CN104195448A - Alloy material for casting and technology of casting large gearbox casting of offshore platform by using alloy material - Google Patents
Alloy material for casting and technology of casting large gearbox casting of offshore platform by using alloy material Download PDFInfo
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- CN104195448A CN104195448A CN201410416329.6A CN201410416329A CN104195448A CN 104195448 A CN104195448 A CN 104195448A CN 201410416329 A CN201410416329 A CN 201410416329A CN 104195448 A CN104195448 A CN 104195448A
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Abstract
The invention discloses an alloy material for casting and a technology of casting a large gearbox casting of an offshore platform by using the alloy material. The alloy material is ZG32CrNiMo. The technology of casting the large gearbox casting of the offshore platform by using the ZG32CrNiMo comprises the following steps: a, resin sand modeling; b, gating system, riser and chill block arrangement; c, liquid metal gating; d, normalizing and tempering pretreatment; and e, quenching and tempering thermal treatment. Due to the adoption of the mode, the formula of the ZG32CrNiMo alloy material is reasonable; particularly, the smelted liquid metal has the characteristic of good mobility, so that the casting in a casting state has good tensile strength and good ductility; meanwhile, the technology of casting a casting of a large-size bearing shell by using the ZG32CrNiMo is reasonable; by reasonably arranging a bottom gating type gating system, a riser and a chill block, the gated casting does not have a crack and is high in the yield.
Description
Technical field
The present invention relates to metal casting technical field, particularly relate to a kind of Ajax alloy material and cast the technique of ocean platform canine tooth roller box foundry goods with it.
Background technology
The shrinking percentage of Shell-Class foundry goods is subject to the chemical composition of impact, especially molten metal of the own constitutional features of chemical composition, teeming temperature, foundry goods, the deformability of casting mold and the many factors such as deformability in loam core of the molten metal that cast alloy materials melting forms, the impact of teeming temperature makes to water to such an extent that same foundry goods is all variant in the size of the even same heat of each heat.
The ocean platform canine tooth roller box foundry goods 800kg that weighs, requirement mechanical property reaches: yield strength >=600MPa, tensile strength >=740MPa, extensibility >=17%, relative reduction in area >=35% ,-40 impact values >=34J, single minimum value 27J, hardness 210-234HBW, its Requirements of Nondestructive Testing has not allowed crackle, does not allow soldering after modified.
Structural shape more complicated due to this ocean platform canine tooth roller box, wall thickness variation is large, so that foundry goods cooling degree of each several part in castingprocesses is inhomogeneous, and very easily at wall thickness, partly produce Shinkage and dispersed porosity, in thin-walled portion, easily produce again liquid metal filling bad, therefore very easily cause the critical defects such as crackle, pore and sand holes in castingprocesses, make the percentage of A-class goods of foundry goods low; In order to eliminate casting stress, improve casting dimension accuracy and internal soundness, thermal treatment process is also very crucial simultaneously.
Summary of the invention
The technical problem that the present invention mainly solves is: for the deficiencies in the prior art, a kind of Ajax alloy material is provided and casts the technique of ocean platform canine tooth roller box foundry goods with it, this alloy material formula is reasonable, the feature with good fluidity, make the foundry goods of as cast condition there is good tensile strength and good ductility, the technique of simultaneously casting ocean platform canine tooth roller box foundry goods with it is reasonable, by the reasonable disposition of bottom gating, rising head and chill, the foundry goods flawless that cast is formed, yield rate is high.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of Ajax alloy material is provided, casting for massive casting, described alloy material is ZG32CrNiMo, its composition and quality proportioning are: C:0.26-0.35%, Si:0.20-0.40%, Mn:0.90-1.10%, Cr:0.50-0.80%, Ni:0.70-0.90%, Mo:0.30-0.40%, P≤0.025%, S≤0.020%, all the other are Fe.
With described ZG32CrNiMo casting ocean platform canine tooth roller box foundry goods, its casting and thermal treatment process comprise the steps:
A, phenolic sand molding: the Flange Plane of described ocean platform canine tooth roller box foundry goods of take is joint face, with phenolic sand molding, forms respectively upper and lower involutory upper impression resin sand mould and lower impressions resin sand mould;
B, gating system, rising head and chill are set: described gating system is bottom gating, comprises sprue cup, sprue, cross gate and the 2 road ingates of mutual perforation, and the diameter of described sprue, cross gate, 2 road ingates is 60mm; In the Flange Plane of the described ocean platform canine tooth roller box foundry goods of described upper impression resin sand mould, open top is set, described open top has 3, comprise 2 cylindrical open tops and 1 oval cylindricality open top, the structure of wherein said 2 cylindrical open tops is identical, size equates; Thermal center place at the described ocean platform canine tooth roller box foundry goods of described lower impressions resin sand mould arranges contoured chill, and described contoured chill has 2, the symmetrical described thermal center place that is placed on;
C, casting of molten metal: pour into a mould the molten metal that described ZG32CrNiMo melting forms, orifice diameter is 45mm, in casting process, teeming temperature is 1550 ± 10 ℃, water molten metal described in heavy 1200kg, after casting complete, obtain described ocean platform canine tooth roller box foundry goods, foundry goods is incubated to 48 hours in sand mold, then sand removal gas cutting open top;
D, normalizing+tempering pretreatment: described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, normalizing is warming up to 620 ± 10 ℃, be incubated 2 hours, continue normalizing and be warming up to 900 ± 10 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, and tempering is warming up to 620 ± 10 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
E: modified thermal treatment: pretreated described ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then foundry goods is put into normalizing furnace, be warming up to 880 ± 10 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 650 ± 10 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
In a preferred embodiment of the present invention, described 2 cylindrical open tops are of a size of: Φ 200mm * 300mm, described 1 oval cylindricality open top is of a size of waist 200mm * 300mm.According to the structure of ocean platform canine tooth roller box foundry goods and the big or small open top that Sizes is set, make the liquid state that has enough molten metals to supplement foundry goods in open top shrink and solidify the volume of feeding and the rear die cavity expansion of cast.
In a preferred embodiment of the present invention, in described casting process, when metal bath surface rises to the 1/2-2/3 of described open top height, in described each open top, add heat preserving agent, each open top adds heat preserving agent 2kg.For extending open top molten metal, keep the liquid time, improve the feeding efficiency of open top, and can save molten metal consumption, reduction casting cost.
In a preferred embodiment of the present invention, described gas cutting open top temperature is not less than 150 ℃.In order to avoid produce open top root stress raisers, cause casting crack phenomenon.
In a preferred embodiment of the present invention, described quenching adopts shrend mode.Cost is low, need strengthen the circulation of water during quenching, is convenient to cooling even.
In a preferred embodiment of the present invention, heat-up rate≤100 ℃/h of described normalizing, tempering.Control heat-up rate, can improve thermal effectiveness, eliminate casting stress, the stable dimensions of foundry goods and improve the mechanical property of foundry goods.
The invention has the beneficial effects as follows: the ZG32CrNiMo Ajax alloy material that the present invention fills a prescription voluntarily, rationally, the molten metal being formed by this material melting has the feature of good fluidity to formula, makes the foundry goods of as cast condition have good tensile strength and good ductility; The technique of simultaneously casting ocean platform canine tooth roller box foundry goods with it is reasonable, by the reasonable disposition of bottom gating, rising head and chill, and the foundry goods flawless that cast is formed, yield rate is high; In addition after casting, foundry goods, through normalizing, tempering pretreatment and modified thermal treatment, can be eliminated casting stress, improves casting dimension accuracy and inner quality.
Accompanying drawing explanation
Fig. 1 casts the main TV structure schematic diagram of technique of ocean platform canine tooth roller box foundry goods with ZG32CrNiMo;
Fig. 2 is the schematic diagram of plan structure shown in Fig. 1;
In accompanying drawing, the mark of each parts is as follows: 1, Flange Plane, 2, open top, 3, contoured chill, 4, sprue cup, 5, sprue, 6, cross gate, 7, ingate.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
Refer to Fig. 1 and Fig. 2, the embodiment of the present invention comprises:
A kind of Ajax alloy material, casting for massive casting, described alloy material is ZG32CrNiMo, its composition and quality proportioning are:: C:0.26-0.35%, Si:0.20-0.40%, Mn:0.90-1.10%, Cr:0.50-0.80%, Ni:0.70-0.90%, Mo:0.30-0.40%, P≤0.025%, S≤0.020%, all the other are Fe.The molten metal that this alloy material melting forms has the feature of good fluidity, makes the foundry goods of as cast condition have good tensile strength and ductility.
With described ZG32CrNiMo casting ocean platform canine tooth roller box foundry goods, its casting and thermal treatment process comprise the steps:
A, phenolic sand molding: the Flange Plane 1 of described ocean platform canine tooth roller box foundry goods of take is joint face, with phenolic sand molding, forms respectively upper and lower involutory upper impression resin sand mould and lower impressions resin sand mould;
B, gating system, rising head and chill are set: described gating system is bottom gating, comprises sprue cup 4, sprue 5, cross gate 6 and the 2 road ingates 7 of mutual perforation, and the diameter of described sprue 5, cross gate 6,2 road ingates 7 is 60mm; In the Flange Plane 1 of the described ocean platform canine tooth roller box foundry goods of described upper impression resin sand mould, open top 2 is set, described open top 2 has 3, comprises that 2 are of a size of: the cylindrical open top of Φ 200mm * 300mm and 1 are of a size of: the oval cylindricality open top of waist 200mm * 300mm; Thermal center place at the described ocean platform canine tooth roller box foundry goods of described lower impressions resin sand mould arranges contoured chill 3, and described contoured chill 3 has 2, and its thickness is 50mm, the symmetrical described thermal center place that is placed on; By bottom gating, open top 2 and contoured chill 3 reasonable coordinations, control the order that solidifies of foundry goods, crystal grain thinning tissue, prevents that crackle from appearring in foundry goods;
C, casting of molten metal: pour into a mould the molten metal that described ZG32CrNiMo melting forms, orifice diameter is 45mm, in casting process, teeming temperature is 1550 ± 10 ℃, water molten metal described in heavy 1200kg, after casting complete, obtain described ocean platform canine tooth roller box foundry goods, foundry goods is incubated to 48 hours in sand mold, then sand removal gas cutting open top 2, and the temperature of air bound open top 2 is not less than 150 ℃, in order to avoid produce open top 2 root stress raisers, cause casting crack phenomenon;
Wherein, in described casting process, when metal bath surface rises to the 1/2-2/3 of described open top 2 height, in described each open top 2, add heat preserving agent, each open top 2 adds heat preserving agent 2kg.For extending open top 2 molten metals, keep the liquid time, improve the feeding efficiency of open top 2, and can save molten metal consumption, reduction casting cost;
D, normalizing+tempering pretreatment: described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, normalizing is warming up to 620 ± 10 ℃, be incubated 2 hours, continue normalizing and be warming up to 900 ± 10 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, and tempering is warming up to 620 ± 10 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
E: modified thermal treatment: pretreated described ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then foundry goods is put into normalizing furnace, be warming up to 880 ± 10 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 650 ± 10 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
Wherein, described quenching adopts shrend mode, and cost is low, need strengthen the circulation of water during quenching, is convenient to cooling even.
Heat-up rate≤100 ℃/h of described normalizing, tempering, control heat-up rate, can improve thermal effectiveness, eliminate casting stress, the stable dimensions of foundry goods and improve the mechanical property of foundry goods.
Embodiment mono-:
Preparation is for casting the ZG32CrNiMo alloy material of ocean platform canine tooth roller box foundry goods, and its composition and quality proportioning are: C:0.26%, Si:0.40%, Mn:0.90%, Cr:0.50%, Ni:0.80%, Mo:0.30%, P:0.015%, S:0.02%, Fe:96.805%.
With above-mentioned formulated ZG32CrNiMo alloy material casting ocean platform canine tooth roller box foundry goods, its casting and thermal treatment process comprise the steps:
A, the ZG32CrNiMo alloy material that above-mentioned preparation is obtained are smelted into molten metal;
B, carry out phenolic sand molding as stated above, bottom gating, open top and contoured chill are set, cast 1200kg molten metal, teeming temperature is 1550 ℃, after casting complete, foundry goods is incubated 48 hours in sand mold, then sand removal gas cutting open top, the temperature of gas cutting open top is 150 ℃, the ocean platform canine tooth roller box foundry goods gross weight 800kg that cast forms;
C, the above-mentioned ocean platform canine tooth roller box foundry goods making is put into normalizing furnace, normalizing is warming up to 620 ℃, is incubated 2 hours, continue normalizing and be warming up to 890 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, tempering is warming up to 610 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
D, above-mentioned pretreated ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, be warming up to 870 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 640 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
Embodiment bis-:
Preparation is for casting the ZG32CrNiMo alloy material of ocean platform canine tooth roller box foundry goods, and its composition and quality proportioning are: C:0.35%, Si:0.20%, Mn:1.00%, Cr:0.80%, Ni:0.70%, Mo:0.38%, P:0.01%, S:0.01%, Fe:96.55%.
With above-mentioned formulated ZG32CrNiMo alloy material casting ocean platform canine tooth roller box foundry goods, its casting and thermal treatment process comprise the steps:
A, the ZG32CrNiMo alloy material that above-mentioned preparation is obtained are smelted into molten metal;
B, carry out phenolic sand molding as stated above, bottom gating, open top and contoured chill are set, cast 1200kg molten metal, teeming temperature is 1540 ℃, after casting complete, foundry goods is incubated 48 hours in sand mold, then sand removal gas cutting open top, the temperature of gas cutting open top is 160 ℃, the ocean platform canine tooth roller box foundry goods gross weight 800kg that cast forms;
C, the above-mentioned ocean platform canine tooth roller box foundry goods making is put into normalizing furnace, normalizing is warming up to 610 ℃, is incubated 2 hours, continue normalizing and be warming up to 900 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, tempering is warming up to 620 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
D, above-mentioned pretreated ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, be warming up to 880 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 660 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
Embodiment tri-:
Preparation is for casting the ZG32CrNiMo alloy material of ocean platform canine tooth roller box foundry goods, and its composition and quality proportioning are: C:0.32%, Si:0.40%, Mn:0.90%, Cr:0.70%, Ni:0.70%, Mo:0.34%, P:0.025%, S:0.01%, Fe:96.605%.
With above-mentioned formulated ZG32CrNiMo alloy material casting ocean platform canine tooth roller box foundry goods, its casting and thermal treatment process comprise the steps:
A, the ZG32CrNiMo alloy material that above-mentioned preparation is obtained are smelted into molten metal;
B, carry out phenolic sand molding as stated above, bottom gating, open top and contoured chill are set, cast 1200kg molten metal, teeming temperature is 1560 ℃, after casting complete, foundry goods is incubated 48 hours in sand mold, then sand removal gas cutting open top, the temperature of gas cutting open top is 160 ℃, the ocean platform canine tooth roller box foundry goods gross weight 800kg that cast forms;
C, the above-mentioned ocean platform canine tooth roller box foundry goods making is put into normalizing furnace, normalizing is warming up to 630 ℃, is incubated 2 hours, continue normalizing and be warming up to 910 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, tempering is warming up to 630 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
D, above-mentioned pretreated ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, be warming up to 890 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 650 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
The present invention has disclosed a kind of Ajax alloy material, for the ZG32CrNiMo alloy material of filling a prescription voluntarily, rationally, the molten metal being formed by this material melting has the feature of good fluidity to its formula, makes the foundry goods of as cast condition have good tensile strength and good ductility; Disclosed the technique of casting ocean platform canine tooth roller box foundry goods with it simultaneously, this technique advantages of simple, by the reasonable disposition of bottom gating, rising head and chill, the foundry goods flawless that cast is formed, yield rate is high; In addition after casting, foundry goods, through normalizing, tempering pretreatment and modified thermal treatment, can be eliminated casting stress, improves casting dimension accuracy and inner quality.
The ocean platform canine tooth roller box foundry goods mechanical property that casting forms meets: yield strength >=600MPa, tensile strength >=740MPa, extensibility >=17%, relative reduction in area >=35% ,-40 impact values >=34J, single minimum value 27J, hardness 210-234HBW;
This ocean platform canine tooth roller box foundry goods nondestructive testing meets: 100%MT flaw detection, flawless; 100%UT, meets 2 grades of requirements of GB/T 7233.1-2009.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification sheets of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. an Ajax alloy material, casting for massive casting, it is characterized in that, described alloy material is ZG32CrNiMo, its composition and quality proportioning are: C:0.26-0.35%, Si:0.20-0.40%, Mn:0.90-1.10%, Cr:0.50-0.80%, Ni:0.70-0.90%, Mo:0.30-0.40%, P≤0.025%, S≤0.020%, all the other are Fe.
2. with ZG32CrNiMo, cast a technique for ocean platform canine tooth roller box foundry goods, it is characterized in that, comprise casting technique and thermal treatment process, its procedure of processing is as follows:
A, phenolic sand molding: the Flange Plane of described ocean platform canine tooth roller box foundry goods of take is joint face, with phenolic sand molding, forms respectively upper and lower involutory upper impression resin sand mould and lower impressions resin sand mould;
B, gating system, rising head and chill are set: described gating system is bottom gating, comprises sprue cup, sprue, cross gate and the 2 road ingates of mutual perforation, and the diameter of described sprue, cross gate, 2 road ingates is 60mm; In the Flange Plane of the described ocean platform canine tooth roller box foundry goods of described upper impression resin sand mould, open top is set, described open top has 3, comprise 2 cylindrical open tops and 1 oval cylindricality open top, the structure of wherein said 2 cylindrical open tops is identical, size equates; Thermal center place at the described ocean platform canine tooth roller box foundry goods of described lower impressions resin sand mould arranges contoured chill, and described contoured chill has 2, the symmetrical described thermal center place that is placed on;
C, casting of molten metal: pour into a mould the molten metal that described ZG32CrNiMo melting forms, orifice diameter is 45mm, in casting process, teeming temperature is 1550 ± 10 ℃, water molten metal described in heavy 1200kg, after casting complete, obtain described ocean platform canine tooth roller box foundry goods, foundry goods is incubated to 48 hours in sand mold, then sand removal gas cutting open top;
D, normalizing+tempering pretreatment: described ocean platform canine tooth roller box foundry goods is put into normalizing furnace, normalizing is warming up to 620 ± 10 ℃, be incubated 2 hours, continue normalizing and be warming up to 900 ± 10 ℃, be incubated 4 hours, air cooling is put into tempering stove to room temperature, and tempering is warming up to 620 ± 10 ℃, and stove is chilled to 500 ℃ and comes out of the stove;
E: modified thermal treatment: pretreated described ocean platform canine tooth roller box foundry goods is carried out to preliminary working, then foundry goods is put into normalizing furnace, be warming up to 880 ± 10 ℃, be incubated 6 hours, put into tempering stove after quenching, tempering is warming up to 650 ± 10 ℃, be incubated 8 hours, stove is chilled to 550 ℃ and comes out of the stove.
3. technique of casting ocean platform canine tooth roller box foundry goods with ZG32CrNiMo according to claim 2, it is characterized in that, described 2 cylindrical open tops are of a size of: Φ 200mm * 300mm, described 1 oval cylindricality open top is of a size of: waist 200mm * 300mm.
4. technique of casting ocean platform canine tooth roller box foundry goods with ZG32CrNiMo according to claim 2, it is characterized in that, in described casting process, when metal bath surface rises to the 1/2-2/3 of described open top height, in described open top, add heat preserving agent, each open top adds heat preserving agent 2kg.
5. technique of casting ocean platform canine tooth roller box foundry goods with ZG32CrNiMo according to claim 2, is characterized in that, described gas cutting open top temperature is not less than 150 ℃.
6. technique of casting ocean platform canine tooth roller box foundry goods with ZG32CrNiMo according to claim 2, is characterized in that, described quenching adopts shrend mode.
7. technique of casting ocean platform canine tooth roller box foundry goods with ZG32CrNiMo according to claim 2, is characterized in that heat-up rate≤100 ℃/h of described normalizing, tempering.
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| CN105154781A (en) * | 2015-08-31 | 2015-12-16 | 苏州金业船用机械厂 | Alloy material for casting marine engine cylinders |
| CN105149522A (en) * | 2015-08-31 | 2015-12-16 | 苏州金业船用机械厂 | Process for casting marine engine cylinders |
| CN107457368A (en) * | 2017-07-24 | 2017-12-12 | 绍兴市振杨机械有限公司 | A kind of casting mould of thin-walled impeller |
| CN110202094A (en) * | 2019-06-13 | 2019-09-06 | 洛阳洛北重工机械有限公司 | A kind of casting method of large-duty loader swing arm seat beam |
| CN110270661A (en) * | 2019-07-23 | 2019-09-24 | 常熟市虹桥铸钢有限公司 | The casting method of part all-direction propeller gear-box peculiar to vessel |
| CN110653340A (en) * | 2018-06-29 | 2020-01-07 | 宝山钢铁股份有限公司 | Manufacturing method of external block steel casting of width fixing machine |
| CN112605340A (en) * | 2020-12-16 | 2021-04-06 | 中车戚墅堰机车车辆工艺研究所有限公司 | Nodular cast iron integral low-floor light rail gear box and casting method thereof |
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| CN110653340A (en) * | 2018-06-29 | 2020-01-07 | 宝山钢铁股份有限公司 | Manufacturing method of external block steel casting of width fixing machine |
| CN110202094A (en) * | 2019-06-13 | 2019-09-06 | 洛阳洛北重工机械有限公司 | A kind of casting method of large-duty loader swing arm seat beam |
| CN110270661A (en) * | 2019-07-23 | 2019-09-24 | 常熟市虹桥铸钢有限公司 | The casting method of part all-direction propeller gear-box peculiar to vessel |
| CN112605340A (en) * | 2020-12-16 | 2021-04-06 | 中车戚墅堰机车车辆工艺研究所有限公司 | Nodular cast iron integral low-floor light rail gear box and casting method thereof |
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