CN103602880A - As-cast condition production method of high strength and toughness QT850-5 crankshaft - Google Patents
As-cast condition production method of high strength and toughness QT850-5 crankshaft Download PDFInfo
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- CN103602880A CN103602880A CN201310641204.9A CN201310641204A CN103602880A CN 103602880 A CN103602880 A CN 103602880A CN 201310641204 A CN201310641204 A CN 201310641204A CN 103602880 A CN103602880 A CN 103602880A
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Abstract
The invention discloses an as-cast condition production method of a high strength and toughness QT850-5 crankshaft. The production method comprises the effective measures of appropriate furnace charge ratio selection, electric furnace smelting, strict pre-furnace control, proper spheroidization treatment and inoculation treatment processes, iron mold coated sand applying process, addition of proper alloying elements and the like. The production method overcomes the defect of easy deformation of a heat-treatment crankshaft, reduces the machining allowance of the crankshaft, decreases heat treatment expenses, significantly reduces the production cost, moreover, greatly shortens the production cycle, and is a energy-saving production method which is feasible and worthy of popularizing.
Description
Technical field
The present invention is specifically related to the production method, the particularly production method of as cast condition QT850-5 bent axle of the high-strong toughness bent axle of various diesel engine uses.
Background technology
It is along with the widespread use of the continuous lifting, particularly turbocharging technology of diesel engine power, more and more higher to the requirement of the heart component-bent axle of diesel engine..The mechanical property of bent axle is towards high-intensity high-tenacity future development, from the equal higher high-strong toughness magnesium iron of trade mark QT600-3, QT700-3, QT800-2 nonstandard QT850-5 intensity unit elongation up till now.The bent axle of generally producing nonstandard QT850-5 all obtains by heat treatment normalizing mode, and it is easily distortion after bent axle is processed that heat treatment mode has a shortcoming.
Summary of the invention
Goal of the invention: the invention provides a kind of production method that obtains QT850-5 bent axle by as cast condition, this method has overcome thermal treatment bent axle and has held yielding defect, reduced thermal treatment expense, significantly reduced production cost, and greatly shorten the production cycle, be a kind of practicable energy-saving production method being worthy to be popularized.
Technical scheme: a kind of as cast condition production method of high-strong toughness QT850-5 bent axle,
(1), select the pig iron and steel scrap, it forms according to following parts by weight: steel scrap is 65-75 part, the pig iron is 10-25 part, all the other are foundry return, by electric furnace fast melting, become molten iron, stokehold is detected and is adjusted its composition by spectrograph;
(2), use Iron Mould Coated Sand, its sand mold employing heated core box method thermofixation during Iron Mould Coated Sand;
(3), adopt the spheroidizing of lid bag, and adopt current-following inoculation processing when breeding and pour into a mould in baric effective inoculation agent bag;
(4), add suitable alloying element.
As optimization: alloying element wherein forms according to following parts by weight: C:3.70-3.80 part, Si:2.1-2.3 part, Mn:0.35-0.45 part, P:0.025-0.040 part, S:0.005-0.015 part, Cu:0.6-0.7 part, Sn:0.014-0.022 part, Re:0.015-0.025 part, Mg:0.038-0.055 part, micro-summation is 0.050-0.100 part.
Beneficial effect: the present invention has overcome thermal treatment bent axle and held yielding defect, reduce the process redundancy of bent axle, reduced thermal treatment expense, significantly reduced production cost, and greatly shorten the production cycle, be a kind of practicable energy-saving production method being worthy to be popularized.
Embodiment
Below in conjunction with specific embodiment, the present invention will be described in detail.
Specific embodiment 1:
An as cast condition production method for high-strong toughness QT850-5 bent axle,
(1), select the pig iron and steel scrap, it forms according to following parts by weight: steel scrap is 75 parts, the pig iron is 10 parts, all the other are foundry return, by electric furnace fast melting, become molten iron, stokehold is detected and is adjusted its composition by spectrograph;
(2), use Iron Mould Coated Sand, its sand mold employing heated core box method thermofixation during Iron Mould Coated Sand;
(3), adopt the spheroidizing of lid bag, and adopt current-following inoculation processing when breeding and pour into a mould in baric effective inoculation agent bag;
(4), add suitable alloying element.
Alloying element wherein forms according to following parts by weight: C:3.70 part, and Si:2.1 part, Mn:0.35 part, P:0.025 part, S:0.005 part, Cu:0.6 part, Sn:0.014 part, Re:0.015 part, Mg:0.038 part, micro-summation is 0.050 part.
Specific embodiment 2:
An as cast condition production method for high-strong toughness QT850-5 bent axle,
(1), select the pig iron and steel scrap, it forms according to following parts by weight: steel scrap is 65 parts, the pig iron is 25 parts, all the other are foundry return, by electric furnace fast melting, become molten iron, stokehold is detected and is adjusted its composition by spectrograph;
(2), use Iron Mould Coated Sand, its sand mold employing heated core box method thermofixation during Iron Mould Coated Sand;
(3), adopt the spheroidizing of lid bag, and adopt current-following inoculation processing when breeding and pour into a mould in baric effective inoculation agent bag;
(4), add suitable alloying element.
Alloying element wherein forms according to following parts by weight: C:3.80 part, and Si:2.3 part, Mn:0.45 part, P:0.040 part, S:0.015 part, Cu:0.7 part, Sn:0.022 part, Re:0.025 part, Mg:0.055 part, micro-summation is 0.100 part.
Specific embodiment 3:
An as cast condition production method for high-strong toughness QT850-5 bent axle,
(1), select the pig iron and steel scrap, it forms according to following parts by weight: steel scrap is 68 parts, the pig iron is 20 parts, all the other are foundry return, by electric furnace fast melting, become molten iron, stokehold is detected and is adjusted its composition by spectrograph;
(2), use Iron Mould Coated Sand, its sand mold employing heated core box method thermofixation during Iron Mould Coated Sand;
(3), adopt the spheroidizing of lid bag, and adopt current-following inoculation processing when breeding and pour into a mould in baric effective inoculation agent bag;
(4), add suitable alloying element.
Alloying element wherein forms according to following parts by weight: C:3.73 part, and Si:2.2 part, Mn:0.42 part, P:0.03 part, S:0.011 part, Cu:0.64 part, Sn:0.019 part, Re:0.022 part, Mg:0.042 part, micro-summation is 0.078 part.
Claims (2)
1. an as cast condition production method for high-strong toughness QT850-5 bent axle, is characterized in that:
(1), select the pig iron and steel scrap, it forms according to following parts by weight: steel scrap is 65-75 part, the pig iron is 10-25 part, all the other are foundry return, by electric furnace fast melting, become molten iron, stokehold is detected and is adjusted its composition by spectrograph;
(2), use Iron Mould Coated Sand, its sand mold employing heated core box method thermofixation during Iron Mould Coated Sand;
(3), adopt the spheroidizing of lid bag, and adopt current-following inoculation processing when breeding and pour into a mould in baric effective inoculation agent bag;
(4), add suitable alloying element.
2. the as cast condition production method of high-strong toughness QT850-5 bent axle according to claim 1, it is characterized in that: alloying element wherein forms according to following parts by weight: C:3.70-3.80 part, Si:2.1-2.3 part, Mn:0.35-0.45 part, P:0.025-0.040 part, S:0.005-0.015 part, Cu:0.6-0.7 part, Sn:0.014-0.022 part, Re:0.015-0.025 part, Mg:0.035-0.055 part, micro-summation is 0.050-0.100 part.
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| CN201310641204.9A CN103602880A (en) | 2013-12-04 | 2013-12-04 | As-cast condition production method of high strength and toughness QT850-5 crankshaft |
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| CN201310641204.9A CN103602880A (en) | 2013-12-04 | 2013-12-04 | As-cast condition production method of high strength and toughness QT850-5 crankshaft |
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Cited By (8)
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| CN104128564A (en) * | 2014-08-20 | 2014-11-05 | 侯马市晋烽机械铸造有限公司 | Casting process of sand-lined metal mold cast nodular iron hinge lug |
| CN106077487A (en) * | 2016-07-12 | 2016-11-09 | 湖州鼎盛机械制造有限公司 | The Iron Mould Coated Sand technique of Large Crankshaft |
| CN107557658A (en) * | 2017-10-20 | 2018-01-09 | 湖州正德轻工机械有限公司 | A kind of manufacture method of cast-iron crankshaft |
| CN107604236A (en) * | 2017-09-21 | 2018-01-19 | 苏州沙特卡铸造有限公司 | A kind of method for improving lathe casting hardness |
| CN108103392A (en) * | 2018-01-12 | 2018-06-01 | 湖北星源科技有限公司 | A kind of high-strength ductile cast iron production method |
| CN112743041A (en) * | 2020-12-23 | 2021-05-04 | 银峰铸造（芜湖）有限公司 | Crankshaft casting processing method |
| CN115287526A (en) * | 2022-07-08 | 2022-11-04 | 东风商用车有限公司 | Nodular cast iron rocker arm and manufacturing method and application thereof |
| CN115287524A (en) * | 2022-07-08 | 2022-11-04 | 东风商用车有限公司 | Heavy-duty commercial vehicle diesel engine rocker arm and manufacturing method and application thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104128564A (en) * | 2014-08-20 | 2014-11-05 | 侯马市晋烽机械铸造有限公司 | Casting process of sand-lined metal mold cast nodular iron hinge lug |
| CN106077487A (en) * | 2016-07-12 | 2016-11-09 | 湖州鼎盛机械制造有限公司 | The Iron Mould Coated Sand technique of Large Crankshaft |
| CN107604236A (en) * | 2017-09-21 | 2018-01-19 | 苏州沙特卡铸造有限公司 | A kind of method for improving lathe casting hardness |
| CN107557658A (en) * | 2017-10-20 | 2018-01-09 | 湖州正德轻工机械有限公司 | A kind of manufacture method of cast-iron crankshaft |
| CN108103392A (en) * | 2018-01-12 | 2018-06-01 | 湖北星源科技有限公司 | A kind of high-strength ductile cast iron production method |
| CN112743041A (en) * | 2020-12-23 | 2021-05-04 | 银峰铸造（芜湖）有限公司 | Crankshaft casting processing method |
| CN115287526A (en) * | 2022-07-08 | 2022-11-04 | 东风商用车有限公司 | Nodular cast iron rocker arm and manufacturing method and application thereof |
| CN115287524A (en) * | 2022-07-08 | 2022-11-04 | 东风商用车有限公司 | Heavy-duty commercial vehicle diesel engine rocker arm and manufacturing method and application thereof |
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Application publication date: 20140226 |