CN102329943A - Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft - Google Patents
Thermal treatment method for large electroslag smelting cast 42CrMo steel crankshaft Download PDFInfo
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Abstract
The invention relates to a thermal treatment method for a large electroslag smelting cast 42CrMo steel crankshaft, belonging to the technical field of thermal treatment processes for electroslag smelting cast 42CrMo steel. The invention aims at providing a thermal treatment method for a large electroslag smelting cast 42CrMo steel crankshaft, which can reduce the blank weight of raw materials, shorten the production processing period and replace the 42CrMo forged steel crankshaft. The thermal treatment method comprises the following steps of: (1) normalizing: placing the processed electroslag smelting cast 42CrMo steel crankshaft in a heating furnace, normalizing the electroslag smelting cast 42CrMo steel crankshaft at 350 DEG C, 650 DEG C, 860 DEG C and 890-920 DEG C, and adopting air cooling; (2) tempering: placing the normalized steel crankshaft in a tempering furnace, heating to 650-700 DEG C, and adopting air cooling; and (3) quenching and tempering: quenching the normalized and tempered electroslag smelting cast 42CrMo steel crankshaft at 650 DEG C and 860 DEG C in a furnace after shot blasting, adopting oil cooling, and adopting air cooling after 570 DEG C.
Description
Technical field:
The invention belongs to electroslag casting 42CrMo steel heat treatment process technical field.
Background technology:
Electroslag casting is that a kind of refining of metal and casting of making once accomplished, and produces the electroslag metallurgy technology of high duty alloy foundry goods.It is to utilize electric current to pass through the resistance heat that melt cinder produces, and constantly with the metal electrode fusing, molten metal pools and drips, and passes slag blanket and splashes into metal pool, in special-shaped water cooled mo(u)ld, is frozen into the technology of foundry goods simultaneously.Foundry goods cools off order of crystallization fast in water cooled mo(u)ld; Metal structure is fine and close, composition is even; Eliminated the anisotropy of machinery and physical properties; Macrostructure improves, and defectives such as common hairline in the general foundry goods, loose, shrinkage cavity, slag inclusion, segregation are eliminated basically, and each item performance index of foundry goods obviously are superior to common sand mold casting.Realize the method for casting and forging, can reduce the blank material cost.
At present still not about the application report of large-scale electroslag casting at 42CrMo steel crank shaft heat treating method.
The 42CrMo steel crank shaft is used on the large-scale surge pump in a large number, before this, adopts the 42CrMo steel forgings usually, and the weight of its blank material is 3 times of finished parts, and machining time is long.
Summary of the invention:
The object of the invention is to provide a kind of heat treating method that reduces raw-material blank weight, shortens the large-scale electroslag casting 42CrMo steel crank shaft of process for processing cycle and instead 42CrMo forged steel crankshaft.
The present invention adopts following process step:
1, normalizing: will place in the process furnace through the electroslag casting 42CrMo steel crank shaft after the processing, through 350 ℃, 650 ℃, 860 ℃, 890～920 ℃ normalizing treatment, insulation for some time, air cooling is adopted in normalizing;
2, tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat, insulation for some time, adopt air cooling after the tempering to 650 ℃～700 ℃;
3, modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering behind shot-peening, in stove through 650 ℃, 860 ℃ quenching and preserving heat oil cooling after for some time; Again through 570 ℃ the insulation for some time after air cooling;
1, the used soaking time of 2,3 steps needs to confirm according to workpiece weight and batch.(the sector routine techniques)
Beneficial effect of the present invention:
Large-scale electroslag casting 42CrMo Heat Treatment Of Steel and forging 42CrMo Heat Treatment Of Steel have very big difference; Reason is that electroslag casting process is different fully with the blank original structure state that forging process is obtained; Top layer after the electroslag casting and core structure have bigger difference; Surface layer grain is more tiny, and heart portion crystal grain is thicker and column crystal, the tissue after the forging are arranged is equiax crystal uniformly.For the mechanical property that makes electroslag casting 42CrMo steel reaches the mechanical property standard (JB/T6396-2006) of forging 42CrMo steel, conditioning heat treatment is crucial.In pretreated process, with making the thick column crystal of heart portion after the electroslag casting be transformed into all equiax crystal uniformly of top layer and heart portion.After same modifier treatment, the mechanical property of electroslag casting part has reached the forging standard, has realized that the electroslag casting part replaces forging.
From in February, 2007 to now, the applicant has purchased the electric slag casting crankshaft blank, produces the bent axle of 4 kinds of specifications, wherein maximum weight reaches 12.5 tons, is delivered for use surplus in the of 70, the product mechanical performance index all reaches technical requirements.Compare with forging blank, the weight of electroslag casting blank reduces by 50%, and machining allowance is little, shortens the roughing cycle 1/3, has saved blank cost and roughing cost greatly, and accumulative total is economized on the use of funds and reached more than ten million yuan.
Through after the on-the-spot practical application, the bent axle working condition is good, operates steadily, and especially under the super large load condition, crooked, phenomenon such as fracture occurs, and has reached request for utilization fully.Along with the continuous expansion that use in fields such as mine, metallurgy, petrochemical industry, electric slag casting crankshaft will have vast market prospect.
Description of drawings:
Fig. 1 is normalizing of the present invention, tempering process curve:
Fig. 2 is a hardening and tempering process curve of the present invention;
Fig. 3 is the embodiment of the invention 1 heat treatment normalizing, tempering process curve;
Fig. 4 is the embodiment of the invention 1 a heat treatment quenching and tempering process curve;
Fig. 5 is the embodiment of the invention 2 heat treatment normalizings, tempering process curve;
Fig. 6 is the embodiment of the invention 2 heat treatment quenching and tempering process curves;
Embodiment:
As shown in the figure, the present invention adopts following process step:
1, normalizing: will place in the process furnace through the electroslag casting 42CrMo steel crank shaft after the processing,, insulation for some time, adopt air cooling through 350 ℃, 650 ℃, 860 ℃, 890～920 ℃ normalizing treatment;
2, tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat, insulation for some time, adopt air cooling after the tempering to 650 ℃～700 ℃;
3, modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering behind shot-peening, in stove through 650 ℃, 860 ℃ the insulation for some time after oil cooling; Again through 570 ℃ the insulation for some time after air cooling;
1, the used soaking time of 2,3 steps needs to confirm according to workpiece weight and batch.
Embodiment 1:
Three throw crank shaft: material electroslag casting 42CrMo steel specification Φ 1060 * 3050mm net weight 5283kg1 spare heat treatment cycle curve is as shown in Figure 3:
1, normalizing: will place in the process furnace air cooling after 350 ℃ (2 hours), 650 ℃ (4 hours), 860 ℃ (6 hours), 890～920 ℃ of (4 hours) normalizing treatment through the electroslag casting 42CrMo steel crank shaft after the processing;
2, tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat to 650 ℃～700 ℃ (15 hours), back air cooling;
3, modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering behind shot-peening, in stove behind 650 ℃ (4 hours), 860 ℃ (10 hours) oil cooling; Air cooling after 570 ℃ (15 hours) again.
Embodiment 2:
Three throw crank shaft: material electroslag casting 42CrMo steel specification Φ 1070 * 2658mm net weight 5049kg1 spare heat treatment cycle curve is as shown in Figure 4:
1, normalizing: will place in the process furnace air cooling after 350 ℃ (2 hours), 650 ℃ (4 hours), 860 ℃ (6 hours), 890～920 ℃ of (2 hours) normalizing treatment through the electroslag casting 42CrMo steel crank shaft after the processing;
2, tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat to 650 ℃～700 ℃ (12 hours), back air cooling;
3, modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering behind shot-peening, in stove behind 650 ℃ (4 hours), 860 ℃ (8 hours) oil cooling; Air cooling after 570 ℃ (12 hours) again.
After the present invention carries out normalizing, tempering pretreatment to surplus the electroslag casting 42CrMo steel crank shaft 70,, carry out conventional modulation treatment more again through shot peening.Through intercepting mechanical property sample on the body of workpiece; Through detecting the standard that all reaches " large-scale alloy structure steel forgings technical qualification " JB/T6396-2006; The horizontal and vertical mechanical property difference of electroslag casting part is little, and the mechanical performance data that provides all is a lateral performance.
Large-scale alloy structure steel forgings technical qualification JB/T6396-2006 selected parts
Mechanical property after some founding bent axle thermal treatments
Claims (3)
1. the heat treating method of one kind large-scale electroslag casting 42CrMo steel crank shaft is characterized in that, adopts following process step:
(1) normalizing: will place in the process furnace through the electroslag casting 42CrMo steel crank shaft after the processing,, insulation for some time, adopt air cooling through 350 ℃, 650 ℃, 860 ℃, 890～920 ℃ normalizing treatment;
(2) tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat, insulation for some time, adopt air cooling to 650 ℃～700 ℃;
(3) modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering behind shot-peening, in stove through 650 ℃, 860 ℃ quenching and preserving heat oil cooling after for some time; Again through 570 ℃ the insulation for some time after air cooling;
(1), (2), the used soaking time of (3) step, need according to workpiece weight and batch definite.
2. according to the heat treating method of the said a kind of large-scale electroslag casting 42CrMo steel crank shaft of claim 1, it is characterized in that the specification of electroslag casting 42CrMo steel is Φ 1060 * 3050mm, net weight 5283kg, number of packages are 1, and the thermal treatment process step is:
(1) normalizing: will place in the process furnace through the electroslag casting 42CrMo steel crank shaft after the processing, through 350 ℃, 2 hours, 650 ℃, 4 hours, 860 ℃, 6 hours, 890～920 ℃, 4 hours, air cooling after the normalizing treatment;
(2) tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat to 650 ℃～700 ℃, 15 hours back air cooling;
(3) modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering is behind shot-peening, and warp is 650 ℃, 4 hours in stove, and 860 ℃, 10 hours, back oil cooling; Warp is 570 ℃, 15 hours again, back air cooling.
3. according to the heat treating method of the said a kind of large-scale electroslag casting 42CrMo steel crank shaft of claim 1, it is characterized in that the specification of electroslag casting 42CrMo steel is Φ 1070 * 2658mm, net weight 5049kg, number of packages are 1, and the thermal treatment process step is:
(1) normalizing: will place in the process furnace through the electroslag casting 42CrMo steel crank shaft after the processing, through 350 ℃, 2 hours, 650 ℃, 4 hours, 860 ℃, 6 hours, 890～920 ℃, 2 hours, air cooling after the normalizing treatment;
(2) tempering: the steel crank shaft after the normalizing is placed in the tempering stove, heat to 650 ℃～700 ℃, 12 hours back air cooling;
(3) modified: the electroslag casting 42CrMo steel crank shaft after normalizing, the tempering is behind shot-peening, and warp is 650 ℃, 4 hours in stove, and 860 ℃, 8 hours, back oil cooling; Warp is 570 ℃, 12 hours again, back air cooling.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194585A (en) * | 2013-04-13 | 2013-07-10 | 佛山市顺德区金泰德胜电机有限公司 | Manufacturing method of motor spindle of hybrid electric vehicle |
| CN104480282A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Crankshaft thermal refining method |
| CN104894356A (en) * | 2015-06-15 | 2015-09-09 | 湖州市千金宝云机械铸件有限公司 | Thermal treatment technology for tractor crankshaft |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN106391982A (en) * | 2016-08-31 | 2017-02-15 | 张家港中环海陆特锻股份有限公司 | Method for manufacturing impeller locking ring forgings for large wind turbines |
| CN107828956A (en) * | 2017-10-17 | 2018-03-23 | 九江学院 | A kind of interactive combination Technology for Heating Processing of diesel vehicle 42CrMo crankshaft forging blanks |
| CN109628711A (en) * | 2018-12-29 | 2019-04-16 | 石家庄盛华企业集团有限公司 | A kind of OM7 6E material heat treatment process |
| CN110656227A (en) * | 2019-10-10 | 2020-01-07 | 内蒙古北方重工业集团有限公司 | Hot working method for improving impact toughness of high-strength steel |
| CN113481356A (en) * | 2021-07-02 | 2021-10-08 | 重庆长征重工有限责任公司 | Method for improving coarse grains of 42CrMo alloy steel forging |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194585A (en) * | 2013-04-13 | 2013-07-10 | 佛山市顺德区金泰德胜电机有限公司 | Manufacturing method of motor spindle of hybrid electric vehicle |
| CN103194585B (en) * | 2013-04-13 | 2014-07-02 | 佛山市顺德区金泰德胜电机有限公司 | Manufacturing method of motor spindle of hybrid electric vehicle |
| CN104480282A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Crankshaft thermal refining method |
| CN104894356A (en) * | 2015-06-15 | 2015-09-09 | 湖州市千金宝云机械铸件有限公司 | Thermal treatment technology for tractor crankshaft |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN105543684B (en) * | 2015-12-23 | 2017-12-29 | 宝鼎科技股份有限公司 | Adjustable propeller blade left-right rotary base forging and manufacturing process |
| CN106391982A (en) * | 2016-08-31 | 2017-02-15 | 张家港中环海陆特锻股份有限公司 | Method for manufacturing impeller locking ring forgings for large wind turbines |
| CN107828956A (en) * | 2017-10-17 | 2018-03-23 | 九江学院 | A kind of interactive combination Technology for Heating Processing of diesel vehicle 42CrMo crankshaft forging blanks |
| CN109628711A (en) * | 2018-12-29 | 2019-04-16 | 石家庄盛华企业集团有限公司 | A kind of OM7 6E material heat treatment process |
| CN110656227A (en) * | 2019-10-10 | 2020-01-07 | 内蒙古北方重工业集团有限公司 | Hot working method for improving impact toughness of high-strength steel |
| CN113481356A (en) * | 2021-07-02 | 2021-10-08 | 重庆长征重工有限责任公司 | Method for improving coarse grains of 42CrMo alloy steel forging |
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