CN103695795A - Casting process of large-scale mining excavator part driving wheel - Google Patents
Casting process of large-scale mining excavator part driving wheel Download PDFInfo
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- CN103695795A CN103695795A CN201310613617.6A CN201310613617A CN103695795A CN 103695795 A CN103695795 A CN 103695795A CN 201310613617 A CN201310613617 A CN 201310613617A CN 103695795 A CN103695795 A CN 103695795A
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Abstract
The invention relates to a casting process of a large-scale mining excavator part driving wheel. The process is as below: smelting is carried out in an arc furnace with furnace temperature at 1550-1560 DEG C, aluminum, rare earth and silicon zirconium alloy are added for strong deoxidation, argon is blown into ladle for purification in order to remove impurities, and finally the oxygen content of the molten steel is no higher than 60 PPm. Pouring temperature is strictly controlled at 1550-1560 DEG C to ensure casting of high quality molten steel, molding sand employs a ferrochrome resin sand, furnace charge and normalization are carried out after shakeout, the normalization temperature is at 900-910 DEG C, riser removal and reconditioning finishing are conducted at no lower than 300-500 DEG C and, a sample plate is used for checking the position of lug of the driving wheel, and after roughing tempering is carried out at 550 DEG C and overall hardening and tempering is carried out at 920-930 DEG C. The process improves bending resistance, anti-torsion strength and surface contact strength of the driving wheel and prolongs the service life of the transmission parts.
Description
Technical field
The invention belongs to metal casting technical field, relate to a kind of casting technique of large-sized mining dredger parts motion-work wheel.
Background technology
Along with Open Pit Mines At Home And Abroad is production-scale, increasingly expand, mining technology and equipment and technology level improve day by day, in order further to improve economic benefit and the labour productivity of enterprise, reduce production costs, the mine excavator of larger specification has started progressively to replace the excavating equipment of small dimension, and outdoor to adopt installing standby (excavator) be irreversible megatrend to large scale development.Nearly all surface mine has all selected that performance is more perfect, state of the art is more advanced in newly-built, reconstruction and enlarging, better reliability, production efficiency are higher, be easier to care and maintenance, devices consume is lower, longer service life, price function be than more excellent large specification in use for mine excavator.The enterprise of Development and Production large-sized mining dredger mainly contains U.S. P & H company, U.S. Bucyrus company, Chinese Taiyuan Heavy Industry Co, Russian Ao Musi (OMZ) mining equiment company and Ural Heavy Machines Plant etc. in the world at present.Motion-work wheel (driving wheel) is that the major parts properties of large excavator running gear requires height, present manufacturing process all adopts casting, but casting technique and thermal treatment process are different, guarantee inner quality and various mechanical property requirement, the bad problems such as wearing and tearing or brisement that easily cause of performance.Casting technique of the present invention, adopts the auxiliary rising head of external chill to reach consecutive solidification, and mating surface medium frequency quenching has improved bending resistance, twisting strength and the Surface Contact intensity of motion-work wheel, the work-ing life of having improved driving parts.
Summary of the invention
In order to solve the problem of above-mentioned existence, invented a kind of casting technique of large-sized mining dredger parts motion-work wheel.
Technical scheme
A casting technique for large-sized mining dredger parts motion-work wheel, adopts electric arc furnace smelting, adds aluminium, rare earth and silicon-zirconium to carry out strong deoxidation, and ladle argon-blown gas purifies removes impurity, and final molten steel includes oxygen amount≤60PPm(weight ratio); The strict teeming temperature of controlling makes it to remain within the scope of 1550～1560 ℃, guarantees high-quality pouring molten steel, during cast, is incubated; Molding sand adopts ferrochrome resin sand, shove charge normalizing after knockout, normalizing temperature is 900～910 ℃, be not less than remove feeders, reconditioning finishing at 300～500 ℃ of temperature, with model, check motion-work wheel bump position, tempering at the temperature of 550 ℃ of left and right after roughing, whole modified at the temperature of 920～930 ℃.
During cast, adopt the auxiliary rising head of external chill to reach consecutive solidification, in fuse, put a certain amount of dry sand.
During cast, holding temperature is 1510-1560 ℃, and the time is 4-6 hour.
The composition of high-quality molten steel is as table 1:
Table 1: the composition of molten steel
The ladle argon-blown gas clarification time of the present invention is 2-4 minute, is blown into argon flow amount and makes molten steel face magic flower on ladle.
It is to improve motion-work wheel quality product that the present invention adopts mating surface medium frequency quenching.
The unusual effect of invention
The casting technique of large-sized mining dredger parts motion-work wheel of the present invention, has improved bending resistance, twisting strength and the Surface Contact intensity of motion-work wheel, the work-ing life of having improved driving parts.The large-sized mining dredger parts motion-work wheel of casting meets U.S. ASTM standard, tensile strength >=130Ksi, the actual 136Ksi that reaches completely by detecting foundry goods; Yield strength >=115Ksi, the actual 118Ksi that reaches; Unit elongation >=11%, actual 12%; Relative reduction in area >=25%, actual 26.5%; Hardness BHN >=320, actually reach 327.Surface MT(magnetic-particle inspection) flaw detection has reached the linear requirement that shows 2 grades of ASTME709, ASTME125, UT(UT (Ultrasonic Testing)) detecting a flaw has reached 1 grade of ASTMA609 standard critical area, the requirement of other II level.
Embodiment
Below by embodiment, further illustrate and will invent, but be not limitation of the invention further.
The Production Flow Chart of large-sized mining dredger parts motion-work wheel: moulding---cast---insulation---knockout---thermal treatment---finishing.
Embodiment 1
Adopt electric arc furnace smelting steel, with adding aluminium, rare earth and silicon-zirconium carry out strong deoxidation, final molten steel includes oxygen amount≤60PPm, molten steel face magic flower on ladle argon-blown gas ladle, maintain 2 minutes, purify and remove impurity, moulding, the strict teeming temperature of controlling makes it to remain within the scope of 1550～1560 ℃, guarantee high-quality pouring molten steel, molding sand adopts ferrochrome resin sand, 1550 ℃ of holding temperatures, 4 hours time, adopt the auxiliary rising head of external chill to reach consecutive solidification, shove charge normalizing after knockout, normalizing temperature is 900～910 ℃, be not less than remove feeders at 300～500 ℃ of temperature, reconditioning finishing, with model, check motion-work wheel bump position, tempering at the temperature of 550 ℃ of left and right after roughing, whole modified at the temperature of 920～930 ℃.
The motion-work wheel the performance test results of preparation is: meet U.S. ASTM standard completely, tensile strength is 136Ksi; Yield strength is 118Ksi; Unit elongation 12%; Relative reduction in area is 26.5%; Hardness (BHN) is 327.Surface MT(magnetic-particle inspection) flaw detection has reached the linear requirement that shows 2 grades of ASTME709, ASTME125, UT(UT (Ultrasonic Testing)) detecting a flaw has reached 1 grade of ASTMA609 standard critical area, the requirement of other II level.
Embodiment 2
Adopt electric arc furnace smelting steel, with adding aluminium, rare earth and silicon-zirconium carry out strong deoxidation, final molten steel includes oxygen amount≤60PPm, molten steel face magic flower on ladle argon-blown gas ladle, maintain 4 minutes, purify and remove impurity, moulding, the strict teeming temperature of controlling makes it to remain within the scope of 1550～1560 ℃, guarantee high-quality pouring molten steel, molding sand adopts ferrochrome resin sand, 1560 ℃ of holding temperatures, 6 hours time, adopt the auxiliary rising head of external chill to reach consecutive solidification, shove charge normalizing after knockout, normalizing temperature is 900～910 ℃, be not less than remove feeders at 300～500 ℃ of temperature, reconditioning finishing, with model, check motion-work wheel bump position, tempering at the temperature of 550 ℃ of left and right after roughing, whole modified at the temperature of 920～930 ℃.
The motion-work wheel the performance test results of preparation is: meet U.S. ASTM standard completely, tensile strength is 135Ksi; Yield strength is 118Ksi; Unit elongation 12%; Relative reduction in area is 27.5%; Hardness (BHN) is 327.Surface MT(magnetic-particle inspection) flaw detection has reached the linear requirement that shows 2 grades of ASTME709, ASTME125, UT(UT (Ultrasonic Testing)) detecting a flaw has reached 1 grade of ASTMA609 standard critical area, the requirement of other II level.
Embodiment 3
Adopt electric arc furnace smelting steel, with adding aluminium, rare earth and silicon-zirconium carry out strong deoxidation, final molten steel includes oxygen amount≤60PPm, molten steel face magic flower on ladle argon-blown gas ladle, maintain 3 minutes, purify and remove impurity, moulding, the strict teeming temperature of controlling makes it to remain within the scope of 1550～1560 ℃, guarantee high-quality pouring molten steel, molding sand adopts ferrochrome resin sand, 1550 ℃ of holding temperatures, 5 hours time, adopt the auxiliary rising head of external chill to reach consecutive solidification, shove charge normalizing after knockout, normalizing temperature is 900～910 ℃, be not less than remove feeders at 300～500 ℃ of temperature, reconditioning finishing, with model, check motion-work wheel bump position, tempering at the temperature of 550 ℃ of left and right after roughing, whole modified at the temperature of 920～930 ℃.
The motion-work wheel the performance test results of preparation is: meet U.S. ASTM standard completely, tensile strength is 140Ksi; Yield strength is 120Ksi; Unit elongation 12%; Relative reduction in area is 26.5%; Hardness (BHN) is 328.Surface MT(magnetic-particle inspection) flaw detection has reached the linear requirement that shows 2 grades of ASTME709, ASTME125, UT(UT (Ultrasonic Testing)) detecting a flaw has reached 1 grade of ASTMA609 standard critical area, the requirement of other II level.
Claims (5)
1. a casting technique for large-sized mining dredger parts motion-work wheel, adopts electric arc furnace smelting, adds aluminium, rare earth and silicon-zirconium to carry out strong deoxidation, and ladle argon-blown gas purifies removes impurity, and final molten steel includes oxygen amount≤60PPm(weight ratio); Moulding, molding sand adopts chromite resin sand, strictly controls teeming temperature and makes it to remain within the scope of 1550 ~ 1560 ℃, guarantees high-quality pouring molten steel, during cast, is incubated; Shove charge normalizing after knockout, normalizing temperature is 900 ~ 910 ℃, be not less than remove feeders at 300 ~ 500 ℃ of temperature, reconditioning finishing, with model, check motion-work wheel bump position, tempering at the temperature of 550 ℃ of left and right after roughing, whole modified at the temperature of 920 ~ 930 ℃, adopts the auxiliary rising head of external chill to reach consecutive solidification while it is characterized in that pouring into a mould, put a certain amount of dry sand in fuse.
2. according to the casting technique of claim 1, it is characterized in that molten steel element mass content is C:0.30%-0.38%, Si:0.3%-0.6%, Mn:0.5%-1.0%, Cr:1.0%-1.5%, Ni:1.3%-1.7%, Mo:0.20%-0.30%, S, P :≤0.010%.
3. according to the casting technique of the large-sized mining dredger parts motion-work wheel of claim 1, it is characterized in that it is to be blown into argon flow amount to make molten steel face magic flower on ladle that described ladle argon-blown gas purifies, the blowing argon gas clarification time is 2-4 minute.
4. according to the casting technique of the large-sized mining dredger parts motion-work wheel of claim 1, while it is characterized in that described cast, holding temperature is 1510-1560 ℃, and the time is 4-6 hour.
5. according to the casting technique of the large-sized mining dredger parts motion-work wheel of claim 1, it is characterized in that described quenching is mating surface medium frequency quenching.
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| CN201310613617.6A CN103695795B (en) | 2013-11-26 | 2013-11-26 | A kind of casting technique of large-sized mining dredger parts motion-work wheel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404191A (en) * | 2014-11-08 | 2015-03-11 | 江苏天舜金属材料集团有限公司 | Casting technology of wear-resistant low-porosity cable bridge stand |
| CN105149521A (en) * | 2015-09-11 | 2015-12-16 | 湖州中联机械制造有限公司 | Subway internal steel frame casting and production technology thereof |
| CN110408856A (en) * | 2019-09-09 | 2019-11-05 | 郑州煤机智能工作面科技有限公司 | A kind of founding materials and its casting method for coalcutter torque axis |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001150095A (en) * | 1999-11-25 | 2001-06-05 | Kobe Steel Ltd | Thick and large size steel casting and mold |
| CN101003084A (en) * | 2007-01-09 | 2007-07-25 | 辽宁福鞍铸业集团有限公司 | Production of large and super-critical steel-casting by using alkali phenolic aldehyde resin art |
| CN101857940A (en) * | 2010-06-23 | 2010-10-13 | 抚顺泰平铸造有限公司 | ZG35MnMo steel ball |
| CN102990014A (en) * | 2012-12-17 | 2013-03-27 | 莱芜市大众机械制造有限公司 | Casting method of engineering machine driving wheel |
-
2013
- 2013-11-26 CN CN201310613617.6A patent/CN103695795B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001150095A (en) * | 1999-11-25 | 2001-06-05 | Kobe Steel Ltd | Thick and large size steel casting and mold |
| CN101003084A (en) * | 2007-01-09 | 2007-07-25 | 辽宁福鞍铸业集团有限公司 | Production of large and super-critical steel-casting by using alkali phenolic aldehyde resin art |
| CN101857940A (en) * | 2010-06-23 | 2010-10-13 | 抚顺泰平铸造有限公司 | ZG35MnMo steel ball |
| CN102990014A (en) * | 2012-12-17 | 2013-03-27 | 莱芜市大众机械制造有限公司 | Casting method of engineering machine driving wheel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404191A (en) * | 2014-11-08 | 2015-03-11 | 江苏天舜金属材料集团有限公司 | Casting technology of wear-resistant low-porosity cable bridge stand |
| CN105149521A (en) * | 2015-09-11 | 2015-12-16 | 湖州中联机械制造有限公司 | Subway internal steel frame casting and production technology thereof |
| CN105149521B (en) * | 2015-09-11 | 2017-10-17 | 湖州中联机械制造有限公司 | Steelframe casting and its production technology in a kind of subway |
| CN110408856A (en) * | 2019-09-09 | 2019-11-05 | 郑州煤机智能工作面科技有限公司 | A kind of founding materials and its casting method for coalcutter torque axis |
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| CN103695795B (en) | 2016-04-20 |
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Inventor after: Chen Guoxiang Inventor after: Li Dong Inventor after: Yu Dongdong Inventor after: Tu Jianjun Inventor after: Dai Chao Inventor after: Li Xiuqing Inventor before: Chen Guoxiang Inventor before: Zhang Yintao Inventor before: Wang Jianguo Inventor before: Tu Jianjun Inventor before: Dai Chao Inventor before: Li Xiuqing |
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