CN104831229A - Ion nitriding process of marine crankshaft - Google Patents
Ion nitriding process of marine crankshaft Download PDFInfo
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- CN104831229A CN104831229A CN201510241848.8A CN201510241848A CN104831229A CN 104831229 A CN104831229 A CN 104831229A CN 201510241848 A CN201510241848 A CN 201510241848A CN 104831229 A CN104831229 A CN 104831229A
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- nitriding
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- crankshaft
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Abstract
The invention discloses an ion nitriding process of a marine crankshaft, relating to the field of metal heat treatment. The ion nitriding process comprises the following steps: (1) arranging a cleaned crankshaft workpiece into a special marine crankshaft ion nitriding tool in a nitriding furnace; and (2) slowly heating the crankshaft workpiece in the furnace to 530 DEG C in a step-by-step manner, keeping the temperature for a period of time, introducing ammonia gas into the nitriding furnace, further heating to 550 DEG C, keeping the temperature for a period of time, cooling to 510 DEG C, keeping the temperature for a period of time, slowly reducing the temperature to be less than or equal to 150 DEG C after finishing the nitriding operation, then discharging the crankshaft workpiece. The ion nitriding process can solve the problems that all mechanical properties of the crankshaft after nitriding such as hardness, wearing resistance, fatigue resistance and corrosion resistance cannot meet the nitriding requirements due to non-uniform nitriding temperature in a nitriding process of the crankshaft.
Description
Technical field
The present invention relates to a kind of metal heating processing technology, more specifically a kind of nitriding process being exclusively used in bent axle ion nitriding.
Background technology
Along with developing rapidly of automobile, engineering machinery, agricultural machine and shipping industry etc., China's engine annual requirement reaches more than 6,000 ten thousand, rank first in the world, bent axle, as the core component of engine, plays keying action in energy transformation and power stage process.And in peculiar to vessel bent axle be diesel motor directly and screwshaft connect and transmit propulsive force.After the process of bent axle via nitride, its hardness, wear resistance, antifatigue, the performance such as anticorrosive can significantly promote, and are therefore one of heat treated important steps of bent axle.Ionitriding, also known as aura nitriding, utilizes glow discharge principle to carry out.Existing ion nitriding furnace, bent axle is placed on the cathode disc in furnace chamber, bent axle is made to carry out nitrogenize in aura coverage area, and the position that this mode causes bent axle to contact with cathode disc becomes aura weak area, the temperature of aura weak area is starkly lower than core temperature, and temperature is the important factor affecting crankshaft nitriding effect, and therefore neck of bent axle nitriding result is poor, whole crank shaft nitrogenize is uneven, does not reach the effect adopting ionitriding technique to improve bent axle mechanical property.
Summary of the invention
In order to solve prior art Problems existing, the invention provides a kind of ion nitriding technology of crank axle for vessel, it can solve bent axle in nitridation process because nitriding temperature is uneven, after causing crankshaft nitriding, its hardness, wear resistance, antifatigue, every mechanical property such as anticorrosive do not reach the problem of nitrogenize requirement.
In order to realize above object, technical scheme of the present invention is as follows: the ion nitriding technology of this crank axle for vessel, comprises the steps:
1) crankshaft workpiece loads on the crank axle for vessel ion nitriding special tool in nitriding furnace after cleaning up;
2) the slow ladder-elevating temperature to 530 of crankshaft workpiece DEG C insulation for some time of stove is installed, ammonia passes into nitriding furnace, after continuing to be warming up to 550 DEG C of insulation for some time, then be cooled to 510 DEG C of insulation for some time, nitriding terminates rear slow cooling to≤150 DEG C of described crankshaft workpiece and comes out of the stove.
In technique scheme, more specifically scheme is: described crank axle for vessel ion nitriding special tool comprises the nitrogenize hanger being arranged on and being fastened by furnace shell and furnace bottom supporting disk in the furnace chamber that formed, described nitrogenize hanger includes negative electrode link plate and negative electrode pillar, described negative electrode link plate is arranged on the top of described negative electrode pillar, the bottom of described negative electrode pillar is fixed on negative plate, and described negative plate is fixed on described furnace bottom supporting disk by the supporting disk pillar of insulation; Described negative electrode link plate is provided with inner ring, bent axle hanging hole that centre circle, outer ring hoop are evenly arranged, the distance of described bent axle hanging hole inner ring and centre circle is greater than the distance of centre circle and outer ring; Described bent axle is 42CrMo bent axle.
Further: the slow ladder-elevating temperature to 530 of the described crankshaft workpiece DEG C insulation after shove charge 6 hours, ammonia passes into nitriding furnace, continues to be warming up to 550 DEG C of insulations after 6 hours, then is cooled to 510 DEG C of insulations 6 hours.
Further: described crankshaft workpiece ladder-elevating temperature adopts small area analysis heating, and rate of heating is within 100 DEG C per hour.
Further: described ammonia passes into nitriding furnace after being through pyrolyzer thermal degradation, passing into air pressure is 500-550Pa, and gas flow is 850-890L/min.
Owing to have employed technique scheme, the present invention has following Advantageous Effects:
The present invention is eliminated by hanging arrangement and eliminates aura dead angle, and improve Crankshaft neck nitriding temperature, make nitrogenize district temperature along Crankshaft to being uniformly distributed, whole crank shaft nitrogenize is even; The distance that distance simultaneously by arranging bent axle hanging hole inner ring and centre circle is greater than centre circle and outer ring forms outer close interior thin layout, coordinate the adjustment of processing parameter, not only make each bar bent axle radially homogeneous temperature, and ensure that whole stove nitriding result is consistent, reach nitrogenize requirement, improve conforming product rate.
Accompanying drawing explanation
Fig. 1 is crank axle for vessel ion nitriding special tool structural representation in the present invention;
Fig. 2 is that schematic diagram is arranged in bent axle hanging hole.
In figure: 1, furnace bottom supporting disk; 2, furnace shell; 3, bent axle hanging hole; 4, negative electrode link plate; 5, negative electrode pillar; 6, bent axle; 7, negative plate; 8, supporting disk pillar.
Embodiment
Below in conjunction with embodiment, the present invention is further described:
The ion nitriding technology of crank axle for vessel of the present invention, comprises the steps:
1) crankshaft workpiece loads on the crank axle for vessel ion nitriding special tool in nitriding furnace after cleaning up;
2) DEG C insulation of the slow ladder-elevating temperature to 530 of crankshaft workpiece after stove 6 hours is installed, small area analysis heating is adopted when crankshaft workpiece ladder-elevating temperature, rate of heating is within 100 DEG C per hour, ammonia passes into nitriding furnace, ammonia passes into nitriding furnace after being through pyrolyzer thermal degradation, passing into air pressure is 500-550Pa, gas flow is 850-890L/min, then continue to be warming up to 550 DEG C of insulations after 6 hours, be cooled to 510 DEG C of insulations 6 hours again, nitriding terminates rear slow cooling to≤150 DEG C of described crankshaft workpiece and comes out of the stove.
The crank axle for vessel ion nitriding special tool adopted in the present invention as depicted in figs. 1 and 2, comprise the nitrogenize hanger being arranged on and being fastened by furnace shell 2 and furnace bottom supporting disk 1 in the furnace chamber that formed, nitrogenize hanger includes negative electrode link plate 4 and negative electrode pillar 5, negative electrode link plate 4 is arranged on the top of negative electrode pillar 5, the bottom of negative electrode pillar 5 is fixed on negative plate 7, and negative plate 7 is fixed on furnace bottom supporting disk 1 by the supporting disk pillar 8 of insulation; Negative electrode link plate 4 is provided with inner ring, bent axle hanging hole 3 that centre circle, outer ring hoop are evenly arranged, the distance of bent axle hanging hole 3 inner ring and centre circle is greater than the distance of centre circle and outer ring; Bent axle is 42CrMo bent axle.
Claims (5)
1. an ion nitriding technology for crank axle for vessel, is characterized in that comprising the steps:
1) crankshaft workpiece loads on the crank axle for vessel ion nitriding special tool in nitriding furnace after cleaning up;
2) DEG C insulation for some time of the slow ladder-elevating temperature to 530 of crankshaft workpiece after stove is installed, ammonia passes into nitriding furnace, after continuing to be warming up to 550 DEG C of insulation for some time, then be cooled to 510 DEG C of insulation for some time, nitriding terminates rear slow cooling to≤150 DEG C of described crankshaft workpiece and comes out of the stove.
2. the ion nitriding technology of crank axle for vessel according to claim 1, it is characterized in that: described crank axle for vessel ion nitriding special tool comprises the nitrogenize hanger being arranged on and being fastened by furnace shell (2) and furnace bottom supporting disk (1) in the furnace chamber that formed, described nitrogenize hanger includes negative electrode link plate (4) and negative electrode pillar (5), described negative electrode link plate (4) is arranged on the top of described negative electrode pillar (5), the bottom of described negative electrode pillar (5) is fixed on negative plate (7), described negative plate (7) is fixed on described furnace bottom supporting disk (1) by the supporting disk pillar (8) of insulation, described negative electrode link plate (4) is provided with inner ring, bent axle hanging hole (3) that centre circle, outer ring hoop are evenly arranged, the distance of described bent axle hanging hole (3) inner ring and centre circle is greater than the distance of centre circle and outer ring, described bent axle is 42CrMo bent axle.
3. the ion nitriding technology of crank axle for vessel according to claim 2, it is characterized in that: the slow ladder-elevating temperature to 530 of described crankshaft workpiece DEG C insulation 6 hours after shove charge, ammonia passes into nitriding furnace, continues to be warming up to 550 DEG C of insulations after 6 hours, then is cooled to 510 DEG C of insulations 6 hours.
4. the ion nitriding technology of the crank axle for vessel according to claim 1 or 3, is characterized in that: described crankshaft workpiece ladder-elevating temperature adopts small area analysis heating, and rate of heating is within 100 DEG C per hour.
5. the ion nitriding technology of the crank axle for vessel according to claim 1 or 3, is characterized in that: described ammonia passes into nitriding furnace after being through pyrolyzer thermal degradation, and passing into air pressure is 500-550Pa, and gas flow is 850-890L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510241848.8A CN104831229A (en) | 2015-05-13 | 2015-05-13 | Ion nitriding process of marine crankshaft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510241848.8A CN104831229A (en) | 2015-05-13 | 2015-05-13 | Ion nitriding process of marine crankshaft |
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| CN104831229A true CN104831229A (en) | 2015-08-12 |
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| CN201510241848.8A Pending CN104831229A (en) | 2015-05-13 | 2015-05-13 | Ion nitriding process of marine crankshaft |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846325A (en) * | 2015-05-14 | 2015-08-19 | 广西梧州运龙港船机械制造有限公司 | Ion nitriding tool for marine crankshaft |
| CN105603357A (en) * | 2015-12-31 | 2016-05-25 | 浙江舟山博斯特船舶设计研究院有限公司 | Ionic nitriding process for marine crankshafts |
| CN108103433A (en) * | 2017-12-14 | 2018-06-01 | 辽宁忠旺集团有限公司 | A kind of solar energy extruding die for aluminum shaped material nitrogenation treatment technology |
| CN112712956A (en) * | 2020-12-16 | 2021-04-27 | 横店集团东磁股份有限公司 | Nitriding method of rare earth magnet and nitrided rare earth magnet |
| CN117230405A (en) * | 2023-10-17 | 2023-12-15 | 江苏远方动力科技有限公司 | High-frequency quenching low-temperature nitriding composite strengthening system and method for surface of crankshaft journal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011115822A (en) * | 2009-12-04 | 2011-06-16 | Daido Steel Co Ltd | Method for manufacturing crankshaft |
| CN102418066A (en) * | 2011-11-29 | 2012-04-18 | 重庆潍柴发动机厂 | Horizontal gas nitrocarburizing technology used for large-diameter cylinder nodular iron crankshaft |
| CN102864408A (en) * | 2011-07-05 | 2013-01-09 | 上海龙钱热处理有限公司 | Deep plasma nitriding process of wind gear ring |
| CN103334078A (en) * | 2013-07-11 | 2013-10-02 | 滨州市东润机械有限公司 | Ion nitriding furnace |
| CN203307417U (en) * | 2013-07-11 | 2013-11-27 | 滨州市东润机械有限公司 | Ion nitriding furnace |
| CN203320111U (en) * | 2013-07-11 | 2013-12-04 | 滨州市东润机械有限公司 | Nitriding furnace temperature evenly distributing device |
| CN203360552U (en) * | 2013-06-21 | 2013-12-25 | 浙江太阳股份有限公司 | Hanging disc for crankshaft nitrogen treatment |
-
2015
- 2015-05-13 CN CN201510241848.8A patent/CN104831229A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011115822A (en) * | 2009-12-04 | 2011-06-16 | Daido Steel Co Ltd | Method for manufacturing crankshaft |
| CN102864408A (en) * | 2011-07-05 | 2013-01-09 | 上海龙钱热处理有限公司 | Deep plasma nitriding process of wind gear ring |
| CN102418066A (en) * | 2011-11-29 | 2012-04-18 | 重庆潍柴发动机厂 | Horizontal gas nitrocarburizing technology used for large-diameter cylinder nodular iron crankshaft |
| CN203360552U (en) * | 2013-06-21 | 2013-12-25 | 浙江太阳股份有限公司 | Hanging disc for crankshaft nitrogen treatment |
| CN103334078A (en) * | 2013-07-11 | 2013-10-02 | 滨州市东润机械有限公司 | Ion nitriding furnace |
| CN203307417U (en) * | 2013-07-11 | 2013-11-27 | 滨州市东润机械有限公司 | Ion nitriding furnace |
| CN203320111U (en) * | 2013-07-11 | 2013-12-04 | 滨州市东润机械有限公司 | Nitriding furnace temperature evenly distributing device |
Non-Patent Citations (1)
| Title |
|---|
| 谭文清 等: ""船用发动机曲轴的气体氮碳共渗"", 《金属热处理》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846325A (en) * | 2015-05-14 | 2015-08-19 | 广西梧州运龙港船机械制造有限公司 | Ion nitriding tool for marine crankshaft |
| CN105603357A (en) * | 2015-12-31 | 2016-05-25 | 浙江舟山博斯特船舶设计研究院有限公司 | Ionic nitriding process for marine crankshafts |
| CN108103433A (en) * | 2017-12-14 | 2018-06-01 | 辽宁忠旺集团有限公司 | A kind of solar energy extruding die for aluminum shaped material nitrogenation treatment technology |
| CN108103433B (en) * | 2017-12-14 | 2019-11-19 | 辽宁忠旺集团有限公司 | A kind of solar energy extruding die for aluminum shaped material nitrogenation treatment technology |
| CN112712956A (en) * | 2020-12-16 | 2021-04-27 | 横店集团东磁股份有限公司 | Nitriding method of rare earth magnet and nitrided rare earth magnet |
| CN112712956B (en) * | 2020-12-16 | 2022-05-31 | 横店集团东磁股份有限公司 | Nitriding method of rare earth magnet and nitrided rare earth magnet |
| CN117230405A (en) * | 2023-10-17 | 2023-12-15 | 江苏远方动力科技有限公司 | High-frequency quenching low-temperature nitriding composite strengthening system and method for surface of crankshaft journal |
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