation gear type pivoting support and gear quenching processing technology thereof - Google Patents
Hardness gradation gear type pivoting support and gear quenching processing technology thereof Download PDFInfo
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- CN102878197B CN102878197B CN201210335957.2A CN201210335957A CN102878197B CN 102878197 B CN102878197 B CN 102878197B CN 201210335957 A CN201210335957 A CN 201210335957A CN 102878197 B CN102878197 B CN 102878197B
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Abstract
The invention discloses a kind of hardness gradation gear type pivoting support and gear quenching processing technology thereof, be characterized in when gear carries out induction hardening, gear heated zones is divided into normal consistency district, transition zone and three sections, soft ribbons district, normal consistency district, transition zone and soft ribbons district set respectively three sections of different linear velocities with numerical control program, the linear velocity in transition zone and soft ribbons district be the 1-3 in normal consistency district doubly; After heating stops, reducing quenching liquid water jetting apparatus and continue the hydrojet time, make the upper end of gear keep the condition of high temperature, carry out high temperature self tempering from top to bottom in the middle part of gear.Hardness gradation gear type pivoting support of the present invention and gear quenching processing technology thereof can improve the anti-extrusion ability on gear top, effectively can solve the extruding broken teeth problem of pivoting support.
Description
Technical field
The present invention relates to a kind of pivoting support structural design and gear quenching processing technology thereof.
Prior art
Pivoting support (also claiming turntable bearing) is as the important foundation element of engineering machinery and building machinery, it is the necessary important force transfer element of machinery needing to do relative revolution between all two-part, need to bear again axial force, radial force, tilting moment simultaneously, except for excavator, tower crane, mobile crane and all kinds of hoist supporting except, be also widely used in light industry and machinery, harbour machinery, metallurgical machinery, medical machinery, industrial robot, rock tunnel(ling) machine, stacker-reclaimer, game equipment, missile launcher, radar antenna etc.The pivoting support of more than 90% is gear transmission mode, wherein the gear type pivoting support of 50% need carry out gear quenching, the quenching form of existing pivoting support gear is the quenching of full-depth tooth face, with at the uniform velocity continuous top when quenching processing technology is heating, and carry out Liquid injection cooling with water jetting apparatus and to quench the uniform hardness in upper bottom and quench-hardened case that gear is reached, quenching hardness is 53 ± 3HRC, and pivoting support play is the steel ball size of 0.008 times.Broken teeth is the gear type pivoting support inefficacy one of the main reasons after quenching, and mainly concentrates on the gear top near non-attachment face.The main cause of broken teeth is caused to be through interrelated data analysis: under the effect in tilting moment, pivoting support can produce distortion, add that pivoting support itself exists play, the gear top of the pinion mate pivoting support that cantilever is installed is carried out extruding and is caused the early stage broken teeth of pivoting support.Therefore the incidence rate improving to reduce broken teeth to pivoting support structure &processes is needed.
Summary of the invention
The object of the invention is to provide a kind of hardness gradation gear type pivoting support and gear quenching processing technology thereof.This hardness gradation gear type pivoting support, by improving the structure of gear type pivoting support and processing technology aspect, significantly can reduce the incidence rate of broken teeth.
Hardness gradation gear type pivoting support of the present invention is by outer ring, steel ball, separator, ring gear, sealing skin composition, or described hardness gradation gear type pivoting support is by external toothing, steel ball, separator, inner ring, sealing skin composition, in, play after the assembling of outer ring controls within 0.004 times of steel ball size, gear surface hardness is hardness gradation, soft ribbons district is divided into from the gear top near non-attachment face, transition zone, normal consistency district, hardness is respectively 25-40HRC, 40-50HRC, 50 ~ 56HRC, soft ribbons sector width is 0.2 ~ 0.3 times of widths over teeth, width of transition zone is 0.2 ~ 0.3 times of widths over teeth, normal consistency sector width is 0.4 ~ 0.6 times of widths over teeth.
The gear quenching processing technology of hardness gradation gear type pivoting support of the present invention is design like this: when gear carries out induction hardening, gear heated zones is divided into normal consistency district, transition zone and three sections, soft ribbons district, normal consistency district, transition zone and soft ribbons district set respectively three sections of different linear velocities with numerical control program, transition zone and soft ribbons district are 1-3 times of normal line speed, and concrete linear speed angle value is determined according to module size; After heating stops, reducing quenching liquid water jetting apparatus and continue the hydrojet time, make the upper end of gear keep the condition of high temperature, carry out high temperature self tempering from top to bottom in the middle part of gear.
The invention has the beneficial effects as follows: (1) hardness gradation gear can improve the anti-extrusion ability on gear top, the self tempering of (2) hardness gradation gear in course of working makes inner stress of work be discharged more fully, and the bulk deformation of workpiece measures control; Experimental result shows that this invention effectively can solve the extruding broken teeth problem of pivoting support.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of hardness gradation gear type pivoting support
Fig. 2 is hardness gradation gear quenching layer schematic diagram of the present invention
In figure: 1, pivoting support outer ring; 2, steel ball; 3, spacing block; 4, pivoting support ring gear; 5, skin is sealed; 7, soft ribbons; 8, transition zone; 9, normal consistency district.
Embodiment
As can be seen from Figure 1, hardness gradation gear type pivoting support of the present invention is by outer ring 1, steel ball 2, spacing block 3, ring gear 4, sealing skin 5 forms, in, play after the assembling of outer ring controls within 0.004 times of steel ball 2 diameter, gear surface hardness is hardness gradation, soft ribbons district 7 is divided into from the gear top near non-attachment face, transition zone 8, normal consistency district 9, hardness is respectively 25-40HRC, 40-50HRC, 50 ~ 56HRC, soft ribbons district 7 width is 0.2 ~ 0.3 times of widths over teeth, transition zone 8 width is 0.2 ~ 0.3 times of widths over teeth, normal consistency district 9 width is 0.4 ~ 0.6 times of widths over teeth.
The gear quenching processing technology of above-mentioned hardness gradation gear type pivoting support is design like this: when gear carries out induction hardening, gear heated zones is divided into normal consistency district 9, transition zone 8 and 7 three sections, soft ribbons district, normal consistency district, transition zone and soft ribbons district set respectively three sections of different linear velocities with numerical control program, transition zone and soft ribbons district are 1-3 times of normal line speed, and concrete linear speed angle value is determined according to module size; After heating stops, reducing quenching liquid water jetting apparatus and continue the hydrojet time, make the upper end of gear keep the condition of high temperature, carry out high temperature self tempering from top to bottom in the middle part of gear.Such as, processing certain model pivoting support steel ball size is 40mm, play≤0.16mm, module 14, pressure angle 20 degree, gear height 120mm.The processing technology of hardness gradation gear type pivoting support and the main distinction of common pivoting support processing technology are the improvement of gear heat treatment aspect, and the processing of all the other aspects is identical.Concrete technology improves as follows:
From Fig. 2 and table 1, gear heated zones is divided into normal consistency district 9, transition zone 8 and 7 three sections, soft ribbons district, normal consistency district 9 is 50mm, transition zone 8 and soft ribbons district 7 are 35mm, with numerical control program, the heater wire speed in normal consistency district 9, transition zone 8 and soft ribbons district 7 are set to 3.5mm/s, 4.0mm/s, 4.5mm/s respectively.After heating stops, reducing quenching liquid water jetting apparatus and continue the hydrojet time, make the upper end of gear keep the condition of high temperature, carry out high temperature self tempering from top to bottom in the middle part of gear.Assay: the hardness at 35mm place of soft ribbons district is HRC25-40, transition zone 35mm place is HRC40-50, and 50mm place of normal consistency district is more than HRC50, reaches hardness gradation effect.
Table 1: technique and program parameter table
Claims (2)
1. a hardness gradation gear type pivoting support, described hardness gradation gear type pivoting support is by external toothing, steel ball, separator, inner ring, sealing skin composition, the gear surface hardness that it is characterized in that described hardness gradation gear type pivoting support is hardness gradation, soft ribbons district is divided into from the gear top near non-attachment face, transition zone, normal consistency district, hardness is respectively 25-40HRC, 40-50HRC, 50 ~ 56HRC, soft ribbons sector width is 0.2 ~ 0.3 times of widths over teeth, width of transition zone is 0.2 ~ 0.3 times of widths over teeth, normal consistency sector width is 0.4 ~ 0.6 times of widths over teeth.
2. hardness gradation gear type pivoting support according to claim 1, after it is characterized in that the assembling of inside and outside circle, play controls within 0.004 times of steel ball size.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335957.2A CN102878197B (en) | 2012-09-12 | 2012-09-12 | Hardness gradation gear type pivoting support and gear quenching processing technology thereof |
| CN201410384561.6A CN104235177B (en) | 2012-09-12 | 2012-09-12 | Graduated hardness gear type pivoting support gear quenching processing technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210335957.2A CN102878197B (en) | 2012-09-12 | 2012-09-12 | Hardness gradation gear type pivoting support and gear quenching processing technology thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410384561.6A Division CN104235177B (en) | 2012-09-12 | 2012-09-12 | Graduated hardness gear type pivoting support gear quenching processing technique |
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| CN102878197A CN102878197A (en) | 2013-01-16 |
| CN102878197B true CN102878197B (en) | 2015-08-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057266A (en) * | 2014-06-04 | 2014-09-24 | 安徽省宁国顺昌机械有限公司 | Slewing bearing quenching type inner gear ring processing technology |
| US20200199704A1 (en) * | 2018-12-19 | 2020-06-25 | GM Global Technology Operations LLC | Method for heat treating with a gradual temperature profile |
| CN110900125A (en) * | 2019-11-20 | 2020-03-24 | 马鞍山市博创回转支承有限公司 | Machining method of slewing bearing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989999A (en) * | 1989-03-23 | 1991-02-05 | Hoesch Aktiengesellschaft | Empty-center rotating-roller joint |
| JPH08170714A (en) * | 1994-12-20 | 1996-07-02 | Toyota Motor Corp | Gear |
| DE10326819A1 (en) * | 2003-06-13 | 2004-12-30 | Zf Lenksysteme Gmbh | Composite toothed wheel used in gears of vehicle servo steering system, has outer layers in harder material than inner layer |
| CN202971557U (en) * | 2012-09-12 | 2013-06-05 | 马鞍山统力回转支承有限公司 | Gear type slewing bearing with gradually-changed hardness |
-
2012
- 2012-09-12 CN CN201210335957.2A patent/CN102878197B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989999A (en) * | 1989-03-23 | 1991-02-05 | Hoesch Aktiengesellschaft | Empty-center rotating-roller joint |
| JPH08170714A (en) * | 1994-12-20 | 1996-07-02 | Toyota Motor Corp | Gear |
| DE10326819A1 (en) * | 2003-06-13 | 2004-12-30 | Zf Lenksysteme Gmbh | Composite toothed wheel used in gears of vehicle servo steering system, has outer layers in harder material than inner layer |
| CN202971557U (en) * | 2012-09-12 | 2013-06-05 | 马鞍山统力回转支承有限公司 | Gear type slewing bearing with gradually-changed hardness |
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Denomination of invention: Gear-type slewing bearing with gradual hardness and its gear quenching process Effective date of registration: 20230208 Granted publication date: 20150805 Pledgee: Ma'anshan branch of Bank of China Ltd. Pledgor: TONGLI SLEWING RING CO.,LTD. Registration number: Y2023980032239 |
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