CN102191364B - Carburizing and quenching process for gear made of alloy steel - Google Patents
Carburizing and quenching process for gear made of alloy steel Download PDFInfo
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- CN102191364B CN102191364B CN2011101334133A CN201110133413A CN102191364B CN 102191364 B CN102191364 B CN 102191364B CN 2011101334133 A CN2011101334133 A CN 2011101334133A CN 201110133413 A CN201110133413 A CN 201110133413A CN 102191364 B CN102191364 B CN 102191364B
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Abstract
The invention relates to a carburizing and quenching process for a gear made of alloy steel used in the field of agricultural machinery. The process comprises the following steps of: feeding raw materials into a furnace, degasifying, carrying out strong carburizing, diffusing, cooling and preserving heat, taking out of the furnace, quenching and the like. The carburizing and quenching process for the gear made of alloy steel can effectively control gear deformation during processing, thus improving the quality of gear products.
Description
Technical field
The carburizing quenching process of the gear of processing by steel alloy that the present invention relates to use in a kind of field of agricultural machinery.
Background technology
Up to now; The gear heat treatment deformation is zero also can't accomplish, even adopt the means of Quenching press and so on, can not make gear each item distortion index (like ovality, degree of deflection) be entirely zero; What can accomplish at present can only be to reduce deflection, improves deformation rule property.The carburizing quenching process of the gear of being processed by steel alloy that uses in traditional field of agricultural machinery mainly may further comprise the steps: (1) furnace temperature is advanced stove at 840 ° of above products of C, and the exhaust of lowering the temperature is then dripped methyl alcohol, dripped kerosene and also be incubated the setting-out of Hou Guan hole; (2) carburazing period, carbon potential 1.25%cp drips methyl alcohol, drips kerosene, and the carburazing period finished when the sampling degree of depth reached 0.025～0.030mm; (3) diffusion period, carbon potential 1.05%cp drips methyl alcohol, drips kerosene, and diffusion period finished when the sampling degree of depth reached 0.04～0.045mm; (4) cooling, carbon potential 0.85%cp drips methyl alcohol, drips kerosene; (5) quenching of coming out of the stove, the quenching oil temperature is higher than 100 ° of C, the stirring that whisking appliance does not stop when going into oil.The problem that exists through the gear that has carburizing quenching process production now is: (1) carburizing and quenching temperature are high, and the structural stress of generation is big, causes gear shifting quadrant texturing big; (2) close the preceding kerosene that drips of hole setting-out, cause the depth of hardening zone of product in sampling results and the stove inconsistent, cause erroneous judgement easily; Gear was gone into oil with the quenching pasta with the parallel mode of keeping flat when (3) product quenched into oil, and opened oil tank and stirrer earlier and stir, and caused product floating, caused endoporus to lose circle, the distortion of flank of tooth cydariform.
Summary of the invention
The objective of the invention is the deficiency that exists for the carburizing quenching process that solves the existing gear of processing by steel alloy, the carburizing quenching process of the gear of processing by steel alloy that disclose that a kind of effectively pinion is out of shape.
In order to realize above-mentioned goal of the invention, the technical scheme below the present invention has adopted:
A kind of carburizing quenching process of the gear of processing by steel alloy, in turn include the following steps: stove is advanced in (1), and furnace temperature gear when 810～820 ° of C advances stove, and temperature heats up after dropping to 740 ° of C～760 ° C; (2) exhaust was dripped methyl alcohol 75～90 minutes, and temperature rises to 860 ° of C and is incubated Hou Guan hole setting-out in 25～35 minutes again; (3) ooze by force, carbon potential 1.25%cp, furnace pressure 15～20Pa drips methyl alcohol, drips kerosene, and the sample gear carburized depth finishes when reaching 0.02～0.030mm; (4) diffusion, carbon potential 1.05%cp, furnace pressure 10～15Pa drips methyl alcohol, drips kerosene, lowers the temperature when the sample gear carburized depth reaches 0.04～0.045mm; (5) cooling insulation is incubated after being cooled to 820 ° of C, carbon potential 0.85%cp, and furnace pressure 5～10Pa drips methyl alcohol, drips kerosene; (6) quenching of coming out of the stove, the quenching oil temperature is controlled between 80 ° of C～100 ° C, and gear and the vertical mode of quenching pasta are gone into oil, stop oil tank and stirrer when going into oil, treat that gear quenching is gone into to open oil tank and stirrer again behind the oil and stir; The amount of above-mentioned kerosene is controlled by carbon potential control meter, oxygen probe control carbon potential.
As preferably, the amount of dripping methyl alcohol during said step (2) exhaust is 180～200 droplets/minute; Step (3) is dripped methyl alcohol when oozing by force amount is 150～180 droplets/minute, 80～100 minutes time; The amount of dripping methyl alcohol during step (4) diffusion is 150～180 droplets/minute, 50～80 minutes time; The amount of dripping methyl alcohol in the step (5) is 60～80 droplets/minute, 30 minutes time.
As preferably; The material of said gear is U.S. mark steel alloy (U.S. mark 8620 steel alloys); The outside diameter of gear
thickness 17mm; Surface hardness 56～62HRC; The gear of above-mentioned materials and performance is best in quality through the gear product that above-mentioned carburizing and quenching processes, and distortion is minimum.
The carburizing quenching process of a kind of gear of processing by steel alloy that has adopted technique scheme; Comprise into stove, exhaust successively, ooze by force, spread, lower the temperature insulation and steps such as the quenching of coming out of the stove; Parameters such as pressure, temperature, rate-of flow are all adjusted to the best, have controlled the distortion of gear effectively.Wherein advance the stove furnace temperature between 810～820 ° of C; The quenching oil temperature is controlled between 80 ° of C～100 ° C; The processing quality that is lower than the said temperature gear can't guarantee that it is big to be higher than the said temperature gear shifting quadrant texturing, especially behind the gear wheel carburization; The structural stress of the high more generation of quenching temperature is big more, is out of shape big more.Drip kerosene again after closing the hole setting-out, make the depth of hardening zone basically identical of sampling results and stove internal wheel, be convenient to judge that the actual state of gear operates accordingly.When going into oil, gear quenching stops oil tank and stirrer earlier; Gear is gone into oil back restir; Being that gear and the vertical mode of quenching pasta are static goes into oil, staticly goes into oil and has reduced Internal Hole Deformation, and flank of tooth cydariform is stablized indeformable; It is favourable to the plane deflection deformation that solves gear that gear and the vertical mode of quenching pasta are gone into oil, and the bore distortion is controlled in the 0.08mm scope.In sum, the advantage of being somebody's turn to do the carburizing quenching process of the gear of being processed by steel alloy is the effectively distortion of pinion in the course of processing, has improved the quality of gear product.
Embodiment
In the face of doing, the present invention further describes down.
A kind of carburizing quenching process of the gear of processing by steel alloy; The material of gear is U.S. mark 8620 steel alloys; The outside diameter of gear
thickness 17mm; Length-to-diameter ratio surpasses 8 times, flank of tooth cydariform amount 0.01～0.02mm, carburizing and quenching case depth 0.5mm ± 0.10; Surface hardness 56～62HRC, the similar gear ring of product structure.Technology in turn includes the following steps: stove is advanced in (1), and furnace temperature gear when 810～820 ° of C advances stove, and temperature heats up after dropping to 740 ° of C～760 ° C; (2) exhaust was dripped methyl alcohol 75～90 minutes, and the amount of dripping methyl alcohol is 180～200 droplets/minute, and temperature rises to 860 ° of C and is incubated Hou Guan hole setting-out in 25～35 minutes again; (3) ooze by force, carbon potential 1.25%cp, furnace pressure 15～20Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 150～180 droplets/minute, and 80～100 minutes time, the sample gear carburized depth finishes when reaching 0.02～0.030mm; (4) diffusion, carbon potential 1.05%cp, furnace pressure 10～15Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 150～180 droplets/minute, 50～80 minutes time, lowers the temperature when the sample gear carburized depth reaches 0.04～0.045mm; (5) cooling insulation is incubated after being cooled to 820 ° of C, carbon potential 0.85%cp, and furnace pressure 5～10Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 60～80 droplets/minute, 30 minutes time; (6) quenching of coming out of the stove, the quenching oil temperature is controlled between 80 ° of C～100 ° C, and gear and the vertical mode of quenching pasta are gone into oil, stop oil tank and stirrer when going into oil, treat that gear quenching is gone into to open oil tank and stirrer again behind the oil and stir.The amount of above-mentioned kerosene is controlled by carbon potential control meter, oxygen probe control carbon potential, and control is precisely.
Through above-mentioned carburizing and quenching, the endoporus of gear distortion is that gear is directly jumped and is controlled in the 0.08mm scope carburizing and quenching case depth 0.5mm ± 0.10; Variation off tolerance is 0.2mm, and the variation off tolerance of standard is about 0.4mm, and the narrow explanation control of case depth variation off tolerance hardening capacity is good relatively; Bandwidth is big more; Uneven components is described, the back stress distribution of quenching is irregular, is out of shape irregular.Said gear is processed in after the quenching tempering in time and removes structural stress and residualinternal stress, and tempering wants fully generally be set at 170 ° of C～180 ° C, is incubated 2 hours, once or 2 times, and to reach the purpose of stable dimensions.
Following table is the handicraft product qualification rate situation of traditional technology and this patent
Claims (2)
1. the carburizing quenching process of a gear of processing by steel alloy, it is characterized in that in turn including the following steps: stove is advanced in (1), and furnace temperature gear when 810～820 ° of C advances stove, and temperature heats up after dropping to 740 ° of C～760 ° C; (2) exhaust was dripped methyl alcohol 75～90 minutes, and the amount of dripping methyl alcohol is 180～200 droplets/minute, and temperature rises to 860 ° of C and is incubated Hou Guan hole setting-out in 25～35 minutes again; (3) ooze by force, carbon potential 1.25%cp, furnace pressure 15～20Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 150～180 droplets/minute, and 80～100 minutes time, the sample gear carburized depth finishes when reaching 0.02～0.030mm; (4) diffusion, carbon potential 1.05%cp, furnace pressure 10～15Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 150～180 droplets/minute, 50～80 minutes time, lowers the temperature when the sample gear carburized depth reaches 0.04～0.045mm; (5) cooling insulation is incubated after being cooled to 820 ° of C, carbon potential 0.85%cp, and furnace pressure 5～10Pa drips methyl alcohol, drips kerosene, and the amount of dripping methyl alcohol is 60～80 droplets/minute, 30 minutes time; (6) quenching of coming out of the stove, the quenching oil temperature is controlled between 80 ° of C～100 ° C, and gear and the vertical mode of quenching pasta are gone into oil, stop oil tank and stirrer when going into oil, treat that gear quenching is gone into to open oil tank and stirrer again behind the oil and stir; The amount of above-mentioned kerosene is controlled by carbon potential control meter, oxygen probe control carbon potential.
2. the carburizing quenching process of a kind of gear of being processed by steel alloy according to claim 1, the material that it is characterized in that said gear are U.S. mark steel alloys, outside diameter of gear φ 140.56mm, thickness 17mm, surface hardness 56～62HRC.
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| CN2011101334133A CN102191364B (en) | 2011-05-25 | 2011-05-25 | Carburizing and quenching process for gear made of alloy steel |
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| CN2011101334133A CN102191364B (en) | 2011-05-25 | 2011-05-25 | Carburizing and quenching process for gear made of alloy steel |
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| CN102191364B true CN102191364B (en) | 2012-11-14 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703909A (en) * | 2012-05-24 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Combined carburizing and quenching process for improving gear performance |
| CN103643242A (en) * | 2013-11-26 | 2014-03-19 | 常熟市东风齿轮厂 | Carburization quenching technology for alloy steel gears |
| CN103643200A (en) * | 2013-11-26 | 2014-03-19 | 常熟市东风齿轮厂 | Composite carburization quenching technology for gear |
| CN103834953B (en) * | 2014-02-24 | 2015-12-09 | 浙江浦江齿轮有限公司 | A kind of carburizing quenching process of inside spline wheel gear |
| CN104357796B (en) * | 2014-11-24 | 2016-11-23 | 烟台智本知识产权运营管理有限公司 | The carburizing quenching process of automobile gear |
| CN105154633B (en) * | 2015-10-26 | 2018-05-29 | 江苏保捷锻压有限公司 | A kind of rapid carburization heat treatment process of automobile differential drive gear |
| CN109594034A (en) * | 2018-12-28 | 2019-04-09 | 綦江齿轮传动有限公司 | The heat treatment method of synchronous gear seat |
| CN111468910A (en) * | 2020-05-29 | 2020-07-31 | 全椒县众联机械有限公司 | Antirust processing technology of cylindrical gear |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1624189A (en) * | 2004-12-13 | 2005-06-08 | 中原工学院 | Whole process variable pressure controlled carburation method |
| CN1644750A (en) * | 2005-01-21 | 2005-07-27 | 哈尔滨工业大学 | Rare earth controllable carburizing method for furnace for periodical operation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1624189A (en) * | 2004-12-13 | 2005-06-08 | 中原工学院 | Whole process variable pressure controlled carburation method |
| CN1644750A (en) * | 2005-01-21 | 2005-07-27 | 哈尔滨工业大学 | Rare earth controllable carburizing method for furnace for periodical operation |
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Address after: No. 618 Pujiang County Hengchang 322200 Avenue in Jinhua city in Zhejiang Province Patentee after: Zhejiang Feng an gear Limited by Share Ltd Address before: 322200 No. 29 Renmin West Road, Pujiang County, Zhejiang, Jinhua Patentee before: Zhejiang Pujiang Gear Co., Ltd. |